Crushing roller and solid fuel crushing device and manufacturing method of crushing roller

Abstract

A pulverizing roller has a ring-shaped roller portion (49) fitted to the outer peripheral portion of the journal housing from the outside, and pulverizes solid fuel between the roller portion and a pulverizing table. The roller portion (49) has a first portion (49A) and a second portion (49B) arranged in the axial direction in alignment with the first portion (49A) and fixed to the first portion (49A). The first portion (49A) has a first base portion (51A) fitted to the outer peripheral portion of the journal housing from the outside, and a first ceramic portion (52A) provided to the outer peripheral surface of the first base portion (51A) and having superior wear resistance to the first base portion (51A). The second portion (49B) has a second base portion (51B) fitted to the outer peripheral portion of the journal housing from the outside, and a second ceramic portion (52B) provided to the outer peripheral surface of the second base portion (51B) and having superior wear resistance to the second base portion (51B).

Description

Technical Field

[0001] This disclosure relates to a crushing roller, a solid fuel crushing apparatus, and a method for manufacturing the crushing roller. Background Technology

[0002] Traditionally, solid fuels such as biomass fuels or coal are pulverized into fine powder within a predetermined particle size range using a mill and then supplied to a combustion unit. The mill pulverizes the solid fuel fed into the pulverizing platform by clamping it between the platform and the pulverizing rollers. A classifier separates the pulverized solid fuel within the predetermined particle size range. Primary air, supplied from the outer periphery of the pulverizing platform, is then used to transport the pulverized fuel to a boiler for combustion in the combustion unit. In thermal power generation equipment, steam is generated through heat exchange with the combustion gases 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] Such mills are disclosed, for example, in Patent Document 1 and Patent Document 2.

[0004] Patent Document 1 discloses a mill comprising a grinding roller having a base made of high-chromium cast iron that fits into a journal housing and a hardened portion on the outer peripheral surface of the base that partially comprises a ceramic component.

[0005] Furthermore, Patent Document 2 discloses a vertical mill comprising: a worktable having a rotation axis extending in the vertical direction; and a plurality of rollers disposed on the upper surface of the worktable. The roller assembly includes: a mounting member rotatably mounted to a support shaft via a bearing subjected to radial force; a first sector member smoothly mounted relative to the axis of the support shaft of the mounting member on its outer circumferential surface in the radial direction, and having a tapered surface that tapers towards the outer radial direction of the worktable; and a second sector member having a tapered surface with a shape corresponding to the tapered surface of the first sector member. The first sector member and the second sector member are respectively fixed to the mounting member by mounting bolts, integrally forming a roller.

[0006] Existing technical documents

[0007] Patent Document 1: Japanese Patent Application Publication No. 2020-11164

[0008] Patent Document 2: Japanese Patent Application Publication No. 62-204862 Summary of the Invention

[0009] The problem that the invention aims to solve

[0010] As described above, there are ceramic-embedded crushing rollers installed in mills, in which a ceramic with high wear resistance is embedded in the outer periphery of the base of the crushing roller at the part in contact with solid fuel. Compared with conventional crushing rollers, such ceramic-embedded crushing rollers have superior wear resistance and allowable wear, and can achieve a long service life.

[0011] The ceramic-embedded crushing roller has a problem that, for ease of manufacturing, the ceramic portion cannot be symmetrically arranged with reference to a plane orthogonal to the roller's rotation axis. Therefore, in ceramic-embedded crushing rollers, as described in Patent Document 1, the ceramic portion is arranged off-center in the direction of the roller's rotation axis.

[0012] This problem will be explained in detail. In manufacturing a ceramic-embedded crushing roller, molten metal is first poured into the mold while a ceramic block is positioned at a predetermined location within the mold. Then, the metal within the mold is cooled and solidified. This creates a ceramic-embedded crushing roller where the ceramic portion (containing the ceramic) and the base (not containing the ceramic) are integrally fixed. The ceramic portion is lighter than the molten metal, thus experiencing buoyancy in the molten metal during roller casting. During casting, this buoyancy is utilized to fix the ceramic portion at a predetermined position on the upper part of the mold. At this time, it is necessary to position the center of buoyancy of the ceramic portion close to one side of the roller (e.g., the outer circumference) to prevent the ceramic portion from tilting to the other side (e.g., the inner circumference) during casting. Therefore, after completion, the ceramic portion is also biased to one side. For this reason, it is difficult to symmetrically arrange the ceramic portion of the ceramic-embedded roller.

[0013] However, wear on the crushing roller sometimes occurs more on one side than the other in the direction of the roller's rotation axis. Therefore, sometimes the crushing roller experiences progressive wear on one side while the other side shows little wear. In such cases, the crushing roller is sometimes reversed for use. That is, the roller section is sometimes removed, reversed by swapping one side with the other, and then reinstalled for use.

[0014] When the crushing roller is used in reverse, if the ceramic portion is arranged to one side as described in Patent Document 1, the solid fuel is crushed using the portion without the ceramic portion after reversal. Therefore, wear is more likely to occur after reversal, and the lifespan of the crushing roller may be reduced.

[0015] Furthermore, Patent Document 2 describes a roller that integrates a first sector member and a second sector member by fixing them together with bolts. However, the roller described in Patent Document 2 is not a ceramic-embedded roller. Therefore, Patent Document 2 does not consider constructing a roller by integrating multiple components in a ceramic-embedded roller.

[0016] This disclosure is made in view of the following circumstances, and its object is to provide a crushing roller and a solid fuel crushing apparatus that can suppress wear on the roller and extend the life of the roller even when the roller is used in reverse. It also includes a method for manufacturing the crushing roller.

[0017] Methods for solving problems

[0018] To solve the above-mentioned problems, the crushing roller, solid fuel crushing apparatus, and manufacturing method of the crushing roller disclosed herein employ the following means.

[0019] According to one aspect of this disclosure, a pulverizing roller is housed inside a housing. Solid fuel is sandwiched between the pulverizing roller and a rotating pulverizing table to pulverize the solid fuel. The pulverizing roller is rotated by a rotational force from the pulverizing table. The pulverizing roller includes: a support portion supported to rotate relative to the housing about a rotational axis; and an annular roller portion fitted from the outside of the outer periphery of the support portion to pulverize the solid fuel between the roller portion and the pulverizing table. The roller portion includes: a first portion; and a second portion arranged along an axial direction with the first portion and fixed to the first portion, wherein the axial direction is the rotational center of the roller portion. In the direction of axial extension, the first part has: a first base portion that is fitted from the outside to the outer periphery of the support portion; and a first outer periphery portion disposed on the outer periphery surface of the first base portion, wherein the wear resistance of the first outer periphery portion is superior to that of the first base portion, and the first part is disposed on one side relative to the center line in the axial direction. The second part has: a second base portion that is fitted from the outside to the outer periphery of the support portion; and a second outer periphery portion disposed on the outer periphery surface of the second base portion, wherein the wear resistance of the second outer periphery portion is superior to that of the second base portion, and the second part is disposed on the other side relative to the center line in the axial direction.

[0020] In a method for manufacturing a pulverizing roller according to one aspect of this disclosure, the pulverizing roller is housed inside a housing. Solid fuel is sandwiched between the pulverizing roller and a rotating pulverizing table to pulverize the solid fuel. The pulverizing roller is rotated by a rotational force from the pulverizing table. The pulverizing roller includes: a support portion supported to rotate relative to the housing about a rotational central axis; and an annular roller portion fitted from the outside of the outer periphery of the support portion to pulverize the solid fuel between the roller portion and the pulverizing table. The roller portion includes: a first portion; and a second portion arranged and fixed to the first portion along an axial direction, the axial direction being the direction in which the rotational central axis of the roller portion extends. The first portion has: a first base portion, from... The second part comprises: an outer peripheral portion fitted to the support portion from the outside; and a first outer peripheral portion disposed on the outer peripheral surface of the first base portion, wherein the wear resistance of the first outer peripheral portion is superior to that of the first base portion, and the first part is disposed on one side relative to the center line in the axial direction; the second part comprises: a second base portion fitted to the outer peripheral portion of the support portion from the outside; and a second outer peripheral portion disposed on the outer peripheral surface of the second base portion, wherein the wear resistance of the second outer peripheral portion is superior to that of the second base portion, and the second part is disposed on the other side relative to the center line in the axial direction; the manufacturing method of the crushing roller comprises the following steps: a step of manufacturing the first part; a step of manufacturing the second part; and a step of fixing the first part and the second part.

[0021] Invention Effects

[0022] According to this disclosure, even when the rollers are used in reverse, wear on the rollers can be suppressed and the life of the rollers can be extended. Attached Figure Description

[0023] Figure 1 This is a structural diagram illustrating a solid fuel pulverizing apparatus and a boiler according to embodiments of the present disclosure.

[0024] Figure 2 This is a schematic side view of a pulverizing roller disposed in a solid fuel pulverizing apparatus according to an embodiment of the present disclosure.

[0025] Figure 3 This is a cross-sectional view of the main part of the crushing roller according to an embodiment of the present disclosure.

[0026] Figure 4 This is a schematic diagram showing the mold for manufacturing the crushing roller according to the embodiments of the present disclosure.

[0027] Figure 5 This is a schematic diagram showing a mold for manufacturing a modified example of a crushing roller according to an embodiment of the present disclosure.

[0028] Figure 6 This is a cross-sectional view of the main part of the crushing roller, which is a modified embodiment of the present disclosure.

[0029] Figure 7 This is a cross-sectional view of the main part of the crushing roller, which is a modified embodiment of the present disclosure.

[0030] Figure 8 This is a cross-sectional view of the main part of the crushing roller, which is a modified embodiment of the present disclosure.

[0031] Figure 9 This is a cross-sectional view of the main part of the crushing roller, which is a modified embodiment of the present disclosure. Detailed Implementation

[0032] Hereinafter, an embodiment of the crushing roller, solid fuel crushing apparatus, and manufacturing method of the crushing roller of the present disclosure will be described with reference to the accompanying drawings.

[0033] The power generation equipment 1 of this embodiment includes a solid fuel pulverizing device 100 and a boiler 200.

[0034] In the following explanations, "above" refers to the direction above the plumb line, and "upper part" and "upper surface" refer to the portion above the plumb line. Similarly, "below" refers to the portion below the plumb line. The plumb line direction is not strictly defined and includes errors.

[0035] As an example, the solid fuel pulverizing apparatus 100 of this embodiment is an apparatus that pulverizes solid fuels such as biomass fuel or coal to generate micro-powdered fuel and supplies it to the burner (combustion device) 220 of the boiler 200.

[0036] Figure 1 The power generation equipment 1 shown includes a solid fuel pulverizer 100 and a boiler 200. It has one solid fuel pulverizer 100, but it can also be configured as a system with multiple solid fuel pulverizers 100 corresponding to multiple burners 220 of a boiler 200.

[0037] The solid fuel pulverizing apparatus 100 of this embodiment includes: a mill (pulverizing unit) 10, a hopper (storage unit) 21, a coal feeder (fuel feeder) 25, an air supply unit (gas supply unit for conveying) 30, a status detection unit 40, and a control unit 50.

[0038] The mill 10 that crushes solid fuels such as coal or biomass fuel supplied to boiler 200 into fine powder, i.e., fine powder fuel, can be in the form of crushing only coal, crushing only biomass fuel, or crushing biomass fuel and coal together.

[0039] Here, biomass fuel refers to renewable organic resources derived from living organisms, such as thinned timber, waste wood, driftwood, grass, waste, sludge, tires, and recycled fuels (pellet or fragments) made from them, and is not limited to the substances mentioned herein. Biomass fuel absorbs carbon dioxide during the growth of biomass, thus achieving carbon neutrality by preventing the emission of carbon dioxide, a greenhouse gas on Earth, and therefore its utilization has been the subject of various studies.

[0040] The mill 10 includes: a housing 11, a crushing table 12, a crushing roller 13, a reducer (drive transmission unit) 14, a mill motor (drive unit) 15 connected to the reducer 14 and driving the crushing table 12 to rotate, a rotary classifier (classification unit) 16, a coal supply pipe (fuel supply unit) 17, and a classifier motor 18 that drives the rotary classifier 16 to rotate.

[0041] The housing 11 is formed as a cylinder extending in the vertical direction and is a box housing the crushing table 12, the crushing roller 13, the rotary classifier 16, and the coal supply pipe 17.

[0042] A coal supply pipe 17 is installed at the center of the top 42 of the housing 11. The coal supply pipe 17 supplies solid fuel from the hopper 21 via the coal feeder 25 into the housing 11. It is arranged vertically at the center of the housing 11 and extends into the interior of the housing 11 at its lower end.

[0043] A speed reducer 14 is provided near the bottom part 41 of the housing 11, and the grinding table 12, which rotates by the driving force transmitted from the mill motor 15 connected to the speed reducer 14, is configured to rotate freely.

[0044] The crushing table 12 is a circular component when viewed from above, and is arranged facing the lower end of the coal supply pipe 17. The upper surface of the crushing table 12 may, for example, be a sloping shape with a low center that increases towards the outer edge, and bends upward at the outer periphery. The coal supply pipe 17 supplies solid fuel (e.g., coal or biomass fuel in this embodiment) from above to the crushing table 12 below, and the crushing table 12 clamps the supplied solid fuel between itself and the crushing roller 13 for crushing.

[0045] When solid fuel is fed from the coal supply pipe 17 into the center of the crushing table 12, the centrifugal force generated by the rotation of the crushing table 12 guides the solid fuel to the outer periphery of the crushing table 12, where it is crushed between the crushing table 12 and the crushing roller 13. The crushed solid fuel is then blown upward by the conveying gas (hereinafter referred to as primary air) from the conveying gas path (hereinafter referred to as primary air) 110 and guided towards the rotary classifier 16.

[0046] An outlet (not shown) is provided on the outer periphery of the pulverizing table 12, through which primary air flowing in from the primary air flow path 110 exits into the space above the pulverizing table 12 within the housing 11. A gyratory blade (not shown) is provided at the outlet to impart a gyratory force to the primary air blown out from the outlet. The primary air imparted with gyratory force by the gyratory blade becomes an airflow with a gyratory velocity component, conveying the pulverized solid fuel on the pulverizing table 12 to the rotary classifier 16 located above within the housing 11. Furthermore, solid fuel particles larger than a predetermined particle size in the pulverized solid fuel are classified by the rotary classifier 16, or, if they do not reach the rotary classifier 16, fall back onto the pulverizing table 12 and are pulverized again between the pulverizing table 12 and the pulverizing roller 13.

[0047] The crushing roller 13 is a rotating body that crushes solid fuel supplied from the coal supply pipe 17 to the crushing table 12. The crushing roller 13 presses against the upper surface of the crushing table 12 and works with the crushing table 12 to crush the solid fuel.

[0048] exist Figure 1 In this example, only one crushing roller 13 is shown as an example, but multiple crushing rollers 13 are arranged at certain intervals in the circumferential direction in a manner that presses against the upper surface of the crushing table 12. For example, three crushing rollers 13 are arranged at equal intervals in the circumferential direction at 120° intervals on the outer periphery. In this case, the portions of the three crushing rollers 13 that contact the upper surface of the crushing table 12 (the pressing portions) are equidistant from the rotational center axis of the crushing table 12.

[0049] The crushing roller 13 is able to swing up and down and move through the journal head 43, and is supported so as to be nearly and freely separated from the upper surface of the crushing table 12. When the crushing roller 13 is in contact with the solid fuel on the upper surface of the crushing table 12, it rotates along with the crushing table 12 due to the rotational force acting on it. When solid fuel is supplied from the coal supply pipe 17, the solid fuel is pressed and crushed between the crushing roller 13 and the crushing table 12. This pressing force is called the crushing load.

[0050] The middle portion of the support arm 44 of the journal head 43 is supported on the side of the housing 11 by a support shaft 45 along the horizontal direction, so that the crushing roller 13 can swing and move vertically around the support shaft 45. Furthermore, a pressing device (crushing load application part) 46 is provided at the upper end of the support arm 44 on the vertical side. The pressing device 46 is fixed to the housing 11 and applies a crushing load to the crushing roller 13 via the support arm 44, etc., by pressing the crushing roller 13 against the crushing table 12. The crushing load is applied, for example, by a hydraulic cylinder (not shown) operated by the pressure of working oil supplied from a hydraulic device (not shown) located outside the mill 10. Alternatively, the crushing load can also be applied by the restoring force of a spring (not shown).

[0051] The reducer 14 is connected to the mill motor 15 and transmits the driving force of the mill motor 15 to the crushing table 12, causing the crushing table 12 to rotate around the central axis.

[0052] A rotary classifier (classification section) 16 is disposed on the upper part of the housing 11 and has a hollow, inverted conical shape. The rotary classifier 16 has a plurality of blades 16a extending in the vertical direction on its outer periphery. Each blade 16a is arranged around the central axis of the rotary classifier 16 at a predetermined interval (equal interval).

[0053] The rotary classifier 16 is a device for classifying solid fuel (hereinafter, the pulverized solid fuel is referred to as "pulverized fuel") pulverized by the pulverizing table 12 and the pulverizing roller 13 into fuel with a particle size larger than a predetermined particle size (e.g., 70 μm to 100 μm in the case of coal) (hereinafter, pulverized fuel exceeding the predetermined particle size is referred to as "coarse fuel") and fuel with a particle size smaller than the predetermined particle size (hereinafter, pulverized fuel smaller than the predetermined particle size is referred to as "fine fuel"). The rotary classifier 16 is given rotational driving force by a classifier motor 18 controlled by the control unit 50, and rotates around the coal supply pipe 17 with a cylindrical shaft (not shown) extending in the vertical direction along the housing 11 as the center.

[0054] Alternatively, a fixed classifier may be used as the grading unit, which has a fixed hollow inverted conical shell and multiple fixed swirling blades that replace the blades 16a at the outer periphery of the shell.

[0055] The pulverized fuel arriving at the rotary classifier 16 is relatively balanced by the centrifugal force generated by the rotation of the blades 16a and the centripetal force generated by the airflow of the primary air. Larger diameter coarse fuel is knocked off by the blades 16a and returns to the pulverizing table 12 for further pulverization, while fine fuel is guided to the outlet port 19 located at the top 42 of the housing 11. The fine fuel classified by the rotary classifier 16, together with the primary air, is discharged from the outlet port 19 into the fine fuel supply path (fine fuel supply pipe) 120 and supplied to the burner 220 of the boiler 200.

[0056] The coal supply pipe (fuel supply section) 17 is installed by extending its lower end into the interior of the housing 11 in a vertical direction through the top 42 of the housing 11, and supplies solid fuel from the upper part of the coal supply pipe 17 to the center of the crushing worktable 12. A coal feeder 25 is connected to the upper end of the coal supply pipe 17 and is supplied with solid fuel.

[0057] The coal feeder 25 is connected to the hopper 21 via a downcomer section 22 extending vertically from the lower end of the hopper 21. A valve (call gate, not shown) for switching the discharge state of solid fuel from the hopper 21 may also be installed midway through the downcomer section 22. The coal feeder 25 includes a conveyor section 26 and a coal feeder motor 27. The conveyor section 26, for example, is a belt conveyor, which, driven by the coal feeder motor 27, conveys the solid fuel discharged from the lower end of the downcomer section 22 to the upper part of the coal feed pipe 17 and feeds it into the mill 10. The amount of solid fuel supplied to the mill 10 is controlled by adjusting the speed of the belt conveyor in the conveyor section 26, for example, according to a signal from the control unit 50.

[0058] Typically, inside the mill 10, primary air is supplied to deliver the pulverized fuel to the burner 220 at a higher pressure than that of the coal feeder 25 and the hopper 21. The interior of the feed pipe section 22, which connects the hopper 21 to the coal feeder 25, is in a fuel-stacked state. Through this solid fuel layer, a seal (material seal) is ensured from the mill 10 to the hopper 21 to prevent backflow of primary air and pulverized fuel.

[0059] The air supply unit 30 is a device that supplies primary air, used to dry pulverized fuel and to convey it to the rotary classifier 16, into the interior of the housing 11.

[0060] In order to properly adjust the flow rate and temperature of the primary air blown into the interior of the housing 11, in this embodiment, the air supply unit 30 includes: a primary air fan (PAF) 31, a hot air flow path 30a, a cold air flow path 30b, a hot air damper 30c, and a cold air damper 30d.

[0061] In this embodiment, the hot air flow path 30a supplies a portion of the air delivered from the primary air fan 31 as heated hot air by passing it through an air preheater (heat exchanger) 34. A hot air damper 30c is provided in the hot air flow path 30a. The opening degree of the hot air damper 30c is controlled by the control unit 50. The flow rate of the hot air supplied from the hot air flow path 30a is determined based on the opening degree of the hot air damper 30c.

[0062] The cold air flow path 30b supplies a portion of the air delivered from the primary air fan 31 as ambient temperature cold air. A cold air damper 30d is provided in the cold air flow path 30b. The opening degree of the cold air damper 30d is controlled by the control unit 50. The flow rate of the cold air supplied from the cold air flow path 30b is determined based on the opening degree of the cold air damper 30d.

[0063] In this embodiment, the primary air flow rate is the sum of the flow rates of the hot air supplied from the hot air flow path 30a and the cold air supplied from the cold air flow path 30b. The temperature of the primary air is determined by the mixing ratio of the hot air supplied from the hot air flow path 30a and the cold air supplied from the cold air flow path 30b, and is controlled by the control unit 50.

[0064] Alternatively, the oxygen concentration in the primary air supplied from the primary air path 110 to the interior of the casing 11 can be adjusted by, for example, using a gas recirculation fan (not shown) to guide and mix a portion of the combustion gases discharged from the boiler 200 with the hot air supplied from the hot air path 30a. By adjusting the oxygen concentration in the primary air, for example when using a solid fuel with high ignition (easy to ignite), ignition of the solid fuel can be suppressed in the path from the mill 10 to the burner 220.

[0065] In this embodiment, the data measured or detected by the state detection unit 40 of the mill 10 is sent to the control unit 50. The state detection unit 40 in this embodiment is, for example, a differential pressure measuring unit that measures the pressure difference between the pressure at the portion of primary air flowing from the primary air flow path 110 into the interior of the housing 11 and the pressure at the outlet port 19 of the primary air and the fine fuel discharged from the interior of the housing 11 into the fine fuel supply pipe 120. The increase or decrease of this differential pressure in the mill 10 corresponds to the increase or decrease of the circulation amount of the pulverized fuel circulating between the vicinity of the rotary classifier 16 and the vicinity of the pulverizing 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 the mill 10, the amount and particle size range of the fine fuel discharged from the outlet port 19 can be adjusted. Therefore, the particle size of the fine fuel can be maintained within a range that does not affect the combustibility of the solid fuel in the burner 220, and the amount of fine fuel corresponding to the amount of solid fuel supplied to the mill 10 can be stably supplied to the burner 220 installed in the boiler 200.

[0066] Furthermore, the state detection unit 40 in this embodiment is, for example, a temperature measuring mechanism, which detects the temperature of the primary air supplied to the interior of the housing 11 (mill inlet primary air temperature) and the temperature of the mixture of primary air and pulverized fuel at the outlet port 19 (mill outlet primary air temperature), and controls the air supply unit 30 in a manner that does not exceed their respective upper limit temperatures. Each upper limit temperature is determined taking into account factors such as the ignition possibility corresponding to the properties of the solid fuel. In addition, the primary air is cooled inside the housing 11 by drying the pulverized fuel while being transported; therefore, the primary air temperature at the mill inlet is, for example, from room temperature to approximately 300 degrees Celsius, and the primary air temperature at the mill outlet is, for example, from room temperature to approximately 90 degrees Celsius.

[0067] The control unit 50 is a device that controls the various parts of the solid fuel pulverizing device 100.

[0068] The control unit 50 can also transmit drive instructions to the mill motor 15 to control the rotation speed of the crushing table 12.

[0069] The control unit 50, for example, transmits a drive instruction to the classifier motor 18 to control the rotational speed of the rotary classifier 16 to adjust the classification performance. This allows the particle size of the fine fuel to be maintained within a range that does not affect the combustibility of the solid fuel in the burner 220, and the fine fuel to be stably supplied to the burner 220 in an amount corresponding to the amount of solid fuel supplied to the mill 10.

[0070] In addition, the control unit 50 can, for example, adjust the amount of solid fuel supplied to the mill 10 (coal supply) by transmitting a drive instruction to the coal feeder motor 27.

[0071] Furthermore, the control unit 50 can adjust the primary air flow rate and temperature by controlling the opening of the hot air damper 30c and the cold air damper 30d by transmitting an opening instruction to the air supply unit 30. Specifically, the control unit 50 controls the opening of the hot air damper 30c and the cold air damper 30d so that the primary air flow rate supplied to the interior of the housing 11 and the primary air temperature at the outlet port 19 (mill outlet primary air temperature) are predetermined values ​​set corresponding to the coal supply quantity for each type of solid fuel. In addition, the temperature at the mill inlet (mill inlet primary air temperature) can also be controlled to adjust the primary air temperature.

[0072] The control unit 50 is composed of, for example, a CPU (Central Processing Unit), RAM (Random Access Memory), ROM (Read Only Memory), and a computer-readable storage medium. As an example, a series of processes for implementing various functions are stored in the storage medium in the form of a program. The CPU reads this program into RAM, etc., and performs information processing and arithmetic to achieve various functions. Alternatively, the program can be pre-installed on ROM or other storage media, provided in its current state stored on a computer-readable storage medium, or distributed via a wired or wireless communication unit. Computer-readable storage media include disks, magneto-optical disks, CD-ROMs, DVD-ROMs, semiconductor memories, etc. Furthermore, HDDs can be replaced by solid-state drives (SSDs).

[0073] Next, a boiler 200 that generates steam by burning finely powdered fuel supplied from a solid fuel pulverizing device 100 will be described. The boiler 200 includes a furnace 210 and a burner 220.

[0074] Burner 220 is a device that uses a mixture of pulverized fuel supplied from pulverized fuel supply pipe 120 and primary air, and secondary air supplied by heating air (external gas) delivered from forced draft fan (FDF) 32 using air preheater 34, to burn the pulverized fuel and form a flame. Combustion of the pulverized fuel takes place inside furnace 210, and the high-temperature combustion gases are discharged to the outside of boiler 200 after passing through heat exchangers such as evaporator, superheater, and fuel saver (not shown).

[0075] Combustion gases discharged from boiler 200 undergo predetermined treatment in environmental devices (omitted from illustrations in denitrification, dust collection, and desulfurization units, etc.), and exchange heat with primary and secondary air in air preheater 34. The gases are then guided to the chimney (omitted from illustration) via induced draft fan (IDF) 33 and released to the outside. Air heated by the combustion gases in air preheater 34 and supplied from primary air fan 31 is then fed into the aforementioned hot gas flow path 30a.

[0076] The water supplied to each heat exchanger of boiler 200 is heated in the coal saver (not shown), and then further heated by the evaporator (not shown) and superheater (not shown) to generate high-temperature and high-pressure superheated steam, which is then delivered to the steam turbine (not shown) which serves as the power generation unit to drive the steam turbine to rotate, thereby driving the generator (not shown) connected to the steam turbine to rotate and generate electricity, thus constituting power generation equipment 1.

[0077] Next, refer to Figures 1 to 4 The details of the crushing roller 13 in this embodiment will be described in detail.

[0078] like Figure 1 and Figure 2 As shown, each crushing roller 13 is supported on the housing 11 via a journal shaft 47, a journal head 43, and a support shaft 45, in a manner that allows it to rotate around the rotation center axis C2. The journal shaft 47 extends downward from near the side of the housing 11 toward the center of the housing 11. The base end of the journal shaft 47 (the end on the side of the housing 11) is fixed to the journal head 43. The journal head 43 rotatably supports the crushing roller 13 at its front end (the end on the center of the mill 10) via a bearing (not shown). That is, the crushing roller 13 is supported and able to rotate in a state where its upper part is tilted above the crushing table 12, with its lower part closer to the center of the housing 11 than its lower part.

[0079] like Figure 2 As shown, the crushing roller 13 includes: a journal housing (support part) 48, which is rotatably supported on the front end of the journal shaft 47 about the rotation center axis C2; and an annular roller part 49, which is externally embedded in the journal housing 48. The journal housing 48 is provided to cover the front end of the journal shaft 47, and its outer peripheral surface is formed into a cylindrical shape.

[0080] Figure 3 The main part of the cross section (hereinafter referred to as the "axial direction section") when the roller 49 is cut with a surface extending in the direction of the rotation center axis C2 containing the roller 49.

[0081] The roller portion 49 has a first portion 49A disposed on a base end side in the direction extending from the rotation center axis C2 (hereinafter referred to as the "axial direction"), and a second portion 49B arranged and disposed along the axial direction with the first portion 49A. In other words, the roller portion 49 is divided into a first portion 49A and a second portion 49B in the axial direction. Here, the base end side refers to the side of the journal shaft 47 connecting the crushing roller 13, and is indicated as the outer peripheral side in the radial direction of the crushing table 12. Figure 3 (The right side of the paper in the image), the front side refers to the axis of rotation C1 in the radial direction of the crushing worktable 12 (refer to...). Figure 1 )side( Figure 3(Left side of the paper in the middle).

[0082] The first part 49A and the second part 49B are fixed together with bolts 53. During the operation of the mill 10, the first part 49A and the second part 49B are positioned at different distances from the rotational center axis C1 of the crushing table 12, and therefore are intended to rotate at different circumferential speeds. As a result, shear force is generated at the mating surface between the first part 49A and the second part 49B, causing the first part 49A and the second part 49B to move relative to each other in a sliding manner. If such relative movement occurs, the mating surface will wear due to sliding, therefore it is preferable to fix them in a manner that restricts the relative movement between the first part 49A and the second part 49B.

[0083] The roller section 49 is formed uniformly in the circumferential direction. That is, at any position in the circumferential direction, the cross-section in the axial direction is approximately the same.

[0084] In addition, such as Figure 3 As shown, the outer peripheral surface 49a of the roller portion 49 is curved in the axial direction section in a circular arc shape centered at the center point CP.

[0085] like Figure 3 As shown, the first part 49A and the second part 49B are linearly symmetrical about the center line C3. Therefore, the structure of the first part 49A will be described in detail below, and the structure of the second part 49B will be omitted except for necessary explanations. In addition, the center line C3 refers to the line at the center of the crushing roller 13 in a direction that is orthogonal to the rotation center axis C2 and extends through the rotation center axis C2.

[0086] In this embodiment, the surfaces where the first part 49A and the second part 49B abut overlap with the center line C3.

[0087] like Figure 3 As shown, the first part 49A integrally comprises: a first base 51A made of high-chromium cast iron, which fits into the journal housing 48; and a first ceramic part (outer peripheral part) 52A, which is disposed on the outer peripheral surface of the first base 51A and partially includes ceramic components. That is, the roller part 49 of this embodiment is a so-called ceramic-embedded high-chromium cast iron roller.

[0088] A first base 51A is supported on a journal housing 48. The first base 51A is formed in a generally annular shape. Furthermore, the first base 51A is fitted into the journal housing 48 such that its inner circumferential surface contacts the outer circumferential surface of the journal housing 48. A first ceramic portion 52A is fixed to the outer circumference of the annular first base 51A. The first ceramic portion 52A is provided over approximately the entire circumferential area of ​​the first base 51A. That is, the first ceramic portion 52A is formed in a generally annular shape. Additionally, a bolt hole extending through the axial direction is formed in the first base 51A.

[0089] The outer peripheral surface of the first base 51A is inclined in the axial direction section in such a way that it approaches the rotational center axis C2 as it moves from the center line C3 toward the base end in the axial direction. The inner peripheral surface of the first base 51A is a cylindrical surface.

[0090] In addition, the surface on the second part 49B side of the first base 51A (i.e., the surface that abuts against the second base 51B) is a plane.

[0091] The first ceramic part 52A contains ceramic components, therefore its coefficient of linear expansion is smaller than that of the first base 51A, which is made of high-chromium cast iron. Furthermore, the first ceramic part 52A exhibits superior wear resistance compared to the first base 51A. The materials used for the first base 51A and the first ceramic part 52A are not limited to those described above.

[0092] The first ceramic part 52A is formed in a generally annular shape. The first ceramic part 52A covers the entire area of ​​the outer peripheral surface of the first base 51A from the outside. The inner peripheral surface of the first ceramic part 52A abuts against the outer peripheral surface of the first base 51A. The outer peripheral surface of the first ceramic part 52A is curved in a circular arc shape centered on the center point CP in the axial direction section.

[0093] In addition, the surface of the second part 49B of the first ceramic part 52A (that is, the surface that abuts against the second ceramic part 52B) is a plane.

[0094] Thus, the entire area of ​​the outer peripheral surface of the roller portion 49 in the axial direction is formed by the first ceramic portion 52A and the second ceramic portion 52B.

[0095] Next, the joining method of the first part 49A and the second part 49B will be explained.

[0096] A fixing bolt 53 is used to fix the parts together by connecting a bolt hole 54 formed in the first base 51A of the first part 49A and a bolt hole 54 formed in the second base 51B of the second part 49B. The head 53a of the fixing bolt 53 abuts against the first base 51A. A nut 55, which is screwed onto the front end of the fixing bolt 53, abuts against the second base 51B. Therefore, by tightening the fixing bolt 53 and the nut 55, the first base 51A and the second base 51B are fixed. Thus, the first part 49A and the second part 49B are joined. Alternatively, the fixing bolt 53 and the nut 55 can be a headless bolt and a nut with both ends.

[0097] Figure 2 and Figure 3The dashed line L1 represents the wear progression of the roller 49 as it pulverizes solid fuel by the mill 10. That is, in this embodiment, a portion P1 (hereinafter referred to as "maximum wear point P1") of the roller 49 on the base end side (i.e., the side opposite to the front end side) is more worn than other portions. As described above, the base end side refers to the outer periphery of the pulverizing table 12 in the radial direction, and the front end side refers to the rotation center axis C1 of the pulverizing table 12 (refer to...). Figure 1 ) side. Additionally, Figure 2 The dashed line L2 in the diagram represents the wear progression pattern of the crushing worktable 12. Specifically, the point of maximum wear, P1, is located at the first ceramic section 52A. Furthermore, in... Figure 2 and Figure 3 In the attached diagram, the maximum wear point before wear is indicated by the reference numeral "P1", and the maximum wear point under the actual wear progression state is indicated by the reference numeral "P1′". In other words, the maximum wear point P1 before wear is the point where wear is expected to progress most easily.

[0098] The point of maximum wear, P1, is located on the outer peripheral surface 49a of the roller portion 49 at a predetermined angle θ1 relative to the center line C3 (a line at the center of the crushing roller 13 in a direction orthogonal to the rotation center axis C2 and extending through the rotation center axis C2) towards the base end. More specifically, it is the position where the line L4, which forms a predetermined angle θ1 with the center line C3 at the center point CP, intersects the outer peripheral surface 49a. Figure 3 The angle θ1 in the example is set to 8 degrees, but the angle θ1 is not limited to 8 degrees. The location of the maximum wear point P1 varies, for example, depending on the specifications of the mill 10 and the solid fuel being pulverized, and the angle θ1 mostly occurs in the range of 3 to 13 degrees (plus or minus 5 degrees of 8 degrees).

[0099] Furthermore, in this embodiment, the first ceramic portion 52A in the axial section is thickest in the portion through which the line L4 forms a predetermined angle θ1 with the center line C3.

[0100] in addition, Figure 3 The dashed line L3 in the diagram represents the wear pattern of the roller 49 during the grinding of solid fuel by the mill 10, in the case where the roller 49 is reversed for use after wear as shown by the dashed line L1 (i.e., the roller 49 is temporarily removed from the journal housing 48, the base end side and the front end side are swapped, and the roller 49 is reinstalled in the journal housing 48 for use). In this case, the maximum wear point P2 becomes a symmetrical position with respect to the center line C3. Specifically, the maximum wear point P2 becomes a point on line L5 that is symmetrical to line L4, which forms a predetermined angle θ1 with the center line C3. That is, the maximum wear point P2 during reversal is located in the second ceramic section 52B. In addition, in Figure 2In the attached diagram, the maximum wear point before wear is indicated by the reference numeral "P2", and the maximum wear point under the actual wear progression state is indicated by the reference numeral "P2′". In other words, the maximum wear point P2 before wear is the point where wear is expected to progress most easily.

[0101] In addition, Figure 3 The diagram shows the state where the roller 49 is not reversed. Therefore, in the state where the roller 49 is actually reversed, the second ceramic part 52B is located on the base end side closer to the center line C3. Figure 3 The position is on the right side of the center line C3. Therefore, the maximum wear point P2 is also located on the same side as the maximum wear point P1 before reversal, closer to the base end than the center line C3. Figure 3 (The position on the right side).

[0102] Next, refer to Figure 4 The method for manufacturing the roller section 49 will now be explained. Figure 4 In this context, UP represents "up" in the vertical direction.

[0103] First, when manufacturing the roller section 49, the first part 49A is manufactured first.

[0104] In manufacturing the first part 49A, firstly, ceramic blocks CB (see reference) constituting a part of the first ceramic part 52A are manufactured by shaping ceramic particles into a block shape (the shape corresponding to the first ceramic part 52A). Figure 4 The ceramic block is formed by bonding together particle-like ceramic particles, creating numerous gaps between them. The shape of the ceramic block CB is roughly the same as that of the first ceramic part 52A.

[0105] Next, the manufactured ceramic block CB is placed at a predetermined position within the mold 60. At this time, the ceramic block CB is fixed in the predetermined position by clamping it between the top and bottom surfaces of the mold 60. In this embodiment, the ceramic block CB is clamped between the top and bottom surfaces of the mold 60, and buoyancy is used to fix the ceramic block CB in the predetermined position during casting, as described later.

[0106] Next, the molten metal is allowed to flow from gate 61 through runner 62 into mold 60. Thus, mold 60 is filled with molten metal (see arrow m). At this point, the ceramic block CB is lighter than the molten metal, therefore, as... Figure 4 As shown, the ceramic block CB is pressed against a predetermined position on the inner circumferential surface of the mold 60 by buoyancy (refer to arrow b). Additionally, molten metal flows into the gaps between the ceramic particles formed in the ceramic block CB.

[0107] Next, the molten metal is cooled and solidified. Thus, a roller portion 49 is formed by integrating a first ceramic portion 52A, in which the metal is introduced into the ceramic block CB, exhibiting excellent wear resistance between the ceramic particles, and a first base portion 51A, which is formed solely from the solidified metal.

[0108] Thus, the first part 49A of this embodiment is manufactured by casting the first base 51A and the first ceramic part 52A together. Furthermore, when casting the first part 49A, bolt holes 54 can also be provided through casting holes. The first base 51A has high hardness, making it difficult to form bolt holes 54 after solidification; therefore, by using casting holes, bolt holes 54 can be easily formed.

[0109] Next, the second part 49B is manufactured. The method for manufacturing the second part 49B is the same as that for manufacturing the first part 49A, so the description is omitted.

[0110] Next, the first part 49A and the second part 49B are joined by fastening bolts 53 and nuts 55. In this way, the roller 49 is manufactured. In addition, the joining of the first part 49A and the second part 49B is carried out in the factory. When the joined roller 49 is transported to the assembly mill 10, the on-site assembly time is reduced, thereby reducing the overall cost.

[0111] According to this embodiment, the following effects are achieved.

[0112] In this embodiment, the first portion 49A is located on one side (base end side) relative to the centerline C3 in the axial direction, and the second portion 49B is located on the other side (front end side) relative to the centerline C3 in the axial direction. This allows for the provision of wear-resistant ceramic portions 52 (first ceramic portion 52A and second ceramic portion 52B) on both sides of the roller portion 49. Therefore, even when the roller portion 49 is used in reverse (i.e., the roller portion 49 is disassembled, reversed by swapping one side, and then reinstalled for use), solid fuel can be pulverized between the ceramic portion 52 and the pulverizing table 12, thus suppressing wear on the roller portion 49. Therefore, the lifespan of the roller portion 49 can be extended.

[0113] Furthermore, in this embodiment, the roller portion 49 has a first portion 49A and a second portion 49B. Thus, the first portion 49A and the second portion 49B can be manufactured separately. Therefore, by fixing the separately manufactured first portion 49A and the second portion 49B, ceramic portions 52 (first ceramic portion 52A and second ceramic portion 52B) can be simply provided on one side and the other side in the axial direction.

[0114] Furthermore, since the first part 49A and the second part 49B can be manufactured separately, the volume of the parts manufactured in one operation can be reduced compared to manufacturing the first part 49A and the second part 49B in one operation. Therefore, when manufacturing the first part 49A and the second part 49B by casting, the volume of the parts manufactured in one casting operation can be reduced, thus reducing the amount of molten metal required for one casting operation. Therefore, the molten metal furnace for manufacturing the molten metal can be miniaturized. This allows for space-saving design of the equipment for manufacturing the crushing roller 13 and reduces the initial cost of the equipment.

[0115] Furthermore, since the first part 49A and the second part 49B can be manufactured separately, even if defects occur during the manufacturing of each part, the entire roller 49 does not need to be discarded, thus reducing waste. Therefore, the yield rate when manufacturing the crushing roller 13 can be improved. In addition, when remanufacturing the roller 49, if the discarded parts are dissolved and reused, the cost of dissolution can be reduced.

[0116] In addition, the first ceramic part 52A and the second ceramic part 52B can also be manufactured separately, so the amount of waste can be reduced in the same way when manufacturing ceramic block CB.

[0117] [Variation Example 1]

[0118] Next, use Figure 5 The following describes a variation of this embodiment. Figure 5 In this context, UP represents "up" in the vertical direction.

[0119] In this embodiment, the method for manufacturing the second part 49B and the method for joining the first part 49A and the second part 49B differ from those in the embodiments described above. Other structures are the same as in the embodiments described above; therefore, the same reference numerals are used to label the same structures, and detailed descriptions thereof are omitted.

[0120] In this modified example, the first part 49A and the second part 49B are integrally joined by casting. Specifically, the finished first part 49A is disposed in the lower part of the mold 160. At this time, the first part 49A is preheated sufficiently. When molten metal is poured into the mold 160 after the first part 49A is disposed there, the first part 49A acts as a cold mold during casting, thereby causing the molten metal to cool and shrink, which may result in shrinkage cavities inside the second part 49B. By preheating the first part 49A, the cooling rate of the molten metal is reduced, thus suppressing the formation of shrinkage cavities.

[0121] Furthermore, the manufacturing method of the first part 49A is the same as that of the above-described embodiment.

[0122] Next, the ceramic block CB for the second part 49B is placed in a predetermined position within the mold 160. At this time, the ceramic block CB is fixed in the predetermined position by clamping it between the top surface of the mold 160 and the first part 49A (first ceramic part 52A).

[0123] Next, molten metal is allowed to flow from gate 61 through runner 62 into mold 160. At this time, the molten metal flows into the space above the first part 49A. Thus, molten metal fills mold 160 (see arrow m).

[0124] Next, the molten metal is cooled and solidified. This creates the second part 49B. At this point, the second part 49B is manufactured as an integral part of the first part 49A.

[0125] In this modified example, the roller section 49 is manufactured in this way.

[0126] According to this modified example, since the second part 49B is shaped to correspond to the mating surface of the first part 49A, it is unnecessary to perform machining on the mating surfaces of the first part 49A and the second part 49B. Therefore, machining processes can be omitted.

[0127] In addition, such as Figure 5 As shown by the dashed lines, the first portion 49A may also have a protrusion 70 with a generally T-shaped cross-section. The protrusion 70 protrudes from the side of the second portion 49B of the first base 51A. The protrusion 70 is formed integrally with the first base 51A during the casting of the first portion 49A.

[0128] With this configuration, when manufacturing the second part 49B, the protrusion 70 is embedded in the second part 49B, thus enabling the first part 49A and the second part 49B to be joined more firmly.

[0129] Thus, in this modified example, the first part 49A and the second part 49B are joined by casting. Therefore, the fixing bolts 53 and nuts 55 described in the above embodiment are not provided on the roller part 49. In addition, bolt holes 54 are not formed in the first base 51A and the second base 51B.

[0130] [Variation Example 2]

[0131] Next, use Figure 6 The following describes a variation of this embodiment.

[0132] In this modified example, the method of joining the first part 49A and the second part 49B differs from that in the above embodiment. Other structures are the same as in the above embodiment, therefore, the same reference numerals are used to label the same structures and their detailed descriptions are omitted.

[0133] In this modified example, a fixing part 80 is used to join the first part 49A and the second part 49B. The fixing part 80 integrally includes: a cylindrical part 81 disposed between the journal housing 48 and the first base 51A and the second base 51B; a first abutting part 82 extending radially and outward from one end of the cylindrical part 81 in the axial direction and abutting against one end face of the first base 51A in the axial direction; and a second abutting part 83 extending radially and outward from the other end of the cylindrical part 81 in the axial direction and abutting against the other end face of the second base 51B in the axial direction.

[0134] The fixing part 80 is formed of a material (e.g., carbon steel) that has a lower hardness than the first base 51A and the second base 51B and is easy to machine.

[0135] The cylindrical portion 81 has a bolt hole 81a through which a fixing bolt 53 is inserted.

[0136] In this modified example, the first base 51A is fitted from the outside to the outer periphery of the journal housing 48 via the cylindrical portion 81. In addition, the second base 51B is fitted from the outside to the outer periphery of the journal housing 48 via the cylindrical portion 81.

[0137] In this modified example, the first abutting portion 82 and the second abutting portion 83 are fixed by a fixing bolt 53 that passes through the cylindrical portion 81. The head 53a of the fixing bolt 53 abuts against the first abutting portion 82. In addition, the nut 55, which is screwed into the front end of the fixing bolt 53, abuts against the second abutting portion 83. Therefore, by tightening the fixing bolt 53 and the nut 55, the first abutting portion 82 and the second abutting portion 83 clamp the first base portion 51A and the second base portion 51B from both sides in the axial direction. Therefore, the first portion 49A and the second portion 49B can be joined.

[0138] Furthermore, the hardness of the fixing part 80 is lower than that of the first base 51A, etc., so it can be easily machined. As a result, compared to the case where bolt holes 81a are formed in the first base 51A, etc., the fixing bolt 53 can be easily inserted. Therefore, the crushing roller 13 can be easily manufactured.

[0139] Thus, in this modified example, the first portion 49A and the second portion 49B are joined using the fixing part 80. Therefore, the fixing bolt 53 and nut 55 described in the above embodiment are not provided on the roller portion 49. In addition, bolt holes 54 are not formed in the first base 51A and the second base 51B.

[0140] [Variation Example 3]

[0141] Next, use Figure 7 The following describes a variation of this embodiment.

[0142] In this modified example, the difference from the above embodiment lies in the fact that the first portion 49A and the second portion 49B have recesses. Other structures are the same as in the above embodiment, therefore, the same reference numerals are used to refer to the same structures and their detailed descriptions are omitted.

[0143] In this modified example, the first base 51A has a first recess 51Ab that is recessed from the first contact surface 51Aa that abuts against the second base 51B. Additionally, the second base 51B has a second recess 51Bb that is recessed from the second contact surface 51Ba that abuts against the first base 51A.

[0144] In addition, the first recess 51Ab and the second recess 51Bb form a closed space S.

[0145] In this modified example, the first base 51A and the second base 51B have recesses. Therefore, compared to a structure without recesses, the volume of the first base 51A and the second base 51B can be reduced. Thus, for example, when manufacturing the first part 49A and the second part 49B by casting, the amount of molten metal required for a single casting can be reduced. Therefore, the molten metal furnace for manufacturing the molten metal can be miniaturized. Therefore, the equipment for manufacturing the crushing roller 13 can be space-saving, and the initial cost of the equipment can be reduced.

[0146] Alternatively, a detection unit 90 for detecting wear of the first ceramic part 52A and the second ceramic part 52B can be provided in the closed space S formed by the first recess 51Ab and the second recess 51Bb. This allows for the detection of wear on the first ceramic part 52A and the second ceramic part 52B. Furthermore, by providing the detection unit 90 within the recesses formed in the first base 51A and the second base 51B, the distance between the detection unit 90 and the objects being detected (the first ceramic part 52A and the second ceramic part 52B in this modified example) can be relatively short. Therefore, the structure of the wear detection unit can be simplified.

[0147] Furthermore, since the detection unit 90 is installed within the enclosed space S, the pulverized solid fuel and the like are less likely to come into contact with the detection unit 90. Therefore, the detection unit 90 is less likely to be damaged.

[0148] In addition, wear detection methods for the inspection unit 90 include electrical methods using probes or methods using sound waves.

[0149] [Variation Example 4]

[0150] Next, use Figure 8A variation of this embodiment will now be described. In this variation, the difference from the above embodiment lies in the fact that the lifting member 91 is inserted into the mating surface of the first part 49A and the second part 49B. Other structures are the same as in the above embodiment; therefore, the same reference numerals are used to label identical structures, and detailed descriptions are omitted.

[0151] In this modified example, as described above, the lifting member 91 is clamped on the mating surface of the first part 49A and the second part 49B. The eye bolt 92 engages with the lifting member 91.

[0152] The crushing roller 13 is provided with suspension bolt holes for use during the installation or maintenance of the mill 10. Sometimes, an easily machined carbon fiber hanger is cast into the roller section 49 to make it an integral part. During this casting, it is possible that part of the hanger melts, causing the molten metal of the hanger to mix into the metal structure of the base of the roller section 49.

[0153] On the other hand, in this modified example, since the lifting member 91 is clamped between the mating surfaces of the first part 49A and the second part 49B, it is possible to suppress the mixing of dissimilar metals during casting.

[0154] [Variation Example 5]

[0155] Next, use Figure 9 A variation of this embodiment will now be described. In this variation, the engagement between the roller portion 49 and the journal housing 48 differs from the embodiment described above. Other structures are the same as in the embodiment described above; therefore, the same reference numerals are used to denote the same structures, and detailed descriptions are omitted.

[0156] In this modified example, the first base 51A and the second base 51B have engaging recesses 95 recessed from the surfaces abutting against the journal housing 48. The journal housing 48 has engaging protrusions 96 on the surfaces abutting against the first base 51A and the second base 51B, which engage with the engaging recesses 95 by being received within them.

[0157] In this modified example, the journal housing 48 has an engaging protrusion 96 that engages with the engaging recess 95. Thus, the engaging recess 95 and the engaging protrusion 96 engage, thereby restricting the relative movement of the journal housing 48 with the first base 51A and the second base 51B. This allows the journal housing 48 to be securely fixed to the first base 51A and the second base 51B.

[0158] Furthermore, the engaging protrusion 96 is housed within the engaging recess 95. Therefore, compared to the case where the engaging portion between the roller portion 49 and the journal housing 48 is located at the axial end of the crushing roller 13, the crushed solid fuel and the like are less likely to come into contact with the engaging protrusion 96. Thus, the engaging protrusion 96 is less prone to wear. Additionally, the engaging protrusion 96 can be detached from the journal housing 48, allowing the crushing roller 13 to be installed from only one side of the journal housing 48. Specifically, the sequence can be: first, the first portion 49A is installed on the journal housing 48, then the engaging protrusion 96 is installed, and finally the second portion 49B is installed, and then they are engaged.

[0159] Furthermore, compared to the case where the engagement portion between the roller portion 49 and the journal housing 48 is provided at the axial end of the crushing roller 13, the width of the crushing surface can be maintained and the axial length of the crushing roller 13 can be shortened. Therefore, even on a crushing table 12 of the same diameter, the crushing surface of the crushing roller 13 can be further positioned on the outer side of the crushing table 12. Thus, the increase in the outer diameter of the housing 11 that houses these crushing sections can be suppressed, and a crushing section with a size closer to that of a large mill can be realized, enabling a compact and high-capacity mill.

[0160] Furthermore, this disclosure is not limited to the above-described embodiments, and appropriate modifications can be made without departing from its spirit.

[0161] For example, the solid fuels used are not limited to those disclosed herein, and can include coal, biomass fuels, petroleum coke (PC), etc. Furthermore, these solid fuels can be used in combination.

[0162] Furthermore, for example, if only one of the first part 49A or the second part 49B is worn or damaged, only one of the first part 49A or the second part 49B can be replaced. This allows the material cost in the maintenance cost of the crushing roller 13 to be halved.

[0163] Alternatively, a structure to prevent the intrusion of micronized fuel may be provided at the joint surfaces of the first part 49A and the second part 49B, such as by applying or filling a liquid gasket or a paste-like sealant.

[0164] The crushing roller, solid fuel crushing apparatus, and manufacturing method of the crushing roller described in the above embodiments are as follows.

[0165] According to one aspect of the present disclosure, a crushing roller is housed inside a housing (11). Solid fuel is sandwiched between the crushing roller and a rotating crushing table (12) to crush the solid fuel. The crushing roller is rotated by the rotational force from the crushing table (12). The crushing roller (13) includes: a support portion (48) supported to rotate relative to the housing (11) about a central axis (C2); and an annular roller portion (49) fitted from the outside of the support portion (48) to crush the solid fuel between the roller portion and the crushing table (12). The roller portion (49) includes: a first portion (49A); and a second portion (49B) arranged and fixed to the first portion (49A) along an axial direction. The axial direction is the rotational center axis of the roller portion (49). In the direction of extension of C2), the first part (49A) has: a first base (51A) that is fitted from the outside to the outer periphery of the support (48); and a first outer periphery (52A) that is disposed on the outer periphery of the first base (51A), and the wear resistance of the first outer periphery is better than that of the first base (51A). The first part (49A) is disposed on one side further than the center line (C3) in the axial direction. The second part (49B) has: a second base (51B) that is fitted from the outside to the outer periphery of the support (48); and a second outer periphery (52B) that is disposed on the outer periphery of the second base (51B), and the wear resistance of the second outer periphery is better than that of the second base (51B). The second part is disposed on the other side further than the center line (C3) in the axial direction.

[0166] In the above structure, the first part is located on one side of the centerline in the axial direction, and the second part is located on the other side of the centerline in the axial direction. This allows for the provision of wear-resistant outer peripheral portions (the first and second outer peripheral portions) on both sides of the roller. Therefore, even when the roller is used in reverse (i.e., when the roller is removed, reversed by swapping one side with the other, and then reinstalled), solid fuel can still be pulverized by the outer peripheral portions, thus suppressing roller wear. Consequently, the lifespan of the roller can be extended.

[0167] Furthermore, in the above structure, the roller portion has a first part and a second part. Therefore, the first part and the second part can be manufactured separately. Thus, by fixing the separately manufactured first part and the second part, the outer periphery can be easily provided on both sides in the axial direction.

[0168] Furthermore, since the first and second parts can be manufactured separately, the volume of the components manufactured in one operation can be reduced compared to manufacturing the first and second parts together. Therefore, for example, when manufacturing the first and second parts by casting, the volume of the components manufactured in one casting operation can be reduced, thus reducing the amount of molten metal required for that casting operation. Consequently, the molten metal furnace for manufacturing the molten metal can be miniaturized. Therefore, the equipment for manufacturing the crushing rollers can be made more space-efficient, and the initial cost of the equipment can be reduced.

[0169] Furthermore, since the first and second parts can be manufactured separately, even if defects occur during the manufacturing of each part, the entire waste roller section is not required, thus reducing waste. Therefore, the yield rate when manufacturing crushing rollers can be improved. Additionally, when the waste portion is dissolved for remanufacturing the roller section, the cost of dissolution can be reduced.

[0170] Furthermore, in one aspect of the crushing roller disclosed herein, the roller portion (49) has a fixing portion (80), which includes: a cylindrical portion (81) disposed between the support portion (48) and the first base portion (51A) and the second base portion (51B); a first abutting portion (82) extending radially and outward from one end of the cylindrical portion (81) in the axial direction (C2) and abutting against one end face of the first base portion (51A) in the axial direction (C2); and a second abutting portion (83) extending radially and outward from the other end of the cylindrical portion (81) in the axial direction (C2). Extending outwards and abutting against the end face on the other side of the axial direction (C2) of the second base (51B), the first base (51A) is fitted from the outside to the outer periphery of the support (48) via the cylindrical portion (81), the second base (51B) is fitted from the outside to the outer periphery of the support (48) via the cylindrical portion (81), the first abutting portion (82) and the second abutting portion (83) are fixed by bolts (53) inserted through the fixing portion (80), and the cylindrical portion (81) is formed of a material with a lower hardness than the first base (51A) and the second base (51B).

[0171] In the above structure, the first abutting portion and the second abutting portion are fixed by bolts that pass through the fixing portion. Thus, the first abutting portion and the second abutting portion clamp the first base portion and the second base portion from both sides in the axial direction. Therefore, the first part and the second part can be fixed.

[0172] Furthermore, the cylindrical portion has a lower hardness than the base, making it easier to machine. Therefore, compared to forming bolt holes in the base for bolt insertion, bolts can be inserted more easily. Consequently, the crushing roller can be manufactured more easily.

[0173] In addition, in one aspect of the crushing roller disclosed herein, the first part (49A) and the second part (49B) are fixed by fasteners (53), which are inserted through a straight bolt hole (54) formed by a hole formed in the first base (51A) and a hole formed in the second base (51B).

[0174] In the above structure, the first and second parts are secured solely by fasteners. This allows for the securing of both parts without the use of large components (e.g., components that clamp the first and second parts from the outside). Consequently, the structure is simplified.

[0175] In addition, in one aspect of the crushing roller disclosed herein, the first base (51A) has a first contact surface (51Aa) that abuts against the second base (51B) and a first recess (51Ab) recessed from the first contact surface (51Aa), and the second base (51B) has a second contact surface (51Ba) that abuts against the first contact surface (51Aa) of the first base (51A) and a second recess (51Bb) recessed from the second contact surface (51Ba).

[0176] In the above structure, both the first base and the second base have recesses. Therefore, compared to a structure without recesses, the volume of the first and second bases can be reduced. Thus, for example, when manufacturing the first and second parts by casting, the volume of the component manufactured in a single casting can be reduced, thereby reducing the amount of molten metal required for a single casting. This allows for miniaturization of the molten metal furnace used to manufacture the molten metal. Consequently, the equipment for manufacturing the crushing rollers can be made more space-efficient, and the initial cost of the equipment can be reduced.

[0177] In addition, in one aspect of the crushing roller disclosed herein, the first recess (51Ab) and the second recess (51Bb) form a closed space, and a detection unit (90) for detecting wear of the first outer peripheral portion (52A) and / or the second outer peripheral portion is provided in the closed space.

[0178] In the above structure, the enclosed space formed by the first and second recesses reduces the volume of the first and second bases. Consequently, the amount of molten metal required for a single casting process can be reduced when manufacturing the first and second parts. This allows for miniaturization of the molten metal furnace used for manufacturing the molten metal. Furthermore, it enables space-saving design of the equipment for manufacturing the crushing rollers and reduces the initial cost of the equipment.

[0179] Furthermore, a detection unit for detecting wear on the first and / or second outer peripheral portions is provided within the enclosed space formed by the first and second recesses. This allows for the detection of wear on the first and / or second outer peripheral portions. Additionally, by providing the detection unit within the recess formed in the base, the distance between the detection unit and the object being detected (the first and / or second outer peripheral portions) is reduced. Therefore, the structure of the wear detection unit can be simplified.

[0180] Furthermore, because the detection unit is located within an enclosed space, pulverized solid fuel and other contaminants are less likely to come into contact with it. Therefore, the detection unit is less susceptible to damage.

[0181] In addition, in one aspect of the crushing roller disclosed herein, the first base (51A) and / or the second base (51B) have an engaging recess (95) recessed from the surface abutting the support portion (48), and the support portion (48) has an engaging protrusion (96) on the surface abutting the first base (51A) and / or the second base (51B) that engages with the engaging recess (95) by being received within the engaging recess (95).

[0182] In the above structure, the support portion has an engaging protrusion that engages with the engaging recess. Thus, by engaging the engaging recess with the engaging protrusion, relative movement between the support portion and the first base and / or the second base is restricted. This allows the support portion to be securely fixed to the first base and / or the second base.

[0183] Furthermore, the engaging protrusion is housed within the engaging recess. Therefore, compared to the case where the engaging portion between the roller and the journal housing is located at the axial end of the crushing roller, the crushed solid fuel and the like are less likely to come into contact with the engaging protrusion. Thus, the engaging protrusion is less prone to damage.

[0184] In addition, one aspect of the solid fuel pulverizing apparatus disclosed herein includes: a pulverizing roller (13) as described in any of the above; a pulverizing table (12) that rotates to clamp solid fuel between the pulverizing table and the pulverizing roller (13) to pulverize solid fuel; and a housing (11) that houses the pulverizing roller (13) and the pulverizing table (12).

[0185] In addition, in one aspect of the manufacturing method of the crushing roller disclosed herein, the crushing roller (13) is housed inside the housing (11), and solid fuel is sandwiched between the crushing roller and the rotating crushing table (12) to crush the solid fuel. The crushing roller is rotated by the rotational force from the crushing table (12). The crushing roller (13) includes: a support portion (48) supported so as to be able to rotate about the central axis (C2) relative to the housing (11); and an annular roller portion (49) from the outside. The roller (49) is fitted to the outer periphery of the support (48) and crushes solid fuel between the roller and the crushing worktable (12). The roller (49) has a first part (49A) and a second part (49B) arranged and fixed to the first part (49A) along the axial direction. The axial direction is the direction in which the rotation center axis (C2) of the roller (49) extends. The first part (49A) has a first base (51A). The outer peripheral portion of the support portion (48) is fitted from the outside; and the first outer peripheral portion (52A) is disposed on the outer peripheral surface of the first base portion (51A), and the wear resistance of the first outer peripheral portion is better than that of the first base portion (51A). The first part (49A) is disposed on one side relative to the center line (C3) in the axial direction. The second part (49B) has: a second base portion (51B) fitted from the outside of the outer peripheral portion of the support portion (48); and the second outer peripheral portion. (52B) is disposed on the outer peripheral surface of the second base (51B), and the wear resistance of the second outer peripheral portion is better than that of the second base (51B). The second portion is disposed on the other side of the center line (C3) in the axial direction. The manufacturing method of the crushing roller includes the following steps: manufacturing the first portion (49A); manufacturing the second portion (49B); and fixing the first portion (49A) and the second portion (49B).

[0186] Furthermore, in one aspect of the manufacturing method of the crushing roller disclosed herein, in the process of manufacturing the second part (49B) and the process of fixing the first part (49A) and the second part (49B), molten metal is allowed to flow into the mold (160) while the first part, which was manufactured in the process of manufacturing the first part, is placed in a mold (160) of a shape corresponding to the crushing roller, and then the molten metal is cooled, thereby manufacturing the second part (49B) and fixing the first part (49A) and the second part (49B) integrally.

[0187] In the above structure, since the second part has a shape corresponding to the mating surface of the first part, it is not necessary to perform machining on the mating surfaces of the first part and the second part. Therefore, machining processes can be omitted.

[0188] In addition, in one aspect of the manufacturing method of the crushing roller disclosed herein, the first part (49A) has a protrusion (70) protruding from the side of the second part (49B).

[0189] In the above structure, when manufacturing the second part, a protrusion is embedded in the second part, thus enabling the first part and the second part to be joined more firmly.

[0190] Explanation of reference numerals in the attached figures

[0191] 1: Power generation equipment

[0192] 10: Grinding mill

[0193] 11: Shell

[0194] 12: Crushing Table

[0195] 13: Crushing Roller

[0196] 14: Reducer

[0197] 15: Mill motor

[0198] 16: Rotary grading machine

[0199] 16a: Blade

[0200] 17: Coal supply pipe

[0201] 18: Grader motor

[0202] 19: Export Port

[0203] 21: Hopper

[0204] 22: Material drop section

[0205] 25: Coal feeder

[0206] 26: Conveying Department

[0207] 27: Coal feeder motor

[0208] 30: Air Supply Department

[0209] 30a: Hot airflow path

[0210] 30b: Cold airflow path

[0211] 30c: Hot air damper

[0212] 30d: Air conditioning damper

[0213] 31: Primary air ventilation fan

[0214] 34: Air preheater

[0215] 40: Condition Detection Department

[0216] 41: Bottom surface

[0217] 42: Top

[0218] 43: Journal head

[0219] 44: Support arm

[0220] 45: Support shaft

[0221] 46: Pressing device

[0222] 47: Journal Shaft

[0223] 48: Journal housing (support part)

[0224] 49: Roller section

[0225] 49A: Part One

[0226] 49B: Part Two

[0227] 49a: outer peripheral surface

[0228] 50: Control Department

[0229] 51A: First base

[0230] 51Aa: First contact surface

[0231] 51Ab: first concave part

[0232] 51B: Second base

[0233] 51Ba: Second contact surface

[0234] 51Bb: Second concave part

[0235] 52A: First ceramic section (outer perimeter)

[0236] 52B: Second Ceramic Department

[0237] 53: Fixing bolts

[0238] 53a: Head

[0239] 54: Bolt hole

[0240] 55: Nut

[0241] 60: Casting mold

[0242] 61: Gate

[0243] 62: Sprue

[0244] 70: Protrusion

[0245] 80: Fixed part

[0246] 81: Cylindrical section

[0247] 81a: Bolt hole

[0248] 82: First contact section

[0249] 83: Second contact section

[0250] 90: Testing Department

[0251] 91: Lifting components

[0252] 92: Eye bolt

[0253] 95: Engagement recess

[0254] 96: Engaging protrusion

[0255] 100: Solid fuel pulverizing device

[0256] 110: Primary airflow path

[0257] 120: Micro fuel supply pipe

[0258] 160: Casting mold

[0259] 200: Boiler

[0260] 210: Furnace

[0261] 220: Burner.

Claims

1. A pulverizing roller, housed inside a housing, for pulverizing solid fuel by clamping it between the pulverizing roller and a rotating pulverizing table, the pulverizing roller rotating in response to a rotational force from the pulverizing table. The crushing roller comprises: The support portion is supported so that it can rotate about a rotational central axis relative to the housing; and A circular roller portion is fitted into the outer periphery of the support portion from the outside, and pulverizes solid fuel between the roller portion and the pulverizing table. The roller portion includes: a first portion; and a second portion, which is arranged and fixed to the first portion along an axial direction, wherein the axial direction is the direction in which the rotation center axis of the roller portion extends, and the outer peripheral surface of the roller portion is curved in an arc shape in a cross-section along the axial direction. The first portion has: a first base portion that fits into the outer periphery of the support portion from the outside; and a first outer periphery portion integrally disposed with the first base portion on the outer periphery surface of the first base portion, wherein the wear resistance of the first outer periphery portion is superior to that of the first base portion, and the first portion is disposed on one side relative to the centerline in the axial direction. The second part has: a second base portion that fits into the outer periphery of the support portion from the outside; and a second outer periphery portion integrally disposed on the outer periphery surface of the second base portion, wherein the wear resistance of the second outer periphery portion is superior to that of the second base portion, and the second part is disposed on the other side from the centerline in the axial direction. The first outer peripheral portion and the second outer peripheral portion are arranged to be linearly symmetrical about the center in the cross section along the axial direction. The roller portion has a fixing portion, which includes: a cylindrical portion disposed between the support portion and the first base portion and the second base portion; a first abutting portion extending radially and outward from one end of the cylindrical portion in the axial direction and abutting against one end face of the first base portion in the axial direction; and a second abutting portion extending radially and outward from the other end of the cylindrical portion in the axial direction and abutting against the other end face of the second base portion in the axial direction. The first base portion is fitted from the outside to the outer periphery of the support portion via the cylindrical portion. The second base portion is fitted from the outside into the outer periphery of the support portion via the cylindrical portion. The first abutting part and the second abutting part are fixed by bolts inserted through the fixing part. The cylindrical portion is formed of a material with a lower hardness than the first base portion and the second base portion.

2. The crushing roller according to claim 1, wherein, The first part and the second part are fixed together by fasteners that pass through a straight bolt hole formed by a hole formed in the first base and a hole formed in the second base.

3. The crushing roller according to claim 1 or 2, wherein, The first base has a first abutting surface that abuts against the second base and a first recess that is recessed from the first abutting surface. The second base has a second abutting surface that abuts against the first abutting surface of the first base and a second recess that is recessed from the second abutting surface.

4. The crushing roller according to claim 3, wherein, The first recess and the second recess form a closed space. A detection unit for detecting wear on the first outer peripheral portion and / or the second outer peripheral portion is provided in the enclosed space.

5. The crushing roller according to claim 1 or 2, wherein, The first base portion and / or the second base portion have an engaging recess recessed from the surface abutting against the support portion. The support portion has an engaging protrusion on the surface that abuts against the first base portion and / or the second base portion, which engages with the engaging recess portion by being received within the engaging recess portion.

6. A solid fuel pulverizing device, comprising: The crushing roller according to any one of claims 1 to 5; A pulverizing table rotates, and solid fuel is clamped between the pulverizing table and the pulverizing roller to pulverize the solid fuel; and The housing contains the crushing roller and the crushing table.

7. A method for manufacturing a crushing roller, wherein the crushing roller is housed inside a housing, solid fuel is sandwiched between the crushing roller and a rotating crushing table to crush the solid fuel, and the crushing roller is rotated by a rotational force from the crushing table. The crushing roller comprises: The support portion is supported so that it can rotate about a rotational central axis relative to the housing; and A circular roller portion is fitted into the outer periphery of the support portion from the outside, and pulverizes solid fuel between the roller portion and the pulverizing table. The roller portion includes: a first portion; and a second portion, which is arranged and fixed to the first portion along an axial direction, wherein the axial direction is the direction in which the rotation center axis of the roller portion extends, and the outer peripheral surface of the roller portion is curved in an arc shape in a cross-section along the axial direction. The first portion has: a first base portion that fits into the outer periphery of the support portion from the outside; and a first outer periphery portion integrally disposed with the first base portion on the outer periphery surface of the first base portion, wherein the wear resistance of the first outer periphery portion is superior to that of the first base portion, and the first portion is disposed on one side relative to the centerline in the axial direction. The second part has: a second base portion that fits into the outer periphery of the support portion from the outside; and a second outer periphery portion integrally disposed on the outer periphery surface of the second base portion, wherein the wear resistance of the second outer periphery portion is superior to that of the second base portion, and the second part is disposed on the other side from the centerline in the axial direction. The first outer peripheral portion and the second outer peripheral portion are arranged to be linearly symmetrical about the center in the cross section along the axial direction. The roller portion has a fixing portion, which includes: a cylindrical portion disposed between the support portion and the first base portion and the second base portion; a first abutting portion extending radially and outward from one end of the cylindrical portion in the axial direction and abutting against one end face of the first base portion in the axial direction; and a second abutting portion extending radially and outward from the other end of the cylindrical portion in the axial direction and abutting against the other end face of the second base portion in the axial direction. The first base portion is fitted from the outside to the outer periphery of the support portion via the cylindrical portion. The second base portion is fitted from the outside into the outer periphery of the support portion via the cylindrical portion. The first abutting part and the second abutting part are fixed by bolts inserted through the fixing part. The cylindrical portion is formed of a material with a lower hardness than the first base and the second base. The manufacturing method of the crushing roller includes the following steps: The process of manufacturing the first part; The process of manufacturing the second part; and The process of fixing the first part and the second part.

8. The method for manufacturing a crushing roller according to claim 7, wherein, In the process of manufacturing the second part and fixing the first part and the second part, molten metal is flowed into the mold while the first part, manufactured in the process of manufacturing the first part, is placed in a mold of a shape corresponding to the crushing roller, and then the molten metal is cooled, thereby manufacturing the second part and fixing the first part and the second part together.

9. The method for manufacturing a crushing roller according to claim 8, wherein, The first portion has a protrusion that protrudes from the side of the second portion.

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