Roller journal protector and removal method

Abstract

To provide roller journal protectors and a removing method that allow the roller journal protectors to be removed without drawing out each pulverization roller unit from a housing.SOLUTION: Roller journal protectors 401, 402 are attached to a pulverization roller unit which is provided between a peripheral wall and a pulverization table, and in which an air outlet for blowing out transporting gas upward is disposed below a shaft part. The roller journal protectors include: an attachment panel part which is attached to a journal head 43; and a shield part which is formed in a half-frustum shape enclosing a lower part of a journal shaft 310 in a circumferential direction relative to a shaft line X, and in which a base end part is fixed to the attachment panel part, and a tip extends toward a roller part, and which covers a portion of the journal shaft 310 where the transporting gas blown out through the air outlet hits. The roller journal protectors 401, 402 are splittable in the circumferential direction.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present disclosure relates to roller journal protectors and removal methods. [Background technology]

[0002] Inside a crusher (vertical mill), the crushed material is blown upward by the carrier gas supplied upward from the periphery of the crushing table. Some of the crushed material blown upward by the flow of the carrier gas collides with the journal shaft of the crushing roller located above the periphery of the crushing table. Collision of the crushed material with the journal shaft causes wear on the journal shaft, so to avoid this, a roller journal protector is sometimes provided on the journal head (Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-113701 Summary of the Invention [Problem to be solved by the invention]

[0004] However, even roller journal protectors that are intended to protect the journal shafts may wear out over long periods of use, and require periodic replacement or repair. However, the roller journal protector is installed in the narrow space (narrow section) between the grinding table and the bottom of the journal shaft, and is also covered on the left and right sides by a frame material. Therefore, to replace or repair it, the entire grinding roller unit must be pulled out of the mill housing and then the roller journal protector must be removed, which is time-consuming and costly.

[0005] The present disclosure has been made in consideration of these circumstances, and aims to provide a roller journal protector and a method for removing the same that allow the roller journal protector to be removed without having to pull the entire crushing roller unit out of the housing. [Means for solving the problem]

[0006] In order to solve the above problems, the roller journal protector and removal method of the present disclosure employ the following measures. That is, a roller journal protector according to one aspect of the present disclosure comprises: a journal head disposed in an opening formed in a peripheral wall of a housing of a crusher; a shaft portion having an axis extending toward a crushing table of the crusher and supported by the journal head; and a crushing roller having a roller portion rotatably attached to the shaft portion around the axis and crushing solid fuel on the crushing table, wherein an outlet provided between the peripheral wall and the crushing table and through which a carrier gas is blown upward is attached to a crushing roller unit disposed below the shaft portion, and the roller journal protector comprises: a mounting panel portion attached to the journal head; and a shield portion formed in a semi-frustum shape surrounding the lower part of the shaft portion in the circumferential direction about the axis, with a base end fixed to the mounting panel portion and a tip end extending toward the roller portion and covering the portion of the shaft portion that is hit by the carrier gas blown out from the outlet, and is separable in the circumferential direction.

[0007] A removal method according to one aspect of the present disclosure is a method for removing a crushing roller unit comprising: a journal head disposed in an opening formed in a peripheral wall of a housing of a crusher; a shaft portion supported by the journal head and having an axis extending toward a crushing table of the crusher; a crushing roller having a roller portion rotatably attached to the shaft portion about the axis for crushing solid fuel on the crushing table; and a roller journal protector, wherein an outlet provided between the peripheral wall and the crushing table and through which a carrier gas is blown upward is disposed below the shaft portion, The roller journal protector has a mounting panel portion that is attached to the journal head, and a shield portion that is formed in a semi-conical shape that surrounds the lower part of the shaft portion in a circumferential direction relative to the axis, with its base end fixed to the mounting panel portion and its tip end extending toward the roller portion, and that covers the part of the shaft portion that is hit by the carrier gas blown out from the outlet, and is capable of being divided in the circumferential direction, and the method includes a dividing step for dividing the roller journal protector, and a moving step for moving each of the divided roller journal protectors to the top of the shaft portion so that they align with the outer peripheral surface of the shaft portion. [Effects of the Invention]

[0008] According to the present disclosure, the roller journal protector can be removed without pulling the entire crushing roller unit out of the housing. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a schematic configuration diagram of a power plant according to an embodiment of the present disclosure. [Figure 2] FIG. 2 is a perspective view of the vicinity of a crushing roller unit according to an embodiment of the present disclosure. [Figure 3] FIG. 2 is a cross-sectional view of a crushing roller unit according to an embodiment of the present disclosure. [Figure 4] FIG. 2 is a perspective view of a roller journal protector according to an embodiment of the present disclosure. [Figure 5]FIG. 1 is a perspective view (front) of a roller journal protector according to one embodiment of the present disclosure. [Figure 6] FIG. 2 is a perspective view (rear view) of a roller journal protector according to one embodiment of the present disclosure. [Figure 7] FIG. 10 is a perspective view (front) showing the state when removed. [Figure 8] FIG. 10 is a plan view showing the state of the connecting step; [Figure 9] FIG. 10 is a perspective view (front view) of a roller journal protector according to a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0010] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A roller journal protector and a removal method according to an embodiment of the present disclosure will now be described with reference to the drawings. The mill (pulverizer) 10 of this embodiment is, for example, a vertical mill provided in a power generation plant 1 that uses pulverized fuel obtained by pulverizing solid fuel. The raw material to be pulverized by the mill 10 is not limited to solid fuel, but may be, for example, ore, etc. In other words, the mill 10 may be a pulverizer that pulverizes raw materials such as ore.

[0011] [Outline of the power plant] 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.

[0012] The solid fuel pulverizer 100 of this embodiment is an apparatus that pulverizes solid fuel, such as biomass fuel or coal, to generate pulverized fuel and supply it to a burner (combustion device) 220 of a boiler 200, for example. 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.

[0013] The solid fuel pulverizing device 100 of this embodiment comprises a mill (pulverizer) 10, a bunker (storage section) 21, a coal feeder (fuel supplier) 25, a blower (carrier gas supplier) 30, a status detection section 40, and a control section 50.

[0014] The mill 10, which pulverizes solid fuel such as coal or biomass fuel to be supplied to the boiler 200 into finely divided fuel, which is a finely divided solid fuel, may be of a type that pulverizes only coal, or 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 fuel refers to 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 is not limited to the ones listed here.Biomass fuels are carbon neutral, meaning they do not emit carbon dioxide, a greenhouse gas, because they absorb carbon dioxide during the biomass growth process, and various uses for them are being considered.

[0015] The mill 10 includes a housing 11, a grinding table 12, a grinding roller unit 300, 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 formed in a cylindrical shape extending in the vertical direction, and is a case that accommodates the crushing table 12, the crushing roller unit 300, the rotary classifier 16, and the coal feed pipe 17. 2, an opening 11a is formed in the peripheral wall of the housing 11, and the crushing roller unit 300 is disposed therein. On both sides of the opening 11a, frame members 11b are provided extending in the vertical direction.

[0016] 1, a coal feed pipe 17 is attached to the center of the ceiling portion 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. The coal feed pipe 17 is disposed vertically at the center of the housing 11, and its lower end portion extends into the interior of the housing 11.

[0017] A reducer 14 is installed near the bottom surface 41 of the housing 11, and a mill motor 15 connected to the reducer 14 transmits a driving force to rotate the grinding table 12, which is rotatably arranged. The grinding table 12 is a circular member in a plan view, and is arranged so that the lower end of the coal feed pipe 17 faces it. The upper surface of the grinding table 12 may, for example, have an inclined shape that is low in the center and rises toward the outside, with the outer periphery curved upward. The coal feed 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 itself and the roller portion 320 (see FIG. 3) of the grinding roller unit 300 to grind it.

[0018] When solid fuel is fed from the fuel supply unit 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 toward the outer periphery of the grinding table 12, where it is pinched and ground between the grinding table 12 and the roller unit 320. The ground solid fuel is guided through 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) 13, and is guided to the rotary classifier 16. As shown in FIG. 3 , an air outlet 13 is provided between the outer circumferential surface of the grinding table 12 and the inner circumferential surface of the housing 11, through which primary air flowing in from the primary air flow path 110 flows into the space above the grinding table 12 within the housing 11. In addition, a swirl blade 12a is provided on the outer circumferential side of the grinding table 12, located at the outlet of the air outlet 13, and applies a swirling force to the primary air blown out from the air outlet 13. The primary air given the swirling force by the swirl blade 12a becomes an airflow with a swirling velocity component, and transports the solid fuel pulverized on the grinding table 12 to the rotary classifier 16 located above in the housing 11. Note that, of 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 and are returned to the grinding table 12, where they are pulverized again between the grinding table 12 and the roller unit 320.

[0019] The roller unit 320 is a rotating body that pulverizes the solid fuel supplied onto the pulverization table 12 from the coal supply pipe 17. The roller unit 320 is pressed against the upper surface of the pulverization table 12 and cooperates with the pulverization table 12 to pulverize the solid fuel. 1 shows only one representative crushing roller unit 300, but multiple crushing roller units 300 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 roller units 300 are arranged at equal intervals in the circumferential direction on the outer periphery, spaced apart by an angle of 120°. In this case, the portions where the roller parts 320 of the three crushing roller units 300 come into contact with the upper surface of the crushing table 12 (pressing portions) are equidistant from the rotational axis of the crushing table 12.

[0020] The crushing roller unit 300 can be swung and displaced up and down by the journal head 43, and is supported so as to be able to move towards and away from the upper surface of the crushing table 12. When the crushing table 12 rotates, the roller part 320 receives a rotational force from the crushing table 12 and rotates along with the rotation of the crushing table 12, with the outer circumferential surface of the roller part 320 in contact with the solid fuel on the upper surface of the crushing table 12. When solid fuel is supplied from the coal supply pipe 17, the solid fuel is pressed and crushed between the roller portion 320 and the crushing table 12. This pressing force is called the crushing load.

[0021] The support arm 44 of the journal head 43 is supported on the side of the housing 11 by a support shaft 45 whose middle portion is horizontally aligned, allowing the crushing roller unit 300 to swing and displace up and down about the support shaft 45. A pressing device (crushing load applying unit) 46 is provided at the upper end portion vertically above the support arm 44. The pressing device 46 is fixed to the housing 11 and applies a crushing load to the crushing roller unit 300 via the support arm 44 and the like so as to press the roller portion 320 of the crushing roller unit 300 against the crushing table 12. The crushing load is applied, for example, by a hydraulic cylinder (not shown) operated by the pressure of hydraulic oil supplied from a hydraulic device (not shown) installed outside the mill 10. Alternatively, the crushing load may be applied by the repulsive force of a spring (not shown).

[0022] The reducer 14 is connected to a 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.

[0023] The rotary classifier (classification unit) 16 is provided at the top 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 its outer periphery. 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 solid fuel pulverized by the pulverizing table 12 and the pulverizing roller unit 300 (hereinafter, the pulverized solid fuel will be referred to as "pulverized fuel" or "pulverized material") into particles larger than a predetermined particle size (for example, 70 to 100 μm for coal) (hereinafter, pulverized fuel exceeding the predetermined particle size will be referred to as "coarse pulverized fuel") and particles smaller than the predetermined particle size (hereinafter, pulverized fuel smaller than the predetermined particle size will be referred to as "fine pulverized fuel"). The rotary classifier 16 is given a rotational driving force by a classifier motor 18 controlled by a control unit 50, and rotates around a cylindrical axis (not shown) extending in the vertical direction of the housing 11, around the fuel supply unit 17. The classifying section may be a fixed classifier having a fixed hollow inverted cone-shaped casing and a plurality of fixed swirl vanes on the outer periphery of the casing instead of the blades 16a.

[0024] 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 pulverizing table 12 to be pulverized again, and the fine pulverized fuel is led 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 pulverized fuel supply flow path (pulverized fuel supply pipe) 120 and supplied to the burner 220 of the boiler 200.

[0025] The coal feed pipe (fuel supply unit) 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 feed pipe 17 to the center of the grinding table 12. A coal feeder 25 is connected to the upper end of the coal feed pipe 17, and solid fuel is supplied thereto.

[0026] The coal feeder 25 is connected to the bunker 21 by a downspout 22, which is a pipe extending vertically 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 midway through the downspout 22. The coal feeder 25 includes a conveying unit 26 and a coal feeder motor 27. The conveying unit 26 is, for example, a belt conveyor, and conveys the solid fuel discharged from the lower end of the downspout 22 to the upper part of the coal feed pipe 17 by the driving force of the coal feeder motor 27, and then deposits it 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 conveying unit 26.

[0027] Normally, primary air is supplied to the inside of the mill 10 to transport pulverized fuel to the burner 220, and the pressure is higher than that of the coal feeder 25 and the bunker 21. Inside the downspout section 22 that connects the bunker 21 and the coal feeder 25, fuel is layered. This solid fuel layer ensures a sealing property (material seal) that prevents the primary air and pulverized fuel from flowing back from the mill 10 toward the bunker 21.

[0028] The blower 30 is a device that blows primary air into the housing 11 to dry the pulverized fuel and transport it to the rotary classifier 16 . In this embodiment, the blower section 30 is equipped with 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 in order to appropriately adjust the flow rate and temperature of the primary air blown into the inside of the housing 11.

[0029] In this embodiment, the hot gas flow path 30a supplies a portion 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.

[0030] The cold gas flow path 30b supplies a portion of the air sent out from the primary air ventilator 31 as cold gas at room temperature. A cold gas damper 30d is provided in the cold gas flow path 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 flow path 30b is determined by the opening degree of the cold gas damper 30d.

[0031] 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 into the housing 11 may be adjusted by, for example, introducing a portion 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 the same. By adjusting the oxygen concentration in the primary air, for example, when a highly ignitable (easily ignitable) solid fuel is used, it is possible to prevent the solid fuel from igniting on the path from the mill 10 to the burner 220.

[0032] In this embodiment, 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 of this embodiment is, for example, a differential pressure measurement means, and measures the differential pressure of the mill 10 as the differential pressure between the pressure at the portion where primary air flows from the primary air flow path 110 into the inside of the housing 11 and the pressure at the outlet port 19 where the primary air and pulverized fuel are discharged from the inside of the housing 11 to the pulverized fuel supply flow path 120. An increase or decrease in this differential pressure of the mill 10 corresponds to an increase or decrease in the amount of 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. In other words, 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 an amount of pulverized fuel corresponding to the amount of solid fuel supplied to the mill 10 can be stably supplied to the burner 220 installed in the boiler 200. Furthermore, the state detection unit 40 of this embodiment is, for example, a temperature measurement means that 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 primary air and 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 do not exceed them. Each upper limit temperature is determined taking into consideration the possibility of ignition depending on the properties of the solid fuel. Note that, since the primary air is cooled inside the housing 11 by drying and transporting the pulverized fuel, the primary air temperature at the mill inlet is, for example, from room temperature to approximately 300°C, and the primary air temperature at the mill outlet is, for example, from room temperature to approximately 90°C.

[0033] The control unit 50 is a device that controls each part of the solid fuel pulverizer 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 to the burner 220 an amount of pulverized fuel corresponding to the amount of solid fuel supplied to the mill 10 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. Furthermore, the control unit 50 can adjust the amount of solid fuel supplied to the mill 10 (amount of coal supply) by transmitting a drive command to the coal supply motor 27, for example. Furthermore, the control unit 50 can adjust the flow rate and temperature of the primary air by controlling the opening rates of the hot gas damper 30c and the cold gas damper 30d by transmitting an opening rate instruction to the blower unit 30. Specifically, the control unit 50 controls the opening rates 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 rate for each type of solid fuel. Note that the temperature of the primary air may also be controlled by controlling the temperature at the mill inlet (mill inlet primary air temperature).

[0034] The control unit 50 is composed of, for example, a central processing unit (CPU), random access memory (RAM), read-only memory (ROM), and a computer-readable storage medium. A series of processes for implementing various functions is stored in a storage medium, for example, in the form of a program. The CPU reads the program into the RAM and executes information processing and arithmetic operations to implement 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 be replaced with a solid-state disk (SSD), for example.

[0035] Next, a description will be given of the boiler 200 that generates steam by burning the pulverized fuel supplied from the solid fuel pulverizer 100. The boiler 200 includes a furnace 210 and a burner 220.

[0036] 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 passage 120 and secondary air supplied by heating air (outside air) sent out from a forced draft fan (FDF) 32 with an air preheater 34. The pulverized fuel is burned in the furnace 210, and the high-temperature combustion gas passes through heat exchangers (not shown) such as an evaporator, a superheater, and a coal economizer before being discharged to the outside of the boiler 200.

[0037] The combustion gas discharged from the boiler 200 undergoes predetermined treatment in environmental equipment (such as a denitration device, dust collector, and desulfurization device, not shown), and then undergoes heat exchange with primary air and secondary air in an air preheater 34. The gas 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 delivered 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 the boiler 200 is heated in a coal economizer (not shown), and then further heated in an evaporator (not shown) and a superheater (not shown) to generate high-temperature, high-pressure superheated steam, which is then sent to the steam turbine (not shown), which is the power generation section, to rotate and drive the steam turbine, which then rotates and drives a generator (not shown) connected to the steam turbine to generate electricity, thereby constituting the power generation plant 1.

[0038] The solid fuel used is not limited to the coal and biomass fuel exemplified above, but may be petroleum coke (PC), etc. Furthermore, these solid fuels may be used in combination.

[0039] [About the crushing roller unit] As shown in FIG. 3, the crushing roller unit 300 includes a crushing roller having a journal shaft (shaft portion) 310 and a roller portion 320, and a roller journal protector 400.

[0040] The journal shaft 310 is a shaft member extending with the axis line X as its central axis, with its tip end positioned above the grinding table 12 and its base end inserted into the support arm 44 of the journal head 43, and supported and held by the support arm 44.

[0041] A roller portion 320 is attached to the tip portion of the journal shaft 310 via a rolling bearing 330. The rolling bearing 330 is, for example, a roller bearing having an outer ring, an inner ring, and rollers as rolling elements.

[0042] The roller portion 320 is a portion that crushes the solid fuel between itself and the crushing table 12 . The roller portion 320 includes a bearing housing 322 and a roller body 321 .

[0043] The bearing housing 322 is a portion that houses the tip portion of the journal shaft 310 and holds the rolling bearing 330 . Specifically, the outer ring of the rolling bearing 330 is fitted onto the inner peripheral surface of the bearing housing 322. Furthermore, the outer peripheral surface of the tip portion of the journal shaft 310 is fitted onto the inner ring of the rolling bearing 330. As a result, the bearing housing 322 (and thus the roller portion 320) is supported rotatably about the axis X relative to the journal shaft 310.

[0044] The roller body 321 is a member fitted onto the outer peripheral surface of the bearing housing 322 . When the grinding table 12 rotates with the outer circumferential surface of the roller body 321 in contact with the solid fuel on the upper surface of the grinding table 12, the roller part 320 receives a rotational force from the grinding table 12 via the solid fuel and rotates along with it.

[0045] The bearing housing 322 has a housing portion 323 and a cover portion 324 . The accommodation portion 323 is a component with open ends that holds the rolling bearing 330 inside and surrounds the tip portion of the journal shaft 310 around the axis X (that is, accommodates the tip portion of the journal shaft 310). The lid portion 324 is a component that closes an opening of the accommodation portion 323 on the tip side of the journal shaft 310. The lid portion 324 is fastened to the accommodation portion 323 by, for example, a bolt or the like.

[0046] A sealing mechanism 325 is attached to the opening of the accommodation portion 323 on the base end side of the journal shaft 310 so as to close the gap between the accommodation portion 323 and the journal shaft 310 . This sealing mechanism 325 has the function of sealing the gap between the bearing housing 322, which is a rotating body, and the journal shaft 310, which is a non-rotating body, thereby preventing the movement of substances (pulverized fuel, bearing lubricating oil, etc.) through the gap.

[0047] A recess 44a formed in an annular shape around the axis X is provided on the inner peripheral surface of the portion of the support arm 44 into which the journal shaft 310 is inserted. A seal air flow path 44b is formed in the support arm 44, connecting the front surface of the support arm 44 facing the seal mechanism 325 with the recess 44a. A cylindrical cover 44c having a cylindrical portion that covers the entire outer peripheral surface of the seal mechanism 325 is attached to the front surface of the support arm 44.

[0048] Seal air is supplied from the outside to the space defined by the recess 44a and the outer circumferential surface of the journal shaft 310. The seal air is, for example, a branched portion of the cold gas. The supplied seal air is then ejected toward the sealing mechanism 325 via the seal air flow path 44b. The seal air then passes through the gap between the outer circumferential surface of the sealing mechanism 325 and the inner circumferential surface of the cylindrical portion of the cylindrical cover 44c and is ejected outside the system of the grinding roller unit 300. This protects the sealing mechanism 325 from pulverized fuel present inside the mill 10.

[0049] [About roller journal protectors] 3 and 4, the roller journal protector 400 (hereinafter simply referred to as "protector 400") is a member detachably attached to the front surface of the support arm 44. For the sake of explanation, the roller portion 320 is not shown in FIG. As shown in Figure 3, the roller journal protector 400 is installed in the vertical direction (up and down direction in Figure 3) in the space (narrow portion) between the journal shaft 310 and the air outlet 13 located on the outer periphery of the rotary table 12. In other words, the air outlet 13 is located below the roller journal protector 400. In other words, the roller journal protector 400 is a component for protecting the journal shaft 310, the support arm 44 of the journal head 43, the cylindrical cover 44c, the roller portion 320, etc. from the collision of pulverized fuel blown up by the flow of primary air blown out from the outlet 13.

[0050] The protector 400 has a mounting panel portion 410 and a shield portion 420 . Examples of materials for the mounting panel portion 410 and the shield portion 420 include steel materials such as carbon steel and stainless steel. Ceramic tiles made of hard ceramic with excellent wear resistance may be attached to the portions of the mounting panel portion 410 and the shield portion 420 where collision with pulverized fuel is expected. Examples of hard ceramics include alumina, silica, zirconia, magnesia, silicon carbide, silicon nitride, etc., or mixtures of these. Also, hardened plates may be used instead of ceramic tiles.

[0051] 5 and 6, the mounting panel portion 410 is a flat plate material attached to the front surface of the support arm 44. The mounting panel portion 410 is fixed to the outer peripheral surface of the lower part of the support arm 44 by bolts inserted into bolt mounting portions 414 formed on the back surface (see second divided protector 402 shown in FIG. 8). The mounting panel portion 410 extends below the journal shaft 310 in a plane substantially perpendicular to the axis X. The mounting panel portion 410 is a member that mainly protects the lower front surface of the support arm 44 from pulverized fuel.

[0052] The mounting panel portion 410 has a generally semicircular arc-shaped central upper edge 411 that conforms to the shape of the lower portion of the support arm 44. The mounting panel portion 410 extends in a planar shape from this central upper edge 411 to both sides in the horizontal direction and downward. The edges (side edges 413) located on both sides of the mounting panel portion 410 are formed in an approximately quarter-circular arc shape, and the dimension from one side edge 413 to the other side edge 413 decreases from the top to the bottom of the protector 400. Eye plates (mooring portions) 412a are provided on horizontal edges (side upper edges 412) on both sides of central upper edge 411 of mounting panel portion 410. Note that instead of eye plates 412a, bolt seats (internal thread portions) to which an eyebolt or the like can be attached may be provided.

[0053] The shield part 420 is a plate material having a semi-frustum shape (flared shape) that surrounds the lower part of the journal shaft 310 in the circumferential direction relative to the axis X. The shield portion 420 is a member that mainly protects the journal shaft 310, the cylindrical cover 44c, and the roller portion 320 from the impact of the blown-up pulverized fuel.

[0054] A base end edge 421 of the shield part 420 is formed in a generally semicircular arc shape along the central upper edge 411 of the mounting panel part 410, and is connected to the front surface of the mounting panel part 410 and the lower part of the central upper edge 411. The mounting panel part 410 and the shield part 420 are connected by welding, for example.

[0055] A tip edge 422 of the shield part 420 is formed in a substantially semicircular arc shape and is located closer to the roller body 321 than the base edge 421. At this time, the semicircle formed by the tip edge 422 has a larger diameter than the semicircle formed by the base edge 421. In other words, the shield part 420 extends from the mounting panel part 410 toward the roller part 320 while expanding in diameter.

[0056] 6, a bottom cover 415 may be provided on the back surface of the mounting panel 410. The bottom cover 415 is a semicircular arc-shaped plate extending from the mounting panel 410 toward the housing 11. By providing the lower surface cover portion 415, the lower portion of the support arm 44 of the journal head 43 can be protected from the impact of the blown-up pulverized fuel.

[0057] The protector 400 configured as described above is divided in the circumferential direction about the axis X at a division line 405 along the direction of the axis X. Naturally, the division line 405 is formed across the mounting panel portion 410, the shield portion 420, and the lower cover portion 415. 4, the protector 400 is divided into a first divided protector 401 and a second divided protector 402. The protector 400 may be divided into three or more parts.

[0058] The first divided protector 401 is a portion that constitutes the right half of the protector 400 when viewed from the front in the direction of the axis X. A first fixing portion 401a is formed in an upwardly extending manner on the portion of first divided protector 401 facing second divided protector 402 (the edge portion forming dividing line 405), and is fastened to a second fixing portion 402a (described later) with a bolt or the like. The upper surface of first fixing portion 401a is inclined at an angle equal to or greater than the angle of repose of the pulverized fuel to prevent accumulation of the pulverized fuel.

[0059] The second divided protector 402 is a portion that constitutes the left half of the protector 400 when viewed from the front in the direction of the axis X. A second fixing portion 402a is formed in an upwardly extending manner on the portion of second divided protector 402 facing first divided protector 401 (the edge portion forming dividing line 405), and is fastened to first fixing portion 401a with a bolt or the like. The upper surface of second fixing portion 402a is inclined at an angle equal to or greater than the angle of repose of pulverized fuel to prevent accumulation of pulverized fuel.

[0060] The first divided protector 401 and the second divided protector 402 are fastened and fixed at the first fixing portion 401a and the second fixing portion 402a, and constitute an integrated protector 400, except during maintenance. On the other hand, during maintenance, which will be described later, the first divided protector 401 and the second divided protector 402 can be separated from each other by releasing the fastening and fixing.

[0061] It is preferable that the first fixing portion 401a and the second fixing portion 402a (division line 405) are disposed directly below the axis X, that is, in the narrowest part of the narrow section. In this case, the first divided protector 401 and the second divided protector 402 have symmetrical shapes with respect to the division line 405.

[0062] 2, the crusher roller unit 300 having the protector 400 is installed in the opening 11a formed in the housing 11, as described above. At this time, frame members 11b extending in the vertical direction are present on both sides of the mounting panel portion 410 of the protector 400. The side edges 413 of the mounting panel portion 410 are formed in a roughly quarter-circular arc shape in consideration of workability during maintenance, which will be described later, and therefore a gap is formed between the side edges 413 and the frame members 11b. 5 and 6, extension panel portions 430 for closing the gap may be attached to both sides of the mounting panel portion 410. The extension panel portions 430 are fastened to the mounting panel portion 410 with bolts or the like inserted from the rear surface thereof, for example.

[0063] [How to remove / install] The protector 400 is a component for protecting the journal shaft 310, the support arm 44 of the journal head 43, the cylindrical cover 44c, the roller portion 320, etc. from the collision of blown-up pulverized fuel, and is therefore attached to the grinding roller unit 300 when the mill 10 is in operation.

[0064] However, since the protector 400 is installed in the space (narrow portion) between the journal shaft 310 and the air outlet 13 located on the outer periphery of the crushing table 12, when replacing or repairing the protector 400 (hereinafter collectively referred to as "maintenance"), the protector 400 must be removed from the crushing roller unit 300.

[0065] Therefore, in this embodiment, the protector 400 is divided into a first divided protector 401 and a second divided protector 402, and then each of the divided protectors is removed from the crushing roller unit 300. This allows the first divided protector 401 and the second divided protector 402, which are smaller than the integrated protector 400, to be handled, and the protector 400 can be removed inside the housing 11 without pulling out the entire crushing roller unit 300 to the outside of the housing 11.

[0066] A specific example of the removal method will be described below. As shown in FIG. 7, first, each extension panel portion 430 is removed from the first divided protector 401 and the second divided protector 402 (extension panel removing step).

[0067] Next, the first fixed portion 401a and the second fixed portion 402a are released from the fixation to separate the first divided protector 401 and the second divided protector 402 (separation step). Also, the fixation between the mounting panel portion 410 and the crushing roller unit 300 (support arm 44 of the journal head 43) is released.

[0068] Next, the first divided protector 401 is rotated around the axis X so as to follow the outer peripheral surface of the journal shaft 310, and is then lifted up and moved to a position where maintenance is easy (for example, above the journal shaft 310) (moving step). In the figure, the first divided protector 401 is rotated counterclockwise. At this time, first divided protector 401 can be easily lifted by hanging a hoisting tool (such as a chain block) on eye plate 412a. Furthermore, if the first fixing portion 401a is positioned in the narrowest part of the narrow section before the protector 400 is divided, the first divided protector 401 can be moved without passing through the narrow section. Furthermore, when the first split protector 401 is lifted up while rotating around the axis X so as to follow the outer peripheral surface of the journal shaft 310, the first split protector 401 can be slid along the axis X toward the roller portion 320, thereby preventing the bolt mounting portion 414 and the lower cover portion 415 installed on the back surface of the first split protector 401 from interfering with the journal head 43 and the support arm 44.

[0069] For safety, first divided protector 401 that has moved to the top of journal shaft 310 is fixed in place by a sling hung on eye plate 412a.

[0070] By removing the extension panel portion 430 in advance, the first divided protector 401 can be lifted without interfering with the frame material 11b. For this reason, the side edge 413 needs to be formed in a shape that does not interfere with the frame material 11b during the moving process. In this embodiment, the shape of the side edge 413 is a quarter-circular arc, but other shapes may also be used.

[0071] The second divided protector 402 can also be moved to a position where maintenance is easy (for example, above the journal shaft 310) by rotating it around the axis X so as to fit along the outer peripheral surface of the journal shaft 310, following the same procedure as for the first divided protector 401. In the case of the same figure, the second divided protector 402 is rotated clockwise.

[0072] The moving step may be performed as follows. 8, before the moving step, first divided protector 401 and roller part 320 may be connected with connecting device (connecting part) 440 (connecting step), and first divided protector 401 may be rotated smoothly. Also, first divided protector 401 may be rotated together with roller part 320 by rotating it.

[0073] As a specific example, the connecting device 440 has a band portion 441 and an arm portion 442 . Band portion 441 is a portion that is fitted onto the outer peripheral surface of the base end portion of bearing housing 322 of roller portion 320. Band portion 441 is preferably one that allows adjustment of the tightening force, thereby making it possible to tighten bearing housing 322 or loosen the tightening force. The arm portion 442 is a portion that protrudes radially from the band portion 441. A fastener such as a bolt 443 is provided on the arm portion 442, and this bolt 443 is fixed to the mounting panel portion 410 of the first divided protector 401. The first divided protector 401 and the roller portion 320 are connected by the bolt 443 configured as described above.

[0074] It is preferable to hold first divided protector 401 with bolts 443 provided at two or more points. This is because, when first divided protector 401 is rotated and lifted along roller portion 320, the direction of the weight of first divided protector 401 that is applied to bolts 443 during rotation changes, and a twisting force acts on the bolts, preventing the bolts from loosening. Furthermore, the bolts 443 may be inserted into mounting holes provided in the mounting panel portion 410 of the first divided protector 401 and fixed by clamping nuts on both sides of the mounting panel portion 410. By fixing in this manner, when the first divided protector 401 is lifted up while rotating around the axis X along the outer circumferential surface of the journal shaft 310, the first divided protector 401 can be slid along the axis X toward the roller portion 320 by turning the nuts. Therefore, the bolt mounting portion 414 and the lower surface cover portion 415 provided on the back surface of the first divided protector 401 can be prevented from interfering with the journal head 43 and the support arm 44.

[0075] After the maintenance is completed, the protector 400 must be attached to the crushing roller unit 300 by following the removal procedure in reverse. However, when returning first divided protector 401 to the predetermined mounting position, it is preferable to adjust the rotation speed with a suspender so that first divided protector 401 does not rotate suddenly due to its own weight.

[0076] [Variations] 9, first fixing portion 401a and second fixing portion 402a may be configured to overlap with each other in the thickness of protector 400. Specifically, overlapping portion 401b is formed below first fixing portion 401a, extending toward second divided protector 402 and contacting the lower surface of shield portion 420 of second divided protector 402. Moreover, overlapping portion 401b may extend not only to shield portion 420 but also to mounting panel portion 410 and lower cover portion 415 along dividing line 405. This makes it possible to improve the abrasion resistance in the vicinity of the dividing line 405. Furthermore, it also becomes easier to position the first divided protector 401 and the second divided protector 402. The overlapping portion 401b may be formed in the second fixed portion 402a.

[0077] This embodiment has the following advantages. That is, when removing the protector 400 from the crusher roller unit 300, it is only necessary to handle the first divided protector 401 and the second divided protector 402, which are smaller than the integrated protector 400, and therefore the protector 400 can be removed inside the housing 11 without pulling out the entire crusher roller unit 300 to the outside of the housing 11. This reduces the effort and cost required to remove the protector 400.

[0078] Furthermore, since the extension panel portion 430 is detachable from the mounting panel portion 410, the extension panel portion 430 can appropriately protect the journal head 43 (specifically, the support arm 44) when the mill 10 is in operation. Furthermore, when removing the protector 400 from the crushing roller unit 300 during maintenance, removing the extension panel portion 430 makes it easier to handle the first divided protector 401 and the second divided protector 402.

[0079] Furthermore, when the connecting device 440 is provided, by connecting the first divided protector 401 and the second divided protector 402 to the roller part 320 when removing the protector 400 from the crusher roller unit 300, the first divided protector 401 and the second divided protector 402 can be easily and smoothly lifted from below the journal shaft 310 to above the journal shaft 310. This allows the first divided protector 401 and the second divided protector 402 to be easily moved to a position where maintenance is easy. Furthermore, when the connecting device 440 supports the first split protector 401 and the second split protector 402 so that they can move in the direction of the axis X, the first split protector 401 and the second split protector 402 can be easily moved to a position where they do not interfere with the journal head 43 and the support arm 44.

[0080] Furthermore, since the eye plate 412a is provided, when the protector 400 is removed from the crushing roller unit 300, the first divided protector 401 and the second divided protector 402 can be easily lifted with a lifting tool.

[0081] The roller journal protector and removal method according to the present embodiment described above can be understood, for example, as follows. That is, a roller journal protector (400) according to one aspect of the present disclosure includes a journal head (43) disposed in an opening (11a) formed in a peripheral wall of a housing (11) of a crusher (10), a shaft portion (310) having an axis (X) extending toward a crushing table (12) of the crusher (10) and supported by the journal head (43), and a crushing roller having a roller portion (320) rotatably attached to the shaft portion (310) about the axis (X) and crushing solid fuel on the crushing table (12), and a conveying gas is disposed between the peripheral wall and the crushing table (12) and extends upward. The roller journal protector (400) is attached to a crushing roller unit (300) in which an outlet (13) from which the carrier gas is blown out is disposed below the shaft portion (310), and includes: an attachment panel portion (410) attached to the journal head (43); and a shield portion (420) formed in a semi-frustum shape surrounding the lower portion of the shaft portion (310) in the circumferential direction about the axis (X), with a base end fixed to the attachment panel portion (410) and a tip end extending toward the roller portion (320), covering the portion of the shaft portion (310) that is hit by the carrier gas blown out from the outlet (13), and is separable in the circumferential direction.

[0082] The roller journal protector (400) according to this embodiment includes an attachment panel portion (410) attached to the journal head (43), and a shield portion (420) formed in a semi-frustum shape surrounding the lower part of the shaft portion (310) in the circumferential direction about the axis (X), with its base end fixed to the attachment panel portion (410) and its tip end extending toward the roller portion (320) to cover the portion of the shaft portion (310) that is hit by the carrier gas blown out from the outlet (13). The roller journal protector (400) (hereinafter simply referred to as "protector (400)") can therefore be split in the circumferential direction when removing the roller journal protector (400) from the crusher roller unit (300) (hereinafter the split protector (400) will also be referred to as "split protectors (401, 402)"). As a result, when removing the protector (400) from the crushing roller unit (300), it is only necessary to handle the split protectors (401, 402), which are smaller than the integrated protector (400), and the protector (400) can be removed without pulling out the entire crushing roller unit (300) from the housing (11). This reduces the effort and cost required to remove the protector (400).

[0083] In addition, a roller journal protector (400) according to one embodiment of the present disclosure includes an extension panel portion (430) that closes the gap between the mounting panel portion (410) and the housing (11) that defines the opening (13), and the extension panel portion (430) is detachable from the mounting panel portion (410).

[0084] The roller journal protector (400) according to this embodiment is provided with an extension panel portion (430) that closes the gap between the mounting panel portion (410) and the housing (11) that defines the opening, and the extension panel portion (430) is detachable from the mounting panel portion (410). Therefore, the journal head (43) can be appropriately protected by the extension panel portion (430) when the crusher (10) is in operation, and when the protector (400) is removed from the crushing roller unit (300), the extension panel portion (430) can be removed, making it easier to handle the split protectors (401, 402).

[0085] Moreover, the roller journal protector (400) according to one aspect of the present disclosure includes a connecting portion (440) that can be connected to the roller portion (320).

[0086] The roller journal protector (400) according to this embodiment is provided with a connecting portion (440) that can be connected to the roller portion (320), so that when removing the protector (400) from the crusher roller unit (300), by connecting the protector (400) to the roller portion (320), the split protectors (401, 402) can be easily and smoothly lifted from below the shaft portion (310) to above the shaft portion (310). This allows the split protectors (401, 402) to be easily moved to positions where maintenance is easier. Furthermore, when the connecting portion (440) supports the protector (400) so as to be movable in the direction of the axis X, the split protectors (401, 402) can be easily moved to positions where they do not interfere with the journal head (43) and the support arm (44).

[0087] The roller journal protector (400) according to one aspect of the present disclosure also includes a mooring portion (412a) for hanging a sling.

[0088] The roller journal protector (400) according to this embodiment is provided with a mooring portion (412a) for hanging a sling, so that the split protectors (401, 402) can be easily lifted by the sling when removing the protector (400) from the crushing roller unit (300).

[0089] Furthermore, the roller journal protector (400) according to one embodiment of the present disclosure can be divided into two parts along a dividing line (405) along the direction of the axis (X), and the dividing line (405) is located vertically below the shaft portion (310).

[0090] The roller journal protector (400) according to this embodiment can be split into two at a split line (405) along the axis (X), and the split line (405) is located vertically below the shaft portion (310). Therefore, when removing the protector (400) from the crusher roller unit (300), it is not necessary to pass the split protectors (401, 402) through the narrowest part of the narrow section. This makes it easy to move the split protectors (401, 402).

[0091] A removal method according to one aspect of the present disclosure is a method for removing a crushing roller unit (300) comprising: a journal head (43) arranged in an opening (11a) formed in a peripheral wall of a housing (11) of a crusher (10); a shaft portion (310) supported by the journal head (43) and having an axis (X) extending toward a crushing table (12) of the crusher (10); a crushing roller having a roller portion (320) rotatably attached to the shaft portion (310) about the axis (X) and crushing solid fuel on the crushing table; and a roller journal protector (400), wherein an outlet (13) provided between the peripheral wall and the crushing table (12) and through which a carrier gas is blown upward is arranged below the shaft portion (310), The roller journal protector (400) has an attachment panel portion (410) attached to the journal head (43), and a shield portion (420) formed in a semi-frustum shape surrounding the lower part of the shaft portion (310) in the circumferential direction about the axis (X), with its base end fixed to the attachment panel portion (410) and its tip end extending toward the roller portion (320), and covering the part of the shaft portion (310) that is hit by the carrier gas blown out from the outlet (13).The roller journal protector (400) is dividable in the circumferential direction, and the method includes a dividing step of dividing the roller journal protector (400), and a moving step of moving each of the divided roller journal protectors (400) to the upper part of the shaft portion (310) so as to align it with the outer peripheral surface of the shaft portion (310).

[0092] In addition, in a removal method according to one embodiment of the present disclosure, the roller journal protector (400) is provided with an extension panel portion (430) that closes the gap between the mounting panel portion (410) and the housing (11) that defines the opening, and the removal method includes a removal step of removing the extension panel portion (430) before the moving step.

[0093] In addition, in a removal method according to one aspect of the present disclosure, the roller journal protector (400) is provided with a connecting portion (440) that can be connected to the roller portion (320), and the method includes a connecting step, prior to the moving step, of connecting the divided roller journal protector (400) to the roller portion (320) via the connecting portion (440).

[0094] In addition, in a removal method according to one aspect of the present disclosure, the roller journal protector (400) is provided with a mooring portion (412a) for hanging a sling, and in the moving process, the sling is hung on the mooring portion (412a) and the roller journal protector (400) is rotated along the shaft portion (310). [Explanation of symbols]

[0095] 1. Power Plant 10 Mill (Grinder) 11. Housing 11a opening 11b Frame material 12 Grinding Table 12a Swirl blade 13. Carrier gas outlet 14 Reducer (drive transmission part) 15 Mill motor (drive unit) 16 Rotary classifier (classifying section) 16a blade 17 Coal feed pipe (fuel supply section) 18 Classifier motor 19 Exit Port 21 Bunka (storage section) 22 Downspout 25 Coal feeding machine (fuel supply machine) 26 Conveying section 27 Coal feeder motor 30 Blower (Carrier Gas Supply) 30a Hot gas flow path 30b Cold gas flow path 30c Thermal 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 part 42 Ceiling 43 Journal Head 44 Support arm 44a Recess 44b Seal air passage 44c Cylindrical cover 45 Support shaft 46 Pressing device (crushing load applying part) 50 control section 100 Solid fuel crusher 110 Primary air flow path (carrier gas flow path) 120 Pulverized fuel supply passage (pulverized fuel supply pipe) 200 boiler 210 Furnace 220 Burner (combustion device) 300 Crushing Roller Unit 310 Journal shaft (shaft) 320 Roller part 321 Roller body 322 Bearing box 323 Storage Unit 324 Lid 325 Sealing mechanism 330 Rolling bearings (bearings) 400 Roller Journal Protector 401 First divided protector 401a 1st fixed part 401b Duplicate part 402 Second split protector 402a 2nd fixed part 405 Dividing Line 410 Mounting panel 411 Upper center edge 412 Lateral upper border 412a Eye plate (mooring part) 413 Side edge 414 Bolt mounting part 415 Lower cover part 420 Shield part 421 Proximal edge 422 Tip edge 430 Extension panel section 440 Connecting device (connecting part) 441 Band Club 442 Arm 443 volts

Claims

1. a journal head disposed in an opening formed in a peripheral wall of a housing of the crusher; a grinding roller having a shaft portion supported by the journal head and having an axis extending toward a grinding table of the grinder, and a roller portion rotatably attached to the shaft portion about the axis to grind the solid fuel on the grinding table; a roller journal protector provided with an outlet between the peripheral wall and the grinding table, through which a carrier gas is blown upward, the outlet being attached to a grinding roller unit disposed below the shaft portion, a mounting panel portion attached to the journal head; a shield part formed in a semi-frustum shape surrounding a lower part of the shaft part in a circumferential direction about the axis, a base end part fixed to the mounting panel part, a tip part extending toward the roller part, and covering a part of the shaft part that is hit by the carrier gas blown out from the blowout port; and The roller journal protector is separable in the circumferential direction.

2. an extension panel portion that closes a gap between the mounting panel portion and the housing that defines the opening; 2. The roller journal protector according to claim 1, wherein the extension panel portion is detachable from the mounting panel portion.

3. 3. The roller journal protector according to claim 1, further comprising a connecting portion connectable to the roller portion.

4. 4. The roller journal protector according to claim 1, further comprising a mooring portion for hanging a sling.

5. The device can be divided into two parts along a dividing line extending in the direction of the axis, 5. The roller journal protector according to claim 1, wherein the dividing line is located vertically below the shaft portion.

6. a journal head disposed in an opening formed in a peripheral wall of a housing of the crusher; a grinding roller having a shaft portion supported by the journal head and having an axis extending toward a grinding table of the grinder, and a roller portion rotatably attached to the shaft portion about the axis and for grinding the solid fuel on the grinding table; a roller journal protector; a blowout port provided between the peripheral wall and the grinding table, through which a carrier gas is blown upward, being disposed below the shaft portion, The roller journal protector comprises: a mounting panel portion attached to the journal head; a shield part formed in a semi-frustum shape surrounding a lower part of the shaft part in a circumferential direction about the axis, the shield part having a base end fixed to the mounting panel part and a tip end extending toward the roller part, the shield part covering a part of the shaft part that comes into contact with the carrier gas blown out from the blowout port; and It is possible to divide it in the circumferential direction, a dividing step of dividing the roller journal protector; The removal method includes a moving step of moving each of the divided roller journal protectors to an upper portion of the shaft portion so as to align the protectors along the outer peripheral surface of the shaft portion.

7. the roller journal protector includes an extension panel portion that closes a gap between the mounting panel portion and the housing that defines the opening; 7. The method of claim 6, further comprising the step of removing the extension panel portion before the moving step.

8. the roller journal protector includes a connecting portion connectable to the roller portion, 8. The removing method according to claim 6, further comprising a connecting step of connecting the divided roller journal protectors to the roller portions at the connecting portions before the moving step.

9. The roller journal protector includes a mooring portion for hanging a sling, 9. The removal method according to claim 6, wherein in the moving step, the sling is hung on the mooring portion and the roller journal protector is rotated along the shaft portion.

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