WO2020158270A1 - Crusher, boiler system, and method for operating crusher - Google Patents

Abstract

A mill (10) comprises: a housing (11); a rotating table (12) and a roller (13) which crush a solid fuel into a fine powder solid fuel; a classifier; a primary air flow channel which supplies primary air that conveys the fine powder solid fuel on the rotating table (12) to the classifier; and a drift plate (60) which is provided to an internal peripheral surface and which has a first inclined surface (64) extending at a downward slant toward the center axis of the housing (11) and a second inclined surface (65) extending at an upward slant toward the center axis. The drift plate (60) is provided between the plurality of rollers (13), at a position at the same height as the rollers (13), and the circumferential side end edges of the first inclined surface (64) and the second inclined surface (65) are both inclined so that the radially inward ends of the side end edges on one side and the radially inward ends of the side end edges on the other side are close to the radial direction of the rotating table (12).

Description

Crusher and boiler system, and operating method of the crusher

The present invention relates to a crusher, a boiler system, and a method for operating the crusher.

A crusher (mill) crushes solid fuel such as coal or biomass by sandwiching it with rollers on a rotary table. The pulverized solid fuel is rolled up vertically by the primary air passing through the air outlet (gap between the inner peripheral surface of the housing and the outer peripheral end of the rotary table) provided on the outer peripheral side of the rotary table of the housing, Guided to the classifier. Among the solid fuels that have reached the classifier, the coarse powder fuel with a large diameter is returned to the rotary table and pulverized again, and the fine powder fuel with a small diameter is guided to the outlet at the ceiling of the housing. Thus, during the operation of the mill, an ascending airflow from the lower part of the rotary table due to the primary air and a descending airflow containing the coarse fuel that is returned to the table from the classifier are generated in the mill. When the updraft and the downdraft are generated, the updraft and the downdraft interfere with or collide with each other inside the mill, which may cause a pressure loss. Therefore, the mill may be provided with a structure for adjusting the ascending airflow and the descending airflow generated in the mill (for example, Patent Document 1 and Patent Document 2).

Patent Document 1 discloses a device in which an inner wall surface of a housing is provided with a drift portion configured to divert an air flow rising in an outer peripheral region toward a central axis of the housing. .. In this device, the drift portion is provided on the inner wall surface of the housing over the entire circumference of the housing.

Patent Document 2 discloses a device in which a baffle part is provided on the inner wall surface of the housing between the crushing table and the classifying part in the height direction of the housing. The baffle portion projects toward the central axis of the housing and extends only in a partial region of the housing in the circumferential direction. Further, a plurality of baffle portions are provided, and the plurality of baffle portions are arranged at intervals in the circumferential direction of the housing.

JP, 2017-131829, A JP, 2017-140566, A

In the device of Patent Document 1, the drift portion is provided over the entire circumference of the housing. That is, the uneven flow portion is provided above the crushing roller at a position where it does not interfere with the crushing roller. In this way, when the uneven flow portion is provided above the crushing roller, the distance between the uneven flow portion and the air outlet becomes long. If the distance between the drift portion and the air outlet becomes long, there is a possibility that the updraft that has passed through the air outlet cannot be suitably guided by the drift portion.

In order to reduce the distance between the drift portion and the outlet, it is necessary to provide the drift portion at the same vertical position as the crushing roller in the vertical direction. However, since the drift portion and the crushing roller are both provided on the inner peripheral surface of the housing, they may interfere with each other. In order to avoid interference between the uneven flow portion and the crushing roller, a configuration in which a plurality of uneven flow portions (baffle portions) are provided only in a partial area in the circumferential direction as in Patent Document 2 and a plurality of baffle portions are provided may be considered. That is, a configuration may be considered in which a drift portion extending only in a partial area in the circumferential direction is provided between a plurality of rollers. However, in the baffle portion of Patent Document 2, since it is not actually provided between the plurality of rollers, consideration is not given to the interference between the rollers and the drift portion. For this reason, in the baffle portion of Patent Document 2, the circumferential edge extends in the radial direction of the housing and the rotary table. With such a configuration, the area of the inclined surface of the baffle portion cannot be formed large, and there is a possibility that the upward airflow and the downward airflow cannot be guided appropriately.

In addition, the device of Patent Document 1 does not consider the angle of the inclined surface of the drift portion. In the device of Patent Document 1, the drift portion is provided at a relatively low position, but depending on the angle of the inclined surface of the drift portion, it is difficult for the ascending airflow to reach the classification portion, and crushed solid fuel is suitable. There was a possibility that it could not be transported to.

The present invention has been made in view of such circumstances, and by appropriately guiding the ascending airflow and the descending airflow generated in the housing of the crusher toward the center of the housing, the pressure loss in the housing is reduced. An object of the present invention is to provide a crusher and a boiler system capable of further suppressing the above, and an operating method of the crusher.
It is another object of the present invention to provide a pulverizer and a boiler system that can suitably convey pulverized solid fuel to a classifying unit by a carrier gas, and a method for operating the pulverizer.

In order to solve the above problems, the crusher, the boiler system, and the method for operating the crusher of the present invention employ the following means.
A crusher according to a first aspect of the present invention is provided with a casing that extends in a vertical vertical direction and forms an outer shell, and is separated from an inner peripheral surface of the casing, and is supplied into the casing. And a crushed solid fuel, which is supported by a rotary table on which the solid fuel is placed, and a support portion which extends from the inner peripheral surface toward the center of the rotary table, and which crushes the solid fuel placed on the rotary table. A plurality of crushing rollers, and a classifying unit that is provided vertically above the rotary table and classifies the crushed solid fuel into the crushed solid fuel having a particle size larger than a predetermined particle size and the crushed solid fuel having a particle size smaller than the predetermined particle size. And a transport gas for transporting the crushed solid fuel to the classifying unit inside the casing, and a transport gas supply unit provided vertically below the rotary table, and a vertical upper and lower portion of the casing. A first inclined surface extending obliquely downward toward a central axis extending in the direction and a second inclined surface located vertically below the first inclined surface and extending obliquely upward toward the central axis. A diverging portion provided on an inner peripheral surface, wherein the plurality of crushing rollers are arranged along a circumferential direction of the rotary table, and the diverging portion is between the plurality of crushing rollers. The peripheral edge of the first inclined surface and the second inclined surface is provided at the same height as the crushing roller, and the peripheral edge of each of the first inclined surface and the second inclined surface is on one side with respect to the radial direction of the rotary table. Is inclined so that the inner radial end thereof approaches the inner radial end of the other edge.

The transport gas supplied from the transport gas supply unit passes through a gap (hereinafter, referred to as “blowout port”) formed between the rotary table and the housing. Then, the carrier gas that has passed through the blowout port carries the crushed solid fuel on the rotary table to the classifying unit. In the above configuration, the crushing roller that presses the solid fuel placed on the rotary table from above in the vertical direction and the drift portion are provided at the same height position. That is, the drift portion itself is provided at a position higher than the height position of the crushing table (that is, vertically above the air outlet). As a result, a part of the carrier gas (hereinafter, referred to as “updraft”) that passes through the air outlet and heads to the vertically upward classifying unit flows along the second inclined surface. Since the second inclined surface extends obliquely upward toward the central axis line extending in the vertical vertical direction of the housing, the upward airflow flowing along the second inclined surface is guided in the central axis direction of the housing. To be done. On the other hand, the crushed solid fuel (hereinafter, referred to as "coarse powder fuel") having a larger particle size than the predetermined particle size that is classified in the classifying unit and returned to the crushing table drops downward from above vertically, and therefore generates a descending air flow. A part of the descending airflow generated by the falling coarse powder fuel flows along the first inclined surface. Since the first inclined surface extends obliquely downward toward the central axis extending in the vertical vertical direction of the housing, the downdraft flowing along the first inclined surface is guided in the central axis direction of the housing. .. In this way, both the ascending airflow and the descending airflow are guided in the central axis direction of the housing, so that the position where the ascending airflow and the descending airflow that occur in the housing interfere with each other is a central region with a large volume in the housing. Be on the side. As a result, the position where the ascending airflow and the descending airflow interfere with each other can be set to a position where the influence of the airflow in the housing is small, so that the conveyance of the crushed solid fuel to the classification unit can be maintained and the pressure loss in the housing Can be suppressed. Therefore, since it is possible to suppress an increase in the blowing power of the carrier gas, it is possible to improve the production efficiency of a small pulverized solid fuel (hereinafter referred to as “fine powder fuel”) pulverized to a predetermined particle size or less.
The same height position is a height position where the lower end (lower edge) of the flow diverter plate and the lower end of the crushing roller (closest portion to the rotary table surface) coincide with each other within a predetermined range with respect to the rotary table. That is. Further, the predetermined range may be set with respect to the height position of the upper end of the air outlet around the rotary table.

Moreover, in the above configuration, the drift portion is provided at the same height as the crushing roller. That is, in the above configuration, the drift portion is provided near the air outlet. Thus, the carrier gas that has passed through the outlet can be immediately and reliably guided in the central axis direction of the housing.

Further, in the above-described configuration, in the drift portion, the circumferential end edges of the first inclined surface and the second inclined surface have the inner end in the radial direction of one end with respect to the radial direction of the crushing table and the other end. It is inclined so that it approaches the inner edge. That is, the edges of the first inclined surface and the second inclined surface are inclined so as to substantially follow the outer shape of the crushing roller adjacent to the drift portion. Accordingly, even when the drift portion is arranged near the outlet, it is possible to prevent the drift portion and the crushing roller from interfering with each other. Therefore, when the inner ends of the circumferential edges of the first inclined surface and the second inclined surface are in the same position, the circumferential edges of the first inclined surface and the second inclined surface extend in the radial direction of the turntable. The area of the first inclined surface and the second inclined surface can be increased as compared with the configuration described above. Therefore, more upward airflow and lower airflow can be guided toward the center of the housing, so that the transport of the pulverized solid fuel to the classifying unit can be maintained and the pressure loss in the housing can be further suppressed. ..

Further, the crusher according to the second aspect of the present invention is arranged such that the casing forming an outer shell and the inner peripheral surface of the casing are spaced apart from each other, and the solid fuel supplied into the casing is mounted on the casing. And a crushing unit for crushing the solid fuel into crushed solid fuel on the rotary table; and a crushing solid fuel provided above the rotary table in a vertical direction above the predetermined particle size. A classifying unit for classifying the crushed solid fuel having a larger size and the crushed solid fuel having a particle size smaller than a predetermined particle size, and a carrier gas for transporting the crushed solid fuel to the classifying unit are supplied into the casing to rotate A conveying gas supply portion provided vertically below the table, a first inclined surface extending obliquely downward toward a central axis extending in the vertical vertical direction of the housing, and a vertical lower side than the first inclined surface. A second inclined surface that is positioned and extends obliquely upward toward the central axis, and a drift portion provided on the inner peripheral surface, and the acute angle formed by the first inclined surface and the horizontal plane is: It is smaller than the acute angle formed by the second inclined surface and the horizontal plane.

In the above configuration, the acute angle formed by the first inclined surface and the horizontal surface is smaller than the acute angle formed by the second inclined surface and the horizontal surface. That is, the upward airflow along the second inclined surface has a stronger vertical guiding force than the downward airflow along the first inclined surface. As a result, the flow velocity of the updraft becomes higher than that of the downdraft. Therefore, the crushed solid fuel can be reliably transported to the classifying unit provided vertically upward by the transport gas.

Further, in the crusher according to the first aspect or the second aspect of the present invention, the drift portion is arranged such that a vertical lower end of the second inclined surface is located at a predetermined height position, and the predetermined height is set. The height position is a height position above the height position of the upper end of the gap formed between the rotary table and the inner peripheral surface of the housing by 25% of the radius of the rotary table. And a height position between a height position of 25% of the radius of the rotary table and a height position lower than the height position of the upper end of the gap.

In the above configuration, the lower end (lower edge) of the deflector plate and the lower end of the crushing roller (the portion closest to the surface of the rotary table) coincide with each other at a height position within a predetermined range with respect to the rotary table. In addition, the predetermined range is set with respect to the height position of the upper end of the gap of the air outlet around the rotary table, and the height position is the same as the length of 25% of the radius of the crushing table and the upper position. The height position is between 25% of the radius of the crushing table and the height position below the same length. Therefore, the carrier gas that passes through the air outlet of the housing immediately reaches the drift portion. Thereby, the ascending airflow can be reliably guided to the central axis side of the housing. Therefore, the collision position with the descending airflow can be surely set to the center region side in the housing, so that the pressure loss in the housing can be suppressed.

Further, in the crusher according to the first or second aspect of the present invention, the drift portion has a fixing portion fixed to the inner peripheral surface, and the fixing portion is from a lower end of the second inclined surface. It may extend vertically downward.

If the position where the drift portion is provided is, for example, a height position equivalent to the height of the worker or a height position higher than the height of the worker, the worker does not attach the drift portion to the housing. May be accessed from below. In the above configuration, the drift portion is fixed to the housing by the fixing portion that extends downward from the lower end of the second inclined surface. This makes it difficult for the worker to interfere with the first inclined surface and the second inclined surface when performing the work of fixing the drift portion to the inner peripheral surface of the housing. Therefore, the fixing work can be facilitated.
Further, in the above configuration, the fixing portion extends downward from the lower end of the second inclined surface. Therefore, the solid fuel can be prevented from accumulating on the fixed portion.

Further, in the crusher according to the first aspect or the second aspect of the present invention, a wear resistant portion may be provided on the second inclined surface.

▼ In the above configuration, the wear resistant portion is provided on the second inclined surface. As a result, it is possible to suppress the wear of the second inclined surface due to guiding the primary air containing the crushed solid fuel.

A boiler system according to a third aspect of the present invention includes any one of the above crushers and a boiler that combusts the solid fuel crushed by the crusher to generate steam.

In the method for operating a crusher according to a fourth aspect of the present invention, the crusher extends vertically and vertically, and is disposed apart from a casing that forms an outer shell and an inner peripheral surface of the casing. At the same time, the rotary table on which the solid fuel supplied into the housing is placed, and the solid fuel placed on the rotary table and supported by the supporting portion extending from the inner peripheral surface toward the center of the rotary table. A plurality of pulverizing rollers for pulverizing the pulverized solid fuel into pulverized solid fuel, and the pulverized solid fuel having a pulverized solid fuel having a particle size larger than a predetermined particle size and the pulverized solid fuel having a particle size smaller than the predetermined particle size provided above the rotary table A classifying unit for classifying into a solid fuel and a carrier gas for carrying the crushed solid fuel to the classifying unit are supplied to the inside of the casing, and a carrier gas supply unit is provided vertically below the rotary table. And a first inclined surface extending obliquely downward toward a central axis extending vertically in the vertical direction of the housing, and a first inclined surface located vertically below the first inclined surface and extending obliquely upward toward the central axis. A plurality of the crushing rollers are arranged along the circumferential direction of the rotary table, and the plurality of crushing rollers have a plurality of sloping portions. It is provided between the crushing rollers and at the same height position as the crushing rollers, and the circumferential edges of the first inclined surface and the second inclined surface are with respect to the radial direction of the rotary table. One end of the inner edge in the radial direction of the end edge is inclined so as to approach the other end, and the carrier gas supplied from the carrier gas supply unit is directed along the second inclined surface in the central axis direction. And a step of guiding the pulverized solid fuel returning from the classifying unit to the rotary table in the direction of the central axis along the first inclined surface.

In a method of operating a crusher according to a fifth aspect of the present invention, the crusher is provided in a casing that forms an outer shell, and is spaced apart from an inner peripheral surface of the casing, and is supplied into the casing. A crushing unit for crushing the solid fuel on the rotary table to obtain crushed solid fuel, and a crushed solid fuel provided vertically above the rotary table. Inside the casing, a classifying unit for classifying the pulverized solid fuel having a particle size larger than a predetermined particle size into the pulverized solid fuel having a particle size smaller than the predetermined particle size, and a carrier gas for conveying the pulverized solid fuel to the classifying unit. And a first inclined surface and a first inclined surface extending obliquely downward toward a central axis line extending vertically in the vertical direction of the housing. A second inclined surface that is located vertically below and extends obliquely upward toward the central axis, and a drift portion provided on the inner peripheral surface, wherein the first inclined surface and the horizontal surface are The acute angle formed is smaller than the acute angle formed by the second inclined surface and the horizontal plane, and the carrier gas supplied from the carrier gas supply unit is directed along the second inclined surface in the central axis direction. And a step of guiding the pulverized solid fuel returning from the classifying unit to the rotary table in the central axis direction along the first inclined surface.

According to the present invention, by appropriately guiding the ascending airflow and the descending airflow generated in the casing of the crusher toward the center of the casing, it is possible to further suppress the pressure loss in the casing.
Further, according to the present invention, the crushed solid fuel can be suitably conveyed to the classification section.

It is a schematic block diagram of the boiler system which concerns on embodiment of this invention. It is a typical longitudinal cross-sectional view of the mill of FIG. It is a typical longitudinal cross-sectional view of the deflector plate provided in the mill of FIG. FIG. 3 is a perspective view of a crushing unit and a deflector plate of the mill of FIG. 2. FIG. 3 is a schematic plan view of a crushing roller and a deflector plate of the mill shown in FIG. 2. It is a schematic front view of the deflector plate of FIG.

Hereinafter, an embodiment of a crusher, a boiler system, and a crusher operating method according to the present invention will be described with reference to the drawings.
As shown in FIG. 1, the boiler system 1 according to the present embodiment includes a solid fuel crushing device 100 and a boiler 200.
The solid fuel crushing device 100 is, for example, a device that crushes solid fuel such as coal or biomass fuel to generate pulverized fuel and supplies the pulverized fuel to the burner unit 220 of the boiler 200. The boiler system 1 includes one solid fuel crushing device 100, but may be a system including a plurality of solid fuel crushing devices 100 corresponding to each of the plurality of burner units 220 of one boiler 200. ..

The solid fuel crushing apparatus 100 of the present embodiment includes a mill (crusher) 10, a coal feeder 20, an air blower 30, a state detector 40, and a controller 50.
In the present embodiment, “upper” means a vertically upper direction, and “upper” such as an upper part and an upper surface means a vertically upper part. Similarly, “below” indicates the vertically lower part.

The mill 10 for pulverizing solid fuel such as coal or biomass fuel supplied to the boiler 200 into pulverized solid fuel, which is pulverized solid fuel, may be of a type that pulverizes only coal or only biomass fuel. It may be in a form or may be a form in which biomass fuel is crushed together with coal.
Here, the biomass fuel is an organic resource derived from renewable organisms, and includes, for example, thinned wood, waste timber, driftwood, grass, waste, sludge, tires, and recycled fuel (pellets and Chip) and the like, and is not limited to those presented here. Biomass fuel is carbon-neutral that does not emit carbon dioxide, which is a global warming gas, because it takes in carbon dioxide during the growth process of biomass. Therefore, various uses thereof have been studied.

As shown in FIGS. 1 and 2, the mill 10 includes a housing (housing) 11 forming an outer shell, a rotary table (crushing table) 12 on which a solid fuel is placed, a roller 13 (crushing roller), The driving unit 14, the classifying unit 16, the fuel supply unit 17, and the motor 18 that rotationally drives the classifying unit 16 are provided. In the present embodiment, the rotary table 12 and the roller 13 form a crushing unit.
The housing 11 is a housing that is formed in a cylindrical shape extending in the vertical direction and that houses the rotary table 12, the rollers 13, the classifying unit 16, and the fuel supply unit 17. The inner peripheral surface 11a of the housing 11 has a substantially cylindrical shape, and the center axis C (see FIG. 2) of the housing 11 extending in the vertical direction is the same as the center axis C (rotation axis) of the rotary table 12 and the classifying unit 16 described later. It almost agrees.
The fuel supply unit 17 is attached to the central portion of the ceiling portion 42 of the housing 11. The fuel supply unit 17 supplies the solid fuel introduced from the bunker 21 into the housing 11, is arranged at the center position of the housing 11 along the vertical direction, and the lower end portion is extended to the inside of the housing 11. ing.

The drive unit 14 is installed near the bottom surface 41 of the housing 11, and the rotary table 12 that is rotated by the drive force transmitted from the drive unit 14 is rotatably arranged.
The rotary table 12 is a circular member in plan view (that is, a disk-shaped member), and is arranged so that the lower ends of the fuel supply units 17 face each other. Further, the rotary table 12 is arranged such that the outer peripheral end thereof is separated from the inner peripheral surface 11 a of the housing 11 by a predetermined distance. The upper surface of the rotary table 12 may have, for example, a slanted shape such that the central portion is low and the height is high toward the outside, and the outer peripheral portion is bent upward. The fuel supply unit 17 supplies solid fuel (for example, coal or biomass fuel in the present embodiment) from the upper side to the lower rotary table 12. The rotary table 12 crushes the supplied solid fuel between the rotary table 12 and the roller 13.

When the solid fuel is fed from the fuel supply unit 17 toward the center of the rotary table 12, the solid fuel is guided to the outer peripheral side of the rotary table 12 by the centrifugal force due to the rotation of the rotary table 12, and is brought into contact with the roller 13. It is sandwiched and crushed. The crushed solid fuel becomes crushed solid fuel, and is a carrier gas (hereinafter, referred to as primary air) introduced from a carrier gas channel (carrier gas supply unit; hereinafter referred to as primary air channel) 100a. Is wound up upward by the () and is guided to the classifying unit 16. The primary air flow path 100a supplies primary air into the housing 11 below the turntable 12 via a primary air duct 27 (see FIG. 2) connected to the housing 11. An air outlet 25 (see FIG. 2) is provided on the outer peripheral side of the rotary table 12 to let the primary air flowing in from the primary air flow path 100a flow into the space above the rotary table 12 in the housing 11. The outlet 25 is formed by a gap between the outer peripheral end of the rotary table 12 and the inner peripheral surface 11 a of the housing 11. A vane 26 (see FIG. 2) is installed above the blowout port 25, and gives a swirling force to the primary air blown out from the blowout port 25. The primary air to which the swirling force is given by the vane 26 becomes an air flow having a swirling velocity component, and guides the solid fuel crushed on the rotary table 12 to the upper classification section 16 in the housing 11. Among the pulverized solid fuel particles mixed with the primary air, those having a particle size larger than a predetermined particle size are classified by the classifying unit 16 or are dropped onto the rotary table 12 without reaching the classifying unit 16. And crushed again.

The roller 13 is a rotating body that pulverizes the solid fuel supplied from the fuel supply unit 17 to the turntable 12. The roller 13 is pressed against the upper surface of the rotary table 12 and cooperates with the rotary table 12 to crush the solid fuel.
In FIG. 1, only one roller 13 is shown as a representative, but a plurality of rollers 13 are opposed to each other at regular intervals in the circumferential direction of the rotary table 12 so as to press the upper surface of the rotary table 12. Will be placed. In the present embodiment, as shown in FIG. 5, an example will be described in which three rollers 13 are evenly arranged in the circumferential direction at an angular interval of 120° on the outer peripheral portion. The portions where the three rollers 13 are in contact with the upper surface of the rotary table 12 (the portions that are pressed) have the same distance from the center of rotation of the rotary table 12. The number of rollers is not limited to three, and may be two or less, or four or more.
A drift plate 60 (a drift portion) is provided in each of the three spaces formed between the three rollers 13 in the circumferential direction. Details of the deflector plate 60 will be described later.

The roller 13 is swingable up and down by a journal head (support portion) 45, and is supported by the upper surface of the rotary table 12 so that the roller 13 can approach and separate freely. When the rotary table 12 rotates while the outer peripheral surface of the roller 13 is in contact with the upper surface of the rotary table 12, the roller 13 receives the rotational force from the rotary table 12 and rotates together. When the solid fuel is supplied from the fuel supply unit 17, the solid fuel is pressed between the roller 13 and the rotary table 12 and is crushed to be crushed solid fuel.

The support arm 47 of the journal head 45 is supported by a support shaft 48 having an intermediate portion extending horizontally. That is, the support arm 47 is supported on the side surface of the housing 11 so as to be swingable in the vertical direction of the roller about the support shaft 48. A pressing device 49 is provided on the upper end of the support arm 47 on the vertically upper side. The pressing device 49 is fixed to the housing 11 and applies a load to the roller 13 via the support arm 47 or the like so as to press the roller 13 against the rotary table 12.

The drive unit 14 is a device that transmits a driving force to the rotary table 12 and rotates the rotary table 12 around the central axis C (see FIG. 2). The drive unit 14 generates a driving force that rotates the turntable 12.
The classifying portion 16 is provided on the upper part of the housing 11 and has a hollow, substantially inverted conical shape. The classifying unit 16 is provided with a plurality of classifying blades 16a extending in the vertical direction at the outer peripheral position thereof. The classifying blades 16a are provided in parallel around the central axis C (see FIG. 2) of the classifying unit 16 at predetermined intervals (equal intervals). Further, the classifying unit 16 has a size of the crushed solid fuel crushed by the roller 13 that is larger than a predetermined particle size (for example, 70 to 100 μm in the case of coal) (hereinafter, crushed solid fuel having a size larger than the predetermined particle size is “coarse powder”). This is a device for classifying into "fuel") and particles having a predetermined particle size or less (hereinafter, solid fuel crushed to have a particle size of the predetermined particle size or less is referred to as "fine powder fuel"). The rotary classifier that classifies by rotating the entire classification unit 16 is also called a rotary separator. A rotation driving force is applied to the classifying unit 16 by the motor 18.

The solid fuel pulverized product (pulverized solid fuel) that has reached the classification unit 16 has a large diameter of coarse powder fuel due to the relative balance between the centrifugal force generated by the rotation of the classification blade 16a and the centripetal force generated by the primary air flow. , Is blown off by the classification blade 16a, returned to the rotary table 12 and pulverized again, and the fine powder fuel is guided to the outlet 19 in the ceiling portion 42 of the housing 11.
The pulverized fuel classified by the classification unit 16 is discharged from the outlet 19 to the supply flow path 100b and is transported together with the primary air. The pulverized fuel flowing out to the supply flow path 100b is supplied to the burner section 220 of the boiler 200.

The fuel supply unit 17 is attached such that the lower end extends vertically into the housing 11 so as to penetrate the upper end of the housing 11 and the solid fuel injected from the upper portion is substantially centered on the rotary table 12. Supply. The fuel supply unit 17 is supplied with solid fuel from the coal feeder 20.

The coal feeder 20 includes a bunker 21, a transfer unit 22, and a motor 23. The transport unit 22 transports the solid fuel discharged from the lower end portion of the down spout unit 24 located immediately below the bunker 21 by the driving force applied from the motor 23, and is guided to the fuel supply unit 17 of the mill 10.
Usually, the inside of the mill 10 is supplied with primary air for carrying the pulverized solid fuel, which is a pulverized solid fuel, to increase the pressure. Fuel is held in a stacked state inside the down spout portion 24, which is a vertically extending pipe just below the bunker 21, and the fuel layer stacked inside the down spout portion 24 causes A sealing property is ensured so that the primary air and pulverized fuel do not flow back.
The supply amount of the solid fuel supplied to the mill 10 may be adjusted by the belt speed of the belt conveyor of the transport unit 22.

The blower unit 30 is a device that dries the solid fuel crushed by the rollers 13 and blows primary air for supplying to the classifying unit 16 into the housing 11.
The blower unit 30 includes a hot gas blower 30a, a cold gas blower 30b, a hot gas damper 30c, and a cold gas damper 30d in order to adjust the primary air blown to the housing 11 to an appropriate temperature.

The hot gas blower 30a is a blower that blows heated primary air supplied from a heat exchanger (heater) such as an air preheater. A hot gas damper 30c (first air blower) is provided on the downstream side of the hot gas blower 30a. The opening of the hot gas damper 30c is controlled by the controller 50. The flow rate of the primary air blown by the hot gas blower 30a is determined by the opening degree of the hot gas damper 30c.

The cold gas blower 30b is a blower that blows primary air that is the outside air at room temperature. A cold gas damper 30d is provided on the downstream side of the cold gas blower 30b. The opening degree of the cold gas damper 30d is controlled by the control unit 50. The flow rate of the primary air blown by the cold gas blower 30b is determined by the opening degree of the cold gas damper 30d.
The flow rate of the primary air is the sum of the flow rate of the primary air blown by the hot gas blower 30a and the flow rate of the primary air blown by the cold gas blower 30b, and the temperature of the primary air is the primary air blown by the hot gas blower 30a. Is determined by the mixing ratio of the primary air blown by the cold gas blower 30b and controlled by the control unit 50.
In addition, by guiding a part of the combustion gas discharged from the boiler 200 that has passed through the environmental device such as the electric dust collector through the gas recirculation blower to the primary air blown by the hot gas blower 30a to form a mixture, You may adjust the oxygen concentration of the primary air which flows in from the primary air flow path 100a.

In the present embodiment, the state detection unit 40 of the housing 11 transmits the measured or detected data to the control unit 50. The state detection unit 40 of the present embodiment is, for example, a differential pressure measurement unit, and a portion where primary air flows from the primary air flow passage 100a into the mill 10 and the supply air flow passage 100b from the inside of the mill 10 to the primary air and the fine powder fuel. The differential pressure between the outlet 19 and the outlet 19 is measured as the differential pressure in the mill 10. Due to the classification performance of the classification unit 16, the increase/decrease in the circulation amount of the fine powder fuel of the solid fuel circulating inside the mill 10 and the increase/decrease in the differential pressure in the mill 10 corresponding to this change. That is, since it is possible to adjust and manage the fine powder fuel discharged from the outlet 19 with respect to the solid fuel supplied to the inside of the mill 10, the particle size of the fine powder fuel does not affect the combustibility of the burner section 220. A large amount of pulverized fuel can be supplied to the burner section 220 provided in the boiler 200.
Further, the state detection unit 40 of the present embodiment is, for example, a temperature measurement unit, and a blower unit that blows the primary air for supplying the solid fuel crushed by the rollers 13 to the classification unit 16 into the housing 11. The temperature of the primary air whose temperature is adjusted by 30 is detected in the housing 11, and the blower unit 30 is controlled so as not to exceed the upper limit temperature. Since the primary air is cooled in the housing 11 by transporting the pulverized material while drying it, the temperature of the upper space of the housing 11 is, for example, about 60 to 80 degrees.

The control unit 50 is a device that controls each unit of the solid fuel crushing apparatus 100. The control unit 50 can control the rotation of the turntable 12 with respect to the operation of the mill 10 by transmitting a drive instruction to the drive unit 14, for example. The control unit 50 adjusts the classification performance by transmitting a drive instruction to the motor 18 of the classifying unit 16 to control the number of revolutions, thereby optimizing the differential pressure in the mill 10 and supplying the fine powder fuel. Can be stabilized. In addition, the control unit 50 adjusts the supply amount of the solid fuel supplied by the transfer unit 22 to the fuel supply unit 17 by transmitting the drive instruction to the motor 23 of the coal feeder 20, for example. You can Further, the control unit 50 can control the flow rate and temperature of the primary air by transmitting the opening degree instruction to the blower unit 30 to control the opening degree of the hot gas damper 30c and the cold gas damper 30d.

The control unit 50 includes, for example, a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), and a computer-readable storage medium. A series of processes for realizing various functions is stored in a storage medium or the like in the form of a program as an example, and the CPU reads the program into a RAM or the like to execute information processing/arithmetic processing. As a result, various functions are realized. The program is installed in a ROM or other storage medium in advance, provided in a state of being stored in a computer-readable storage medium, or delivered via wired or wireless communication means. Etc. may be applied. The computer-readable storage medium is a magnetic disk, a magneto-optical disk, a CD-ROM, a DVD-ROM, a semiconductor memory, or the like.

Next, the boiler 200 that combusts using the fine fuel supplied from the solid fuel pulverizer 100 to generate steam will be described.
The boiler 200 includes a furnace 210 and a burner section 220.

The burner unit 220 uses a primary air containing pulverized fuel supplied from the supply passage 100b and a secondary air supplied from a heat exchanger (not shown) to combust the pulverized fuel to form a flame. Is. Combustion of the pulverized fuel is performed in the furnace 210, and the high temperature combustion gas is discharged to the outside of the boiler 200 after passing through a heat exchanger (not shown) such as an evaporator, a superheater, and an economizer.

The combustion gas discharged from the boiler 200 is subjected to a predetermined treatment by an environmental device (not shown in a denitration device, an electric dust collector, etc.), and heat exchange with outside air is performed by a heat exchanger (not shown) such as an air preheater. It is carried out, is guided to a chimney (not shown) through an induction fan (not shown), and is discharged to the atmosphere. The outside air heated by heat exchange with the combustion gas in the heat exchanger is sent to the hot gas blower 30a described above.
Water supplied to each heat exchanger of the boiler 200 is heated in an economizer (not shown) and then further heated by an evaporator (not shown) and a superheater (not shown) to generate high-temperature high-pressure steam. It is sent to a turbine (not shown) and a generator (not shown) is rotationally driven to generate electricity.

Next, the deflector plate 60 will be described in detail with reference to FIGS. 3 to 6.
As shown in FIG. 4, the drift plate 60 is provided between the adjacent rollers 13 and at the same height position as the rollers 13. The same height position is a height position where the lower end (lower end edge 65a) of the drift plate 60 and the lower end of the roller 13 (closest portion to the rotary table surface) coincide with each other within a predetermined range with respect to the rotary table 12. It is. Further, the predetermined range may be set with respect to the height position of the upper end 25a of the outlet 25 around the turntable 12.
More specifically, as shown in FIG. 5, the deflector plates 60 are provided one by one in each of the three spaces formed between the three rollers 13 along the circumferential direction of the housing 11. That is, in the present embodiment, three deflector plates 60 are provided on the inner peripheral surface 11 a of the housing 11, and the deflector plates 60 are arranged at equal intervals along the circumferential direction of the housing 11. Further, each of the drift plates 60 extends a predetermined length along the circumferential direction and is fixed to the inner peripheral surface 11 a of the housing 11. Note that, in FIG. 4, one roller 13 and one deflector plate 60 are shown for the sake of illustration. Since the three deflector plates 60 have the same configuration, only one of them will be described below, and the description of the other components will be omitted.

As shown in FIG. 3, the deflector plate 60 includes a main body portion 61 protruding from the inner peripheral surface 11a of the housing 11 toward the central axis C and a fixing portion 62 fixed to the inner peripheral surface 11a of the housing 11. There is. The main body 61 includes a first inclined surface 64 that extends obliquely downward from the inner peripheral surface 11 a of the housing 11 toward the central axis C of the housing 11, and a lower portion of the first inclined surface 64 that faces the central axis C. And a second inclined surface 65 that extends obliquely upward and two third inclined surfaces that connect the side edge 64b (circumferential edge) of the first inclined surface 64 and the side edge 65b of the second inclined surface 65. 66, and the cross section in the longitudinal direction is formed in a substantially triangular shape. That is, the main body 61 has a tapered shape in which the length in the circumferential direction becomes shorter toward the central axis C. The surface of the second inclined surface 65 is covered with a wear resistant portion 63 formed of a wear resistant material. 4 and 6, the fixing portion 62 is omitted for the sake of illustration.

With respect to the rotary table 12, the lower end of the deflector plate 60 (lower edge 65a) and the lower end of the roller 13 (the portion closest to the rotary table surface) are at the same height position within a predetermined range. This predetermined range is set with respect to the height position of the upper end 25a of the air outlet 25 around the rotary table 12. Specifically, in the deflector plate 60, the lower end (lower end edge 65a described later) of the second inclined surface 65 is the same as the length of 25% of the radius of the rotary table 12 with respect to the height position of the upper end 25a of the outlet 25. A height position between the height position above the length and the height position 25% of the radius of the rotary table 12 with respect to the height position of the upper end 25a of the air outlet 25 and the height position below the same length. It is fixed to the inner peripheral surface 11a of the housing 11 so that That is, when the radius of the turntable 12 is, for example, 1 m, the second inclination is set in a range between the height position of 25 cm upward and the height position of 25 cm downward with reference to the upper end 25 a of the outlet 25. The drift plate 60 is arranged so that the lower end of the surface 65 is located. The upper end 25a of the outlet 25 is at the same height as the upper end of the rotary table 12 facing the outlet 25.

As shown in FIGS. 4 and 5, the first inclined surface 64 includes an arc-shaped upper end edge 64a extending along the circumferential direction of the inner peripheral surface 11a of the housing 11, and both ends of the upper end edge 64a in the circumferential direction. It has two side end edges 64b each extending obliquely downward in the direction of the central axis C of 11 and an arcuate lower end edge 64c connecting the inner ends 64ba of the two side end edges 64b. The side edge 64b is connected to the upper edge 66a of the third inclined surface 66. Further, the lower edge 64c is connected to the upper edge 65c of the second inclined surface 65.

The first inclined surface 64 forms an inclination angle θ1 with respect to the horizontal plane H, as shown in FIG. The inclination angle θ1 is set to be equal to or greater than the repose angle of the pulverized fixed fuel and smaller than the inclination angle θ2 described later. Specifically, the inclination angle θ1 is set to, for example, 35 degrees or more and 45 degrees or less. The inclination angle θ1 may be determined according to the distance from the flow diverter plate 60 to the turntable 12, for example.

Further, the end edges 64b on both sides of the first inclined surface 64 are respectively inner ends of the end edges 64b on both sides as approaching the central axis C with respect to the radial direction R (see FIG. 5) of the rotary table 12 and the housing 11. 64ba (the end on the side of the central axis C) are inclined so that they come close to each other. In other words, the end edges 64b on both sides of the first inclined surface 64 are respectively the inner end 64ba of one side end edge 64b and the other side end edge 64b with respect to the radial direction R of the rotary table 12 and the housing 11. Is inclined so as to approach the inner end 64ba of the. Therefore, the angle θ3 formed by the arc of the upper edge 64a of the first inclined surface 64 is formed larger than the angle θ4 formed by the arc of the lower edge 64c.

As shown in FIGS. 4 and 5, the second inclined surface 65 includes an arcuate lower end edge 65a extending along the circumferential direction of the inner peripheral surface 11a of the housing 11, and both ends of the lower end edge 65a in the circumferential direction. It has two side end edges 65b extending obliquely upward in the direction of the central axis C of 11 and an arcuate upper end edge 65c connecting the inner ends 65ba of the two side end edges 65b. The side edge 65b is connected to the lower edge 66b of the third inclined surface 66. The upper edge 65c is connected to the lower edge 64c of the first inclined surface 64.

The second inclined surface 65 makes an inclination angle θ2 with respect to the horizontal plane H, as shown in FIG. The inclination angle θ2 is larger than the inclination angle θ1 and is set so that the primary air can reach the classification unit 16 appropriately. Specifically, the inclination angle θ2 is, for example, an angle larger than 45 degrees and set to an angle of 60 degrees or less. The angle at which the primary air can be properly reached to the classifying unit 16 is derived from operating results, tests, simulations, and the like. Further, the inclination angle θ2 may be determined according to the distance from the drift plate 60 to the classifying unit 16, for example.

Further, the end edges 65b on both sides of the second inclined surface 65 are respectively inner ends of the end edges 65b on both sides as approaching the central axis C with respect to the radial direction R (see FIG. 5) of the rotary table 12 and the housing 11. 65ba (the end on the side of the central axis C) are inclined so that they approach each other. In other words, the end edges 65b on both sides of the second inclined surface 65 are respectively the inner end 65ba of one side end edge 65b and the other side end edge 65b with respect to the radial direction R of the rotary table 12 and the housing 11. Is inclined so as to approach the inner end 65ba of the. Therefore, the angle formed by the arc of the lower edge 65a of the second inclined surface 65 (the angle having the same magnitude as the angle θ3 formed by the arc of the upper edge 64a of the first inclined surface 64) is the angle formed by the arc of the upper edge 65c ( The angle is the same as the angle θ4 formed by the arc of the lower edge 64c of the first inclined surface 64).

As shown in FIG. 4, the third inclined surface 66 is formed in a triangular shape in plan view connecting the side end edges 64b, 65b of the first inclined surface 64 and the second inclined surface 65. The third inclined surface 66 is formed to incline with respect to a vertical plane extending along the radial direction R of the rotary table 12 and the housing 11. In other words, since the third inclined surface 66 is formed so that the angle θ3 is larger than the angle θ4, the third inclined surface 66 is formed so as to be inclined with respect to the vertical plane extending along the radial direction R.

The wear resistant portion 63 is formed of a wear resistant material such as high chromium cast iron or ceramics. As shown in FIG. 6, the wear resistant portion 63 covers almost the entire area of the second inclined surface 65. The wear-resistant portion 63 is configured by combining the panel-shaped divided wear-resistant portions 63a so that the gap does not become large. In the wear resistant portion 63, the adjacent side surfaces of the divided wear resistant portion 63a may be overlapped with each other in a key shape or a slope shape. With this configuration, it is possible to allow a gap to occur while allowing the thermal expansion of the divided wear resistant portion 63a.
Each of the divided wear resistant portions 63a is fixed to the body portion 61 by a penetrating pin 68. As described above, by configuring the wear resistant portion 63 by the plurality of divided wear resistant portions 63a, the work of attaching the wear resistant portion 63 can be facilitated and the deformation due to the difference in thermal expansion can be suppressed. ..

As shown in FIG. 3, the fixing portion 62 is a plate-shaped member that extends substantially vertically downward from almost the entire lower edge 65a of the second inclined surface 65. That is, the fixed portion 62 extends along the inner peripheral surface 11 a of the housing 11. A plurality of through-holes 69 penetrating in the plate thickness direction are formed in the fixing portion 62. The plurality of through holes 69 are formed at predetermined intervals along the circumferential direction. A bolt 70 is inserted into each of the plurality of through holes 69. The bolt 70 inserted through the through hole 69 is fastened and fixed to a boss portion (not shown) provided on the inner peripheral surface 11 a of the housing 11 or a welded nut (not shown). That is, the drift plate 60 is fastened and fixed to the inner peripheral surface 11 a of the housing 11 by the bolts 70.

Next, the flow of fluid generated in the housing 11 will be described.
As shown in FIG. 3, the primary air supplied from the primary air flow path 100 a passes through the air outlet 25 which is a gap formed between the rotary table 12 and the housing 11, and is pulverized on the rotary table 12. The crushed solid fuel (including the fine powder fuel and the coarse powder fuel) is conveyed to the classifying unit 16. In this way, in the housing 11, a flow of primary air containing the pulverized solid fuel (hereinafter, referred to as “updraft”) that passes through the air outlet 25 and goes to the upper classifying unit 16 is generated. Part of the rising airflow circulates along the second inclined surface 65. Since the second inclined surface 65 extends obliquely upward toward the central axis C of the housing 11, the upward airflow flowing along the second inclined surface 65 is guided in the central axis C direction of the housing.
On the other hand, the coarse fuel that is classified by the classifying unit 16 and returned to the rotary table 12 drops from the upper side to the lower side, so that a downward airflow is generated in the housing 11. Part of the descending airflow generated by the falling coarse powder fuel flows along the first inclined surface 64. Since the first inclined surface 64 extends obliquely downward toward the central axis C of the housing 11, the downdraft flowing along the first inclined surface 64 is guided in the central axis C direction of the housing 11.
As described above, since both the updraft and the downdraft are guided in the direction of the central axis C of the housing 11, the position where the updraft and the downdraft generated in the housing 11 interfere or collide with each other is inside the housing 11. It is not a narrow space area along the peripheral surface 11a, but a large space area on the central area side (area A in FIG. 3) in the housing 11. Therefore, the position where the ascending airflow and the descending airflow interfere or collide with each other can be set to a position where the influence of the airflow in the housing 11 is small. The ascending airflow continues to ascend even after colliding with or colliding with the descending airflow, and reaches the classifying unit 16. Further, the descending airflow continues to descend even after colliding with or colliding with the ascending airflow, and reaches the turntable 12.

According to this embodiment, the following operational effects are achieved.

When the deflector plate 60 is not provided on the inner peripheral surface 11a of the housing 11, the main flow of the primary air that has passed through the outlet 25 continues to rise along the inner peripheral surface 11a. On the other hand, the coarse fuel is repelled by the classifying blade 16a of the classifying unit 16, so that a descending air flow that drops along the inner peripheral surface 11a of the housing 11 is generated. Therefore, the position where the ascending airflow and the descending airflow mainly interfere or collide with each other becomes a narrow space area along the inner peripheral surface 11a of the housing 11, and the outer peripheral area of the housing 11 that greatly affects the pressure loss in the housing 11. Will be.
In the present embodiment, the position where the ascending airflow and the descending airflow generated in the housing 11 interfere or collide with each other is the area of the large-volume space on the central area side of the housing 11. As a result, the positions where they interfere or collide with each other can be set to positions that are less affected by the air flow in the housing 11, and thus pressure loss in the housing 11 can be suppressed. Therefore, the increase in power of the mill 10 can be suppressed, and the pulverized coal can be suitably carried out, so that the production efficiency of the pulverized coal can be improved.

Further, in the present embodiment, the deflector plate 60 is provided at the same height position as the roller 13. That is, the deflector plate 60 is provided near the outlet 25. Specifically, the lower end (lower end edge 65a) of the second inclined surface 65 is higher than the height position of the upper end 25a of the outlet 25 by the same length as 25% of the radius of the rotary table 12. Biased to a height position between the height position and the height position of the upper end 25a of the air outlet 25 and a height position that is 25% of the radius of the rotary table 12 and the same length downward. A plate 60 is arranged. As a result, the primary air passing through the air outlet 25 of the housing 11 immediately reaches the deflector plate 60, so that the upward airflow can be reliably guided to the central axis C side of the housing 11. Therefore, the position where the ascending airflow and the ascending airflow interfere or collide with each other can be surely set as the area of the large-volume space on the central area side in the housing 11. Therefore, the position where the ascending airflow and the descending airflow interfere or collide with each other can be set to a position where the influence of the airflow in the housing 11 is small, so that the pressure loss in the housing 11 can be suppressed. Therefore, since it is possible to suppress an increase in the blowing power of the primary air of the mill 10, it is possible to improve the production efficiency of the pulverized fuel pulverized to have a predetermined particle size or less.

Further, in the present embodiment, in the deflector plate 60, the side edges 64b and 65b (in other words, the third inclined surface 66) in the circumferential direction of the first inclined surface 64 and the second inclined surface 65 are the same as those of the turntable 12. The inner ends 64ba, 65ba of the side end edges 64b, 65b are inclined with respect to the radial direction R so that the inner ends 64ba, 65ba are closer to each other, and the angle θ3 is larger than the angle θ4. That is, the side edges 64b, 65b of the first inclined surface 64 and the second inclined surface 65 are inclined along the roller 13 adjacent to the drift portion. As a result, even when the deflector plate 60 is arranged near the outlet 25, it is possible to prevent the deflector plate 60 and the roller 13 from interfering with each other.

Both the deflector plate 60 and the roller 13 are provided so as to project in the central axis C direction of the housing 11 and the rotary table 12. For this reason, the inner ends 64ba and 65ba of the side end edges 64b and 65b of the first inclined surface 64 and the second inclined surface 65 of the deflector plate 60 are most likely to interfere with the roller 13. Therefore, in order to increase the areas of the first inclined surface 64 and the second inclined surface 65, the positions of the inner ends 64ba and 65ba are positions that do not interfere with the roller 13 and that are close to the roller 13. And need to.
In this embodiment, the deflector plate 60 and the roller 13 are less likely to interfere with each other. Therefore, when the inner ends 64ba and 65ba are considered to be at the same position, the angle θ3 is equal to the angle θ4 (in other words, the circumferential end edges of the first inclined surface 64 and the second inclined surface 65 are the same). Compared with the configuration in which the rotary table 12 extends in the radial direction R), the configuration of the present embodiment in which the angle θ3 is larger than the angle θ4 is the first inclined surface 64 and the second inclined surface. The area of 65 can be enlarged. Therefore, more ascending airflow and more descending airflow can be guided toward the center of the housing 11, so that the pressure loss in the housing 11 can be further suppressed.

Also, the roller 13 needs to be removed from the housing 11 at the time of maintenance. When removing the roller 13 from the housing 11, the roller 13 is removed by rotating it upward. In the present embodiment, as described above, on the inner peripheral surface 11a of the housing 11, the deflector plates 60 are not provided over the entire circumference but are provided at a plurality of positions between the adjacent rollers 13, and the deflector plates 60 and the rollers 13 are provided. Since they are provided at the same height position, they do not interfere with the deflector plate 60 when the roller 13 is removed. Therefore, the work of removing the roller 13 can be facilitated.

In the present embodiment, the acute inclination angle θ1 formed by the first inclined surface 64 and the horizontal plane H is smaller than the acute inclination angle θ2 formed by the second inclined surface 65 and the horizontal plane H. That is, the upward airflow along the second inclined surface 65 has a stronger vertical guiding force than the downward airflow along the first inclined surface 64. As a result, the flow velocity of the updraft becomes higher than that of the downdraft. Therefore, the crushed pulverized solid fuel can be reliably transported to the classifying unit 16 provided above by the primary air. If the inclination angle θ2 is set too large, the position where the ascending airflow and the descending airflow collide with each other becomes a high position, which may be a position close to the classifying unit 16. If they interfere or collide with each other at a position close to the classifying unit 16, the coarse fuel repelled by the classifying unit 16 may be conveyed to the classifying unit 16 again by the ascending air current, and the classification performance may be reduced. There is. Therefore, the inclination angle θ2 is preferably 60 degrees or less.

Further, when the drift plate 60 is fixed to the housing 11, if the position where the drift plate 60 is provided is, for example, a height position equivalent to the height of the worker or a height position higher than the height of the worker. The worker may access the fixed portion between the drift portion and the casing from the lower side. In the present embodiment, the drift plate 60 is fixed to the housing by the fixing portion 62 extending downward from the lower end of the second inclined surface 65. This makes it difficult for the worker to interfere with the first inclined surface 64 and the second inclined surface 65 when the work of fixing the deflector plate 60 to the inner peripheral surface 11a of the housing 11 is performed. Therefore, the fixing work can be facilitated.
Further, in the present embodiment, the fixing portion 62 extends downward from the lower end of the second inclined surface 65. Therefore, the solid fuel can be prevented from accumulating on the fixed portion 62.

Further, in the present embodiment, the second inclined surface 65 guides the primary air containing the pulverized pulverized solid fuel, and is therefore easily worn. Further, in the present embodiment, since the second inclined surface 65 is located in the vicinity of the air outlet 25, the primary air having a high flow velocity is guided, so that it is more easily worn. In the present embodiment, the second inclined surface 65 is covered with the wear resistant portion 63. As a result, when the primary air passes through the air outlet 25 which is a gap formed between the rotary table 12 and the housing 11 and conveys the pulverized solid fuel to the classifying unit 16 as an ascending airflow, It is possible to suppress the abrasion of the second inclined surface 65 which is likely to collide with the pulverized solid fuel contained in.

It should be noted that the present invention is not limited to the above-described embodiment, and can be appropriately modified without departing from the scope of the invention.
For example, in the above embodiment, an example in which the wear resistant portion 63 is provided so as to cover the second inclined surface 65 has been described, but the present invention is not limited to this. For example, the abrasion resistant portion 63 may be provided so as to cover both the first inclined surface 64 and the second inclined surface 65, or the abrasion resistant portion 63 may be provided only on the first inclined surface 64.

Further, in the above embodiment, an example in which the fixing portion 62 is formed to extend downward from the lower end edge 65a of the second inclined surface 65 has been described, but the present invention is not limited to this. For example, the fixing portion 62 may be provided so as to extend upward from the upper end edge 64a of the first inclined surface 64. Further, the fixing portion 62 may be provided so as to extend both upward from the upper end edge 64a of the first inclined surface 64 and downward from the lower end edge 65a. Further, the main body 61 may be fixed to the inner peripheral surface 11a of the housing 11 by welding or the like without providing the fixing portion 62.

Further, in the above embodiment, an example in which the main body 61 has a substantially triangular cross-sectional shape has been described, but the present invention is not limited to this. For example, a vertical plane is provided between the lower end edge 64c of the first inclined surface 64 and the upper end edge 65c of the second inclined surface 65, and the main body 61 has a substantially trapezoidal cross section or an elliptical shape with rounded corners. You may form so that it may become.

In addition, in the above embodiment, an example in which the deflector plate 60 is provided in each of the three spaces formed between the rollers 13 is described, but the present invention is not limited to this. For example, a plurality of drift plates 60 may be provided in each space formed between the rollers 13. In addition, the non-uniform flow plate 60 may not be provided in all the spaces formed between the rollers 13, and a space in which the non-uniform flow plate 60 is provided and a space in which the non-uniform flow plate 60 is not provided may be provided.

1: Boiler system 10: Mill (crusher)
11: Housing
11a: inner peripheral surface 12: rotary table (crushing table)
13: Roller (crushing roller)
14: Drive part 16: Classification part 16a: Classification blade 17: Fuel supply part 18: Motor 19: Outlet 20: Coal feeder 21: Bunker 22: Transfer part 23: Motor 24: Downspout part 25: Outlet port 26: Vane 27: Primary air duct 30: Air blower 30a: Hot gas blower 30b: Cold gas blower 30c: Hot gas damper 30d: Cold gas damper 40: Status detector 41: Bottom portion 42: Ceiling portion 45: Journal head (support portion)
47: Support arm 48: Support shaft 49: Pressing device 50: Control part 60: Drift plate (diffusion part)
61: body part 62: fixed part 63: wear resistant part 63a: divided wear resistant part 64: first inclined surface 64a: upper edge 64b: side edge 64ba: inner end 64c: lower edge 65: second inclined surface 65a: Lower edge 65b: Side edge 65ba: Inner edge 65c: Upper edge 66: Third inclined surface 66a: Upper edge 66b: Lower edge 68: Pin 69: Through hole 70: Bolt 100: Solid fuel pulverizer 100a: Primary air flow Road (transport gas supply section)
100b: Supply flow path 200: Boiler 210: Furnace 220: Burner section

Claims (8)

1. A case that extends vertically and forms an outer shell,
   A rotary table which is arranged apart from the inner peripheral surface of the housing and on which the solid fuel supplied into the housing is placed;
   A plurality of crushing rollers supported by a support portion extending from the inner peripheral surface toward the center of the rotary table and crushing solid fuel placed on the rotary table into crushed solid fuel;
   A classification unit provided on the vertically upper side of the rotary table for classifying the pulverized solid fuel into the pulverized solid fuel having a particle size larger than a predetermined particle size and the pulverized solid fuel having a particle size smaller than a predetermined particle size,
   A carrier gas for supplying the crushed solid fuel to the classifying unit is supplied to the inside of the casing, and a carrier gas supply unit is provided vertically below the rotary table.
   A first inclined surface extending obliquely downward toward a central axis extending vertically in the vertical direction of the housing and a second inclination positioned vertically downward from the first inclined surface and extending obliquely upward toward the central axis. And a drift portion provided on the inner peripheral surface,
   A plurality of the crushing rollers are arranged along the circumferential direction of the rotary table,
   The uneven flow portion is provided between the plurality of crushing rollers at the same height position as the crushing rollers,
   The circumferential end edges of the first slanted surface and the second slanted surface are the radial inner ends of the one end of the rotary table in the radial direction, respectively. A crusher that is inclined so as to approach the radially inner end of the edge.
2. A casing that forms the outer shell,
   It has a rotary table which is arranged apart from the inner peripheral surface of the casing, and on which the solid fuel supplied into the casing is placed, and the solid fuel is crushed and crushed on the rotary table. A crushing unit for fuel,
   A classification unit provided on the vertically upper side of the rotary table for classifying the pulverized solid fuel into the pulverized solid fuel having a particle size larger than a predetermined particle size and the pulverized solid fuel having a particle size smaller than a predetermined particle size,
   A carrier gas for supplying the crushed solid fuel to the classifying unit is supplied to the inside of the casing, and a carrier gas supply unit is provided vertically below the rotary table.
   A first inclined surface extending obliquely downward toward a central axis extending vertically in the vertical direction of the housing and a second inclination positioned vertically downward from the first inclined surface and extending obliquely upward toward the central axis. And a drift portion provided on the inner peripheral surface,
   A crusher in which an acute angle formed by the first inclined surface and the horizontal surface is smaller than an acute angle formed by the second inclined surface and the horizontal surface.
3. The drift portion is arranged such that a vertical lower end of the second inclined surface is located at a predetermined height position,
   The predetermined height position is above the height position of the upper end of the gap formed between the rotary table and the inner peripheral surface of the housing by 25% of the radius of the rotary table. Or a height position between the height position of the upper end of the gap and the height position 25% lower than the radius of the rotary table with respect to the height position of the upper end of the gap. The crusher described in.
4. The drift portion has a fixing portion fixed to the inner peripheral surface,
   The crusher according to claim 1, wherein the fixing portion extends vertically downward from a lower end of the second inclined surface.
5. The crusher according to any one of claims 1 to 4, wherein a wear resistant portion is provided on the second inclined surface.
6. A crusher according to any one of claims 1 to 5,
   A boiler system comprising: a boiler that combusts solid fuel pulverized by the pulverizer to generate steam.
7. A method of operating the crusher,
   The crusher is
   A case that extends vertically and forms an outer shell,
   A rotary table which is arranged apart from the inner peripheral surface of the housing and on which the solid fuel supplied into the housing is placed;
   A plurality of crushing rollers supported by a support portion extending from the inner peripheral surface toward the center of the rotary table and crushing solid fuel placed on the rotary table into crushed solid fuel;
   A classification unit provided on the vertically upper side of the rotary table for classifying the pulverized solid fuel into the pulverized solid fuel having a particle size larger than a predetermined particle size and the pulverized solid fuel having a particle size smaller than a predetermined particle size,
   A carrier gas for supplying the crushed solid fuel to the classifying unit is supplied to the inside of the casing, and a carrier gas supply unit is provided vertically below the rotary table.
   A first inclined surface extending obliquely downward toward a central axis extending vertically in the vertical direction of the housing and a second inclination positioned vertically downward from the first inclined surface and extending obliquely upward toward the central axis. And a drift portion provided on the inner peripheral surface,
   A plurality of the crushing rollers are arranged along the circumferential direction of the rotary table,
   The uneven flow portion is provided between the plurality of crushing rollers at the same height position as the crushing rollers,
   The circumferential end edges of the first slanted surface and the second slanted surface are the radial inner ends of the one end of the rotary table in the radial direction, respectively. Inclined so as to approach the inner end in the radial direction of the edge,
   Guiding the carrier gas supplied from the carrier gas supply unit in the direction of the central axis along the second inclined surface;
   Guiding the crushed solid fuel returning from the classification unit to the rotary table in the direction of the central axis along the first inclined surface.
8. A method of operating the crusher,
   The crusher is
   A casing that forms the outer shell,
   It has a rotary table which is arranged apart from the inner peripheral surface of the casing, and on which the solid fuel supplied into the casing is placed, and the solid fuel is crushed and crushed on the rotary table. A crushing unit for fuel,
   A classification unit provided on the vertically upper side of the rotary table for classifying the pulverized solid fuel into the pulverized solid fuel having a particle size larger than a predetermined particle size and the pulverized solid fuel having a particle size smaller than a predetermined particle size,
   A carrier gas for supplying the crushed solid fuel to the classifying unit is supplied to the inside of the casing, and a carrier gas supply unit is provided vertically below the rotary table.
   A first inclined surface extending obliquely downward toward a central axis extending vertically in the vertical direction of the housing and a second inclination positioned vertically downward from the first inclined surface and extending obliquely upward toward the central axis. And a drift portion provided on the inner peripheral surface,
   The acute angle formed by the first inclined surface and the horizontal plane is smaller than the acute angle formed by the second inclined surface and the horizontal plane,
   Guiding the carrier gas supplied from the carrier gas supply unit in the direction of the central axis along the second inclined surface;
   Guiding the crushed solid fuel returning from the classification unit to the rotary table in the direction of the central axis along the first inclined surface.

Images