Solid fuel pulverizing device, power generation plant, and roller wear amount monitoring method

Abstract

To provide a solid fuel pulverization device, a power plant, and a roller wear monitoring method capable of improving accuracy of monitoring a wear state.SOLUTION: A solid fuel pulverization device includes: a pulverization table on which a solid fuel is placed; a pulverization roller 13 that presses and pulverizes the solid fuel placed on the pulverization table; a journal head 45 that supports the pulverization roller 13 and swings and is displaced integrally with the pulverization roller 13; and a monitoring part 101 provided fixedly to the journal head 45 to monitor a wear state of an outer surface of the pulverization roller 13.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present disclosure relates to a solid fuel pulverizing device, a power generation plant, and a method for monitoring roller wear amount.

Background Art

[0002] Conventionally, solid fuels such as coal and biomass fuels (carbon-containing solid fuels) are pulverized into fine powders within a predetermined particle size range by a pulverizer (mill) and supplied to a combustion device. The mill sandwiches solid fuels such as coal and biomass fuels input to a pulverizing table between the pulverizing table and a pulverizing roller, pulverizes them, and classifies fine powder fuels within a predetermined particle size range among the solid fuels pulverized into fine powders by a conveying gas (primary air) supplied from the outer periphery of the pulverizing table using a classifier, conveys them to a boiler, and burns them in a combustion device. In a thermal power generation plant, steam is generated by heat exchange with combustion gas generated by burning fine powder fuel in a boiler, a steam turbine is rotationally driven by the steam, and power generation is performed by rotationally driving a generator connected to the steam turbine.

[0003] The outer peripheral surface of the roller that performs pulverization wears due to long-term use in contact with solid fuel. Therefore, although the outer periphery of the roller is manufactured from a highly wear-resistant material, it is impossible to make the wear zero. As the wear of the roller progresses, the meshing between the pulverizing table and the roller deteriorates, and the pulverization performance decreases. Further, as the wear of the roller progresses, the wall thickness of the roller decreases, and the strength of the roller also decreases. For this reason, it is necessary to repair or replace a roller whose wear has progressed. As a method for detecting the progress state of roller wear, a method of manually measuring the wear amount during an internal inspection of the mill, a method of providing a detection device for detecting wear on the roller, etc. are known (for example, Patent Document 1).

[0004] Patent Document 1 discloses a mill in which an ultrasonic probe is provided as a sensor inside a hollow support shaft that supports a grinding roller. In the mill of Patent Document 1, an ultrasonic pulse is transmitted from the ultrasonic probe, and the thickness (wear amount) of the roller is measured by measuring the time it takes for an echo from the bottom surface (reflection signal from the surface of the grinding roller) to return.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, when the sensor is provided inside the roller, the sensor rotates together with the roller, and the positions of the sensor and the surface of the roller do not move relative to each other. Therefore, it is difficult to monitor the wear state over a wide range on the roller surface. For this reason, locally occurring depressions may not be detected depending on the occurrence position. In response to this, when the number of sensors provided inside is increased, problems such as a decrease in the strength of the roller, an increase in installation costs, and an increase in maintenance costs when the sensor fails can be considered. When the roller is small, it may be difficult to provide a sensor inside.

[0007] The present disclosure has been made in view of such circumstances, and an object thereof is to provide a solid fuel pulverizing device and a power generation plant capable of improving the monitoring accuracy of the wear state, and a method for monitoring the wear amount of a roller.

Means for Solving the Problems

[0008] The first aspect of the present disclosure includes a grinding table on which solid fuel is placed, a grinding roller that presses and grinds the solid fuel placed on the grinding table, a journal head that supports the grinding roller and swings integrally with the grinding roller, and a monitoring unit that is fixedly provided on the journal head and monitors the wear state of the outer surface of the grinding roller. , the monitoring unit is configured by using a plurality of distance measuring sensors that measure the distance to the outer surface of the grinding roller, and includes a calculation unit that calculates the wear amount of the grinding roller based on the measurement results of the distance measuring sensors. It is a solid fuel pulverizing device.

[0009] The second aspect of the present disclosure is a method for monitoring the wear amount of a roller of a solid fuel pulverizing device, which includes a grinding table on which solid fuel is placed, a grinding roller that presses and grinds the solid fuel placed on the grinding table, and a journal head that supports the grinding roller and swings integrally with the grinding roller. It is configured by using a plurality of distance measuring sensors that measure the distance to the outer surface of the grinding roller, and includes a calculation unit that calculates the wear amount of the grinding roller based on the measurement results of the distance measuring sensors. The method for monitoring the wear amount of a roller is to monitor the wear state of the outer surface of the grinding roller by using a monitoring unit fixedly provided on the journal head.

Advantages of the Invention

[0010] According to the present disclosure, there is an effect that the monitoring accuracy of the wear state can be improved.

Brief Description of the Drawings

[0011]

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Embodiments for Carrying Out the Invention

[0012] 〔First Embodiment〕 The following describes a first embodiment of a solid fuel pulverizing device, a power generation plant, and a roller wear amount monitoring method according to the present disclosure with reference to the drawings.

[0013] As shown in FIG. 1, the power generation plant 1 according to the present embodiment includes a solid fuel pulverizing device 100 and a boiler 200. In the following description, "upward" refers to the vertically upward direction, and "upper" such as the upper part or the upper surface indicates the vertically upper part. Similarly, "down" indicates the vertically lower part, and the vertical direction includes an error and is not strict.

[0014] The solid fuel pulverizing device 100 of the present embodiment is, for example, a device that pulverizes solid fuels (carbon-containing solid fuels) such as coal and biomass fuel, generates pulverized fuel, and supplies it to the burner (combustion device) 220 of the boiler 200. The power generation plant 1 including the solid fuel pulverizing device 100 and the boiler 200 shown in FIG. 1 includes one solid fuel pulverizing device 100, but may also be a system including a plurality of solid fuel pulverizing devices 100 corresponding to each of the plurality of burners 220 of one boiler 200.

[0015] As shown in FIGS. 1 and 2, the solid fuel pulverizing device 100 of the present embodiment includes a mill (pulverizing section) 10, a coal feeder (fuel supply device) 20, a blower section (conveying gas supply section) 30, a state detection section 40, and a control device 50.

[0016] The mill 10 that pulverizes solid fuels such as coal and biomass fuel supplied to the boiler 200 into pulverized fuel, which is fine powder solid fuel, may be in a form that pulverizes only coal, a form that pulverizes only biomass fuel, or a form that pulverizes both coal and biomass fuel. Here, biomass fuel is a renewable organic resource derived from living organisms. For example, it includes thinned wood, waste wood, driftwood, grasses, waste, sludge, tires, and recycled fuels (pellets and chips) made from these materials, but is not limited to what is presented here. Since biomass fuel absorbs carbon dioxide during the growth process of biomass, it is considered carbon-neutral and does not emit carbon dioxide, a greenhouse gas, and thus its use is being variously studied.

[0017] Mill 10 includes a housing (casing) 11 that forms an outer shell, a grinding table (rotating table) 12 on which the solid fuel supplied into the housing is placed, a roller (grinding roller) 13 that presses and grinds the solid fuel placed on the grinding table 12, a drive unit 14 that rotationally drives the grinding table 12, a mill motor 15 connected to the drive unit 14 that rotationally drives the grinding table 12, a rotary classifier 16, a fuel supply unit 17, and a classifier motor 18 that rotationally drives the rotary classifier 16. The housing 11 is formed in a cylindrical shape extending in the vertical direction and is a casing that houses the grinding table 12, the roller 13, the rotary classifier 16, and the fuel supply unit 17. The inner peripheral surface 11a of the housing 11 is substantially cylindrical, and the central axis C1 (see FIG. 2) extending in the vertical direction of the housing 11 substantially coincides with the central axes of the grinding table 12 and the rotary classifier 16 described later. The fuel supply unit 17 is attached to the central part of the ceiling portion 42 of the housing 11. This fuel supply unit 17 supplies the solid fuel led from the bunker 21 into the housing 11, is arranged along the vertical direction at the central position of the housing 11, and its lower end extends to the inside of the housing 11.

[0018] The drive unit 14 is installed near the bottom 41 of the housing 11, and the grinding table 12 that rotates by the driving force transmitted from the mill motor 15 connected to this drive unit 14 is rotatably arranged. The crushing table 12 is a member having a circular shape in plan view and is arranged such that the lower end portion of the fuel supply unit 17 faces it. The upper surface of the crushing table 12 may have, for example, an inclined shape where the central portion is low and it becomes higher toward the outside, and the outer peripheral portion may have a shape that bends upward. The fuel supply unit 17 supplies solid fuel (for example, coal or biomass fuel in this embodiment) from above toward the lower crushing table 12, and the crushing table 12 crushes the supplied solid fuel between itself and the roller 13.

[0019] Also, a table liner 12a is provided on the crushing table 12. The table liner 12a is installed at a portion where the roller 13 contacts and presses against the upper surface of the crushing table 12, and protects the crushing table 12 from wear associated with the crushing of solid fuel. The table liner 12a is fixed to the crushing table 12 by a key or the like, rotates together with the crushing table 12 by the driving force transmitted from the driving unit 14, and cooperates with the roller 13 to crush the solid fuel.

[0020] When the solid fuel is fed from the fuel supply unit 17 toward the substantially central region of the grinding table 12, the solid fuel is guided to the outer peripheral side of the grinding table 12 by the centrifugal force generated by the rotation of the grinding table 12, and is sandwiched between the rollers 13 and ground. The ground solid fuel is blown upward by the conveying gas (hereinafter referred to as the primary air) introduced from the conveying gas flow path (hereinafter referred to as the primary air flow path) 100a, and is guided to the rotary classifier 16. The primary air flow path 100a supplies the primary air into the housing 11 through the primary air duct (conveying gas supply unit) 27 (see FIG. 2) that is connected to the housing 11 below the grinding table 12. On the outer periphery of the grinding table 12, there is provided an air outlet 25 for discharging the primary air flowing in from the primary air flow path 100a into the space above the grinding table 12 in the housing 11. A vane (swirling vane) 26 is installed at the air outlet 25 to impart a swirling force to the primary air blown out from the air outlet 25. The primary air imparted with the swirling force by the vane 26 becomes an air flow having a swirling speed component, and guides the solid fuel ground on the grinding table 12 to the upper rotary classifier 16 in the housing 11. Among the pulverized products of the solid fuel mixed with the primary air, those 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 to be ground again.

[0021] The roller 13 is a rotating body that grinds the solid fuel supplied from the fuel supply unit 17 to the grinding table 12. The roller 13 is pressed against the upper surface of the grinding table 12 and cooperates with the grinding table 12 to grind the solid fuel. Further, the roller 13 is provided with a monitoring unit 101, which will be described later. The details of the roller 13 and the monitoring unit 101 will be described later. In Fig. 1, only one roller 13 is shown as a representative, but a plurality of rollers 13 are arranged opposite to each other at regular intervals in the circumferential direction so as to press the upper surface of the grinding table 12. For example, three rollers 13 are arranged at equal intervals in the circumferential direction with an angular interval of 120° on the outer peripheral portion. In this case, the portions (pressing portions) where the three rollers 13 are in contact with the upper surface of the grinding table 12 are equidistant from the rotation center axis of the grinding table 12.

[0022] The roller 13 can swing (displace) up and down by the journal head 45 and is supported so as to be able to approach and separate from the upper surface of the grinding table 12. When the grinding table 12 rotates with the outer peripheral surface of the roller 13 in contact with the solid fuel on the upper surface of the grinding table 12, the roller 13 receives a rotational force from the grinding table 12 and rotates along with it. When solid fuel is supplied from the fuel supply unit 17, the solid fuel is pressed and crushed between the roller 13 and the grinding table 12 to become fine powder fuel.

[0023] The support arm 47 of the journal head 45 is supported by a support shaft 48 whose middle part is along the horizontal direction so that the roller 13 can swing up and down around the support shaft 48 on the side surface part 11b of the housing 11. Also, a pressing device 49 is provided at the upper end part vertically above the support arm 47. The pressing device 49 is fixed to the housing 11 and applies a load to the roller 13 via the support arm 47 and the like so as to press the roller 13 against the grinding table 12.

[0024] The drive unit 14 is a device that transmits a driving force to the grinding table 12 and rotates the grinding table 12 around the central axis. The drive unit 14 is connected to the mill motor 15 and transmits the driving force of the mill motor 15 to the grinding table 12.

[0025] The rotary classifier 16 is provided at the upper part of the housing 11 and has a hollow substantially inverted conical outer shape. The rotary classifier 16 is provided with a plurality of blades 16a extending in the vertical direction at its outer peripheral position. Each blade 16a is provided at a predetermined interval (equal interval) around the central axis of the rotary classifier 16. Further, the rotary classifier 16 classifies the solid fuel (pulverized fuel) pulverized by the roller 13 into those larger than a predetermined particle size (for example, 70 to 100 μm for coal) (hereinafter, the pulverized solid fuel larger than the predetermined particle size is referred to as "coarse powder fuel") and those smaller than or equal to the predetermined particle size (hereinafter, the pulverized solid fuel smaller than or equal to the predetermined particle size is referred to as "fine powder fuel"). The rotary classifier 16 that classifies by rotation is also called a rotary separator, and is rotationally driven by a classifier motor 18 controlled by a control unit 51, and rotates around the fuel supply unit 17 with a central axis (not shown) substantially coinciding with the central axis C1 extending in the vertical direction of the housing 11. Note that as the classifier, a fixed classifier having a fixed hollow inverted conical casing and a plurality of fixed swirling blades instead of the blades 16a at the outer peripheral position of the casing may be used.

[0026] The pulverized solid fuel that reaches the rotary classifier 16 is, due to the relative balance between the centrifugal force generated by the rotation of the blade 16a and the centripetal force due to the air flow of the primary air, the coarse powder fuel with a large diameter is knocked off by the blade 16a, returned to the pulverizing table 12, and pulverized again, and the fine powder fuel is guided to an outlet port (discharge part) 19 in the ceiling part 42 of the housing 11. The fine powder fuel classified by the rotary classifier 16 is discharged from the outlet port 19 to the fine powder fuel supply flow path 100b together with the primary air, and is conveyed to the subsequent process together with the primary air. The fine powder fuel flowing out to the fine powder fuel supply flow path 100b is supplied to the burner 220 of the boiler 200. The fine powder fuel supply flow path 100b is also called a fine coal pipe when the solid fuel is coal.

[0027] The fuel supply unit 17 is installed with its lower end extending along the vertical direction so as to penetrate the ceiling portion 42 of the housing 11 and reaching inside the housing 11, and supplies the solid fuel input from the upper part of the fuel supply unit 17 to a substantially central region of the pulverizing table 12. The fuel supply unit 17 is supplied with solid fuel from the stoker 20.

[0028] The stoker 20 includes a conveying unit 22 and a stoker motor 23. The conveying unit 22 is, for example, a belt conveyor, and conveys the solid fuel discharged from the lower end of the downspout portion 24 directly below the bunker 21 to the upper part of the fuel supply unit 17 of the mill 10 by the driving force provided by the stoker motor 23, and inputs it into the fuel supply unit 17 of the mill 10. The supply amount of the solid fuel supplied to the mill 10 is adjusted, for example, by changing the rotation speed of the stoker motor 23 to change the moving speed of the belt conveyor of the conveying unit 22. Normally, primary air for conveying pulverized solid fuel (pulverized fuel) to the burner 220 is supplied inside the mill 10, and the pressure is higher than that of the stoker 20 and the bunker 21. Fuel is held in a stacked state inside the downspout portion 24, which is a vertically extending pipe directly below the bunker 21, and the stacked solid fuel layer in the downspout portion 24 ensures a sealing property to prevent the primary air and pulverized fuel on the mill 10 side from flowing back to the bunker 21 side.

[0029] The chips and pellets of the biomass fuel before pulverization have a constant particle size (the size of the pellets is, for example, about 6 - 8 mm in diameter and about 40 mm or less in length) and are lightweight compared to coal fuel (that is, the particle size of coal before pulverization is, for example, about 2 - 50 mm). Therefore, when the biomass fuel is stored in the downspout portion 24, the gaps formed between the biomass fuels are larger than those in the case of coal fuel. Therefore, compared with the case of coal fuel, relatively large gaps are formed between the chips and pellets of biomass fuel in the downspout portion 24. As a result, the primary air and pulverized fuel blown up from inside the mill 10 pass through the gaps formed in the solid fuel layer, and a reverse flow of the primary air and pulverized fuel from inside the mill 10 through the feeder 20 to the bunker 21 may occur, which may reduce the pressure inside the mill 10. The possibility is higher compared with the case of coal fuel. In addition, when the primary air and pulverized fuel flow backward toward the bunker 21 side and the pressure inside the mill 10 decreases, various problems may occur in the stable operation of the solid fuel pulverizing apparatus 100 and the boiler 200, such as deterioration of the transportability of the pulverized fuel inside the mill 10, generation of dust inside the feeder 20 and above the bunker 21, ignition of the solid fuel inside the feeder 20, the bunker 21, and the downspout portion 24, and a decrease in the amount of fine pulverized fuel transported to the burner 220. For this reason, a rotary valve (not shown) may be provided in the middle of the fuel supply section 17 from the feeder 20 toward the inside of the mill 10 to suppress the occurrence of a reverse flow of the primary air and pulverized fuel from inside the mill 10 through the feeder 20 to the bunker 21.

[0030] The air supply section 30 is a device that blows primary air for drying the solid fuel pulverized by the roller 13 and transporting it to the rotary classifier 16 into the housing 11 through the primary air duct 27. In this embodiment, the air supply section 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 in order to appropriately adjust the flow rate and temperature of the primary air blown into the housing 11.

[0031] In this embodiment, the hot gas flow path 30a supplies a part of the air (outside air) sent from the primary air blower 31 as hot gas heated by passing through a heat exchanger (heater) 34 such as an air preheater. A hot gas damper (first blower section) 30c is provided on the downstream side of the hot gas flow path 30a. The opening degree of the hot gas damper 30c is controlled by the control unit 51. 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.

[0032] The cold gas flow path 30b supplies a part of the air sent from the primary air blower 31 as cold gas at room temperature. A cold gas damper (second blower section) 30d is provided on the downstream side of the cold gas flow path 30b. The opening degree of the cold gas damper 30d is controlled by the control unit 51. 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.

[0033] In this embodiment, the flow rate of the primary air is the total flow rate of the hot gas supplied from the hot gas flow path 30a and the cold gas supplied from the cold gas flow path 30b. The temperature of the primary air is determined by the respective temperatures and mixing ratios 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 51. Also, a part of the combustion gas discharged from the boiler 200 may be introduced into the hot gas supplied from the hot gas flow path 30a through a gas recirculation blower (not shown) to form a mixture, thereby adjusting the oxygen concentration of the primary air blown from the primary air flow path 100a into the interior of the housing 11.

[0034] In this embodiment, the state detection unit 40 of the mill 10 transmits the measured or detected data to the control device 50. The state detection unit 40 of this embodiment is, for example, differential pressure measurement means, and measures the differential pressure between the pressure at the portion where primary air flows into the inside of the housing 11 from the primary air flow path 100a and the pressure at the outlet port 19 where primary air and pulverized fuel are discharged from the inside of the housing 11 to the pulverized fuel supply flow path 100b as the differential pressure of the mill 10. The increase or decrease in the differential pressure of this 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 and the vicinity of the grinding table 12 inside the housing 11 due to the classification effect of the rotary classifier 16. That is, by adjusting the rotational speed of the rotary classifier 16 according to the differential pressure of this mill 10, the amount of pulverized fuel discharged from the outlet port 19 can be adjusted with respect to the supply amount of the solid fuel supplied to the mill 10. Therefore, within a range where the particle size of the pulverized fuel does not affect the combustibility of the burner 220, an amount of pulverized fuel 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. Further, the state detection unit 40 of this embodiment is, for example, temperature measurement means, and detects the temperature of the primary air supplied into the inside of the housing 11 (the primary air temperature at the mill inlet) and the temperature of the primary air from the space above the grinding table 12 inside the housing 11 to the outlet port 19, and controls the blower unit 30 so as not to exceed the upper limit temperature. The upper limit temperature is determined in consideration of the possibility of ignition of the solid fuel and the like. Note that the primary air is cooled by transporting while drying the pulverized fuel inside the housing 11, and the temperature of the primary air at the outlet port 19 is, for example, about 60 to 90 degrees.

[0035] The control device 50 performs various processes such as control of the solid fuel pulverizing device 100. For this reason, the control device 50 includes a control unit 51 and an arithmetic unit 52.

[0036] The control unit 51 is a device that controls each part of the solid fuel pulverizer 100. The control device 50 may, for example, transmit a drive instruction to the mill motor 15 to control the rotation speed of the pulverizing table 12. The control device 50 may, for example, transmit a drive instruction to the classifier motor 18 to control the rotation speed of the rotary classifier 16, adjust the classification performance, and optimize the differential pressure of the mill 10, that is, the circulation amount of the pulverized fuel inside the mill 10 within a predetermined range, so as to stably supply the fine powder fuel to the burner 220. Further, the control device 50 can adjust the supply amount (coal feeding amount) of the solid fuel that the conveying unit 22 conveys and supplies to the fuel supply unit 17 by, for example, transmitting a drive instruction to the coal feeder motor 23 of the coal feeder 20. Further, the control device 50 can control the opening degrees of the hot gas damper 30c and the cold gas damper 30d by transmitting an opening degree instruction to the blower unit 30, thereby adjusting the flow rate and temperature of the primary air. Specifically, the control device 50 controls the opening degrees of the hot gas damper 30c and the cold gas damper 30d so that the flow rate of the primary air supplied into the housing 11 and the temperature of the primary air at the outlet port 19 become predetermined values set corresponding to the coal feeding amount for each type of solid fuel.

[0037] The calculation unit 52 calculates the wear amount of the roller 13 based on the measurement results of a distance measuring sensor described later. Details will be described later. Note that the function of the calculation unit 52 may be provided in a device (control device) different from the monitoring unit 101 described later as in this embodiment, or may be provided in the monitoring unit 101 (distance measuring sensor).

[0038] FIG. 4 is a diagram showing an example of the hardware configuration of the control device 50 according to this embodiment. As shown in FIG. 4, the control device 50 is a computer system, and includes, for example, a CPU 1100, a ROM (Read Only Memory) 1200 for storing programs and the like executed by the CPU 1100, a RAM (Random Access Memory) 1300 that functions as a work area during execution of each program, a hard disk drive (HDD) 1400 as a mass storage device, and a communication unit 1500 for connecting to a network or the like. Note that a solid state drive (SSD) may be used as the mass storage device. These components are connected via a bus 1800.

[0039] Further, the control device 50 may include an input unit composed of a keyboard, a mouse, etc., and a display unit composed of a liquid crystal display device for displaying data, etc.

[0040] Note that the storage medium for storing programs and the like executed by the CPU 1100 is not limited to the ROM 1200. For example, other auxiliary storage devices such as magnetic disks, magneto-optical disks, and semiconductor memories may be used.

[0041] A series of processes for realizing various functions described later are recorded in the hard disk drive 1400 or the like in the form of a program. The CPU 1100 reads this program into the RAM 1300 or the like and executes information processing and arithmetic processing, whereby various functions described later are realized. Note that the program may be in a form pre-installed in the ROM 1200 or other storage media, a form provided in a state stored in a computer-readable storage medium, a form distributed via wired or wireless communication means, etc. A computer-readable storage medium is a magnetic disk, a magneto-optical disk, a CD-ROM, a DVD-ROM, a semiconductor memory, or the like.

[0042] Next, a boiler 200 that generates steam by burning using the fine fuel supplied from the solid fuel pulverizer 100 will be described. The boiler 200 includes a furnace 210 and a burner 220.

[0043] The burner 220 is a device that forms a flame by burning pulverized fuel using primary air containing the pulverized fuel supplied from the pulverized fuel supply passage 100b and secondary air supplied by heating the air (outside air) sent from the forced draft fan (FDF) 32 with the heat exchanger 34. The combustion of the pulverized fuel is carried out in the furnace 210, and the high-temperature combustion gas is discharged to the outside of the boiler 200 after passing through heat exchangers (not shown) such as an evaporator, a superheater, and a economizer.

[0044] The combustion gas discharged from the boiler 200 is subjected to predetermined treatment by an environmental device (not shown such as a denitration device and an electrostatic precipitator), and heat exchange is performed between the air sent from the primary air blower 31 and the air sent from the forced draft fan 32 by a heat exchanger 34 such as an air preheater, and is led to a chimney (not shown) via the induced draft fan (IDF) 33 and discharged to the outside air. The air sent from the primary air blower 31 heated by the combustion gas in the heat exchanger 34 is supplied to the hot gas passage 30a described above. The water supply to each heat exchanger of the boiler 200 is heated in an economizer (not shown), and then further heated by an evaporator (not shown) and a superheater (not shown) to generate high-temperature and high-pressure steam, which is sent to a steam turbine (not shown) that is a power generation unit to rotationally drive the steam turbine, and a generator (not shown) connected to the steam turbine is rotationally driven to generate electricity, thereby constituting the power generation plant 1.

[0045] Next, the roller 13 will be described in detail with reference to FIGS. 1 to 3. The roller 13 is supported by the housing 11 so as to be rotatable about the central axis C2 via a journal shaft 46, a journal head 45, and a support shaft 48. As shown in FIG. 3, the roller 13 includes a journal housing 63 rotatably supported at the tip of a journal shaft 46 (or simply a shaft), and a substantially annular roller portion 64 externally fitted to the journal housing 63. The journal housing 63 is provided so as to cover the tip of the journal shaft 46, and its outer peripheral surface is formed in a cylindrical shape.

[0046] The roller portion 64 is formed in a substantially annular shape. Further, the roller portion 64 is fitted to the journal housing 63 such that its inner peripheral surface contacts the outer peripheral surface of the journal housing 63. When the pulverizing table 12 rotates with the outer peripheral surface of the roller portion 64 in contact with the solid fuel placed on the upper surface of the pulverizing table 12, the roller 13 can be carried around by receiving a rotational force from the pulverizing table 12. Also, the solid fuel is pulverized by being sandwiched between the upper surface of the pulverizing table 12 and the outer peripheral surface of the roller portion 64. The roller portion 64 is pressed against the pulverizing table 12 by a pressing device 49, and stable pulverization of the solid fuel can be achieved by adjusting the pressing force (for example, hydraulic load) according to the amount and properties (ease of pulverization) of the supplied solid fuel.

[0047] The dashed line L1 in Fig. 3 shows the wear progress pattern of the roller part 64 in the initial stage of wear. That is, in Fig. 3, in the initial stage, as an example, a situation is shown where a part P1 on the base end side (i.e., the side opposite to the tip end side) of the outer peripheral surface of the roller part 64 wears more significantly than other parts. Here, the base end side indicates the outer peripheral side in the radial direction of the pulverizing table 12, and the tip end side indicates the side of the central axis C1 of the pulverizing table 12. Also, the two-dot chain line L2 in Fig. 3 shows the wear progress pattern of the roller part 64 in the final stage of wear. In the final stage, the outer peripheral surface of the roller part 64 wears and spreads around P1, and an example is shown where the area facing the pulverizing table 12 wears substantially uniformly as a whole. Similarly, the dashed line L3 in Fig. 3 shows the wear progress pattern of the table liner 12a in the initial stage of wear, and the two-dot chain line L4 shows the wear progress pattern of the table liner 12a in the final stage of wear. Note that although P1 is described as an example where the base end side of the roller part 64 wears more significantly than other parts, it is not limited to the base end side of the roller part 64. P1 varies on the outer peripheral surface of the roller part 64 depending on the specifications of the mill 10, operating conditions, etc.

[0048] Next, the monitoring of the wear state of the roller 13 (roller part 64) will be described. Fig. 5 is a diagram showing a specific configuration example including the monitoring mechanism around the roller 13. Further, Fig. 6 shows a plan view of a specific configuration example (part) around the monitoring unit 101 in Fig. 5, and Fig. 7 shows a detailed view of a specific configuration example (part) around the monitoring unit 101 in Fig. 5. As described above, the solid fuel pulverizing device 100 is provided with a pulverizing table 12, a journal head 45, a monitoring unit 101, and a control device 50. The roller 13 presses and pulverizes the solid fuel placed on the pulverizing table 12. The roller 13 is supported by the journal head 45, and the roller 13 and the journal head 45 swing and displace integrally. Integrally swinging means that the roller 13 and the journal head 45 move integrally around the central axis C2.

[0049] The monitoring unit 101 is fixedly provided on the journal head 45, and monitors the wear state of the outer surface of the roller portion 64 of the roller 13. Specifically, as shown in FIG. 5, the monitoring unit 101 is connected to the journal head 45 via a support 103. By fixing the monitoring unit 101 and the journal head 45 with the support 103 as a fixing jig, even if the roller 13 swings and displaces during operation, the distance between the distance measuring sensor described later and the axis of the roller 13 can be kept constant. That is, the influence of the swing and displacement of the roller 13 can be suppressed, and the wear amount of the roller 13 can be measured. The installation structure of the monitoring unit 101 is preferably installed so as to increase the rigidity and prevent the distance between the distance measuring sensor and the axis of the roller 13 from changing even due to some vibration.

[0050] The information monitored (measured) by the monitoring unit 101 is output to the control device 50 via the cable 104. The cable 104 is taken out of the housing 11. The power cable supplied to each distance measuring sensor (described later) of the monitoring unit 101 is laid in the same way. Since the monitoring unit 101 swings together with the roller 13, it displaces with respect to the fixed housing 11. Therefore, the cable 104 may be provided with a flexible portion for absorbing this displacement. Further, a protective tube 105 for protecting the cable 104 may be provided, and the cable 104 may be drawn out from the monitoring unit 101 through the inside of the protective tube 105. The protective tube 105 may be provided with a flexible portion (for example, a bellows tube). The signal transmission and power supply are not limited to the wired method, and may be a wireless method.

[0051] The monitoring unit 101 is configured by using a plurality of distance measuring sensors that measure the distance to the outer surface of the roller portion 64. Specifically, the distance measuring sensors are attached to the housing constituting the monitoring unit 101. The distance measuring sensor (hereinafter referred to as "sensor S") is a sensor S that measures the distance to an object. In the configuration illustrated in FIGS. 5, 6, and 7, the case where 10 sensors S (two rows of 5 sensor groups) are provided is described as an example, but the number of installed sensors S is not limited.

[0052] The sensor S is of the eddy current type or the ultrasonic type. By being of the eddy current type or the ultrasonic type, it is possible to suppress the influence of dust and perform highly accurate distance measurement even in an environment of a high-concentration dust atmosphere where pulverized fuel floats, and the wear state can be monitored. However, the type of the sensor S is not limited to the above. For example, as a distance measurement sensor, in addition to the radio wave type and the optical type, it is also possible to use a method such as an air gap type that measures the gap from the change in back pressure when high-pressure air is blown.

[0053] FIG. 8 is a diagram for explaining the measurement principle of the ultrasonic type sensor S. In the ultrasonic type, a sound wave (transmission wave) generated from an internal piezoelectric element or MEMS (Micro Electro Mechanical Systems; a device in which a minute electronic circuit and mechanical elements are integrated on one substrate) is transmitted to an object. Then, the time (ToF) until it is reflected from the object (reflected wave) and returns to the sensor S again is measured. And the distance L is calculated from the speed of sound and the ToF. Since sound waves are used, it has features such as being less affected by dust in the path and dirt on the sensor S, and being able to detect non-metal structures.

[0054] FIG. 9 is a diagram for explaining the measurement principle of the eddy current type sensor S. The eddy current type sensor S is oscillated by applying a specific high frequency to an internal coil, generating a high-frequency magnetic field around the sensor S. When metal exists in front of the coil, eddy currents are excited on the metal surface by the high-frequency magnetic field. Note that it is not limited to metal and may be a conductor. The current amplitude (oscillation amplitude) flowing through the coil inside the sensor S changes depending on the magnitude of the eddy currents excited in the metal (eddy current loss). The magnitude of the eddy currents depends on the distance between the sensor S and the metal, being larger when closer (the oscillation amplitude on the sensor S side is smaller) and smaller when farther (the oscillation amplitude on the sensor S side is larger). Therefore, by rectifying and outputting this signal, the distance between the sensor S and the metal can be calculated. The eddy current type is characterized by high heat resistance and excellent resolution.

[0055] In this way, the sensor S fixed outside the roller 13 measures the distance between the sensor S and the outer surface of the roller 13 (roller part 64). Each sensor S measures a preset area on the outer surface of the roller part 64 as the measurement target. Then, the calculation unit 52 converts the measured distance into the wear amount. The measurement is more preferably performed continuously. For example, when the mill 10 is installed or the monitoring unit 101 is installed, etc., the distance between the sensor S and the outer surface of the roller part 64 in a state where there is no wear on the roller part 64 is measured and used as the reference distance. Then, the distance between the sensor S and the outer surface of the roller part 64 is measured in a state where wear has progressed due to the use of the roller 13, and this is used as the measured distance. Then, based on the difference between the reference distance and the measured distance, the wear amount of the roller 13 (roller part 64) is calculated.

[0056] Furthermore, since the roller 13 rotates during operation, even if the sensor S is fixed, it is possible to monitor the wear state in the circumferential direction of the roller 13 (roller part 64). That is, by synchronizing the distance measurement data with the rotation of the roller 13, it is possible to identify which position on the outer surface in the circumferential direction of the roller part 64 is the measurement target for the fixed sensor S (that is, which part in the circumferential direction of the roller part 64 is closest to the sensor S). Therefore, the wear state of the outer surface in the circumferential direction of the roller part 64 can be monitored. For example, it can be synchronized with the rotation of the roller 13 based on the rotation speed of the roller 13 (the number of rotations per unit time). In addition, in this embodiment, the case where the monitoring unit 101 is fixed is described, but the monitoring unit 101 may be configured to be movable in the circumferential direction of the roller part 64.

[0057] As shown in Fig. 5, the monitoring unit 101 is provided with a protector 102 for the falling solid fuel. Inside the mill 10, the solid fuel supplied from the fuel supply unit 17, the coarse powder fuel classified by the classifier and returned to the grinding table 12, etc. fall vertically downward. Therefore, it is preferable to provide the protector 102 above the monitoring unit 101. That is, when viewed from above, the monitoring unit 101 is covered by the protector 102. Thereby, it becomes possible to protect the monitoring unit 101 from the falling solid fuel etc. The protector 102 is preferably multi-point supported in order to cope with the collision of the solid fuel etc. For example, as shown in Fig. 5, the protector 102 is preferably supported by a support member from the upper part of the monitoring unit 101, a support member from the side surface of the monitoring unit 101, and a support member from the support 103.

[0058] In addition, when the protector 102 can be dispensed with, etc., the monitoring unit 101 may have a structure in which the upper surface in the vertical direction is inclined with respect to the horizontal direction. For example, as shown in Fig. 10, the upper surface of the monitoring unit 101 is inclined (inclined surface 106), and it is possible to prevent solid fuel etc. from accumulating on the monitoring unit 101. It is also possible to incline the upper surface of the support 103 and the protector 102.

[0059] Next, the arrangement of the sensor S will be described. As shown in Fig. 5 for example, a plurality of sensors S are provided in the axial direction of the roller 13. Thereby, a plurality of regions on the outer surface of the roller part 64 in the axial direction can be measured.

[0060] Furthermore, in the monitoring unit 101, a set of sensors S (hereinafter referred to as "sensor group") is also provided in the circumferential direction of the roller part 64. Specifically, a plurality of sensors S arranged in the rotation axis direction (axial direction) of the roller 13 are taken as one set of sensor groups. And a plurality of these sensor groups are arranged in the circumferential direction of the roller part 64. In the present embodiment, as shown in Fig. 6, the case where five sensors S are included in the sensor group and two rows of these sensor groups are provided will be described as an example. Note that the sensors included in the sensor group number It is not limited, nor is it limited with respect to the number of columns. The number of columns may be one column.

[0061] And the sensors S adjacent to each other in the circumferential direction of the roller portion 64 have the same position in the rotational axis direction of the roller 13. That is, by providing a plurality of rows of sensor groups, the sensors S are arranged in a checkerboard pattern. Since the roller 13 rotates in the circumferential direction, by arranging a plurality of rows of sensor groups, redundancy can be improved. For example, even if some of the sensors S fail, the wear state at the same position in the axial direction can be monitored by the sensors S of the sensor groups in other rows. By adding redundancy, the measurements of the plurality of sensors S can be multiplexed, and it is also possible to complement with other sensors S when an abnormal signal such as disturbance enters a certain sensor S. When multiplexed, if the difference in the measurement results at the same axial position exceeds a threshold value, it may be determined that an abnormality has occurred.

[0062] In FIG. 6, the case where the sensors S are arranged in a checkerboard pattern is illustrated, but as shown in FIG. 11, the sensors S may be arranged in a staggered pattern. Specifically, a plurality of sensor groups are arranged in the circumferential direction of the roller portion 64, and the sensors S adjacent to each other in the circumferential direction have different positions in the rotational axis direction. FIG. 11 illustrates the case of three rows. In this way, since the positions of the sensors S in the sensor groups adjacent in the axial direction are different, the number of measurement points in the axial direction increases, and the outer surface can be monitored in more detail.

[0063] Note that it is also possible to combine the checkerboard pattern and the staggered pattern of sensor arrangements.

[0064] Next, the cleaning of the roller 13 will be described. Since the roller 13 is pulverizing solid fuel, there may be deposits adhering to the roller 13 (roller section 64). For this reason, as shown in FIG. 12, a cleaning section 107 for cleaning the deposits on the roller section 64 is provided upstream of the roller 13 in the rotational direction with respect to the monitoring section 101. By providing the cleaning section 107 upstream of the roller 13 in the rotational direction with respect to the monitoring section 101, it is possible to remove the deposits on the surface of the roller section 64 after pulverization and before measurement by the sensor S. As a result, it is possible to suppress the influence of the deposits and perform more accurate measurement by the sensor S.

[0065] The cleaning section 107 is configured using, for example, a brush. In this case, mechanical cleaning is performed by the brush. The brush may be fixed to the monitoring section 101 or the like and perform cleaning by the rotation of the roller 13, or the brush may be actively moved to perform cleaning. Since the brush or the like wears out, it may be designed so that the worn portion is fed automatically or manually. The cleaning method is not limited to a brush, and may be a spatula-shaped scraper, or cleaning may be performed by blowing a gas such as seal air or purge air.

[0066] Next, the installation position of the monitoring section 101 will be described. Since the roller 13 is pulverizing solid fuel, it is preferable to install the monitoring section 101 in consideration of the behavior of the solid fuel on the pulverizing table 12. The monitoring section 101 is arranged within a range of 90° or more and 315° or less with respect to the rotational direction of the roller 13, with the point where the roller section 64 and the pulverizing table 12 are closest being set as 0°. FIG. 13 is a diagram for explaining the installation range of the monitoring section 101. As shown in FIG. 13, at the point where the roller section 64 and the pulverizing table 12 are closest, solid fuel is pulverized, and this point is defined as the pulverizing point. Then, with respect to the rotational direction of the roller 13, the pulverizing point is set as 0°.

[0067] Then, since the range from -45° (i.e., 315°) to 90° including the pulverization point is close to the pulverization point, solid fuel or the like may bounce off the pulverization table 12. Therefore, the monitoring unit 101 (i.e., the structure constituting the monitoring unit 101) is preferably installed within the range of 90° or more and 315° or less. Thereby, it is possible to suppress damage to the monitoring unit 101 caused by the solid fuel that has bounced off during the pulverization of the solid fuel by the roller 13.

[0068] Next, an example of the wear monitoring process will be described with reference to FIG. 14. FIG. 14 is a flowchart showing an example of the procedure of the wear monitoring process according to the present embodiment. The flow shown in FIG. 14 is repeatedly executed at a predetermined control cycle, for example, when the solid fuel pulverizer 100 is operating. The flow in FIG. 14 may also be started when a start instruction is given manually by an operator or the like.

[0069] First, each sensor S provided in the monitoring unit 101 measures the distance from the sensor S to the outer surface of the roller 13 (roller unit 64) (S101). A plurality of sensors S provided in the axial direction of the rotation axis of the roller 13 perform measurements at different positions in the axial direction on the outer surface of the roller unit 64.

[0070] Next, based on the measurement results of each sensor S, the wear amount of the roller 13 (roller unit 64) is derived (S102). Thereby, the wear amounts at a plurality of different positions in the axial direction on the outer surface of the roller unit 64 are obtained.

[0071] Although the wear amount is derived in this way, by executing the above flow (at least S101) at different times, it is possible to monitor the wear amount also on the outer surface in the circumferential direction of the roller unit 64.

[0072] The measured wear amount is, for example, analyzed for the time transition of the wear amount and used for estimating the progress of wear of the roller 13 (roller unit 64) and the replacement time.

[0073] As described above, according to the solid fuel pulverizing apparatus, power generation plant, and roller wear amount monitoring method according to the present embodiment, a monitoring unit 101 for monitoring the wear state of the roller 13 (roller portion 64) is fixedly provided on the journal head 45 that supports the roller 13 and swings integrally with the roller 13. Thereby, it is possible to suppress a change in the distance between the outer surface of the roller 13 (roller portion 64) and the monitoring unit 101. For this reason, it is possible to appropriately maintain the distance between the roller 13 (roller portion 64) and the monitoring unit 101, suppress fluctuations in the measurement origin of the distance, and improve the monitoring accuracy of the wear state. Even if the monitoring unit 101 fails, it can be replaced without removing the roller 13. Further, it can be applied to the small roller 13 used in the small mill 10.

[0074] Further, by basing on the rotation speed of the roller 13, it becomes possible to grasp the rotation state of the roller 13 and monitor the wear state of the outer surface in the circumferential direction of the roller 13 (roller portion 64). Further, the measured data may include noise due to electromagnetic noise on the sensor and wiring, deposits on the surface of the roller 13, and the like. By measuring the same location a plurality of times based on the rotation speed of the roller 13 and performing processing such as taking an average value, the influence of noise can be reduced.

[0075] Further, by providing a protector 102 for the solid fuel that falls on the monitoring unit 101, it is possible to suppress damage to the monitoring unit 101. Since the upper surface in the vertical direction of the monitoring unit 101 is inclined with respect to the horizontal direction, it is possible to suppress the deposition of solid fuel and the like on the monitoring unit 101.

[0076] A plurality of sensors S arranged in the rotation axis direction of the roller 13 are regarded as a set of sensor groups, and these sensor groups are arranged in a plurality in the circumferential direction of the roller 13 (roller portion 64). And the sensors S adjacent in the circumferential direction have the same position in the rotation axis direction. For this reason, each sensor S will be arranged in a checkerboard pattern. Since the roller 13 rotates in the circumferential direction, the redundancy can be improved by arranging the sensor groups in a plurality of rows.

[0077] A plurality of sensors S arranged in the rotational axis direction of the roller 13 are regarded as a set of sensor groups, and a plurality of these sensor groups are arranged in the circumferential direction of the roller 13 (roller section 64). And the sensors S adjacent in the circumferential direction are different in position in the rotational axis direction. For this reason, each sensor S is arranged, for example, in a staggered pattern. By being different in position in the rotational axis direction, the number of measurement points increases, and the outer surface can be monitored in more detail.

[0078] By providing a cleaning unit 107 for cleaning the deposits on the roller 13 (roller section 64) on the upstream side in the rotational direction of the roller 13, it becomes possible to further improve the monitoring accuracy.

[0079] Since the monitoring unit 101 is arranged within a range of 90° or more and 315° or less with respect to the rotational direction of the roller 13, with the point where the roller 13 (roller section 64) and the pulverizing table 12 are closest being set as 0°, it is possible to suppress damage to the monitoring unit 101 caused by the solid fuel that has bounced off during the pulverization of the solid fuel by the roller 13.

[0080] 〔Second Embodiment〕 Next, a solid fuel pulverizing apparatus, a power generation plant, and a roller wear amount monitoring method according to the second embodiment of the present disclosure will be described. In this embodiment, the case of introducing seal air will be described. Hereinafter, the solid fuel pulverizing apparatus, the power generation plant, and the roller wear amount monitoring method according to this embodiment will be mainly described with respect to the differences from the first embodiment.

[0081] The interior of the mill 10 is a dust atmosphere due to pulverized fuel. Therefore, there is a possibility that dust is swirling between the sensor S and the roller 13 (roller unit 64). For this reason, the monitoring unit 101 includes an input unit 108 that inputs gas (sealing air) between the monitoring unit 101 and the outer surface of the roller unit 64. FIG. 15 is a diagram showing an example of the input of sealing air. Note that, in this embodiment, the gas to be input is sealing air (air), but a gas having a lower dust concentration than the dust concentration inside the mill 10 can be used. By introducing the sealing air between the sensor S and the roller 13 (roller unit 64) (that is, within the measurement range of the sensor S), the concentration of the swirling dust can be reduced, and the measurement accuracy can be improved. Since the sealing air is at a lower temperature than the normal atmosphere, it also contributes to the cooling of the sensor S, and an improvement in the sensor life can be expected.

[0082] When introducing the sealing air, as shown in FIG. 15, a surrounding member 109 may be provided. The surrounding member 109 is configured to surround the space between the roller unit 64 and the sensor S that includes the input range of the sealing air and the measurement range of the sensor S. The surrounding member 109 has a predetermined gap from the roller unit 64, and the sealing air introduced through this gap escapes to the outside. For this reason, the dust concentration in the range surrounded by the surrounding member 109 is kept low by the sealing air. Further, by providing the surrounding member 109, the consumption amount of the sealing air can be reduced due to the chamber effect.

[0083] As described above, according to the solid fuel pulverizing apparatus, power generation plant, and roller wear amount monitoring method according to the present embodiment, gas is introduced between the monitoring unit 101 and the outer surface of the roller 13 (roller unit 64). Thereby, even if the interior of the solid fuel pulverizing apparatus 100 is a dust atmosphere, gas is supplied between the monitoring unit 101 and the outer surface of the roller unit 64, and the measurement accuracy can be improved.

[0084] 〔Third Embodiment〕 Next, a solid fuel pulverizing apparatus, a power generation plant, and a roller wear amount monitoring method according to the third embodiment of the present disclosure will be described. In this embodiment, the case where the position adjustment mechanism 110 in the monitoring unit 101 is provided will be described. Hereinafter, the solid fuel pulverizing apparatus, power generation plant, and roller wear amount monitoring method according to this embodiment will be mainly described with respect to the differences from the first and second embodiments.

[0085] The measurable range (measurable scope) of the sensor S is determined by the measurement method and specifications of the sensor S. However, as the roller 13 (roller unit 64) wears, the surface of the roller unit 64 gradually moves away from the sensor S. Therefore, depending on the degree of wear progress, it may exceed the measurable range of the sensor S and measurement may become impossible. Thus, in this embodiment, the position adjustment mechanism 110 related to the monitoring unit 101 is provided.

[0086] Specifically, the monitoring unit 101 is provided with a position adjustment mechanism 110 that enables position adjustment in the radial direction of the roller unit 64. FIG. 16 is a diagram showing an example of the position adjustment mechanism 110 in the monitoring unit 101. That is, the position adjustment mechanism 110 of the monitoring unit 101 is provided at the connection portion between the support 103 and the monitoring unit 101. For example, bolt holes or the like are provided so that the monitoring unit 101 can be position-adjusted in the radial direction of the roller unit 64 with respect to the support 103. When wear progresses, the monitoring can be continued by bringing the monitoring unit 101 closer to the roller unit 64 by the position adjustment mechanism 110. In the case of bolt holes, they may be formed as long holes to enable free position adjustment.

[0087] The configuration of the position adjustment mechanism 110 is not limited to the above. That is, as long as it is a configuration that enables position adjustment in the radial direction of the roller unit 64, bolts hole It is not limited to the above. Also, it may be manually adjusted in position, or it may be automatically adjusted by detecting that the wear amount detected by one or a plurality of sensors S exceeds the measurement range or a predetermined value. At this time, the position adjustment amount is adjusted so as to be equal to or less than the wear amount of the sensor S with the smallest wear amount among the sensors S provided in the corresponding monitoring unit 101, thereby preventing contact between the roller 13 and the monitoring unit 101. Therefore, it is preferable that the drive device be driven by a hydraulic cylinder, an electric motor, or the like that can be positioned and held at an arbitrary position analogously.

[0088] The adjustable amount (movement amount) of the position adjustment mechanism 110 is set based on the measurable range of the sensor S and the maximum wear amount of the roller 13 (roller portion 64). Specifically, it is preferable that the adjustable amount from the initial position be a distance equal to or greater than the distance obtained by subtracting the maximum measurable range of the sensor S from the distance from the initial position of the sensor S to the outer surface when the roller portion 64 is maximally worn. The initial position is, for example, the position where the monitoring unit 101 is farthest from the roller portion 64 in the position adjustment mechanism 110.

[0089] By providing the position adjustment mechanism 110 as shown in FIG. 16, it becomes possible to perform position adjustment of the entire monitoring unit 101.

[0090] On the other hand, it is also possible to provide a position adjustment mechanism 111 individually for each sensor S. Specifically, the monitoring unit 101 is provided with a position adjustment mechanism 111 that enables position adjustment of each sensor S in the radial direction of the roller portion 64. FIG. 17 is a diagram showing an example of the position adjustment mechanism 111 for each sensor S. That is, for example, nuts 112 or the like are provided so that each sensor S can be adjusted in position in the radial direction of the roller portion 64. That is, the sensor S has a cylindrical shape, and a spiral groove is formed along the cylindrical surface, and is fixed by two nuts 112 with the side wall of the housing of the monitoring unit 101 sandwiched therebetween. By loosening the nut 112, each sensor S can be adjusted in position in the vertical direction. When wear progresses, monitoring can be continued by bringing each sensor S closer to the roller portion 64 by the position adjustment mechanism 111.

[0091] The configuration of the position adjustment mechanism 111 of each sensor S is not limited to the above. That is, as long as the configuration enables position adjustment in the radial direction of the roller part 64, it is not limited to the method using a nut 112 or the like. Also, the position may be adjusted manually, or it may be automatically adjusted by detecting that the wear amount detected by the corresponding sensor S exceeds the measurement range or a predetermined value. At this time, since the position adjustment of the sensor S does not affect other sensors S, positioning at an arbitrary position is not necessary. On the other hand, since it is necessary to provide a position adjustment mechanism 111 for each of the plurality of sensors S, it is preferably driven by a pneumatic micro cylinder, a solenoid, a piezoelectric motor, etc. that can be manufactured in a small size.

[0092] The adjustable amount (movement amount) by the position adjustment mechanism 111 is set in the same manner as the position adjustment mechanism 110 of the monitoring unit 101. Note that the priority order during position adjustment implementation is to first perform position adjustment of the entire monitoring unit 101 by the position adjustment mechanism 110, and then perform position adjustment of each sensor S by the position adjustment mechanism 111.

[0093] These position adjustment mechanisms 110 and 111 more preferably include a stopper that can be fixed so that their positions do not easily change due to vibration or thermal expansion. Also, when performing position adjustment manually, since it is carried out at the stop timing of the solid fuel pulverizing device 100, it is preferably combined with a sensor S having a measurement range longer than the wear amount of the roller part 64 expected during the stop interval.

[0094] When position adjustment is performed, the distance from the sensor S after position adjustment to the outer surface of the roller part 64 is added to the position adjustment amount from the initial position, thereby deriving the distance from the sensor S at the initial position to the outer surface of the roller part 64. Thereby, even when position adjustment is performed, the wear amount of the roller 13 (roller part 64) can be calculated. For this reason, it is also possible to provide a scale or the like on the position adjustment mechanisms 110 and 111 so that the position adjustment amount from the initial position can be confirmed.

[0095] In addition, when position adjustment is performed, calibration may be performed so that the wear amount generated after the position adjustment is measured from the sensor S after the position adjustment. In this case, the total wear amount can be calculated by adding the additional wear amount (measurement result) to the wear amount (cumulative wear amount) until immediately before the position adjustment.

[0096] When the roller 13 is replaced with a new one, the sensor position is adjusted to a location where it can be measured again (for example, the initial position).

[0097] As described above, according to the solid fuel pulverizing device, power generation plant, and roller wear amount monitoring method according to the present embodiment, a position adjustment mechanism 110 that enables position adjustment in the radial direction of the roller 13 (roller unit 64) is provided, so that the position of the monitoring unit 101 with respect to the roller unit 64 can be adjusted. As a result, even if wear of the roller unit 64 progresses, it becomes possible to more reliably monitor the wear state by the monitoring unit 101.

[0098] By providing a position adjustment mechanism 111 that enables position adjustment of each sensor S with respect to the radial direction of the roller 13 (roller unit 64), the position of each sensor S with respect to the roller unit 64 can be adjusted. As a result, even if wear of the roller unit 64 progresses, it becomes possible to more reliably monitor the wear state by the monitoring unit 101. In particular, even if local wear progresses on the surface of the roller unit 64, the position of each sensor S can be adjusted, so that the position adjustment can be made more flexibly.

[0099] 〔Fourth Embodiment〕 Next, a solid fuel pulverizing device, a power generation plant, and a roller wear amount monitoring method according to the fourth embodiment of the present disclosure will be described. In this embodiment, a case where the measurement result by the sensor S is corrected will be described. Hereinafter, the solid fuel pulverizing device, the power generation plant, and the roller wear amount monitoring method according to the present embodiment will be mainly described with respect to the differences from the first embodiment, the second embodiment, and the third embodiment.

[0100] Since the monitoring unit 101 is fixed to the journal head 45 that swings integrally with the roller 13, the distance between the roller 13 (roller unit 64) and the monitoring unit 101 is ideally kept constant. However, in reality, since the members are not rigid bodies but elastic bodies, for example, when foreign matter mixed in the fuel during the pulverization of solid fuel is bitten in and an excessive displacement acceleration occurs, the position of the monitoring unit 101 may fluctuate temporarily with respect to the roller unit 64. In such a case, since it affects the distance measured by the sensor S, correction is performed in this embodiment.

[0101] Specifically, the monitoring unit 101 includes an auxiliary distance measuring sensor (auxiliary sensor Sa) and a correction unit 56. The auxiliary sensor Sa measures the distance to a portion that does not wear due to the pulverization of the solid fuel that rotates together with the roller unit 64. The portion that does not wear due to the pulverization of the solid fuel that rotates together with the roller unit 64 is, for example, the wheel portion 113 of the roller unit 64. In this embodiment, this portion is described as the wheel portion 113, but it is not limited to the wheel portion 113 as long as it is a portion that does not wear due to the pulverization of the solid fuel that rotates together with the roller unit 64. However, this portion needs to be integral with or rigidly coupled to the roller unit 64 that is the measurement target, and it is necessary that the displacement due to elastic deformation with the roller unit 64 is small even when an excessive acceleration occurs. FIG. 18 is a diagram showing an installation example of the auxiliary sensor Sa. The auxiliary sensor Sa is provided in the monitoring unit 101 and measures the distance to the wheel portion 113 where wear does not occur.

[0102] The correction unit 56 corrects the measurement results of each sensor S based on the measurement results of the auxiliary sensor Sa. Specifically, when the mill 10 is newly installed or the auxiliary sensor Sa is installed, the distance (auxiliary reference distance) between the auxiliary sensor Sa and the wheel portion 113 is measured in advance. During operation, when referring to the measurement results of the auxiliary sensor Sa, if the measurement result is equal to the auxiliary reference distance (if the measurement result is within the range of the auxiliary reference distance ± a predetermined distance), the measurement results of the sensor S are not corrected. On the other hand, during operation, when referring to the measurement results of the auxiliary sensor Sa, if the measurement result is not equal to the auxiliary reference distance (if the measurement result is not within the range of the auxiliary reference distance ± a predetermined distance), the measurement results of the sensor S are corrected. Specifically, the value obtained by subtracting the auxiliary reference distance from the measurement result of the auxiliary sensor Sa is added to the measurement results of each sensor S. This makes it possible to derive the wear amount in consideration of the distance variation between the short-term monitoring unit 101 and the roller unit 64. Note that the correction method is not limited to the above as long as it takes the auxiliary reference distance into consideration.

[0103] As described above, according to the solid fuel pulverizing apparatus, power generation plant, and roller wear amount monitoring method according to the present embodiment, this short-term positional variation can be grasped. Therefore, based on the measurement results of the auxiliary sensor Sa, by correcting the measurement results of each sensor S, it becomes possible to perform measurement by the sensor S while taking into account the positional variation of the roller 13 with respect to the short-term journal head 45.

[0104] 〔Fifth Embodiment〕 Next, a solid fuel pulverizing apparatus, a power generation plant, and a roller wear amount monitoring method according to the fifth embodiment of the present disclosure will be described. Hereinafter, the solid fuel pulverizing apparatus, the power generation plant, and the roller wear amount monitoring method according to the present embodiment will be mainly described with respect to the differences from the first embodiment, the second embodiment, the third embodiment, and the fourth embodiment.

[0105] The control device 50 estimates the remaining life of the roller 13 (roller unit 64). That is, the control device 50 functions as a remaining life estimation system for the roller unit 64 that crushes solid fuel with the crushing table 12. Note that the function as a remaining life estimation system may be provided in a device separate from the control device 50.

[0106] FIG. 19 is a functional block diagram showing the functions related to the remaining life estimation provided in the control device 50. As shown in FIG. 19, the control device 50 includes an estimation unit 53, a prediction unit 54, and a planning unit 55.

[0107] The estimation unit 53 estimates the remaining life of the roller 13 (roller unit 64) based on wear information (information regarding the wear amount of the roller unit 64 monitored by the monitoring unit 101). Note that the remaining life may be estimated by the control device 50, or the driver or monitor may separately create a graph of the wear progress situation or the like to estimate the time until the end of the life. Further, the control device 50 may display the estimated remaining life on a display unit such as a display.

[0108] The prediction unit 54 predicts the future transition of the remaining life from the transition of the remaining life estimated by the estimation unit 53 based on a database in which the operating state of the solid fuel pulverizer 100 and the remaining life transition characteristics corresponding to the operating state are accumulated in advance, and a database accumulated in the current operation. Remaining life transition The characteristic is information indicating the characteristic of the remaining life that changes depending on the operating state, and specifically, it is a curve characteristic (which may be a straight line) as shown in a, b, and c of FIG. 20. That is, the database stores the past and current operating information of the solid fuel pulverizer 100. The database may store the past operation data of the solid fuel pulverizer 100 for which the remaining life is to be estimated, or may store the past operation data of other solid fuel pulverizers 100 with similar configurations. Also, not only the actual operation data but also the virtually simulated data may be stored in the database. The database may be provided in the control device 50 (storage unit), or may be provided in a separate device. The operating state includes at least any one of the type of solid fuel (coal type information, fuel type information, etc.), the supply amount of solid fuel (coal supply amount), the hydraulic load on the roller 13 (the pressing force of the roller 13 against the pulverizing table 12), the cumulative operating time of the solid fuel pulverizer 100, and the operating load of the solid fuel pulverizer 100. Note that the operating state is not limited to the above and can include any parameter that affects the life of the roller 13.

[0109] Specifically, the prediction unit 54 refers to the database, selects data of an operating state similar to the operating state of the solid fuel pulverizer 100 for which the remaining life is to be estimated, and selects and acquires the remaining life transition characteristics corresponding to the data of the similar operating state. The data of the similar operating state is data of an operating state that is estimated to have a similar remaining life influence degree with respect to the operating state of the solid fuel pulverizer 100 for which the remaining life is to be estimated. For example, when selecting using the type of solid fuel as the operating state, an operating state including a solid fuel for which it is assumed that the influence on the change in wear information (wear amount for each measurement position, etc.) with respect to the operating time is similar from the perspective of the remaining life influence degree with respect to the solid fuel of the solid fuel pulverizer 100 for which the remaining life is to be estimated is a similar operating state. Note that for each parameter of the operating state, a similarity judgment priority order may be set, and similarity judgment may be performed for the parameter with a higher priority order (for example, the type of solid fuel).

[0110] Figure 20 shows an example in which the remaining life transition characteristics in a similar operating state are selected for the roller 13 (roller section 64) of the solid fuel pulverizer 100 for which the remaining life is to be estimated. In Figure 20, examples in which characteristics a, b, and c are selected as the remaining life transition characteristics are shown. And in Figure 20, the estimated results E1 (first estimated result), E2 (second estimated result), En (nth estimated result) of the remaining life from the measurement information of the roller wall thickness carried out on the solid fuel pulverizer 100 for which the remaining life is to be estimated are shown.

[0111] The prediction unit 54 identifies the remaining life transition characteristic (a, b, c) having a roller wall thickness transition characteristic similar to the transition characteristic E of the estimated result of the remaining life carried out on the roller 13 (roller section 64) of the solid fuel pulverizer 100 for which the remaining life is to be estimated, from among the selected remaining life transition characteristics (a, b, c). In the example of Figure 20, since the transition characteristic from E1 to En from the measurement information of the roller wall thickness is similar to characteristic c, characteristic c is identified. For example, the determination of similarity may be made, for example, by determining whether or not the transition characteristic of the roller wall thickness (or wear amount) with respect to the cumulative time matches within a predetermined range. Whether or not it matches within a predetermined range may be, for example, a match within ±10% excluding the measurement information (roller wall thickness or wear amount) clearly determined to be extremely abnormal. by This may be the case, and more preferably, a match within ±5% may also be acceptable. When characteristic c is identified, it is estimated that the solid fuel pulverizer 100 for which the remaining life is to be estimated will have its remaining life characteristic transition in the future like characteristic c and reach the life end time Tb. By thus basing on the past database excluding the currently measured data, it is possible to predict the future remaining life transition taking into account the operating state of the solid fuel pulverizer 100, and thus it becomes possible to estimate the remaining life with higher accuracy. Regarding the transition characteristic E of the estimated result of the remaining life carried out on the roller 13 (roller section 64) of the solid fuel pulverizer 100 for which the remaining life is to be estimated, it may be the transition characteristic from the time of new installation of the mill 10 to the present, or the transition characteristic in a predetermined period from the present to the past, or the transition characteristic from the time when the operating state has changed significantly (for example, the type of solid fuel has changed) to the present.

[0112] Note that, as in the example of Fig. 20, even if the transition characteristics of the estimated remaining life of the roller 13 (roller section 64) implemented for the solid fuel pulverizer 100 whose remaining life is to be estimated do not exactly correspond to the selected remaining life transition characteristics, similar transition characteristics may be selected from the selected remaining life transition characteristics. Also, if there are no transition characteristics similar to the transition characteristics of the estimated remaining life implemented for the roller 13 (roller section 64) of the solid fuel pulverizer 100 whose remaining life is to be estimated among the selected remaining life transition characteristics in the past database, it may be possible to make a prediction based on the selected remaining life transition characteristics. For example, in Fig. 20, if the transition characteristics of the estimated remaining life of the roller 13 (roller section 64) of the solid fuel pulverizer 100 whose remaining life is to be estimated are located between characteristic a and characteristic b at a ratio of the difference from characteristic a side to the difference from characteristic b side, it may be possible to predict the future remaining life transition of the roller 13 (roller section 64) of the solid fuel pulverizer 100 whose remaining life is to be estimated based on characteristic a and characteristic b. In this case, for example, the intermediate line between characteristic a and characteristic b is generated at a ratio of the difference from characteristic a side to the difference from characteristic b side to perform the remaining life transition prediction.

[0113] Note that for the processing by the prediction unit 54 (selection of similar operating states in the database, selection of remaining life transition characteristics having transition characteristics similar to the transition characteristics of the estimated remaining life implemented for the roller 13 (roller section 64) of the solid fuel pulverizer 100 whose remaining life is to be estimated in the selected remaining life transition characteristics, and prediction of the future remaining life transition based on the selected remaining life transition characteristics), it may be processed with a preset algorithm, or it may be appropriately processed using AI.

[0114] Also, as shown in FIG. 21, for example, when operating by switching solid fuels A, B, and C, which are types (coal types) of solid fuel with different degrees of influence on the wear of the roller 13, the wear amount can be estimated from the measurement information of the roller wall thickness for each switching of the coal types, and the remaining life with respect to the cumulative operation time can be evaluated. Therefore, the replacement cycle of the roller 13 can be extended compared to the remaining life estimated based on the measurement results during the conventional internal inspection. That is, conventionally, based on the wear measurement results (wear amount) during internal inspection, when the wear progresses to approximately the same extent as before, the remaining life (wear limit) was predicted (see the broken line in the graph). In contrast, in this embodiment, since the wear amount of the roller wall thickness can be sequentially measured based on the cumulative operation time and the wear amount can be estimated for each switching of the coal types, the remaining life can be accurately predicted (see the dashed-dotted line in the graph of FIG. 21). Therefore, as shown in FIG. 21, compared to the conventional case, it becomes possible to use up the wall thickness of the roller 13 (roller part 64) by X minutes on the vertical axis of the graph. Also, the operation time until the replacement cycle of the roller 13 can be extended by Y minutes on the horizontal axis of the graph.

[0115] The planning unit 55 creates a maintenance plan based on the estimated remaining life transition characteristics. Specifically, since it is known at which future point in time the life will be reached based on the remaining life estimated by the estimation unit 53 and the remaining life estimated by the prediction unit 54, the planning unit 55 creates a maintenance plan. Since the remaining life transition characteristics can be estimated more accurately as described above, it becomes possible to plan with a margin for the life.

[0116] In the planning unit 55, for example, a maintenance plan is created a predetermined period before the estimated life reach time. The predetermined period is set based on the period required to perform maintenance safely and stably, such as the period from arranging the roller 13 to be maintained to the time required for replacement. is The maintenance plan is planned to include, for example, at least one of the maintenance time, the operation plan for adjusting the maintenance time, and the load sharing adjustment among the plurality of solid fuel pulverizing devices 100.

[0117] The maintenance timing is the time (recommended time) when the roller 13 should be replaced, which is set based on the estimated remaining life transition characteristics. The maintenance timing is set, for example, by taking into account a predetermined margin with respect to the estimated life reach time.

[0118] The operation plan for adjusting the maintenance timing is an operation plan for the solid fuel pulverizer 100 and is for adjusting the time until the maintenance timing. For example, when the maintenance timing has already been set and is after the estimated life reach time, an operation plan for extending the life is planned. Specifically, it is changing the type of solid fuel, relaxing the fineness, etc. By appropriately adjusting the operating state, it becomes possible to extend the life more safely and perform maintenance at an appropriate time. When the preset maintenance timing is before the estimated life reach time, it may be possible to plan an operation plan to increase the load (the amount of solid fuel for pulverization processing) of the solid fuel pulverizer 100.

[0119] The load sharing adjustment among multiple solid fuel pulverizers 100 is to appropriately adjust the load sharing among the solid fuel pulverizers 100 provided in multiple units in the power plant 1. For example, the load sharing of each solid fuel pulverizer 100 is planned to make the maintenance timings of the solid fuel pulverizers 100 in multiple units coincide, or to set the timings step by step (to make the maintenance intervals equal among the multiple solid fuel pulverizers 100). For example, when the estimated life reach time of one of the multiple solid fuel pulverizers 100 is earlier than that of the other solid fuel pulverizers 100, the load of the solid fuel pulverizer 100 can be relaxed and borne by the other solid fuel pulverizers 100, so as to adjust the life reach times of the multiple solid fuel pulverizers 100 to coincide.

[0120] FIG. 22 is an example of a system related to a maintenance plan. As shown in FIG. 22, on the user side, the remaining life estimation information of the solid fuel pulverizer 100 is aggregated in the information aggregation system 1010, and on the server 1020 of the device manufacturer side, the information aggregated in the aggregation system is acquired, a plan is made in the plan system 1030, and a proposal is made to the user. Note that FIG. 22 illustrates the case where the planning unit 55 is provided on the device manufacturer side as the planning system 1030, but it may be provided on the solid fuel pulverizer 100 side of the user.

[0121] As described above, according to the solid fuel pulverizer, power generation plant, and roller wear amount monitoring method according to the present embodiment, the remaining life of the roller 13 (roller unit 64) is estimated based on the wear amount of the roller 13 (roller unit 64). Therefore, it is possible to improve the estimation accuracy of the remaining life in response to fluctuations in the operating state of the solid fuel pulverizer 100 equipped with the roller 13. By more accurately estimating the remaining life, maintenance (replacement, etc.) of the roller 13 (roller unit 64) can be performed at a more appropriate timing. That is, since the roller 13 can be used for a longer time, the maintenance frequency can be reduced. For this reason, the maintenance cost can be reduced. In addition, the operating rate of the solid fuel pulverizer 100 can be improved.

[0122] Based on the database in which the operating state and the remaining life transition characteristics are associated, it is possible to predict the future remaining life transition from the remaining life transition estimated by the estimation unit 53. The future remaining life transition can be predicted more accurately, and maintenance (replacement, etc.) of the roller 13 can be performed at a more appropriate timing. That is, since the roller 13 can be used for a longer time, the maintenance frequency can be reduced. For this reason, the maintenance cost can be reduced. In addition, the operating rate of the solid fuel pulverizer 100 can be improved.

[0123] As an operating state, at least any one of information regarding the type of solid fuel, the cumulative operating time, and the operating load is used. Information regarding the type of solid fuel, the cumulative operating time, and the operating load are factors that affect the remaining life. Therefore, it is possible to effectively predict the future transition of the remaining life.

[0124] By creating a maintenance plan based on the estimated remaining life, it is possible to plan with a margin for the maintenance time. For this reason, the operating rate of the solid fuel pulverizer 100 can be improved. In the maintenance plan, for example, the maintenance time, an operation plan for adjusting the maintenance time (such as changing the type of solid fuel), load sharing adjustment among multiple fixed fuel pulverizers, etc. can be carried out.

[0125] The present disclosure is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the invention. It is also possible to combine each embodiment. That is, regarding the above-described first embodiment, second embodiment, third embodiment, fourth embodiment, and fifth embodiment, it is also possible to combine them respectively.

[0126] For example, the roller 13 (roller unit 64) and the pulverizing table 12 are adjusted to have a predetermined gap so as not to come into direct contact when no solid fuel is being fed. When adjusting this gap, first, the most convex portions of the roller unit 64 and the most convex portions of the pulverizing table 12 need to be found and aligned to have a predetermined gap. Since, as in each embodiment, the uneven state of the roller unit 64 can be monitored by the monitoring unit 101, the labor of finding the convex portions when adjusting the gap can be reduced. Although the monitoring unit 101 is provided for the roller 13 in each embodiment, by also providing the monitoring unit 101 for the pulverizing table 12, it is also possible to find the convex portions of the pulverizing table 12.

[0127] Once the uneven states of the roller part 64 and the pulverizing table 12 are grasped, gap adjustment may be performed during operation. Specifically, the wear amount of the most convex part of the roller part 64 and the wear amount of the most convex part of the table liner 12a are detected, and the roller gap is adjusted in the direction of decreasing by the total amount. The gap adjustment may be performed manually or automatically. As a method of adjustment, for example, a gap bolt (a mechanism for adjusting the gap between the roller 13 and the pulverizing table 12) may be rotated by a hydraulic motor to decrease the roller gap by a predetermined amount, or a scale may be engraved on the gap bolt, and when a predetermined wear amount is reached, the gap bolt may be moved by a predetermined scale amount.

[0128] Also, as the solid fuel, biomass fuel or PC (Petroleum Coke) fuel generated during petroleum refining may be used, and each solid fuel may be mixed and used. Also, the installation location of the monitoring unit 101 is not limited to the journal head 45, and may be another member integrally or rigidly coupled to the journal head 45. That is, as long as it is a member that swings and displaces integrally with the roller 13, it may be attached to, for example, the journal shaft 46, or another member may be sandwiched between the monitoring unit 101 and the journal head 45 for attachment.

[0129] The solid fuel pulverizing apparatus, power generation plant, and roller wear amount monitoring method described in each of the embodiments described above are understood, for example, as follows. The solid fuel pulverizing apparatus (100) according to the present disclosure includes a pulverizing table (12) on which solid fuel is placed, a pulverizing roller (13) that presses and pulverizes the solid fuel placed on the pulverizing table (12), a journal head (45) that supports the pulverizing roller (13) and swings and displaces integrally with the pulverizing roller (13), and a monitoring unit (101) that is fixedly provided on the journal head (45) and monitors the wear state of the outer surface of the pulverizing roller (13).

[0130] According to the solid fuel pulverizing apparatus (100) according to the present disclosure, a monitoring unit (101) for monitoring the wear state of the pulverizing roller (13) is fixedly provided on a journal head (45) that supports the pulverizing roller (13) and swings (displaces) integrally with the pulverizing roller (13). Thereby, it is possible to suppress a change in the distance between the outer surface of the pulverizing roller (13) and the monitoring unit (101). For this reason, it is possible to appropriately maintain the distance between the pulverizing roller (13) and the monitoring unit (101) and improve the monitoring accuracy of the wear state.

[0131] Further, since the monitoring unit (101) is fixed to the journal head (45) and the pulverizing roller (13) rotates, it is also possible to monitor the wear state in the circumferential direction of the pulverizing roller (13) by the monitoring unit (101).

[0132] In the solid fuel pulverizing apparatus (100) according to the present disclosure, the monitoring unit (101) may monitor the wear state of the outer surface in the circumferential direction of the pulverizing roller (13) based on the rotation speed of the pulverizing roller (13).

[0133] According to the solid fuel pulverizing apparatus (100) according to the present disclosure, by relying on the rotation speed of the pulverizing roller (13), it is possible to grasp the rotation state of the pulverizing roller (13) and monitor the wear state of the outer surface in the circumferential direction of the pulverizing roller (13).

[0134] In the solid fuel pulverizing apparatus (100) according to the present disclosure, the monitoring unit (101) may be provided with a protector (102) for the solid fuel that is falling.

[0135] According to the solid fuel pulverizing apparatus (100) according to the present disclosure, by providing the monitoring unit (101) with a protector (102) for the solid fuel that is falling, it is possible to suppress damage to the monitoring unit (101).

[0136] In the solid fuel pulverizing apparatus (100) according to the present disclosure, the upper surface in the vertical direction of the monitoring unit (101) may be inclined with respect to the horizontal direction.

[0137] According to the solid fuel pulverizing apparatus (100) according to the present disclosure, since the upper surface in the vertical direction of the monitoring unit (101) is inclined with respect to the horizontal direction, it is possible to suppress the deposition of solid fuel or the like on the monitoring unit (101).

[0138] The solid fuel pulverizing apparatus (100) according to the present disclosure may be configured such that the monitoring unit (101) uses a plurality of distance measuring sensors (S) that measure the distance to the outer surface of the pulverizing roller (13), and includes an arithmetic unit (52) that calculates the wear amount of the pulverizing roller (13) based on the measurement results of the distance measuring sensors (S).

[0139] According to the solid fuel pulverizing apparatus (100) according to the present disclosure, since the monitoring unit (101) is constituted by the distance measuring sensors (S), it is possible to monitor the wear state of the outer surface of the pulverizing roller (13). Then, the wear amount can be derived in the arithmetic unit (52).

[0140] The solid fuel pulverizing apparatus (100) according to the present disclosure may be such that the distance measuring sensors (S) are eddy current type or ultrasonic type.

[0141] According to the solid fuel pulverizing apparatus (100) according to the present disclosure, since the distance measuring sensors (S) are eddy current type or ultrasonic type, it is possible to monitor the wear state even in an environment with a high-concentration dust atmosphere.

[0142] In the solid fuel pulverizing apparatus (100) according to the present disclosure, in the monitoring unit (101), a plurality of the distance measuring sensors (S) arranged in the rotation axis direction of the pulverizing roller (13) are used as a set of sensor groups, and a plurality of the sensor groups are arranged in the circumferential direction of the pulverizing roller (13). The distance measuring sensors (S) adjacent in the circumferential direction may have the same position in the rotation axis direction.

[0143] According to the solid fuel pulverizing device (100) according to the present disclosure, a plurality of ranging sensors (S) arranged in the rotation axis direction are regarded as a set of sensor groups, and a plurality of these sensor groups are arranged in the circumferential direction. And the ranging sensors adjacent in the circumferential direction have the same position in the rotation axis direction. For this reason, each ranging sensor (S) will be arranged in a grid pattern. Since the pulverizing roller (13) rotates in the circumferential direction, arranging the sensor groups in a plurality of rows can improve redundancy.

[0144] In the solid fuel pulverizing device (100) according to the present disclosure, in the monitoring unit (101), a plurality of the ranging sensors (S) arranged in the rotation axis direction of the pulverizing roller (13) are regarded as a set of sensor groups, and a plurality of these sensor groups are arranged in the circumferential direction of the pulverizing roller (13). And the adjacent ranging sensors (S) in the circumferential direction may have different positions in the rotation axis direction.

[0145] According to the solid fuel pulverizing device (100) according to the present disclosure, a plurality of ranging sensors (S) arranged in the rotation axis direction are regarded as a set of sensor groups, and a plurality of these sensor groups are arranged in the circumferential direction. And the adjacent ranging sensors (S) in the circumferential direction have different positions in the rotation axis direction. For this reason, each ranging sensor (S) will be arranged, for example, in a staggered pattern. Since the positions in the rotation axis direction are different, the number of measurement points increases, and the outer surface can be monitored in more detail.

[0146] The solid fuel pulverizing device (100) according to the present disclosure may be provided with a cleaning unit (107) for cleaning the deposits on the pulverizing roller (13) on the upstream side in the rotation direction of the pulverizing roller (13) with respect to the monitoring unit (101).

[0147] According to the solid fuel pulverizing device (100) according to the present disclosure, by providing a cleaning unit (107) for cleaning the deposits on the pulverizing roller (13) on the upstream side in the rotation direction of the pulverizing roller (13), it is possible to further improve the monitoring accuracy.

[0148] The solid fuel pulverizing apparatus (100) according to the present disclosure may be configured such that the monitoring unit (101) includes an introduction unit (108) that introduces gas between the monitoring unit (101) and the outer surface of the pulverizing roller (13).

[0149] According to the solid fuel pulverizing apparatus (100) of the present disclosure, gas is introduced between the monitoring unit (101) and the outer surface of the pulverizing roller (13). Thereby, even if the inside of the mill (10) is in a dust atmosphere, gas is supplied between the monitoring unit (101) and the outer surface of the pulverizing roller (13), and the measurement accuracy can be improved. As the gas, a gas having a lower dust concentration than the dust concentration inside the mill (10) is used.

[0150] The solid fuel pulverizing apparatus (100) according to the present disclosure may be configured such that the monitoring unit (101) is arranged within a range of 90° or more and 315° or less, with the point where the pulverizing roller (13) and the pulverizing table (12) are closest to each other being 0° with respect to the rotation direction of the pulverizing roller (13).

[0151] According to the solid fuel pulverizing apparatus (100) of the present disclosure, since the monitoring unit (101) is arranged within a range of 90° or more and 315° or less, with the point where the pulverizing roller (13) and the pulverizing table (12) are closest to each other being 0° with respect to the rotation direction of the pulverizing roller (13), it is possible to prevent the monitoring unit (101) from being damaged by the solid fuel that has bounced off during the pulverization of the solid fuel by the pulverizing roller (13).

[0152] The solid fuel pulverizing apparatus (100) according to the present disclosure may be configured such that the monitoring unit (101) is provided with a position adjustment mechanism (110) that enables position adjustment with respect to the radial direction of the pulverizing roller (13).

[0153] As the wear of the grinding roller (13) progresses, the distance between the outer surface of the grinding roller (13) and the monitoring unit (101) increases, and there is a possibility of exceeding the monitoring range of the monitoring unit (101). Therefore, by providing a position adjustment mechanism (110) that enables position adjustment with respect to the radial direction of the grinding roller (13), it becomes possible to adjust the position of the monitoring unit (101) with respect to the grinding roller (13). As a result, even if wear progresses, it becomes possible to more reliably monitor the wear state by the monitoring unit (101).

[0154] In the solid fuel pulverizing apparatus (100) according to the present disclosure, the monitoring unit (101) may be provided with a position adjustment mechanism (111) that enables position adjustment of each of the distance measuring sensors (S) with respect to the radial direction of the grinding roller (13).

[0155] According to the solid fuel pulverizing apparatus (100) according to the present disclosure, the distance between the outer surface of the grinding roller (13) and the monitoring unit (101) increases, and there is a possibility of exceeding the monitoring range of the monitoring unit (101). Therefore, by providing a position adjustment mechanism (111) that enables position adjustment of each distance measuring sensor (S) with respect to the radial direction of the grinding roller (13), it becomes possible to adjust the position of each distance measuring sensor (S) with respect to the grinding roller (13). As a result, even if wear progresses, it becomes possible to more reliably monitor the wear state by the monitoring unit (101). In particular, even if local wear progresses on the surface of the grinding roller (13), the position of each distance measuring sensor (S) can be adjusted, so that the position can be adjusted more flexibly.

[0156] The solid fuel pulverizing apparatus (100) according to the present disclosure may include an estimation unit (53) that estimates the remaining life of the grinding roller (13) based on the wear amount detected by the monitoring unit (101).

[0157] According to the solid fuel pulverizing device (100) according to the present disclosure, the remaining life of the pulverizing roller (13) is estimated based on the wear amount of the pulverizing roller (13). Therefore, it is possible to improve the estimation accuracy of the remaining life in response to fluctuations in the operating state of the solid fuel pulverizing device (100) equipped with the pulverizing roller (13). By estimating the remaining life more accurately, maintenance (such as replacement) of the pulverizing roller (13) can be carried out at a more appropriate timing. That is, since the pulverizing roller (13) can be used for a longer time, the maintenance frequency can be reduced. For this reason, the maintenance cost can be reduced. In addition, the operating rate of the solid fuel pulverizing device (100) can be improved.

[0158] The solid fuel pulverizing device (100) according to the present disclosure may include a prediction unit (54) that predicts the future remaining life transition from the remaining life transition estimated by the estimation unit (53) based on a database in which the operating state and the remaining life transition characteristics corresponding to the operating state are accumulated in advance.

[0159] According to the solid fuel pulverizing device (100) according to the present disclosure, based on a database in which the operating state and the remaining life transition characteristics are associated, it is possible to predict the future remaining life transition from the remaining life transition estimated by the estimation unit (53). The future remaining life transition can be predicted more accurately, and maintenance (such as replacement) of the pulverizing roller (13) can be carried out at a more appropriate timing. That is, since the pulverizing roller (13) can be used for a longer time come it is possible to reduce the maintenance frequency. For this reason, the maintenance cost can be reduced. In addition, the operating rate of the solid fuel pulverizing device (100) can be improved.

[0160] In the solid fuel pulverizing device (100) according to the present disclosure, the operating state may include at least any one of information regarding the type of the solid fuel, the cumulative operating time, and the operating load.

[0161] According to the solid fuel pulverizing apparatus (100) according to the present disclosure, as an operating state, at least any one of information regarding the type of solid fuel, the cumulative operating time, and the operating load is used. Information regarding the type of solid fuel, the cumulative operating time, and the operating load are factors that affect the remaining life. Therefore, it is possible to effectively predict the future transition of the remaining life.

[0162] The solid fuel pulverizing apparatus (100) according to the present disclosure may include a planning unit (55) that creates a maintenance plan based on the estimated remaining life.

[0163] According to the solid fuel pulverizing apparatus (100) according to the present disclosure, by creating a maintenance plan based on the estimated remaining life, it is possible to plan with a margin at the maintenance time. For this reason, the operating rate of the solid fuel pulverizing apparatus (100) can be improved. In the maintenance plan, for example, the maintenance time, an operation plan for adjusting the maintenance time (for example, changing the type of solid fuel, etc.), load sharing adjustment in a plurality of fixed fuel pulverizing apparatuses, and the like can be performed.

[0164] The solid fuel pulverizing apparatus (100) according to the present disclosure may include an auxiliary distance measuring sensor (Sa) that measures a distance to a portion that is not worn by the pulverization of the solid fuel in the pulverizing roller (13), and a correction unit (56) that corrects the measurement results of each distance measuring sensor (S) based on the measurement result of the auxiliary distance measuring sensor (Sa).

[0165] Since the monitoring unit (101) is fixed to the journal head (45) that swings and displaces integrally with the grinding roller (13), the distance between the grinding roller (13) and the monitoring unit (101) is ideally kept constant. However, during the short-term pulverization of solid fuel, the position of the monitoring unit (101) relative to the grinding roller (13) may vary. In such a case, by measuring the distance to a non-wearing part of the solid fuel in the grinding roller (13), this short-term position variation can be grasped. Therefore, based on the measurement result of the auxiliary distance measuring sensor (Sa), by correcting the measurement results of each distance measuring sensor (S), it becomes possible to perform the measurement by the distance measuring sensor (S) while taking into account the short-term position variation of the grinding roller (13) relative to the monitoring unit (101). The non-wearing part of the solid fuel in the grinding roller (13) is, for example, the wheel part (113) of the grinding roller (13).

[0166] The power generation plant (1) according to the present disclosure includes the above-described solid fuel pulverizing device (100) and a boiler (200) that burns the solid fuel pulverized by the solid fuel pulverizing device (100) to generate steam.

[0167] The roller wear amount monitoring method according to the present disclosure is a roller wear amount monitoring method for a solid fuel pulverizing device (100) including a pulverizing table (12) on which solid fuel is placed, a grinding roller (13) that presses and pulverizes the solid fuel placed on the pulverizing table (12), and a journal head (45) that supports the grinding roller (13) and swings and displaces integrally with the grinding roller (13). The method monitors the wear state of the outer surface of the grinding roller (13) using a monitoring unit (101) fixedly provided on the journal head (45).

Explanation of reference numerals

[0168] 1: Power generation plant 10: Mill 11: Housing 11a: Inner peripheral surface 11b: Side surface part 12: Table (pulverizing table) 12a: Table liner 13: Roller (crushing roller) 14: Driving part 15: Mill motor 16: Rotary classifier 16a: Blade 17: Fuel supply part 18: Classifier motor 19: Outlet port 20: Coal feeder 21: Bunker 22: Conveyor part 23: Coal feeder motor 24: Downspout part 25: Blowing outlet 26: Vane 27: Primary air duct 30: Blower part 30a: Hot gas flow path 30b: Cold gas flow path 30c: Hot gas damper (first blower part) 30d: Cold gas damper (second blower part) 31: Primary air ventilator 32: Pressing ventilator 34: Heat exchanger 40: State detection part 41: Bottom part 42: Ceiling part 45: Journal head 46: Journal shaft 47: Support arm 48: Support shaft 49: Pressing device 50: Control device 51: Control part 52: Calculation part 53: Estimation part 54: Prediction part 55: Planning part 56: Correction part 63: Journal housing 64: Roller part 100: Solid fuel pulverizing device 100a: Primary air flow path 100b: Fine powder fuel supply flow path 101: Monitoring unit 102: Protector 103: Support 104: Cable 105: Protection tube 106: Inclined surface 107: Cleaning unit 108: Feeding part 109: Enclosing member 110: Position adjustment mechanism 111: Position adjustment mechanism 112: Nut 113: Wheel part 200: Boiler 210: Firebox 220: Burner 1010: Information aggregation system 1020: Server 1030: Planning system 1100: CPU 1200: ROM 1300: RAM 1400: Hard disk drive 1500: Communication part 1800: Bus S: Sensor (distance measuring sensor) Sa: Auxiliary sensor (auxiliary distance measuring sensor)

Claims

1. A grinding table on which a solid fuel is placed, A grinding roller that presses and grinds the solid fuel placed on the grinding table, A journal head that supports the grinding roller and swings integrally with the grinding roller, A monitoring unit that is fixedly provided on the journal head and monitors the wear state of the outer surface of the grinding roller, Comprising, The monitoring unit is configured using a plurality of distance measuring sensors that measure the distance to the outer surface of the grinding roller, A solid fuel grinding device comprising a calculation unit that calculates the wear amount of the grinding roller based on the measurement results of the distance measuring sensors.

2. The solid fuel grinding device according to claim 1, wherein the monitoring unit monitors the wear state of the outer surface in the circumferential direction of the grinding roller based on the rotation speed of the grinding roller.

3. The solid fuel grinding device according to claim 1 or 2, wherein a protector against the falling solid fuel is provided in the monitoring unit.

4. The solid fuel grinding device according to any one of claims 1 to 3, wherein the upper surface in the vertical direction of the monitoring unit is inclined with respect to the horizontal direction.

5. The solid fuel grinding device according to claim 1, wherein the distance measuring sensor is an eddy current type or an ultrasonic type.

6. In the monitoring unit, a plurality of the distance measuring sensors arranged in the rotation axis direction of the grinding roller are used as a set of sensor groups, and a plurality of the sensor groups are arranged in the circumferential direction of the grinding roller, and the adjacent distance measuring sensors in the circumferential direction have the same position in the rotation axis direction. The solid fuel grinding device according to any one of claims 1 to 5.

7. In the monitoring unit, a plurality of the distance measuring sensors arranged in the rotation axis direction of the grinding roller are used as a set of sensor groups, and a plurality of the sensor groups are arranged in the circumferential direction of the grinding roller, and the adjacent distance measuring sensors in the circumferential direction have different positions in the rotation axis direction. The solid fuel grinding device according to any one of claims 1 to 5.

8. The solid fuel grinding device according to any one of claims 1 to 7, further comprising a cleaning unit that cleans the deposits on the grinding roller on the upstream side in the rotation direction of the monitoring unit.

9. The solid fuel grinding device according to any one of claims 1 to 8, wherein the monitoring unit includes an input unit that inputs gas between the monitoring unit and the outer surface of the grinding roller.

10. The monitoring unit is arranged within a range of 90° or more and 315° or less, with the point where the grinding roller and the grinding table are closest to each other being 0° with respect to the rotational direction of the grinding roller, for the solid fuel grinding device according to any one of claims 1 to 9.

11. The monitoring unit is provided with a position adjustment mechanism that enables position adjustment with respect to the radial direction of the grinding roller, for the solid fuel grinding device according to any one of claims 1 to 10.

12. The monitoring unit is provided with a position adjustment mechanism that enables position adjustment of each of the distance measuring sensors with respect to the radial direction of the grinding roller, for the solid fuel grinding device according to claim 1.

13. The solid fuel grinding device according to any one of claims 1 to 12 includes an estimation unit that estimates the remaining life of the grinding roller based on the wear amount detected by the monitoring unit.

14. The solid fuel grinding device according to claim 13 includes a prediction unit that predicts the future transition of the remaining life based on the transition of the remaining life estimated by the estimation unit, based on a database in which the operating state and the remaining life transition characteristics corresponding to the operating state are stored in advance.

15. The operating state includes at least any one of information regarding the type of the solid fuel, the cumulative operating time, and the operating load, for the solid fuel grinding device according to claim 14.

16. The solid fuel grinding device according to any one of claims 13 to 15 includes a planning unit that creates a maintenance plan based on the estimated remaining life.

17. The monitoring unit includes an auxiliary distance measuring sensor that measures the distance to a portion of the grinding roller that is not worn by the grinding of the solid fuel, and a correction unit that corrects the measurement results of each of the distance measuring sensors based on the measurement results of the auxiliary distance measuring sensor, for the solid fuel grinding device according to any one of claims 1 to 5.

18. A power generation plant comprising the solid fuel grinding device according to any one of claims 1 to 16 and a boiler that burns the solid fuel ground by the solid fuel grinding device to generate steam.

19. A method for monitoring the roller wear amount of a solid fuel grinding device, the method including a grinding table on which solid fuel is placed, a grinding roller that presses and grinds the solid fuel placed on the grinding table, and a journal head that supports the grinding roller and swings integrally with the grinding roller. It is configured by using a plurality of distance measuring sensors that measure the distance to the outer surface of the grinding roller, and includes an arithmetic unit that calculates the wear amount of the grinding roller based on the measurement results of the distance measuring sensors. A roller wear amount monitoring method for monitoring the wear state of the outer surface of the grinding roller using a monitoring unit fixedly provided on the journal head.

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