D e s c r i p t i o n
T i t l e of I n v e n t i o n : METHOD FOR DEACTIVATING COAL
T e c h n i c a l F i e l d
[OOOl]
The present invention relates to a coal
deactivation processing apparatus in which coal is
deactivated with processing gas containing oxygen.
B a c k g r o u n d A r t
[0002]
Dry-distilled coal has an activated surface and
tends to bond with oxygen. Accordingly, when the coal
is stored as it is, heat generated by reaction with
oxygen in air may cause the coal to spontaneously
combust. In view of this, for example, in Patent
Literatures 1, 2 listed below and the like, coal
subjected to dry distillation (300°C to 500°C) is
cooled and then subjected to coal deactivation
processing in which oxygen is adsorbed to the coal by
exposing the coal to a processing gas atmosphere ( 1 0 0 " ~
to 2 0 0 " ~ )co ntaining oxygen. Spontaneous combustion of
upgraded coal in storage can be thus prevented.
C i t a t i o n L i s t
P a t e n t L i t e r a t u r e s
[0003]
Patent Literature 1: Japanese Patent Application
Publication No. Sho 59-074189
Patent Literature 2: Japanese Patent Application
Publication No. Sho 60-065097
Summary of Invention
T e c h n i c a l P r o b l e m
[0004]
When the deactivation processing of the upgraded
coal is performed as described in Patent Literatures
1, 2 and the like, the upgraded coal is deactivated in
such a way that more oxygen is first adsorbed to a
surface portion of the coal than to an internal portion
thereof. Accordingly, the deactivation processing of
Patent Literatures 1, 2 and the like has a problem that,
when the deactivation processing is terminated at a
stage where a necessaryand sufficient amount of oxygen
is adsorbed tothe surface portion ofthe coal, the coal
may spontaneously combust if the coal breaks due to
impact or the like and the internal portion of the coal
is exposed to the outside. Meanwhile, when the
deactivation processing is performedin such a way that
the necessary and sufficient amount of oxygen is
adsorbed also to the internal portion of the coal, a
more than necessary amount of oxygen is adsorbed to the
surface portion of the coal and the combustion heating
value per unit weight of the coal is greatly reduced.
[ 0 0 0 5 ]
In view ofthis, an object ofthe present invention
is to provide a coal deactivation processing method
capable of suppressing reduction of the combustion
heating value per unit weight of the coal while
preventing spontaneous combustion of the coal.
Solution to Problem
[0006]
A coal deactivation processing method of a first
aspect of the invention to solve the problem described
above is a coal deactivation processingmethodin which
coal is deactivated with processing gas containing
oxygen, characterized in that the method comprises
subjecting the coal to deactivation processing within
a temperature range of 40°C to 95°C.
[0007]
A coal deactivation processing method of a second
aspect of the invention is the coal deactivation
processing method of the first aspect of the invention
characterized in that the coal is subjected to the
deactivation processing after the coal is
compression-molded in such a way that the
compression-molded coal has a surface area equivalent
sphere diameter R, which is expressed by formula (I),
of 5 mm to 50 mm,
R = 6 x (V/A) (1
where V represents a coal particle volume and A
represents a coal particle external surface area.
[0008]
A coal deactivation processing method of a second
aspect of the invention is the coal deactivation
processing method of the first or second aspect of the
invention characterized in that the coal is
dry-distilled coal.
Advantageous E f f e c t s o f Invention
[0009]
In the coal deactivation processing method of the
present invention, the amount of oxygen adsorbed to a
surface portion of the coal per unit time (adsorption
rate) is smaller (slower) than that in a conventional
technique and oxygen enters an internal portion of the
coal and is adsorbed thereto in an earlier stage than
in the conventional technique. Accordingly, a
difference in the oxygen adsorption amount between the
surface portion and the internal portion of the coal
is much smallerthanthat in the conventional technique.
As a result, it is possible to suppress reduction of
a combustion heating value per unit weight of the coal
while preventing spontaneous combustion of the coal.
Brief Description of Drawings
[OOlO]
[Fig. 11 Fig. 1is a flow diagramof a first embodiment
of a coal upgrading method using a coal deactivation
processing method of the present invention.
[Fig. 21 Fig. 2 is a graph showing oxygen adsorption
amounts in internal positions of coal particles
subjected to the deactivation processing.
[Fig. 31 Fig. 3 is a flow diagram of a second
embodiment of a coal upgrading method using the coal
deactivation processing method of the present
invention.
Description of Embodiments
[OOll]
Embodiments of a coal deactivation processing
method of the present invention are described based on
the drawings. However, the present invention is not
limited to the embodiments described below based on the
drawings.
[0012]

A first embodiment of a coal upgrading method
using a coal deactivation processing method of the
present invention is described based on Figs. 1 and 2.
[0013]
As shown in Fig. 1, first, low-grade coal 10 with
high water content such as brown coal and
sub-bituminous coal is heated (about 150°C to about
300°C) in an atmosphere of inert gas 1 such as nitrogen
gas to cause moisture 3 to evaporate from the coal 10
and is thereby dried (drying step S11). Then, the coal
10 is further heated (about 300°C to about 5 0 0 " ~ )i n
the atmosphere of the inert gas 1 to remove
dry-distillation gas 4 of a low-boiling-point
component and dry-distillation oil 5 of a
high-boiling-point component from the coal 10 through
distillation (dry-distillation step S12).
[0014]
After being cooled (about 40°C to about 60°C)
(cooling step S13), the dry-distilled coal 10 is
subjected to heat treatment (40 "C to 95°C (preferably
45°C to 70°C) in an atmosphere of processing gas 2 (for
example, gas whose oxygen concentration is adjusted to
be about 5% to about 10% by mixing nitrogen to air)
containing oxygen and is thereby turned into upgraded
coal 11 (deactivation processing step ,514).
[0015]
Here, since a heat treatment temperature in the
deactivation processing (40°Cto 95°C (preferably 45°C
to 70°C)) is lower than that in a conventional technique
(100°C to 200°c), the amount of oxygen adsorbed to a
surface portion ofthe coal10 per unit time (adsorption
rate) is smaller (slower) than that in the conventional
technique and a large amount of oxygen enters an
internal portion of the coal 10 and is adsorbed thereto
in an earlier stage than in the conventional technique.
[0016]
Accordingly, in the coal 10, the oxygenadsorption
amount per unit time (oxygen adsorption rate) in the
surface portion is lower than that in the conventional
technique while the oxygen adsorption amount per unit
time in the internal portion is higher than that in the
conventional technique. Hence, in the upgraded coal 11
subjected to the deactivation processing, a difference
in the oxygen adsorption amount between the surface
portion and the internal portion is much smaller than
that in the conventional technique (see Fig. 2).
[0017]
Accordingly, the coal deactivation processing
method of the embodiment can suppress reduction of a
combustion heating value of per unit weight the
upgraded coal 11 while preventing spontaneous
combustion of the upgraded coal 11.
[0018]
Moreover, since the heat treatment temperature in
the deactivation processing (40°C to 9 5 " ~(p referably
4 5 " t~o 7 0 " ~ ) )i s lower than that in the conventional
technique ( 1 0 0 "t~o 200°c), the amount of the upgraded
coal 11 combusted in the deactivation processing can
be reduced compared to that in the conventional
technique. Accordingly, the production amount of the
upgraded coal 11 can be improved compared to that in
the conventional technique.
[0019]
Note that, when the heat treatment temperature in
the deactivation processing exceeds 9 5 " ~it~ is
difficult to suppress reduction of the combustion
heating value of per unit weight the upgraded coal 11
while preventing spontaneous combustion of the
upgraded coal 11. Meanwhile, when the heat treatment
temperature is below 40°c, the time required for the
deactivation processing is too long and production
efficiency is deteriorated. Accordingly, these cases
are not preferable.
[0020]

A second embodiment of a coal upgrading method
using the coal deactivation processing method of the
present invention is described based on Fig. 3. Note
that the same parts as those of the aforementioned
embodiment are denoted by the same reference numerals
as those used in the description of the aforementioned
embodiment and description overlapping the description
of the aforementioned embodiment is omitted.
[0021]
As shown in Fig. 3, the coal 10 is subjected to
the drying step S11, the dry-distillation step S12, and
the cooling step S13 as in the aforementioned first
embodiment, and is then pulverized by a pulverizer or
the like in such a way that a diameter of each of
particles of the coal 10 is equal to or smaller than
a specific diameter (for example, lmm) (pulverization
step S25). Thereafter, the coal 10 is
compression-molded into a briquette shape by a molding
machine such as a briquetter in such a way that the
compression-molded coal 10a has a surface area
equivalent sphere diameter R, which is expressed by
formula (1) shown below, of a specific size (5 mm to
50 mm (preferably, 15 mm to 30 mm) ) (molding step S26).
[0022]
R = 6 x (V/A) (1)
where V represents a coal particle volume and A
represents a coal particle external surface area.
[0023]
After the coal 10 is molded into the briquette
shape as described above, the deactivation processing
step S14 is performed on the coal 10 as in the
aforementioned first embodiment and upgraded coal 21
is thus obtained.
[0024]
In this case, since the coal 10 is molded into the
briquette shape having the surface area equivalent
sphere diameter R of the specific size (5 mm to 50 mm
(preferably, 15 mm to 30 mm)), variation in areas of
the particles are smaller and there is hardly no
variation in the oxygen adsorption amount per unit time
(oxygen adsorption rate) in each of the briquettes.
Moreover, the oxygen adsorption amounts per unit time
ofthe respective briquettes (oxygen adsorption rates)
are substantially the same.
[0025]
Hence, the briquettes can be evenly subjected to
the deactivation processing and, in addition, the
deactivationprocessing canbe performed substantially
uniformly with variations among the briquettes being
eliminated.
[0026]
Accordingly, in the coal deactivation processing
method of the embodiment, the effects similar to those
in the aforementioned first embodiment can be obtained
as amatter of course and the upgraded coal llsubjected
to the deactivation processing more uniformly than in
the aforementioned first embodiment can be easily
obtained.
[0027]
Note that, when the surface area equivalent sphere
diameter R of the coal 10 compression-molded into the
briquette shape exceeds 50 mm, an oxygen adsorption
rate per unit mass is too slow and the time required
forthe deactivationprocessingis too long. Meanwhile,
when the surface area equivalent sphere diameter R is
smaller than 5 mm, molding efficiency is deteriorated.
Accordingly, these cases are not preferable.
[0028]
When the surface area equivalent sphere diameter
Ris within a range of 15 mmto 30 mm, the heat treatment
within the aforementioned temperature range can be
easily performed even if air is used as it is as the
processing gas 2. Hence, work and a facility required
for the deactivation processing can be greatly
simplified and this case is thus very preferable.
Industrial Applicability
[0029]
Since the coal deactivation processing method of
the present invention can suppress reduction of the
combustion heating value per unit weight of coal while
preventing spontaneous combustion ofthe coal, the coal
deactivation processing method can be very useful in
the energy industry and the like.
Reference Signs List
[0030]
1 INERT GAS
2 PROCESSING GAS
3 MOISTURE
4 DRY-DISTILLATION GAS
5 DRY-DISTILLATION OIL
10 COAL
11, 21 UPGRADED COAL
S11 DRYING STEP
S12 DRY-DISTILLATION STEP
S13 COOLING STEP
S14 DEACTIVATION PROCESSING STEP
S25 PULVERIZATION STEP
S26 MOLDING STEP
Claims
[Claim 1 1
A coal deactivation processing method in which
coal is deactivated with processing gas containing
oxygen, characterized in that the method comprises
subjecting the coal to deactivation processing within
a temperature range of 4 0 " ~to 9 5 " ~ .
[Claim 21
The coaldeactivationprocessingmethodaccording
to claim 1, characterized in that the coal is subjected
to the deactivation processing after the coal is
compression-molded in such a way that the
compression-molded coal has a surface area equivalent
sphere diameter R, which is expressed by formula (I),
of 5 mm to 50 mm,
R = 6 x ( V / A ) (1)
where V represents a coal particle volume and A
represents a coal particle external surface area.
[Claim 31
The coaldeactivationprocessingmethodaccording
to claim 1 or 2, characterized in that the coal is
dry-distilled coal.
Abstract
Amethod for deactivating coal, in which coal (10)
is deactivated with a treatment gas (2) containing
oxygen, wherein a deactivation step for deactivating
the coal (10) in a temperature range 40-95"~is carried
out.
Fig 7
I S11
INERT
GAS 3
I ~RY-DISTILLATION)--- 4
300-500°c
-
DRY- GAS
DISTILLATION F
RY-DISTILLATIO
OIL
5
S13
2
40-95"C , DEACTIVATION ,
PROCESSING
S14
Fig. 2
It
LARGE
Z
3
0
H
4
z
0
i=
tax
0
V) a
4
Z
W
>C3
X
O SMALL
1
SURFACE CENTER
COAL PARTICLE INTERNAL POSITION
IDEAL ADSORPTION AMOUNT
/
-.--.--i------.--.--
' .
;- . I I PRESENT
1' \ INVENTION
CONVENTIONAL TECHNIQUE - - - m m
- r *
Fig. 3
v UI I
DRYING 3
I TRY-DISTILLATION> 4
300- 500°C DRY- GAS
DISTILLATION F
RY-DISTILLATIO
OIL 5
I PULVERIZATION 6 S25
I MOLDING k S26
R = 5-50mm
PROCESSING
~UPGRAD2ED )-
CERTIFICATION
I, Yasuyuki Tanaka, c/o MITSUISHI LAW & PATENT OFFICE, TAKU-Akasaka
Bldg. 4F, 4-9-6 Akasaka, Minato-ku, Tokyo Japan hereby certify that I am the
translator of the certified copy of the documents in respect of an application No.
2012-000941 for a patent filed in Japan on January 6, 2012, and certify that the
following is a true and correct translation to the best of my knowledge and belief.
Date: This 16th day of June 2014
[Document Name] Patent Application
[Code No.] 201101490
[Filing Date] January 6, 2012
[Addressed to] Commissioner of the Patent Office
[International Patent Classification] ClOL 5/00
[Inventor]
[Address or Residence] c/o MITSUBISHI HEAVY INDUSTRIES, LTD.
16-5, Konan 2-chome, Minato-ku, Tokyo
[Name] Keiichi NAKAGAWA
[Inventor]
[Address or Residence] c/o MITSUBISHI HEAVY INDUSTRIES, LTD.
16-5, Konan 2-chome, Minato-ku, Tokyo
[Name] Setsuo OMOTO
[Inventor]
[Address or Residence] c/o MITSUBISHI HEAVY INDUSTRIES, LTD.
16-5, Konan 2-chome, Minato-ku, Tokyo
[Name] Junji ASAHARA
[Applicant for patent]
[Identification Code No.] 000006208
[Name or Appellation] MITSUBISHI HEAVY INDUSTRIES, LTD.
[Identification Code No.] 100078499
[Patent Attorney]
[Name or Appellation] Toshiro Mitsuishi
[Telephone No.] 03-3583-7058
[Identification Code No.] 230 111 796
[Attorney-at-law]
[Name o r Appellation] Tadahiro Mitsuishi
[Telephone No.] 03-3583-7058
[Identification Code No.] 230112449
[Attorney-at-law]
[Name or Appellation] Shumpei Mitsuishi
[Telephone No.] 03-3583-7058
[Identification Code No.] 100102945
[Patent Attorney]
[Name or Appellation] Yasuyuki Tanaka
[Telephone No.] 03-3583-7058
[Identification Code No.] 100120673
[Patent Attorney]
[Name or Appellation] Hiroshi Matsumoto
[Telephone No.] 03-3583-7058
[Indication of Charge]
[Payment Register No. ] 00007607
[Amount] X15,OOO
[Index of Enclosed Documents]
[Enclosure]
[Enclosure]
[Enclosure]
[Enclosure]
Specification
Claims
Abstract
Drawings
[Document Name] Description
[Title of Invention] COAL DEACTIVATION PROCESSING
METHOD
[Technical Field]
[OOOl]
The present invention relates to a coal deactivation
processing apparatus in which coal is deactivated with
processing gas containing oxygen.
[Background Art]
[0002]
Pyrolized coal has an activated surface and tends to
bond with oxygen. Accordingly, when the coal is stored
as it is, heat generated by reaction with oxygen in air
may cause the coal to spontaneously combust. In view
of this, for example, in Patent Literatures 1, 2 listed
below and the like, coal subjected to pyrolysis (300°C
to 500°C) is cooled and then subjected to coal
deactivation processing in which oxygen is adsorbed to
the coal by exposing the coal to a processing gas
atmosphere (100°C to 200°C) containing oxygen.
Spontaneous combustion of upgraded coal in storage can
be thus prevented.
[Citation List]
[Patent Literatures]
[ 0 0 0 3 ]
[Patent Literature 11 Japanese Patent Application
Publication No. Sho 59-074189
[Patent Literature 21 Japanese Patent Application
Publication No. Sho 60-065097
[Summary of Invention]
[Technical Problem]
[0004]
When the deactivationprocessingofthe upgradedcoal
is performed as described in Patent Literatures 1, 2
and the like, the upgraded coal is deactivated in such
a way that more oxygen is first adsorbed to a surface
portion ofthe coal than to an internal portion thereof.
Accordingly, the deactivation processing of Patent
Literatures 1, 2 and the like has a problem that, when
the deactivation processing is terminated at a stage
where a necessary and sufficient amount of oxygen is
adsorbed to the surface portion of the coal, the coal
may spontaneously combust if the coal breaks due to
impact or the like and the internal portion of the coal
is exposed to the outside. Meanwhile, when the
deactivation processingis performedin such a way that
the necessary and sufficient amount of oxygen is
adsorbed also to the internal portion of the coal, a
more than necessary amount of oxygen is adsorbed tothe
surface portion of the coal and the combustion heating
value per unit weight of the coal is greatly reduced.
[ 0 0 0 5 ]
In view of this, an object of the present invention
is to provide a coal deactivation processing method
capable of suppressing reduction of the combustion
heating value per unit weight of the coal while
preventing spontaneous combustion of the coal.
[Solution to Problem]
[0006]
A coal deactivation processing method of a first
aspect of the invention to solve the problem described
above is a coal deactivation processingmethodin which
coal is deactivated with processing gas containing
oxygen, characterized in that the method comprises
subjecting the coal to deactivation processing within
a temperature range of 4 0 " ~to 95°C.
[0007]
A coal deactivation processing method of a second
aspect of the invention is the coal deactivation
processing method of the first aspect of the invention
characterized in that the coal is subjected to the
deactivation processing after the coal is
compression-molded in such a way that the
compression-molded coal has a surface area equivalent
sphere diameter R, which is expressed by formula (I),
of 5 mm to 50 mm,
R = 6 x (V/A) (1)
where V represents a coal particle volume and A
represents a coal particle external surface area.
[0008]
A coal deactivation processing method of a second
aspect of the invention is the coal deactivation
processing method of the first or second aspect of the
invention characterized in that the coal is pyrolized
coal.
[Advantageous Effects of Invention]
[0009]
In the coal deactivation processing method of the
present invention, the amount of oxygen adsorbed to a
surface portion of the coal per unit time (adsorption
rate) is smaller (slower) than that in a conventional
technique and oxygen enters an internal portion of the
coal and is adsorbed thereto in an earlier stage than
in the conventional technique. Accordingly, a
difference in the oxygen adsorption amount between the
surface portion and the internal portion of the coal
is much smallerthanthat in the conventional technique.
As a result, it is possible to suppress reduction of
a combustion heating value per unit weight of the coal
while preventing spontaneous combustion of the coal.
[Brief Description of Drawings]
[OOlO]
[Fig. 11 Fig. 1 is a flow diagram of a first embodiment
of a coal upgrading method using a coal deactivation
processing method of the present invention.
[Fig. 21 Fig. 2 is a graph showing oxygen adsorption
amounts in internal positions of coal particles
subjected to the deactivation processing.
[Fig. 31 Fig. 3 is a flow diagramof a secondembodiment
of a coal upgrading method using the coal deactivation
processing method of the present invention.
[Description of Embodiments]
[OOll]
Embodiments of a coal deactivation processing method
of the present invention are described based on the
drawings. However, the present invention is not limited
to the embodiments described below based on the
drawings.
[0012]

A first embodiment of a coal upgrading method using
a coal deactivation processing method of the present
invention is described based on Figs. 1 and 2.
[0013]
As shownin Fig. 1, first, low-grade coal10 with high
water content such as brown coal and sub-bituminous
coal is heated (about 150°C to about 300°C) in an
atmosphere of inert gas 1 such as nitrogen gas to cause
moisture 3 to evaporate from the coal 10 and is thereby
dried (drying step S11). Then, the coal 10 is further
heated (about 300°C to about 500°C) in the atmosphere
of the inert gas 1 to remove pyrolysis gas 4 of a
low-boiling-point component and pyrolysis oil 5 of a
high-boiling-point component from the coal 10 through
distillation (pyrolysis step S12).
[0014]
After being cooled (about 40°C to about 60°C)
(cooling step S13), the pyrolized coal 10 is subjected
to heat treatment (40°C to 95°C (preferably 45°C to
70°C) in an atmosphere of processing gas 2 (for example,
gas whose oxygen concentration is adjusted to be about
5% to about 10% by mixing nitrogen to air) containing
oxygen and is thereby turned into upgraded coal 11
(deactivation processing step S14).
[ 0 0 15 ]
Here, since a heat treatment temperature in the
deactivation processing (40°C to 95°C (preferably 45°C
to 70°C)) is lower than that in a conventional technique
(100°C to 20O0c), the amount of oxygen adsorbed to a
surface portion ofthe coal10 per unit time (adsorption
rate) is smaller (slower) than that in the conventional
technique and a large amount of oxygen enters an
internal portion of the coal 10 and is adsorbed thereto
in an earlier stage than in the conventional technique.
[0016]
Accordingly, in the coal 10, the oxygen adsorption
amount per unit time (oxygen adsorption rate) in the
surface portion is lower than that in the conventional
technique while the oxygen adsorption amount per unit
time in the internal portion is higher than that in the
conventional technique. Hence, in the upgraded coal11
subjectedto the deactivation processing, a difference
in the oxygen adsorption amount between the surface
portion and the internal portion is much smaller than
that in the conventional technique (see Fig. 2).
[0017]
Accordingly, the coal deactivation processing
method of the embodiment can suppress reduction of a
combustion heating value of per unit weight the
upgraded coal 11 while preventing spontaneous
combustion of the upgraded coal 11.
[0018]
Moreover, since the heat treatment temperature in the
deactivation processing (40°C to 95°C (preferably 45°C
to 70°C)) is lower than that in the conventional
technique (100°C to 200°C), the amount of the upgraded
coal 11 combusted in the deactivation processing can
be reduced compared to that in the conventional
technique. Accordingly, the production amount of the
upgraded coal 11 can be improved compared to that in
the conventional technique.
[0019]
Note that, when the heat treatment temperature in the
deactivation processing exceeds 9 5 " ~ ,it is difficult
to suppress reduction of the combustion heating value
of per unit weight the upgraded coalllwhilepreventing
spontaneous combustion of the upgraded coal 11.
Meanwhile, when the heat treatment temperature is below
40°c, the time required forthe deactivationprocessing
is too long and production efficiency is deteriorated.
Accordingly, these cases are not preferable.
[0020]

A second embodiment of a coal upgrading method using
the coal deactivation processing method ofthe present
invention is described based on Fig. 3. Note that the
same parts as those of the aforementioned embodiment
are denotedbythe same reference numerals as those used
in the description ofthe aforementioned embodiment and
description overlapping the description of the
aforementioned embodiment is omitted.
[0021]
As shown in Fig. 3, the coal 10 is subjected to the
drying step S11, the pyrolysis step S12, and the cooling
step S13 as in the aforementioned first embodiment, and
is then pulverized by a pulverizer or the like in such
a way that a diameter of each of particles of the coal
10 is equal to or smaller than a specific diameter (for
example, 1 mm) (pulverization step S25). Thereafter,
the coal 10 is compression-molded into a briquette
shape by a molding machine such as a briquetter in such
a way that the compression-molded coal10a has a surface
area equivalent sphere diameter R, which is expressed
by formula (1) shown below, of a specific size (5 mm
to 50 mm (preferably, 15 mm to 30 mm)) (molding step
526).
[0022]
R = 6 x (V/A) (1)
where V represents a coal particle volume and A
represents a coal particle external surface area.
[0023]
After the coal 10 is molded into the briquette shape
as described above, the deactivation processing step
S14 is performed on the coal10 as in the aforementioned
first embodiment andupgraded coal21is thus obtained.
[0024]
In this case, since the coal 10 is molded into the
briquette shape having the surface area equivalent
sphere diameter R of the specific size (5 mm to 50 mm
(preferably, 15 mm to 30 mm)), variation in areas of
the particles are smaller and there is hardly no
variation in the oxygen adsorption amount per unit time
(oxygen adsorption rate) in each of the briquettes.
Moreover, the oxygen adsorption amounts per unit time
ofthe respective briquettes (oxygen adsorption rates)
are substantially the same.
[0025]
Hence, the briquettes can be evenly subjected to the
deactivation processing and, in addition, the
deactivationprocessing canbe performed substantially
uniformly with variations among the briquettes being
eliminated.
[0026]
Accordingly, in the coal deactivation processing
method of the embodiment, the effects similar to those
in the aforementioned first embodiment can be obtained
as a matter of course and the upgraded coalllsubjected
to the deactivation processing more uniformly than in
the aforementioned first embodiment can be easily
obtained.
[0027]
Note that, when the surface area equivalent sphere
diameter R of the coal 10 compression-molded into the
briquette shape exceeds 50 mm, an oxygen adsorption
rate per unit mass is too slow and the time required
forthe deactivationprocessingistoolong. Meanwhile,
when the surface area equivalent sphere diameter R is
smaller than 5 mm, molding efficiency is deteriorated.
Accordingly, these cases are not preferable.
[0028]
When the surface area equivalent sphere diameter R
is within a range of 15 mm to 30 mm, the heat treatment
within the aforementioned temperature range can be
easily performed even if air is used as it is as the
processing gas 2. Hence, work and a facility required
for the deactivation processing can be greatly
simplified and this case is thus very preferable.
[Industrial Applicability]
[0029]
Since the coal deactivation processing method of the
present invention can suppress reduction of the
combustion heating value per unit weight of coal while
preventing spontaneous combustion ofthe coal, the coal
deactivation processing method can be very useful in
the energy industry and the like.
[Reference Signs List]
[0030]
1 INERT GAS
2 PROCESSING GAS
3 MOISTURE
4 PYROLYSIS GAS
5 PYROLYSIS OIL
10 COAL
11, 21 UPGRADED COAL
S11 DRYING STEP
S12 PYROLYSIS STEP
S13 COOLING STEP
514 DEACTIVATION PROCESSING STEP
S25 PULVERIZATION STEP
S26 MOLDING STEP
[Document Name] Claims
[Claim 11
A coal deactivation processing method in which coal
is deactivated with processing gas containing oxygen,
characterized in that the method comprises subjecting
the coal to deactivation processing within a
temperature range of 40°c to 9 5 " ~ .
[Claim 21
The coaldeactivationprocessingmethod according to
claim 1, characterized in that the coal is subjected
to the deactivation processing after the coal is
compression-molded in such a way that the
compression-molded coal has a surface area equivalent
sphere diameter R, which is expressed by formula (I),
of 5 mm to 50 mm,
R = 6 x (V/A) (1)
where V represents a coal particle volume and A
represents a coal particle external surface area.
[Claim 31
The coal deactivation processing method according to
claim 1 or 2, characterized inthat the coal is pyrolized
coal.