TECHNICAL FIELD
The present invention pertains to a coal deactivation processing device
performing deactivation processing of coal with a processing gas that contains
oxygen.
5
BACKGROUND ART
Dry distilled coal has an active surface that is prone to bonding with oxygen.
As such, storage as-is poses a risk of spontaneous combustion due to the heat of
reaction with oxygen in the air. For this reason, there are attempts to prevent
10 spontaneous combustion during storage by deactivating the coal through oxygen
bonding on the surface of the coal ahead of time, performed by exposing the dry
distilled coal to an atmosphere of processing gas that includes oxygen.
CITATION LIST
15 Patent Literature(s)
Patent Document 1: Japanese Unexamined Patent Application Publication No. 2007-
237011
Patent Document 2: WO/95/13868
20 SUMMARY OF THE INVENTION
Technical Problem
Coal deactivation processing devices for performing deactivation processing
of dry distilled coal have been developed. Such coal deactivation processing devices
are provided with a rotary kiln and feed pipes. Dry distilled coal and a processing
25 gas are supplied into the rotary kiln. The feed pipes are arranged within the rotary
kiln neighboring each other in the circumferential direction. A coolant flows in each
feed pipe.
The above-described coal deactivation processing devices cause the rotary
kiln and the plurality of feed pipes to rotate. As such, the coal is agitated by the
30 rotation of the rotary kiln while the coolant flowing within the feed pipes cools the
coal. In addition, the plurality of feed pipes pass through an accumulated coal layer
of the coal within the rotary kiln and lift the coal higher than a coal layer surface,
then drop the coal onto the coal layer surface from above, thereby further agitating
3
the coal. Then, the deactivation processing of the coal is performed by the processing
gas.
However, a coal deactivation processing device performing the deactivation
processing of the coal in a more efficient manner is being sought.
In consideration of this background, the present invention has been made i5 n
order to solve the above-described problem, and an object thereof is to provide a coal
deactivation processing device enabling oxygen to be adsorbed to the surface of the
coal in an efficient manner while preventing spontaneous combustion of the coal.
10 Solution to Problem
A coal deactivation processing device according to a first aspect of the
invention and solving the above-described problem performs deactivation of coal
with a processing gas that includes oxygen. The coal deactivation processing device
includes a kiln body provided rotatably into which the coal and the processing gas
15 are supplied, and with a feed pipe provided so as to be able to rotate along with the
kiln body, extending along a lengthwise direction of the kiln body, and having a
coolant flowing therein. A pair of blades is provided on an outer circumferential
section of the feed pipe and protrude in a radial direction. The feed pipe and the pair
of blades are arranged so as to pass through an accumulated coal layer of the coal
20 within the kiln body upon rotation of the kiln body, and such that an angle formed by
a tangent line of a path along which the central axis of the feed pipe passes and a
bisector line of the pair blades is from 0 to 40°.
A coal deactivation processing device according to a second aspect of the
invention and solving the above-described problem is the coal deactivation
25 processing device according to the above-described first aspect, with the pair of
blades being arranged such that a blade angle formed by one blade of the pair of
blades and the bisector line of the pair of blades is greater than an angle of repose.
A coal deactivation processing device according to a third aspect of the
invention and solving the above-described problem is the coal deactivation
30 processing device according to the above-described second aspect, where the blade
angle is from 45 to 85°.
A coal deactivation processing device according to a fourth aspect of the
invention and solving the above-described problem is the coal deactivation
processing device according to any one of the above-described first to third aspects,
4
where a minimum blade length in the radial direction of the feed pipe is from 5 to
45% of a radius of the feed pipe.
Advantageous Effects of Invention
According to the coal deactivation processing device pertaining to the presen5 t
invention, the feed pipe and the pair of blades are arranged so as to pass through an
accumulated coal layer of the coal upon rotation of the kiln body, and are disposed
such that the angle formed by the tangent line of the path along which the central
axis of the feed pipe passes and the bisector line of the pair of blades is from 0 to
10 40°. As such, the coal is agitated by the rotation of the kiln body whi le the coal is
also cooled by the coolant flowing in the feed pipe. In addition, a predetermined
volume of the coal is lifted up by the feed pipe and the pair of blades higher than the
coal layer surface within the kiln body and dropped from above, thus further
agitating the coal and bringing the coal and the processing gas into contact in an
15 efficient manner. As a result, the spontaneous combustion of the coal may be
prevented while causing oxygen to be adsorbed to the surface of the coal in an
efficient manner. As such, in comparison to a situation in which the blades are not
provided on the feed pipe, the overall length of the kiln body may be made shorter,
thus enabling miniaturization of the device.
20
Brief Description of Drawing(s)
FIG. 1 is an overall configuration view of an embodiment of a coal
deactivation processing device pertaining to the present invention.
FIG. 2 is a magnified view of a cross section taken along line II-II of FIG. 1.
25 FIG. 3 is a magnified view of a feed pipe provided on the coal deactivation
processing device.
Description of Embodiments
An embodiment of the coal deactivation processing device pertaining to the
30 present invention is described with reference to the drawings . However, the present
invention is not limited merely to the following embodiment as described with
reference to the drawings.
The embodiment of the coal deactivation processing device pertaining to the
present invention is described with reference to FIG. 1 to FIG. 3.
5
As illustrated in FIG. 1, a coal deactivation processing device 100, performing
deactivation processing of dry distilled coal 1, is equipped with a hopper 101
receiving the dry distilled coal 1 and with a screw feeder 102 provided with a base
end side being continuous with a feed aperture of the hopper 101 and serving as
rotational transport means of transporting the coal 1 within the hopper 101 from on5 e
end side (the base end side) to another end side (a tip end side) via rotation.
The tip end side of the screw feeder 102 is continuous with a base end side of
a rotary kiln body (kiln body) 103 having a tubular shape. The base end side of the
rotary kiln body 103 is continuous with a base end side casing 111 via a sealing
10 device 108. A gas intake aperture 111a taking in a processing gas 13 is provided on a
top portion of the base end side casing 111. The gas intake aperture 111a is
connected to a tip end side of a processing gas supply pipe 121 supplying the
processing gas 13. A blower 127 and a heating device 128 are provided in the path of
the processing gas supply pipe 121.
15 A tip end side of an air supply pipe 122 supplying air 11 and a tip end side of
a nitrogen supply pipe 123 supplying nitrogen gas 12 are respectively connected to
the base end side of the processing gas supply pipe 121. The base end side of the air
supply pipe 122 is open to the atmosphere. The base end side of the nitrogen supply
pipe 123 is connected to a nitrogen supply source 124, such as a nitrogen gas tank.
20 Flow rate regulation valves 125, 126 are respectively provided in the paths of the air
supply pipe 122 and the nitrogen supply pipe 123.
The tip end side of the rotary kiln body 103 is continuous with a tip end side
casing 112 via sealing devices 109a, 109b. A gas ejection aperture 112a ejecting used
processing gas 14 is provided on a top portion of the tip end side casing 112. The gas
25 ejection aperture 112a is connected to a base end side of a processing gas ejection
pipe 131 ejecting the used processing gas 14. A temperature sensor 131a is provided
in the path of the processing gas ejection pipe 131. A chute 112b dropping and
ejecting deactivation processed coal (upgraded coal) 3 is provided on a bottom
portion of the tip end side casing 112.
30 A projecting portion 104 having a ring shape is provided on the tip end side
and the base end side of an outer circumferential section of the rotary kiln body 103.
The projecting portion 104 is supported by a roller 105. A gear 106 engaging with a
gear 107a of a drive motor 107 is provided on the outer circumferential section of the
rotary kiln body 103. As a result, the rotary kiln body 103 is made to rotate by the
35 rotation of the gear 107a of the drive motor 107.
6
The above-described coal deactivation processing device 100 is further
equipped with a cooling device 140. The cooling device 140 is equipped with a
bearing 145 fixed to a side wall portion 103a of the tip end side of the rotary kiln
body 103. The cooling device 140 is equipped with a coolant feed header 141
feeding a coolant 21 from outside the system. The coolant feed header 141 i5 s
provided on the bearing 145. The coolant feed header 141 is connected to a feed pipe
142 feeding the coolant 21. The feed pipe 142 is provided in plurality (for example,
as a double pipe) with, for example, eight pipes being connected (see FIG. 2). The
cooling device 140 is equipped with a coolant ejection header 146 ejecting used
10 coolant 22 that has passed through the feed pipes 142 to outside the system.
The plurality of feed pipes 142 are arranged, as illustrated in FIG. 1 and FIG.
2, within the rotary kiln body 103 so as to neighbor each other with equal spacing
along a circumferential direction of the rotary kiln body 103. The plurality of feed
pipes 142 are arranged at respective positions so as to, upon rotation of the rotary
15 kiln body 103, pass through an accumulated coal layer of the coal 2 despite a fill
ratio of the coal 2 within the rotary kiln body 103 being from 10 to 15%, for
example. In addition, the plurality of feed pipes 142 are arranged such that a distance
D1 from a respective central axis C2 of each of the feed pipes 142 to a central axis
C1 of the rotary kiln body 103 is consistently equal . The plurality of feed pipes 142
20 extend in parallel to the central axis C1 of the rotary kiln body 103 within the rotary
kiln body 103, and extend across the rotary kiln body 103 from the tip end side to the
base end side. As a result, the temperature of a region where the coal 2 undergoes
deactivation processing by the processing gas 13 supplied within the rotary kiln body
103 is adjusted by the coolant 21 flowing within the feed pipes 142 to a temperature
25 at which spontaneous combustion of the coal 2 does not occur.
The plurality of feed pipes 142 are arranged so as to pass through the side
wall portion 103a of the rotary kiln body 103. The plurality of feed pipes 142 are
each supported by support jigs (not illustrated in the drawings) arranged at a
plurality of locations in a lengthwise direction. As a result, the plurality of feed pipes
30 142 are made to rotate along with the rotary kiln body 103 upon rotation of the
rotary kiln body 103.
Here, the parameters of the above-described feed pipes 142 are described with
reference to FIG. 2 and FIG. 3.
In FIG. 2, a direction of rotation A is a direction of rotation of the rotary kiln
35 body 103. A path L1 is followed by the central axis C2 of each of the plurality of
7
feed pipes 142, and a tangent line L2 is tangent to the path L1. An angle γ is an acute
angle formed by the tangent line L2 and a bisector line L3, described below. In FIG.
2 and FIG. 3, the bisector line L3 bisects a pair of blades 143, 144, described later.
In FIG. 3, a lateral symmetry line L4 indicates the symmetry of a coal layer surface
2a. A support line L11 passes through a point of contact P1 between one of the fee5 d
pipes 142 and the coal layer surface 2a and a point of contact P2 between the feed
pipe 142 and the lateral symmetry line L4 of the coal layer surface 2a. Support lines
L12, L13 respectively pass through the central axis C2 of the feed pipe 142 and the
points of contact P1, P2. Support lines L21, L22 respectively pass through the blades
10 144, 143 and the central axis C2 of the feed pipe 142. An angle α is an acute angle
formed by the bisector line L3 and the support line L21 (line extending from the
blade 144), and represents a blade angle. An angle β is an acute angle similarly
formed by the bisector line L3 and the support line L12. An angle of repose θ is also
indicated. Here, the support lines L11, L12, L13 form an isosceles triangle with the
15 central axis C2 at the vertex. Given that the support line L12 and the coal layer
surface layer 2a form a right angle, the angle β is thus equal to the angle of repose θ.
As illustrated in FIG. 2 and FIG. 3, the feed pipe 142 has a circular crosssection
in the radial direction. The blades 143, 144 are provided as a pair on the
outer circumferential section of the feed pipe 142 and protrude toward the radial
20 direction of the feed pipe 142. The pair of the blades 143, 144 are arranged at
respective positions so as to, similarly to the feed pipe 142, upon rotation of the
rotary kiln body 103, pass through the accumulated coal layer of the coal 2 despite
the fill ratio of the coal 2 within the rotary kiln body 103 being from 10 to 15%, for
example. The feed pipes 142 and the pair of the blades 143, 144 provided on each of
25 the feed pipes 142 are arranged such that the angle γ is from 0 to 40° . This is because
having the angle γ be smaller than 0° or greater than 40° prevents the coal 2 from
being lifted by the pair of blades 143, 144 higher than the coal layer surface 2a, such
that lifting of the coal 2 is only possible for the feed pipes 142. As a result, the
volume of coal lifted higher than the coal layer surface 2a by the feed pipes 142 and
30 by the pair of blades 143, 144 may be increased in comparison to a situation in
which no blades are provided, and the coal dropped onto the coal layer surface 2a
from above may be brought into contact with the processing gas 13 in a more
efficient manner.
The feed pipes 142 and the pair of blades 143, 144 provided on each of the
35 feed pipes 142 are preferably arranged such that the angle γ is equal to the angle of
repose θ. This is because having the angle γ and the angle of repose θ be equal (see
8
FIG. 3) maximizes the volume of the coal lifted higher than the coal layer surface 2a
by the feed pipes 142 and by the pair of blades 143, 144, and enables a maximum
benefit of efficiently bringing the coal 2 and the processing gas 13 into contact,
which is caused by the angle γ.
Furthermore, the pair of blades 143, 144 are preferably arranged such that th5 e
angle (the blade angle) α is greater than the angle of repose θ. This is because having
the angle (the blade angle) α be smaller than the angle of repose correspondingly
decreases the volume of the coal lifted higher than the coal layer surface 2a by the
feed pipes 142 and by the pair of blades 143, 144, and this prevents the coal 2 and
10 the processing gas 13 from being brought into contact in an efficient manner.
The angle (the blade angle) α is preferably from 45 to 85°, and is more
preferably from 55 to 75°. This is because having the angle (the blade angle) α be
outside this range correspondingly decreases the volume of the coal lifted higher
than the coal layer surface 2a by the feed pipes 142 and by the pair of blades 143,
15 144, and this prevents the coal 2 and the processing gas 13 from being brought into
contact in an efficient manner.
A minimum length Hmin of each of the blades 143, 144 in the radial direction
of the corresponding feed pipe 142 is preferably from 5 to 45%, and more preferably
from 10 to 35%, of the radius of the feed pipe 142. This is because having the
20 minimum length Hmin of the blades 143, 144 be below this lower limit causes the
volume of the coal lifted by the feed pipes 142 and by the pair of blades 143, 144 to
be similar to a situation in which the blades 143, 144 are not provided. As such, this
prevents the volume of the coal lifted higher than the coal layer surface 2a by the
blades 143, 144 from being increased, such that no improvement to the efficiency of
25 bringing the coal 2 and the processing gas 13 into contact is possible . Conversely,
having the minimum length Hmin of the blades 143, 144 be above this upper limit
causes the volume of the coal lifted by the feed pipes 142 and by the pair of blades
143, 144 to be greater and as such increases a load imposed on the feed pipes 142
themselves and on connecting portions of the feed pipes 142 and the blades 143, 144.
30 Furthermore, the above-described coal deactivation processing device 100
preferably satisfies the relationship of formula (1) given below, where a given feed
pipe 142 has a radius r2 and a distance D1 is defined from the central axis C1 of the
rotary kiln body 103 to the central axis C2 of the given feed pipe 142.
1/50 D1 < r2 < 1/10 D1 ∙∙∙(1)
9
In a situation where the radius r2 of the feed pipe 142 is equal to or greater
than 1/10 D1 (one-tenth of D1), the pipe diameter of the feed pipe 142 is overly large
in comparison to the thickness of the coal layer within the rotary kiln body 103.
Given that the flow of the coal 2 is increased, this leads to the promotion of
pulverization of the coal 2. Conversely, in a situation where the radius r2 of the fee5 d
pipe 142 is equal to or less than 1/50 D1 (one-fiftieth of D1), the feed pipe 142 is
narrow and heat exchange is not possible unless many of the feed pipes 142 are
arranged in the layer of the coal 2. This not only increases equipment costs, but also
increases the supply pressure of the coolant 21 supplied to the feed pipes 142, and
10 consumes a greater amount of power. As a result, satisfying formula (1), given
above, enables pulverization of the coal 2 to be constrained, and also enables
equipment cost increases and power consumption increases to be constrained.
2r2 < D3 < 6r2 ∙∙∙(2)
In a situation where a distance D3 between neighboring feed pipes 142, 142 is
15 equal to or less than 2r2 (twice the radius r2 of each of the feed pipes 142), then the
neighboring feed pipes 142, 142 are too close to each other and the coal 2 may
bridge the space between the neighboring feed pipes 142, 142. Conversely, in a
situation where the distance D3 between the neighboring feed pipes 142, 142 is equal
to or greater than 6r2 (six times the radius r2 of each of the feed pipes 142), then a
20 heat transfer surface area between the coolant 21 within the feed pipes 142 and the
coal 2 is reduced and as such, the cooling heat transfer surface area may not be
secured for the coal 2. Thus, satisfying formula (2), given above, enables the
occurrence of bridging of the space between the neighboring feed pipes 142, 142 to
be constrained and enables the cooling heat transfer surface area of the coolant 21
25 within the feed pipes 142 to be secured for the coal 2.
In the present embodiment, the processing gas supply pipe 121, the heating
device 128, the blower 127, the air supply pipe 122, the flow rate regulation valve
125, the nitrogen supply pipe 123, the flow rate regulation valve 126, the nitrogen
supply source 124, the base end side casing 111, the gas intake aperture 111a, and the
30 like constitute processing gas supply means. The coolant feed header 141, the feed
pipe 142, the blades 143, 144, the bearing 145, the coolant ejection header 146, and
the like constitute the cooling device 140, which serves as cooling means. The
projecting portion 104, the roller 105, the gear 106, the drive motor 107, the gear
107a, and the like constitute rotation means. The hopper 101, the screw feeder 102,
35 and the like constitute coal supply means. The chute 112b of the tip end side casing
112 and the like constitute coal ejection means. The tip end side casing 112, the gas
10
ejection aperture 112a, the processing gas ejection pipe 131, and the like constitute
processing gas ejection means. Each of these means and the rotary kiln body 103, the
sealing devices 108, 109a, 109b, and the like constitute the coal deactivation
processing device 100.
Operations centered on the coal deactivation processing device 100 ar5 e
described next.
Upon being supplied to the hopper 101, the coal 1 is transported by the screw
feeder 102 within the rotary kiln body 103. At the other end, the air 11 and the
nitrogen gas 12 are supplied to the processing gas supply pipe 121 via the air supply
10 pipe 122 and the nitrogen supply pipe 123 by controlling a degree of aperture of the
flow rate regulation valves 125, 126 while controlling the operation of the blower
127. As a result, the processing gas 13 is obtained by combining the air 11 and the
nitrogen gas 12 (for example, with an oxygen concentration on the orde r of from 5 to
10%). The processing gas 13 is heated by the heating device 128 in accordance with
15 temperature data of the used processing gas 14 obtained by the temperature sensor
131a so that the temperature inside the rotary kiln body 103 is adjusted to within a
range of from 40 to 200°C. The processing gas 13 is then supplied within the rotary
kiln body 103 by the processing gas supply pipe 121 via the gas intake aperture 111a.
The rotary kiln body 103 is driven to rotate by the rotation of the gear 107a of
20 the drive motor 107 being transmitted via the gear 106. The coal 2 transported within
the rotary kiln body 103 along with the rotation of the rotary kiln body 103 is
displaced from the base end side to the tip end side of the rotary kiln body 103 while
being agitated. At this time, the coal 2 within the rotary kiln body 103 adsorbs the
oxygen in the processing gas 13 supplied within the rotary kiln body 103. The coal 2
25 thus becomes the deactivation processed coal (upgraded coal) 3 as a result of this
oxygen adsorption, and is then transported to outside the system via the chute 112b.
The coal 2 in the rotary kiln body 103 produces heat by adsorbing the oxygen in the
processing gas 13. The temperature is therefore adjusted by the flow of the coolant
21 within the feed pipes 142 to a temperature at which spontaneous combustion of
30 the coal 2 does not occur.
The used processing gas (approximately from 50 to 70°C) 14 that has been
used in the deactivation processing of the coal 2 within the rotary kiln body 103
flows in the same direction as the direction of transport of the coal 2. The used
processing gas 14 flows from the gas ejection aperture 112a of the tip end side
35 casing 112 provided on the tip end side of the rotary kiln body 103 to the processing
11
gas ejection pipe 131, and is ejected outside the system via the processing gas
ejection pipe 131.
Here, in the above-described coal deactivation processing device 100, the
plurality of feed pipes 142 are provided within the rotary kiln body 103 so as to
rotate about the central axis C1 of the rotary kiln body 103 along with the rotary kil5 n
body 103 upon rotation of the rotary kiln body 103 so as to pass through the
accumulated coal layer of the coal 2 supplied to the rotary kiln body 103, and the
pair of blades 143, 144 are provided on each of the feed pipes 142. Given the various
parameters described above, the following operations are further obtained.
10 That is, in the present embodiment, the plurality of feed pipes 142 are driven
to rotate about the central axis C1 of the rotary kiln body 103 along with the rotation
of the rotary kiln body 103. Also, upon passing through the coal layer, the coal 2 is
lifted by the feed pipes 142 and the respective pairs of blades 143, 144 higher than
the coal layer surface 2a. Thus, each pair of blades 143, 144 is made to lift the coal 2
15 within a range that is wider than the region in which the coal is lifted at the angle of
repose θ.
As a result, according to the coal deactivation processing device 100
pertaining to the present embodiment, each of the feed pipes 142 and the pairs of
blades 143, 144 are arranged so as to pass through the accumulated coal layer of the
20 coal 2 within the rotary kiln body 103 upon rotation of the rotary kiln body 103, and
are disposed such that the angle γ formed by the tangent line L2 of the path along
which the central axis C2 of each of the feed pipes 142 pass and the bisector line L3
of the respective pairs of blades 143, 144 is from 0 to 40°. As such, the coal 2 is
agitated by the rotation of the rotary kiln body 103 while the coal 2 is also cooled by
25 the coolant 21 flowing in the feed pipes 142. In addition, a predetermined volume of
the coal 2 is lifted up by the feed pipes 142 and the blades 143, 144 higher than the
coal layer surface 2a within the rotary kiln body 103 and dropped from above, thus
enabling agitation of the coal 2 and bringing the coal 2 and the processing gas 13
into contact in an efficient manner. As a result, the spontaneous combustion of the
30 coal 2 may be prevented while causing oxygen to be adsorbed to the surface of the
coal 2 in an efficient manner. As such, in comparison to a situation in which the
blades are not provided on the feed pipes, the overall length of the rotary kiln body
103 may be made shorter, thus enabling miniaturization of the device.
35
12
[Other Embodiments]
Here, the blade angle α of the pair of blades 143, 144 provided on each of the
plurality of feed pipes 142 is not limited to a single type. Two or more types of
angles may be used in the coal deactivation processing device.
The coal deactivation processing device 100 has been described above a5 s
being equipped with eight of the feed pipes 142. However, the quantity of the feed
pipes is not limited to eight. The coal deactivation processing device may also be
equipped with seven or fewer and with nine or more of the feed pipes.
13
Reference Signs List
1, 2, 3 Coal
11 Air
12 Nitrogen gas
13, 14 Processing ga5 s
21, 22 Coolant
100 Coal deactivation processing device
101 Hopper
102 Screw feeder
10 103 Rotary kiln body (Kiln body)
104 Projecting portion
105 Roller
106 Gear
107 Drive motor
15 107a Gear
108 Sealing device
109a, 109b Sealing device
111 Base end side casing
111a Gas intake aperture
20 112 Tip end side casing
112a Gas ejection aperture
112b Chute
121 Processing gas supply pipe
122 Air supply pipe
25 123 Nitrogen supply pipe
124 Nitrogen supply source
125, 126 Flow rate regulation valve
127 Blower
128 Heating device
30 131 Processing gas ejection pipe
131a Temperature sensor
140 Cooling device
141 Coolant feed header
142 Feed pipe
35 143, 144 Blade
145 Bearing
146 Coolant ejection header
14
A Rotation direction of rotary kiln body
C1 Central axis of rotary kiln body
C2 Central axis of feed pipe
D1 Distance between central axis of rotary kiln body and central axis of feed pipe
D3 Distance between neighboring feed pipe5 s
Hmin Minimum blade length
L1 Path of central axis of feed pipe
L2 Tangent line of path of central axis of feed pipe
L3 Bisector line of pair of blades
10 L4 Lateral symmetry line of coal layer surface
L11 Support line
L12, L13 Radial direction line of feed pipe
L21 L22 Support line of blade
P1, P2 Point of contact
15 r1 Radius of rotary kiln body
r2 Radius of feed pipe
α Blade angle
θ Angle of repose
β Angle between line L3 and line L12

CLAIMS:
1. A coal deactivation processing device performing deactivation of coal with a
processing gas that includes oxygen, comprising:
a kiln body provided rotatably into which the coal and the processin5 g
gas are supplied; and
a feed pipe provided so as to be able to rotate along with the kiln body,
extending along a lengthwise direction of the kiln body, and having a coolant
flowing therein,
10 a pair of blades being provided on an outer circumferential section of the feed pipe and protruding in a radial direction, and
the feed pipe and the pair of blades being arranged so as to pass
through an accumulated coal layer of the coal within the kiln body upon
rotation of the kiln body, and such that an angle formed by a tangent line of a
15 path along which a central axis of the feed pipe passes and a bisector line of
the pair blades is from 0 to 40°.
2. The coal deactivation processing device according to claim 1, wherein
the pair of blades is arranged such that a blade angle formed by one
20 blade of the pair of blades and the bisector line of the pair of blades i s greater
than an angle of repose.
3. The coal deactivation processing device according to claim 2, wherein
the blade angle is from 45 to 85°.
25
4. The coal deactivation processing device according to any one of claim 1 to
claim 3, wherein
a minimum blade length in the radial direction of the feed pipe is from
5 to 45% of a radius of the feed pipe.