KR102303897B1 - Fuel supply piping structure, fuel pulverization supply system provided with same, and operating method of fuel supply piping structure - Google Patents

Abstract

Even when switching between biomass fuel and coal fuel, it provides a fuel supply piping structure that can be configured compactly by sharing facilities as much as possible. An upper pipe 49 connected to the fuel supply 50 for supplying the fuel before pulverization in a predetermined supply amount, a lower pipe 45 connected to the pulverizer 5 to guide fuel to the pulverizer 5, and an upper pipe It is provided between (49) and the lower pipe (45), and is provided with the exchange part by which the rotary valve (47) and the single pipe|tube became exchangeable.

Description

Fuel supply piping structure, fuel pulverization supply system provided with same, and operating method of fuel supply piping structure

The present invention relates to a fuel supply piping structure for switching between biomass fuel and coal, a fuel pulverization supply system provided with the same, and a method for operating the fuel supply piping structure.

Solid fuels, such as coal and biomass used in a thermal power plant etc., are grind|pulverized into fine powder form with a grinder, and are supplied to combustion apparatuses, such as a burner. The pulverizer pulverizes solid fuel, such as coal or biomass, fed from a coal feed pipe to a pulverizing table by crushing it between a pulverizing table and pulverizing rollers, and pulverizing it with a carrier gas supplied from the outer periphery of the pulverizing table. The fuel in powder form is divided into small particles by a classifier and conveyed to a combustion device.

BACKGROUND ART Biomass fuel attracts attention as one of measures to reduce carbon dioxide emissions from boilers using fossil fuels. Patent Document 1 discloses that a pulverizer is shared with a biomass fuel and a coal fuel, a biomass fuel and coal are mixed in a fuel supply pipe, and then pulverized together with a pulverizer. Moreover, in patent document 1, the structure which provided the rotary valve in the middle of the fuel supply pipe which supplies biomass fuel is shown.

Japanese Patent Laid-Open No. 2004-347241

Generally, in coal-fired power generation, from the bunker which stores a coal fuel to a coal feeder is connected with a steel pipe, the required amount is measured by the coal feeder, and fuel is injected|thrown-in to a grinder. At this time, in general, when the coal is pulverized with a pressurized pulverizer, the internal pressure of the coal feeder is set to a value greater than the internal pressure of the pulverizer. This is to prevent the pressurized gas from flowing into the coal feeder from the pressure crusher. Moreover, the flow of pressurized gas from the inside of the coal feeder to the bunker side is prevented by the sealing property of the coal-packed layer laminated|stacked on the connecting steel pipe part from a bunker to a coal feeder (henceforth "down spout").

On the other hand, since biomass fuel is in the form of pellets before being pulverized by a pulverizer, the gap between the pellets is larger than that of coal, and the jet sealing property that blocks the passage of gas from the feeder to the inside of the bunker is inferior, in the downspout The sealing property in the filled layer of For this reason, compared with coal, a longer downspout length is required for biomass fuel, and there exists a problem that a facility enlarges.

On the other hand, since the rotary valve is provided in the fuel supply pipe of patent document 1, it has a structure which can seal the pressurized gas from a pressure grinder. However, in patent document 1, a bunker and a coal feeder (fuel feeder) are provided in each of a biomass fuel and a coal fuel, and there exists a problem that the enlargement of an installation cannot be avoided.

The present invention has been made in view of such circumstances, and even when operating by switching between biomass fuel and coal fuel, a fuel supply piping structure that can be configured compactly by sharing facilities as much as possible, and fuel pulverization supply having the same An object of the present invention is to provide a system and a method for operating a fuel supply piping structure.

In order to solve the said subject, the fuel supply piping structure of this invention, the fuel grinding|pulverization supply system provided with this, and the operating method of the fuel supply piping structure employ|adopt the following means.

That is, the fuel supply pipe structure according to one aspect of the present invention includes an upper pipe connected to a fuel supply for supplying fuel before pulverization at a predetermined supply amount, and a lower pipe connected to the pulverizer to guide the fuel to the pulverizer; It is provided between the said upper pipe and the said lower pipe, and provided the replacement part by which the rotary valve and the connection pipe were exchangeable.

The fuel before pulverization is supplied at a predetermined supply amount by a fuel feeder, passes through an upper pipe, is sent to a lower lower pipe, and is guided to a pulverizer. In the pulverizer, the pulverized fuel is obtained by pulverizing the fuel, and the pulverized fuel is supplied to a combustion device such as a burner.

Between the upper pipe and the lower pipe, an exchange part in which the rotary valve and the connecting pipe can be exchanged was provided. Thereby, in the case of using biomass fuel, a rotary valve is provided to seal the ejection of the pressurized gas from the pulverizer with the rotary valve, and the ejection of the pressurized gas to the fuel supply unit and the bunker upstream thereof can be prevented. When coal fuel is used, a connecting pipe is provided instead of a rotary valve. In the case of coal fuel, since it is stored more densely than biomass fuel, the ejection of pressurized gas from the pulverizer can be sealed by a layer of coal at the fuel feeder or upstream of the downspout.

Therefore, even when the fuel supplied to a grinder is changed to either coal fuel or biomass fuel, a common fuel supply machine and grinder can be used.

Further, in the fuel supply piping structure according to an aspect of the present invention, a lower end of the upper pipe is provided with a lower end of the upper pipe that is divided from the main body of the upper pipe and is connected to the exchange unit, and the body of the upper pipe is provided. and a sleeve joint having a cylindrical portion covering the lower end side of the tube and the upper end side of the upper pipe lower end portion, and a fastening fixture for fastening and fixing the cylindrical portion from the outer peripheral side.

In the lower end of the upper pipe, an upper pipe lower end divided from the main body of the upper pipe was provided. And it was decided to provide the sleeve joint which covers the connection part of the upper end side of the lower end side of the upper pipe main body with the upper end side of the upper pipe lower end part, and fastens and fixes the cylindrical part with a fastening fixture. Thereby, when the upper pipe and the exchange part are connected, the upper pipe lower end part is separated, thereby making the exchange part easy to move and the separation is facilitated. In addition, the sleeve joint can absorb the error in the pipe length to facilitate replacement.

Moreover, in the fuel supply piping structure which concerns on one aspect of this invention, the water supply part which supplies water is provided in the vertically downward direction of the said rotary valve.

When a water supply part is provided vertically above a rotary valve, when water is sprayed, there exists a possibility that a biomass fuel may absorb, wet, and clog. Therefore, a water supply part is provided below the rotary valve, and water is supplied toward the lower pipe|tube to make it spray. Thereby, the possibility that the rotary valve may be blocked by biomass fuel is avoided. The water supplied to the grinder and the coal feeder is used, for example, as fire extinguishing water.

Moreover, in the fuel supply piping structure which concerns on one aspect of this invention, the said water supply part is provided in the branch piping which inclines more than the repose angle of biomass fuel with respect to the horizontal direction and ventilates to the said lower piping.

The water supply part was provided in the branch pipe, and the inclination angle with respect to the horizontal direction of the branch pipe was made into the angle of repose or more. Thereby, even if biomass fuel enters into branch piping, it does not remain in branch piping.

Moreover, in the fuel supply piping structure which concerns on one aspect of this invention, the said branch piping is provided with a purge air supply part, and/or a thermometer insertion part, and/or a piercing rod insertion part.

By providing the purge air supply unit in the branch pipe, it is possible to purge the lower pipe and the like and prevent the pressurized gas in the pulverizer from flowing backward through the lower pipe to the fuel supply side. Moreover, by providing the thermometer insertion part in the branch piping, the temperature in lower piping can be measured. In addition, by providing the piercing rod insertion portion in the branch pipe, the clogging of the lower pipe and the like can be eliminated by inserting the piercing rod.

Further, in the fuel supply piping structure according to one aspect of the present invention, a washing water nozzle for supplying and dispersing water in a vertical downward direction and a valve for controlling the supply of water are provided inside the upper pipe.

A washing water nozzle was provided inside the upper pipe, and water was supplied and dispersed vertically downward. Thereby, it becomes unnecessary to provide the scraper which slides piping inner surface, and removes adhering coal, and the work easiness at the time of replacing|exchanging with connection piping can be improved.

Moreover, in the case of biomass fuel, when water is supplied, since there exists a possibility that biomass fuel absorbs and wets and there exists a possibility of clogging the inside of a pipe|tube, the valve which opens and closes so that supply of water may be stopped was provided.

Moreover, in the fuel supply piping structure which concerns on one aspect of this invention, a hopper part is provided in the upper end of the said lower piping, and the wear-resistant material is provided in the inner surface of the hopper part.

A hopper part is provided at the upper end of the lower pipe, and a rotary valve and a connection pipe as an exchange part are attached vertically above this. When a connecting pipe is attached when using coal fuel, the coal supplied from the fuel supply unit collides with the inner surface of the hopper part in an accelerated state by gravity falling under its own weight. Since there is a possibility that the hopper portion may be worn by this collision, a wear-resistant material is provided on the inner surface of the hopper portion to prevent damage to the hopper portion.

Further, a fuel crushing supply system according to an aspect of the present invention includes a bunker that stores fuel, a fuel supply that receives fuel from the bunker and supplies it in a predetermined supply amount, a fuel supply piping structure according to an aspect, and the The grinder provided in the vertical downward direction of the fuel supply piping structure is provided.

In addition, the operating method of the fuel supply pipe structure according to an aspect of the present invention includes an upper pipe connected to a fuel supply for supplying fuel before pulverization at a predetermined supply amount, and a lower pipe connected to the pulverizer to guide the fuel to the pulverizer. A method of operating a fuel supply piping structure provided with a pipe and an exchange part provided between the upper pipe and the lower pipe, in which a rotary valve and a connecting pipe can be exchanged, wherein when biomass fuel is used, instead of the connecting pipe In the case where the rotary valve is provided and coal is used, the connection pipe is provided instead of the rotary valve.

Even in the case of operating by converting biomass fuel and coal fuel, it can be configured compactly by sharing facilities as much as possible.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic block diagram which showed the boiler installation provided with the fuel supply piping structure which concerns on one Embodiment of this invention.
It is a front view which shows the fuel supply piping structure which concerns on one Embodiment.
3 is a front view showing the structure of a fuel supply pipe replaced with a single pipe.
4 is a front view showing the mounting position of the pedestal.
5 is a cross-sectional view taken along line AA of FIG. 3 , and is a cross-sectional view illustrating the washing water nozzle.
Fig. 6 is a front view showing the arrangement of the hopper unit when the rotary valve is installed.
Fig. 7 is a front view showing the arrangement of the hopper unit when a single pipe is installed.
8 is a front view showing the position of the hopper in the case of a comparative example.
9 is a schematic diagram illustrating a process of exchanging a rotary valve and a single pipe.

EMBODIMENT OF THE INVENTION Hereinafter, one Embodiment of this invention is described with reference to drawings.

In FIG. 1, the boiler facility 1 provided with the fuel grinding|pulverization supply system and fuel supply piping structure which concerns on this embodiment is shown. In addition, in this embodiment, the upper direction has shown the vertically upward direction, and the downward direction has shown the vertically downward direction.

The boiler facility 1 is equipped with the grinder 5 which grind|pulverizes the biomass fuel supplied to the boiler main body 3, and coal fuel. Here, biomass fuel is an organic resource derived from a renewable organism, for example, thinning wood, waste wood, driftwood, grass, waste, sludge, tires, and recycled fuels (pellets or chips) using these materials as raw materials, etc. There is no limit to what is presented in Since biomass fuel is considered to be a carbon neutral that does not emit carbon dioxide that becomes a global warming gas from the point of introducing carbon dioxide in the growth process of biomass, its use is variously studied.

A pulverized fuel supply pipe 7 is connected to the pulverizer 5, and the pulverized fuel pulverized by the pulverizer 5 is guided to the burner 9 through the pulverized fuel feed pipe 7 together with hot air serving as a carrier gas. .

In the crusher 5 , the biomass fuel stored in the silo 11 for biomass is guided through the bunker 13 .

A hot air supply pipe 15 is connected to the grinder 5 . The hot air supply pipe 15 is connected to the primary ventilator 17, and the air preheated by the air preheater 19 and the air bypassed by the air preheater 19 are mixed to induce temperature-controlled air. is meant to be In addition, a part of the exhaust gas that has passed through the electric dust collector 23 through the gas recirculation ventilator 21 is guided to the hot air supply pipe 15 . Accordingly, a mixer whose temperature is adjusted by the air preheater 19 and whose oxygen concentration is adjusted by the exhaust gas is guided to the pulverizer 5 through the hot air supply pipe 15 .

A fuel pulverization supply system is comprised by the apparatus from the silo 11 for biomass to the burner 9 mentioned above.

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 guided to a steam turbine (not shown) to generate electricity.

The exhaust gas discharged from the boiler body 3 is denitrified by the denitration device 25 and then the air guided from the primary ventilator 17 is heated with the air preheater 19 and then is guided to the electric dust collector 23 . . After exhaust gas is exhausted by the electrostatic precipitator 23 , the exhaust gas is guided to the desulfurization device 29 through the inducement ventilator 27 . On the upstream side of the inducement ventilator 27 , a portion of exhaust gas is extracted and guided to the hot air supply pipe 15 through the gas recirculation ventilator 21 .

The exhaust gas derived from the induced ventilator 27 is desulfurized in the desulfurization device 29 , and then is guided to the chimney 31 and discharged to the atmosphere.

In FIG. 2, the fuel supply piping structure 40 provided between the grinder 5 and the bunker 13 shown in FIG. 1 is shown.

The pulverizer 5 is a pressurized vertical mill, and pulverizes solids such as coal fuel and biomass fuel. The grinder 5 is provided with the grinding|pulverization table 42 which rotates around the central axis line extending in a vertical direction, and the grinding|pulverization roller 43 provided opposite the upper surface of the grinding|pulverization table 42. As shown in FIG. Coal fuel or biomass fuel (pellets) is pulverized between the pulverization table 42 and the pulverization roller 43 . The pulverized fuel is entrained by the hot air supplied from the hot air supply pipe 15 (see Fig. 1), passes through the rotary separator 44, is classified into fine powder, and then the pulverized fuel supply pipe 7 (Fig. 1). see) and is guided to the burner 9 of the boiler body 3 .

A lower pipe 45 of the fuel supply pipe structure 40 is fixed to the upper center of the grinder 5 . Above the lower pipe 45 , the rotary valve 47 and the upper pipe 49 are connected in this order. A fuel supply 50 is connected above the upper pipe 49 .

The fuel feeder 50 is called a coal feeder in the case of coal fuel, and sends out fuel by the supply amount of a predetermined amount. For example, the fuel feeder 50 is a belt conveyor type. The seal air pipe 50a provided with the valve 50a1 for seal air and the fire water pipe 50b provided with the valve 50b1 for fire water may be connected to the fuel supply 50. The seal air valve 50a1 is opened in the case of coal fuel, and by supplying the seal air into the fuel feeder 50, the internal pressure of the fuel feeder 50 is made higher than the internal pressure of the pulverizer 5, and the pulverizer 5 ), you may make it prevent the backflow of the pressurized gas containing the fine powder in it. The fire extinguishing water valve 50b1 is opened when fire extinguishing is required in the case of coal fuel, and water is sprayed, and it is normally closed. In the case of biomass fuel, the fire extinguishing water valve 50b1 is always closed so that it does not wet by absorption.

A bunker 13 is connected above the fuel supply 50 via a down spout 52 . In the bunker 13, when biomass fuel is used, pellet-form biomass fuel is stored, and when coal fuel is used, coal fuel is stored. The down spout 52 is a steel pipe portion extending in the vertical direction, and fuel is held therein in a stacked state. In the case of coal fuel, the sealing property in which the pressurized gas containing the fine powder on the side of the grinder 5 does not flow back into the bunker 13 side is ensured by the coal fuel laminated|stacked in the down spout 52 side.

When using biomass fuel, there exists a clearance gap between pellet-form biomass fuel, and the sealing property by the fuel layer in the downspout 52 becomes inadequate compared with coal fuel. For this reason, when using biomass fuel, by providing the rotary valve 47 below the upper pipe 49, the pressurized gas containing fine powder on the side of the grinder 5 does not flow back into the bunker 13 side, and a seal does not flow. secure the castle Moreover, when using coal fuel, you may remove the rotary valve 47 in consideration of the abrasion etc. by coal.

Between the lower side of the upper pipe 49 and the rotary valve 47, an upper pipe lower end 56 divided from the main body of the upper pipe 49 is provided. The lower end of the upper pipe lower end 56 is fixed with respect to the rotary valve 47 through a flange. A sleeve joint 54 is provided at a connection portion between the lower side of the main body of the upper pipe 49 and the upper side of the upper pipe lower end 56 . The sleeve joint 54 is separated when the rotary valve 47 and the single pipe (connection pipe) 48 (refer to Fig. 3) are exchanged. The sleeve joint 54 includes a cylindrical portion 54a covering a connection portion between the lower side of the main body of the upper pipe 49 and the upper side of the upper pipe lower end 56, and a fastening band for fastening and fixing the cylindrical portion 54a from the outer periphery side. (fastening fixture; 54b). The cylinder portion 54a is made of, for example, a rubber material having flexibility. The fastening band 54b has a ring shape divided in half, for example. The lower side of the main body of the upper pipe 49 by covering the main body of the upper pipe 49 and the upper pipe lower end 56 in a state to cover the cylindrical part 54a and fastening the cylindrical part 54a with the fastening band 54b. and the upper side of the upper pipe lower end portion 56 is airtightly fixed. A plurality of fastening bands 54b may be provided.

The rotary valve 47 is provided with the rotation part provided in the valve housing and provided with the several chamber partitioned in the rotation direction. Since each chamber formed in the rotating part is independent, even when supplying biomass fuel, the flow of the pressurized gas toward the upper direction from the lower pipe 45 can be sealed.

A seal air pipe 47a is connected to the rotary valve 47 via a seal air valve 47a1. The sliding part between the valve housing and the rotating part is sealed by the seal air supplied from the seal air pipe 47a.

The rotary valve 47 can be replaced with the single pipe 48 shown in FIG. 3 . The short pipe 48 is a straight steel pipe. In the case of using coal fuel, it is replaced with a single pipe (48).

A pedestal 58 made of branch piping is provided below the rotary valve 47 . The pedestal 58 is inclined upward from the flow path (lower pipe 45 in FIG. 2) through which fuel flows. The inclination angle θ with respect to the horizontal direction of the pedestal 58 is set to be equal to or greater than the angle of repose of the biomass fuel and the coal fuel. The pedestal 58 is connected to a fire extinguishing water pipe (water supply unit) 60 provided with a fire extinguishing water valve 60a and a purge air pipe 61 provided with a purge air valve 61a. By opening the purge air valve 61a and allowing the purge air to flow to the lower pipe 45 through the pedestal 58, the pressurized gas in the pulverizer 5 can be prevented from flowing backward toward the bunker 13. have. Moreover, sticking of a biomass fuel or a coal fuel can be suppressed because purge air flows through the inside of the lower pipe 45. As shown in FIG. In the case of biomass fuel, the valve 60a for extinguishing water is opened when fire extinguishing is required, and is normally closed. Since water does not flow to the rotary valve 47 located above even if fire extinguishing water is sprayed, it can prevent that the biomass fuel in the rotary valve 47 absorbs, wets, and clogs. The valve 61a for purge air and the valve 60a for fire water are used similarly in the case of not only biomass fuel but coal fuel. Moreover, also when using biomass fuel, the internal pressure of the fuel supply 50 is made higher than the internal pressure of the grinder 5 by opening the valve 50a1 for seal air and supplying the seal air into the fuel supply 50, and the grinder (5) You may make it prevent the backflow of the pressurized gas containing the fine powder in it. Alternatively, seal air may be supplied from the pedestal 58 made of branch piping.

A ball valve 62 is provided on the pedestal 58 above the connection portion between the fire extinguishing water pipe 60 and the purge air pipe 61 , and a cap 63 is provided at an upper opening end of the ball valve 62 . This is provided. The ball valve 62 is normally closed, and is opened when inserting the piercing rod. The stick is inserted from the open end by removing the cap 63 . The clogging of the lower pipe 45 and the like is eliminated by the piercing rod. Further, the ball valve 62 is opened even when a thermocouple or the like (thermometer) is inserted. Since the pressurized gas in the pulverizer 5 is hot air, a thermocouple or the like is inserted through the pedestal 58 when necessary, such as when checking whether a backflow has occurred to the fuel supply 50 side by temperature. The temperature in the pipe 45 or the like can be measured.

As shown in FIG. 4, you may provide the relay pipe 65 provided with the hopper part 70. As shown in FIG. In this case, the pedestal 58 may be attached to the relay pipe 65 provided below the rotary valve 47 . Thereby, even when the diameter of the lower pipe 45 or the like to be connected is different, the pedestal 58 can be mounted through the relay pipe 65 having the diameter matched. In addition, when using the pedestal 58 only at the time of biomass fuel, it is separable together with the rotary valve 47.

5, the washing water nozzle 67 provided in the upper pipe 49 is shown. FIG. 5 is a cross-sectional view taken along line A-A in FIG. 3 . The washing water nozzle 67 supplies and disperses washing water downward from two substantially semicircular arc-shaped headers 67a arranged along the inner peripheral surface of the upper pipe 49 . Thereby, when it is coal fuel, the coal adhering to the inner surface of the short pipe 48 is washed away. A washing water supply pipe 68 is connected to the washing water nozzle 67 . The supply and stop of the washing water are controlled by the washing water ball valve 69 provided in the washing water supply pipe 68 . The ball valve 69 for washing water is always closed when it is a biomass fuel, and it suppresses that biomass fuel absorbs, wets, and clogs the rotary valve 47 etc.

In this embodiment, the hopper part 70 may be provided on the upstream side of the grinder 5. As shown in FIG. As shown in FIG. 6, the upper end of the lower pipe 45 is provided with a hopper part 70 that expands upward. Also, a belt conveyor 51 provided in the fuel feeder 50 is shown in FIG. 6 . The fuel is sequentially sent downward by this belt conveyor 51 .

An abrasion-resistant material is provided on the inner surface of the hopper part 70 . As a wear-resistant material, ceramics and hardening build-up welding are mentioned, for example.

The reason for providing a wear-resistant material on the inner surface of the hopper part 70 is as follows. When the rotary valve 47 is present as shown in Fig. 6, the fuel does not directly collide with the hopper portion 70, and when the rotary valve 47 is used, the fuel becomes biomass fuel, so the hopper portion 70 There is no risk of damaging the inner side of In contrast, when replacing the rotary valve 47 from the state in which the rotary valve 47 is installed to the state in which the single pipe 48 is installed as shown in FIG. 7 , the single pipe 48 only exists, so it falls from the fuel feeder 50 . One coal is accelerated by gravity and directly collides with the hopper unit 70 . Moreover, since it has a structure on the premise of exchange with the rotary valve 47, it is convenient for the position of the hopper part 70 to be below the rotary valve 47, and in this case, from the fuel feeder 50 to the hopper The distance to the portion 70 is increased. As a comparative example, in the case of exclusive use of coal as in the case of FIG. 8 , since exchange with the rotary valve 47 is not premised, the hopper part 70 ′ provided on the upper end side of the coal supply pipe 40 ′ is the fuel feeder 50 . ) can be placed close to the Therefore, in the case of adopting a structure that can be replaced from the state in which the rotary valve 47 is installed to the state in which the single pipe 48 is installed as shown in FIG. 7 , the fuel supply unit 50 to the hopper part 70 is Since the distance of is increased, the coal accelerated by gravity fall collides with the inner surface of the hopper unit 70 at high speed. Accordingly, providing a wear-resistant material on the inner surface of the hopper portion 70 is effective in reducing damage to the inner surface of the hopper portion 70 .

Next, using FIG. 9, the process of replacing|exchanging the rotary valve 47 shown in FIG. 2 and the short pipe 48 shown in FIG. 3 is demonstrated.

As shown in FIG. 9 , the grinder 5 is installed on the lower floor F1 , and the fuel feeder 50 is installed on the upper floor F2 . Between the lower floor F1 and the upper floor F2, the intermediate floor F3 is provided below the installation position of the rotary valve 47 and at a height position of the connection part near the upper part of the lower pipe 45. have.

Hereinafter, the process of removing the rotary valve 47 and attaching the single pipe 48 is demonstrated.

First, the half-division fastening band 54b fastening the cylindrical portion 54a of the sleeve joint 54 is loosened or separated (refer to reference numeral S1).

Next, the cylinder part 54a of the sleeve joint 54 is slid upward (refer reference numeral S2). Moreover, you may slide the cylindrical part 54a downward.

Next, the upper pipe lower end portion 56 is separated by moving it in the horizontal direction (refer to reference numeral S3). Thereby, a space is formed above the rotary valve 47, and the separation of the rotary valve 47 becomes easy.

Next, using the rope 72 hung down from the upper floor F2, the rotary valve 47 is suspended and moved in a horizontal direction (refer reference numeral S4). For example, the lower end of the rope suspended from the hoist or monorail provided in the upper floor F2 is attached to the eye plate provided in the rotary valve 47, and it hangs down. Moreover, you may move the rotary valve 47 by providing lateral pulling devices, such as a lower rail, a bogie, and a roller, in the intermediate|middle floor F3.

Next, the rotary valve 47 is further hung down in the horizontal direction and moved (refer to reference numeral S5), and is stored at a predetermined position on the intermediate floor F3.

As a result, carrying out and storage of the rotary valve 47 are completed.

Then, the short pipe 48 is suspended and moved with a rope 73 to an exchange position between the upper pipe 49 and the lower pipe 45 (refer to reference numeral S6), and the upper pipe lower end 56 and the short pipe 48 are moved. install the Then, the cylindrical part 54a of the sleeve joint 54 is slid downward, and the fastening band 54b is attached and fastened and fixed. Thereby, the mounting of the short pipe 48 is completed.

The procedure for replacing the single pipe 48 with the rotary valve 47 is the reverse procedure to the above.

According to this embodiment, the following effects are shown.

Between the upper pipe 49 and the lower pipe 45, an exchange part in which the rotary valve 47 and the single pipe 48 can be exchanged is provided. Thereby, when using biomass fuel, the rotary valve 47 is provided, the ejection of the pressurized gas from the grinder 5 is sealed with the rotary valve 47, and the fuel feeder 50 and the bunker upstream of it are provided. It is possible to prevent the pressurized gas from blowing up to (13). In the case of using coal fuel, a single pipe 48 is provided instead of the rotary valve 47 . In the case of coal fuel, since it is stored more densely than biomass fuel, the ejection of pressurized gas from the crusher 5 can be sealed by the fuel supply 50 or the downspout 52 upstream.

Therefore, even when biomass fuel is switched from coal fuel, the common fuel feeder 50 and the grinder 5 can be used.

At the lower end of the upper pipe 49, an upper pipe lower end 56 divided from the main body of the upper pipe 49 is provided, and the connection part between the main body of the upper pipe 49 and the upper pipe lower end 56 is a cylinder part 54a. It was decided to provide the sleeve joint 54 which covers with the fastening band 54b and fastens the cylinder part 54a with the sealing band 54b and fixes it airtightly. Thereby, when connecting the upper pipe 49 and the rotary valve 47 or the short pipe 48, the error|error of the pipe length can be absorbed, and replacement|exchange can be made easy.

When using biomass fuel and supplying water from the upper direction than the rotary valve 47, there exists a possibility that biomass fuel will absorb and wet, and may block in the rotary valve 47. Accordingly, a pedestal 58 is provided below the rotary valve and a fire extinguishing water pipe 60 is installed, so that when fire extinguishing is required, water is supplied toward the lower pipe 45 to be dispersed. Thereby, the possibility that the rotary valve 47 will be blocked by biomass fuel is avoided.

About coal supply pipes, such as the upper pipe 49 which supplies coal, the scraper which slides a pipe inner surface and removes adhering coal may be provided. However, when using coal fuel as in the present embodiment, since it is configured to be replaced with the single pipe 48 , it is structurally difficult to provide a scraper for the single pipe 48 . Therefore, the washing water nozzle 67 (refer FIG. 5) was provided in the upper pipe 49, and in the case of coal fuel, it was decided that water is spread|dispersed downward. Thereby, it becomes unnecessary to provide a scraper for the single pipe 48, and workability at the time of replacing|exchanging with the single pipe 48 can be improved.

When the short pipe 48 is mounted when using coal fuel, the coal fuel supplied from the fuel supply 50 falls and collides with the inner surface of the hopper part 70 in a state accelerated by gravity (refer to FIG. 7 ). Therefore, by providing a wear-resistant material on the inner surface of the hopper part 70, damage to the hopper part 70 can be prevented.

Moreover, the rotary valve 47 and the single pipe 48 were made interchangeable, and it was made possible to use a biomass fuel and a coal fuel separately. Thereby, during the period when biomass fuel cannot be used or during the period when biomass fuel is not used due to FIT (Feed-in Tariff: Fixed Price Purchase System) operation, since operation with coal fuel is possible, fuel supply facilities By making minimal changes to the , it is possible to suppress the increase in the size of the equipment and to operate the plant efficiently.

Moreover, in embodiment mentioned above, although demonstrated as the grinder 5 which grind|pulverizes all using biomass fuel as a biomass fuel, this invention is not limited to this, A biomass fuel is mixed with coal, It can also be used for the grinder to grind|pulverize.

1: Boiler equipment
3: Boiler body
5: grinder
7: Differential fuel supply pipe
9: Burner
11: Silos for biomass
13: Bunker
15: hot air supply pipe
17: primary ventilator
19: air preheater
21: gas recirculation ventilator
23: electrostatic precipitator
25: denitration device
27: manned ventilator
29: desulfurization device
31: chimney
40: fuel supply piping structure
42: grinding table
43: grinding roller
44: rotary separator
45: lower pipe
47: rotary valve
48: single pipe (connection pipe)
49: upper pipe
50: fuel supply
50a: seal air pipe
50a1: valve for seal air
50b: fire water piping
50b1: fire water valve
51: belt conveyor
52: down spout
54: sleeve joint
54a: Treasury
54b: fastening band (fastening fixture)
56: the lower part of the upper pipe
58: pedestal (branch piping)
60: fire water pipe (water supply part)
60a: fire water valve
61: purge air pipe
61a: valve for purge air
62: ball valve
63: cap
65: relay officer
67: washing water nozzle
68: washing water supply pipe
69: ball valve for washing water
70: hopper unit
72, 73: rope
F1: lower floor
F2: upper floor
F3: middle floor

Claims (9)

an upper pipe connected to a fuel supply for supplying the fuel before pulverization in a predetermined supply amount;
a lower pipe connected to the pulverizer to guide the fuel to the pulverizer;
provided between the upper pipe and the lower pipe, and having an exchange part in which the rotary valve and the connecting pipe can be exchanged.
Fuel supply piping structure. The method of claim 1,
The lower end of the upper pipe is provided with a lower end of the upper pipe that is divided from the main body of the upper pipe and connected to the exchange unit,
A sleeve joint having a cylinder part covering the lower end side of the main body of the upper pipe and the upper end side of the lower end part of the upper pipe, and a fastening fixture for fastening and fixing the cylindrical part from the outer periphery side.
Fuel supply piping structure. 3. The method according to claim 1 or 2,
A water supply unit for supplying water is provided vertically below the rotary valve.
Fuel supply piping structure. 4. The method of claim 3,
The water supply unit is inclined at an angle of repose or more with respect to the horizontal direction and is provided in a branch pipe that vents to the lower pipe.
Fuel supply piping structure. 5. The method of claim 4,
In the branch pipe, at least one of a purge air supply unit, a thermometer insertion unit, and a stabbing rod insertion unit is provided.
Fuel supply piping structure. The method of claim 1,
Inside the upper pipe, a washing water nozzle for supplying and dispersing water in a vertical downward direction, and a valve for controlling the supply of water are provided.
Fuel supply piping structure. The method of claim 1,
At the upper end of the lower pipe, a hopper unit is provided,
A wear-resistant material is provided on the inner surface of the hopper
Fuel supply piping structure. a bunker for storing fuel;
a fuel supply receiving fuel from the bunker and supplying it in a predetermined supply amount;
The fuel supply pipe structure according to claim 1,
A pulverizer provided vertically below the fuel supply pipe structure is provided.
fuel grinding supply system. an upper pipe connected to a fuel supply for supplying the fuel before pulverization in a predetermined supply amount;
a lower pipe connected to the pulverizer to guide the fuel to the pulverizer;
A method of operating a fuel supply piping structure provided between the upper pipe and the lower pipe and having an exchange part in which a rotary valve and a connection pipe can be exchanged, the fuel supply pipe structure comprising:
When biomass fuel is used, the rotary valve is provided instead of the connection pipe, and when coal is used, the connection pipe is provided instead of the rotary valve
How to operate the fuel supply piping structure.

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