JP2019076876A - Solid fuel supply pipe and crushing device, and solid fuel supply method - Google Patents

Abstract

To reduce an occupied space and reduce the weight compared to a structure formed of a fixing part having a large diameter as a whole, and facilitate an installation work compared to a structure formed of a rotation part as a whole.SOLUTION: A solid fuel supply pipe 20 includes a tubular fixing type supply pipe 22 constituting an upstream side in a flow direction of a solid fuel, and a tubular rotary type supply pipe 21 rotating around a central axis of the fixing type supply pipe 22. The upstream side of the rotary type supply pipe 21 is connected to the downstream side of the fixing type supply pipe 22, and the downstream side of the rotary type supply pipe 21 is connected to a crusher 5. The rotary type supply pipe 21 has a scraper 29 which is stored inside of the rotary type supply pipe 21 and is arranged along an inner peripheral surface of the rotary type supply pipe 21, and is formed so that its outer diameter is smaller than that of the fixing type supply pipe 22.SELECTED DRAWING: Figure 2

Description

  The present disclosure relates to a solid fuel supply pipe for supplying solid fuel from a solid fuel supply machine to a pulverizer, a pulverizing apparatus provided with the solid fuel supply pipe, and a solid fuel supply method using the solid fuel supply pipe.

  In a thermal power generation facility or the like, solid carbon containing carbon such as coal or biomass used is pulverized into fine powder by a pulverizer (mill) and supplied to a combustion apparatus of a boiler. The mill pulverizes the solid fuel supplied from the solid fuel supply pipe to the pulverizing table by chewing between the pulverizing table and the pulverizing roller, and is pulverized by the carrier gas supplied from the outer periphery of the pulverizing table to become fine powder The solid fuel is classified into small particle size by a classifier and conveyed to the combustion device of the boiler.

  Solid fuel adheres to the inner wall of a solid fuel supply pipe that supplies solid fuel to the mill. If solid fuel adheres to the inner wall, it is not preferable because it may block the solid fuel supply pipe.

  For example, when a small-sized mill is adopted, the diameter of the connection point between the solid fuel supply pipe and the mill is fixed due to the design of the mill, and it may not be possible to provide a solid fuel supply pipe having a large inner diameter. Therefore, in a small-sized mill with a small internal diameter, the solid fuel attached to the inner wall of the solid fuel supply pipe may not drop due to its own weight, and the solid fuel supply pipe may be blocked. In such a case, a scraper may be passed through the inside of the solid fuel supply pipe, and the solid fuel supply pipe may be rotated to scrape off the solid fuel adhering to the inner wall of the solid fuel supply pipe (for example, patent document 1).

Patent No. 3263431

  However, when the solid fuel supply pipe has a diameter such that the solid fuel adhering to the inner wall falls by its own weight before the solid fuel supply pipe is closed, the occupied space of the solid fuel supply pipe becomes large, and The weight of the solid fuel supply pipe may increase. Further, as in Patent Document 1, a scraper is passed through the solid fuel supply pipe throughout the solid fuel supply pipe, and the solid fuel supply pipe is rotated to scrape off the solid fuel adhering to the inner wall of the solid fuel supply pipe. When the device is provided, the internal diameter of the solid fuel supply pipe can be reduced to reduce the space occupied by the solid fuel supply pipe, and the weight of the solid fuel supply pipe can be reduced. However, the rotating solid fuel supply The length of the pipe is increased, which may complicate the installation work of the solid fuel supply pipe.

  The present disclosure has been made in view of such circumstances, and it is a fixing portion that does not rotate the solid fuel supply pipe about the axial direction as a central axis, and a rotating portion that rotates the axial direction as the rotational axis. Compared with a structure that is divided and configured entirely with a fixed portion with a large diameter, the occupied space can be reduced and the weight can be reduced, and compared with a structure configured with a whole rotated portion, installation work can be performed. It is an object of the present invention to provide a solid fuel supply pipe which can be facilitated, a pulverizing apparatus provided with the solid fuel supply pipe, and a solid fuel supply method.

In order to solve the above-mentioned subject, a solid fuel feed pipe and a grinding device of this indication, and a solid fuel feed method adopt the following means.
The solid fuel supply pipe according to an aspect of the present disclosure is a solid fuel supply pipe in which solid fuel flows and supplies the solid fuel from the solid fuel supply device to the pulverizer, and the flow direction upstream of the solid fuel A tubular fixed portion constituting a side, and a tubular rotating portion rotated around a central axis along the axial direction of the solid fuel supply pipe, the upstream side of the rotating portion being downstream of the fixed portion The rotary unit is connected to the downstream side of the rotary unit and connected to the crusher, and the rotary unit has a scraper which is accommodated inside the rotary unit and arranged along the inner peripheral surface of the rotary unit. The outer diameter is smaller than that of the fixed portion.

In the above configuration, the solid fuel supply pipe has the fixed portion and the rotating portion whose outer diameter is smaller than that of the fixed portion.
Thereby, the pulverizer side of the solid fuel supply pipe can be miniaturized as compared with a structure in which the entire solid fuel supply pipe is configured by the fixed portion. Therefore, the space occupied by the solid fuel supply pipe can be reduced, and the layout in the vicinity of the solid fuel supply pipe can be improved. Further, the weight of the entire solid fuel supply pipe can be reduced as compared with the structure in which the entire solid fuel supply pipe is configured by the fixed portion. Thereby, the installation work of the solid fuel supply pipe can be facilitated.
On the other hand, compared with the structure which comprises the whole solid fuel supply pipe | tube by a rotation part, the length of a rotation part becomes short. Thereby, the driving force at the time of rotating a rotation part can be reduced. In addition, when installing the rotating portion, the relative position between the rotating portion and the scraper so that the scraper is along the inner circumferential surface of the rotating portion in order to prevent distortion in the rotation path during rotation. The centering operation needs to be performed when the rotary unit is installed in order to set the position of. In such an alignment operation, precision is required as the length of the rotating portion is longer. However, in the above configuration, since the length of the rotating portion is shorter, centering operation of the rotating portion can be easily performed. it can. Thereby, compared with the structure which comprises the whole solid fuel supply pipe by a rotation part, the installation operation | work of a solid fuel supply pipe can be facilitated.

  Further, in the solid fuel supply pipe according to an aspect of the present disclosure, a rotary valve may be provided in the fixed portion.

In the above configuration, a rotary valve is provided. As a result, the transfer gas and the pulverized fuel which flowed from the inside of the pulverizer into the solid fuel supply pipe are blocked by the rotary valve. Therefore, the carrier gas in the crusher and the pulverized fuel flow back through the solid fuel supply pipe (that is, flow in the direction opposite to the flow direction of the solid fuel) and blow off upstream of the solid fuel supply pipe. Can be prevented.
In addition, it is difficult to provide a rotary valve provided with a drive mechanism on a rotating portion that rotates around a central axis along the axial direction of the solid fuel supply pipe. In the above configuration, since the rotary valve is provided in the fixed portion, the solid fuel supply pipe can be configured to have the rotary portion and be provided with the rotary valve. Therefore, the space occupied by the solid fuel supply pipe can be reduced and the weight can be reduced, and the carrier gas in the pulverizer and the pulverized fuel can be prevented from being blown upstream of the solid fuel supply pipe.

  In the solid fuel supply pipe according to an aspect of the present disclosure, the length of the fixed portion may be shorter than the length of the rotating portion.

In the above configuration, since the length of the fixed portion having a large diameter is made shorter than the length of the rotating portion, the area for miniaturizing the solid fuel supply pipe can be increased. Thereby, compared with the structure which comprises the whole solid fuel supply pipe in a fixing | fixed part, the occupied space of a solid fuel supply pipe can be reduced, and the layout property of solid fuel supply pipe vicinity can be improved. In addition, the weight of the entire solid fuel supply pipe can be reduced. Thereby, the installation work of the solid fuel supply pipe can be facilitated.
The length of the fixed portion is more preferably 20% or more and less than 50% of the total length of the solid fuel supply pipe.

  In the solid fuel supply pipe according to one aspect of the present disclosure, when the rotary valve is provided, the length of the fixed portion may be longer than the length of the rotating portion.

In the above configuration, since the rotary valve is provided as a part of the fixing portion, the length of the fixing portion is long. In addition, when the length of the rotary supply pipe is increased and the fixed portion is shortened, the installation position of the rotary valve is increased and the maintainability is reduced. Therefore, the longer length of the fixed portion is preferable. For this reason, the length of the fixed part is made longer than the length of the rotating part. In other words, the length of the rotating part is shorter than the length of the fixed part. Thereby, the motive power required for rotation of a rotation part can be reduced.
In addition, when installing the rotating portion, the relative position between the rotating portion and the scraper so that the scraper is along the inner circumferential surface of the rotating portion in order to prevent distortion in the rotation path during rotation. The centering operation needs to be performed when the rotary unit is installed in order to set the position of. In such an alignment operation, precision is required as the length of the rotating portion is longer. However, in the above configuration, since the length of the rotating portion is shorter, centering operation of the rotating portion can be easily performed. it can. Thereby, the installation work of the solid fuel supply pipe can be facilitated.
The length of the fixed portion is more preferably 50% or more and longer than or equal to 50% of the entire length of the solid fuel supply pipe.

  Further, in the solid fuel supply pipe according to an aspect of the present disclosure, a reduced diameter portion whose diameter decreases toward the downstream side in the flow direction is formed at the connection portion between the fixed portion and the rotating portion. A wear resistant portion may be provided on the inner circumferential surface of the reduced diameter portion.

  Since the rotating portion is formed to have a diameter smaller than that of the fixed portion, a portion of the solid fuel flowing through the inside of the fixed portion (in particular, the solid fuel flowing near the inner peripheral surface of the fixed portion) It collides with the inner surface. In the above configuration, the wear-resistant portion is provided at the reduced diameter portion. Thereby, wear of the inner peripheral surface of the reduced diameter portion due to the collision of the solid fuel can be suppressed.

  Further, in the solid fuel supply pipe according to one aspect of the present disclosure, an overlapping region inserted at the upstream end of the rotating portion is formed at the downstream end of the fixed portion, and the downstream end of the fixing portion The outer peripheral surface of the inner peripheral surface of the rotating portion may be separated from the inner peripheral surface of the upstream end of the rotating portion.

In the above configuration, since the outer peripheral surface of the downstream end of the fixed portion and the inner peripheral surface of the upstream end of the rotating portion are separated to form an axially overlapping region, the outer peripheral surface of the fixed portion and the rotation A gap is formed between the inner circumferential surface of the part. Therefore, when the rotating portion rotates, interference between the fixed portion and the rotating portion can be prevented.
Further, the gap formed between the outer peripheral surface of the fixed portion and the inner peripheral surface of the rotating portion in the overlapping region extends in the extending direction of the solid fuel supply pipe. As a result, even when the fixed portion moves in the extending direction of the solid fuel supply pipe, the gap is not blocked, and interference between the fixed portion and the rotating portion can be prevented. Therefore, for example, the solid fuel supply pipe extends in the vertical vertical direction, and the solid fuel is stored on the upstream side of the solid fuel supply pipe, whereby the downward load acting on the fixed portion is increased, and solid Even when the part moves downward, the gap does not close, and interference between the fixed part and the rotating part can be prevented.
Further, one end of the gap formed in the overlapping region communicates with the inside of the solid fuel supply pipe, and the other end communicates with the outside of the solid fuel supply pipe, and one end of the gap communicates with the inside of the solid fuel supply pipe Viewed from the end), the gap extends in the direction opposite to the flow direction of the solid fuel. As a result, the solid fuel can be made difficult to flow into the gap, and the solid fuel can be made difficult to flow through the gap. Therefore, it is possible to prevent the solid fuel from flowing out of the solid fuel supply pipe through the gap.

  Further, the solid fuel supply pipe according to one aspect of the present disclosure includes a seal structure for sealing a gap formed between an outer peripheral surface of the fixed portion and an inner peripheral surface of the rotating portion in the overlapping region, A seal gas may be supplied to the seal structure.

  In the above configuration, the seal structure is provided at the other end of the gap formed in the overlapping region (the end communicating with the outside of the solid fuel supply pipe), and the seal gas is supplied into the seal structure. Thereby, the seal gas pushes back the solid fuel flowing in the gap. Therefore, the solid fuel can be reliably prevented from flowing out of the solid fuel supply pipe through the gap, and the air inside the solid fuel supply pipe can be prevented from flowing out.

  A pulverizer according to an aspect of the present disclosure includes any one of the above-described solid fuel supply pipes, and a pulverizer to which the solid fuel is supplied by the solid fuel supply pipes.

  The solid fuel supply method according to an aspect of the present disclosure is a solid fuel supply pipe in which solid fuel flows and supplies the solid fuel to a crusher, and constitutes the upstream side of the flow direction of the solid fuel. A tubular stationary part and a tubular rotary part rotating around a central axis along the axial direction of the solid fuel supply pipe, the upstream side of the rotary part being connected to the downstream side of the stationary part The downstream side of the rotary unit is connectable to the crusher, and the rotary unit has a scraper housed inside the rotary unit and disposed along the inner circumferential surface of the rotary unit, It is performed by a solid fuel supply pipe whose outer diameter is smaller than that of the fixed part.

  According to the present disclosure, it is possible to reduce the occupied space and to reduce the weight as compared with a structure in which the whole is constituted by a fixed part having a large diameter, and compared with a structure in which the whole is constituted by a rotating part. Can be facilitated.

It is a schematic block diagram of a boiler installation. It is a side view of the solid fuel supply pipe concerning a 1st embodiment. It is the longitudinal cross-sectional view which showed typically the connection part of the fixed feed pipe of FIG. 2, and a rotary feed pipe. It is an enlarged view of the diameter-reduced part of FIG. It is a side view of the solid fuel supply pipe concerning a 2nd embodiment. It is a schematic diagram which shows the case where the connection position of the fixing | fixed part and rotary part in a solid fuel supply pipe is changed, Comprising: (a) shows the case where the length of a fixing part is made longer than the length of a rotating part, (b Shows the case where the length of the rotating part is longer than the length of the fixed part. It is a graph which shows the relationship between the ratio of the length of the fixing | fixed part and the rotation part with respect to the length of the whole solid fuel supply pipe, and various evaluation results.

Hereinafter, an embodiment of a solid fuel supply pipe, a pulverizing apparatus, and a solid fuel supply method will be described with reference to the drawings.
First Embodiment
Hereinafter, a first embodiment will be described using FIGS. 1 to 4.
The boiler installation 1 provided with the crusher concerning this embodiment is shown by FIG. In the present embodiment, the upper side indicates the vertically upper side, and the lower side indicates the vertically lower side.

As shown in FIG. 1, the boiler installation 1 includes a boiler body 3 and a pulverizer 2 for supplying pulverized fuel which is solid fuel pulverized to the burner 9 of the boiler body 3. The pulverizing apparatus 2 is provided with a pulverizer 5 for pulverizing carbon-containing solid fuel such as coal fuel or biomass fuel supplied to the boiler main body 3 into pulverized powder fuel.
The crusher 5 may be of a type that crush only coal, may be a type of crush only biomass fuel, or may be a type of crush biomass fuel with coal. Here, biomass fuel is an organic resource derived from renewable organisms, and for example, thinned wood, waste wood, driftwood, grasses, waste, sludge, tires, and recycled fuels (pellets or the like) Chips, etc., and is not limited to those presented here. Since the biomass fuel is carbon neutral which does not emit carbon dioxide, which is a global warming gas, because it takes in carbon dioxide in the process of growing biomass, its use has been variously studied.

A plurality of pulverized fuel supply pipes 7 are connected to the upper portion of the pulverizer 5, and the pulverized fuel pulverized by the pulverizer 5 becomes a carrier gas, for example, with the hot air via the plurality of pulverized fuel supply pipes 7 It is guided to the burner 9 provided in.
The solid fuel stored in the solid fuel silo (not shown) is led to the pulverizer 5 from the solid fuel supply pipe 20 via the bunker 13.

  A flame is formed by the burner 9 in the furnace in the boiler body 3 and steam is generated by a heat exchanger (not shown) in the boiler body 3. The generated steam is led to a steam turbine (not shown) to rotationally drive the steam turbine, and a generator (not shown) connected thereto is rotated to perform power generation.

FIG. 2 shows a solid fuel supply pipe 20 provided between the crusher 5 and the bunker 13 shown in FIG.
In the present embodiment, the crusher 5 is a pressurized-type vertical mill, and crushes solids such as coal fuel and biomass fuel. Although the details of the crusher 5 are not shown, the crusher 5 is provided with a crush table (not shown) rotating about a central axis extending in the vertical direction, and crushers provided opposite to the upper surface of the crush table And a roller (not shown). Coal fuel and biomass fuel (pellets) are crushed between the grinding table and the grinding roller. The pulverized fuel is rolled up by, for example, hot air as a carrier gas supplied from a hot air supply pipe (not shown), and it is desired to pass through a rotary separator (not shown) provided in the upper space of the crusher 5. After being classified in the size of the fine powder, it is led to the burner 9 of the boiler main body 3 through the fine powder fuel supply pipe 7 (see FIG. 1).

  The upper center of the pulverizer 5 is connected to the lower side of a rotary supply pipe (rotary portion) 21 of the solid fuel supply pipe 20. A fixed supply pipe (fixed part) 22 is connected above the rotary supply pipe 21. A fuel feeder 15 is connected above the fixed supply pipe 22. Details of the solid fuel supply pipe 20 will be described later.

  In the case of coal fuel, the fuel feeder 15 is referred to as a coal feeder, and delivers fuel at a predetermined supply amount. The fuel feeder 15 is of a belt conveyor type in which solid fuel is conveyed by a belt conveyor 16 provided in the inside in the present embodiment. A seal air supply pipe (not shown) supplied by seal air is connected to the inside of the fuel supply machine 15, and the seal air is supplied into the fuel supply machine 15 to make the internal pressure of the fuel supply machine 15 equal to the internal pressure of the crusher 5. Alternatively, the backflow of the carrier gas containing the pulverized fuel in the pulverizer 5 may be prevented.

A bunker 13 is connected to the upper side of the fuel feeder 15 via a down spout 17. When using a biomass fuel, the bunker 13 stores a beret-like biomass fuel, and when using a coal fuel, a coal fuel is stored. The down spout 17 is a steel pipe portion extending in the vertical direction, and fuel is held in a stacked state inside. In the case of coal fuel, the coal fuel stacked in the downspout 17 ensures sealability so that the carrier gas containing pulverized fuel on the crusher 5 side does not flow back to the bunker 13 side.
On the other hand, as described later, when pelletized biomass fuel is used as the raw material, the sealability of the packed bed in the downspout 17 is coal fuel because the particle diameter of biomass fuel is larger than that of coal fuel, etc. In this case, blow-by of the carrier gas containing pulverized fuel from the grinder 5 to the bunker 13 may occur, and the sealing performance may be inferior. For this reason, the rotary valve 50 may be provided on the fixed supply pipe 22 (a configuration in which the rotary valve 50 is provided will be described in the second embodiment).

  The solid fuel supply pipe 20 is referred to as a coal feed pipe in the case of coal fuel, and as shown in FIGS. 2 and 3, the solid fuel supplied from the fuel supply machine 15 has its inside from the top to the bottom. By circulating, the solid fuel is supplied from the fuel feeder 15 to the pulverizer 5 (see arrow A1 in FIG. 2 and arrow A2 in FIG. 3). The solid fuel supply pipe 20 has a configuration in which a fixed supply pipe 22 constituting the upstream side of the solid fuel supply pipe 20 and a rotary supply pipe 21 constituting the downstream side are connected, and extends in the vertical direction It is a tubular member. In other words, the solid fuel supply pipe 20 is divided into the fixed supply pipe 22 and the rotary supply pipe 21. A rotary shaft of the rotary supply pipe 21 is provided such that the solid fuel supply pipe 20 is along the upper and lower axial directions of the fixed supply pipe 22. In addition, when the fixed supply pipe 22 and the rotary supply pipe 21 are connected in such a way that the vertical axes thereof are both the central axis C (see the alternate long and short dashed line in FIG. 3) and coincide with each other. Supply is smoother and more preferable.

  The fixed supply pipe 22 is a tubular member extending downward from the lower surface portion of the fuel feeder 15 for discharging solid fuel by a predetermined length. That is, the upstream side of the solid fuel supply pipe 20 is configured. The pipe diameter of the fixed supply pipe 22 is, for example, a large pipe diameter of 500 A to 800 A (nominal diameter). In addition, the inner diameter of the fixed supply pipe 22 is set such that solid fuel adhering to the inner peripheral surface of the fixed supply pipe 22 does not drop and close due to its own weight before the fixed supply pipe 22 is closed. It is set to. An upper end portion of a scraper 29 which will be described later is fixed to the inner peripheral surface on the lower end side of the fixed supply pipe 22 (see also FIG. 4).

  The rotary supply pipe 21 constitutes the downstream side of the solid fuel supply pipe 20. For example, as shown in FIG. 3, the rotary supply pipe 21 has a large diameter portion 24 connected to the lower end side of the fixed supply pipe 22 and a pipe diameter that decreases in the downward direction from the lower end of the large diameter portion 24. And a small diameter portion 26 extending downward from the lower end of the reduced diameter portion 25 integrally. The large diameter portion 24, the reduced diameter portion 25, and the small diameter portion 26 are formed such that the vertical axes thereof are all coincident with the central axis C. As described later, the rotary supply pipe 21 can be rotated counterclockwise (see arrow A3) in plan view centering on the central axis C by the driving force from the driving device 27 provided in the small diameter portion 26. , Is supported by a base plate 46 described later. Further, a scraper 29 is accommodated inside the rotary supply pipe 21.

The large diameter portion 24 is formed such that the inner diameter is slightly larger than the outer diameter of the lower end portion of the fixed supply pipe 22, and the lower end portion of the fixed supply pipe 22 is inserted therein. That is, the lower end portion of the fixed supply pipe 22 and the large diameter portion 24 are disposed so as to overlap, and form an overlapping region 60. The inner peripheral surface of the large diameter portion 24 and the outer peripheral surface of the lower end portion of the fixed supply pipe 22 are separated, and between the inner peripheral surface of the large diameter portion 24 and the outer peripheral surface of the lower end portion of the fixed supply pipe 22 A gap G1 is formed. Thus, by forming the gap G1, when the rotary supply pipe 21 rotates, the stationary supply pipe 22 and the rotary supply pipe 21 are prevented from interfering with each other and sliding.
The gap G1 is formed to extend vertically in the overlapping region 60, the lower end of the gap G1 communicates with the inside of the solid fuel supply pipe 20, and the upper end of the gap G1 is outside the solid fuel supply pipe 20. It is in communication.

  The reduced diameter portion 25 is a substantially frusto-conical tubular member whose upper end is connected to the lower end of the large diameter portion 24 and whose lower end is connected to the upper end of the small diameter portion 26. A wear resistant material (wear resistant portion) 28 is provided on the inner peripheral surface of the lower portion of the reduced diameter portion 25 (see FIG. 4). Examples of the wear resistant material 28 include liners such as ceramics and high chromium castings, and hardfacing welding. Further, the inclination angle (the angle with respect to the horizontal plane) of the inner peripheral surface of the reduced diameter portion 25 is equal to or more than the repose angle (for example, 45 degrees) of the solid fuel. By setting the inclination angle of the reduced diameter portion 25 to be equal to or more than the repose angle in this way, it is possible to prevent the solid fuel passing through the reduced diameter portion 25 from being deposited. The inclination angle of the reduced diameter portion 25 may be set to be an angle (for example, 65 degrees) which is steeper than the repose angle. By doing this, it is possible to more reliably prevent the solid fuel from being deposited on the reduced diameter portion 25.

  The small diameter portion 26 is a tubular member having a tube diameter and an inner diameter smaller than those of the large diameter portion 24 and extends in the vertical direction. The tube diameter of the small diameter portion 26 is, for example, 300A to 400A (nominal diameter), which is smaller than the tube diameter of the fixed supply tube 22. In addition, since the inner diameter of the small diameter portion 26 has a size that may block the small diameter portion 26 before the solid fuel adhering to the inner circumferential surface of the small diameter portion 26 falls by its own weight, the scraper 29 is provided There is.

  The scraper 29 is disposed along the inner peripheral surface of the rotary supply pipe 21 over substantially the entire area of the rotary supply pipe 21 in the vertical direction. Further, the scraper 29 is a plate-like or rod-like member which is bent along the large diameter portion 24, the reduced diameter portion 25 and the small diameter portion 26 and extends in the vertical direction. In addition, since the scraper 29 is being fixed to the fixed type supply pipe 22 as mentioned above, it does not rotationally move. When the rotary supply pipe 21 rotates, the solid fuel attached to the inner circumferential surface of the rotary supply pipe 21 and the scraper 29 contact with each other so that the attached fixed fuel is scraped off.

  The drive device 27 includes a motor 42 having a drive shaft 41, a small sprocket 43 connected to the drive shaft 41 of the motor 42, a large sprocket 44 fixed to the outer peripheral surface of the small diameter portion 26, and a small sprocket 43 A chain 45 connecting with the sprocket 44 and a gear box 40 are provided. The large sprocket 44 is rotationally driven by the driving force of the motor 42 transmitted through the chain 45 and the small sprocket 43. The large sprocket 44 is rotationally driven to rotate the rotary supply pipe 21 to which the large sprocket 44 is fixed. The rotational speed of the rotary supply pipe 21 is, for example, 1.0 rpm to 3.0 rpm. The chain 45 and the large sprocket 44 may be covered by a cover (not shown). By covering the chain 45 and the large sprocket 44 with the cover, the chain 45 and the large sprocket 44 can be prevented from being exposed and contact with surrounding structures and workers can be prevented, thereby improving safety.

  Further, a base plate 46 is provided below the drive device 27 so as to surround the rotary supply pipe 21. The base plate 46 is supported at its lower surface by a plurality of supports 47 from below from a beam member not shown. Further, deep groove ball bearings 48 are provided between the base plate 46 and the large sprockets 44. The deep groove ball bearing 48 rotatably supports the rotary supply pipe 21 while supporting both the thrust load and the radial load of the rotary supply pipe 21.

  A seal structure 30 may be provided at a connection portion in the overlapping area 60 where the fixed supply pipe 22 and the rotary supply pipe 21 are connected. The seal structure 30 is provided adjacent to the lower side of the second seal box 32 and the second seal box 32 provided adjacent to the lower side of the first seal box 31 with which the gap G1 communicates. And a third seal box 33. In addition, the seal structure 30 is supported by the fixed supply pipe 22.

  The first seal box 31 has an annular space S1 inside, and is an annular ring extending substantially horizontally outward from the entire circumferential direction of the outer peripheral surface of the fixed supply tube 22 above the upper end of the gap G1. An upper plate 31a, a cylindrical side plate 31b extending downward from the outer peripheral end of the upper plate 31a, and a lower plate 31c extending substantially horizontally inward in the radial direction from the lower end of the side plate 31b. The height position of the lower plate 31c in the vertical direction is substantially the same height position as the upper end portion of the gap G1 (that is, the upper end of the large diameter portion 24). The inner peripheral end of the lower plate 31c and the outer peripheral surface of the large diameter portion 24 are separated, and a gap G2 is formed between the inner peripheral end of the lower plate 31c and the outer peripheral surface of the large diameter portion 24. . On the lower surface of the inner peripheral end of the lower plate 31c, an annular gasket 34 is provided which protrudes further in the outer peripheral surface direction of the large diameter portion 24 from the inner peripheral end. The gasket 34 is formed of an elastic material, and the inner peripheral end thereof is slightly separated from the outer peripheral surface of the large diameter portion 24, but the separated distance is set as short as possible. Further, the inner peripheral end of the gasket 34 may be in contact with the outer peripheral surface of the large diameter portion 24 to such an extent that no load is generated.

  The second seal box 32 has an annular space S2 inside. The space S2 communicates with the space S1 via the gap G2. Seal air (seal gas) is supplied into the space S2 from a seal air supply device (not shown) (see arrow A4 in FIG. 3). The space S2 is formed by the annular upper plate 32a and the lower plate 32c, and the side plate 32b connecting the outer peripheral end portions of the upper plate 32a and the lower plate 32c. The second seal box 32 is supported by the first seal box 31 by fixing the upper plate 32 a to the first seal box 31. In addition, the second seal box 32 supports the third seal box 33 by fixing the lower plate 32 c to the side plate 33 b of the third seal box 33 described later.

  The third seal box 33 has an annular space S3 therein, an annular upper plate 33a defining the upper side of the space S3, and a cylindrical side plate 33b extending downward from the outer peripheral end of the upper plate 33a; And an annular lower plate 33c extending radially inward from the lower end of the side plate 33b. The inner peripheral end of the upper plate 33a is arranged to be separated from the outer peripheral surface of the rotary supply pipe 21, and a gap G3 is formed between the inner peripheral end of the upper plate 33a and the outer peripheral surface of the rotary supply pipe 21. It is formed. The gap G3 communicates the space S2 with the space S3. Further, the inner peripheral end of the lower plate 33 c is arranged to be separated from the outer peripheral surface of the rotary supply pipe 21, and a gap is formed between the inner peripheral end of the lower plate 33 c and the outer peripheral surface of the rotary supply pipe 21. It forms G4. The gap G4 communicates the space S3 with the space outside the seal structure 30. Inside the space S3, a mechanical seal 35 is provided that prevents the seal air flowing into the space S3 via G3 from flowing out to the space outside the seal structure 30 via G4. The mechanical seal 35 is formed of an elastic material.

  Thus, by providing the gap G2, the gap G3 and the gap G4, when the rotary supply pipe 21 rotates, the seal structure 30 and the rotary supply pipe 21 are prevented from interfering with each other and sliding. There is.

According to the present embodiment, the following effects are achieved.
In the present embodiment, the solid fuel supply pipe 20 has a fixed supply pipe 22 and a rotary supply pipe 21 having a smaller diameter than the fixed supply pipe 22.
Thereby, the solid fuel supply pipe 20 can be miniaturized as compared with a structure in which the entire solid fuel supply pipe 20 is configured by the fixed supply pipe 22. Therefore, the space occupied by the solid fuel supply pipe 20 can be reduced, and the layout in the vicinity of the solid fuel supply pipe 20 can be improved. Further, as compared with the structure in which the solid fuel supply pipe 20 is entirely configured by the fixed supply pipe 22, the overall weight of the solid fuel supply pipe 20 can be reduced. Thereby, the installation work of the solid fuel supply pipe 20 can be facilitated.
Further, as compared with the structure in which the solid fuel supply pipe 20 is entirely configured by the rotary supply pipe 21, the length of the rotary supply pipe 21 is shortened. Thereby, the driving force at the time of rotating the rotary supply pipe 21 can be reduced. In addition, when installing the rotary supply pipe 21, the rotation is performed so that the scraper 29 is along the inner circumferential surface of the rotary supply pipe 21 in order to prevent distortion in the rotation path during rotation. In order to set the relative position between the formula supply pipe 21 and the scraper 29 to a predetermined position, it is necessary to carry out a centering operation when installing the rotary supply pipe 21. In such a centering operation, the precision is determined as the length of the rotary supply pipe 21 is longer, but in the above configuration, the length of the rotary supply pipe 21 is shorter, so The centering operation can be easily performed. Thereby, compared with the structure which comprises the whole solid fuel supply pipe 20 by the rotary supply pipe 21, the installation operation of the solid fuel supply pipe 20 can be facilitated.

  Further, a part of the solid fuel flowing through the inside of the fixed supply pipe 22 (in particular, the solid fuel flowing near the inner peripheral surface of the fixed supply pipe 22) collides with the inner peripheral surface of the reduced diameter portion 25. In the present embodiment, the wear resistant material 28 is provided on the inner peripheral surface of the reduced diameter portion 25. Thereby, the wear of the inner peripheral surface of the reduced diameter portion 25 due to the collision of the solid fuel can be suppressed.

In the overlapping area 60 on the downstream end side of the fixed supply pipe 22 and the upstream end side of the rotary supply pipe 21, the outer peripheral surface of the fixed supply pipe 22 and the inner periphery of the large diameter portion 24 of the rotary supply pipe 21 A gap G1 is formed between the surface and the surface. Therefore, when the rotary supply pipe 21 rotates, interference can be prevented between the stationary supply pipe 22 and the rotary supply pipe 21 for connection.
Further, the gap G <b> 1 extends in the vertical direction, which is the extending direction of the solid fuel supply pipe 20. As a result, the solid fuel is stored in the banker 13 on the upstream side of the solid fuel supply pipe 20, whereby the downward load acting on the fixed supply pipe 22 is increased, and the fixed supply pipe 22 is moved downward. Even in the case of movement, the gap G1 does not close. Therefore, even in such a case, interference between the stationary supply pipe 22 and the rotary supply pipe 21 can be prevented. The gaps G2, G3 and G4 formed between the seal structure 30 fixed to the fixed supply tube 22 and the rotary supply tube 21 are also gaps which communicate in the vertical direction, so the gap G1 Similarly to the above, even if the fixed supply pipe 22 is moved downward, it does not close. Accordingly, interference between the seal structure 30 and the rotary supply pipe 21 can also be prevented.

  Further, the lower end of the gap G1 communicates with the inside of the solid fuel supply pipe 20, and the upper end communicates with the outside of the solid fuel supply pipe 20. That is, when viewed from the end (the lower end in the present embodiment) communicating with the inside of the solid fuel supply pipe 20 in the gap G1, the gap G1 corresponds to the flowing direction of the solid fuel (the direction from the upper to the lower in this embodiment) It will extend in the opposite direction. As a result, it is possible to make it difficult for the solid fuel to flow into the gap G1, and to make it difficult for the solid fuel to flow through the gap G1. Therefore, it is possible to suppress the solid fuel from flowing out of the solid fuel supply pipe 20 through the gap G1. In this embodiment, since the gap G1 extends upward as viewed from the end of the gap G1 communicating with the inside of the solid fuel supply pipe 20, the solid fuel further flows into the gap G1 by the action of gravity. While being able to make it hard, it can be made hard for solid fuel to distribute through the inside of crevice G1.

Further, by providing the gap G1, there is a possibility that the air inside the solid fuel supply pipe 20 and the reverse flow carrier gas may flow out through the gap G1 (see the broken line arrow A5 in FIG. 3). The seal structure 30 is applied to G1. The seal structure 30 is provided with a gasket 34 in the gap G2 formed in the first seal box 31 with which the gap G1 communicates, so that the air inside the solid fuel supply pipe 20 and the carrier gas flowing back flow out of the seal structure 30. It is preventing it from leaking out. In addition, the seal air is supplied to the inside of the second seal box 32 in which the gap G2 communicates, so that the air and the backflowed carrier gas may leak from the slight gap formed between the gasket 34 and the large diameter portion 24. It is preventing. By applying the seal structure 30 in this manner, the outflow of air inside the solid fuel supply pipe 20 and the carrier gas flowing back is prevented, and the outflow of solid fuel from the solid fuel supply pipe 20 is also reliably prevented. Can.
Further, by providing a mechanical seal 35 in the third seal box in the gaps G3 and G4 communicating the second seal box 32 with the outside, the seal air flows out to the outside (see the broken arrow A6 in FIG. 4). To prevent. By preventing the seal air from flowing out, it is possible to prevent the generation of a whistle noise.

  Further, by setting the fixed type supply pipe 22 relatively short, the distance from the fuel supply device 15 to the diameter reducing portion 25 can be shortened. As a result, it is possible to reduce the collision energy when the solid fuel falling from the fuel feeder 15 into the solid fuel supply pipe 20 collides with the reduced diameter portion 25. Therefore, wear and damage of the reduced diameter portion 25 can be reduced.

Second Embodiment
Subsequently, a second embodiment will be described with reference to FIG. The boiler installation 1 which concerns on this embodiment differs from 1st Embodiment by the point by which the rotary valve | bulb 50 is provided in the fixed type supply pipe 22. The same configuration as that of the first embodiment is denoted by the same reference numeral, and the description thereof is omitted.

The pulverizer 5 which concerns on this embodiment becomes a form which grinds only biomass fuel. In the case of using a large size material with a small specific gravity such as biomass fuel as the raw material to be crushed by the crusher 5, the space in which the raw material passes through the gas is blocked and the sealing effect with the bunker 13 by its own weight can not be expected. Air and backflow of the carrier gas to the bunker 13 may occur.
This is because, since the biomass fuel is in the form of pellets, the gap between the biomass fuel is large, and the blow-up sealability that blocks the passage of the backflowed carrier gas inside the bunker 13 is inferior to that of coal.
Usually, when coal is crushed by the crusher 5, the internal pressure of the fuel supply device 15 is set to a value larger than the internal pressure of the crusher 5 by supplying seal air to the fuel supply device 15 or the like. This is intended to prevent the hot gas in the pulverizer 5 from flowing into the fuel feeder 15. In order to increase the internal pressure of the fuel feeder 15, the sealability of the coal packed bed formed in the downspout 17 connecting the bunker 13 and the fuel feeder 15 causes the fuel feeder 15 to flow from the inside to the banker 13 side. Is prevented from occurring.
On the other hand, when pelletized biomass fuel is used as the raw material, the sealability in the packed bed in the downspout 17 is inferior to that of coal fuel because the particle diameter of biomass fuel is larger than that of coal fuel, etc. . For this reason, the sealability of the biomass packed bed formed on the downspout 17 is insufficient, and blowout of the carrier gas containing the pulverized fuel from the grinder 5 to the bunker 13 may occur.

  In the present embodiment, the fixed supply pipe 22 is provided with a rotary valve 50. Although the installation position of the rotary valve 50 can be installed at any position of the fixed type supply pipe 22, a fixed type supply pipe having a length of 100 mm or more between the fuel supply device 15 and the lifting type at the time of maintenance It is desirable to provide 22 or an alternative fitting. The rotary valve 50 includes a rotating portion provided in the valve housing and provided with a plurality of rotationally partitioned chambers. Since the respective chambers formed in the rotary unit are independent, even in the case of supplying biomass fuel, it is possible to seal the flow of air from the rotary supply pipe 21 upward.

The following effects are achieved in the present embodiment.
In the present embodiment, a rotary valve 50 is provided. Thereby, the carrier gas containing the pulverized fuel which has flowed into the solid fuel supply pipe 20 from the inside of the pulverizer 5 is blocked by the rotary valve 50. Therefore, the carrier gas containing the pulverized fuel in the pulverizer 5 flows back through the inside of the solid fuel supply pipe 20 (that is, it circulates in the direction opposite to the flow direction of the solid fuel), and upstream of the solid fuel supply pipe 20 It is possible to prevent blowout to the side.
In addition, when the rotary valve 50 is provided in the rotary supply pipe 21, the installation is difficult because there is a drive portion of the rotary valve 50. That is, it is necessary to fix the rotary valve 50 while preventing the rotary valve 50 from rotating with the rotary supply pipe 21. For this reason, in the case where the rotary valve 50 is provided in the rotary supply pipe 21, a seal structure has to be provided on the upstream side and the downstream side of the rotary valve 50, and the structure becomes complicated. In the present embodiment, since the rotary valve 50 is provided in the fixed supply pipe 22, it is not necessary to provide such a complicated structure. Thus, the solid fuel supply pipe 20 having the rotary supply pipe 21 and provided with the rotary valve 50 can be realized with a simple structure. Therefore, it is possible to prevent blowout of the carrier gas containing the pulverized fuel from the pulverizer 5 to the bunker 13 with a simple configuration while reducing the occupied space and realizing the weight reduction.
In particular, due to the relationship of space, etc., it is not possible to connect a large diameter pipe such as the fixed type supply pipe 22 and in a small size crusher which must adopt a small diameter rotary type supply pipe, biomass fuel When grinding the solid fuel supply pipe 20 according to this embodiment, blowout of the carrier gas containing the pulverized fuel from the grinder 5 to the bunker 13 can be prevented with a simple configuration, which is effective. It is. The small crusher here means that even if solid fuel supply pipes that can be connected have the largest internal diameter, the solid fuel adhering to the inner peripheral surface of the pipe blocks the pipe before it falls by its own weight. It is a crusher that may

  In the above configuration, by providing the rotary valve 50 as a part of the fixed supply pipe 22, the length of the fixed supply pipe 22 is increased. Further, when the length of the rotary supply pipe 21 is increased and the fixed supply pipe 22 is shortened, the installation position of the rotary valve 50 is increased and the maintainability is reduced. For this reason, in view of the maintainability of the rotary valve 50, it is preferable that the length of the fixed supply pipe 22 be longer. Therefore, the length of the fixed supply pipe 22 is made longer than the length of the rotary supply pipe 21, and the ratio of the length of the fixed supply pipe 22 to the whole solid fuel supply pipe 20 is 50% to 75%. Then, it is more preferable. Moreover, the fact that the length of the fixed supply pipe 22 is longer than the length of the rotary supply pipe 21 means, in other words, the length of the rotary supply pipe 21 is shorter than the length of the fixed supply pipe 22 . If the length of the rotary supply pipe 21 is shorter than the length of the fixed supply pipe 22, the power required for the rotation of the rotary supply pipe 21 can be reduced.

  In addition, when installing the rotary supply pipe 21, the rotation is performed so that the scraper 29 is along the inner circumferential surface of the rotary supply pipe 21 in order to prevent distortion in the rotation path during rotation. In order to set the relative position between the formula supply pipe 21 and the scraper 29 to a predetermined position, it is necessary to carry out a centering operation when installing the rotary supply pipe 21. In such an alignment operation, the precision is determined as the length of the rotary supply pipe 21 is longer. However, in the present embodiment, since the length of the rotary supply pipe 21 is shorter, the rotary supply pipe 21 is required. Centering work can be easily performed. Thereby, the installation work of the solid fuel supply pipe 20 can be facilitated.

  Further, by providing the rotary valve 50, when the length of the fixed supply pipe 22 is set longer than the length of the rotary supply pipe 21, the rotary valve 50 is set by setting the fixed supply pipe 22 relatively long. Depending on the installation possible position of either of the distance from the fuel feeder 15 to the rotary valve 50 or the distance from the rotary valve 50 to the reduced diameter portion 25 can be shortened. By shortening the distance from the fuel feeder 15 to the rotary valve 50, it is possible to reduce the collision energy when solid fuel falling from the fuel feeder 15 in the solid fuel feed pipe 20 collides with the rotary valve 50. . Therefore, wear and damage of the rotary valve 50 can be reduced. Further, by shortening the distance from the rotary valve 50 to the reduced diameter portion 25, it is possible to reduce the wear and damage of the reduced diameter portion 25 due to the collision of solid fuel.

Next, the ratio between the fixed supply pipe 22 and the rotary supply pipe 21 in the present disclosure will be described using FIGS. 6 and 7. In the above embodiments, the fixed supply pipe 22 and the rotary supply pipe 21 are connected in the case where the length of the fixed supply pipe 22 is shorter than the length of the rotary supply pipe 21 and in the case where it is longer. However, the ratio of the lengths of the fixed supply pipe 22 and the rotary supply pipe 21 may be a ratio that has been optimized from another viewpoint.
It is preferable to select the ratio between the fixed supply pipe 22 and the rotary supply pipe 21 in accordance with the operating conditions of each crushing apparatus 2.

For example, as shown in FIG. 6A, when the connection position is set on the crusher 5 side and the length of the rotary supply pipe 21 is shortened, the power required for the rotation of the rotary supply pipe 21 Can be reduced. Further, since the length of the rotary supply pipe 21 is shortened, the centering operation of the rotary supply pipe 21 can be easily performed. Thereby, the installation work of the solid fuel supply pipe 20 can be facilitated.
Further, for example, as shown in FIG. 6B, when the position to be connected is set to the fuel feeder 15 side and the rotary supply pipe 21 is elongated, the length of the fixed supply pipe 22 having a large diameter is set. The solid fuel supply pipe 20 can be miniaturized because the Thus, the space occupied by the solid fuel supply pipe 20 can be reduced, and the layout in the vicinity of the solid fuel supply pipe 20 can be improved. In addition, the weight of the entire solid fuel supply pipe 20 can be reduced. Thereby, the installation work of the solid fuel supply pipe 20 can be facilitated.
In addition, FIG. 6 is a schematic diagram explaining the connection position (position shown by the dashed-two dotted line in the figure) of the fixed type supply pipe 22 and the rotary type supply pipe 21, and the fixed type supply pipe 22 and the rotation. The pipe diameter of the formula supply pipe 21 is not accurately shown.

The relationship between the ratio of the lengths of the fixed supply pipe 22 and the rotary supply pipe 21 to the entire length of the solid fuel supply pipe 20 and various evaluation results will be described with reference to FIG.
The horizontal axis of the graph shown in FIG. 7 represents the ratio of the lengths of the fixed supply pipe 22 and the rotary supply pipe 21 to the entire length of the solid fuel supply pipe 20, and the left end (fixed supply pipe 100%) is fixed. The right end (the rotary feed pipe 100%) shows the case where the solid fuel feed pipe 20 is composed only of the rotary feed pipe 21 when the solid fuel feed pipe 20 is composed of only the formula feed pipe 22. Also, the vertical axis of the graph shown in FIG. 6 represents the evaluation results for various items, showing that the higher the vertical axis is, the better the result, while the lower side of the vertical axis does not necessarily mean that It is not considered to be bad but shows a relative comparison. Below, various evaluations are demonstrated.

The supply capacity (i.e., the amount of solid fuel supplied from the fuel feeder 15 to the crusher 5) is the ratio of the length of the fixed feed pipe 22 and the rotary feed pipe 21 to the entire length of the solid fuel feed pipe 20. It does not depend on it and assumes it to be constant.
The wear resistance of the reduced diameter portion 25 is evaluated higher as the length ratio of the rotary supply pipe 21 is higher. That is, it becomes difficult to wear. This is because the longer the fixed supply pipe 22 is, the longer the falling distance from the fuel feeder 15 to the reduced diameter portion 25 of the solid fuel introduced into the solid fuel supply pipe 20 is and the collision speed is increased. This is because the collision speed of the solid fuel decreases and the diameter reducing portion 25 becomes more difficult to wear as the fixed supply pipe 22 becomes shorter, as the diameter portion 25 becomes easy to wear. Moreover, evaluation becomes high rapidly from the vicinity in which the ratio of the length of the rotary supply pipe 21 exceeded 50%. This is due to the fact that the solid fuel accelerates further because the falling distance to the reduced diameter portion 25 becomes longer.

The space saving property (in other words, the reduction of the space occupied by the solid fuel supply pipe 20) is evaluated higher as the length ratio of the rotary supply pipe 21 is higher. That is, the occupied space is reduced. This is because the tube diameter of the rotary feed tube 21 is smaller than the tube diameter of the fixed feed tube 22.
The power saving property is evaluated to be lower as the length ratio of the rotary supply pipe 21 is higher. That is, the driving power is increased. This is because the weight of the rotary supply pipe 21 increases as the length of the rotary supply pipe 21 increases.
The lower the installation adjustment cost (in other words, the installation cost of the solid fuel supply pipe 20), the lower the evaluation as the length ratio of the rotary supply pipe 21 becomes higher. This is because, as the length of the rotary supply pipe 21 becomes longer, the centering operation of the rotary supply pipe 21 becomes complicated and the adjustment cost increases.

The lightness of the overall weight of the solid fuel supply pipe 20 is evaluated higher as the length ratio of the rotary supply pipe 21 is higher. That is, it is lightweight. This is because the tube diameter of the rotary feed tube 21 is smaller than the tube diameter of the fixed feed tube 22 and the weight per unit length of the rotary feed tube 21 is lighter. As an example of the mass per unit length of each supply pipe, the mass per unit length of the fixed supply pipe 22 is about 1.5 times to 2 times that of the rotary supply pipe 21.
Further, the cheapness of the installation adjustment cost and the lightness of the overall weight of the solid fuel supply pipe 20 are inversely related to the length ratio of the rotary supply pipe 21. For this reason, in the actual installation workability, when the length ratio of the rotary supply pipe 21 is increased, the evaluation of the installation performance in the middle is increased, but it is reduced thereafter. This is because if the length of the rotary supply pipe 21 is too long, the solid fuel supply pipe 20 is lightened to improve the workability and the evaluation becomes high, but the length of the rotary supply pipe 21 becomes long. If it is too large, the centering operation of the rotary supply pipe 21 becomes complicated and the adjustment cost increases.
The maintainability of the rotary valve 50 (in other words, the ease of maintenance of the rotary valve 50 such as attachment and removal) is obtained when the fixed supply pipe 22 is provided with the rotary valve 50 as in the second embodiment. It is an index. The maintainability of the rotary valve 50 is evaluated lower as the length of the rotary supply pipe 21 is longer. This is because the installation position of the rotary valve 50 becomes higher as the length of the rotary supply pipe 21 becomes longer. The evaluation of the maintainability of the rotary valve 50 indicates that the length of the fixed supply pipe 22 is a predetermined length when the length of the rotary supply pipe 21 is in the middle position. If it becomes smaller than this, the rotary valve 50 can not be provided.

From the above point of view, it is preferable to select the ratio between the fixed supply pipe 22 and the rotary supply pipe 21 in accordance with the specification of the crusher 5, the installation environment and the operating conditions. The ratio of the length of the fixed supply pipe 22 to the length of the solid fuel supply pipe 20 is preferably 20% or more and 75% or less (the range indicated by the arrow in FIG. 7) from the viewpoint of the above various evaluations. is there. In addition, since the wear resistance of the reduced diameter portion 25 is rapidly increased from the vicinity where the ratio of the length of the rotary supply pipe 21 exceeds 50%, the length of the fixed supply pipe 22 is a rotation. It is more preferable that the length be shorter than the formula supply pipe 21. That is, the state in which the ratio of the length of the fixed supply pipe 22 is 20% or more and less than 50% is more preferable.
When the fixed supply pipe 22 is provided with the rotary valve 50, the length of the fixed supply pipe 22 needs to be as short as possible, plus the length to which the rotary valve 50 can be installed.
In addition, since the installation position of the rotary valve 50 is increased and the maintainability is decreased as the length of the rotary supply pipe 21 is increased and the fixed supply pipe 22 is shortened, the ratio of the length of the fixed supply pipe 22 is The state of 50% or more and 75% or less is more preferable.
In addition, the length of the rotary supply pipe 21 needs to be at least the length for attaching the diameter-reduced portion 25 and the drive device 27.

The present disclosure is not limited to the invention according to each of the above-described embodiments, and appropriate modifications can be made without departing from the scope of the invention.
For example, although the wear resistant material 28 is provided only on the inner circumferential surface of the reduced diameter portion 25 in the above embodiments, the wear resistant material may be provided on the inner circumferential surface of the entire solid fuel supply pipe 20.

DESCRIPTION OF SYMBOLS 1 boiler installation 2 crushing apparatus 3 boiler main body 5 crushing machine 7 pulverized fuel supply pipe 9 burner 13 bunker 15 fuel supply machine 16 belt conveyor 17 downspout 20 solid fuel supply pipe 21 rotary type supply pipe (rotation part)
22 Fixed supply pipe (fixed part)
24 large diameter portion 25 reduced diameter portion 26 small diameter portion 27 drive device 28 wear resistant material (wear resistant portion)
29 Scraper 30 Seal structure 31 First seal box 32 Second seal box 33 Third seal box 34 Gasket 35 Mechanical seal 40 Gear box 41 Drive shaft 42 Motor 43 Small sprocket 44 Large sprocket 45 Chain 46 Base plate 47 Support 48 Deep groove ball Bearing 50 Rotary valve A1 to A6 Direction G1 to G4 Clearance S1 to S3 Space

Claims (9)

A solid fuel supply pipe through which solid fuel flows and supplies the solid fuel to a crusher,
A tubular fixing portion constituting an upstream side of the flow direction of the solid fuel;
And a tubular rotating portion that rotates about a central axis along the axial direction of the solid fuel supply pipe;
The upstream side of the rotating portion is connected to the downstream side of the fixed portion, and the downstream side of the rotating portion is connectable to the crusher,
The solid fuel supply pipe having a scraper which is housed inside the rotary part and disposed along the inner peripheral surface of the rotary part, and whose outer diameter is smaller than that of the fixed part. .   The solid fuel supply pipe according to claim 1, wherein a rotary valve is provided in the fixed portion.   The solid fuel supply pipe according to claim 1, wherein a length of the fixed portion is shorter than a length of the rotating portion.   The solid fuel supply pipe according to claim 2, wherein when the rotary valve is provided, a length of the fixed portion is longer than a length of the rotating portion. A reduced diameter portion whose diameter decreases toward the downstream side in the flow direction is formed at the connection portion between the fixed portion and the rotating portion.
The solid fuel supply pipe according to any one of claims 1 to 4, wherein a wear resistant portion is provided on an inner peripheral surface of the reduced diameter portion. At the downstream end of the fixed part, an overlapping area inserted at the upstream end of the rotating part is formed;
The solid according to any one of claims 1 to 5, wherein in the overlapping region, an outer peripheral surface of the downstream end of the fixed portion and an inner peripheral surface of the upstream end of the rotating portion are separated. Fuel supply pipe. A seal structure for sealing a gap formed between the outer peripheral surface of the fixed portion and the inner peripheral surface of the rotating portion in the overlapping region;
The solid fuel supply pipe according to claim 6, wherein a seal gas is supplied to the seal structure. A solid fuel supply pipe according to any one of claims 1 to 7;
And c) a crusher to which the solid fuel is supplied by the solid fuel supply pipe. A solid fuel supply pipe through which solid fuel flows and supplies the solid fuel to a crusher,
A tubular fixing portion constituting an upstream side of the flow direction of the solid fuel;
And a tubular rotating portion that rotates about a central axis along the axial direction of the solid fuel supply pipe;
The upstream side of the rotating portion is connected to the downstream side of the fixed portion, and the downstream side of the rotating portion is connectable to the crusher,
The solid fuel supply pipe having a scraper which is housed inside the rotary part and disposed along the inner peripheral surface of the rotary part, and whose outer diameter is smaller than that of the fixed part. Solid fuel supply method by

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