JP7612396B2 - Crusher and power generation plant, and method for operating the crusher - Google Patents

Description

This disclosure relates to a pulverizer, a power generation plant, and a method for operating the pulverizer.

Conventionally, solid fuels (carbon-containing solid fuels) such as coal and biomass fuel are pulverized into fine powder within a specified particle size range by a pulverizer (mill) and then supplied to a combustion device. In the mill, solid fuels such as coal and biomass fuels fed onto a pulverizing table are pinched between the pulverizing table and a pulverizing roller to pulverize them, and from the pulverized solid fuel that has been pulverized into fine powder by a conveying gas (primary air) supplied from the periphery of the pulverizing table, fine fuels within a specified particle size range are selected by a classifier, transported to a boiler, and burned in a combustion device. In a thermal power plant, steam is generated by heat exchange with the combustion gas generated by burning the pulverized fuel in the boiler, and the steam is used to rotate and drive a steam turbine, which then rotates and drives a generator connected to the steam turbine to generate electricity (for example, Patent Document 1).

Patent document 1 discloses a mill in which a grinding roller is fixed to a housing via a journal shaft, which serves as a support shaft, and a journal head. The journal head is supported by a swing shaft so that it can swing freely relative to the housing. This allows the grinding roller to swing up and down around the swing shaft of the journal head as a fulcrum, and the distance between the grinding roller and the grinding surface of the grinding table can be changed.

JP 2017-113701 A

The journal head receives a load from the hydraulic cylinder and presses the grinding roller against the grinding table. In other words, the journal head transmits a grinding load to press the grinding roller against the grinding table and promote grinding. When solid fuel fed into the mill is pinched between the grinding roller and the grinding table, the journal head receives a reaction force from the grinding table against the grinding load and a rotational force caused by the rotation of the grinding table. These forces acting on the journal head increase according to the grinding capacity and load of the mill. Furthermore, if foreign matter is mixed in the solid fuel, the journal head will bite into the foreign matter and receive an impact load. For this reason, there has been a demand for improving the strength of the journal head, or reducing the weight while maintaining the journal head's strength.

This disclosure was made in consideration of these circumstances, and aims to provide a crusher, a power generation plant, and a method for operating a crusher that can improve the strength of the support part.

In order to solve the above problems, the pulverizer, power generation plant, and pulverizer operating method of the present disclosure employ the following measures.
A crusher according to one embodiment of the present disclosure includes a housing forming an outer shell, a crushing table housed inside the housing and having an upper surface to which solid fuel is supplied, a crushing roller housed inside the housing and crushing the solid fuel supplied to the upper surface of the crushing table, a support portion that supports the crushing roller so that it can swing around a central axis extending along a horizontal direction relative to the housing, and a pressing portion that presses the support portion so as to swing the crushing roller and press it against the crushing table, the support portion having a pressure-receiving portion pressed by the pressing portion and a connecting portion provided between the pressure-receiving portion and the crushing roller, and the connecting portion is curved so that a front edge portion located at the front of the pressing portion in the pressing direction protrudes forward in the pressing direction.

A method of operating a crusher according to one aspect of the present disclosure includes a housing forming a shell, a crushing table housed inside the housing and having a top surface to which solid fuel is supplied, a crushing roller housed inside the housing and crushing the solid fuel supplied to the top surface of the crushing table, a support part supporting the crushing roller so as to be swingable about a central axis extending along a horizontal direction relative to the housing, and a pressing part pressing the support part so as to swing the crushing roller and press it against the crushing table, the support part having a pressure-receiving part pressed by the pressing part and a connecting part connecting the pressure-receiving part and the crushing roller, the connecting part being curved so that a front edge part located in front of the pressing direction of the pressing part protrudes forward in the pressing direction, and the method includes a step of crushing the solid fuel with the crushing roller.

This disclosure makes it possible to improve the strength of the support part.

FIG. 2 is a configuration diagram showing a solid fuel pulverizer and a boiler according to an embodiment of the present disclosure. FIG. 2 is a perspective view of a journal head provided on a mill according to an embodiment of the present disclosure. FIG. 3 is an enlarged view of a main portion of FIG. 2 . 4 is a cross-sectional view taken along the line IV-IV in FIG. 2. FIG. 2 is a perspective view of a journal head provided in a mill according to an embodiment of the present disclosure, illustrating the load acting on the journal head. FIG. 13 is a perspective view showing a journal head according to a modified embodiment of the present disclosure. FIG. 13 is a perspective view showing a journal head according to a modified embodiment of the present disclosure.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A pulverizer, a power plant, and a method of operating a pulverizer according to an embodiment of the present disclosure will now be described with reference to the drawings. A 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 upper direction, and "upper" in terms such as upper part and upper surface refers to the vertically upper part. Similarly, "lower" refers to the vertically lower part, and the vertical direction is not precise and may include errors.

The solid fuel pulverization device 100 of this embodiment is a device 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.

The solid fuel pulverizer 100 of this embodiment includes a mill (pulverizer) 10, a coal feeder (fuel supplier) 20, a blower (carrier gas supplier) 30, a state detector 40, and a controller (determiner) 50.

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

The mill 10 comprises a housing 11, a grinding table (rotary table) 12, a grinding roller 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 grinding table 12, the grinding 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 portion 42 of the housing 11. This fuel supply unit 17 supplies solid fuel guided from the bunker 21 into the housing 11, and is disposed in the vertical direction at the center position of the housing 11 with its lower end extending into the interior of the housing 11.

A drive unit 14 is provided near the bottom surface 41 of the housing 11, and the grinding table 12 is rotatably disposed and rotated by the driving force transmitted from a mill motor 15 connected to the drive unit 14.
The grinding table 12 is a circular member in a plan view, and is disposed so as to face the lower end of the fuel supply unit 17. The upper surface of the grinding table 12 may have an inclined shape, for example, low at the center and high toward the outside, and the outer periphery may have a shape that is curved upward. The fuel supply unit 17 supplies solid fuel (for example, coal or biomass fuel in this embodiment) from above toward the grinding table 12 below, and the grinding table 12 grinds the supplied solid fuel between the grinding roller 13.

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 to the outer periphery of the grinding table 12, where it is pinched and ground between the grinding table 12 and the grinding rollers 13. The ground solid fuel is 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 the primary air flowing in from the primary air passage 100a flows out into the space above the grinding table 12 in the housing 11. A swirling blade (not shown) is provided at the outlet, which applies a swirling force to the primary air blown out from the outlet. The primary air given a swirling force by the swirling blade becomes an airflow having a swirling velocity component, and conveys the solid fuel pulverized on the grinding table 12 to the rotary classifier 16 located at the upper part in the housing 11. Among the pulverized solid fuel, particles larger than a predetermined particle size are classified by the rotary classifier 16, or fall without reaching the rotary classifier 16, are returned to the grinding table 12, and are pulverized again between the grinding table 12 and the grinding roller 13.

The crushing roller 13 is a rotating body that crushes the solid fuel supplied onto the crushing table 12 from the 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 where the three crushing rollers 13 come into contact with the upper surface of the crushing table 12 (pressing portions) are equidistant from the central axis of rotation of the crushing table 12.

The crushing roller 13 can swing up and down by the journal head (support part) 45, and is supported so that it can 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 part 17, the solid fuel is pressed between the crushing roller 13 and the crushing table 12 and crushed.

The support arm 47 of the journal head 45 is supported on the side of the housing 11 by a swing shaft portion 55 whose middle portion is aligned horizontally so that the crushing roller 13 can swing up and down around the swing shaft portion 55. A pressing device (pressing portion) 49 is provided on the upper end portion on the vertically upper side of the support arm 47. The pressing device 49 is fixed to the housing 11, and by pressing the journal head 45, a load is applied to the crushing roller 13 via the support arm 47, etc., so as to press the crushing roller 13 against the crushing table 12. The pressing device 49 presses the journal head 45 from the inner peripheral surface side of the housing 11 toward the center side of the housing 11.
The journal head 45 will be described in detail later.

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

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 at 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 the solid fuel pulverized by the pulverizing table 12 and the pulverizing rollers 13 (hereinafter, the pulverized solid fuel is referred to as "pulverized fuel") into fuel having a particle size larger than a predetermined particle size (for example, 70 to 100 μm for coal) (hereinafter, the pulverized fuel having a particle size larger than the predetermined particle size is referred to as "coarse pulverized fuel") and fuel having a particle size smaller than the predetermined particle size (hereinafter, the pulverized fuel having a particle size smaller than the predetermined particle size is referred to as "fine pulverized fuel"). The rotary classifier 16 that 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 swirling vanes on the outer periphery of the casing instead of the blades 16a.

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

The fuel supply unit 17 is attached so that its lower end extends vertically into the interior of the housing 11, penetrating the ceiling portion 42 of the housing 11, and supplies solid fuel fed from the top of the fuel supply unit 17 to the approximate center region of the grinding table 12. The fuel supply unit 17 receives solid fuel from the coal feeder 20.

The coal feeder 20 includes a transport unit 22 and a coal feeder motor 23. The transport unit 22 is, for example, a belt conveyor, and transports the solid fuel discharged from the lower end of a downspout 24 located directly below the bunker 21 to the top of the fuel supply unit 17 of the mill 10 by the driving force provided by the coal feeder motor 23, and inputs the solid fuel 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. The downspout 24, which is a pipe extending in the vertical direction directly below the bunker 21, holds fuel in a layered state inside, and the solid fuel layers layered inside the downspout 24 ensure a sealing performance that prevents the primary air and pulverized fuel on the mill 10 side from flowing back to the bunker 21 side.
The amount of solid fuel supplied to the mill 10 is adjusted, for example, by the moving speed of the belt conveyor of the transport unit 22.

The blower section 30 is a device that blows primary air into the housing 11 to dry the pulverized fuel and to transport the fuel to the rotary classifier 16 .
In order to appropriately adjust the flow rate and temperature of the primary air blown into the inside of the housing 11, 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 this embodiment, the hot gas flow path 30a supplies a portion of the air (outside air) sent out from the primary air ventilator 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.

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

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 from the primary air passage 100a to the inside of the housing 11 may be adjusted by introducing a portion of the combustion gas discharged from the boiler 200 via a gas recirculation fan (not shown) into the hot gas supplied from the hot gas passage 30a and mixing it.

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 between the pressure at the portion where the primary air flows into the inside of the housing 11 from the primary air flow passage 100a and the pressure at the outlet port 19 where the primary air and the pulverized fuel are discharged from the inside of the housing 11 to the pulverized fuel supply flow passage 100b as the differential pressure of the mill 10. 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 in accordance with the pressure difference of the mill 10, the amount of pulverized fuel discharged from the outlet port 19 can be adjusted in relation to the amount of solid fuel supplied to the mill 10.Therefore, within the range in which 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 in this embodiment is, for example, a temperature measuring means, which 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 temperature does not exceed the upper limit temperature. 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.

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

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

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

The burner 220 is a device that burns pulverized fuel to form a flame using 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: Forced Draft Fan) 32 in a heat exchanger 34. The pulverized fuel is burned in the furnace 210, and the high-temperature combustion gas is exhausted to the outside of the boiler 200 after passing through heat exchangers (not shown) such as an evaporator, a superheater, and a coal economizer.

The combustion gas discharged from the boiler 200 undergoes a predetermined treatment in an environmental device (such as a denitration device or an electric dust collector, not shown), and then undergoes heat exchange between the air discharged from the primary air fan 31 and the air discharged from the forced draft fan 32 in a heat exchanger 34, such as an air preheater, 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 boiler 200 is heated in a coal economizer (not shown), and then further heated by an evaporator (not shown) and a superheater (not shown) to generate high-temperature, high-pressure steam. This is then sent to the steam turbine (not shown), which is the power generation section, to rotate the steam turbine, which in turn rotates a generator (not shown) connected to the steam turbine to generate electricity, thereby constituting power generation plant 1.

Next, the journal head 45 according to this embodiment will be described in detail with reference to FIGS.
2, the journal head 45 has a journal shaft portion (shaft portion) 51 that rotatably supports the crushing roller 13, a mounting portion 52 on which the journal shaft portion 51 is mounted, a pressure-receiving portion 53 that is pressed by a pressing device 49, a support arm (connection portion) 47 provided between the pressure-receiving portion 53 and the crushing roller 13, a swing shaft portion 55 that swingably supports the housing 11, and a stopper portion 56 provided below the mounting portion 52. The support arm 47 also has an arm portion 60 located at the front edge portion and a rib portion 61 located at the rear portion.

The journal shaft portion 51 is a cylindrical member. As shown in FIG. 1, the journal shaft portion 51 extends from the inner peripheral surface side of the housing 11 toward the center side. The journal shaft portion 51 rotatably supports the crushing roller 13 at its tip end (the end portion on the central side of the housing 11). In addition, as shown in FIG. 2, the journal shaft portion 51 has its base end (the end portion on the inner peripheral surface side of the housing 11) fixed to the installation portion 52.

The installation portion 52 has an installation surface (surface) 52a facing the grinding roller 13. The installation surface 52a is formed in a flat shape. An insertion hole through which the journal shaft portion 51 is inserted is formed in the installation surface 52a at approximately the center. The journal shaft portion 51 is inserted into the insertion hole formed in the installation surface 52a. The installation portion 52 and the journal shaft portion 51 may be fixed by fitting together, or may be fastened and fixed by a fastener such as a bolt. In addition, the installation portion 52 may be provided with a rotation stopper (not shown) to prevent the journal shaft portion 51 from rotating due to the rotation of the grinding roller 13. The rotation stopper may be configured, for example, so that the tip of a bolt or the like fixed to the installation portion 52 comes into contact with the journal shaft portion 51 and the outer circumferential surface to prevent the journal shaft portion 51 from rotating. In addition, the journal shaft portion 51 may be prevented from rotating by providing a groove into which the tip of a bolt can be inserted in the journal shaft portion 51.
The installation portion 52 and the journal shaft portion 51 may be formed as a single unit.

The pressure receiving portion 53 is provided on the upper portion of the journal head 45 and on the inner peripheral surface side of the housing 11. The pressure receiving portion 53 has a pressure receiving surface 53a that receives a pressing force from the pressing device 49. The pressure receiving surface 53a is disposed so as to face the pressing portion of the pressing device 49. The pressure receiving surface 53a is formed in a flat shape. The pressure receiving surface 53a is formed on one end of the pressure receiving portion 53. The other end of the pressure receiving portion 53 is connected to the arm portion 60.

The cross-sectional area (hereinafter simply referred to as "cross-sectional area") of the pressure receiving part 53 when cut at a plane intersecting with the direction in which the pressure device 49 presses the support part to swing (see A1 in FIG. 1, hereinafter referred to as the "swing direction") is larger than the cross-sectional area of the arm part 60. The cross-sectional area of the pressure receiving part 53 gradually decreases from the pressure receiving surface 53a pressed by the pressure device 49 toward the connection part with the arm part 60. In detail, the thickness gradually decreases from the pressing surface toward the connection part with the arm part 60. The length L of the pressure receiving part 53 in the pressing direction is set to the point where the generated stress becomes the same according to Saint-Venant's principle. Specifically, for example, the length L of the pressure receiving part 53 in the pressing direction may be about three times the thickness h of the pressure receiving part 53 at the pressure receiving surface 53a, as shown in FIG. 3.

The support arm 47 has an arm portion (front edge portion) 60 located at the front edge and a rib portion 61 located at the rear.

The arm portion 60 is a plate-like member having a predetermined thickness. The arm portion 60 is located at the front edge in the pressing direction (arrow A2 in FIG. 2) of the pressing device 49. The arm portion 60 is curved so as to protrude forward in the pressing direction. In other words, a front surface 60a and a rear surface 60b of the arm portion 60 are curved surfaces.
In detail, the arm portion 60 is curved so that the front edge (portion corresponding to the front surface 60a) and the rear edge (portion corresponding to the rear surface 60b) of the vertical cross section form a parabola.

The arm portion 60 connects the pressure receiving portion 53 and the installation portion 52. More specifically, one end of the arm portion 60 in the extension direction is connected to the pressure receiving portion 53. The other end of the arm portion 60 in the extension direction is connected to the installation portion 52. A plate-shaped rib portion 61 is connected to a rear surface 60b of the arm portion 60 in the pressing direction so as to be perpendicular to the rear surface 60b.
The plate thickness of the arm portion 60 may be formed to be thicker than the plate thickness of the rib portion 61 .

The front surface 60a (surface) of the arm section 60, which faces the crushing roller 13, is connected to the installation surface 52a of the installation section 52. In detail, the front surface of the arm section 60 and the installation surface 52a of the installation section 52 are smoothly connected. Specifically, the front surface 60a of the arm section 60 and the installation surface 52a of the installation section 52 are connected to form a continuous curved surface. In other words, the front surface 60a of the arm section 60 and the installation surface 52a of the installation section 52 are connected without bending.

The rib portion 61 is a plate-like member having a predetermined thickness. The rib portion 61 is located at the rear in the pressing direction of the pressing device 49. The front edge of the rib portion 61 is connected to the lower surface of the pressure receiving portion 53 and the rear surface of the arm portion 60. The lower end of the rib portion 61 is connected to the upper surface of the installation portion 52. In addition, a through hole 61a that penetrates in the plate thickness direction may be formed in a location where bending stress is low, such as the center of the rib portion 61. The through hole 61a is a hole for engaging a hook or the like of a lifting device when lifting the support portion.

In this way, when the pressing device 49 is pressing the pressure-receiving portion 53, the support arm 47 can be regarded as a cantilever beam with the lower ends of the arm portion 60 and the rib portion 61 as fixed points and the pressure-receiving portion 53 as a point of action. In addition, since the arm portion 60 is curved so that the front edge of the vertical cross-sectional shape is a parabola, the support arm 47 has a beam shape with uniform strength.
The number of rib portions 61 is not limited to one. It is also possible to provide a plurality of rib portions 61. When providing a plurality of rib portions 61, they may be disposed such that the plate surfaces of adjacent rib portions 61 face each other.

As shown in Figures 1 and 2, the oscillating shaft portion 55 supports the grinding roller 13 via the journal head 45 so that it can oscillate about a central axis C that extends horizontally. The oscillating shaft portion 55 extends horizontally from both side surfaces of the installation portion 52. Since the structure of each oscillating shaft portion 55 is symmetrical with respect to the installation portion 52, the following describes one of the oscillating shaft portions 55 and omits the description of the other oscillating shaft portion 55.

The oscillating shaft portion 55 has a base portion 64 that is fixed to the installation portion 52 and a bearing holder portion 65 that is provided at the tip of the base portion 64.

As shown in FIG. 2, the base 64 extends horizontally from the side surface of the installation portion 52. As shown in FIG. 4, the cross section of the base 64 when cut along a plane intersecting the extension direction is non-circular. In detail, in the cross section, the area of the front part (the center side of the mill 10) in the pressing direction is larger than the area of the rear part (the inner peripheral surface side of the housing 11 of the mill 10) in the pressing direction. More specifically, the area of the front part 55a from the central axis C is larger than the area of the rear part 55b from the central axis C. The dashed circle in FIG. 4 illustrates a perfect circle centered on the central axis C. That is, the dashed circle illustrates a case where the area of the front part from the central axis C is the same as the area of the rear part from the central axis C. As can be understood from FIG. 4, in this embodiment, the area of the front part 55a from the central axis C is significantly larger than the area of the rear part 55b from the central axis C.
4 indicates the magnitude of the load acting on the base portion 64. That is, in this embodiment, the longer the length of the arrow from the central axis C in a direction, the greater the load acting.

As shown in FIG. 2, the base 64 is connected to the support arm 47 via the installation portion 52. The base 64 is formed so that the cross-sectional area (cross-sectional area when cut at a plane intersecting the extension direction) gradually increases toward the connection portion with the installation portion 52. Specifically, the front surface of the base 64 is a curved surface. In more detail, the front surface 64d of the base 64 is curved so that the front edge (the portion corresponding to the front surface) of the horizontal cross section is parabolic.

The base 64 also has a flange portion 64a provided at the front and a main body portion 64b provided behind the flange portion 64a, which are integral with the base 64. As shown in Figs. 2 and 4, the vertical length of the flange portion 64a is longer than the vertical length of the main body portion 64b. The vertical length of the flange portion 64a becomes shorter as it approaches the bearing holder 65. The thickness of the flange portion 64a also becomes thicker as it approaches the bearing holder 65.

The front surface 64d (surface) of the base 64 (specifically, the flange portion 64a) that faces the crushing roller 13 is connected to the mounting surface 52a of the mounting portion 52. In detail, the front surface 64d of the base 64 and the mounting surface 52a of the mounting portion 52 are smoothly connected. Specifically, the front surface 64d of the base 64 and the mounting surface 52a of the mounting portion 52 are connected to form a continuous curved surface. In other words, the front surface 64d of the base 64 and the mounting surface 52a of the mounting portion 52 are connected without bending.

The bearing holder 65 is a cylindrical member. The bearing holder 65 extends in the horizontal direction. The bearing holder 65 is supported to be swingable by a bearing (not shown) provided in the housing 11. The bearing holder 65 has a seal hole 65a formed in a location where bending stress is low, for example, along the central axis. Seal air is supplied to the seal hole 65a.
A step 64c is formed at the connection between the base 64 and the bearing holder 65. This step 64c serves as a seat for supporting the thrust load acting on the journal head 45 during operation of the mill 10.

The base 64 and the bearing holder 65 may be formed as one piece. Alternatively, the base 64 and the bearing holder 65 may be formed as separate bodies, and the base 64 and the bearing holder 65 may be fixed together. When they are formed as separate bodies, a hole into which the bearing holder 65 can be inserted may be formed in the base 64, and the bearing holder 65 inserted into the hole may be fixed with a bolt or the like. When they are formed as separate bodies, a rotation stopper (not shown) may be provided to prevent the bearing holder 65 from rotating. The rotation stopper may be configured, for example, so that the tip of a bolt or the like fixed to the base 64 comes into contact with the outer circumferential surface of the bearing holder 65 to prevent the bearing holder 65 from rotating. Alternatively, the bearing holder 65 may be provided with a groove into which the tip of a bolt can be inserted to prevent the bearing holder 65 from rotating.

In this way, when the pressing device 49 is pressing the pressure receiving portion 53, the oscillating shaft portion 55 can be considered as a beam with the bearing holder portion 65 as a fixed point and the pressure receiving portion 53 as a point of action. In addition, since the front surface of the base portion 64 is curved so that the front edge of the horizontal cross-sectional shape is a parabola, the oscillating shaft portion 55 has a beam shape with equal strength.

The stopper portion 56 protrudes downward in the vertical direction from the lower end of the installation portion 52. A stopper receiver (not shown) is provided on the peripheral wall 11b of the housing 11. When the tip of the stopper receiver abuts against the stopper portion 56, the approach of the grinding roller 13 to the upper surface of the grinding table 12 is restricted. The stopper receiver is composed of, for example, a bolt and a nut, and the tip position is adjusted by adjusting the amount of screwing of the bolt, thereby adjusting the closest position of the grinding roller 13 to the upper surface of the grinding table 12. This closest position is the position of the grinding roller 13 in an unloaded state in which no solid fuel is input into the mill 10. Note that, if the grinding table 12 and the grinding roller 13 are made of a material that is highly resistant to impact loads, the closest position may be zero (a state in which the grinding table 12 and the grinding roller 13 are in contact with each other).
The surface (surface 56a) of the stopper portion 56 facing the crushing roller 13 is connected to the installation surface 52a of the installation portion 52. In particular, the surface 56a of the stopper portion 56 and the installation surface 52a of the installation portion 52 are smoothly connected. Specifically, the surface 56a of the stopper portion 56 and the installation surface 52a of the installation portion 52 are connected to form a continuous curved surface. In other words, the surface 56a of the stopper portion 56 and the installation surface 52a of the installation portion 52 are connected without bending.

Next, the behavior of the crushing roller 13 and the journal head 45 according to the present disclosure will be described.
The pressing portion presses from the outside of the housing 11 toward the inside of the housing 11. When the pressing portion presses the journal head 45, it oscillates around the central axis C. When the journal head 45 oscillates, the crushing roller 13 also oscillates. When the crushing roller 13 oscillates, it is pressed toward the upper surface of the rotating crushing table 12. As a result, the solid fuel on the crushing table 12 is crushed and pulverized between the crushing roller 13 and the crushing table 12. At this time, the load applied by the crushing roller 13 is adjusted by the stopper portion 56.

According to this embodiment, the following advantageous effects are obtained.
In this embodiment, when the pressing device 49 presses the journal head 45, the crushing roller 13 swings and is pressed against the crushing table 12. At this time, a compressive load acts on the arm portion 60 as shown by the arrow A3 in FIG. 2. Therefore, for example, if the arm portion 60 is a plate-shaped rib or the like, deformation such as buckling may occur. In this embodiment, the arm portion 60 on which the compressive load acts is curved. This makes the stress generated in the arm portion 60 when the pressing device 49 presses the journal head 45 uniform. Therefore, the strength of the arm portion 60 can be improved to make the arm portion 60 less likely to deform. Therefore, the strength of the journal head 45 can be improved. In addition, when the strength is the same as that of the conventional one, the weight of the journal head 45 can be reduced.
On the other hand, when the pressing device 49 presses the journal head 45 and the grinding roller 13 is pressed against the grinding table 12, a tensile load acts on the rib portion 61 as shown by the arrow A4 in FIG. 2. Buckling does not occur in the portion where the tensile load acts. Therefore, even a plate-like member such as a rib is unlikely to deform. In this way, by making the portion that is unlikely to deform into a plate-like rib, it is possible to reduce the weight of the journal head 45 while suppressing deformation of the journal head 45.
The reduction in weight makes it possible to reduce the cost of manufacturing the mill 10. Furthermore, the reduction in weight improves handling during transportation and installation. Furthermore, the operating force required to hoist the journal head 45 during maintenance, such as with a chain block, can be reduced, improving maintainability. Furthermore, it becomes possible to keep the capacity (lifting load capacity) of the crane used for maintenance of the mill 10 small, making it possible to reduce equipment costs.

The pressure-receiving portion 53 also receives a pressing force from the pressing device 49. Therefore, the load acting on the pressure-receiving portion 53 from the pressing device 49 is greater than that on the arm portion 60. In this embodiment, the cross-sectional area of the pressure-receiving portion 53 is greater than that of the arm portion 60. Therefore, it is possible to make it difficult for the pressure-receiving portion 53, which is subjected to a large load, to deform. This makes it possible to improve the strength of the journal head 45.

In addition, the load acting when pressed by the pressing device 49 gradually decreases from the pressure-receiving surface 53a toward the connection with the arm portion 60. In this embodiment, the cross-sectional area of the pressure-receiving portion 53 gradually decreases from the pressure-receiving surface 53a toward the connection with the arm portion 60. Therefore, the cross-sectional area of the pressure-receiving portion 53 corresponds to the load acting thereon, and the pressure-receiving portion 53 can be made lighter while suppressing deformation of the pressure-receiving portion 53.

In this embodiment, when the pressing device 49 presses the journal head 45, the crushing roller 13 swings and is pressed against the crushing table 12. At this time, a resultant force of the pressing load of the pressing device 49 and a reaction force of the load when the crushing roller 13 crushes the solid fuel acts on the swing shaft portion 55. This resultant force is along the pressing direction of the pressing device 49. Therefore, when the pressing device 49 presses the journal head 45, a load that tries to deform the swing shaft portion 55 in the pressing direction acts on the swing shaft portion 55. Note that the direction along the pressing direction does not only mean a direction parallel to the pressing direction, but also includes a direction that forms a predetermined angle with respect to a direction parallel to the pressing direction.
In this embodiment, the cross-sectional area of the oscillating shaft 55, when cut by a plane intersecting the extension direction, is larger at the front part in the pressing direction of the pressing device 49 than at the rear part in the pressing direction. This makes it difficult for the oscillating shaft 55 to deform forward in the pressing direction. Therefore, the strength of the oscillating shaft 55 can be improved when the pressing device 49 presses the journal head 45.
In addition, since the cross-sectional area is smaller at the rear portion where the load acting when the pressing device 49 presses the journal head 45 is smaller, the oscillating shaft portion 55 can be made lighter than when the cross-sectional area of the rear portion is the same as that of the front portion.

In addition, in this embodiment, when the pressing device 49 presses the journal head 45, a load is input to the oscillating part via the pressure receiving part 53 and the arm part 60. At this time, the load acting on the oscillating part increases as it approaches the connection part with the arm part 60. In this embodiment, the cross-sectional area of the oscillating shaft part 55 gradually increases toward the connection part with the arm part 60. As a result, the strength of the oscillating shaft part 55 increases as it approaches the connection part with the arm part 60. Therefore, since the cross-sectional area of the oscillating shaft part 55 corresponds to the applied load, it is possible to reduce the weight of the oscillating shaft part 55 while suppressing deformation of the oscillating shaft part 55.

In addition, in this embodiment, the arm portion 60 and the installation portion 52 are connected so that the front surface 60a of the arm portion 60 and the installation surface 52a of the installation portion 52 form a continuous curved surface. This makes it possible to smoothly change the cross-sectional area of the section from the arm portion 60 to the installation surface 52a in the load path shown by the dashed line L1 in FIG. 5. This makes it possible to suppress stress concentration at the connection portion between the arm portion 60 and the installation portion 52, thereby improving the strength of the connection portion. This therefore makes it possible to improve the strength of the journal head 45.

In addition, in this embodiment, the base 64 of the oscillating shaft portion 55 and the installation portion 52 are connected so that the front surface 64d of the base 64 of the oscillating shaft portion 55 and the installation surface 52a of the installation portion 52 form a continuous curved surface. This makes it possible to smoothly change the cross-sectional area of the section from the oscillating shaft portion 55 to the installation surface 52a in the load path shown by the dashed line L2 in FIG. 5. This makes it possible to suppress stress concentration at the connection portion between the oscillating shaft portion 55 and the installation portion 52, thereby improving the strength of the connection portion. This therefore makes it possible to improve the strength of the journal head 45.

In addition, in this embodiment, the stopper portion 56 and the installation portion 52 are connected so that the surface 56a of the stopper portion 56 and the installation surface 52a of the installation portion 52 form a continuous curved surface. This makes it possible to smoothly change the cross-sectional area of the section from the stopper portion 56 to the installation surface 52a. This makes it possible to suppress stress concentration at the connection portion between the stopper portion 56 and the installation portion 52, thereby improving the strength of the connection portion. This therefore makes it possible to improve the strength of the journal head 45.

The present disclosure is not limited to the above-described embodiment, and various modifications are possible without departing from the spirit and scope of the present disclosure.
For example, in the above-described embodiment, a mill according to the present invention is used, but the solid fuel may be other solid fuels such as biomass fuel or PC (Petroleum Coke) fuel generated during oil refining, and these solid fuels may be mixed and used.

For example, the journal head 45 may be provided with an inclined structure to prevent accumulation of pulverized solid fuel. The inclined structure may be provided anywhere where solid fuel accumulates. For example, the inclined structure may be provided on the upper surface of the arm portion 60 or the upper surface of the oscillating shaft portion 55. The inclined structure has an upper surface that is an inclined surface. The inclined surface is formed so that the angle with respect to the horizontal plane is larger than the angle of repose of the fine powder of the solid fuel. The inclined structure may be cast together with the journal head 45 and formed integrally. Alternatively, it may be manufactured separately from the journal head 45 and joined to the journal head 45 by bolts, welding, etc.

For example, a plate may be attached to the pressure-receiving surface 53a of the pressure-receiving portion 53 to prevent wear caused by mutual contact. A plate for preventing wear may also be attached to the portion of the stopper portion 56 that comes into contact with the stopper device. During maintenance, wear on the plate is checked, and if wear is confirmed, only the plate is replaced, making it unnecessary to replace or repair the entire journal head 45.

Also, for example, as shown in Figs. 6 and 7, a protector 70 may be provided to prevent wear caused by the impact of pulverized solid fuel on the journal head 45. The protector 70 has an apron-shaped panel 71 that is detachably attached to the base 64 of the journal head 45, and a shield 72 whose base end is fixed to the apron-shaped panel 71. The shield 72 is arranged so as to surround the lower part of the journal shaft portion 51. The apron-shaped panel 71 and the shield 72 are made of steel (e.g., SS400, low alloy steel, etc.). The apron-shaped panel 71 is a flat plate and is attached to the base 64 of the journal head 45 so as to extend around the base 64. The apron-shaped panel 71 not only functions as an attachment member for attaching the shield 72 to the base 64, etc., but also functions to protect the base 64, etc. from the impact of fine powder. The protector 70 is attached to a mounting seat 73 provided on the journal head 45. The mounting seat 73 is provided on the front surface 64d of the base 64. The protector 70 (specifically, the apron-shaped panel 71) is fixed to the mounting seat 73 by bolts 74. A protector ring 75 is formed around the bolts 74 to protect the heads of the attached bolts 74 from impact with fine powder.

The pulverizer, the power generation plant, and the method of operating the pulverizer described in the above-described embodiments can be understood, for example, as follows.
A crusher according to one aspect of the present disclosure includes a housing (11) forming an outer shell, a crushing table (12) housed inside the housing (11) and having a top surface to which solid fuel is supplied, a crushing roller (13) housed inside the housing (11) and crushing the solid fuel supplied to the top surface of the crushing table (12), a support part (45) that supports the crushing roller (13) so as to be swingable about a central axis line extending along a horizontal direction relative to the housing (11), and a support member ...). and a pressing portion (49) that presses the support portion (45) so as to oscillate the support portion (45) and press it against the grinding table (12), the support portion (45) has a pressure-receiving portion (53) that is pressed by the pressing portion (49) and a connection portion (47) that is provided between the pressure-receiving portion (53) and the grinding roller (13), and the connection portion (47) is curved so that a front edge portion (60) located at the front portion in the pressing direction of the pressing portion (49) protrudes forward in the pressing direction.

In the above configuration, when the pressing portion presses the support portion, the grinding roller swings and is pressed against the grinding table. At this time, a compressive load acts on the front edge of the connection portion in the pressing direction (swing direction). In the above configuration, the front edge of the connection portion on which the compressive load acts is curved. This makes it possible to equalize the stress generated at the front edge of the connection portion when the pressing portion presses the support portion. This makes it possible to improve the strength of the connection portion and make it less likely to deform. This makes it possible to improve the strength of the support portion. Furthermore, when the strength is the same as before, the weight of the support portion can be reduced.

In addition, in the crusher according to one embodiment of the present disclosure, the pressure-receiving portion (53) has a larger cross-sectional area when cut at a plane intersecting the swing direction of the support portion (45) than the connection portion (47).

The pressure-receiving portion receives a pressing force from the pressing portion. Therefore, the load acting on the pressure-receiving portion from the pressing portion is greater than that acting on the arm portion. In the above configuration, the cross-sectional area of the pressure-receiving portion is greater than that of the arm portion. Therefore, it is possible to make it difficult for the pressure-receiving portion, which is subjected to a large load, to deform. This makes it possible to improve the strength of the support portion.

In addition, in the crusher according to one embodiment of the present disclosure, the cross-sectional area of the pressure-receiving portion (53) gradually decreases from the pressure-receiving surface (53a) pressed by the pressing portion (49) toward the connection portion with the connection portion (47).

The load acting when pressed by the pressing portion gradually decreases from the pressure receiving surface toward the connection portion with the arm portion. In the above configuration, the cross-sectional area of the pressure receiving portion gradually decreases from the pressure receiving surface toward the connection portion with the arm portion. Therefore, the cross-sectional area of the pressure receiving portion corresponds to the load acting thereon, and the pressure receiving portion can be made lighter while suppressing deformation of the pressure receiving portion.

In addition, a crusher according to one embodiment of the present disclosure includes a housing (11) forming an outer shell, a crushing table (12) housed inside the housing (11) and having a top surface to which solid fuel is supplied, a crushing roller (13) housed inside the housing (11) for crushing the solid fuel supplied to the top surface of the crushing table (12), and a support (14) for supporting the crushing roller (13) so that it can swing about a central axis extending horizontally relative to the housing (11). and a pressing part (49) that presses the support part (45) so as to oscillate the grinding roller (13) and press it against the grinding table (12), the support part (45) has a swing shaft part (55) that is swingably supported on the housing (11), and the swing shaft part (55) has a cross-sectional area, when cut at a plane intersecting the extension direction, that is larger at the front part in the pressing direction of the pressing part (49) than at the rear part in the pressing direction.

In the above configuration, when the pressing portion presses the support portion, the crushing roller swings and is pressed against the crushing table. At this time, the resultant force of the pressing load of the pressing portion and the reaction force of the load when the crushing roller crushes the solid fuel acts on the swing shaft portion. This resultant force is along the pressing direction of the pressing portion. Therefore, when the pressing portion presses the support portion, a load that tries to deform the swing shaft portion in the pressing direction acts on the swing shaft portion.
In the above configuration, the cross-sectional area of the front part of the pivot shaft in the pressing direction of the pressing portion is larger than that of the rear part in the pressing direction, when cut by a plane intersecting the extension direction. This makes it difficult for the pivot shaft to deform forward in the pressing direction. Therefore, the strength of the pivot shaft can be improved when the pressing portion presses the support portion.
In addition, since the cross-sectional area is smaller at the rear portion where the load acting when the pressing portion presses the support portion is smaller, the oscillating shaft portion can be made lighter than when the cross-sectional area of the rear portion is the same as that of the front portion.

In addition, in the crusher according to one embodiment of the present disclosure, the support portion (45) has a pressure-receiving portion (53) that is pressed by the pressing portion (49) and a connection portion (47) that is provided between the pressure-receiving portion (53) and the crushing roller (13), and the swing shaft portion (55) is connected to the connection portion (47), and the cross-sectional area gradually increases toward the connection portion with the connection portion (47).

In the above configuration, when the pressing portion presses the support portion, a load is input to the oscillating portion via the pressure receiving portion and the arm portion. At this time, the load acting on the oscillating portion increases as it approaches the connection portion with the arm portion. In the above configuration, the cross-sectional area of the oscillating shaft portion gradually increases toward the connection portion with the arm portion. This increases the strength of the oscillating shaft portion as it approaches the connection portion with the arm portion. Therefore, since the cross-sectional area of the oscillating shaft portion corresponds to the load acting on it, it is possible to reduce the weight of the oscillating shaft portion while suppressing deformation of the oscillating shaft portion.

In addition, a crusher according to one aspect of the present disclosure includes a housing (11) forming an outer shell, a crushing table (12) housed inside the housing (11) and having a top surface to which solid fuel is supplied, a crushing roller (13) housed inside the housing (11) and crushing the solid fuel supplied to the top surface of the crushing table (12), a support section (45) that supports the crushing roller (13) so that it can swing around a central axis extending along a horizontal direction relative to the housing (11), and a support section (45) that supports the crushing roller (13) so that it can swing around the central axis extending along a horizontal direction relative to the housing (11) and presses the crushing roller (13) against the crushing table (12). and a pressing portion (49) that presses the support portion (45). The support portion (45) has a shaft portion (51) that rotatably supports the crushing roller (13), a mounting portion (52) on which the shaft portion (51) is mounted, a pressure-receiving portion (53) that is pressed by the pressing portion (49), and a connection portion (47) that is provided between the pressure-receiving portion (53) and the mounting portion (52). The connection portion (47) and the mounting portion (52) are connected so that the surface (60a) of the connection portion (47) and the surface (52a) of the mounting portion (52) form a continuous curved surface.

In the above configuration, the arm portion and the installation portion are connected so that the surface of the arm portion and the surface of the installation portion form a continuous curved surface. This makes it possible to suppress stress concentration at the connection portion between the arm portion and the installation portion, thereby improving the strength of the connection portion. Therefore, the strength of the support portion can be improved.

In addition, in the crusher according to one embodiment of the present disclosure, the support portion (45) has a swing shaft portion (55) that is connected to the installation portion (52) and supported to be swingable on the housing (11), and the swing shaft portion (55) and the installation portion (52) are connected such that the surface (55a) of the swing shaft portion (55) and the surface (52a) of the installation portion (52) form a continuous curved surface.

In the above configuration, the oscillating shaft portion and the installation portion are connected so that the surface of the oscillating shaft portion and the surface of the installation portion form a continuous curved surface. This makes it possible to suppress stress concentration at the connection portion between the oscillating shaft portion and the installation portion, thereby improving the strength of the connection portion. Therefore, the strength of the support portion can be improved.

A power generation plant according to one embodiment of the present disclosure includes a pulverizer (10) according to any one of claims 1 to 7, a boiler (200) that burns the solid fuel pulverized by the pulverizer (10) to generate steam, and a power generation unit that generates power using the steam generated by the boiler (200).

In addition, a method of operating a crusher according to one aspect of the present disclosure includes the crusher (10), which includes a housing (11) forming an outer shell, a crushing table (12) housed inside the housing (11) and having a top surface to which solid fuel is supplied, a crushing roller (13) housed inside the housing (11) and crushing the solid fuel supplied to the top surface of the crushing table (12), a support part (45) that supports the crushing roller (13) so that it can swing about a central axis extending along a horizontal direction relative to the housing (11), and a crushing roller (13) that swings the crushing roller (13) to the housing (11). and a pressing portion (49) that presses the support portion (45) so as to press it against the crushing table (12). The support portion (45) has a pressure receiving portion (53) that is pressed by the pressing portion (49) and a connection portion (47) that is provided between the pressure receiving portion (53) and the crushing roller (13). The connection portion (47) has a front edge portion (60) that is located at the front in the pressing direction of the pressing portion (49) and is curved so as to protrude forward in the pressing direction. The process includes crushing the solid fuel with the crushing roller (13).

In addition, a method of operating a crusher according to one embodiment of the present disclosure includes the following: the crusher (10) includes a housing (11) forming an outer shell; a crushing table (12) housed inside the housing (11) and having a top surface to which solid fuel is supplied; a crushing roller (13) housed inside the housing (11) and crushing the solid fuel supplied to the top surface of the crushing table (12); a support part (45) that supports the crushing roller (13) so that it can swing around a central axis extending horizontally relative to the housing (11); and a pressing portion (49) that presses the support portion (45) so as to oscillate the crushing roller (13) and press it against the crushing table (12), the support portion (45) has a swing shaft portion (55) that is swingably supported on the housing (11), and the swing shaft portion (55) has a cross-sectional area, when cut on a plane intersecting the extension direction, that is larger at the front portion in the pressing direction of the pressing portion (49) than at the rear portion in the pressing direction, and the process of crushing the solid fuel with the crushing roller (13) is provided.

In addition, in a method of operating a crusher according to one aspect of the present disclosure, the crusher (10) includes a housing (11) forming an outer shell, a crushing table (12) housed inside the housing (11) and having a top surface to which solid fuel is supplied, a crushing roller (13) housed inside the housing (11) and crushing the solid fuel supplied to the top surface of the crushing table (12), a support section (45) that supports the crushing roller (13) so as to be swingable about a central axis extending along a horizontal direction relative to the housing (11), and a support section (46) that supports the crushing roller (13) so as to be swingable about a central axis extending along a horizontal direction relative to the housing (11) and to press the crushing roller (13) against the crushing table (12). and a pressing portion (49) that presses the support portion (45), the support portion (45) has a shaft portion (51) that rotatably supports the crushing roller (13), a mounting portion (52) on which the shaft portion (51) is mounted, a pressure-receiving portion (53) that is pressed by the pressing portion (49), and a connection portion (47) that is provided between the pressure-receiving portion (53) and the mounting portion (52), the connection portion (47) and the mounting portion (52) are connected so that the surface (60a) of the connection portion (47) and the surface (52a) of the mounting portion (52) form a continuous curved surface, and the process includes a step of crushing the solid fuel with the crushing roller (13).

1: Power plant 10: Mill 11: Housing
11b: Peripheral wall 12: Grinding table 13: Grinding roller 14: Drive unit 15: Mill motor 16: Rotary classifier 16a: Blade 17: Fuel supply unit 18: Classifier motor 19: Outlet port 20: Coal feeder 21: Bunker 22: Conveyor unit 23: Coal feeder motor 24: Downspout 30: Blower unit 30a: Hot gas flow path 30b: Cold gas flow path 30c: Hot gas damper 30d: Cold gas damper 31: Primary air fan 32: Forced draft fan 34: Heat exchanger 40: Status detection unit 41: Bottom surface unit 42: Ceiling unit 45: Journal head (support unit)
47: Support arm (connection part)
49: Pressing device (pressing part)
50: Control unit 51: Journal shaft portion (shaft portion)
52: Installation portion 52a: Installation surface 53: Pressure receiving portion 53a: Pressure receiving surface 55: Swing shaft portion 56: Stopper portion 56a: Surface 60: Arm portion (front edge portion)
60a: Front surface 60b: Rear surface 61: Rib portion 64: Base portion 64a: Flange portion 64b: Main body portion 64c: Step portion 64d: Front surface 65: Bearing holder portion 100: Solid fuel pulverizer 100a: Primary air passage 100b: Pulverized fuel supply passage 200: Boiler 210: Furnace 220: Burner

Claims (10)

A housing forming an outer shell;
a grinding table housed inside the housing and having an upper surface to which solid fuel is supplied;
a crushing roller housed inside the housing and configured to crush the solid fuel supplied to the upper surface of the crushing table;
a support portion that supports the crushing roller with respect to the housing so as to be swingable about a central axis that extends along a horizontal direction;
a pressing portion that presses the support portion so as to oscillate the crushing roller and press it against the crushing table,
the support portion has a pressure receiving portion pressed by the pressing portion, and a connection portion provided between the pressure receiving portion and the crushing roller,
The connection portion is
A front edge portion is a plate-like member having a predetermined thickness and is located at the front of the pressing portion in the pressing direction;
A plate-like member having a predetermined thickness, and a rib portion located at a rear portion;
having
The rib portion is connected to the rear surface of the leading edge portion,
The plate thickness of the front edge portion is formed to be thicker than the plate thickness of the rib portion,
A crusher, wherein the connecting portion has a front edge portion curved so as to protrude forward in the pressing direction. 2. The crusher according to claim 1, wherein the pressure-receiving portion has a cross-sectional area larger than that of the connecting portion when cut by a plane perpendicular to the swing direction of the support portion. The crusher according to claim 2, wherein the cross-sectional area of the pressure-receiving part gradually decreases from the pressure-receiving surface pressed by the pressing part toward the connection part with the connecting part. A housing forming an outer shell;
a grinding table housed inside the housing and having an upper surface to which solid fuel is supplied;
a crushing roller housed inside the housing and configured to crush the solid fuel supplied to the upper surface of the crushing table;
a support portion that supports the crushing roller with respect to the housing so as to be swingable about a central axis that extends along a horizontal direction;
a pressing portion that presses the support portion so as to oscillate the crushing roller and press it against the crushing table,
The support portion has a shaft portion that rotatably supports the crushing roller, a mounting portion on which the shaft portion is mounted, and a swing shaft portion that is swingably supported by the housing,
The pivot shaft portion has a base portion fixed to the installation portion and a bearing holder portion which is a cylindrical member and is provided at a tip end of the base portion,
A crusher in which a cross-sectional area of a front portion of the base in the pressing direction of the pressing portion is larger than a cross-sectional area of a rear portion of the base in the pressing direction when cut along a plane perpendicular to the extension direction. the support portion has a pressure receiving portion pressed by the pressing portion, and a connection portion provided between the pressure receiving portion and the crushing roller,
5. The crusher according to claim 4, wherein the swing shaft portion is connected to the connection portion, and the cross-sectional area of the swing shaft portion gradually increases toward a portion where the swing shaft portion is connected to the connection portion. A housing forming an outer shell;
a grinding table housed inside the housing and having an upper surface to which solid fuel is supplied;
a crushing roller housed inside the housing and configured to crush the solid fuel supplied to the upper surface of the crushing table;
a support portion that supports the crushing roller with respect to the housing so as to be swingable about a central axis that extends along a horizontal direction;
a pressing portion that presses the support portion so as to oscillate the crushing roller and press it against the crushing table,
The support portion has a shaft portion that rotatably supports the grinding roller, an installation portion having an installation surface facing the grinding roller and on which the shaft portion is installed, and a oscillating shaft portion having a front surface facing the grinding roller and connected to the installation portion and supported oscillatingly on the housing , and the oscillating shaft portion and the installation portion are connected so that the front surface, which is the surface of the oscillating shaft portion, and the installation surface, which is the surface of the installation portion, form a continuous curved surface . A crusher according to any one of claims 1 to 6 ,
a boiler that burns the solid fuel pulverized by the pulverizer to generate steam;
a power generation unit that generates electricity using the steam generated by the boiler. A method for operating a grinding machine, comprising the steps of:
The crusher comprises:
A housing forming an outer shell;
a grinding table housed inside the housing and having an upper surface to which solid fuel is supplied;
a crushing roller housed inside the housing and configured to crush the solid fuel supplied to the upper surface of the crushing table;
a support portion that supports the crushing roller with respect to the housing so as to be swingable about a central axis that extends along a horizontal direction;
a pressing portion that presses the support portion so as to oscillate the crushing roller and press it against the crushing table,
the support portion has a pressure receiving portion pressed by the pressing portion, and a connection portion provided between the pressure receiving portion and the crushing roller,
The connection portion is
A front edge portion is a plate-like member having a predetermined thickness and is located at the front of the pressing portion in the pressing direction;
A plate-like member having a predetermined thickness, and a rib portion located at a rear portion;
having
The rib portion is connected to the rear surface of the leading edge portion,
The plate thickness of the front edge portion is formed to be thicker than the plate thickness of the rib portion,
The connecting portion is curved so that the front edge portion protrudes forward in the pressing direction,
A method of operating a pulverizer comprising the step of pulverizing the solid fuel with the pulverizing rollers. A method for operating a grinding machine, comprising the steps of:
The crusher comprises:
A housing forming an outer shell;
a grinding table housed inside the housing and having an upper surface to which solid fuel is supplied;
a crushing roller housed inside the housing and configured to crush the solid fuel supplied to the upper surface of the crushing table;
a support portion that supports the crushing roller with respect to the housing so as to be swingable about a central axis that extends along a horizontal direction;
a pressing portion that presses the support portion so as to oscillate the crushing roller and press it against the crushing table,
The support portion has a shaft portion that rotatably supports the crushing roller, a mounting portion on which the shaft portion is mounted, and a swing shaft portion that is swingably supported by the housing,
The pivot shaft portion has a base portion fixed to the installation portion and a bearing holder portion which is a cylindrical member and is provided at a tip end of the base portion,
The base portion has a cross-sectional area, when cut along a plane perpendicular to the extension direction, that is larger in a front portion in a pressing direction of the pressing portion than in a rear portion in the pressing direction,
A method of operating a pulverizer comprising the step of pulverizing the solid fuel with the pulverizing rollers. A method for operating a grinding machine, comprising the steps of:
The crusher comprises:
A housing forming an outer shell;
a grinding table housed inside the housing and having an upper surface to which solid fuel is supplied;
a crushing roller housed inside the housing and configured to crush the solid fuel supplied to the upper surface of the crushing table;
a support portion that supports the crushing roller with respect to the housing so as to be swingable about a central axis that extends along a horizontal direction;
a pressing portion that presses the support portion so as to oscillate the crushing roller and press it against the crushing table,
the support portion has a shaft portion that rotatably supports the grinding roller, a mounting portion having a mounting surface facing the grinding roller and on which the shaft portion is mounted, and a swing shaft portion having a front surface facing the grinding roller and connected to the mounting portion and supported swingably on the housing , the swing shaft portion and the mounting portion being connected such that the front surface, which is the surface of the swing shaft portion, and the mounting surface, which is the surface of the mounting portion, form a continuous curved surface ,
A method of operating a pulverizer comprising the step of pulverizing the solid fuel with the pulverizing rollers.