JPH0223931Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to an apparatus for supplying powdered fuel from a fuel discharging storage tank of a fluidized bed boiler to a fuel transport pipe.

BACKGROUND ART Conventionally, when supplying granular fuel to a fluidized bed boiler by pneumatic transportation, as shown in FIG. It is supplied from an input port 5 of a conveyor 4 connected to a storage tank 3, and is introduced into the storage tank 3 by an input conveyor 6 by sequentially opening and closing a slide gate valve 7 appropriately disposed on the storage tank 3 and stored therein. Thereafter, the fuel 2 is supplied to the fuel transport pipe 1 by a feeder 8 provided at the bottom of the storage tank 3.
After being pneumatically transported to the bottom of the fluidized bed boiler 1 in the air flow generated by the transport air supply device 11, and ejected into the fluidized medium 13 through a large number of branch pipes 12 and burned, Combustion gas is collected by dust collector 1
4 and is released from the chimney 15.

Problems to be solved by the invention Since the transport air in the fuel transport pipe 10 is injected into the fluidized medium 13 spread thickly at the bottom of the fluidized bed boiler 1, it is necessary to overcome the resistance, so the pressure is higher than atmospheric pressure. However, since the feeder 8 is difficult to have an airtight structure, the transport air will blow out into the storage tank 3 at atmospheric pressure, which is lower than the pressure inside the fuel transport pipe 10, making it difficult to cut out the fuel 2. There are problems in that the air flows out into the input conveyor 6 and conveyor 4 through the slide gate valve 7 at the outlet, making it difficult to dispose of the dust.

The present invention was made to solve the above problems, and the dispensing storage tank has a sealed structure with a fuel inlet in the upper part and a supply machine in the lower part, and the pressure is equal to or slightly higher than that of the transport air in the fuel transport pipe. The object of the present invention is to provide a fuel supply system for a fluidized bed boiler, in which fuel is transported by compressed air using a transport device into a storage tank into which highly pressurized air is introduced.

Means for Solving the Problems The fuel supply device for a fluidized bed boiler of the present invention has a first
To explain using the numbers in the figure, granular fuel is cut out into a fuel transport pipe 10 by a feeder 8 provided at the lower part of a storage tank 3 for discharging granular fuel, and transport air is supplied to this fuel transport pipe 10. In a device configured to pneumatically transport powdered fuel to the bottom of the fluidized bed boiler 1 by supplying compressed air from the device 11, a pressure regulator 16 is provided between the transport air supply device 11 and the fuel transport pipe 10. The upstream side of this pressure regulator 16 and the dispensing storage tank 3 are connected so that air at a pressure equal to or slightly higher than the air pressure of the fuel transport pipe 10 can be introduced into the dispensing storage tank 3. A receiving switching valve 20, a compressed air introduction valve 24, and an exhaust valve 21 are arranged so that fuel is force-fed from a transportation container 23 equipped with a discharge valve 22 at the lower part to a discharging storage tank 3 via a switching valve 27. It is characterized by what it did.

Function The compressed air generated by the transport air supply device 11 is
The pressure regulator 16 introduces the air into the storage tank 3 at a pressure equal to or slightly higher than that of the transport air. On the other hand, fuel is charged into the transport container 23 by the charging conveyor 18.
In this case, the exhaust valve 22 is closed, the exhaust valve 21 is opened, the internal pressure is set to atmospheric pressure, the switching valve 20 is opened, and fuel is input from the input conveyor 18. When a predetermined level is reached, the switching valve 20 and exhaust valve 21 are closed. The compressed air introduction valve 24, the discharge valve 22, and the switching valve 27 are opened to introduce compressed air into the transportation container 23 and to charge fuel into the storage tank 3. Thereafter, the switching valve 27 is closed and the fuel is cut into the fuel transport pipe 10 by the feeder 8.

Embodiment Hereinafter, an embodiment of the present invention will be described based on FIG. A pressure regulator 16 is provided between the transport air supply device 11 and the fuel transport pipe 10, and this pressure regulator 1
6 and the dispensing storage tank 3 are connected by a pipe 17 so that air at a pressure equal to or slightly higher than the air pressure of the fuel transport pipe 10 can be introduced into the storage tank 3. On the other hand, a switching valve 20 is connected to the input conveyor 18. A transport container 23 equipped with an exhaust valve 21 in the upper part and a discharge valve 22 in the lower part is connected through the transport container 23, and another transport air supply device 26 is connected to this transport container 23 through a pipe 25 having a compressed air introduction valve 24. The discharge valve 22 is connected to the dispensing storage tank 3 via a pipe 28 having a switching valve 27.
A pressure regulating valve 30 is provided in the dispensing storage tank 3. In addition, in FIG. 1, the transportation container 2
3 is shown, however, depending on the amount of transport, one or three or more transport containers may be provided.

The compressed air generated by the transport air supply device 11 is
A pressure regulator 16 provided on the upstream side of the fuel transport pipes 10 each connected to the feeder 8 at the bottom of the storage tank 3
Accordingly, the air is introduced into the storage tank 3 through the pipe 17 at a pressure equal to or slightly higher than that of the transport air. on the other hand,
Fuel input from the inlet 32 of the conveyor 31 is input into the transport pipe container 23 by the input conveyor 18. To input fuel into the transport container 23, close the discharge valve 22, open the exhaust valve 21, make the interior atmospheric pressure, open the switching valve 20, input fuel from the input conveyor 18, and when the level reaches a predetermined level, the switching valve will open. 2
0 and exhaust valve 21 are closed, compressed air introduction valve 24, discharge valve 22, and switching valve 27 are opened, compressed air generated by transportation air supply device 26 is introduced into transportation container 23 through piping 25, and fuel is supplied through piping 28. Pour into storage tank 3. Transport container 23, exhaust valve 21, exhaust valve 2
2. When installing multiple transportation devices each consisting of a switching valve 20 and a compressed air introduction valve 24, while fuel is being discharged from the transportation container 23, open the switching valve of another transportation container to receive fuel, and alternately receive and receive fuel. The fuel is transported to the storage tank 3 and charged by repeating the discharge operation. The pressure regulating valve 30 is for releasing excess air from the storage tank 3.

Effects of the Invention As explained above, according to the present invention, the fuel in the dispensing storage tank can be easily cut out into the fuel transport pipe, and the transport air is prevented from flowing out into the conveyor system through the storage tank. In addition, it is possible to increase the number of feeders according to the capacity of the fluidized bed boiler, and the pressure of the transport air can be selected as appropriate, and there is no functional problem even if the feeder wears out to some extent. There are advantages such as

[Brief explanation of the drawing]

FIG. 1 is a systematic explanatory diagram showing one embodiment of the present invention, and FIG. 2 is a systematic explanatory diagram showing an example of a conventional fuel supply system for a fluidized bed boiler. DESCRIPTION OF SYMBOLS 1...Fluidized bed boiler, 2...Fuel, 3...Discharge storage tank, 4...Conveyor, 5...Input port, 6...
...Input conveyor, 7...Slide gate valve, 8...
... Supply machine, 10 ... Fuel transport pipe, 11 ... Transport air supply device, 12 ... Branch pipe, 13 ... Fluid medium, 14 ... Dust collector, 15 ... Chimney, 16 ...
Pressure regulator, 17...Piping, 18...Input conveyor, 20...Switching valve, 21...Exhaust valve, 22...
Discharge valve, 23...Transportation container, 24...Compressed air introduction valve, 25...Piping, 26...Transportation air supply device, 27...Switching valve, 28...Piping, 30...Pressure adjustment valve, 31... ...Conveyor, 32...Inlet.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. Powder and granular fuel is cut into a fuel transport pipe by a feeder installed at the bottom of a storage tank for discharging powder and granular fuel, and compressed air is supplied from a transport air supply device to this fuel transport pipe. In a device that pneumatically transports granular fuel to the bottom of a fluidized bed boiler, a pressure regulator is provided between the transport air supply device and the fuel transport pipe, and the upstream side of this pressure regulator and the discharge The tank is connected to the dispensing tank in such a way that air can be introduced into the tank at a pressure equal to or slightly higher than that of the fuel transport pipe, while a switching valve for receiving fuel, a compressed air introduction valve, and an exhaust valve are installed at the top. ,
1. A fuel supply device for a fluidized bed boiler, characterized in that fuel is forced into a discharge storage tank via a switching valve from a transportation container equipped with a discharge valve at the bottom. 2. A fuel supply system for a fluidized bed boiler as set forth in claim 1 of the registered utility model, which includes a plurality of transport containers arranged in parallel.