WO2024135079A1 - Drift structure, crusher, and method for assembling crusher - Google Patents

Abstract

Provided is a drift structure, a crusher, and a method for assembling a crusher with which the frequency of maintenance can be reduced. Provided is a drift structure (60) for drifting a conveyance gas blown up from below, inside a housing (11) of a crusher, the drift structure comprising a drift member (70) having a block shape. The drift member (70) has a downward inclination surface (71) extending obliquely upward toward a central axis extending in the vertical direction of the housing (11), and onto which the conveyance gas is blown, and a hanging part (76) that is hung on a hook part (93) provided on the inner wall of the housing (11).

Description

Flow deflection structure, crusher, and crusher assembly method

This disclosure relates to a flow deflection structure, a crusher, and a method for assembling the crusher.

In order to deflect the flow of conveying gas blown up from around the grinding table of the mill toward the central axis extending in the up-down direction (vertical direction) of the mill, thereby reducing the vertically upward velocity component of the conveying gas, promoting gravitational classification of the blown-up pulverized solid fuel, reducing the amount of coarse powder that reaches the classifier installed at the top of the mill, and improving the classification performance of the classifier, a deflection structure (deflection plate) may be provided on the inner wall of the mill housing (Patent Document 1).
The deflector plate also has the effect of preventing the coarse powder from rising up the upstream stream of the conveying gas before being re-ground by flowing near the inner wall of the mill where the coarse powder circulates downward.

The conveying gas blown up from the periphery of the grinding table flows at a relatively high speed inside the mill, and as a result, the lower surface of the deflection plate is subjected to a very strong erosion action as the conveying gas containing the pulverized solid fuel is blown at high speed, causing the lower surface of the deflection plate to wear out easily.
In addition, the underside of the deflection plate is close to the grinding table and is therefore susceptible to impacts from contact with unground coarse solid fuel and foreign matter, and the environment in which the underside of the deflection plate is exposed is extremely severe.

JP 2020-121283 A

In conventional deflector plates, wear was prevented by attaching a panel-shaped liner (divided wear-resistant portion) with excellent wear and impact resistance to the deflector plate.

However, with panel-type liners, it is difficult to ensure a sufficient plate thickness to withstand wear, and wear countermeasures are not sufficient, requiring frequent maintenance.
Even if a highly wear-resistant ceramic liner is used, it can still be easily destroyed by collision with a foreign object, so the frequency of maintenance does not change significantly.

The present disclosure has been made in consideration of these circumstances, and aims to provide a deflection structure, a crusher, and a method for assembling a crusher that can reduce the frequency of maintenance.

In order to solve the above problems, the flow deflection structure, the crusher, and the crusher assembly method of the present disclosure employ the following measures.
In other words, the flow deflection structure according to one embodiment of the present disclosure is a flow deflection structure that deflects conveying gas blown up from below inside the housing of a crusher, and includes a block-shaped flow deflection member, which extends diagonally upward toward a central axis extending in the vertical direction of the housing and has a first inclined surface onto which the conveying gas is blown, and a hook portion that hooks onto a hooked portion on the inner wall of the housing.

The crusher according to one aspect of the present disclosure includes the above-mentioned deflection structure and the housing having the hook portion.

A method of assembling a pulverizer according to one aspect of the present disclosure is a method of assembling the above-mentioned pulverizer, in which the flow deflection member is suspended and moved, and the hooking portion of the flow deflection member is hooked onto the hooked portion of the housing.

This disclosure makes it possible to reduce the frequency of maintenance.

1 is a schematic configuration diagram of a power plant according to an embodiment of the present disclosure. FIG. 1 is a perspective view of a mill according to one embodiment of the present disclosure. FIG. 2 is a perspective view of a flow deflection structure according to an embodiment of the present disclosure. FIG. 2 is a perspective view of a flow deflection structure according to an embodiment of the present disclosure. FIG. 2 is a perspective view of a drift member having a through hole and the like. FIG. 2 is a longitudinal sectional view of the flow deflection structure taken along a plane passing through a flow deflection member having through holes and the like. FIG. 2 is a perspective view of a drift member that does not have a through hole or the like. FIG. 2 is a longitudinal sectional view of the flow deflection structure taken along a plane passing through a flow deflection member having no through holes or the like. FIG. 11 is a perspective view of a flow drift member according to a third modified example of the flow drift member. 13 is a vertical cross-sectional view of a drift member according to a first modified example of the hook portion. FIG. 1 is a perspective view illustrating a method of assembling a pulverizer according to an embodiment of the present disclosure; FIG. FIG. 13 is a perspective view of a state in which a sling is hung on a drift member having a through hole. FIG. 13 is a perspective view of a state in which an eyebolt is attached to a drift member that does not have a through hole.

Below, the flow deflection structure, the crusher, and the crusher assembly method according to one embodiment of the present disclosure will be described with reference to the drawings.

[Power plant configuration]
As shown in FIG. 1 , the power plant 1 includes a solid fuel pulverizer 100 and a boiler 200 .
In the following explanation, "upper" refers to the vertically upward direction, and "upper" in terms such as upper part and upper surface refers to the vertically upward part. Similarly, "lower" refers to the vertically downward part, and the vertical direction is not precise and may include errors.

The solid fuel pulverizing device 100 of this embodiment is a device that pulverizes solid fuel, such as biomass fuel or coal, generates pulverized fuel, and supplies it to a burner (combustion device) 220 of a boiler 200.
The power plant 1 including the solid fuel pulverizer 100 and the boiler 200 shown in FIG. 1 is equipped with one solid fuel pulverizer 100, but it may also be a system equipped with multiple solid fuel pulverizers 100 corresponding to each of the multiple burners 220 of one boiler 200.

The solid fuel pulverizing device 100 of this embodiment includes a mill (pulverizer) 10, a bunker (storage section) 21, a coal feeder (fuel supplier) 25, a blower (carrier gas supplier) 30, a status detector 40, and a controller 50.

The mill 10, which pulverizes solid fuel such as coal or biomass fuel to be supplied to the boiler 200 into fine fuel, which is a finely powdered solid fuel, may be of a type that pulverizes only coal, may be of a type that pulverizes only biomass fuel, or may be of a type that pulverizes biomass fuel together with coal.
Here, biomass fuels are organic resources derived from renewable living organisms, such as thinned wood, waste wood, driftwood, grass, waste, sludge, tires, and recycled fuels (pellets and chips) made from these materials, but are not limited to the ones presented here.Biomass fuels are carbon neutral, meaning they do not emit carbon dioxide, a greenhouse gas, because they capture carbon dioxide during the biomass growth process, and various uses for them are being considered.

The mill 10 comprises a housing 11, a grinding table 12, grinding rollers 13, a reducer (drive transmission unit) 14, a mill motor (drive unit) 15 connected to the reducer 14 and driving the grinding table 12 to rotate, a rotary classifier (classification unit) 16, a coal supply pipe (fuel supply unit) 17, and a classifier motor 18 that drives the rotary classifier 16 to rotate.
The housing 11 is a cylindrical case having a central axis along an axis X extending in the vertical direction, and contains the crushing table 12 , the crushing rollers 13 , the rotary classifier 16 , and the coal supply pipe 17 .
As shown in FIG. 2, an opening 11a is formed in the peripheral wall of the housing 11, and the crushing roller 13 is arranged so as to be inserted from the opening 11a along the radial direction of the housing 11.

As shown in FIG. 1, a coal feed pipe 17 is attached to the center of the ceiling 42 of the housing 11. This coal feed pipe 17 supplies solid fuel guided from the bunker 21 via the coal feeder 25 into the housing 11, and is positioned vertically at the center of the housing 11 with its lower end extending into the interior of the housing 11.

A reduction gear 14 is installed near the bottom surface 41 of the housing 11, and the grinding table 12 is arranged to rotate freely around the axis X by the driving force transmitted from a mill motor 15 connected to this reduction gear 14.
The grinding table 12 is a circular member in a plan view, and is arranged so that the lower end of the coal supply pipe 17 faces the grinding table 12. The upper surface of the grinding table 12 may have an inclined shape that is low in the center and high toward the outside, and the outer periphery may have a shape that is bent upward. The coal supply pipe 17 supplies solid fuel (for example, coal or biomass fuel in this embodiment) from above toward the grinding table 12 below, and the grinding table 12 pinches the supplied solid fuel between the grinding roller 13 and grinds it.

When solid fuel is fed from the coal feed pipe 17 toward the center of the grinding table 12, the centrifugal force generated by the rotation of the grinding table 12 guides the solid fuel to the outer periphery of the grinding table 12, where it is pinched and ground between the grinding table 12 and the grinding rollers 13. The ground solid fuel is guided from the carrier gas flow path (hereinafter referred to as the primary air flow path) 110, and is blown upward by the carrier gas (hereinafter referred to as the "primary air") blown out from the carrier gas outlet (outlet) 12b, and is guided to the rotary classifier 16.
As shown in Fig. 2, an outlet 12b is provided between the outer peripheral surface of the grinding table 12 and the inner peripheral surface of the housing 11, through which the primary air flowing in from the primary air passage 110 flows out into the space above the grinding table 12 in the housing 11. A swirl blade 12a is provided on the outer peripheral side of the grinding table 12 located at the outlet of the outlet 12b, and applies a swirling force to the primary air blown upward from the outlet 12b. The primary air given a swirling force by the swirl blade 12a becomes an airflow having a swirling velocity component, and conveys the solid fuel pulverized on the grinding table 12 to the rotary classifier 16 located at the upper part of the housing 11. Among the pulverized solid fuel, particles larger than a predetermined particle size are classified by the rotary classifier 16, or fall without reaching the rotary classifier 16, are returned to the grinding table 12, and are pulverized again between the grinding table 12 and the grinding roller 13.

The crushing roller 13 is a rotating body that crushes the solid fuel supplied onto the crushing table 12 from the coal supply pipe 17. The crushing roller 13 is pressed against the upper surface of the crushing table 12 and cooperates with the crushing table 12 to crush the solid fuel.
1 shows only one representative crushing roller 13, but multiple crushing rollers 13 are arranged at regular intervals in the circumferential direction so as to press against the upper surface of the crushing table 12. For example, three crushing rollers 13 are arranged at equal intervals in the circumferential direction on the outer periphery at angular intervals of 120°. In this case, the portions where the three crushing rollers 13 come into contact with the upper surface of the crushing table 12 (pressing portions) are equidistant from the rotation center axis of the crushing table 12.

The crushing roller 13 is capable of swinging and displacing up and down by a journal head 45 , and is supported so as to be able to move toward and away from the upper surface of the crushing table 12 .
When the grinding table 12 rotates with the outer circumferential surface of the grinding roller 13 in contact with the solid fuel on the upper surface of the grinding table 12, the grinding roller 13 receives a rotational force from the grinding table 12 and rotates with the grinding table 12.
When solid fuel is supplied from the coal supply pipe 17, the solid fuel is pressed and crushed between the crushing roller 13 and the crushing table 12. This pressing force is called the crushing load.

A support arm 47 of the journal head 45 is supported on the side surface of the housing 11 by a support shaft 48 whose middle portion is aligned horizontally so that the crushing roller 13 can be swung and displaced up and down around the support shaft 48.
A pressing device (crushing load applying unit) 46 is provided at the upper end of the support arm 47. The pressing device 46 is fixed to the housing 11, and applies a crushing load to the crushing roller 13 via the support arm 47, etc., so as to press the crushing roller 13 against the crushing table 12. The crushing load is applied, for example, by a hydraulic cylinder (not shown) that operates by the pressure of hydraulic oil supplied from a hydraulic device (not shown) installed outside the mill 10. The crushing load may also be applied by the repulsive force of a spring (not shown).

The reducer 14 is connected to the mill motor 15 and transmits the driving force of the mill motor 15 to the grinding table 12, causing the grinding table 12 to rotate around its central axis.

The rotary classifier (classifying section) 16 is provided at the upper part of the housing 11 and has a hollow inverted cone-like outer shape.
The rotary classifier 16 is provided with a plurality of blades 16a extending in the vertical direction around the outer periphery of the rotary classifier 16. The blades 16a are provided at predetermined intervals (equally spaced) around the central axis of the rotary classifier 16.
The rotary classifier 16 is a device that classifies the solid fuel pulverized by the grinding table 12 and the grinding rollers 13 (hereinafter, the pulverized solid fuel is referred to as "pulverized fuel") into particles larger than a predetermined particle size (for example, 70 to 100 μm for coal) (hereinafter, pulverized fuel exceeding the predetermined particle size is referred to as "coarse pulverized fuel") and particles smaller than the predetermined particle size (hereinafter, pulverized fuel smaller than the predetermined particle size is referred to as "fine pulverized fuel").
The rotary classifier 16 is provided with a rotational driving force by a classifier motor 18 controlled by a control unit 50 , and rotates around a coal supply pipe 17 around a cylindrical axis (not shown) extending in the vertical direction of the housing 11 .
The classifying section may be a fixed classifier having a fixed hollow inverted cone-shaped casing and a plurality of fixed swirling vanes on the outer periphery of the casing instead of the blades 16a.

When the pulverized fuel reaches the rotary classifier 16, due to the relative balance between the centrifugal force generated by the rotation of the blades 16a and the centripetal force of the primary air flow, large diameter coarse pulverized fuel particles are knocked down by the blades 16a and returned to the grinding table 12 for re-pulverization, while the fine pulverized fuel is directed to the outlet port 19 in the ceiling 42 of the housing 11. The fine pulverized fuel classified by the rotary classifier 16 is discharged together with the primary air from the outlet port 19 into the fine fuel supply passage (fine fuel supply pipe) 120 and supplied to the burner 220 of the boiler 200.

The coal supply pipe 17 is attached so that its lower end extends vertically into the interior of the housing 11 so as to penetrate the ceiling portion 42 of the housing 11, and supplies solid fuel fed from the top of the coal supply pipe 17 to the center of the grinding table 12. A coal supply machine 25 is connected to the upper end of the coal supply pipe 17, and solid fuel is supplied.

The coal feeder 25 is connected to the bunker 21 by a downspout 22, which is a pipe extending in the vertical direction from the lower end of the bunker 21. A valve (coal gate, not shown) for switching the discharge state of the solid fuel from the bunker 21 may be provided in the middle of the downspout 22.
The coal feeder 25 includes a transport unit 26 and a coal feeder motor 27. The transport unit 26 is, for example, a belt conveyor, and transports the solid fuel discharged from the lower end of the downspout 22 to the upper part of the coal feeder pipe 17 by the driving force of the coal feeder motor 27, and inputs it into the inside. The amount of solid fuel supplied to the mill 10 is controlled by a signal from the control unit 50, for example, by adjusting the movement speed of the belt conveyor of the transport unit 26.

Typically, primary air is supplied inside the mill 10 to transport pulverized fuel to the burner 220, and the pressure therein is higher than that of the coal feeder 25 and the bunker 21.
The fuel is layered inside the downspout 22 that connects the bunker 21 and the coal feeder 25. This solid fuel layer ensures a sealing property (material seal) to suppress the backflow of primary air and pulverized fuel from the mill 10 toward the bunker 21.

The blower section 30 is a device that blows primary air into the housing 11 to dry the pulverized fuel and to transport the fuel to the rotary classifier 16 .
In order to appropriately adjust the flow rate and temperature of the primary air blown into the housing 11, in this embodiment, the blower 30 includes a primary air fan (PAF) 31, a hot gas flow path 30a, a cold gas flow path 30b, a hot gas damper 30c, and a cold gas damper 30d.

The hot gas flow path 30a supplies a part of the air sent out from the primary air fan 31 as hot gas that has been heated by passing through an air preheater (heat exchanger) 34. A hot gas damper 30c is provided in the hot gas flow path 30a.
The opening degree of the hot gas damper 30c is controlled by the control unit 50. The flow rate of the hot gas supplied from the hot gas flow path 30a is determined by the opening degree of the hot gas damper 30c.

The cold gas flow passage 30b supplies, as cold gas at room temperature, a portion of the air sent out from the primary air ventilator 31. A cold gas damper 30d is provided in the cold gas flow passage 30b.
The opening degree of the cold gas damper 30d is controlled by the control unit 50. The flow rate of the cold gas supplied from the cold gas passage 30b is determined by the opening degree of the cold gas damper 30d.

In this embodiment, the flow rate of the primary air is the sum of the flow rate of the hot gas supplied from the hot gas flow path 30a and the flow rate of the cold gas supplied from the cold gas flow path 30b, and the temperature of the primary air is determined by the mixing ratio of the hot gas supplied from the hot gas flow path 30a and the cold gas supplied from the cold gas flow path 30b, and is controlled by the control unit 50.
Furthermore, the oxygen concentration in the primary air blown from the primary air passage 110 to the inside of the housing 11 may be adjusted by, for example, introducing a part of the combustion gas discharged from the boiler 200 by a gas recirculation fan (not shown) into the hot gas supplied from the hot gas passage 30a and mixing it. By adjusting the oxygen concentration in the primary air, for example, when a solid fuel with high ignition properties (easy to ignite) is used, the ignition of the solid fuel in the path from the mill 10 to the burner 220 can be suppressed.

The data measured or detected by the state detection unit 40 of the mill 10 is transmitted to the control unit 50 .
The state detection unit 40 is, for example, a differential pressure measuring means, and measures the pressure difference between the pressure at the portion where the primary air flows into the inside of the housing 11 from the primary air flow passage 110 and the pressure at the outlet port 19 where the primary air and the pulverized fuel are discharged from the inside of the housing 11 to the pulverized fuel supply pipe 120 as the differential pressure of the mill 10. The increase or decrease in the differential pressure of the mill 10 corresponds to the increase or decrease in the circulation amount of the pulverized fuel circulating between the vicinity of the rotary classifier 16 inside the housing 11 and the vicinity of the grinding table 12 due to the classification effect of the rotary classifier 16. That is, by adjusting the rotation speed of the rotary classifier 16 according to the differential pressure of the mill 10, the amount and particle size range of the pulverized fuel discharged from the outlet port 19 can be adjusted, so that the particle size of the pulverized fuel can be maintained within a range that does not affect the combustibility of the solid fuel in the burner 220, and the pulverized fuel in an amount corresponding to the supply amount of the solid fuel to the mill 10 can be stably supplied to the burner 220 provided in the boiler 200.
The state detection unit 40 is, for example, a temperature measuring means, which detects the temperature of the primary air supplied to the inside of the housing 11 (mill inlet primary air temperature) and the temperature of the mixed gas of the primary air and the pulverized fuel at the outlet port 19 (mill outlet primary air temperature), and controls the blower unit 30 so that the respective upper limit temperatures are not exceeded. Each upper limit temperature is determined in consideration of the possibility of ignition according to the properties of the solid fuel. Note that, since the primary air is cooled inside the housing 11 by transporting the pulverized fuel while drying it, the primary air temperature at the mill inlet is, for example, about room temperature to about 300°C, and the primary air temperature at the mill outlet is, for example, about room temperature to about 90°C.

The control unit 50 is a device that controls each part of the solid fuel pulverization device 100 .
The control unit 50 may, for example, transmit a drive command to the mill motor 15 to control the rotation speed of the grinding table 12 .
The control unit 50, for example, transmits a drive command to the classifier motor 18 to control the rotational speed of the rotary classifier 16 to adjust the classification performance, and can stably supply an amount of pulverized fuel corresponding to the amount of solid fuel supplied to the mill 10 to the burner 220 while maintaining the particle size of the pulverized fuel within a range that does not affect the combustibility of the solid fuel in the burner 220.
In addition, the control unit 50 can adjust the amount of solid fuel supplied (amount of coal supplied) to the mill 10 by, for example, transmitting a drive command to the coal feeder motor 27 .
Moreover, the control unit 50 can adjust the flow rate and temperature of the primary air by controlling the opening of the hot gas damper 30c and the cold gas damper 30d by transmitting an opening command to the blower unit 30. Specifically, the control unit 50 controls the opening of the hot gas damper 30c and the cold gas damper 30d so that the flow rate of the primary air supplied to the inside of the housing 11 and the temperature of the primary air at the outlet port 19 (mill outlet primary air temperature) become predetermined values set corresponding to the coal feed amount for each type of solid fuel. The temperature of the primary air may be controlled with respect to the temperature at the mill inlet (mill inlet primary air temperature).

The control unit 50 is composed of, 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 in the form of a program, for example, and the CPU reads this program into the RAM and executes information processing and arithmetic processing to realize various functions. The program may be pre-installed in a ROM or other storage medium, provided in a state stored in a computer-readable storage medium, or distributed via wired or wireless communication means. Examples of computer-readable storage media include magnetic disks, magneto-optical disks, CD-ROMs, DVD-ROMs, and semiconductor memories. The HDD may also be replaced with a solid-state disk (SSD), etc.

Next, we will explain the boiler 200 that generates steam by burning pulverized fuel supplied from the solid fuel pulverizer 100. The boiler 200 is equipped with a furnace 210 and a burner 220.

The burner 220 is a device that burns pulverized fuel to form a flame using a mixture of pulverized fuel and primary air supplied from the pulverized fuel supply pipe 120, and secondary air supplied by heating the air (outside air) sent out from the forced draft fan (FDF: Forced Draft Fan) 32 in an air preheater 34. The pulverized fuel is burned in the furnace 210, and the high-temperature combustion gas is exhausted to the outside of the boiler 200 after passing through heat exchangers (not shown) such as an evaporator, superheater, and economizer.

The combustion gas discharged from the boiler 200 undergoes predetermined treatment in an environmental device (such as a denitration device, dust collector, and desulfurization device, not shown), and is then heat-exchanged with primary air and secondary air in an air preheater 34, and is then guided to a chimney (not shown) via an induced draft fan (IDF) 33 and released into the outside air. The air heated by the combustion gas in the air preheater 34 and discharged from the primary air fan 31 is supplied to the above-mentioned hot gas flow path 30a.
The water supplied to each heat exchanger of boiler 200 is heated in a coal economizer (not shown), and then further heated by an evaporator (not shown) and a superheater (not shown) to generate high-temperature, high-pressure superheated steam. This is then sent to the steam turbine (not shown), which is the power generation section, to rotate the steam turbine, which in turn rotates a generator (not shown) connected to the steam turbine to generate electricity, thereby constituting power generation plant 1.

[About the deflection structure]
As shown in FIG. 2, the mill 10 includes a flow deflection structure 60 .
The drift structure 60 is a structure for drifting the direction of the flow of primary air blown up from around the grinding table 12 toward the axis X extending in the vertical direction of the mill 10 .

The deflection structure 60 is provided on the peripheral wall between an opening 11a formed in the peripheral wall of the housing 11 and another opening 11a adjacent thereto.
In the present embodiment, the mill 10 is provided with three grinding rollers 13, and therefore the number of openings 11a is also three. Therefore, the number of flow deflection structures 60 is also three, and the three flow deflection structures 60 are disposed at equal intervals in the circumferential direction.

As shown in FIG. 3, the deflection structure 60 includes a plurality of deflection members 70, a plurality of retaining members 80, a plurality of stopper members 91, and a plurality of bolts 92 (screw members) (see, for example, FIG. 6 and FIG. 8 for the bolts 92).

<Flow Drift Member 70>
The flow deflection member 70 is a block-shaped one-piece member, and is made of a material having excellent abrasion resistance and impact resistance.
An example of the material is high chromium cast iron.
The flow deflection member 70 is manufactured by, for example, casting.

As shown in Figures 3 and 4, the drift member 70 is supported by being hung on a hook portion 93 provided on the inner wall of the housing 11.

The hooked portion 93 extends in the circumferential direction along the inner wall of the housing 11 and protrudes in the radial direction from the inner wall of the housing 11, and has a return portion 93a at its tip. The return portion 93a protrudes upward and is configured to mesh with the hook portion 76 formed on the drift member 70.
The hook portion 93 is joined to the inner wall of the housing 11 by, for example, welding.
The hooked portion 93 may be provided for each drift member 70 .

The plurality of drift members 70 are arranged in the circumferential direction along the inner wall of the housing 11 .
In this embodiment, the flow drift members 70 are classified into three types, a flow drift member 70A, a flow drift member 70B, and a flow drift member 70C, which have different shapes.
In the following description, when it is necessary to distinguish between the various components, the reference numerals 70A, 70B, and 70C are used.

Flow drift member 70B and flow drift member 70C are the flow drift members 70 arranged at both ends in the circumferential direction among the multiple flow drift members 70. In the case of Fig. 3, the flow drift member 70 at the right end is flow drift member 70B, and the flow drift member 70 at the left end is flow drift member 70C.
The flow drift member 70A is a flow drift member 70 disposed between the flow drift member 70B and the flow drift member 70C. In the case of Fig. 3, two flow drift members 70A are disposed between the flow drift member 70B and the flow drift member 70C.

<<Flow Drift Member 70A>>
As shown in FIG. 5, the flow drift member 70A is a block-shaped member having a lower inclined surface 71 (first inclined surface), an upper inclined surface 72 (second inclined surface), an inner wall contact surface 73, and an upper surface 74.

The downward inclined surface 71 is a surface located at the lower part of the flow deflection member 70A, and extends obliquely upward toward the center of the mill 10 (i.e., toward the axis X of the housing 11).
The downward inclined surface 71 is located directly above the air outlet 12b and the swirl vane 12a, and serves as a surface onto which the primary air is directly blown. The primary air blown onto the downward inclined surface 71 flows along the downward inclined surface 71 and is deflected toward the center of the mill 10.

The upper inclined surface 72 is a surface of the flow deflection member 70A that is located higher than the lower inclined surface 71 and extends obliquely downward toward the center of the mill 10 (i.e., toward the axis X of the housing 11).
The leading edge of the upper inclined surface 72 is connected to the leading edge of the lower inclined surface 71 .
The inclination angle of the upper inclined surface 72 is set to an angle equal to or greater than the angle of repose of the pulverized solid fuel, thereby preventing the pulverized solid fuel from piling up.

The upper surface 74 is a surface located at the upper portion of the flow drift member 70A and extends substantially horizontally.
The leading edge of the upper surface 74 is connected to the trailing edge of the upper inclined surface 72 .
A pressing member 80 , which will be described later, is placed on the upper surface 74 .

The inner wall contact surface 73 corresponds to the rear surface of the flow deflection member 70A, and comes into contact with the inner wall of the housing 11.
The inner wall contact surface 73 is curved in the circumferential direction so as to fit the shape of the inner wall of the housing 11 .

As shown in FIGS. 5 and 6, a recess 75 is formed in the flow deflection member 70A.
The recess 75 is a portion recessed from the inner wall contact surface 73, which corresponds to the back surface of the flow deflection member 70A, toward the inside (radially inward) of the flow deflection member 70A.

6, the recess 75 defines a space S1 inside the flow drift member 70A. The hooked portion 93 and the stopper member 91 are housed in the space S1.
It is preferable that the space S1 is provided at approximately the same position as the upper inclined surface 72 in the vertical direction, and is not provided at approximately the same position as the lower inclined surface 71. This makes it possible to ensure that the flow drift member 70A at approximately the same position as the lower inclined surface 71 has a sufficient thickness.

As shown in FIGS. 5 and 6, a hook portion 76 is formed at the entrance of a recess 75 adjacent to the inner wall of the housing 11 (the entrance of the space S1).
The hook portion 76 is a portion that protrudes downward and is configured to mesh with a return portion 93a formed on the hooked portion 93. As a result, the hook portion 76 of the flow drift member 70A is hooked onto the hooked portion 93, so that the flow drift member 70A is supported by the hooked portion 93 and the radial movement of the flow drift member 70A is regulated by the return portion 93a.

In addition, to enable the hooking portion 76 and the hooked portion 93 to begin to mesh with each other smoothly and to prevent the components from chipping, the tip of the hooking portion 76 and/or the tip of the hooked portion 93 may be chamfered with a C-shape or a R-shape.
In addition, it is preferable to provide the hook portion 76 above the center of gravity of the flow drift member 70A so that the flow drift member 70A hung on the hooked portion 93 is stable.

The flow drift member 70A has a bolt through hole 78 formed therein, which penetrates from the upper surface 74 toward the space S1.
As shown in FIG. 6, a shaft portion 92b of a bolt 92 is inserted into the bolt through-hole 78 from above.

As shown in FIGS. 5 and 6, the flow drift member 70A has a through hole 77 formed therein, which penetrates in the radial direction from the upper inclined surface 72 toward the space S1.
As shown in FIG. 6 , the stopper member 91 (more specifically, the portion other than the return portion 91 a ) is inserted into the through hole 77 .

The tip of the stopper member 91 is formed with a barbed portion 91a that protrudes upward and is configured to be caught by the flow drift member 70A without being inserted into the through hole 77. This allows the barbed portion 91a to regulate the radial movement of the flow drift member 70A. The tip surface of the barbed portion 91a is inclined so as to be substantially flush with the upper inclined surface 72 of the flow drift member 70A. This prevents the pulverized solid fuel from piling up.
A female screw portion 91b is formed at the base end of the stopper member 91, and is coupled with a male screw formed on a shaft portion 92b of a bolt 92 inserted from above.

<<Flow Drift Member 70B>>
As shown in FIG. 7, the flow drift member 70B is a block-shaped member having a lower inclined surface 71 (first inclined surface), an upper inclined surface 72 (second inclined surface), an inner wall contact surface 73 and an upper surface 74.
The flow drift member 70B has the same basic configuration as the flow drift member 70A, so the following description will mainly focus on the differences from the flow drift member 70A.

As shown in FIG. 8, the recess 75 forms a space S1 inside the drift member 70B. The hooked portion 93 is housed in the space S1.

As shown in Figures 3, 4 and 7, the side (right side) of the deflection member 70B is cut so as not to interfere with the crushing roller 13 installed in the opening 11a. In other words, when the deflection structure 60 is viewed in a plan view, the tip of the deflection member 70B is sharper than the tip of the deflection member 70A. Therefore, due to space constraints, as shown in Figure 7 compared to Figure 5, the deflection member 70B does not have a through hole 77 for inserting the stopper member 91.

<<Flow Drift Member 70C>>
As shown in FIG. 3, the flow drift member 70C is a block-shaped member that is symmetrical to the flow drift member 70B.

<Pressing member>
As shown in FIGS. 4 and 6, the pressing member 80 is a block-shaped one-piece member.
The pressing members 80 correspond, for example, to the drift members 70 in a one-to-one relationship.
Since the pressing member 80 is not a member against which the primary air is directly blown, the pressing member 80 is not required to have the same abrasion resistance and impact resistance as the flow drift member 70. In addition, in consideration of the workability of the bolt insertion holes 85, which will be described later, it is preferable that the material of the pressing member 80 is softer than the material of the flow drift member 70.
An example of the material is mild steel.
The pressing member 80 is manufactured by, for example, casting.

The pressing member 80 has an upper inclined surface 82 (second inclined surface), an inner wall contact surface 83, and a lower surface 84.

The upwardly inclined surface 82 is a surface that extends obliquely downward toward the center of the mill 10 (i.e., toward the axis X of the housing 11).
The inclination angle of the upper inclined surface 82, like the upper inclined surface 72 of the drift member 70, is set to an angle equal to or greater than the angle of repose of the pulverized solid fuel.
The upper inclined surface 82 is configured to smoothly connect with the upper inclined surface 72 of the flow deflection member 70 when the pressing member 80 is placed on the upper surface 74 of the flow deflection member 70 .

The lower surface 84 is a surface located at the lower part of the pressing member 80 and extends substantially horizontally.
The leading edge of the lower surface 84 is connected to the leading edge of the upper inclined surface 82 .
The lower surface 84 comes into surface contact with the upper surface 74 of the flow deflection member 70 when the pressing member 80 is placed on the upper surface 74 of the flow deflection member 70 .

The inner wall contact surface 83 corresponds to the rear surface of the pressing member 80 and comes into contact with the inner wall of the housing 11 .
The inner wall contact surface 83 , like the inner wall contact surface 73 of the flow deviation member 70 , is curved in the circumferential direction so as to fit the shape of the inner wall of the housing 11 .

As shown in Figures 3 and 4, the sides of the pressing member 80 corresponding to the flow deflection members 70B and 70C are cut so as not to interfere with the crushing roller 13.

As shown in FIGS. 6 and 8, the pressing member 80 is formed with a bolt insertion hole 85 penetrating downward from the upper inclined surface 82.
The bolt insertion holes 85 are formed, for example, by drilling the cast pressing member 80 .
A bolt 92 is inserted into the bolt insertion hole 85 from above.
The bolt insertion hole 85 is a stepped hole, and is configured so that the shaft portion 92 b of the bolt 92 protrudes from the lower surface 84 and the head portion 92 a of the bolt 92 is caught on the stepped portion of the bolt insertion hole 85 .

<Fixing of drift member 70>
As shown in Figures 6 and 8, when the pressure member 80 is placed on the flow deflection member 70, the tip of the shaft portion 92b of the bolt 92 protruding from the lower surface 84 of the pressure member 80 passes through the bolt through-hole 78 formed in the flow deflection member 70 and reaches the space S1 inside the flow deflection member 70.

As shown in FIG. 6, for the drift member 70A provided with the stopper member 91, the tip of the shaft portion 92b of the bolt 92 passes through the bolt insertion hole 93b formed in the hook portion 93, reaches the stopper member 91, and engages with the female thread portion 91b of the stopper member 91.

On the other hand, as shown in FIG. 8, for the flow deflection members 70B and 70C, which do not have a stopper member 91, the tip of the shaft portion 92b of the bolt 92 reaches the hook portion 93 and engages with the female thread portion 93c formed on the hook portion 93.

In either case, the pressure member 80 and the bolt 92 fix the hook portion 76 of the flow drift member 70 in a state where it is pressed against the hooked portion 93, and where the hook portion 76 of the flow drift member 70 is securely engaged with the return portion 93a of the hooked portion 93.
Therefore, the drift member 70 is firmly fixed to the hooked portion 93 .

In addition, adjacent deflection members 70 may be fastened together with bolts or the like to form an integrated unit of the deflection members 70.

<Modification 1 of Flow Drift Member>
The flow drift members 70B and 70C do not necessarily need to be hooked on the hooked portions 93, and may be configured to be hooked on the adjacent flow drift member 70A, for example.

<Modification 2 of drift member>
The size of each drift member 70 and each presser member 80 is designed taking into consideration the size of the manhole of the mill 10, the size of the opening 11a of the housing 11, the weight that can be handled, etc. In other words, the number of divisions in the circumferential direction of the drift structure 60 is designed taking into consideration the size of the manhole, the size and weight of the opening 11a, etc. In other words, as a result of taking into consideration the size of the manhole, the size and weight of the opening 11a, etc., there may be cases where the drift structure 60 is not divided.
Also, one pressing member 80 may be used for a plurality of drift members 70 .

<Modification 3 of drift member>
The flow deflection member 70 may be cast by incorporating ceramic particles into high chromium cast iron (cast-in insert).
9, the density of ceramic particles in the portion of the flow deflection member 70 including the downward inclined surface 71 may be made higher than that in other portions of the flow deflection member 70. This makes the portion of the flow deflection member 70 including the downward inclined surface 71 a material with higher abrasion resistance than the other portions of the flow deflection member 70.

<Modification 4 of drift member>
An adhesive, sealant, or anti-wear putty may be applied to the joints between adjacent flow deflection members 70 and to the joints between the flow deflection members 70 and the inner wall of the housing 11 .

<Modification 1 of Hook Part>
10, a plurality of hooking portions 76 (and a plurality of corresponding hooked portions 93) may be provided along the vertical direction. This allows the weight of the drift member 70 to be distributed to each of the hooking portions 76.

[Method of assembling the crusher]
As shown in FIG. 11 , the drift member 70 , which is a heavy object, is suspended by a suspension device such as a jib crane 300 installed inside the housing 11 and handled inside the housing 11 .
Then, by operating the jib crane 300 and controlling the position and attitude of the drift member 70, the drift member 70 is moved and the hooking portion 76 of the drift member 70 is hooked onto the hooked portion 93, whereby the drift member 70 is installed in the housing 11.

The drift member 70 is suspended by using a sling 301, for example.
As shown in FIG. 12, for the flow drift member 70A, a sling 301 may be passed through the through hole 77 and the bolt through hole 78, so that a sling 301 is hung on the flow drift member 70A.
13, for the flow drift members 70B and 70C, a hanging piece such as an eye bolt 302 may be provided on the upper surface 74, and the sling 301 may be hung on the flow drift member 70A by passing the sling 301 through the eye bolt 302. Also, instead of the hanging piece, a hanging hole may be formed in the flow drift members 70B and 70C.

A lifting device such as the jib crane 300 may also be used when replacing the drift member 70 during maintenance.
During maintenance, it is not necessary to replace all of the flow drift members 70, and only those flow drift members 70 that are severely worn or damaged may be replaced.

According to this embodiment, the following effects are obtained.
The air conditioner is provided with a block-shaped deflection member 70 having a downward inclined surface 71 onto which the primary air is blown, and therefore the primary air blown onto the downward inclined surface 71 can be deflected.
Furthermore, one surface of the block-shaped drift member 70 serves as the downward inclined surface 71 (the surface onto which the primary air is blown), which eliminates the need to separately prepare numerous plate-shaped liners, bolts for fixing each liner, and covers for protecting the bolts, and also saves the effort required for installing them.
Conventionally, for example, to prevent bolt wear, it was necessary to install a cover with excellent wear and impact resistance on the head of the bolt, install covers on the other bolts to which the cover was attached, and then apply wear-resistant putty on top of that. Also, since the surface of the deflector plate to which the liner is attached faces downward, it was necessary to lift the liner and fix it facing upward, which was not easy to do.

In addition, the deflection member 70 with the downwardly inclined surface 71 has a hook portion 76 that hooks onto the hook portion 93 on the inner wall of the housing 11, so that the deflection member 70 can be easily supported in a predetermined position simply by hanging the deflection member 70 directly on the hook portion 93.

In addition, by providing the downward inclined surface 71 and the hook portion 76 on the block-shaped deflection member 70, for example, the distance from the hook portion 76 or the inner wall to the first inclined surface, i.e., the thickness of the deflection member 70, can be sufficiently ensured. This makes it possible to reduce the frequency of maintenance of the deflection member 70 due to wear.

In addition, because the deflection member 70 is block-shaped, it is possible to remove material within a range that ensures sufficient thickness, making the deflection member 70 lighter.

In addition, the block-shaped pressing member 80 is installed on the upper surface 74 of the flow deflection member 70 and has an upwardly inclined surface 82, thereby reducing the possibility of the pulverized solid fuel accumulating on the flow deflection structure 60.
In addition, since the primary air is not blown directly onto the upper inclined surface 82, for example, by manufacturing the pressure member 80 from a cheaper material than the flow deflection member 70 (for example, a material that is less abrasion-resistant and impact-resistant than the flow deflection member 70), costs can be reduced without compromising the function of preventing accumulation.

In addition, the deflection member 70 is fixed in a state where it is pressed against the hooked portion 93 by the pressing member 80 and the bolt 92, so that the deflection member 70 can be easily and firmly fixed to the hooked portion 93.

In addition, the deflection member 70 has a through hole 77 that penetrates the housing 11 in the radial direction, so that the through hole 77 can be used to suspend the deflection member 70 with a sling 301 or the like.

In addition, the through hole 77 used for hanging can be blocked by inserting the stopper member 91 into the through hole 77 in the radial direction.

In addition, the stopper member 91 has a return portion 91a, which prevents the drift member 70 from coming loose in the radial direction.

Furthermore, when the bolt 92 that passes through the hooked portion 93 is connected to the stopper member 91, i.e., when the female thread portion 91b is formed in the stopper member 91 rather than the hooked portion 93, there is no need to form the female thread portion 93c in the hooked portion 93.
Therefore, even if the female screw portion 91b is damaged, the damage can be easily dealt with by simply replacing the stopper member 91, for example.

Furthermore, when the bolt 92 is connected to the hook portion 93, i.e., when the female thread portion 93c is formed on the hook portion 93, the drift member 70 can be fixed with a simple structure.

Furthermore, by varying the density of the ceramic particles contained within the deflection member 70 from part to part, the lower inclined surface 71 of the deflection member 70 can be made of a material that is more abrasion resistant than the other parts of the deflection member 70, which can further reduce the frequency of maintenance of the deflection member 70 due to wear.

In addition, since at least two or more flow drift members 70 are arranged adjacent to each other in the circumferential direction of the housing 11, the size and weight of each flow drift member 70 can be reduced. This makes it easier for an operator to handle the flow drift members 70.
Moreover, maintenance can be performed by replacing only the flow drift members 70 that are most worn out among the multiple flow drift members 70 .

The solid fuel used is not limited to that disclosed herein, and coal, biomass fuel, petroleum coke (PC), etc. may be used. Furthermore, these solid fuels may be used in combination.

The flow deflection structure, the crusher, and the method of assembling the crusher according to the present embodiment described above can be understood, for example, as follows.
That is, the flow deflection structure (60) according to the first aspect of the present disclosure is a flow deflection structure (60) that deflects the conveying gas blown up from below inside the housing (11) of the crusher (10), and is provided with a block-shaped flow deflection member (70). The flow deflection member (70) has a first inclined surface (71) that extends obliquely upward toward a central axis extending in the vertical direction of the housing (11) and toward which the conveying gas is blown, and a hook portion (76) that hooks onto a hook portion (93) provided on the inner wall of the housing (11).

According to the flow deflection structure (60) of this embodiment, a block-shaped flow deflection member (70) is provided, and the flow deflection member (70) has a first inclined surface (71) onto which the carrier gas is blown, so that the carrier gas blown onto the first inclined surface (71) can be deflected. Moreover, one surface of the block-shaped flow deflection member (70) is directly used as the first inclined surface (71) (the surface onto which the carrier gas is blown), so that it is not necessary to separately prepare a large number of plate-shaped liners, fasteners for fixing the liners, and covers for protecting the fasteners, and it is possible to save the effort of attaching them.
In addition, the flow deflection member (70) having the first inclined surface (71) has a hook portion (76) that hooks onto the hook portion (93) of the inner wall of the housing (11), so that the flow deflection member (70) can be easily supported at a predetermined position simply by directly hanging the flow deflection member (70) on the hook portion (93).
Furthermore, by providing the first inclined surface (71) and the hook portion (76) on the block-shaped flow deflection member (70), for example, the first inclined surface (71) can be disposed so as to be spaced away from the hook portion (76) and the inner wall, thereby making it possible to sufficiently secure the distance from the hook portion (76) and the inner wall to the first inclined surface (71), i.e., the thickness of the flow deflection member (70). Therefore, the frequency of maintenance of the flow deflection member (70) due to wear can be reduced.
In addition, since the flow drift member (70) is block-shaped, it is possible to reduce the weight of the flow drift member (70) by removing material therefrom within a range that ensures a sufficient wall thickness.

The deflection structure (60) according to the second aspect of the present disclosure, in the first aspect, is provided with a block-shaped pressing member (80), which is disposed on the upper surface (74) of the deflection member (70) and has a second inclined surface (82) that extends obliquely downward toward the central axis of the housing (11).

According to the present embodiment of the deflection structure (60), the block-shaped pressure member (80) is installed on the upper surface (74) of the deflection member (70) and has a second inclined surface (82), thereby reducing the possibility of pulverized solid fuel accumulating on the deflection structure (60).
In addition, since the carrier gas is not directly sprayed onto the second inclined surface (82), costs can be reduced without compromising the function of preventing deposition, for example, by manufacturing the pressing member (80) from a cheaper material than the flow deflection member (70) (for example, a material that is less abrasion-resistant and impact-resistant than the flow deflection member (70)).

In addition, the deflection structure (60) according to the third aspect of the present disclosure, in the second aspect, includes a screw member (92) that is inserted downward from the second inclined surface (82) of the pressing member (80), and the deflection member (70) is fixed in a state where it is pressed against the hook portion (93) by the pressing member (80) and the screw member (92).

In the present embodiment of the deflection structure (60), the deflection member (70) is fixed in a state where it is pressed against the hooked portion (93) by the pressing member (80) and the screw member (92), so that the deflection member (70) can be easily and firmly fixed to the hooked portion (93).

The deflection structure (60) according to the fourth aspect of the present disclosure is also provided with a stopper member (91) in the third aspect, and the deflection member (70) has a through hole (77) penetrating the housing (11) in the radial direction, and the stopper member (91) is inserted into the through hole (77) along the radial direction and has a stopper (91a) that restricts the radial movement of the deflection member (70), and the screw member (92) penetrating the hook portion (93) is connected to the stopper member (91).

According to the present embodiment of the flow deflection structure (60), the flow deflection member (70) has a through hole (77) that penetrates the housing (11) in the radial direction, so that the through hole (77) can be used to suspend the flow deflection member (70) with a sling or the like.
Furthermore, since the stopper member (91) is inserted into the through hole (77) along the radial direction, it is possible to close the through hole (77) used for suspension.
In addition, since the stopper member (91) has the stopper (91a), it is possible to prevent the drift member (70) from coming off in the radial direction.
In addition, since the screw member (92) that penetrates the hooked portion (93) is connected to the stopper member (91), i.e., the female thread is formed in the stopper member (91) rather than in the hooked portion (93), there is no need to form a female thread in the hooked portion (93). Therefore, even if the female thread is damaged, it can be easily dealt with by simply replacing the stopper member (91), for example.

In addition, in the third aspect of the deflection structure (60) according to the fifth aspect of the present disclosure, the screw member (92) is connected to the hook portion (93).

In this embodiment of the deflection structure (60), the screw member (92) is connected to the hook portion (93), i.e., the hook portion (93) is formed with a female thread, so that the deflection member (70) can be fixed with a simple structure.

Furthermore, in the sixth aspect of the present disclosure, the deflection structure (60) is any one of the first to fifth aspects, in which the deflection member (70) has a plurality of the hook portions (76) along the vertical direction.

According to this embodiment of the deflection structure (60), the deflection member (70) has multiple hooks (76) along the vertical direction, so that the weight of the deflection member (70) can be distributed to each hook (76).

Furthermore, in the seventh aspect of the present disclosure, the deflection structure (60) is any one of the first to sixth aspects, in which the first inclined surface (71) of the deflection member (70) is formed from a material that is more abrasion resistant than the other parts of the deflection member (70).

According to this embodiment of the deflection structure (60), the first inclined surface (71) of the deflection member (70) is formed from a material that is more abrasion resistant than the other parts of the deflection member (70), which further reduces the frequency of maintenance of the deflection member (70) due to wear.

The eighth aspect of the present disclosure relates to a deflection structure (60) in any one of the first to seventh aspects, in which the number of deflection members (70) is at least two, and the deflection members (70) are arranged adjacent to each other in the circumferential direction of the housing (11).

According to the deflection structure (60) of this embodiment, at least two or more deflection members (70) are arranged adjacent to each other in the circumferential direction of the housing (11), so the size and weight of each deflection member (70) can be reduced. This makes it easier for workers to handle the deflection members (70). In addition, maintenance can be performed by replacing only the deflection members (70) that are most worn out among the multiple deflection members (70).

The deflection structure (60) according to the ninth aspect of the present disclosure is provided between an opening (11a) formed in the peripheral wall of the housing (11) and another opening (11a) adjacent thereto in any of the first to eighth aspects.

The crusher (10) according to the tenth aspect of the present disclosure includes the deflection structure (60) according to any one of the first to ninth aspects, and the housing (11) having the hook portion (93).

The method of assembling the pulverizer (10) according to the eleventh aspect of the present disclosure is the method of assembling the pulverizer (10) according to the tenth aspect, in which the flow deflection member (70) is suspended and moved, and the hook portion (76) of the flow deflection member (70) is hooked onto the hooked portion (93) of the housing (11).

1 Power plant 10 Mill (crusher)
11 Housing 11a Opening 12 Crushing table 12a Swirling blade 12b Conveying gas outlet 13 Crushing roller 14 Reducer (drive transmission unit)
15 Mill motor (drive unit)
16 Rotary classifier (classification section)
16a Blade 17 Coal supply pipe (fuel supply section)
18 Classifier motor 19 Outlet port 21 Bunker (storage section)
22 Downspout portion 25 Coal feeder (fuel feeder)
26 Conveying section 27 Coal feeder motor 30 Blower section (conveying gas supply section)
30a: hot gas flow path 30b: cold gas flow path 30c: hot gas damper 30d: cold gas damper 31: primary air ventilator (PAF)
32 Forced draft fan (FDF)
33 Induced Draft Fan (IDF)
34 Air preheater (heat exchanger)
40 Status detection unit (temperature detection means, differential pressure detection means)
41 Bottom surface portion 42 Ceiling portion 45 Journal head 46 Pressing device (crushing load applying portion)
47 Support arm 48 Support shaft 50 Control unit 60 Flow deflection structure 70 (70A, 70B, 70C) Flow deflection member 71 Downward inclined surface (first inclined surface)
72 upward inclined surface (second inclined surface)
73 Inner wall contact surface 74 Upper surface 75 Recess 76 Hook portion 77 Through hole 78 Bolt through hole 80 Pressing member 82 Upper inclined surface (second inclined surface)
83 Inner wall contact surface 84 Lower surface 85 Bolt insertion hole 91 Stopper member 91a Return portion (stopper)
91b Female thread portion 92 Bolt (screw member)
92a Head 92b Shaft 93 Hooked portion 93a Return portion 93b Bolt insertion hole 93c Female thread 100 Solid fuel pulverizer 110 Primary air flow path (transport gas flow path)
120 pulverized fuel supply passage (pulverized fuel supply pipe)
200 boiler 210 furnace 220 burner (combustion device)
300 Jib crane 301 Sling 302 Eye bolt

Claims (11)

1. A flow deflection structure for deflecting a conveying gas blown up from below inside a housing of a crusher,
   A block-shaped deflection member is provided,
   The drift member is
   a first inclined surface extending obliquely upward toward a central axis extending in a vertical direction of the housing and onto which the carrier gas is blown;
   a hook portion that is hooked onto a hooked portion of an inner wall of the housing;
   The deflection structure has a
2. A block-shaped pressing member is provided,
   The pressing member is
   A flow deflection member is provided on an upper surface of the flow deflection member.
   2. The flow deflection structure of claim 1, further comprising a second inclined surface extending diagonally downwardly toward said central axis of said housing.
3. a screw member that is inserted downward from the second inclined surface of the pressing member,
   3. The flow deflection structure according to claim 2, wherein the flow deflection member is fixed in a state where it is pressed against the hooked portion by the pressing member and the screw member.
4. A stopper member is provided,
   The flow deflection member has a through hole passing through the housing in a radial direction,
   the stopper member is inserted into the through hole along the radial direction and has a stopper that restricts movement of the drift member in the radial direction,
   4. The flow deflection structure according to claim 3, wherein the screw member passing through the hook portion is coupled to the stopper member.
5. 4. The flow deflection structure according to claim 3, wherein the screw member is coupled to the hook portion.
6. 2. The flow deflection structure according to claim 1, wherein the flow deflection member has a plurality of the hook portions along the up-down direction.
7. 2. The flow deflection structure according to claim 1, wherein the first inclined surface of the flow deflection member is formed of a material having superior abrasion resistance to other portions of the flow deflection member.
8. The number of the drift members is at least two,
   2. The flow deflection structure according to claim 1, wherein the flow deflection members are arranged adjacent to each other in the circumferential direction of the housing.
9. 2. The flow deflection structure according to claim 1, which is provided between an opening formed in the peripheral wall of the housing and another opening adjacent thereto.
10. A flow deflection structure according to any one of claims 1 to 9,
    The housing having the hook portion;
    A crusher equipped with:
11. A method for assembling a pulverizer according to claim 10, comprising the steps of:
    A method for assembling a crusher, comprising the steps of suspending and moving the flow drift member and hooking the hooking portion of the flow drift member onto the hooked portion of the housing.

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