TITLE OF THE INVENTION
BRIQUETTES, METHOD FOR PRODUCING SAME. AND APPARATUS FOR
PRODUCING SAME
5 CROSS-REFERENCE TO RELATED APPLICATION
This application claims priority to and the benefit of Korean Patent
Application No. 10-2014-0186548 and 10-2013-016462 filed in the Korean
Intellectual Property Office on December 22, 2014 and December 26, 2013, the
entire contents of which are incorporated herein by reference.
10
BACKGROUND OF THE INVENTION
(a) Field of the Invention
The present invention relates coal briquettes, a method for
manufacturing the same, and an apparatus for the same. More particularly,
15 the present invention relates to coal briquettes of which cold strength and hot
strength are improved while saving manufacturing cost, a method for
manufacturing the same, and an apparatus using the same.
(b) Description of the Related Art
In a reduced iron smelting process, iron ore is used in a reduction
20 furnace and a melter gasifier furnace that smelts reduced iron ore. When
smelting iron ore in the melter gasifier furnace, coal briquettes as a heat source
to smelt the iron ore are charged to the melter gasifier furnace. After reduced
iron is smelted in the melter gasifier furnace, the reduced iron is converted to
molten iron and slag and is discharged to the outside. The coal briquettes that
1
are charged to the melter gasifier furnace form a coal packed bed. Oxygen is
injected through a tuyere that is installed in the melter gasifier furnace such that
the coal packed bed is burned to generate a combustion gas. The combustion
gas is converted to a reduction gas of a high temperature while moving upward
5 through the coal packed bed. The reduction gas of a high temperature is
discharged to the outside of the melter gasifier furnace to be supplied to a
reduction furnace as a reduction gas.
In general, coal briquettes are manufactured by mixing coal and a binder.
In this case, molasses is used as a binder. The components of the molasses
l o vary depending on where it is sourced, and it is difficult to consistently control
the ingredients according to a sugar manufacturing process. Therefore, in the
case where a coal briquette is prepared by using molasses as a binder, it is
difficult to control the quality of the coal briquette. Particularly, in the.case of
using high moisture molasses, there are problems in that the quality of the coal
15 briquette is reduced.
The above information disclosed in this Background section is only for
enhancement of understanding of the background of the invention and therefore
it may contain information that does not form the prior art that is already known
in this country to a person of ordinary skill in the art.
20 SUMMARY OF THE INVENTION
The present invention has been made in an effort to provide coal
briquettes of which cold strength and hot strength are improved by using a raw
sugar binder and molasses together and that can save manufacturing cost. In
addition, a method for manufacturing the coal briquettes is provided. Further,
2
an apparatus for manufacturing the coal briquettes is provided.
According to an exemplary embodiment of the present invention, a
method for manufacturing coal briquettes by using a molten iron manufacturing
apparatus that includes a melter-gasifier into which reduced iron is charged and
5 a reducing furnace connected with the melter-gasifier and providing the reduced
iron, wherein the coal briquettes are charged into a dome portion of the meltergasifier
and then quickly heated is provided. The method includes: i) providing
pulverized coal; ii) providing molasses; iii) providing a raw sugar binder; iv)
providing a mixture made by adding the molasses and the raw sugar to the
lo pulverized coal; and v) providing coal briquettes by shaping the mixture.
In the providing the raw sugar binder, the raw sugar binder may be
provided as a raw sugar solution, and the raw sugar solution may include raw
sugar at about 35 wt% to about 85 wt%. In further detail, the raw sugar
solution may include raw sugar at about 65 wt% to about 85 wt%.
15 The method for manufacturing the coal briquettes according to the
exemplary embodiment of the present invention may further include adding a
hardener to the pulverized coal before providing the molasses,
In the providing the mixture, the molasses and the raw sugar binder may
be individually added to the pulverized coal. The method for manufacturing the
20 coal briquettes according to the exemplary embodiment of the present invention
may further include adding a hardener to the pulverized coal before providing
the molasses. In the providing the mixture, the molasses and the raw sugar
binder may be pre-mixed and then added to the pulverized coal. The raw
sugar may be transferred to the molasses and then mixed with the molasses
3
such that a raw sugar solution, which is the raw sugar binder, may be
manufactured, and then the raw sugar solution may be added to the pulverized
coal. When the hardener is added to the pulverized coal, the hardener may be
at least one selected from a group consisting of quicklime, slaked lime, calcium
5 carbonate, cement, bentonite, clay, silica, dolomite, phosphoric acid, and
sulfuric acid.
The providing the raw sugar binder may include: i) providing a melted
solution by melting raw sugar with steam at about 70 "C to about 120 "C; and ii)
providing the raw sugar binder by adding water to the melted solution and
lo agitating the water-added raw sugar binder at a temperature of about 60 "C to
about 70 "C. The providing the raw sugar binder may further include adjusting
a concentration of the raw sugar solution by adding water to the raw sugar
solution. The providing the raw sugar binder may include: i) crushing
sugarcane while injecting water; ii) providing sugarcane juice by juicing the
15 crushed sugarcane; and iii) providing sugarcane syrup by removing impurities
from the sugarcane juice and concentrating the sugarcane juice. The
sugarcane syrup may be provided as the raw sugar binder. In the providing
the sugarcane juice, the amount of solid content included in the sugarcane juice
may be about 10 wt% to about 30 wt%. In the providing the sugarcane syrup,
20 the amount of solid content included in the sugarcane syrup may be about 50 wt%
to about 80 wt%.
The reducing furnace may be a fluidized bed reduction furnace or a
packed bed reduction furnace. In the providing the coal briquettes, the amount
of raw sugar binder may be about 3 wt% to about 10 wt% of the coal briquettes.
4
More preferably, the amount of raw sugar binder may be about 3 wt% to about
5 wt%. The amount of molasses may be about 5 wtOh to about 15 wt% of the
mixture, and the amount of raw sugar binder may be less than the amount of
molasses..
5 In the providing the raw sugar binder, the raw sugar binder may include
sucrose, and the amount of sucrose may be about 2 wt% to about 5 wtOh with
respect to 100 wt% of pulverized coal. In the providing of the raw sugar binder,
the raw sugar binder may incude glucose, and the amount of glucose may be
about 2 wt% to about 4 wt% with respect to 100 wt% of pulverized coal. In the
lo providing the raw sugar binder, the raw sugar binder may include fructose, and
the amount of fructose may be about 2 wt% to about 4 wt% with respect to 100
wt% of pulverized coal. The hardener may be at least one selected from a
group consisting of quicklime, slaked lime, calcium carbonate, cement,
bentonite, clay, silica, dolomite, phosphoric acid, and sulfuric acid, and the
15 amount of hardener is about 1 wt% to about 5 wt% with respect to 100 wt% of
the pulverized coal.
According to another exemplary embodiment of the present invention,
coal briquettes manufactured in a molten manufacturing apparatus that includes:
i) a melter-gasifier into which reduced iron is charged; and ii) a reducing furnace
20 connected with the melter-gasifier and providing the reduced iron, and that are
charged into a dome portion of the melter-gasifier and then quickly heated, is
provided. The coal briquettes include pulverized coal, molasses, a raw sugar
binder, and a hardener, when the raw sugar binder includes sucrose, the
amount of sucrose may be about 1.35 wt% about to 9 wt% with respect to 100
5
wt% of pulverized coal. Preferably, the amount of sucrose may be about 2.7
wtOh to about 9 wt%. More preferably, the amount of sucrose may be about
3.6 wt% to about 9 wt%.
A coal briquette manufacturing apparatus according to another
5 exemplary embodiment of the present invention includes: i) at least one raw
sugar solution storage bin applied to store a raw sugar solution; ii) pulverized
coal storage bin applied to store pulverized coal; iii) a molasses storage bin
applied to store molasses; iv) a mixer connected with each of the raw sugar
solution storage bin, the pulverized coal storage bin, and the molasses storage
lo bin to receive the raw sugar solution, the pulverized coal, and the molasses to
manufacture a mixture; and v) a pair of rollers connected with the mixer,
receiving the mixture, and compressing the mixture.
The raw sugar solution storage bin may include: i) a casing; ii) a transfer
screw provided in the casing and extended in a length direction of the raw sugar
15 solution storage bin; and iii) a steam supply pipe connected with the casing and
supplying steam into the casing therethrough. The coal briquette
manufacturing apparatus according to the other exemplary embodiment of the
present invention includes: i) a raw sugar storage bin supplying raw sugar; and
ii) a pre-mixer connecting the raw sugar storage bin and the raw sugar solution
20 storage bin, and transferring the raw sugar while pre-agitating the same.
The pre-mixer may extend in a horizontal direction. The at least one
raw sugar storage bin may include a pair of raw sugar solution storage bins that
are provided at a distance from each other, and the pre-mixer may be
connected with the pair of raw sugar solution storage bins. The coal briquette
6
manufacturing apparatus may further include a raw sugar concentration
adjuster connected with the raw sugar solution storage bin and provided with a
water supply line.
A coal briquette manufacturing apparatus according to another
5 exemplary embodiment of the present invention includes: i) a raw sugar storage
bin applied to store raw sugar; ii) a molasses storage bin storing molasses,
connected with the raw sugar storage bin to receive the raw sugar therefrom,
and provided with a heat coil to melt the molasses and the raw sugar by heating;
iii) a pulverized coal storage bin applied to store pulverized coal; iv) a mixer
lo connected with each of the pulverized coal storage bin and the molasses
storage bin and manufacturing a mixture by receiving the molasses and the
pulverized coal; and v) a pair of rollers connected with the mixer, receiving the
mixture, and compressing the mixture.
According to the present invention, when coal briquettes are
15 manufactured, a raw sugar binder is used to improve hot strength of the coal
briquettes. In addition, molasses is used together with the raw sugar binder
such that manufacturing cost of the coal briquettes can be reduced.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a schematic flowchart of a method for manufacturing coal
20 briquettes according to an exemplary embodiment of the present invention.
FIG. 2 to FIG. 5 are schematic flowcharts of an apparatus for
manufacturing coal briquettes according to first to fourth exemplary
embodiments of the present invention.
FIG. 6 is a schematic diagram of an apparatus for producing raw sugar
7
of FIG. 1.
FIG. 7 and FIG. 8 are schematic diagrams of an apparatus for
manufacturing molten iron, including the apparatus for manufacturing coal
briquettes of FIG. 2 to FIG. 5.
5 DETAILED DESCRIPTION OF THE EMBODIMENTS
Terms such as first, second, and third are used for describing various
portions, components, areas, layers, andlor sections, but the terms are not
limited thereto. The terms are used only for distinguishing any portion,
component, area, layer, or section from other portions, components, areas,
lo layers, or sections. Therefore, a first portion, component, area, layer, or
section described hereinafter may be described as a second portion,
component, area, layer, or section within the scope without deviating from the
scope of the present invention.
Technical terms used herein are only used for describing a specific
15 exemplary embodiment and are not intended to limit the present invention.
Singular forms used herein include plural forms unless phrases explicitly
represent an opposite meaning. A meaning of "comprising" used in a
specification embodies a specific characteristic, area, integer, step, operation,
element, andlor component, and does not exclude the presence or addition of
ao another characteristic, area, integer, step, operation, element, andlor
component.
Unless otherwise defined, all terms including technical terms and
scientific terms used here have the same meaning as that which may be
generally understood by a person of common skill in the art. Further, terms
8
defined in a generally used dictionary have meanings corresponding to related
technical documents and presently disclosed contents, and are not to be
construed with ideal or overly official meanings unless so defined.
It is understood that the term "raw sugar binder" used hereinafter
5 includes all materials including raw sugar. In addition, it is understood that the
raw sugar binder includes solid and liquid state materials. In further detail, the
raw sugar binder may include a raw sugar solution.
The present invention will be described more fully hereinafter with
reference to the accompanying drawings, in which exemplary embodiments of
l o the invention are shown. As those skilled in the art would realize, the
described embodiments may be modified in various different ways, all without
departing from the spirit or scope of the present invention.
FIG. 1 is a schematic flowchart of a method for manufacturing coal
briquettes according to an exemplary embodiment of the present invention.
15 The flowchart of the method for manufacturing coal briquettes of FIG. 1 is an
exemplary flowchart, and the present invention is not limited thereto. Thus, the
manufacturing method of coal briquettes can be variously modified.
As shown in FIG. 1, the method for manufacturing coal briquettes
includes: providing pulverized coal (S10); providing molasses (S20); providing
20 raw sugar molasses (S30); adding a hardener to the pulverized coal (S40);
providing a mixture of the pulverized coal, the molasses, and the raw sugar
molasses (S50); and providing coal briquettes by molding the mixture (S60).
The method may further include other steps.
First, pulverized coal is provided in S10. The pulverized coal is raw
9
coal. An amount of water mixed in the pulverized coal is maintained with 2 wt%
to 12 wt% by mixing the water in advance. When the amount of water mixed in
the pulverized coal is controlled to be in the above-stated range, pores of
pulverized coal particles are blocked. As a result, the hardener and the binder
5 mixed in the next process cannot penetrate into the pulverized coal particles but
exist at the outside thereof, and thus the binder couples pulverized coal
particles well, thereby efficiently improving cold strength of coal briquettes.
Next, molasses is provided in S20. Molasses is a black or red brown
juice remaining after extracting sugar from sugar beets or sugarcane.
lo Molasses is a final by-product of a process for producing raw sugar from
sugarcane. Coal briquettes having excellent cold strength can be
manufactured using molasses as a binder.
In step S30, a raw sugar binder is provided. The raw sugar binder is a
raw sugar solution made by dissolving raw sugar in water, and sugarcane syrup
15 may also be used as the binder. Alternatively, the raw sugar binder may
include cane sugar, grape sugar, or fruit sugar. The raw sugar solution may
include raw sugar at 35 wt% to 85 wt%. If the amount of raw sugar is too low,
cold strength and hot strength of the coal briquettes may be deteriorated. On
the contrary, when the amount of raw sugar is too high, moldability of coal
20 briquettes may be deteriorated and manufacturing cost is increased.
Therefore, the amount of raw sugar is adjusted within the above-stated range.
More preferably, the raw sugar solution may include raw sugar at 65 wt% to 85
wt%. A temperature of the raw sugar solution may be 10 "C to 80 "C. When
the temperature of the raw sugar solution is too high, raw sugar may be
10
deteriorated. On the contrary, when the temperature of the raw sugar solution
is too low, flowability of the solution may be deteriorated. Accordingly, the
temperature of the raw sugar solution is adjusted within the above-stated range.
Viscosity of the raw sugar solution may be adjusted to be within a range
r, of 1cp to 60,000 cp. When the viscosity of the raw sugar solution is too high,
the flowability of the solution is deteriorated, thereby deteriorating
manufacturing process efficiency. Therefore, the viscosity of the raw sugar
solution is preferably adjusted within the above-stated range.
In the manufacturing of coal briquettes, the raw sugar binder improves
lo cold strength through a saccharate reaction with the hardener. Thus, when the
coal briquette is manufactured by adding the raw sugar binder to the pulverized
coal, properties of the coal briquette can be improved. In addition, since the
cold strength of the coal briquette can be improved when the raw sugar binder
is used, a usage amount of molasses can be further reduced.
15 Meanwhile, the raw sugar binder includes sucrose, glucose, and
fructose. A product name of sucrose is sugar. Sucrose, which is a main
component of sugar in sugarcane juice, sugar beet juice, and acer psedusieboldianum,
is a disaccharide made from a-glucose and p-fructose joined in a
1,2 linkage, and has a molecular formula of C12H22011. Since sucrose has
20 excellent sweetness and strength, sucrose is used as a reference material in
evaluation of sweeteners. Glucose is a representative aldohexose, which is a
monosaccharide having 6 carbon atoms and an aldehyde group. Glucose is a
monosaccharide with a formula C6Hl2O6, and is a main compound of
carbohydrate metabolism and can synthesizes 38 ATPs per glucose module.
11
There are D-type and L-type optical isomers, and only the D-type isomer (Dglucose)
occurs in nature and the D-glucose is called grape sugar. Meanwhile,
sucrose is a type of 2-ketohexose, also referred to as levulose, and is
distributed as a glass type and a disaccharide type or homopolysaccharide type
5 such as levan (p2, fructan) or inulin (pl, fructan) in fruits, vegetables, and honey.
With respect to 100 parts by weight of the pulverized coal, the amount of
glucose or the amount of fructose may be 2 parts by weight to 4 parts by weight.
Meanwhile, the amount of sucrose may be 2 parts by weight to 5 parts by
weight with respect to 100 parts by weight of pulverized coal. When the
lo amount of sucrose, glucose, or fructose is too low, cold strength of the coal
briquettes may be deteriorated. In addition, when the amount of sucrose,
glucose, or fructose is too high, manufacturing cost of the coal briquettes may
be increased. Therefore, the amount of sucrose, glucose, or fructose added to
the coal briquettes is preferably adjusted within the above-stated range.
15 In S40, a hardener is added to the pulverized coal. As the hardener,
quicklime, slaked lime, calcium carbonate, cement, bentonite, clay, silica,
dolomite, phosphoric acid, sulfuric acid, and the like may be used. Preferably,
coal briquettes having excellent cold strength and hot strength can be
manufactured using CaO. The amount of hardener may be 0.1 part by weight
20 to 5 parts by weight with respect to the amount of pulverized coal. The cold
strength of coal briquettes can be significantly improved by adjusting the
amount of hardener within the above-stated range. Meanwhile, the step S40 is
included in FIG. 1, but the step S40 may be omitted as necessary.
In S50, a mixture made by adding molasses and raw sugar to the
12
pulverized coal is provided. Processing time of S50 and processing time of
S40 can be maintained to be equivalent to each other.
In S60, the mixture is shaped and thus coal briquettes are provided.
For example, the mixture is charged into between a pair of rollers that rotate in
5 opposite directions respectively such that the coal briquettes can be
manufactured. Here, the amount of raw sugar binder may be 3 parts by weight
to 10 parts by weight. More preferably, the amount of raw sugar binder may
be 3 parts by weight to 5 parts by weight with respect to the amount of coal
briquettes. When the amount of raw sugar binder is too high, manufacturing
l o cost of the coal briquettes may be increased. When the amount of raw sugar
binder is too low, hot strength and cold strength of the coal briquettes may be
deteriorated. Thus, the amount of raw sugar binder is preferably adjusted
within the above-stated range.
Meanwhile, the amount of molasses may be 5 parts by weight to 15
15 parts by weight with respect to the amount of the mixture. Since molasses can
be replaced by the raw sugar binder, the amount of raw sugar binder is
preferably smaller than the amount of molasses. When the amount of raw
sugar binder is excessive compared to the amount of molasses, moldability of
coal briquettes may be deteriorated. Thus, the amount of molasses is
20 preferably adjusted within the above-stated range.
When the raw sugar binder includes fructose, the amount of fructose
may be 1.35 parts by weight to 9 parts by weight with respect to 100 parts by
weight of pulverized coal. More preferably, the amount of fructose may be 2.7
parts by weight to 9 parts by weight. Even more preferably, the amount of
13
fructose may be 3.6 parts by weight to 9 parts by weight. When the amount of
fructose is too low, cold strength of the coal briquettes may be deteriorated.
When the amount of fructose is too high, flowability of the raw sugar binder is
deteriorated, thereby deteriorating coal briquette manufacturing process
5 efficiency. The fructose may be mixed with a hardener. The hardener is at
least one material selected from a group consisting of quicklime, slaked lime,
calcium carbonate, cement, bentonite, clay, silica, dolomite, phosphoric acid,
and sulfuric acid. The amount of hardener may be 1 part by weight to 5 parts
by weight with respect to 100 parts by weight of pulverized coal. The cold
lo strength of coal briquettes can be improved by adjusting the amount of
hardener within the above-stated range.
The coal briquette may be manufactured at a temperature between 3 "C
and 300 "C. When the coal briquette is hardened at the above-stated
temperature after being shaped, the cold strength of the coal briquette can be
is improved. The coal briquette is charged into a dome portion of a meltergasifier
to melt reduced iron charged into the melter-gasifier. The reduced iron
is melted into molten iron. A reducing furnace connected with the meltergasifier
converts iron ore to reduced iron by receiving the reduction gas
therefrom.
20 FIG. 2 schematically shows a coal briquette manufacturing apparatus
100 according to a first exemplary embodiment of the present invention. FIG.
2 exemplarily illustrates a structure of the coal briquette manufacturing
apparatus 100, but the present invention is not limited thereto. Thus, the
structure of the coal briquette manufacturing apparatus 100 can be variously
14
modified.
As shown in FIG. 2, the coal briquette manufacturing apparatus 100
includes a raw sugar storage bin 10, a pulverized coal storage bin 20, a
hardener storage bin 30, a molasses storage bin 40, a pre-mixing bin 50, a
5 mixer 60, and a pair of rollers 70. The coal briquette manufacturing apparatus
100 may further include other devices as necessary.
The raw sugar storage bin 10 stores raw sugar. Raw sugar is
conveyed to the molasses storage bin 40 that is connected with the raw sugar
storage bin 10 and then heated and melted together with molasses by heat coils
lo 401 provided in the molasses storage bin 40 while being mixed and agitated
with molasses. Thus, a raw sugar solution can be manufactured in the
molasses storage bin 40 where molasses are stored. Although it is not
illustrated in FIG. 2, a water jacket may be provided at the periphery of the
molasses storage bin 40 to indirectly heat the molasses storage bin 40.
15 The molasses storage bin 40 stores molasses. Alternatively, molasses
may be stored at the outside and then an appropriate amount of molasses may
be supplied to the molasses storage bin 30 only when coal briquettes are
manufactured. Pulverized coal stored in the pulverized coal storage bin 20 is
evenly mixed with a hardener stored in the hardener storage bin 30 in the pre-
20 mixing bin 50.
The pulverized coal mixed with the hardener in the pre-mixing bin 50 is
supplied to the mixer 60 and then mixed with molasses and the raw sugar
solution supplied from the molasses storage bin 40. Thus, a saccharate
reaction and caramelization respectively occur from the mixing of molasses and
15
the raw sugar solution with the hardener. A mixture manufactured by mixing
the pulverized coal, molasses, and the raw sugar solution is supplied to the pair
of rollers 70 connected with the mixer 60 and then compressed by the rollers 70,
and accordingly, cold strength of coal briquettes manufactured therefrom can be
5 improved. Here, only raw sugar may be used, or molasses may be mixed for
reducing cost.
FIG. 3 schematically illustrates a coal briquette manufacturing apparatus
200 according to a second exemplary embodiment of the present invention.
Since the coal briquette manufacturing apparatus 200 of FIG. 3 is similar to the
lo coal briquette manufacturing apparatus 100 of FIG. 2, like reference numerals
designate like elements in the coal briquette manufacturing apparatus 100 of
FIG. 2 and a detailed description thereof will be omitted.
As shown in FIG. 3, raw sugar stored in a raw sugar storage bin 10 is
supplied to a raw sugar solution storage bin 42 and thus a raw sugar solution is
15 manufactured in the raw sugar solution storage bin 42. For this purpose, the
raw sugar solution storage bin 42 includes a casing 421, a steam supply pipe
423, and a transfer screw 425. The casing 421 extends in a vertical direction.
The casing 421 can assure durability by being made of a steel material. The
transfer screw 425 is provided in the casing 421. The transfer screw 425
20 includes a blade that is continuously formed around a shaft extended along a
length direction of the raw sugar solution storage bin 42. A temperature of the
raw sugar solution storage bin 42 is maintained within a range between 60 "C
and 65 "C. Thus, the raw sugar solution can be effectively manufactured in the
raw sugar solution storage bin 42.
16
The transfer screw 425 mixes raw sugar charged therein from an upper
portion of the raw sugar solution storage bin 42 and steam supplied through the
steam supply pipe 421. The transfer screw 425 manufactures the raw sugar
solution through even mixing, and then transfers the raw sugar solution to a
5 lower portion of the raw sugar solution storage bin 42. Since the transfer
screw 425 and the steam are used together, raw sugar can be effectively
melted and non-uniformity due to sinking raw sugar due to gravity can be solved
With a temperature of 100 "C to 120 "C, the steam can manufacture the raw
sugar solution by melting raw sugar well, and the raw sugar is not resinified
lo from pyrolysis. Steam supply pipes 423 are distanced from each other along
the length direction of the raw sugar solution storage bin 42 and connected with
the casing 421. The steam can be uniformly supplied into the casing 421 in
the raw sugar solution storage bin 42 along the arrow direction in FIG. 3. As a
result, a raw sugar solution having uniform concentration can be manufactured
15 in the raw sugar solution storage bin 42.
The raw sugar solution manufactured in the raw sugar solution storage
bin 42 is supplied to a mixer 60. Meanwhile, molasses is supplied to the mixer
60 from a molasses storage bin 43. Apart from the raw sugar solution, the
molasses is added to pulverized coal and then mixed in the mixer 60. Storage
20 bins are separated so as to prevent contamination of binders when a single
binder is contaminated by microorganisms. Fermentation due to the
microorganisms can be prevented, thereby preventing deterioration of a
function of the binder.
FIG. 4 schematically illustrates a coal briquette manufacturing apparatus
17
300 according to a third exemplary embodiment of the present invention.
Since the coal briquette manufacturing apparatus 300 of FIG. 4 is similar to the
coal briquette manufacturing apparatus 100 of FIG. 2, like reference numerals
designate like elements in the coal briquette manufacturing apparatus 100 of
5 FIG. 2 and a detailed description thereof will be omitted.
As shown in FIG. 4, a pre-mixer 44 connects a raw sugar storage bin 10
and a raw sugar solution storage bin 42 to each other. The pre-mixer 44 is
connected with the raw sugar storage bin 10, and receives raw sugar from the
raw sugar storage bin 10 and then transfers the raw sugar while pre-agitating
lo the same. Thus, while transferring the raw sugar, the pre-mixer 44 crushes
lumped raw sugar such that uniform-sized raw sugar can be supplied. For this
purpose, the pre-mixer 44 extends in a horizontal direction.
The raw sugar solution storage bin 42 mixes the raw sugar supplied
from the pre-mixer 44 with steam sprayed along the arrow direction from steam
15 supply pipes 423 to provide a melted solution. Here, a temperature of the
steam may be 70 "C to 120 "C. When the temperature of the steam is too low,
the raw sugar cannot be easily melted. On the contrary, when the temperature
of the steam is too high, the raw sugar is overheated such that the raw sugar
storage bin 42 is deteriorated, thereby deteriorating durability. Therefore, the
20 temperature of the steam is preferably adjusted within the above-stated
temperature range.
A raw sugar solution concentration adjuster 80 receives the melted
solution from the raw sugar solution storage bin 42. The raw sugar solution
concentration adjuster 80 adds water to the melted solution through a water
18
supply line 801 provided therein, and agitates the mixture of water and melted
solution at a temperature of 60 "C to 70 "C so as to provide a raw water solution.
When the agitation temperature is too low, water and the melted solution cannot
be mixed well so that raw sugar may non-uniformly exist. In addition, when the
5 agitation temperature is too high, the raw sugar solution may be deteriorated.
Thus, the agitation temperature is adjusted within the above-stated range.
Meanwhile, the raw sugar solution concentration adjuster 80 may appropriately
adjust concentration of the raw sugar solution by adding water to the raw sugar
solution. That is, although it is not illustrated in FIG. 4, a sensor is attached to
lo the raw sugar solution concentration adjuster 80 to measure concentration of
the raw sugar solution such that water is supplied when the concentration of the
raw sugar solution is high. The manufactured raw sugar solution is supplied to
a raw sugar solution supply bin 85 and then temporarily stored therein. In
addition, the raw sugar solution is supplied to the mixer 60 and then uniformly
15 mixed with molasses and pulverized coal.
FIG. 5 schematically illustrates a coal briquette manufacturing apparatus
400 according to a fourth exemplary embodiment of the present invention.
Since the coal briquette manufacturing apparatus 400 of FIG. 5 is similar to the
coal briquette manufacturing apparatus 300 of FIG. 4, like reference numerals
20 designate like elements in the coal briquette manufacturing apparatus 300 of
FIG. 4 and a detailed description thereof will be omitted.
As shown in FIG. 5, a raw sugar solution can be manufactured by using
a pair of raw sugar solution storage bins 42a and 42b. The pair of raw sugar
solution storage bins 42a and 42b are distanced from each other, and a pre-
19
mixer 44 is connected with the pair of raw sugar solution storage bins 42a and
42b. Therefore, the amount of raw sugar solution manufactured by using the
pair of raw sugar solution storage bins 42a and 42b can be increased.
FIG. 6 schematically illustrates a raw sugar manufacturing apparatus 15
that provides raw sugar of FIG. 1. FIG. 6 exemplarily illustrates the raw sugar
manufacturing apparatus 15, and the present invention is not limited thereto.
Accordingly, the raw sugar manufacturing apparatus 15 can be variously
modified in structure.
As shown in FIG. 6, the raw sugar manufacturing apparatus 15 includes
a crusher 151, a juice extractor 152, a sugarcane juice storage bin 153, a
vacuum fan 154, an impurity remover 155, a centrifugal separator 156, a
sugarcane extractor 157, and a quicklime storage bin 159. The raw sugar
manufacturing apparatus 15 may further include other constituent elements as
necessary.
The crusher 151 has protrusions and depressions formed at the surface
thereof such that sugarcane finely charged thereinto together with water can be
crushed. Sugarcane juice is extracted from the finely crushed sugarcane in
the juice extractor 152. The sugarcane juice is stored in the sugarcane juice
storage bin 153. The sugarcane juice is manufactured by crushing the
sugarcane, but many impurities are mixed in the sugarcane during cultivation
thereof. Thus, quicklime is injected into the sugarcane juice transferred to the
impurity remover 155 from the quicklime storage bin 159 so as to manufacture
sugarcane syrup after removing the impurities in the sugarcane juice. The
sugarcane syrup may be used as a coal briquette binder by being directly used
20
or by being concentrated. The sugarcane syrup has an advantage over
molasses in pipeline transport because the sugarcane syrup has very low
viscosity. In addition, since the sugarcane syrup has excellent mixing
efficiency, a cold strength deviation of coal briquettes can be reduced by
5 uniform mixing. Further, the sugarcane syrup stably maintains the cold
strength of coal briquettes without regard to a change in coal type.
A solid content in the sugarcane syrup may be 50 wt% to 80 wt%.
More preferably, the solid content may be 65 wt% to 70 wt%. When the solid
content is too low, sufficient strength of coal briquettes cannot be assured and
lo breeding of microorganisms cannot be suppressed. Particularly,
microorganisms plentifully included in the sugarcane syrup reduce sugar
components by fermenting sucrose included in the sugarcane syrup into alcohol
components so that cold strength of the coal briquettes is deteriorated. Thus,
fermentation of the sugarcane syrup due to the microorganisms needs to be
15 prevented. In addition, when the solid content is too high, transfer, storage,
and discharge of the sugarcane syrup may be difficult. Therefore, the amount
of solid contents is preferably adjusted by adjusting the amount of water and the
amount of sugarcane. For long-term storage of the sugarcane syrup for
transfer, 1 wt% or less of paraffin may be added to the sugarcane syrup.
20 Paraffin may prevent generation of foam in the sugarcane syrup due to organic
acids. That is, foam is generated when carbon dioxide in the sugarcane syrup
is discharged to the outside. When the sugarcane syrup is stirred, a container
storing the sugarcane syrup may explode due to an increase of volume or
generation of foam because of existence of an organic material, which is a
21
surfactant that generates foam. Accordingly, paraffin is used to prevent the
generation of foam.
Table 1 shows a solid content and viscosity of the solid content
according to a total amount of reducing sugar of the sugarcane syrup of which a
5 ratio of the solid content compared to the total amount of reducing sugar is
about 1:l.
(Table 1)
As shown in Table 1, when the solid content is 78 wt%, viscosity of
lo sugarcane syrup is 500 cp, which satisfies the viscosity condition of less than
25,000 cp so as to be used as a coal briquette binder. Thus, the sugarcane
syrup can be industrially used. In addition, in this case, the amount of total
reducing sugar in the sugarcane syrup is 73 wt%, which is higher than a total
amount of reducing sugar in a molasses binder, i.e., 45 wt% to 60 wt%. Thus,
15 strength of coal briquettes can be improved using sugarcane syrup having a
22
high amount of total reducing sugar. In further detail, the amount of total
reducing sugar in the sugarcane syrup is preferably 65 wt% to 90 wt%. When
the amount of the total reducing sugar is too low, the sugarcane syrup may be
fermented. Thus, for stable storage and use of the sugarcane syrup within a
5 year, quicklime or slaked lime is added to the sugarcane syrup to separate
precipitates. In addition, when the amount of total reducing sugar is too high,
viscosity of the sugarcane syrup is increased so that it cannot be applied to a
substantial process. Accordingly, the amount of total reducing sugar is
adjusted within the above-stated range.
The slaked lime used to remove the impurity shown in FIG. 6 may be
collected to be reused. Impurity-removed sugarcane juice is concentrated by
being heated in the sugarcane extractor 157 and then used as a raw sugar
binder. That is, the sugarcane syrup manufactured from the raw sugar
manufacturing apparatus 15 of FIG. 6 is directly used as a raw sugar binder so
15 as to manufacture coal briquettes. The sugarcane syrup is extracted to be
distilled and recrystallized with a vacuum fan 154 such that massecuite is
extracted therefrom. Massecuite includes raw sugar crystals and solid
contents of 90 wt% or more. In addition, raw sugar is extracted through a
centrifugal process in the centrifugal separator 156. Such a process is
20 continuously repeated in the vacuum fan 154 and the centrifugal separator 156
to extract raw sugar and discharge molasses, which is a by-product.
The amount of moisture in the raw sugar binder acquired through the
above-stated process can be easily adjusted. Thus, a type of coal having a
large amount of moisture may also be used. When the amount of moisture in
23
the sugarcane syrup is too high, strength of coal briquettes may be deteriorated
due to the excessive amount of moisture. On the contrary, when the amount
of moisture in the sugarcane syrup is too low, for example, when the amount of
moisture in the sugarcane syrup is 10 wt% or less, a transfer problem may
occur and the strength of coal briquettes may be deteriorated due to the lack of
moisture. In addition, various types of coal may be used when the raw sugar
binder is used instead of using molasses. Table 2 shows a result of
component analysis of sugarcane juice, sugarcane syrup, and raw sugar
acquired by the raw sugar manufacturing apparatus 15 of FIG. 6.
(Table 2)
NO Substance Disaccharide
I / arides
1 Sugarcane 2-20
/ juice I
2 Sugarcane 2-20
I I
As shown in Table 2, all o
Disaccharide Monosaccha
s (%) rides (%)
sucrose glucose +
sucrose
10-20
I the sugarcane juice, sugarc:
I
ne syrup, and
raw sugar acquired from the raw sugar manufacturing apparatus 15 of FIG. 6
include sucrose, glucose, and fructose. Here, sucrose is a disaccharide, and
glucose and fructose are monosaccharides. A ratio of disaccharide compared
to monosaccharide of the raw sugar is 90 or more, and the sugarcane juice and
24
the sugarcane syrup also have high ratios. On the contrary, a ratio of
disaccharide compared to monosaccharide of molasses is as low as 4 or less.
Thus, the raw sugar binder can provide coal briquettes with the same degree of
strength even through being used in a lesser amount compared to a molasses
5 binder. As a result, cost for manufacturing coal briquettes can be reduced.
That is, in order to acquire the above-stated degree of strength of the coal
briquettes, a ratio of disaccharide compared to monosaccharide is preferably 4
to 1000. More preferably, the ratio of disaccharide compared to
monosaccharide is 10 to 1000.
10 Meanwhile, since the sugarcane syrup can be produced by juicing and
concentrating sugarcane, a producing process is simple and a crystal
production process that requires expensive investment can be omitted. In
addition, a process for making a substance in a solution state can also be
omitted. That is, the entire process can be simplified, thereby improving
15 process efficiency. In addition, when a sugarcane producing area and a coal
briquette manufacturing area are close to each other, transport cost can be
saved, and since cost of sugarcane is cheaper than raw sugar, a price of the
binder can be reduced, thereby saving manufacturing cost. Further, since the
sugarcane syrup is not well-attached to a surface of the pair of rollers, shaping
20 failure can be prevented, and as viscosity of the sugarcane syrup is lower than
that of molasses, the sugarcane syrup can be uniformly coated to coal
briquettes. Meanwhile, since the sugarcane syrup has excellent adhesive
strength compared to molasses, cold strength of the coal briquettes can be
improved, and therefore deterioration of cold strength and hot strength due to
25
variation of types of coal briquettes can be prevented
FIG. 7 schematically illustrates a molten iron manufacturing apparatus
1000 including the coal briquette manufacturing apparatuses 100, 200, 300, and
400 of FIG. 2 to FIG. 5. That is, the molten iron manufacturing apparatus 1000
5 of FIG. 7 may use at least one of the coal briquette manufacturing apparatuses
100, 200, 300, and 400. A structure of the molten iron manufacturing
apparatus of FIG. 7 is an exemplarily structure, and the present invention is not
limited thereto. Therefore, the structure of the molten iron manufacturing
apparatus 1000 of FIG. 7 can be variously modified.
10 As shown in FIG. 7, the molten iron manufacturing apparatus 1000
includes a fluidized bed reducing furnace 90, a hot compacted iron
manufacturing apparatus 94, a hot compacted iron storage bin 96, the coal
briquette manufacturing apparatuses 100, 200, 300, and 400, and a meltergasifier
98. The molten iron manufacturing apparatus 1000 may include other
15 devices as necessary.
Powder-shaped iron ore is charged into the fluidized bed reducing
furnace 90 and fluidized by reduction gas while contacting the reduction gas
such that the powder-shaped iron ore is reduced. The fluidized bed reducing
furnace 90 receives the reduction gas from the melter-gasifier 98, and is
20 provided in multistages for pre-heating and sequential reduction. The coal
briquette manufacturing apparatuses 100, 200, 300, and 400 provide coal
briquettes, and the coal briquettes are charged into the melter-gasifier 98 so as
to be used as a heat source for melting reduced iron. In order to burn the coal
briquettes, oxygen is injected through a tuyere 983 such that a fire zone is
26
formed. Thus, as the tire zone is formed, molten iron can be manufactured by
melting the reduced iron, and reduction gas generated from the coal briquettes
is supplied to the fluidized bed reducing furnace 90.
Iron ore is fluidized and thus reduced in the fluidized bed reducing
5 furnace 90, and is then compressed by the hot compacted iron manufacturing
apparatus 94 such that hot compacted iron is manufactured. The hot
compacted iron is stored in the hot compacted iron storage bin 96, which also
provides an intermediate function, and then charged into the melter-gasifier 98
together with the coal briquettes.
10 A dome portion 981 is provided in an upper portion of the melter-gasifier
98. That is, a space that is wider than other portions of the melter-gasifier 98
is formed, and high-temperature reduction gas exists in the space. Thus, the
coal briquettes charged into the dome portion 981 can be easily divided by the
high-temperature reduction gas. That is, since the coal briquettes are charged
15 into the upper portion of the melter-gasifier 98 maintained at 1000 "C, the coal
briquettes are subjected to rapid thermal impact. Accordingly, the coal
briquettes may be differentiated while moving to the lower portion of the meltergasifier.
However, coal briquettes manufactured by the method of FIG. 1 have
20 high hot strength, and therefore the coal briquettes are not differentiated at the
dome portion of the melter-gasifier 10 and fall to the bottom of the meltergasifier
98 while being maintained as char. The char generated from thermal
decomposition of coal briquettes moves to the bottom of the melter-gasifier 983
and then exothermically reacts with oxygen supplied through the tuyere 983.
27
Thus, the coal briquettes can be used as a heat source that maintains the
melter-gasifier 210 at a high temperature. Meanwhile, since char provides
ventilation, a large amount of gas generated from the lower portion of the
melter-gasifier 980 and reduced iron supplied from the fluidized-bed reduction
5 furnace 90 can more easily and uniformly pass through the coal-packed bed in
the melter-gasifier 98.
In addition to the above-stated coal briquettes, lump carbon ash or coke
may be charged into the melter-gasifier 98, as necessary. The tuyere 983 is
provided in an outer wall of the melter-gasifier 98 for injection of oxygen.
lo Oxygen is injected into the coal-packed bed such that a fire zone is formed.
The coal briquettes may be burned in the fire zone to generate the reduction
gas.
FIG. 8 schematically illustrates another molten iron manufacturing
apparatus 2000 including the coal briquette manufacturing apparatuses 100,
is 200, 300, and 400 of FIG. 2 to FIG. 5. A structure of the molten iron
manufacturing apparatus 2000 of FIG. 8 is similar to that of the molten iron
manufacturing apparatus 1000 of FIG. 7, and therefore like reference numerals
designate like elements in the molten iron production apparatus 1000 of FIG. 7
and a detailed description thereof will be omitted.
20 As shown in FIG. 8, the molten iron manufacturing apparatus 2000
includes a fluidized bed reducing furnace 92, coal briquette manufacturing
apparatuses 100, 200, 300, and 400, and a melter-gasifier 98. Thus, the
molten iron manufacturing apparatus 2000 may further include other devices.
Iron ores are charged into the fluidized bed reducing furnace 92 and thus
28
reduced therein. The iron ores charged into the fluidized bed reducing furnace
92 are pre-dried and then manufactured as reduced iron while passing through
the fluidized bed reducing furnace 92. The fluidized bed reducing furnace 92
receives reduction gas from the melter-gasifier 98 and forms a packed bed
5 therein. The coal briquette manufacturing apparatuses 100, 200, 300, and 400
manufacture coal briquettes, and the coal briquettes are charged into the
melter-gasifier 98 and thus used as a heat source for melting reduced iron. In
order to burn the coal briquettes, oxygen is injected through a tuyere 983 such
that a fire zone is formed. Thus, the reduced iron is melted by burning heat of
lo the coal briquettes such that molten iron can be manufactured.
Hereinafter, the present invention will be described in further detail with
reference to experimental examples. Such experimental examples merely
illustrate the present invention and the present invention is not limited thereto.
Experimental Example of Raw Suqar Solution
15 Pulverized coal, quicklime, a raw sugar solution, and molasses are
mixed to manufacture coal briquettes. A concentration of the raw sugar
solution in the mixture is variously adjusted, and properties of the raw sugar
solution and the molasses are shown in Table 3.
(Table 3)
Molasses
51 .O
Item
Total raw sugar
Concentration of raw sugar solution
85
%
85
75 %
75.5
65 %
65.6
55 %
55.7
45 %
45.6
35 %
35
Experimental Example 1
Coal briquettes were manufactured by using 2.7 parts by weight of
quicklime, 5 parts by weight of molasses (3.25 parts by weight of solid content),
5 and 5 parts by weight of an 85 % raw sugar-concentrated solution with respect
to 100 parts by weight of pulverized coal. A moisture amount in the pulverized
coal was 8.5 parts by weight. The remaining experiment processes were the
same as the above-stated experimental example.
Experimental Example 2
10 Coal briquettes were manufactured by using 2.7 parts by weight of
quicklime, 5 parts by weight of molasses (3.25 parts by weight of solid content),
and 3 parts by weight of an 85 % raw sugar-concentrated solution with respect
to 100 parts by weight of pulverized coal. A moisture amount in the pulverized
coal was 8.5 parts by weight. The remaining experiment processes were the
same as Experimental Example 1.
Experimental Example 3
Coal briquettes were manufactured by using 2.7 parts by weight of
quicklime, 5 parts by weight of molasses (3.75 parts by weight of solid content),
5 and 5 parts by weight of a 75 % raw sugar-concentrated solution with respect to
100 parts by weight of pulverized coal. The remaining experiment processes
were the same as Experimental Example 1.
Experimental Example 4
Coal briquettes were manufactured by using 2.7 parts by weight of
lo quicklime, 5 parts by weight of molasses (3.75 parts by weight of solid content),
and 3 parts by weight of a 75 % raw sugar-concentrated solution with respect to
100 parts by weight of pulverized coal. The remaining experiment processes
were the same as Experimental Example 1.
Experimental Example 5
15 Coal briquettes were manufactured by using 2.7 parts by weight of
quicklime, 5 parts by weight of molasses (3.75 parts by weight of solid content),
and 5 parts by weight of a 65 % raw sugar-concentrated solution with respect to
100 parts by weight of pulverized coal. The remaining experiment processes
were the same as Experimental Example 1.
20 Experimental Example 6
Coal briquettes were manufactured by using 2.7 parts by weight of
quicklime, 5 parts by weight of molasses (3.75 parts by weight of solid content),
and 3 parts by weight of a 65 % raw sugar-concentrated solution with respect to
100 parts by weight of pulverized coal. The remaining experiment processes
3 1
were the same as Experimental Example 1.
Experimental Example 7
Coal briquettes were manufactured by using 2.7 parts by weight of
quicklime, 5 parts by weight of molasses (3.75 parts by weight of solid content),
and 4 parts by weight of a 65 % raw sugar-concentrated solution with respect to
100 parts by weight of pulverized coal. The remaining experiment processes
were the same as Experimental Example 1.
Experimental Example 8
Coal briquettes were manufactured by using 2.7 parts by weight of
quicklime, 5 parts by weight of molasses, and 5 parts by weight of a 55 % raw
sugar-concentrated solution with respect to 100 parts by weight of pulverized
coal. The remaining experiment processes were the same as Experimental
Example 1.
Experimental Example 9
Coal briquettes were manufactured by using 2.7 parts by weight of
quicklime, 5 parts by weight of molasses (3.75 parts by weight of solid content),
and 5 parts by weight of a 55 % raw sugar-concentrated solution with respect to
100 parts by weight of pulverized coal. The remaining experiment processes
were the same as Experimental Example 1.
Experimental Example 10
Coal briquettes were manufactured by using 2.7 parts by weight of
quicklime, 5 parts by weight of molasses, and 5 parts by weight of a 55 % raw
sugar-concentrated solution with respect to 100 parts by weight of pulverized
coal. The remaining experiment processes were the same as Experimental
32
Example 1.
Comparative Example 1
Coal briquettes were manufactured by using 2.7 parts by weight of
quicklime and 10 parts by weight of molasses with respect to 100 parts by
weight of pulverized coal. The remaining experiment processes were the
same as Experimental Example 1.
Comparative Example 2
Coal briquettes were manufactured by using 2.7 parts by weight of
quicklime and 5 parts by weight of molasses (3.75 parts by weight of solid
content) with respect to 100 parts by weight of pulverized coal. The remaining
experiment processes were the same as Experimental Example 1.
Experiment Result of Raw Sugar Solution
Compression strength and drop strength (4 times, 8 times) of coal
briquettes manufactured according to the above-stated Experimental Example 1
to Experimental Example 10, Comparative Example 1, and Comparative
Example 2 were measured. Results of the measurement are shown in Table 4.
(Table 4)
~ ~
NO Experimenta Parts by Concentr I Compres I Drop I Drop 1 weight of ation sion I strength / strength
sugar
ExamplelCo
mparative
Example
Molasses (%)/parts
by weight
of raw
strength
(kg f )
(4 times) (8 times)
94.8
94.5
94.8
94.5
98
98
98
98
98
98
98
97.8
97.6
97.8
97.6
99
99
99
99
99
99
99
75
55
66.0
50.3
66.0
46.0
50.1
51.3
50.2
50.0
50.5
1
2
3
4
5
6
7
I
8
9
10
11
5
5
5
5
5
5
5
5
5
5
10
Experimenta
I Example
Experimenta
I Example 2
Experimenta
I Example 3
Experimenta
I Example 4
Experimenta
I Example 5
Experimenta
I Example 6
Experimenta
I Example 7
Experimenta
I Example 8
Experimenta
I Example 9
Experimenta
I Example 10
Comparative
Example 1
solution
8515
8513
7515
7513
6515
6513
6514
5515
5514
5515
0
As a result of the experiment, the compression strengths and the drop
strengths of the coal briquettes manufactured according to Experimental
Example 1 to Experimental Example 10 of the present invention were shown to
5 be increased compared to Comparative Example 1 and Comparative Example 2.
Further, when a sufficient amount of raw sugar solution was used in
Experimental Example 1 to Experimental Example 7, the compression strengths
and the drop strengths of the coal briquettes were more increased. In addition,
65
since the cost of molasses is much cheaper than the cost of the raw sugar
lo solution with respect to the same parts by weight, the manufacturing cost of
coal briquettes can be further reduced by mixing molasses and the raw sugar
solution.
Experimental Example of Sucrose, Glucose, and Fructose
Experimental Example 11
15 2.7 parts by weight of CaO as a hardener and 2 parts by weight of
sucrose and 6 parts by weight of molasses as binders were mixed with respect
to 100 parts by weight of coal to manufacture coal briquettes. The remaining
experiment processes were the same as the above-stated experimental
example.
20 Experimental Example 12
2.7 parts by weight of CaO as a hardener and 4 parts by weight of
sucrose and 6 parts by weight of molasses as binders were mixed with respect
35
12 Comparative 5 0 48.4 75
Example 2
to 100 parts by weight of coal to manufacture coal briquettes. The remaining
experiment processes were the same as Experimental Example 1.
Experimental Example 13
2.7 parts by weight of CaO as a hardener and 2 parts by weight of
5 glucose and 6 parts by weight of molasses as binders were mixed with respect
to 100 parts by weight of coal to manufacture coal briquettes. The remaining
experiment processes were the same as the above-stated experimental
example.
Experimental Example 14
10 2.7 parts by weight of CaO as a hardener and 4 parts by weight of
glucose and 6 parts by weight of molasses as binders were mixed with respect
to 100 parts by weight of coal to manufacture coal briquettes. The remaining
experiment processes were the same as Experimental Example 1.
Experimental Example 15
15 2.7 parts by weight of CaO as a hardener and 2 parts by weight of
fructose and 6 parts by weight of molasses as binders were mixed with respect
to 100 parts by weight of coal to manufacture coal briquettes. The remaining
experiment processes were the same as the above-stated experimental
example.
20 Experimental Example 16
2.7 parts by weight of CaO as a hardener and 4 parts by weight of
fructose and 6 parts by weight of molasses as binders were mixed with respect
to 100 parts by weight of coal to manufacture coal briquettes. The remaining
experiment processes were the same as Experimental Example 1.
36
Comparative Example 3
2.7 parts by weight of CaO as a hardener and 6 parts by weight of
molasses as a binder were mixed with respect to 100 parts by weight of coal to
manufacture coal briquettes. The remaining experiment processes were the
5 same as Experimental Example 1.
Comparative Example 4
2.7 parts by weight of CaO as a hardener and 8 parts by weight of
molasses as a binder were mixed with respect to 100 parts by weight of coal to
manufacture coal briquettes. The remaining experiment processes were the
l o same as Experimental Example 1.
Comparative Example 5
2.7 parts by weight of CaO as a hardener and 10 parts by weight of
molasses as a binder were mixed with respect to 100 parts by weight of coal to
manufacture coal briquettes. The remaining experiment processes were the
15 same as Experimental Example 1.
Experiment result of Sucrose, Glucose. and Fructose
Cold strength and hot strength of coal briquettes manufactured
according to the above-stated Experimental Example 11 to Experimental
Example 16 and Comparative Example 3 to Comparative Example 5 were
20 measured, and technical analysis was performed. Such an experiment
process is known to a person skilled in the art, and therefore no further
description will be provided.
Table 5 shows results of experiments of coal briquettes manufactured
according to the above-stated Experimental Example 11 to Experimental
37
Example 16 and Comparative Example 3 to Comparative Example 5. As
shown in Table 5, cold strengths and hot strengths of the coal briquettes were
improved when sucrose, glucose, and fructose were used as binders together
with molasses rather than only using molasses as a binder. In addition, when
5 fructose was added, the cold strengths of the coal briquettes were more
improved compared to a case of adding glucose and fructose.
(Table 5)
I I I I I I I I
FC- 5 6 6 i 56.2" 55.4' 55.W 559J 562" 55.3' 56.2" 55.94 -
,
%
Id
Str
en
gt
h+
Ho
While this invention has been described in connection with what is
38
Experi
mental
Ex.lGt'
2.7'
0.'
ession
strengt
hBaW
Drop
StrengJ
h{%k'
Loss.'
Experi
mental
Ex. 14"
2.7s
0.'
Experi
mental
E x . 1 9
2.7s
O+'
Experi
mental
Ex. I24
2.7?
4"
28.70
29.9+'
Experi
mental
Ex.134
2.74
0.'
Compa
rative
Ex. W
2.7'
04
Compa
rative
Ex.3.'
2.7.'
0,'
Section*
hli
xin
68.2~
30.8.'
Cornpa
rative
Ex.%
2.74
0"
C I F
q Sucr
Experi
mental
Ex. 114
2.74
2"
92.2'
31.0+'
80.0"
31.3'
95.8"
31.1.'
422"
29.6"
72.54
31.ld
31.84
30.8'
86.6'
31.3"
. I
.
presently considered to be practical exemplary embodiments, it is to be
understood that the invention is not limited to the disclosed embodiments, but,
on the contrary, is intended to cover various modifications and equivalent
arrangements included within the spirit and scope of the appended claims.
5
WHAT IS CLAIMED IS:
1. A method for manufacturing coal briquettes by using a molten
iron manufacturing apparatus that includes a melter-gasifier into which reduced
5 iron is charged and a reducing furnace connected with the melter-gasifier and
providing the reduced iron, wherein the coal briquettes are charged into a dome
portion of the melter-gasifier and then quickly heated, comprising:
providing pulverized coal;
providing molasses;
10 providing a raw sugar binder;
providing a mixture made by adding the molasses and the raw sugar to
the pulverized coal; and
providing coal briquettes by shaping the mixture.
15 2. The method for manufacturing the coal briquettes of claim 1,
wherein, in the providing the raw sugar binder, the raw sugar binder is provided
as a raw sugar solution, and the raw sugar solution includes raw sugar at about
35 wt% to about 85 wt%.
20 3. The method for manufacturing the coal briquettes of claim 2,
wherein the raw sugar solution includes raw sugar at about 65 wt% to about 85
wt%.
4. The method for manufacturing the coal briquettes of claim 1,
40
further comprising adding a hardener to the pulverized coal before providing the
molasses,
wherein, in the providing the mixture, the molasses and the raw sugar
binder are individually added to the pulverized coal.
5
5. The method for manufacturing the coal briquettes of claim 1,
further comprising adding a hardener to the pulverized coal before providing the
molasses,
wherein, in the providing the mixture, the molasses and the raw sugar
lo binder are premixed and then added to the pulverized coal.
6. The method for manufacturing the coal briquettes of claim 5,
wherein the raw sugar is transferred to the molasses and then mixed with the
molasses such that a raw sugar solution, which is the raw sugar binder, is
15 manufactured, and then the raw sugar solution is added to the pulverized coal.
7. The method for manufacturing the coal briquettes of claim 5,
wherein, when the hardener is added to the pulverized coal, the hardener is at
least one selected from a group consisting of quicklime, slaked lime, calcium
20 carbonate, cement, bentonite, clay, silica, dolomite, phosphoric acid, and
sulfuric acid.
8. The method for manufacturing the coal briquettes of claim 1,
wherein the providing the raw sugar binder comprises:
4 1
providing a melted solution by melting raw sugar with steam at about
70 "C to about 120 "C; and
providing the raw sugar binder by adding water to the melted solution
and agitating the water-added raw sugar binder at a temperature of about 60 "C
5 to about 70 "C.
9. The method for manufacturing the coal briquettes of claim 8,
wherein the providing the raw sugar binder further comprises adjusting a
concentration of the raw sugar solution by adding water to the raw sugar
10 solution.
10. The method for manufacturing the coal briquettes of claim 1,
wherein the providing the raw sugar binder comprises:
crushing sugarcane while injecting water;
15 providing sugarcane juice by juicing the crushed sugarcane; and
providing sugarcane syrup by removing impurities from the sugarcane
juice and concentrating the sugarcane juice, and
the sugarcane syrup is provided as the raw sugar binder.
20 11. The method for manufacturing the coal briquettes of claim 10,
wherein, in the providing the sugarcane juice, the amount of solid content
included in the sugarcane juice is about 10 wt% to about 30 wt%.
12. The method for manufacturing the coal briquettes of claim 11,
42
wherein, in the providing the sugarcane syrup, the amount of solid content
included in the sugarcane syrup is about 50 wt% to about 80 wt%.
13. The method for manufacturing the coal briquettes of claim 1,
5 wherein the reducing furnace is a fluidized bed reduction furnace or a packed
bed reduction furnace.
14. The method for manufacturing the coal briquettes of claim 1,
wherein, in the providing the coal briquettes, the amount of raw sugar binder is
lo about 3 wt% to about 10 wt% of the coal briquettes.
15. The method for manufacturing the coal briquettes of claim 14,
wherein the amount of raw sugar binder is about 3 wt% to about 5 wt%.
15 16. The method for manufacturing the coal briquettes of claim 14,
wherein the amount of molasses is about 5 wt% to about 15 wtOh of the mixture,
and the amount of raw sugar binder is less than the amount of molasses.
17. The method for manufacturing the coal briquettes of claim 1,
20 wherein, in the providing the raw sugar binder, the raw sugar binder comprises
sucrose, and the amount of sucrose is about 2 wt% to about 5 wt% with respect
to 100 wt% of pulverized coal.
18. The method for manufacturing the coal briquettes of claim 1,
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wherein, in the providing of the raw sugar binder, the raw sugar binder
comprises glucose, and the amount of glucose is about 2 wt% to about 4 wt%
with respect to 100 wt% of pulverized coal.
5 19. The method for manufacturing the coal briquettes of claim 1,
wherein, in the providing the raw sugar binder, the raw sugar binder comprises
fructose, and the amount of fructose is about 2 wt% to about 4 wt% with respect
to 100 wt% of pulverized coal.
20. Coal briquettes manufactured in a molten manufacturing
apparatus that includes a melter-gasifier into which reduced iron is charged and
a reducing furnace connected with the melter-gasifier and providing the reduced
iron, and that are charged into a dome portion of the melter-gasifier and then
quickly heated, comprising pulverized coal, molasses, a raw sugar binder, and a
15 hardener,
wherein, when the raw sugar binder comprises sucrose, the amount of
sucrose is about 1.35 wt% about to 9 wt% with respect to 100 wt% of pulverized
coal.
21. The coal briquettes of claim 20, wherein the amount of sucrose
is about 2.7 wt% to about 9 wt%.
22. The coal briquettes of claim 21, wherein the amount of sucrose
is about 3.6 wt% to about 9 wt%.
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23. The coal briquettes of claim 21, wherein the hardener is at least
one selected from a group consisting of quicklime, slaked lime, calcium
carbonate, cement, bentonite, clay, silica, dolomite, phosphoric acid, and
5 sulfuric acid, and the amount of hardener is about 1 wt% to about 5 wt% with
respect to 100 wt% of the pulverized coal.
24. A coal briquette manufacturing apparatus comprising:
at least one raw sugar solution storage bin applied to store a raw sugar
lo solution;
a pulverized coal storage bin applied to store pulverized coal;
a molasses storage bin applied to store molasses;
a mixer connected with each of the raw sugar solution storage bin, the
pulverized coal storage bin, and the molasses storage bin to receive the raw
15 sugar solution, the pulverized coal, and the molasses to manufacture a mixture;
and
a pair of rollers connected with the mixer, receiving the mixture, and
compressing the mixture.
20 25. The coal briquette manufacturing apparatus of claim 24, wherein
the raw sugar solution storage bin comprises:
a casing;
a transfer screw provided in the casing and extended in a length
direction of the raw sugar solution storage bin; and
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a steam supply pipe connected with the casing and supplying steam into
the casing therethrough.
26. The coal briquette manufacturing apparatus of claim 24, further
5 comprising:
a raw sugar storage bin supplying raw sugar; and
a pre-mixer connecting the raw sugar storage bin and the raw sugar
solution storage bin, and transferring the raw sugar while pre-agitating the same.
27. The coal briquette manufacturing apparatus of claim 26, wherein
the pre-mixer extends in a horizontal direction.
28. The coal briquette manufacturing apparatus of claim 26, wherein
the at least one raw sugar storage bin comprises a pair of raw sugar solution
15 storage bins that are provided at a distance from each other, and the pre-mixer
is connected with the pair of raw sugar solution storage bins.
29. The coal briquette manufacturing apparatus of claim 24, further
comprising a raw sugar concentration adjuster connected with the raw sugar
20 solution storage bin and provided with a water supply line.
30. A coal briquette manufacturing apparatus comprising:
a raw sugar storage bin applied to store raw sugar;
a molasses storage bin storing molasses, connected with the raw sugar
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storage bin to receive the raw sugar therefrom, and provided with a heat coil to
melt the molasses and the raw sugar by heating;
a pulverized coal storage bin applied to store pulverized coal;
a mixer connected with each of the pulverized coal storage bin and the
5 molasses storage bin and manufacturing a mixture by receiving the molasses
and the pulverized coal; and
a pair of rollers connected with the mixer, receiving the mixture, and
compressing the mixture.