KR101919071B1 - Horizontal rotary dryer for coal, coal boiler plant, and method for operating coal boiler plant - Google Patents

Abstract

[PROBLEMS] To provide a coarse rotary dryer of coal capable of changing pulverized coal to be removed according to the type of coal. The present invention is directed to a method of producing a coal having a supply port 41 of a coal C1 and a supply port 41 of a carrier gas G1 at one end and a dry carbon C2 and an exhaust port 50 of exhaust gas at the other end, A heating means 11 for heating the coal C1 in the rotary kiln 10; a heating means 11 for heating the coal C1 in the rotary kiln 10; And a classification hood 55 having a fixed exhaust port 57 for exhaust gas G2 is provided in the ceiling portion 55u. An ascending flow generating means 58 for generating an ascending flow in the classification hood 55 and a flow control means 14 for controlling the flow rate of the ascending flow are provided, Is discharged from the fixed exhaust port (56).

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coal rotary dryer, a coal boiler facility, and a coal boiler facility,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a horizontal rotary dryer of coal, a coal boiler facility equipped with the horizontal rotary dryer, and a method of operating the coal boiler facility.

In factories such as thermal power plants, sugar factories, and pulp factories, boilers are used to generate steam by heating water, and coal is used as part or all of the fuel. This coal is sometimes used in the form of coal such as lignite or bituminous coal because of its low cost. In addition, the coal is crushed by a crusher such as a roller mill and then burned as a burner attached to the boiler. However, when the water-containing coal is used as the fuel as it is, a part of the calorific value is lost due to the evaporation of water contained in the coal, so that the amount of steam generated in the boiler is reduced. Therefore, at present, coal is preliminarily dried with a drier and then pulverized by a crusher to be used as fuel. However, coal such as lignite and sub-bituminous coal generates fine powder when cracked due to drying, so dry coal contains a lot of pulverized coal. For example, when coal having a moisture content of about 60% is dried to a moisture content of about 10%, pulverized coal (fine particles) having a size of 300 탆 or less, which is only about 2%, increases to about 10%. Therefore, when the dry charcoal is transported, the pulverized coal must be prevented from scattering, which causes a problem that the handling property is poor. In addition, since the pulverized coal which does not need to be pulverized is pulverized by the pulverizer, there arises a problem that the pulverization efficiency is poor. Particularly, when the pulverizer is a roller mill or the like, if the amount of pulverized coal is large, vibration may occur and the operation may become unstable. Therefore, in order to solve such a problem, it is necessary to remove the pulverized coal in the dry coal by sending it to the classifier before pulverizing the dry coal by the pulverizer.

On the other hand, a horizontal type rotary dryer is known as a dryer for coal, and a representative example thereof is a so-called steam tube dryer (STD) (see, for example, Patent Document 1). 11, the steam tube dryer includes a rotor 110 rotating around a central axis and a plurality of heating tubes 111 arranged in the axial direction of the rotor 110 And a heating medium such as steam is allowed to pass through the heating tube 111. The coal supplied (charged) from one end of the rotary 110 is conveyed to the other end in accordance with the rotation of the rotary 110, and is heated by contacting the heating pipe 111 in this conveying process. The dry charcoal dried by this heating is discharged from the discharge port 112 formed on the other end side of the rotary drum 110. A carrier gas outlet 113 is formed at one end of the rotating body 110 and is connected to a discharge port formed at the other end of the rotating body 110 along with gas such as steam generated in the rotating body 110 112 which communicate with the exhaust port 122. This steam tube dryer is very useful because it has many advantages in addition to stable drying of coal. However, this conventional steam tube dryer can not remove the pulverized coal in the dry coal. Therefore, in order to avoid the problem caused by the above-mentioned pulverized coal, it is necessary to separately provide a classifier even when the coal is pre-dried by using the conventional steam tube dryer.

Therefore, it is conceivable to use a horizontal rotary dryer having a classifying function proposed by the present applicant as a dryer for coal (see Patent Document 2). This horizontal type rotary dryer has a structure in which pulverized coal is discharged together with exhaust gas to remove it from dry charcoal and can be used for drying coal supplied to the coke furnace, have. However, coal has different burning rates depending on the types of lignite, bituminous coal, etc. Therefore, the degree of crushing by the crusher is changed according to the burning rate. For example, when lignite and bituminous coal are compared, since bituminous coal has a large amount of fixed carbon and a small amount of volatile components, the burning rate is slow, so that bituminous coal is pulverized to a size smaller than that of lignite Needs to be. However, the lateral type rotary dryer is for removing pulverized coal to prevent dust generation, carbon adhesion, etc., and it is not a problem to change the size of pulverized coal to be removed depending on the type of coal. Therefore, for example, when the horizontal rotary dryer is designed and used on the assumption that the coal is lignite, when the coal is the bituminous coal, the pulverized coal larger than the pulverized coal after the pulverization is removed. Of course, the removed pulverized coal can be used as fuel, but pulverized coal needs to be pulverized separately because it contains pulverized coal larger than pulverized coal after pulverization. On the other hand, if the dryer is designed and used assuming that the coal is bituminous coal, if the coal is lignite, a part of the coarse coal smaller than the crushed coal after the crushing can not be removed from the dried coal. Therefore, the pulverized coal which does not need to be pulverized is pulverized by the pulverizer, and the pulverization efficiency is lowered.

Patent Document 1: JP-A-2004-44876 Patent Document 2: JP-A-2010-169324

The main object of the present invention is to provide a horizontal rotary dryer of coal, a coal boiler facility equipped with the horizontal rotary dryer, and a method of operating the coal boiler facility, which can change the pulverized coal to be removed depending on the kind of coal .

When fine powders (fine particles) are present in the ascending stream, the large pulverized coal is lowered (dropped) by gravity, but the small pulverized coal is piled up in the ascending flow. The inventors of the present invention conducted various tests on the premise that the degree of pulverization of the pulverized coal at a certain rate in the case of changing the flow rate of the ascending flow and discharging the pulverized coal from the (fixed) found. This figure shows how the slip rate changes when the flow velocity u of the ascending flow is changed with respect to the pulverized coal having the size of falling or rising when the flow rate of the ascending flow is ut. The slip rate is a ratio of pulverized coal discharged from a fixed exhaust port, and the higher the slip rate, the greater the percentage of pulverized coal to be removed. The change of the slip rate (the shape of the curve) changes depending on the shape of the classification hood, the internal structure, and the like. Therefore, it has been found that the ratio of the fine powder to be removed and the particle diameter distribution can be controlled by changing the flow velocity (u), and the inventors of the present invention have succeeded in overcoming the following problems that solve the above problems.

[Invention according to claim 1]

A coal feed port and a carrier gas feed port are provided at one end and a rotary passage and an exhaust port for dry coal and exhaust gas are provided at the other end,

A heating means for heating the coal in the rotary kiln,

A classifying hood having a fixed outlet of the dry coal at the bottom and a fixed outlet of the exhaust gas in the ceiling,

A horizontal rotary dryer of coal, comprising:

A rising flow generating means for generating a rising flow in the classification hood,

And a flow rate control means for controlling the flow rate of the ascending flow,
A sedimentation area is formed in an upper portion of the classification hood above the cyclone,
In the sedimentation region, the classification hood is configured to be widened in the axial direction of the rotary shaft,

A part or all of the pulverized coal in the dry charcoal is discharged from the fixed discharge port

Wherein the drying device is a rotary type dryer of coal.

(Main effect)

Up flow rate generating means for generating a rising flow in the classification hood and a flow rate control means for controlling the flow rate of the ascending flow are provided in the classification hood so that the ratio or the particle size distribution of the fine coal discharged from the fixed exhaust port can be controlled, The pulverized coal to be removed can be changed.

[Invention according to claim 2]

A coal boiler facility having a coal dryer, a dry coal pulverizer dried by the dryer, and a boiler using pulverized coal pulverized by the pulverizer,

A coal feed port and a carrier gas feed port are provided at one end and a rotary passage and an exhaust port for dry coal and exhaust gas are provided at the other end,

A heating means for heating the coal in the rotary kiln,

A classification hood covering the discharge port, having a fixed discharge port of dry coal at the bottom, and a fixed discharge port of exhaust gas in the ceiling portion,

A rising flow generating means for generating a rising flow in the classification hood,

And a flow rate control means for controlling the flow rate of the ascending flow,
A sedimentation area is formed in an upper portion of the classification hood above the cyclone,
In the sedimentation region, the classification hood is configured to be widened in the axial direction of the rotary shaft,

And a horizontal rotary dryer for discharging part or all of the pulverized coal in the dry coal from the fixed outlet by the upward flow is used as the dryer,

The dry coal discharged from the stationary discharge port of the horizontal type rotary dryer is crushed by the crusher and then used as fuel for the boiler,

On the other hand, the pulverized coal discharged from the fixed exhaust port of the transverse rotary dryer is collected,

A coal boiler facility.

(Main effect)

Up flow generating means for generating a rising flow in the classification hood and a flow rate control means for controlling the flow rate of the ascending flow are provided. Therefore, when the dry coal discharged from the fixed discharge port is pulverized by the pulverizer, it is possible to prevent the problem caused by the above-mentioned pulverized coal, which is related to the handling property, the pulverization efficiency, and the like. In addition, since the pulverized coal discharged from the fixed exhaust port can be made appropriate for the type of coal, the pulverized coal can be collected as it is and can be used as the fuel for the boiler.

[Invention according to claim 3]

As the rising flow generating means, a dispersion gas blowing means for blowing up the dispersion gas from the bottom of the classification hood is provided,

Wherein at least one of the carrier gas and the dispersion gas is discharged from the fixed exhaust port and at least one of the exhaust gas after the pulverized coal is collected and the exhaust gas of the boiler is used,

The coal boiler facility according to claim 2.

(Main effect)

At least one of a carrier gas and a dispersed gas, at least one of an exhaust gas discharged from a fixed exhaust port, a particulate carbon dust collecting chamber, and an exhaust gas of a boiler is used, so that the thermal efficiency is excellent. Further, since such an exhaust gas has a low oxygen concentration, an explosion of coal dust can be prevented.

[Invention according to claim 4]

As a method of operating a coal boiler facility having a coal dryer, a dry coal grinder that is dried by the dryer, and a boiler using a pulverized coal pulverized by the grinder,

A coal feed port and a carrier gas feed port are provided at one end and a rotary passage and an exhaust port for dry coal and exhaust gas are provided at the other end,

A heating means for heating the coal in the rotary kiln,

A classifying hood having a fixed outlet of the dry coal at the bottom portion and a fixed outlet of the exhaust gas in the ceiling portion,
A sedimentation area is formed in an upper portion of the classification hood above the cyclone,
A horizontal rotary type dryer in which the classification hood is widened in an axial direction of the rotary kiln in the settling region is used as the dryer,

And controlling the flow rate of the ascending flow of the pulverized coal to be discharged when part or all of the pulverized coal in the dried coal is discharged from the fixed discharge port by generating a rising flow in the classification hood,

The dry coal discharged from the stationary discharge port of the horizontal rotary dryer is crushed by the crusher and then used as fuel for the boiler.

Meanwhile, the pulverized coal discharged from the fixed exhaust port of the transverse rotary dryer is collected and used as fuel for the boiler

Wherein the operation of the coal boiler facility is controlled by the control unit.

(Main effect)

When a part or all of the pulverized coal in the dry coal is discharged from the fixed exhaust port by generating a rising flow in the classification hood, the discharged pulverized coal is controlled by controlling the flow rate of the ascending flow so that the same function and effect as the invention described in claim 2 is obtained .

According to the present invention, there is provided a horizontal rotary dryer of coal, a coal boiler facility equipped with the horizontal rotary dryer, and a method of operating the coal boiler facility, which can change the pulverized coal to be removed depending on the type of coal.

Fig. 1 is a facility flow chart of the coal boiler facility of this embodiment.
2 is a front view of the horizontal rotary dryer of the present embodiment.
Fig. 3 is an enlarged view of the other end side of the spinneret, in which the classification hood is omitted.
4 is a sectional view taken along the line XX in Fig.
5 is an enlarged view of the classification hood.
6 is an enlarged view of the dispersion gas blowing means.
7 is an explanatory diagram of the dispersion gas blowing means.
8 is a modification of the classifying hood and the dispersing gas blowing means.
9 is a modification of the classifying hood and the dispersing gas blowing means.
10 is a graph showing the relationship between the change of the flow velocity and the slip rate.
11 is a perspective view of a conventional steam tube dryer.

Next, a mode for carrying out the present invention will be described.

(Coal boiler facility)

Fig. 1 shows an equipment flow chart of the coal boiler facility of this embodiment. The coal boiler system of this embodiment comprises a horizontal rotary dryer 100, a crusher 120 of a dry charcoal C2 dried by the horizontal rotary dryer 100, and a crushed coal C3 crushed by the crusher 120 And a boiler 130 supplied as fuel. The term "crushed coal" means a dry coal after being pulverized by a crusher, and is not distinguished from a pulp because it has a different particle diameter from that of "pulverized coal"

The horizontal rotary dryer 100 has a supply port for the coal C1 and a supply port for the carrier gas G1 made of lignite and bituminous coal on one end side (left side of the drawing) And a discharge port 50 of the exhaust gas G2 (see Fig. 3), heating means for heating the coal C1 in the rotator 10, And a classification hood 55 for covering the discharge port 50 of the exhaust gas G2. The details of the lateral type rotary dryer 100 will be described later.

The carrier gas G1 is blown (supplied) into the rotator 10 by the blower 113 and exhausted from the rotator 10 as exhaust gas together with steam generated by the heating of the coal C1 . Examples of the carrier gas G1 include any one of an exhaust gas G3 of the boiler 130, an inert gas such as nitrogen, an exhaust gas G4 after the particulate matter C4 is collected (removed) A gas obtained by appropriately combining these can be used. However, it is necessary to keep the oxygen concentration of the carrier gas G1 low (usually 13% or less, preferably 12% or less) in order to prevent the burning explosion in the lateral type rotary dryer 100. [ Therefore, it is preferable to use at least one of the exhaust gas G3 and the exhaust gas G4 as the carrier gas G1. Both the exhaust gases G3 and G4 have a low oxygen concentration and a high temperature, so that there is no fear that heating of the coal (C1) will be hindered even if used as the carrier gas (G1). The oxygen concentration of the exhaust gas may be measured (monitored). When the measured value exceeds the specified value, the oxygen concentration may be controlled by mixing the inert gas or increasing the amount of the mixed gas. Further, in the illustrated example, the exhaust gas G4 after the pulverized coal C4 is collected is discharged from the stack 160 to the atmosphere.

The dry charcoal C2 is discharged from the rotary kiln 10 into the classification hood 55 and then discharged through the fixed discharge port 57 provided at the bottom (lower portion) of the classification hood 55 2), and is conveyed to the feed hopper 121 of the crusher 120 by conveying means such as a belt conveyor. However, in this embodiment, the blowing means 58 of the dispersing gas N is provided as a rising flow generating means for generating a rising flow in the classification hood 55, and the desired pulverized coal C4 is supplied to the dry coal C2 (See FIG. 2) provided in the ceiling portion (upper portion) of the classifying hood 55. [0086] Therefore, the dry charcoal C2 conveyed to the supply hopper 121 does not contain the pulverized coal C4, and thus the handling property is excellent.

In this embodiment, the dispersing gas N is directly blown into the classifying hood 55 by the blower 113 used for blowing the carrier gas G1. A control valve 14 is provided on the flow path of the dispersing gas N. The flow rate of the dispersing gas N is controlled by controlling the opening degree (opening degree) of the control valve 14, 55 are controlled. As described above, in this embodiment, the control valve 14 functions as a flow rate control means for controlling the flow rate of the ascending flow, but a blower different from the blower 113 of the carrier gas G1 is provided, It can be done by means. When the blower is separately provided as described above, a gas of the same kind as that of the carrier gas (G1) or a different kind of gas can be used as the dispersion gas (N), but it is preferable to use the same kind of gas from the viewpoint of process stability.

The pulverized coal C4 raised to the ceiling portion by the ascending current in the classification hood 55 is discharged together with the exhaust gas G2 from the fixed exhaust port 56 provided in the ceiling portion of the classification hood 55, ). The pulverized coal C4 collected by the dust collector 140 is conveyed to the pulverized coal hopper 150 and temporarily stored. The pulverized coal C4 stored in the pulverized coal hopper 150 is supplied to the burner 132 attached to the boiler 130 as needed and burned. The supply of the pulverized coal C4 may be performed, for example, by air transportation. In the illustrated example, a flow (air flow) of the air A1 is formed by the blower 114, and the pulverized coal C4 is conveyed along the air flow.

On the other hand, the dry charcoal C2 which is transported to the supply hopper 121 and temporarily stored is crushed by the crusher 120 and pulverized. The fine pulverized coal (C3) is supplied to the burner 131 attached to the boiler 130 and burned. In this embodiment, since the pulverized coal C4 is removed from the dried charcoal C2, pulverization by the pulverizer 120 is very efficient. Further, even when the roller mill is used as the crusher 120, there is little possibility that the operation becomes unstable due to vibration. The degree of pulverization of the dried charcoal (C2) in the pulverizer (120) can be appropriately determined based on the type of coal, the burning rate by the burner (131), and the like. For example, when the coal (C1) is lignite, the burning speed by the burner (131) is relatively fast, so that the degree of fine pulverization can be made rough. On the other hand, when the coal (C1) is a bituminous coal, since the burning rate in the burner (131) is relatively slow, it is necessary to finely grind the coal.

(Horizontal rotary dryer)

Next, the lateral type rotary dryer 100 will be described in detail.

Fig. 2 shows a lateral type rotary dryer 100 of the present embodiment. The horizontal rotary dryer of the present embodiment has a cylindrical rotary body 10. In this rotary machine 10, the length in the axial direction is, for example, 10 to 30 m. The shaft 10 is provided such that its axis is slightly inclined with respect to the horizontal plane so that one end side (left side in the figure) of the rotator 10 is higher than the other end side (right side in the drawing). Two support units 20 and a motor unit 30 are provided below the rotary 10 to support the rotary 10. The rotary unit 10 is rotatable around its own axis by the motor unit 30. 4, rotates in the counterclockwise direction (arrow R direction) in one direction. The rotational speed is not particularly limited, but is usually less than 1 m / s at a peripheral speed.

A plurality of steam tubes (heating tubes) 11 are mounted inside the rotor 10 so as to extend along the axial direction of the rotor 10. The steam tube 11 is made of, for example, a metal pipe, and a heating medium such as steam flows through the steam tube 11. The plurality of steam tubes 11 may be arranged in the circumferential direction and in the radial direction so as to be concentric with the axis of the rotor 10, for example.

As shown in Fig. 3, a plurality of discharge ports 50 are formed in the peripheral wall of the other end of the rotor 10. The dry charcoal C2 and the exhaust gas are discharged and exhausted from the rotating body 10 through the plurality of outlets 50. A plurality of outlets (50) are arranged at appropriate intervals in the circumferential direction of the rotor (10) to form a row along the circumferential direction. In the illustrated example, the columns are two columns, but a plurality of columns of one column or three or more columns may be used. In the illustrated example, each of the outlets 50 has a rectangular shape of the same shape, but may have another shape or a shape other than a rectangle such as a circle.

4, a plurality of scraping plates 61 extending from the inner wall of the rotor 10 toward the axis of the rotor 10 are provided in the rotor 10. As shown in Fig. 2, the plurality of scraping plates 61 are spaced apart in the axial direction of the rotor 10, and are arranged so as to form a plurality of rows, three rows in the illustrated example. As shown in Fig. 4, each scraped plate array 60 is constituted by a plurality of scraping plates 61, which are separated from each other at equal intervals, in the illustrated example. Each raking plate 61 is formed of a thick metal and has a hooked shape bent toward the front side in the rotation direction R of the rotator 10. The length along which the scraping plate 61 extends can be, for example, 1/10 to 3/10 of the inner diameter D of the rotor 10. Each raking plate 61 passes through the front side end portion of the discharge port 50 positioned on the rear side of the rotation direction R of the rotator 10, And extends from the vicinity of a straight line forming a parallel line. Therefore, there is no discharge port 50 in the vicinity of the straight line on the front side of the scraping plate 61, and the inner wall of the rotator 10 is present. 2, the scraped plate array 60 is arranged between the discharge port 50 and the supply port 41 to be described later in the rotator 10, 10). The scraped plate heat 60 is disposed in a portion near the discharge port 50 between the discharge port 50 and the supply port 41.

2, a coal (C1) supplied (charged) to the inside of the spinneret 10 is agitated at one end side of the spinneret 10, rather than the scraped plate heat 60 inside the spinneret 10 The agitating means 65 is provided. This agitating means 65 is also separated from the scraped plate heat 60 arranged at the most one end inside the rotator 10. As the stirring means 65, for example, a well-known stud type or reverse blade can be used. Particularly, it is preferable to select the reverse blade for the reasons such as the effect of pulverized coal separation (dispersion), the volume specific gravity is reduced by drying, and the filling rate of dry charcoal with reduced volume is increased.

2 and 5, a drying hood C2 and a classification hood 55 capable of discharging the exhaust gas G2 are provided in the rotary kiln 10 so as to cover the other end side having a plurality of outlets 50 Is installed. As shown in Fig. 5, the classification hood 55 is made of a thick metal, and the classification hood 55 is made of a metal such as a granule of a dry charcoal C2, which is dried and classified (removal of the pulverized coal C4) And has a fixed exhaust port 57 and a fixed exhaust port 56 of exhaust gas G2 on a ceiling of a ceiling portion (upper portion) 55u. 4, the classification hood 55 is narrowed in width as the ceiling portion 55u faces the fixed exhaust port 56 in the width direction orthogonal to the axial direction of the rotator 10, Similarly, the width of the bottom portion 55d becomes narrower toward the fixed discharge port 57 in the width direction. The stationary exhaust port 56 and the stationary exhaust port 57 are located approximately at the center of the classification hood 55 when seen in plan view. The sedimentation area 90 in the classification hood 55 above the rotary kiln 10 (indicated by the letter L) is a space filled with the exhaust gas from the rotary kiln 10 and the dispersing gas N. That is, the classification hood 55 is provided so as to form a sedimentation region 90 above the rotating furnace 10. Further, the classifying hood 55 is fixed to the paper surface by means not shown, and is not rotated in accordance with the rotation of the rotator 10.

The fixed exhaust port 56 is open in the vertical direction and is connected to the dust collecting means 140 described above. The exhaust gas G2 containing steam generated by the drying of the carrier gas G1 and the coal C1, the dispersing gas N and the pulverized coal C4 is discharged from the fixed exhaust port 56. On the other hand, the fixed discharge port 57 is also vertically opened and connected to the supply hopper 121 of the crusher 120. The dry coal C2 after the pulverized coal C4 is classified and removed is discharged from the fixed discharge port 57. [

The lateral type rotary dryer 100 of the present embodiment controls the distribution and amount of the particle size distribution of the pulverized coal C4 discharged from the fixed discharge port 56 by generating a rising flow in the classification hood 55 and controlling the flow rate of this rising flow. . However, by controlling the distance L between the upper edge of the rotator 10 and the fixed exhaust 56, it is possible to control the particle size distribution and amount more appropriately. Specifically, if the separation distance L is shortened, the overall slip rate increases, but the pulverized coal C4 having a relatively large diameter is increased. Therefore, when the separation distance L is shortened, the pulverized coal C4 discharged from the fixed discharge port 56 has a higher particle diameter distribution on the large diameter side. On the other hand, if the separation distance L is increased, the overall slip rate is lowered, but the rate of reduction is larger for the pulverized coal C4 having a relatively small diameter. Therefore, when the separation distance L is increased, the pulverized coal C4 discharged from the fixed discharge port 56 has a lower particle diameter distribution on the small diameter side. Considering such circumstances, the distance L is L> 0.3D, preferably 0.8D <L <4.0D, more preferably 1.0D <L <2.5D, relative to the inner diameter D of the rotator 10 D. 4 from the viewpoint of adjusting the particle diameter distribution of the pulverized coal C4 discharged from the fixed discharge port 56, the inner wall surface 55a of the classification hood 55, It is preferable to mount one or a plurality of baffle plates 91 on the inner wall surface 55a of the classification hood 55 constituting the baffle plate 90. Diameter pulverized coal colliding with the obstruction plate 91 falls and is discharged from the fixed discharge port 57 as it is. On the other hand, the small diameter pulverized coal colliding with the obstruction plate 91 is once dropped, but a part of the pulverized coal is raised again by the upward flow. Therefore, the particle size distribution of the pulverized coal C4 discharged from the fixed exhaust port 56 shows a low value on the large diameter side.

5, in the sedimentation region 90, the classification hood 55 is widened in the axial direction of the rotator 10. When the classification hood 55 is widened in the axial direction in the sedimentation region 90, collision between the pulverized coal and the pulverized coal and the classification hood 55 (in particular, the wall materials 55A and 55B at both ends in the axial direction of the classification hood 55) The particle size distribution of the pulverized coal C4 can be more accurately controlled. In addition, the fact that it is widened in the axial direction means that it is wider than the connection portion with the rotary member 10.

The settling region 90 need not be axially widened over the entire length in the up-and-down direction. In the vicinity of the rotor 10, pulverized coal or the like does not spread in a plane immediately after it is discharged from the rotor 10 through the discharge port 50, so that it can be prevented from spreading in the axial direction as shown in the illustrated example. It is preferable that the ceiling portion 55u of the classifying hood 55 is narrowed toward the stationary exhaust port 56 in the axial direction of the rotor 10 as shown in the drawing. The degree of expansion of the classification hood 55 is preferably set to 1.5Z1 < Z2 < 6Z1 when the axial length of the connecting portion with the rotor 10 is Z1 and the axial length of the widening portion is Z2, 2Z1 < Z2 < 4Z1. Further, the settling region 90 may be widened in the width direction as shown in Figs. 8 and 9, or both in the width direction and the axial direction, though not shown. It is possible to appropriately determine how to widen the settling region 90 in consideration of peripheral facilities and the like. However, there is an advantage that the installation space of the entire transverse rotary dryer can be reduced by the widening in the axial direction.

4 and 5, in the sedimentation area 90, a plurality of supporting members 62 (see FIG. 4) are provided between the wall member 55A on one side in the axial direction of the classification hood 55 and the wall member 55B on the other side in the axial direction. , 63 are provided. There is a possibility that the strength of the classification hood 55 is widened in the axial direction. However, a plurality of supporting members 62, 63 are provided between the wall member 55A on one side in the axial direction and the wall member 55B on the other side in the axial direction The strength of the classification hood 55 is maintained. The supporting members 62 and 63 may be provided between one wall member 55A and the other wall member 55B of the portion of the classifying hood 55 which does not extend in the axial direction as shown in the drawing.

The supporting member for maintaining the strength of the classification hood 55 may be composed of a straight rod member or a pipe member. In this embodiment, the pipe member 62 and the umbrella member 63). The umbrella member 63 has an umbrella shape protruding upward in the middle in the width direction and is arranged to extend along the direction in which the pipe member 62 extends. The presence of the umbrella material 63 prevents the dry charcoal C2 from being deposited on the pipe material 62. [ The umbrella material 63 itself may or may not have the function of maintaining the strength of the classification hood 55. [

As described above, the ceiling portion 55u of the classifying hood 55 is narrowed in the width direction as it faces the fixed exhaust port 56. In this case, however, below the fixed exhaust port 56, It is preferable that the support members 62 and 63 are not positioned as shown in Fig. When the upper portion 55u of the classification hood 55 is narrowed toward the stationary exhaust port 56 in the width direction, the flow (upflow) along the wall material having this narrowed width, as shown in Fig. 4, (S1) is generated, and the pulverized coal C4 is piled up in this flow S1. Therefore, the ascending pulverized coal C4 does not collide with the ceiling surface of the classification hood 55 and falls, and the particle diameter distribution of the pulverized coal C4 can be more accurately controlled. In the classifying hood 55, a flow S1 is generated along the wall material and a flow S2 rising vertically at the center is mainly generated. In the flow S2, . Therefore, if the plurality of supporting members 62 and 63 are not positioned below the fixed exhaust port 56, the pulverized coal C4 piled up in the flow S2 vertically rising at the center is fed to the support members 62 and 63 It is possible to control the particle size distribution of the fine coal (C4) more precisely.

As shown in Fig. 4, a rising flow occurs on the flow path of the dry coal C2 from the discharge port 50 of the rotator 10 to the fixed discharge port 57 by free fall or the like, The blowing means 58 of the dispersing gas N is provided. When the blowing up of the dispersing gas N is carried out on the flow path of the dry carbon C2, the pulverized coal descended together with the dry carbon C2 from the discharge port 50 is reliably blown The particle diameter distribution of the pulverized coal C4 can be more accurately controlled. When the blown up of the dispersing gas N is carried out on the flow path of the dry charcoal C2 reaching the fixed discharge port 57, the dry charcoal C2 is discharged from the fixed discharge port 57 So that it is not necessary to take the consideration for introducing the dry carbon C2 into the fixed discharge port 57. [

The specific form of the blowing means 58 of the dispersing gas N is not particularly limited and may be constituted by a dispersing plate made of a netting material or the like and means for blowing up the dispersing gas N through the mesh of the netting material have. However, in this embodiment, as the blowing means 58 of the dispersing gas N, as shown in Fig. 6 and Fig. 7, the blowing means 58 of the dispersing gas N crosses the flow path of the dry carbon C2 reaching the fixed discharge port 57, And a pipe member 58A in which a hole 58Ac is formed in the peripheral wall is configured to blow up the dispersing gas N from the hole 58Ac formed in the pipe member 58A. When the blowing means 58 of the dispersing gas N is constituted by the pipe material 58A crossing the flow path of the dry coal C2 reaching the fixed discharge port 57, (57). Further, when the dispersing gas N is blown up from the hole 58Ac formed in the peripheral wall of the pipe member 58A, the blowing effect surely extends to the pulverized coal in the dry coal C2.

In the present embodiment, the hole 58Ac formed in the peripheral wall of the pipe member 58A is circular, and a plurality of pipes 58A are formed at appropriate intervals in the direction in which the pipe member 58A extends. Further, the hole 58Ac is formed such that the dispersion gas N is blown up obliquely as shown in Fig. 7 (a).

It is preferable that a plurality of the pipe members 58A are arranged in parallel in the axial direction of the rotator 10 in the vicinity of the fixed outlet 57, as shown in the illustrated example. In this embodiment, the dispersion gas N is sprayed on the dry carbon C2 which is going to descend between the pipe members 58A adjacent to each other, so that the pulverized coal is blown up by the dispersion gas N, C2 descend directly between the pipe members 58A and are discharged from the fixed discharge port 57. [ The pulverized coal pulverized by the dispersing gas N rises in the classification hood 55 and a part of the pulverized coal C4 is discharged from the fixed discharge port 56 in relation to the ascending speed do.

In this embodiment, the flow rate of the ascending flow is controlled by controlling the flow rate of the dispersed gas N blown from each hole 58Ac. Here, the flow velocity of the dispersing gas N is controlled so as to control the flow rate of the ascending flow in the classification hood 55, and the flow rate of the ascending flow is usually different depending on the portions such as the bottom portion, the ceiling portion and the like. Therefore, when determining the flow rate of the ascending flow, it is preferable to determine the flow rate of the ascending flow based on the flow rate at the vertically central portion of the settling region 90, particularly the settling region 90 (the central portion when the distances L are tripled) Is recommended. Since the pulverized coal is classified in the settling region 90, it is preferable that the flow rate of the upflow in the settled region 90 be used as a reference. The slip rate tends to be lower than intended when the lower end of the settling region 90 is taken as a reference. On the other hand, when the upper end of the settling region 90 is referred to as the upper end, It is preferable to determine the flow velocity with reference to the vertical central portion of the sedimentation region 90. [

A plurality of pipe members made up of a plurality of pipe members 58A may be provided in a plurality of stages apart in the vertical direction. Further, the umbrella material 58B may be disposed on each pipe member 58A as in this embodiment. The umbrella material 58B has an umbrella shape protruding upward in the center in the width direction and extends along the direction in which the pipe material 58A extends. The presence of the umbrella material 58B more reliably prevents the dry charcoal C2 from being deposited on the pipe material 58A.

As shown in Figs. 1 and 2, a supply pipe 70 and a drain pipe 71 for supplying steam J1 are installed in the steam pipe (heating pipe) 11 at the other end side of the rotor 10. The drain water D discharged through the drain pipe 71 is sent to the heat exchanger 115 and can be used for heating the air A1 used for conveying the pulverized coal C4. The steam to be supplied to the steam tube 11 may be steam J2 generated by the boiler 130 or steam steam of a steam turbine using the steam J2.

On the other hand, a screw feeder 42 having a screw therein and formed into a cylindrical shape is provided at one end of the rotator 10 so as to be inserted into the rotator 10. At one end of the screw feeder 42, a driving means 43 such as a motor for rotating a screw provided inside the screw feeder 42 is provided. The supply port 41 of the coal C1 is opened at the upper part of the screw feeder 42 so that the supply port 41 and the inside of the screw feeder 42 communicate with each other.

The coal C1 to be dried is supplied from the supply port 41 into the screw feeder 42. The screw installed in the screw feeder 42 is rotated by the driving means 43 to rotate 10, respectively. The carrier gas G1 is also blown from the supply port 41 or another supply port not shown and the blown carrier gas G1 is supplied to the inside of the rotator 10 toward the other end side of the rotator 10 Circulate.

Next, the operation of the transverse rotary dryer 100 will be described.

When the coal (C1) is dried by the lateral type rotary dryer of this embodiment, the coal (C1) is supplied to the supply port (41) as shown in Fig. The coal C1 supplied from the supply port 41 is supplied to the inside of the rotator 10 by the screw feeder 42 and is contacted with the steam tube 11 heated by the steam J1, And moves to the other end side of the tradition 10.

When the coal C1 reaches the position where the agitating means 65 is present, the coal C1 is stirred by the agitating means 65, and subsequently, as shown in Fig. 4, And is scratched by the scraping plate 61 rotating in accordance with the rotation. The scraped coal C1 (dry charcoal C2) falls naturally when the scraping plate 61 is positioned on the upper side of the rotator 10. At that time, the coal C1 (the dry coal C2) The pulverized coal contained in the pulverizer 10 is dispersed (so-called flight action).

On the other hand, the carrier gas G1 blown from the supply port 41 formed at one end of the rotator 10 or another supply port (not shown) passes through the rotator 10, And exhausted from the exhaust port 50 as exhaust gas together with steam or the like. At this time, the exhaust gas is discharged from the discharge port 50 together with the fine coal powder dispersed in the rotor 10 by the scraping plate 61. The exhaust gas discharged from the discharge port (50) is exhausted from the classification hood (55) through the fixed exhaust port (56) together with a part of the pulverized coal. Further, the dispersing gas N is blown up by the blowing means 58 of the dispersing gas N toward the upper part of the classifying hood 55, so that the upward flow is formed. The flow rate of the dispersing gas (N) is usually smaller than the flow rate of the exhaust gas discharged from the discharge port (50). When the exhaust gas is exhausted from the exhaust port 50, the flow velocity is, for example, 5 to 10 m / s. The flow velocity is appropriately adjusted according to the area of the discharge port 50 and the blowing amount of the carrier gas G1.

The dry charcoal C2 drops in the rotary drum 10 and does not follow the exhaust gas, but drops off from the discharge port 50 located on the lower side. The naturally dropped dry charcoal C2 is not blown up again by the dispersing gas N and is discharged from the fixed discharge port 57 through the pipe material 58A. In the pulverized coal in the dry coal C2, the pulverized coal having a relatively large diameter is piled up in the exhaust gas or discharged together with the dry coal C2 from the discharge port 50. However, the pulverized coal is heavy in weight and flows up to the fixed exhaust port 56 Is not conveyed, falls downward, and is discharged from the fixed discharge port (57) together with the dry charcoal (C2). On the other hand, in the pulverized coal in the dry coal C2, the pulverized coal having a relatively small diameter is piled up in the exhaust gas or discharged together with the dry coal C2 from the discharge port 50 and conveyed to the fixed discharge port 56 by the rising flow, And is discharged from the fixed exhaust port 56 together with the exhaust gas G2.

Next, the operation and effect of the lateral type rotary dryer 100 will be described.

When the scraping plate 61 is provided inside the rotator 10 like the horizontal type rotary dryer of the present embodiment, the pulverized coal contained in the coal C1 (the dried coal C2) The pulverized coal can be piled up in the exhaust gas and discharged from the discharge port 50 together with the dry carbon C2, so that the possibility of being discharged from the fixed discharge port 57 is reduced. Therefore, the particle diameter distribution of the pulverized coal C4 can be more accurately controlled.

Each of the raking plates 61 passes through the front side end of the discharge port 50 located on the rear side with respect to the rotational direction R of the rotator 10, The dry charcoal C2 placed on the scraping plate 61 is located on the rear side of the discharge port 50. In this case, Therefore, the dry charcoal C2 on the scraping plate 61 is prevented from directly entering the discharge port 50, and the probability that the dry charcoal C2 in the state of coarse coal is discharged from the discharge port 50 is reduced.

The coal C1 (dry charcoal C2) moving inside the rotator 10 is scraped off from the scraping plate 61 when the plurality of scraped plate heaters 60 are intermittently positioned in the axial direction of the rotator 10, And passes through the existing part and the non-existing part alternately. Therefore, the coal (C1) (dry charcoal (C2)) is scratched by dividing into a plurality of circuits, and the scraping efficiency is improved.

In addition, when the raking plates 61 are intermittently positioned so as to be spaced equidistantly from each other in the circumferential direction of the rotator 10, the coal (C1) (dry charcoal (C2)) can be scraped efficiently. Concretely, the scraping plate 61 extending from the inner wall of the rotator 10 to the axis and scraping the coal (C1) (the dry coal (C2)) together with the rotation of the rotator 10 is spaced in the circumferential direction A large number of pulverized coal can be entrained in the exhaust gas because the exhaust gas passes through the coal (C1) (dry coal (C2)) falling from the scraping plate (61) ), The probability of being discharged is reduced. In addition, the efficiency of contact between the coal (C1) and the steam tube (11) is increased by the scraping plate (61), so that there is a further advantage that the drying efficiency is increased.

The scraping plate 61 of the scraped plate heat 60 on the other end side (downstream side) among the scraped plate columns 60 is moved in the direction of the discharge port 50 with respect to the rotating direction R of the rotator 10, And has a base end of the scraping plate 61 and extends in the direction from the inner wall of the rotator 10 toward the axis. Therefore, a large number of coal (C1) (dry coal (C2)) can be scooped up between the next discharge port (50) on the side of the rotational direction of the rotator (10). As a result, as compared with the kiln action, the coal (C1) (the dry coal (C2)) is more finely stirred, and the probability that the pulverized coal is discharged in a state mixed with the dry coal (C2) is reduced.

In this embodiment, the scraping plate 61 is extended from the base end toward the central axis of the rotator 10, and the extending leading end portion is configured to be curved in the lateral direction with respect to the rotation direction R of the rotator 10 have. Therefore, more coal (C1) (dry charcoal (C2)) can be scooped up between the next outlet (50) in the direction of rotation of the rotor (10). As a result, the probability that the coal (C1) (dry coal (C2)) is more agitated and the pulverized coal is mixed with the dry coal (C2) is reduced.

If agitation means 65 for agitating the coal (C1) (dry coal (C2)) supplied into the rotary kiln 10 is provided at one end side of the rotor 10 more than the scraped plate 60, The coal (C1) (dry coal (C2)) is stirred before the coal (C1) (dry coal (C2) The pulverized coal is washed away. As a result, the dispersion efficiency of the pulverized coal by the scraping plate 61 is improved. However, the agitating means 65 and the scraping plate 61 need not be provided, but if equipped, the possibility that the pulverized coal is discharged in a state of being mixed with the dry charcoal C2 is reduced, which is a more preferable apparatus.

A discharge port 50 that moves in the circumferential direction in accordance with the rotation of the rotary tub 10 installed on the peripheral wall of the rotary tub 10 and a discharge hood 55 formed on the bottom of the classification hood 55 provided so as to cover the discharge hole 50, The sedimentation region 90 between the discharge port 50 and the fixed discharge port 56 is formed by combining the stationary discharge port 57 which is fixed and does not move and the fixed discharge port 56 which is formed in the ceiling portion of the classification hood 55, , The classification by the ascending flow is performed. That is, the desired pulverized coal C4 is discharged along the exhaust gas G2 from the fixed exhaust port 56, and the pulverized coal C4 is fallen toward the fixed discharge port 57 and discharged.

When the inside of the classification hood 55 above the rotary kiln 10 is set to the settling region 90 which is a space filled with exhaust gas or the like, the coarse powder of relatively large diameter accompanied by the exhaust gas is inerted And is discharged from the fixed discharge port 57. [

When the blowing means 58 of the dispersing gas N is provided on the flow path of the dry carbon C2 reaching the fixed discharge port 57, the pulverized coal falling along with the dry carbon C2 in the fixed discharge port 57 It can be raised toward the fixed exhaust port 56, and as a result, the removal efficiency of the pulverized coal is improved.

In this embodiment, the number of the scraping plates 61 per each scraped plate array 60 is not limited to four, and is preferably 4 to 6 in order to secure the scraping capacity. The number of the discharge ports 50 per one row is not particularly limited, but is preferably 10 to 17 in consideration of reduction in pressure loss, dispersion of pulverized coal, and mechanical strength of the rotor 10.

[Modified Example 1]

Next, modified examples of the lateral type rotary dryer 100 will be described focusing on differences from the above-described embodiment.

Fig. 8 shows the classification hood 55 of this embodiment. The classifying hood 55 of this embodiment is also provided so as to cover the discharge port 50 at one end side of the rotator 10. The classifying hood 55 is also fixed to the paper surface by means not shown, and does not rotate in accordance with the rotational motion of the rotator 10. However, in the classification hood 55 of this embodiment, the ceiling portion 55u is slightly wider than the intermediate portion 55c. The inside of the ceiling portion 55u is a settling region 90 which is a space filled with exhaust gas or the like. In addition, the bottom portion 55d is narrower in width direction as it faces the fixed discharge port 57 in the lower portion of the rotator 10.

The bottom portion 55d of the classifying hood 55 of this embodiment is also provided with the blowing means 58 of the dispersing gas N which is the rising flow generating means. The blowing means 58 of the dispersing gas N is composed of a dispersing plate 58a whose upper portion is a net having a close eye. The dispersion plate 58a is disposed on the bottom surface of the bottom portion 55d and is inclined downward toward the fixed discharge port 57 to form a falling chute. The blowing means 58 is also supplied with the dispersing gas N, for example, in the same manner as in the previous embodiment. The supplied dispersion gas N is blown up into the classification hood 55 through the dispersion plate 58a. In this embodiment, since the distribution plate 58a is inclined, the dry carbon C2 can be rapidly dropped to the fixed discharge port 57 as compared with the case where the dispersion plate 58a is horizontal. However, in this embodiment, only the bottom central portion of the bottom portion 55d is fixedly connected to the fixed outlet 57 in order to arrange the dispersion plate 58a, while the entire bottom portion of the bottom portion 55d is the fixed outlet 57. [ (57). Therefore, there is a possibility that the dry charcoal C2 is deposited on the bottom surface, and the foregoing embodiment is preferable in this respect. In this embodiment, the blowing means 58 of the dispersing gas N, which is the ascending flow generating means, is provided on the flow path of the dry carbon C2 from the discharge port 50 of the rotor 10 to the fixed discharge port 57 It is not installed. Therefore, there is a possibility that the dispersed gas N does not act directly on the dried charcoal C2, and the above-described embodiment is also preferable in this regard.

[Modified Example 2]

Fig. 9 shows another type of classification hood 55. Fig. The classification hood 55 of this embodiment differs from the above-described type in the position of the blowing means 58 of the dispersing gas N as the upflow generating means and the position of the fixed discharge port 57. The fixed discharge port 57 is not opened toward the lower side but is opened toward the side. And the blowing means 58 of the dispersing gas N is arranged in parallel with the fixed outlet 57. The dispersing plate 58a constituting the blowing means 58 is horizontally installed. This configuration is useful when there is no space below the classifying hood 55 or the like.

(Other)

In the above embodiment, only one rising flow generating means 58 is provided in the classifying hood 55. However, the rising flow generating means 58 may be provided with two, three, four or more You may. When a plurality of ascending flow generating means 58 are provided, it is preferable to arrange the ascending portion 55u, the intermediate portion 55c and the bottom portion 55d of the classification hood 55 separately. Further, the method for generating the ascending flow is not limited to the blowing up of the dispersing gas N, and the suction action (negative pressure) from above may be used if possible.

The coal boiler facility of this embodiment is not particularly limited in its use, and can be used, for example, in a plant using heat from a thermal power plant, a sugar plant, a pulp plant, or the like. The present invention can be suitably applied to facilities that can use the steam J2 generated by heating the water W in the boiler 130. [

The present invention can be applied to a coal rotary type dryer of a coal which can be used in a thermal power plant or the like, and a coal boiler facility which is equipped with the horizontal rotary type dryer.

10 times traditional 11 steam tube (heating tube)
41 Supply port 50 Outlet
55 class hood 56 fixed exhaust
57 Fixed outlet 58 Means for blowing up
61 Scraping plate 65 Agitating means
100 Horizontal Rotary Dryer 120 Grinder
130 Boiler C1 Coal
C2 dry burnt C3 crushed coal
C4 pulverized coal G1 carrier gas
N dispersive gas

Claims (4)

A coal feed port and a carrier gas feed port are provided at one end and a rotary passage and an exhaust port for dry coal and exhaust gas are provided at the other end,
A heating means for heating the coal in the rotary kiln,
A classifying hood having a fixed outlet of the dry coal at the bottom and a fixed outlet of the exhaust gas in the ceiling,
A horizontal rotary dryer of coal, comprising:
A rising flow generating means for generating a rising flow in the classification hood,
And a flow rate control means for controlling the flow rate of the ascending flow,
A sedimentation area is formed in an upper portion of the classification hood above the cyclone,
In the sedimentation region, the classification hood is configured to be widened in the axial direction of the rotary shaft,
A part or all of the pulverized coal in the dry coal is discharged from the fixed discharge port by the upward flow,
As the rising flow generating means, a dispersion gas blowing means for blowing up the dispersion gas from the bottom of the classification hood is provided,
Wherein the dispersing gas blowing means includes a plurality of pipe members and a plurality of holes formed in each of the plurality of pipe members in a direction in which the plurality of pipe members extend,
Wherein the umbrella material is disposed on each of the plurality of pipe members. As a coal boiler facility having a coal dryer, a dry coal grinder that is dried with this dryer, and a boiler using the pulverized coal pulverized by the grinder,
A coal feed port and a carrier gas feed port are provided at one end and a rotary passage and an exhaust port for dry coal and exhaust gas are provided at the other end,
A heating means for heating the coal in the rotary kiln,
A classification hood covering the discharge port, having a fixed discharge port of dry coal at the bottom, and a fixed discharge port of exhaust gas in the ceiling portion,
A rising flow generating means for generating a rising flow in the classification hood,
And a flow rate control means for controlling the flow rate of the ascending flow,
A sedimentation area is formed in an upper portion of the classification hood above the cyclone,
In the sedimentation region, the classification hood is configured to be widened in the axial direction of the rotary shaft,
As the upward flow generating means, a dispersion gas blowing means for blowing up the dispersion gas from the bottom of the classification hood is provided,
Wherein the dispersing gas blowing means includes a plurality of pipe members and a plurality of holes formed in each of the plurality of pipe members in a direction in which the plurality of pipe members extend,
An umbrella material is disposed on each of the plurality of pipe members,
A horizontal rotary dryer for discharging part or all of the pulverized coal in the dry coal from the fixed outlet by the upward flow is used as the dryer,
The dried coal discharged from the stationary discharge port of the horizontal rotary dryer is crushed by the crusher and then used as the fuel of the boiler,
On the other hand, the pulverized coal discharged from the fixed exhaust port of the transverse rotary dryer is collected,
A coal boiler facility. 3. The method of claim 2,
Wherein at least one of the carrier gas and the dispersion gas is discharged from the fixed exhaust port and at least one of the exhaust gas after the pulverized coal is collected and the exhaust gas of the boiler is used,
Coal boiler installations. As a method of operating a coal boiler facility having a coal dryer, a dry coal grinder that is dried by the dryer, and a boiler using a pulverized coal pulverized by the grinder,
A coal feed port and a carrier gas feed port are provided at one end and a rotary passage and an exhaust port for dry coal and exhaust gas are provided at the other end,
A heating means for heating the coal in the rotary kiln,
A classifying hood having a fixed outlet of the dry coal at the bottom portion and a fixed outlet of the exhaust gas in the ceiling portion,
A sedimentation area is formed in an upper portion of the classification hood above the cyclone,
A horizontal rotary type dryer in which the classification hood is widened in an axial direction of the rotary kiln in the settling region is used as the dryer,
And controlling the flow rate of the ascending flow of the pulverized coal to be discharged when part or all of the pulverized coal in the dried coal is discharged from the fixed discharge port by generating a rising flow in the classification hood,
As the rising flow generating means, a dispersion gas blowing means for blowing up the dispersion gas from the bottom of the classification hood is provided,
Wherein the dispersing gas blowing means includes a plurality of pipe members and a plurality of holes formed in each of the plurality of pipe members in a direction in which the plurality of pipe members extend,
An umbrella material is disposed on each of the plurality of pipe members,
The dry coal discharged from the stationary discharge port of the horizontal rotary dryer is crushed by the crusher and then used as fuel for the boiler.
On the other hand, the pulverized coal discharged from the fixed exhaust port of the transverse rotary dryer is collected and used as fuel for the boiler,
Wherein the operation of the coal boiler facility is controlled by the control unit.

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