Apparatus, power plant, apparatus control method, program, power plant system, and power plant system control method

Abstract

To grasp that a type of a solid fuel is changed in a state that influence of wear of a crushing roller is inhibited.SOLUTION: A device (solid fuel crushing device) 100 includes: an average value calculation part 51 which calculates an average value in a predetermined time range of a lift amount detected by a lift amount detection part 61 for detecting the lift amount of a crushing roller which crushes the solid fuel with a crushing table; and an average value monitoring part 52 which monitors variations of the average value of the lift amount calculated by the average value calculation part 51.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to an apparatus, a power plant, a control method for an apparatus, a program, a power plant system, and a control method for a power plant system. [Background technology]

[0002] Conventionally, solid fuels (carbon-containing solid fuels) such as coal and biomass fuel are pulverized into fine powder within a predetermined particle size range in a pulverizer (mill) and then supplied to a combustion device. In the mill, solid fuels such as coal and biomass fuels are fed onto a pulverization table and pulverized by sandwiching them between the pulverization table and a pulverization roller. The pulverized solid fuels are then sorted using a classifier to be finely divided into fine particles within a predetermined particle size range. The finely divided particles are transported to a boiler by a carrier gas (primary air) supplied from the periphery of the pulverization table and combusted in the combustion device (see, for example, Patent Document 1). In a thermal power plant, steam is generated by heat exchange with combustion gas produced by burning the pulverized fuel in the boiler. This steam drives a steam turbine, which in turn drives a generator connected to the steam turbine, thereby generating electricity.

[0003] Mills improve their crushing capacity by applying a force (crushing load) to the crushing rollers using springs or hydraulic pressure to press them against the crushing table. In particular, in mills that use hydraulic journal loads, the journal oil pressure (the hydraulic load applied to the crushing rollers) is sometimes controlled based on a base oil pressure that is set according to the amount of coal supplied to the mill. Furthermore, mills sometimes grind various types of solid fuel. In such cases, to address the grinding load variations that occur depending on the type of solid fuel (such as differences in the grindability of each solid fuel), the mill may control the journal hydraulic pressure by adjusting the base hydraulic pressure according to the lift amount of the grinding roller. Specifically, for example, if the lift amount of the grinding roller increases, the mill determines that the grinding load is insufficient and adjusts the hydraulic pressure accordingly. Conversely, if the lift amount of the grinding roller decreases, the mill determines that an excessive grinding load is being applied and adjusts the hydraulic pressure accordingly. Here, the lift amount of the grinding roller is the thickness of the powder layer (the layer of solid fuel on the grinding table) minus the distance (gap amount) between the outer circumferential surface of the grinding roller and the surface (top surface) of the grinding table under no load (when no solid fuel is present on the grinding table). In other words, it represents the amount by which the grinding roller is lifted by the powder layer and is used as an indicator of the mill's grinding load and the grinding condition within the mill. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 11-10025 Summary of the Invention [Problem to be solved by the invention]

[0005] In this way, in order to efficiently pulverize a plurality of types of solid fuel, it is necessary to appropriately change the journal oil pressure of the pulverizing roller for each type of solid fuel in accordance with its properties. The grinding rollers and grinding table wear as the mill operates. For example, the magnitude of the lift amount of the grinding rollers described above changes depending on the wear of the grinding rollers and grinding table. Specifically, as wear progresses, the gap increases, and the lift amount corresponding to the same powder layer thickness, i.e., the same grinding load, decreases. Therefore, if a change in the type of solid fuel is determined based solely on the magnitude of the lift amount of the grinding rollers, it may not be possible to make an appropriate determination if the grinding rollers, grinding table, etc. are worn.

[0006] The present disclosure has been made in consideration of the above circumstances, and aims to provide an apparatus, a power generation plant, an apparatus control method, a program, a power generation plant system, and a control method for a power generation plant system that can detect a change in the type of solid fuel regardless of the wear state of the grinding rollers, grinding table, etc. [Means for solving the problem]

[0007] In order to solve the above problems, the device and the device control method of the present disclosure employ the following means. The apparatus according to one aspect of the present disclosure includes a crushing roller that crushes a solid fuel between itself and a crushing table. , which changes with the progress of wear of the crushing roller and the crushing table. The device is equipped with an average value calculation unit that calculates the average value of the lift amount detected by the lift amount detection unit over a predetermined time range, and an average value monitoring unit that monitors the amount of fluctuation in the average value of the lift amount calculated by the average value calculation unit.

[0008] A method for controlling an apparatus according to one aspect of the present disclosure is a method for controlling an apparatus for pulverizing solid fuel, the apparatus comprising: a crushing roller for crushing the solid fuel between a crushing table and the crushing roller; , which changes with the progress of wear of the crushing roller and the crushing table. The method includes an average value calculation step for calculating an average value of the lift amount detected by the lift amount detection unit over a predetermined time range, and an average value monitoring step for monitoring the amount of fluctuation in the average value of the lift amount calculated in the average value calculation step. [Effects of the Invention]

[0009] According to the present disclosure, it is possible to know that the type of solid fuel has changed, regardless of the state of wear of the crushing roller. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a configuration diagram illustrating a power generation plant according to an embodiment of the present disclosure. [Figure 2] 2 is a block diagram showing a control unit provided in the solid fuel pulverizer of FIG. 1. FIG. [Figure 3] FIG. 10 is a diagram for explaining the lift amount of the crushing roller, showing the state of the crushing roller and the crushing table before they are worn. [Figure 4] 10 is a diagram for explaining the lift amount of the crushing roller, showing the state of the crushing roller and the crushing table after wear. FIG. [Figure 5] 10 is a graph showing changes in the lift amount of the crushing roller when the type of solid fuel is changed. [Figure 6] 10 is a graph showing changes in the lift amount difference of the crushing roller when the type of solid fuel is changed. [Figure 7] 10 is a chart showing the relationship between journal oil pressure for each type of solid fuel and the lift amount of the crushing roller, mill vibration, lift amount difference, and lift amount fluctuation period. [Figure 8] 10A and 10B are graphs showing the change in the lift amount of the crushing roller and the journal oil pressure when crushing solid fuel in a solid fuel crushing device according to an embodiment of the present disclosure, where (a) shows the change in the lift amount of the crushing roller and (b) shows the change in the journal oil pressure. [Figure 9] FIG. 10 is a configuration diagram illustrating a power plant according to a modified example of an embodiment of the present disclosure. [Figure 10] FIG. 10 is a block diagram showing functions provided in the solid fuel pulverizer and the information processing device of FIG. 9. DETAILED DESCRIPTION OF THE INVENTION

[0011] An embodiment of an apparatus, a power plant, an apparatus control method, a program, a power plant system, and a power plant system control method according to the present disclosure will be described below with reference to the drawings. The power plant 1 according to this embodiment includes a solid fuel pulverizer 100 and a boiler 200. In the following explanation, "upper" refers to the vertically upward direction, and "upper" in terms such as upper part and upper surface refers to the vertically upward part. Similarly, "lower" refers to the vertically downward part, and the vertical direction is not precise and may include errors.

[0012] The solid fuel pulverizer 100 of this embodiment is an apparatus that pulverizes solid fuel (carbon-containing solid fuel) such as coal or biomass fuel, generates pulverized fuel, and supplies it to a burner (combustion device) 220 of a boiler 200. The power plant 1 including the solid fuel pulverizer 100 and the boiler 200 shown in FIG. 1 is equipped with one solid fuel pulverizer 100, but it may also be a system equipped with multiple solid fuel pulverizers 100 corresponding to each of the multiple burners 220 of one boiler 200.

[0013] The solid fuel pulverizing device 100 of this embodiment comprises a mill (pulverizing section) 10, a coal feeder (fuel supplying machine) 20, a blower (carrier gas supplying section) 30, a state detecting section 40, and a control section (determination section) 50.

[0014] The mill 10, which pulverizes solid fuel such as coal or biomass fuel to be supplied to the boiler 200 into finely divided fuel, which is a finely divided solid fuel, may be of a type that pulverizes only coal, or may be of a type that pulverizes only biomass fuel, or may be of a type that pulverizes biomass fuel together with coal. Here, biomass fuel refers to organic resources derived from renewable living organisms, such as thinned wood, waste wood, driftwood, grass, waste, sludge, tires, and recycled fuels (pellets and chips) made from these materials, but is not limited to the ones listed here.Biomass fuels are carbon neutral, meaning they do not emit carbon dioxide, a greenhouse gas, because they absorb carbon dioxide during the biomass growth process, and various uses for them are being considered.

[0015] The mill 10 includes a housing 11, a grinding table 12, grinding rollers 13, a drive unit 14, a mill motor 15 connected to the drive unit 14 and driving the grinding table 12 to rotate, a rotary classifier 16, a fuel supply unit 17, and a classifier motor 18 that drives the rotary classifier 16 to rotate. The housing 11 is formed in a cylindrical shape extending in the vertical direction, and is a case that accommodates the crushing table 12, the crushing rollers 13, the rotary classifier 16, and the fuel supply unit 17. A fuel supply unit 17 is attached to the center of the ceiling 42 of the housing 11. This fuel supply unit 17 supplies solid fuel introduced from the bunker 21 into the housing 11, and is arranged in the vertical direction at the center of the housing 11, with its lower end extending into the interior of the housing 11.

[0016] A drive unit 14 is installed near the bottom surface 41 of the housing 11, and a mill motor 15 connected to the drive unit 14 transmits a driving force to rotate the grinding table 12, which is rotatably arranged. The crushing table 12 is a circular member in a plan view, and is disposed so that the lower end of the fuel supply unit 17 faces it. The upper surface of the crushing table 12 may, for example, have an inclined shape that is low in the center and rises toward the outside, with the outer periphery curved upward. The fuel supply unit 17 supplies solid fuel (in this embodiment, for example, coal or biomass fuel) from above toward the crushing table 12 below, and the crushing table 12 crushes the supplied solid fuel between itself and the crushing rollers 13.

[0017] When solid fuel is fed from the fuel supply unit 17 toward the approximate center region of the grinding table 12, the centrifugal force generated by the rotation of the grinding table 12 guides the solid fuel toward the outer periphery of the grinding table 12, where it is pinched and ground between the grinding table 12 and the grinding roller 13. The ground solid fuel is blown upward by the carrier gas (hereinafter referred to as primary air) guided from the carrier gas flow path (hereinafter referred to as primary air flow path) 100a, and is guided to the rotary classifier 16. An outlet (not shown) is provided on the outer periphery of the grinding table 12, through which primary air flowing in from the primary air flow path 100a flows out into the space above the grinding table 12 within the housing 11. A swirl blade (not shown) is provided at the outlet, which imparts a swirling force to the primary air blown out from the outlet. The primary air given a swirling force by the swirl blade becomes an airflow having a swirling velocity component, and transports the solid fuel pulverized on the grinding table 12 to the rotary classifier 16 located above in the housing 11. Of the pulverized solid fuel, particles larger than a predetermined particle size are classified by the rotary classifier 16, or fall without reaching the rotary classifier 16 and are returned to the grinding table 12, where they are pulverized again between the grinding table 12 and the grinding roller 13.

[0018] The crushing roller 13 is a rotating body that crushes the solid fuel supplied onto the crushing table 12 from the fuel supply unit 17. The crushing roller 13 is pressed against the upper surface of the crushing table 12 and cooperates with the crushing table 12 to crush the solid fuel. 1 shows only one representative crushing roller 13, but multiple crushing rollers 13 are arranged at regular intervals in the circumferential direction so as to press against the upper surface of the crushing table 12. For example, three crushing rollers 13 are arranged at equal intervals in the circumferential direction on the outer periphery, at angular intervals of 120°. In this case, the portions of the three crushing rollers 13 that come into contact with the upper surface of the crushing table 12 (pressing portions) are equidistant from the rotational axis of the crushing table 12.

[0019] The crushing roller 13 can swing up and down by a journal head 45, and is supported so as to be able to move toward and away from the upper surface of the crushing table 12. When the crushing table 12 rotates, the crushing roller 13 receives a rotational force from the crushing table 12 and rotates with it, with the outer circumferential surface of the crushing roller 13 in contact with the solid fuel on the upper surface of the crushing table 12. When solid fuel is supplied from the fuel supply unit 17, the solid fuel is pressed between the crushing roller 13 and the crushing table 12 and crushed.

[0020] A support arm 47 of the journal head 45 is supported on the side surface of the housing 11 by a support shaft 48 whose middle portion is aligned horizontally, allowing the crushing roller 13 to swing up and down around the support shaft 48. A load applying unit (pressing device) 49 is provided at the upper end portion on the vertically upper side of the support arm 47. The load applying unit 49 is fixed to the housing 11, and applies journal oil pressure (crushing load) to the crushing roller 13 via the support arm 47 etc. so as to press the crushing roller 13 against the crushing table 12.

[0021] The drive unit 14 is a device that transmits a drive force to the grinding table 12 and rotates the grinding table 12 around its central axis. The drive unit 14 is connected to a mill motor 15 and transmits the drive force of the mill motor 15 to the grinding table 12.

[0022] The rotary classifier 16 is provided at the top of the housing 11 and has a hollow, generally inverted cone-shaped exterior. The rotary classifier 16 is provided with a plurality of blades 16a extending in the vertical direction around its outer periphery. The blades 16a are provided at predetermined intervals (equally spaced) around the central axis of the rotary classifier 16. The rotary classifier 16 is a device that classifies solid fuel pulverized by the pulverizing table 12 and pulverizing rollers 13 (hereinafter, the pulverized solid fuel will be referred to as "pulverized fuel") into particles larger than a predetermined particle size (for example, 70 to 100 μm for coal) (hereinafter, pulverized fuel exceeding the predetermined particle size will be referred to as "coarse pulverized fuel") and particles smaller than the predetermined particle size (hereinafter, pulverized fuel smaller than the predetermined particle size will be referred to as "fine pulverized fuel"). The rotary classifier 16, which classifies by rotation, is also called a rotary separator, and is given a rotational driving force by a classifier motor 18 controlled by a control unit 50, and rotates around a fuel supply unit 17 centered on a cylindrical axis (not shown) extending in the vertical direction of the housing 11. The classifier may be a fixed classifier having a fixed hollow inverted cone-shaped casing and a plurality of fixed swirl vanes on the outer periphery of the casing instead of the blades 16a.

[0023] When the pulverized fuel reaches the rotary classifier 16, due to the relative balance between the centrifugal force generated by the rotation of the blades 16a and the centripetal force of the primary air flow, large diameter coarse pulverized fuel particles are knocked down by the blades 16a and returned to the pulverizing table 12 to be pulverized again, and the pulverized fuel is led to the outlet port 19 in the ceiling 42 of the housing 11. The pulverized fuel classified by the rotary classifier 16 is discharged from the outlet port 19 together with the primary air into the pulverized fuel supply passage 100b and supplied to the burner 220 of the boiler 200. When the solid fuel is coal, the pulverized fuel supply passage 100b is also called a pulverized coal pipe.

[0024] The fuel supply unit 17 is attached so that its lower end extends vertically into the interior of the housing 11 so as to penetrate through the ceiling 42 of the housing 11, and supplies solid fuel fed from the top of the fuel supply unit 17 to the approximate central region of the grinding table 12. The fuel supply unit 17 is supplied with solid fuel from the coal feeder 20.

[0025] The coal feeder 20 includes a conveying unit 22 and a coal feeder motor 23. The conveying unit 22 is, for example, a belt conveyor, and by the driving force provided by the coal feeder motor 23, conveys the solid fuel discharged from the lower end of the downspout 24 located directly below the bunker 21 to the top of the fuel supply unit 17 of the mill 10 and inputs it into the fuel supply unit 17. Normally, primary air is supplied to the inside of the mill 10 to transport pulverized fuel to the burner 220, and the pressure therein is higher than that of the coal feeder 20 and the bunker 21. Downspout 24, a pipe extending in the vertical direction directly below bunker 21, holds fuel in a layered state inside, and the layer of solid fuel stacked inside downspout 24 ensures a seal that prevents the primary air and pulverized fuel on the mill 10 side from flowing back toward the bunker 21 side. The amount of solid fuel supplied to the mill 10 is adjusted by, for example, the moving speed of the belt conveyor of the transport unit 22.

[0026] The blower 30 is a device that blows primary air into the housing 11 to dry the pulverized fuel and transport it to the rotary classifier 16 . In this embodiment, the blower section 30 is equipped with a primary air fan (PAF) 31, a hot gas flow path 30a, a cold gas flow path 30b, a hot gas damper 30c, and a cold gas damper 30d in order to appropriately adjust the flow rate and temperature of the primary air blown into the inside of the housing 11.

[0027] In this embodiment, the hot gas flow path 30a supplies a portion of the air (outside air) sent out from the primary air fan 31 as hot gas that has been heated by passing through a heat exchanger 34, such as an air preheater. A hot gas damper 30c is provided downstream of the hot gas flow path 30a. The opening degree of the hot gas damper 30c is controlled by the control unit 50. The flow rate of the hot gas supplied from the hot gas flow path 30a is determined by the opening degree of the hot gas damper 30c.

[0028] Cold gas flow path 30b supplies a portion of the air sent out from primary air ventilator 31 as cold gas at room temperature. Cold gas damper 30d is provided downstream of cold gas flow path 30b. The opening degree of cold gas damper 30d is controlled by control unit 50. The flow rate of cold gas supplied from cold gas flow path 30b is determined by the opening degree of cold gas damper 30d.

[0029] In this embodiment, the flow rate of the primary air is the sum of the flow rate of the hot gas supplied from the hot gas flow path 30a and the flow rate of the cold gas supplied from the cold gas flow path 30b, and the temperature of the primary air is determined by the mixing ratio of the hot gas supplied from the hot gas flow path 30a and the cold gas supplied from the cold gas flow path 30b, and is controlled by the control unit 50. In addition, the oxygen concentration of the primary air blown into the inside of the housing 11 from the primary air flow path 100a may be adjusted by introducing and mixing a portion of the combustion gas discharged from the boiler 200 via a gas recirculation ventilator (not shown) into the hot gas supplied from the hot gas flow path 30a.

[0030] In this embodiment, the state detection unit 40 of the mill 10 transmits measured or detected data to the control unit 50. The state detection unit 40 of this embodiment is, for example, a differential pressure measurement means, and measures the differential pressure of the mill 10 as the pressure difference between the pressure at the portion where primary air flows from the primary air flow path 100a into the housing 11 and the pressure at the outlet port 19 where the primary air and pulverized fuel are discharged from the housing 11 to the pulverized fuel supply flow path 100b. An increase or decrease in this differential pressure of the mill 10 corresponds to an increase or decrease in the amount of pulverized fuel circulating between the vicinity of the rotary classifier 16 inside the housing 11 and the vicinity of the grinding table 12 due to the classification effect of the rotary classifier 16. In other words, by adjusting the rotation speed of the rotary classifier 16 according to the differential pressure of the mill 10, the amount of pulverized fuel discharged from the outlet port 19 can be adjusted relative to the amount of solid fuel supplied to the mill 10.Therefore, within the 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 amount of solid fuel supplied to the mill 10 can be stably supplied to the burner 220 provided in the boiler 200. The state detection unit 40 of this embodiment is, for example, a temperature measurement means that detects the temperature of the primary air supplied to the inside of the housing 11 (the temperature of the primary air 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 that the upper limit temperature does not exceed this. The upper limit temperature is determined taking into consideration the possibility of ignition of the solid fuel, etc. The primary air is cooled inside the housing 11 by transporting the pulverized fuel while drying it, and the temperature of the primary air at the outlet port 19 is, for example, about 60 to 90 degrees.

[0031] The control unit 50 is a device that controls each part of the solid fuel pulverizer 100 . The control unit 50 may, for example, transmit a drive command to the mill motor 15 to control the rotation speed of the grinding table 12. The control unit 50, for example, transmits a drive command to the classifier motor 18 to control the rotational speed of the rotary classifier 16, thereby adjusting the classification performance, and by optimizing the differential pressure of the mill 10, i.e., the amount of pulverized fuel circulating inside the mill 10, within a predetermined range, it is possible to stably supply pulverized fuel to the burner 220. In addition, the control unit 50 can adjust the amount of solid fuel (amount of coal supply) that the conveying unit 22 conveys and supplies to the fuel supply unit 17, for example, by transmitting a drive instruction to the coal supply motor 23 of the coal supply unit 20. Furthermore, the control unit 50 can adjust the flow rate and temperature of the primary air by controlling the opening of the hot gas damper 30c and the cold gas damper 30d by transmitting an opening command to the blower 30. Specifically, the control unit 50 controls the opening of the hot gas damper 30c and the cold gas damper 30d so that the flow rate of the primary air supplied to the inside of the housing 11 and the temperature of the primary air at the outlet port 19 become predetermined values set in accordance with the amount of coal feed for each type of solid fuel.

[0032] The control unit 50 is composed of, for example, a central processing unit (CPU), random access memory (RAM), read-only memory (ROM), and a computer-readable storage medium. A series of processes for implementing various functions is stored in a storage medium, for example, in the form of a program. The CPU reads the program into the RAM and executes information processing and arithmetic operations to implement various functions. The program may be pre-installed in a ROM or other storage medium, provided in a state stored in a computer-readable storage medium, or distributed via wired or wireless communication means. Examples of computer-readable storage media include magnetic disks, magneto-optical disks, CD-ROMs, DVD-ROMs, and semiconductor memories. The HDD may be replaced with a solid-state disk (SSD), for example.

[0033] Next, a description will be given of the boiler 200 that generates steam by burning the pulverized fuel supplied from the solid fuel pulverizer 100. The boiler 200 includes a furnace 210 and a burner 220.

[0034] The burner 220 is a device that burns pulverized fuel to form a flame using primary air containing pulverized fuel supplied from the pulverized fuel supply passage 100b and secondary air supplied by heating air (outside air) sent out from a forced draft fan (FDF) 32 in a heat exchanger 34. The pulverized fuel is burned 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 coal economizer.

[0035] The combustion gas discharged from the boiler 200 undergoes predetermined processing in an environmental device (such as a denitration device or an electrostatic precipitator, not shown), and then undergoes heat exchange in a heat exchanger 34, such as an air preheater, between the air discharged from the primary air fan 31 and the air discharged from the forced draft fan 32, and is then guided to a chimney (not shown) via an induced draft fan (IDF) 33 and released into the outside air. The air discharged from the primary air fan 31, heated by the combustion gas in the heat exchanger 34, is supplied to the above-mentioned hot gas flow path 30a. The water supplied to each heat exchanger of the boiler 200 is heated in a coal economizer (not shown), and then further heated in an evaporator (not shown) and a superheater (not shown) to generate high-temperature, high-pressure steam, which is then sent to the power generation section, a steam turbine (not shown), to rotate and drive the steam turbine, which then rotates and drives a generator (not shown) connected to the steam turbine to generate electricity, thereby constituting the power generation plant 1.

[0036] As shown in FIG. 2, the mill 10 of this embodiment is also provided with a lift amount detector 61 that detects the lift amount of the crushing roller 13, and a vibration detector 62 that detects vibrations of the mill 10.

[0037] The lift amount detection unit 61 continuously or intermittently detects the lift amount of the crushing roller 13. The lift amount detection unit 61 transmits the detected lift amount to the control unit 50. The lift amount detection unit 61 detects the lift amount, for example, by detecting the rotation angle of the support shaft 48 from a reference time.

[0038] The lift amount L of the crushing roller 13 will be explained using Figures 3 and 4. Figure 3 shows the state of the crushing roller 13 and the crushing table 12 before wear, and Figure 4 shows the state of the crushing roller 13 and the crushing table 12 after wear. In Figures 3 and 4, the left side shows the no-load state (a state in which no solid fuel is present on the crushing table 12), and the right side shows the state in which the mill 10 is operating (a state in which solid fuel is being crushed on the crushing table 12). The dashed dotted line C in Figures 3 and 4 indicates the central axis of the crushing roller 13. As shown in FIG. 3, the lift amount L of the grinding roller 13 is the thickness t of the powder layer F (the layer of solid fuel on the grinding table 12) to be ground, minus the distance (gap amount δ) between the outer circumferential surface of the grinding roller 13 and the surface (top surface) of the grinding table 12 in an unloaded state (when no solid fuel is present on the grinding table 12). In other words, this represents the amount by which the grinding roller 13 is lifted by the powder layer, and is used as an indicator of the grinding load of the mill 10. The gap amount δ is set to a specified value after installation of the mill 10 or replacement of the grinding roller 13. Depending on the model of the mill 10 and the materials of the grinding roller 13 and grinding table 12, the gap amount δ may also be set to zero (a state in which the outer circumferential surface of the grinding roller 13 and the surface (top surface) of the grinding table 12 are in contact). Furthermore, as shown in Fig. 4, the magnitude of the lift amount L of the crushing roller 13 changes as wear progresses on the crushing roller 13 and the crushing table 12. Specifically, as wear progresses, the gap amount δ increases, and the lift amount L corresponding to the same thickness t of the powder layer F, i.e., the same crushing load, decreases. In the example of Fig. 4, as wear progresses on the crushing roller 13 and the crushing table 12, the gap amount increases from δ to δ1 compared to before wear (the example of Fig. 3), and as a result, the lift amount decreases from L to L1.

[0039] The vibration detection unit 62 continuously or intermittently detects the amount of vibration of the mill 10. The vibration detection unit 62 transmits the detected amount of vibration to the control unit 50. The vibration detection unit 62 is provided, for example, in the housing 11 (see FIG. 1 ) and detects vibration of the housing 11 in the vertical direction.

[0040] 2, the control unit 50 includes an average value calculation unit 51 that calculates the average value of the lift amount within a predetermined time range, an average value monitoring unit 52 that monitors the amount of fluctuation in the average value of the lift amount calculated by the average value calculation unit 51, a difference calculation unit 53 that calculates the difference between the maximum and minimum values of the lift amount detected by the lift amount detection unit 61 within a predetermined time range, and a difference monitoring unit 54 that monitors the amount of fluctuation in the difference calculated by the difference calculation unit 53. The control unit 50 also includes a change determination unit 55 that determines whether the type of solid fuel supplied to the mill 10 has changed, a load adjustment unit 56 that adjusts the grinding load applied to the grinding roller 13 by the load application unit 49 based on the difference calculated by the difference calculation unit 53, and a period calculation unit 57 that calculates the period of fluctuation in the lift amount detected by the lift amount detection unit 61.

[0041] The average value calculation unit 51 receives the lift amount detected by the lift amount detection unit 61 at predetermined time intervals. As shown in FIG. 5, the lift amount fluctuates in a waveform pattern in accordance with the rotation of the grinding table 12 and the grinding roller 13. The average value calculation unit 51 calculates the average value of the lift amount within a predetermined time range R1 (see FIG. 5) from the received lift amount. The predetermined time range R1 may be, for example, between 5 seconds and 60 seconds.

[0042] The average value monitoring unit 52 constantly monitors the amount of change in the average value of the lift amount calculated by the average value calculation unit 51. When the average value of the lift amount changes by a predetermined threshold or more, the average value monitoring unit 52 may transmit to the change determination unit 55 that fact and the amount of change.

[0043] The difference calculation unit 53 receives the lift amount detected by the lift amount detection unit 61 at predetermined time intervals. As described above, the lift amount fluctuates in a waveform pattern (see FIG. 6). As shown in FIG. 6, the difference calculation unit 53 calculates the difference between the maximum and minimum values in a predetermined time range R2 (in other words, the fluctuation range of the lift amount). The predetermined time range R2 may be, for example, between 5 seconds and 60 seconds.

[0044] The difference monitoring unit 54 constantly monitors the amount of change in the lift amount difference calculated by the difference calculation unit 53. When the difference changes by a predetermined threshold or more, the difference monitoring unit 54 may transmit to the change determination unit 55 that fact and the amount of change.

[0045] In a solid fuel pulverizer, the type of solid fuel supplied may change during operation. Furthermore, the pulverizability (ease of pulverization) of solid fuel varies depending on the type. Therefore, for example, the solid fuel pulverizer may continuously pulverize a solid fuel with high pulverizability (easy to pulverize) and then continuously pulverize a solid fuel with low pulverizability (difficult to pulverize). In the following description and drawings, the type of solid fuel may also be referred to as a "coal type." The change determination unit 55 determines whether the type of solid fuel supplied to the mill 10 has changed based on the amount of change in the average value of the lift amount calculated by the average value calculation unit 51 and the amount of change in the difference between the maximum and minimum values of the lift amount calculated by the difference calculation unit 53.

[0046] Figure 5 shows the change in the lift amount of the grinding roller 13 when grinding a solid fuel with low grindability and then grinding a solid fuel with high grindability, while maintaining the operating conditions of the mill 10, such as the supply amount of solid fuel, grinding load, and classifier rotation speed, constant. As shown in Fig. 5, when pulverizing a solid fuel with low pulverizability, the lift amount of the pulverizing roller 13 becomes relatively large. Therefore, the average value A1 of the lift amount within a predetermined time range also becomes large. This is because solid fuel with low pulverizability is difficult to pulverize to a predetermined particle size or less, and therefore is difficult to discharge from the solid fuel pulverizing device, and the layer of solid fuel formed between the pulverizing table 12 and the pulverizing roller 13 becomes thick. On the other hand, when pulverizing a solid fuel with high pulverizability, the lift amount of the pulverizing roller 13 becomes relatively small. Therefore, the average value A2 of the lift amount within a predetermined time range also becomes small. This is because a solid fuel with high pulverizability is pulverized to a particle size of a predetermined particle size or less in a short time, and the solid fuel pulverization This is because the solid fuel is easily discharged from the device, so the amount of solid fuel remaining in the solid fuel crushing device is small, and the layer of solid fuel formed between the crushing table 12 and the crushing rollers 13 is thin.

[0047] In this way, as the type of solid fuel changes, the average value of the lift amount of the grinding roller 13 also changes in accordance with changes in the grindability of the solid fuel. Based on the amount of change in this average value, the change determination unit 55 determines whether the type of solid fuel supplied to the mill 10 has changed. Specifically, for example, if the amount of change in the average value is equal to or greater than a predetermined threshold, the change determination unit 55 determines that the type of solid fuel supplied to the mill 10 has changed. The predetermined threshold for the amount of change in the average value of the lift amount is, for example, 5 mm to 15 mm. In the example of Fig. 5, the amount of change in the average value increases at time P1, which allows us to determine that the type of solid fuel has changed at time P1.

[0048] 6 shows the change in the lift amount of the crushing roller 13 when crushing a solid fuel with high crushability and then crushing a solid fuel with low crushability, while maintaining constant operating conditions of the mill 10, such as the amount of solid fuel supplied, crushing load, and classifier rotation speed. As shown in FIG. 6, the difference between the maximum and minimum values of the lift amount (the fluctuation range of the lift amount) may vary depending on the type of solid fuel. When the pulverization load is constant, the difference D1 within a predetermined time range when pulverizing a solid fuel with high pulverizability is smaller than the difference D2 within a predetermined time range when pulverizing a solid fuel with low pulverizability. This is because, under the same pulverization load, a solid fuel with high pulverizability is pulverized to a predetermined particle size or less in a shorter time than a solid fuel with low pulverizability, and is therefore more easily discharged from the solid fuel pulverizer, so the amount of solid fuel remaining in the solid fuel pulverizer is smaller, and the layer of solid fuel formed between the pulverization table 12 and the pulverization roller 13 is thinner, thereby reducing the amount of roller movement.

[0049] In this way, based on the amount of change in the difference, the change determination unit 55 determines whether or not the type of solid fuel supplied to the mill 10 has changed. Specifically, for example, if the amount of change in the difference is equal to or greater than a predetermined threshold, the change determination unit 55 determines that the type of solid fuel supplied to the mill 10 has changed. The predetermined threshold for the difference in lift amount is, for example, 2 mm to 6 mm. In the example of Figure 6, the amount of variation in the difference increases at time P2. This allows us to determine that the type of solid fuel has changed at time P2. Furthermore, the amount of variation in the average lift amount also increases at time P2. This also allows us to determine that the type of solid fuel has changed at time P2 from the variation in the average lift amount.

[0050] The change determination unit 55 may determine whether the type of solid fuel supplied to the mill 10 has changed when both the amount of change in the average value and the amount of change in the difference exceed a predetermined threshold. Alternatively, the change determination unit 55 may determine whether the type of solid fuel supplied to the mill 10 has changed when either the amount of change in the average value or the amount of change in the difference exceeds a predetermined threshold.

[0051] The change determination unit 55 also determines the grindability of the solid fuel to be pulverized. For example, the change determination unit 55 may determine that the grindability of the solid fuel after the change is low if the average lift amount of the pulverizing roller 13 increases by a predetermined threshold or more compared to the average lift amount obtained immediately before. The change determination unit 55 may also determine that the grindability of the solid fuel after the change is high if the average lift amount of the pulverizing roller 13 decreases by a predetermined threshold or more compared to the average lift amount obtained immediately before. The memory unit 58 may store the relationship between the average lift amount of the crushing roller 13 and crushability, and the crushability of the solid fuel to be crushed may be determined based on this relationship. This relationship may be in the form of a correspondence table or may be defined by a function.

[0052] The period calculation unit 57 calculates the period T (see FIG. 5) of the fluctuation in the lift amount detected by the lift amount detection unit 61.

[0053] The load adjustment unit 56 adjusts the grinding load (hereinafter referred to as "journal oil pressure" or "oil pressure") applied by the load application unit 49 to the grinding roller 13 based on the grindability of the solid fuel determined by the change determination unit 55, the lift amount of the grinding roller 13, the difference calculated by the difference calculation unit 53, the period calculated by the period calculation unit 57, and the vibration amount of the mill 10 detected by the vibration detection unit 62. The control unit 50 includes a memory unit 58, which stores a correspondence table that defines the relationship between the pulverization property of the solid fuel, the journal oil pressure, the lift amount of the grinding roller 13, the vibration amount of the mill 10, the difference in the lift amount (swing amplitude), and the fluctuation period of the lift amount. An example of the correspondence table for each parameter will be described with reference to Fig. 7. In the example of Fig. 7, the magnitude of each parameter is shown in three levels: large, medium, and small.

[0054] First, we will explain the case where a solid fuel with high pulverizability is pulverized. As shown in Figure 7, when the journal oil pressure is excessive, the layer of solid fuel on the pulverizing table 12 becomes thin, so the lift amount of the pulverizing roller 13 becomes small. On the other hand, when the journal oil pressure is insufficient, the lift amount of the pulverizing roller 13 becomes medium. Furthermore, if the journal oil pressure is excessive, the vibration of the mill 10 will be large. This is because the vibration absorption effect of the solid fuel layer will be reduced as the layer of solid fuel on the grinding table 12 becomes thinner. On the other hand, if the journal oil pressure is insufficient, the vibration of the mill 10 will be medium. Furthermore, when the journal oil pressure is excessive, the difference between the maximum and minimum values of the lift amount is small, whereas when the journal oil pressure is insufficient, the difference between the lift amounts is large. Furthermore, when the journal oil pressure is excessive, the fluctuation period of the lift amount becomes small, whereas when the journal oil pressure is insufficient, the fluctuation period of the lift amount becomes medium.

[0055] Next, we will explain the case where a solid fuel with low pulverizability is pulverized. As shown in Figure 7, when the journal oil pressure is excessive, the lift amount of the pulverizing roller 13 is medium. On the other hand, when the journal oil pressure is insufficient, the lift amount of the pulverizing roller 13 is small. Furthermore, when the journal oil pressure is excessive, the vibration of the mill 10 is medium. On the other hand, when the journal oil pressure is insufficient, the vibration of the mill 10 is small. When the journal oil pressure is excessive, the difference between the maximum and minimum values of the lift amount is relatively small, whereas when the journal oil pressure is insufficient, the difference between the maximum and minimum values of the lift amount is large. Furthermore, when the journal oil pressure is excessive, the fluctuation period of the lift amount becomes medium, whereas when the journal oil pressure is insufficient, the fluctuation period of the lift amount becomes large.

[0056] The load adjusting unit 56 determines whether the journal oil pressure is excessive or insufficient based on a correspondence table of each parameter stored in the memory unit 58. If the load adjusting unit 56 determines that the journal oil pressure is excessive, it controls the load applying unit 49 to reduce the journal oil pressure. On the other hand, if the load adjusting unit 56 determines that the journal oil pressure is insufficient, it controls the load applying unit 49 to increase the journal oil pressure. 6, the average value monitoring unit 52 monitors the amount of change in the average value of the lift amount of the crushing roller 13 (average value monitoring step), and the difference monitoring unit 54 monitors the difference in the lift amount of the crushing roller 13. This allows the change determining unit 55 to determine that the solid fuel supplied to the mill 10 has changed from solid fuel with high pulverizability to solid fuel with low pulverizability at timing P2. The load adjusting unit 56 then acquires the lift amount of the crushing roller 13, the difference calculated by the difference calculating unit 53, the period calculated by the period calculating unit 57, and the amount of vibration of the mill 10 detected by the vibration detecting unit 62. Furthermore, when the pulverizability of the solid fuel is low, the load adjusting unit 56 By applying each parameter to the correspondence table in the table, it is determined whether the journal oil pressure is excessive or insufficient.

[0057] According to this embodiment, the following advantageous effects are achieved. This embodiment includes an average value calculation unit 51 that calculates the average value of the lift amounts detected by the lift amount detection unit 61 over a predetermined time range, and an average value monitoring unit 52 that monitors the amount of fluctuation in the average value of the lift amounts calculated by the average value calculation unit 51. When the type of solid fuel to be pulverized in the solid fuel pulverization device changes and the lift amount of the pulverization roller 13 continuously changes, the amount of fluctuation in the average value of the lift amount calculated by the average value calculation unit 51 changes (see FIGS. 5 and 6). Since the average value monitoring unit 52 monitors the amount of fluctuation in the average value of the lift amount, in this embodiment, it is possible to know that the type of solid fuel to be pulverized has changed from the change in the average value of the lift amount.

[0058] Furthermore, in this embodiment, the amount of change in the average value of the lift amount is monitored. The amount of change in the average value of the lift amount indicates how much the average value of the lift amount has changed relative to a certain reference point (for example, the average value calculated immediately before). This makes the amount of change in the average value of the lift amount less susceptible to the influence of wear on the crushing roller 13. Therefore, it is possible to grasp the change in the type of solid fuel while suppressing the influence of wear on the crushing roller 13.

[0059] The difference between the maximum and minimum lift amounts of the crushing roller 13 within a predetermined time range varies depending on the solid fuel to be crushed. This embodiment includes a difference calculation unit 53 that calculates the difference between the maximum and minimum values of the lift amount detected by the lift amount detection unit 61, and a difference monitoring unit 54 that monitors the amount of fluctuation in the difference in the lift amount calculated by the difference calculation unit 53. When the type of solid fuel to be pulverized in the solid fuel pulverization device changes and the lift amount of the pulverization roller 13 continuously changes, the difference between the maximum and minimum values of the lift amount calculated by the difference calculation unit 53 changes. Because the difference monitoring unit 54 monitors the amount of fluctuation in the difference between the maximum and minimum values of the lift amount, in this embodiment, it is possible to know that the type of solid fuel to be pulverized has changed from the change in the difference between the maximum and minimum values of the lift amount.

[0060] Furthermore, in this embodiment, the amount of variation in the lift amount difference is monitored. The amount of variation in the lift amount difference indicates how much the lift amount difference has changed relative to a certain reference point (for example, the difference calculated immediately before). This makes the amount of variation in the lift amount difference less susceptible to the influence of wear on the crushing roller 13. Therefore, it is possible to grasp the change in the type of solid fuel while suppressing the influence of wear on the crushing roller 13.

[0061] In this embodiment, the change determination unit 55 can determine whether the type of solid fuel to be pulverized has changed. In addition, since the determination of whether the type of solid fuel has changed is based on both the amount of change in the average lift amount and the amount of change in the difference between the maximum and minimum values of the lift amount, a more accurate determination can be made compared to when the determination is based on only one of them.

[0062] In this embodiment, the load applying unit 49 adjusts the crushing load applied to the crushing roller 13 based on the difference calculated by the difference calculating unit 53. This makes it possible to apply an appropriate load to the crushing roller 13. Therefore, the solid fuel can be crushed in an appropriate manner. Furthermore, in this embodiment, the load applying unit 49 adjusts the crushing load applied to the crushing roller 13 based on not only the difference calculated by the difference calculating unit 53 but also the period of the fluctuation in the lift amount calculated by the period calculating unit 57. This makes it possible to apply a more appropriate crushing load to the crushing roller 13. Therefore, the solid fuel can be crushed more suitably. Furthermore, in this embodiment, the load applying unit 49 adjusts the crushing load applied to the crushing roller 13 based not only on the difference calculated by the difference calculating unit 53 but also on the vibration of the mill 10 detected by the vibration detecting unit 62. This allows a more appropriate crushing load to be applied to the crushing roller 13. Therefore, the solid fuel can be crushed more suitably.

[0063] Furthermore, in this embodiment, as described above, the crushing load applied to the crushing roller 13 is adjusted based on the crushability of the solid fuel, the roller lift amount, and the difference in the lift amount (swing width). The crushability of the solid fuel, the roller lift amount, and the difference in the lift amount (swing width) are not easily affected by wear of the crushing roller 13 or the crushing table 12. Therefore, the crushing load applied to the crushing roller 13 can be adjusted while suppressing the effect of wear of the crushing roller 13.

[0064] Specific effects will be described with reference to FIG. 8. FIG. 8 is a graph showing changes in the lift amount and journal oil pressure of the crushing roller 13 when solid fuel is crushed in the solid fuel crushing device. (a) of FIG. 8 shows changes in the lift amount of the crushing roller 13, and (b) shows changes in the journal oil pressure. The left side of the graph shows a state in which the crushing roller 13 is not worn (a state in which the amount of wear is small), and the right side of the graph shows a state in which the crushing roller 13 is worn (a state in which the amount of wear is large). The dashed line in FIG. 8 shows the lift amount of the crushing roller 13 when the journal oil pressure is not adjusted (i.e., when the crushing load is always applied at the base journal oil pressure). The dashed line in FIG. 8 shows the lift amount and journal oil pressure of the crushing roller 13 when the journal oil pressure is adjusted based only on the lift amount of the crushing roller 13. The solid line in FIG. 8 shows the lift amount and journal oil pressure of the crushing roller 13 when the crushing roller 13 is adjusted as described in this embodiment.

[0065] As shown in Figure 8(a), before wear of the crushing roller 13 progresses, when crushing a solid fuel with medium crushability, the lift amount of the crushing roller 13 is close to the set value. At this time, as shown in Figure 8(b), the journal oil pressure is not adjusted. Therefore, the journal oil pressure becomes the base oil pressure. Next, at time P3, when the type of solid fuel changes and a solid fuel with low pulverizability is pulverized, the lift amount of the crushing roller 13 increases. At this time, as shown by the dashed line, if the journal oil pressure is adjusted based only on the lift amount, the journal oil pressure is increased. By performing this control, as shown in Figure 8(a), it is possible to suppress the increase in the lift amount of the crushing roller 13 compared to when the journal oil pressure is not adjusted (in the case of the dashed line). Next, at time P4, when the type of solid fuel changes and a solid fuel with high pulverizability is pulverized, the lift amount of the crushing roller 13 decreases. At this time, as shown by the dashed line, if the journal oil pressure is adjusted based only on the lift amount, the journal oil pressure is reduced below the base oil pressure. By performing this control, as shown in Figure 8(a), it is possible to suppress the decrease in the lift amount of the crushing roller 13 compared to when the journal oil pressure is not adjusted (in the case of the dashed line). In this way, before wear of the crushing roller 13 progresses, as shown by the dashed line, the journal oil pressure can be adjusted appropriately even when adjusting the journal oil pressure based only on the lift amount.

[0066] As shown in Figure 8(a), after the grinding roller 13 has worn down, the distance (gap amount δ) between the grinding roller 13 and the grinding table 12 increases due to the wear, so if the operating conditions of the mill 10 are the same, the measured lift amount of the grinding roller 13 will be smaller than the state before the wear began. Therefore, even if the type of solid fuel changes at time P5 and a solid fuel with low pulverizability is pulverized, the lift amount of the crushing roller 13 may not exceed the set value of the lift amount of the crushing roller 13 even if it increases. In such a case, as shown by the dashed line, if the journal oil pressure is adjusted based only on the lift amount, the journal oil pressure is adjusted to be lower than the base pressure. Therefore, even if a solid fuel with low pulverizability is actually being pulverized, the pulverization will be performed at a journal oil pressure lower than the base pressure, which may result in the solid fuel not being pulverized properly.

[0067] On the other hand, in this embodiment, the crushing load applied to the crushing roller 13 is adjusted based on the crushing property of the solid fuel, the amount of fluctuation in the average lift amount of the crushing roller 13, the difference in the lift amount (swing amplitude), and the fluctuation period of the lift amount. As described above, the crushing property of the solid fuel, the amount of fluctuation in the average lift amount, and the difference in the lift amount (swing amplitude) are not easily affected by wear of the crushing roller 13 and the crushing table 12. As a result, even after wear has progressed, as shown by the solid line in Fig. 8(b), when the type of solid fuel changes at time P5 and solid fuel with low pulverizability begins to be pulverized, the journal oil pressure can be appropriately increased. Therefore, as shown by the solid line in Fig. 8(a), an increase in the lift amount of the crushing roller 13 can be suppressed. Furthermore, at time P6, when the type of solid fuel changes and a solid fuel with high pulverizability is pulverized, the journal oil pressure can be appropriately reduced, thereby suppressing a decrease in the lift amount of the crushing roller 13, as shown by the solid line in Figure 8(a).

[0068] The present disclosure is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present disclosure. For example, in the above embodiment, an example was described in which the grinding load (hereinafter referred to as "journal oil pressure" or "hydraulic pressure") applied by the load applying unit 49 to the grinding roller 13 was adjusted based on the grindability of the solid fuel, the amount of fluctuation in the average lift amount of the grinding roller 13, the amount of vibration of the mill 10, the difference in lift amount (swing amplitude), and the fluctuation period of the lift amount, but the present disclosure is not limited to this. For example, the grinding load may be adjusted based only on the fluctuation period of the lift amount calculated by the period calculating unit 57. Alternatively, the grinding load may be adjusted based only on the amount of vibration of the mill 10 detected by the vibration detecting unit 62.

[0069] In the above embodiment, the change determination unit 55 determines whether the type of solid fuel has changed based on the amount of change in the average lift amount and the difference in the lift amount, but the present disclosure is not limited to this. For example, the change determination unit 55 may determine whether the type of solid fuel has changed based only on the amount of change in the average lift amount.

[0070] Furthermore, a modified example of the above embodiment will be described. Note that the modified example includes almost the same components as those in the above embodiment, and the same reference numerals will be used to describe components with the same configuration or performing the same processing, and different reference numerals will be used to describe only different components.

[0071] An information processing device 300 shown in FIG. 9 as a device that executes each process in the control unit 50 of the above-described embodiment can be connected to the control unit 50 in a cloud environment or via a VPN (Virtual Private Network) so as to be able to communicate with the control unit 50.

[0072] In this case, as shown in FIG. 10, the control unit 50 can be configured to include a data relay unit 304, and the information processing device 300 can be configured to include a data transmission / reception unit 306, an average value calculation unit 51, an average value monitoring unit 52, a difference calculation unit 53, a difference monitoring unit 54, a change determination unit 55, a load adjustment unit 56, a period calculation unit 57, and a memory unit 58.

[0073] The data relay unit 304 relays information regarding the lift amount of the grinding roller 13 detected continuously or intermittently by the lift amount detection unit 61 and information regarding the vibration of the mill 10 detected continuously or intermittently by the vibration detection unit 62, and transmits it to the data transmission / reception unit 306 of the information processing device 300.

[0074] Then, using the information regarding the lift amount of the crushing roller 13 and the information regarding the vibration of the mill 10 received by the data transmission / reception unit 306, the respective processes in the above-mentioned units are executed.

[0075] Furthermore, the load adjustment unit 56 transmits information to the data relay unit 304 via the data transmission / reception unit 306 for adjusting the crushing load applied by the load application unit (pressing device) 49 to the crushing roller 13 based on the crushability of the solid fuel determined by the change determination unit 55, the lift amount of the crushing roller 13, the difference calculated by the difference calculation unit 53, the period calculated by the period calculation unit 57, and the vibration amount of the mill 10 detected by the vibration detection unit 62.

[0076] Then, the control unit 50 adjusts the crushing load applied by the load applying unit 49 to the crushing roller 13 based on the received information for adjusting the crushing load applied to the crushing roller 13 .

[0077] Furthermore, if it becomes necessary to adjust the crushing load applied to the crushing roller 13 by the load adjustment unit 56, information indicating that adjustment is necessary can be displayed on the terminal 302, and the operator can refer to the displayed content and decide whether or not to issue an instruction to the load application unit 49 to adjust the crushing load applied to the crushing roller 13.

[0078] If the operator decides to issue an instruction, when the operator issues an operation instruction, the terminal 302 requests the control unit 50 via the data transmission / reception unit 306 to control the load application unit 49 using information for adjusting the crushing load that the load application unit 49 applies to the crushing roller 13.

[0079] Alternatively, the operator may request control of the load applying unit 49 from another device equipped with an application that can give instructions directly to the control unit 50, without giving instructions directly from the terminal 302.

[0080] Furthermore, the information processing device 300 may be configured to execute each process in the information processing device 300 in response to a request from the terminal 302.

[0081] The present invention can be embodied as a control method and a program with respect to the control procedures and processes in the above-described embodiments.

[0082] The devices (solid fuel pulverization device and information processing device), power generation plant, device control method, program, power generation plant system, and power generation plant system control method described in the above-described embodiments can be understood, for example, as follows. The device (solid fuel pulverization device and information processing device) according to one embodiment of the present disclosure includes an average value calculation unit (51) that calculates the average value of the lift amount detected by a lift amount detection unit that detects the lift amount of a pulverization roller (13) that pulverizes solid fuel between the pulverization table (12) and the pulverization table (12) over a predetermined time range, and an average value monitoring unit (52) that monitors the amount of fluctuation in the average value of the lift amount calculated by the average value calculation unit (51).

[0083] In a solid fuel pulverizer, the type of solid fuel supplied may change during operation. Furthermore, the pulverizability (ease of pulverization) of solid fuel varies depending on the type. Therefore, for example, the solid fuel pulverizer may continuously pulverize a solid fuel with high pulverizability, and then continuously pulverize a solid fuel with low pulverizability. Furthermore, the lift amount of the pulverizer roller varies depending on the pulverizability of the solid fuel being pulverized. Specifically, the lift amount of the pulverizer roller tends to be smaller when pulverizing a solid fuel with high pulverizability (solid fuel that is easy to pulverize), and tends to be larger when pulverizing a solid fuel with low pulverizability (solid fuel that is difficult to pulverize). This is because solid fuel with high pulverizability is pulverized to a predetermined particle size or less in a short time and is easily discharged from the solid fuel pulverizer, so the amount of solid fuel remaining in the solid fuel pulverizer is small and the layer of solid fuel formed between the pulverizer table and the pulverizer roller is thin. Furthermore, solid fuel with low pulverizability, in contrast to solid fuel with high pulverizability, is difficult to discharge from the solid fuel pulverizer, so the layer of solid fuel formed between the pulverizer table and the pulverizer roller is thick.

[0084] The above configuration includes an average value calculation unit that calculates the average value of the lift amounts detected by the lift amount detection unit over a predetermined time range, and an average value monitoring unit that monitors the amount of fluctuation in the average value of the lift amounts calculated by the average value calculation unit.When the type of solid fuel being pulverized in the solid fuel pulverization device changes and the lift amount of the pulverization roller continuously changes, the amount of fluctuation in the average value of the lift amount calculated by the average value calculation unit changes.Because the average value monitoring unit monitors the amount of fluctuation in the average value of the lift amount, the above configuration makes it possible to determine that the type of solid fuel being pulverized has changed from the change in the average value of the lift amount.

[0085] Furthermore, in the above configuration, the amount of fluctuation in the average lift amount is monitored. The amount of fluctuation in the average lift amount indicates how much the average lift amount has fluctuated relative to a certain reference point. This makes the amount of fluctuation in the average lift amount less susceptible to the influence of wear on the crushing rollers. Therefore, it is possible to grasp a change in the type of solid fuel while suppressing the influence of wear on the crushing rollers.

[0086] The lift amount of the crushing roller may be the distance between the outer circumferential surface of the crushing roller and the surface of the crushing table.

[0087] In addition, the device (solid fuel pulverization device and information processing device) according to one embodiment of the present disclosure is equipped with a change determination unit (55) that determines whether the type of solid fuel has changed based on the amount of change in the average value of the lift amount calculated by the average value calculation unit (51).

[0088] In the above configuration, the change determining unit can determine whether the type of solid fuel to be pulverized has changed based on the amount of change in the average value of the lift amount. In addition, the change determination unit may determine that the type of solid fuel has changed, for example, if the acquired average lift amount has changed by more than a predetermined threshold value compared to the average lift amount acquired immediately before (i.e., if the amount of change from the average lift amount acquired immediately before is more than a predetermined threshold value).

[0089] In addition, the device (solid fuel pulverization device and information processing device) according to one embodiment of the present disclosure includes a difference calculation unit (53) that calculates the difference between the maximum and minimum values of the lift amount detected by the lift amount detection unit (61) within a predetermined time range, and a difference monitoring unit (54) that monitors the amount of fluctuation in the difference calculated by the difference calculation unit (53).

[0090] The difference between the maximum and minimum lift amounts of the crushing rollers within a predetermined time range varies depending on the solid fuel to be crushed. The above configuration includes a difference calculation unit that calculates the difference between the maximum and minimum values of the lift amount detected by the lift amount detection unit, and a difference monitoring unit that monitors the amount of fluctuation in the lift amount difference calculated by the difference calculation unit. When the type of solid fuel being pulverized in the solid fuel pulverization device changes and the lift amount of the pulverization roller continuously changes, the difference between the maximum and minimum values of the lift amount calculated by the difference calculation unit changes. Because the difference monitoring unit monitors the amount of fluctuation in the difference between the maximum and minimum values of the lift amount, the above configuration makes it possible to determine that the type of solid fuel being pulverized has changed from the change in the difference between the maximum and minimum values of the lift amount.

[0091] Furthermore, in the above configuration, the amount of variation in the lift amount difference is monitored. The amount of variation in the lift amount difference indicates how much the lift amount difference has changed relative to a certain reference point. This makes the amount of variation in the lift amount difference less susceptible to the influence of wear on the crushing rollers. Therefore, it is possible to grasp a change in the type of solid fuel while suppressing the influence of wear on the crushing rollers.

[0092] In addition, the device (solid fuel pulverization device and information processing device) according to one embodiment of the present disclosure includes a change determination unit (55) that determines whether the type of solid fuel has changed based on the amount of change in the average value of the lift amount calculated by the average value calculation unit (51) and the amount of change in the difference between the maximum and minimum values of the lift amount calculated by the difference calculation unit (53).

[0093] In the above configuration, the change determining unit can determine whether the type of solid fuel to be pulverized has changed. In addition, since the determination of whether the type of solid fuel has changed is based on both the amount of change in the average lift amount and the amount of change in the difference between the maximum and minimum values of the lift amount, a more accurate determination can be made compared to when the determination is based on only one of them. In addition, the change determination unit may determine that the type of solid fuel has changed, for example, if the average value of the lift amount and / or the difference between the maximum and minimum values of the lift amount have changed by more than a predetermined threshold value compared to the average value and / or difference of the lift amount obtained immediately before.

[0094] In addition, the device (solid fuel pulverization device and information processing device) according to one embodiment of the present disclosure includes a difference calculation unit (53) that calculates the difference between the maximum and minimum values of the lift amount detected by the lift amount detection unit (61) within a predetermined time range, and a load adjustment unit (56) that adjusts the crushing load applied to the crushing roller (13) so as to press it against the crushing table (12) based on the difference calculated by the difference calculation unit (53).

[0095] In the above configuration, the load applying unit adjusts the crushing load applied to the crushing roller based on the difference calculated by the difference calculating unit, thereby making it possible to apply an appropriate crushing load to the crushing roller, thereby making it possible to crush the solid fuel in an appropriate manner. If the difference is smaller than a predetermined threshold, the load adjustment unit may determine that an excessively large crushing load is being applied and adjust the crushing load to be smaller, and if the difference is larger than a predetermined threshold, the load adjustment unit may determine that the crushing load is insufficient and adjust the crushing load to be larger. In addition, if the device (solid fuel pulverization device and information processing device) is equipped with a change determination unit, the change determination unit may determine the pulverizability of the solid fuel. In this case, the load adjustment unit may adjust the pulverization load based not only on the difference but also on the pulverizability determined by the change determination unit. For example, the change determination unit may determine that the pulverizability of the solid fuel to be pulverized is low if the average lift amount of the rollers increases by a predetermined threshold or more compared to the average lift amount obtained immediately before. Furthermore, the change determination unit may determine that the pulverizability of the solid fuel to be pulverized is high if the average lift amount of the rollers decreases by a predetermined threshold or more compared to the average lift amount obtained immediately before.

[0096] In addition, the device (solid fuel pulverization device and information processing device) according to one embodiment of the present disclosure includes a period calculation unit (57) that calculates the period of the fluctuation in the lift amount detected by the lift amount detection unit (61), and the load adjustment unit (56) adjusts the pulverization load based on the period calculated by the period calculation unit (57).

[0097] In the above configuration, the load applying unit adjusts the crushing load applied to the crushing roller based on not only the difference calculated by the difference calculating unit but also the period of the fluctuation in the lift amount calculated by the period calculating unit. This allows a more appropriate crushing load to be applied to the crushing roller, thereby more effectively crushing the solid fuel.

[0098] In addition, in the device (solid fuel pulverization device and information processing device) according to one embodiment of the present disclosure, the load adjustment unit (56) adjusts the pulverization load based on vibrations detected by a vibration detection unit (62) that detects vibrations of the pulverization unit that pulverizes the solid fuel.

[0099] In the above configuration, the crushing load applied to the crushing roller is adjusted based not only on the difference calculated by the difference calculation unit but also on the vibration of the solid fuel crushing device detected by the vibration detection unit. This allows a more appropriate crushing load to be applied to the crushing roller, thereby more effectively crushing the solid fuel.

[0100] In addition, an apparatus (solid fuel pulverization apparatus and information processing apparatus) according to one embodiment of the present disclosure includes any of the apparatuses (100) described above, a boiler (200) that burns the pulverized solid fuel to generate steam, and a power generation unit that generates electricity using the steam generated by the boiler (200).

[0101] In addition, a control method for an apparatus for pulverizing solid fuel according to one embodiment of the present disclosure includes an average value calculation step of calculating an average value of the lift amount detected by a lift amount detection unit (61) that detects the lift amount of the crushing roller (13) that crushes the solid fuel between the crushing table (12) and the apparatus over a predetermined time range, and an average value monitoring step of monitoring the amount of fluctuation in the average value of the lift amount calculated in the average value calculation step.

[0102] Furthermore, a program according to one aspect of the present disclosure is a program for causing a computer to function as an average value calculation means for calculating an average value of the lift amount detected by the lift amount detection unit (61) that detects the lift amount of the crushing roller (13) that crushes the solid fuel between the crushing table (12) and the lift amount detection unit (61), over a predetermined time range, and an average value monitoring means for monitoring the amount of fluctuation in the average value of the lift amount calculated by the average value calculation means.

[0103] Furthermore, a power generation plant system according to one aspect of the present disclosure is a power generation plant system in which a terminal (302) and an apparatus (300) can communicate with each other, and the apparatus (300) includes an average value calculation unit (51) that calculates an average value of the lift amount detected by a lift amount detection unit (61) that detects the lift amount of a grinding roller (13) that grinds solid fuel between the grinding table (12) in response to a request from the terminal (302), over a predetermined time range, and an average value monitoring unit (52) that monitors the amount of fluctuation in the average value of the lift amount calculated by the average value calculation unit (51).

[0104] Furthermore, a control method for a power plant system according to one embodiment of the present disclosure is a control method for a power plant system in which a terminal (302) and a device (300) can communicate with each other, and the device (300) executes, in response to a request from the terminal (302), an average value calculation step of calculating an average value of the lift amount detected by a lift amount detection unit (61) that detects the lift amount of a crushing roller (13) that crushes solid fuel between the crushing table (12) and the device (300), over a predetermined time range, and an average value monitoring step of monitoring the amount of fluctuation in the average value of the lift amount calculated by the average value calculation step (51). [Explanation of symbols]

[0105] 1: Power plant 10: Mill 11: Housing 12: Grinding table 13: Crushing roller 14: Drive unit 15: Mill motor 16: Rotary classifier 16a: Blade 17:Fuel supply section 18: Classifier motor 19: Exit port 20:Coal feeding machine 21: Banka 22: Transport unit 23: Coal feeder motor 24: Downspout 30: Blower 30a: Hot gas flow path 30b: Cold gas flow path 30c: Thermal gas damper 30d: Cold gas damper 31: Primary air ventilator 32: Forced ventilation fan 34:Heat exchanger 40: Status detection unit 41: Bottom part 42: Ceiling 45: Journal head 47: Support arm 48: Support shaft 49: Load applying unit (pressing device) 50: Control unit 51: Average value calculation unit 52: Average value monitoring unit 53: Difference calculation part 54: Difference monitoring section 55: Change determination unit 56: Load adjustment section 57: Period calculation section 58: Storage section 61: Lift amount detection unit 62: Vibration detection unit 100: Solid fuel crusher 100a: Primary air flow path 100b: Pulverized fuel supply passage 200: Boiler 210: Furnace 220: Burner 300: Information processing device 302: Terminal 304: Data relay unit 306: Data transmission and reception unit

Claims

1. an average value calculation unit that calculates an average value of lift amounts detected by a lift amount detection unit that detects lift amounts of the crushing rollers that crush the solid fuel between the crushing rollers and the crushing table, the lift amounts varying with the progress of wear of the crushing rollers and the crushing table, over a predetermined time range; an average value monitoring unit that monitors the amount of fluctuation in the average value of the lift amount calculated by the average value calculation unit.

2. 2. The device according to claim 1, further comprising a change determining unit that determines whether the type of the solid fuel has changed based on the amount of change in the average value of the lift amount calculated by the average value calculating unit.

3. a difference calculation unit that calculates a difference between a maximum value and a minimum value of the lift amount detected by the lift amount detection unit within a predetermined time range; The apparatus according to claim 1 , further comprising: a difference monitoring unit that monitors a fluctuation amount of the difference calculated by the difference calculation unit.

4. The device according to claim 3, further comprising a change determination unit that determines whether the type of the solid fuel has changed based on the amount of change in the average value of the lift amount calculated by the average value calculation unit and the amount of change in the difference between the maximum and minimum values of the lift amount calculated by the difference calculation unit.

5. a difference calculation unit that calculates a difference between a maximum value and a minimum value of the lift amount detected by the lift amount detection unit within a predetermined time range; 5. The apparatus according to claim 1, further comprising: a load adjustment unit that adjusts a crushing load applied to the crushing roller so as to press the crushing roller against the crushing table based on the difference calculated by the difference calculation unit.

6. a period calculation unit that calculates a period of fluctuation in the lift amount detected by the lift amount detection unit; The apparatus according to claim 5 , wherein the load adjusting unit adjusts the crushing load based on the period calculated by the period calculating unit.

7. 7. The device according to claim 5, wherein the load adjusting unit adjusts the crushing load based on vibrations detected by a vibration detecting unit that detects vibrations of a crushing unit that crushes the solid fuel.

8. An apparatus according to any one of claims 1 to 7; a boiler that burns the pulverized solid fuel to generate steam; a power generation unit that generates electricity using the steam generated by the boiler.

9. 1. A method of controlling an apparatus for pulverizing solid fuel, comprising: The device comprises: an average value calculation step of calculating an average value of lift amounts detected by a lift amount detection unit that detects lift amounts of the crushing rollers that crush the solid fuel between the crushing rollers and the crushing table, the lift amounts varying with the progress of wear of the crushing rollers and the crushing table, within a predetermined time range; an average value monitoring step of monitoring the amount of fluctuation in the average value of the lift amount calculated in the average value calculation step; and a method of controlling an apparatus that executes this step.

10. Computer, an average value calculation means for calculating an average value of the lift amount detected by a lift amount detection unit for detecting the lift amount of the crushing roller that crushes the solid fuel between the crushing roller and the crushing table, the lift amount changing with the progress of wear of the crushing roller and the crushing table, within a predetermined time range; a program for causing the program to function as an average value monitoring means for monitoring the amount of fluctuation in the average value of the lift amount calculated by the average value calculation means;

11. A power plant system in which a terminal and a device can communicate with each other, The device comprises: an average value calculation unit that calculates an average value of lift amounts detected by a lift amount detection unit that detects lift amounts of the crushing rollers that crush the solid fuel between the crushing rollers and the crushing table, the lift amounts varying with the progress of wear of the crushing rollers and the crushing table, in response to a request from the terminal; and an average value monitoring unit that monitors the amount of fluctuation in the average value of the lift amount calculated by the average value calculation unit.

12. A control method for a power plant system in which a terminal and a device can communicate, comprising: The device comprises: an average value calculation step of calculating an average value of lift amounts detected by a lift amount detection unit, which detects the lift amounts of the crushing rollers that crush the solid fuel between the crushing rollers and the crushing table, over a predetermined time range, in response to a request from the terminal; and an average value monitoring step of monitoring the amount of fluctuation in the average value of the lift amount calculated in the average value calculation step.

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