JPS6350585Y2 - - 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 combusted, 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.The dispensing storage tank is made into an airtight structure, a relay container is appropriately arranged on the storage tank to separate it from the input conveyor, and a fuel transport pipe is connected to the storage tank. The purpose of the present invention is to provide a fuel supply system for a fluidized bed boiler, which prevents transport air from blowing out from a supply machine into a storage tank by introducing air at a pressure equal to or slightly higher than the air pressure. be.

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 figures and the numbers in FIG. In this device, a fuel transport pipe 10 is cut out, and compressed air is supplied to the fuel transport pipe 10 from a transport air supply device 11 to pneumatically transport the granular fuel to the bottom of the fluidized bed boiler 1. 3 and the input conveyor 6, a relay container 16 is provided to prevent the air in the dispensing storage tank 3 from flowing out to the outside, and the pressure is adjusted between the transport air supply device 11 and the fuel transport pipe 10. A pressure regulator 17 is provided, and the upstream side of this pressure regulator 17 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. The relay container 16 is characterized in that an upper damper 20 and a lower damper 21 are provided above and below with a relay chamber 22 in between.

Function The compressed air generated by the transport air supply device 11 is
The pressure is the same or slightly reduced by the pressure regulator 17, and the pressure is made to flow into the fuel transport pipes 10 connected to the feeder 8, respectively, and the pressure is equal to or slightly higher than that of the fuel transport pipe 10 in a pipe branched from the upstream side of the pressure regulator 17. of air is introduced into the storage tank 3. At this time, if the lower damper 21 of the relay container 16 is closed, the inside of the storage tank 3 is maintained at a pressure equal to or slightly higher than the pressure of the transport air, thereby preventing transport air from flowing into the storage tank 3 from the supply device 8. At the same time, the fuel 2 can be easily cut out into the fuel transport pipe 10 by driving the supply device 8. On the other hand, when the lower damper 21 is closed, the upper damper 20 is open.
Fuel is easily introduced into the relay chamber 22 by the input conveyor 6. When the fuel in the relay chamber 22 reaches a predetermined level, the upper damper 20 is closed and the lower damper 21 is opened to allow the fuel to fall into the storage tank 3.

Embodiment Hereinafter, an embodiment of the present invention will be described based on FIGS. 1 and 2. As shown in FIG. 1, a relay container 16 is provided between the dispensing storage tank 3 and the input conveyor 6 to prevent the air in the dispensing storage tank 3 from flowing out to the outside, and a transport air supply device 11 is provided. A pressure regulator 17 is provided between the and the fuel transport pipe 10,
The upstream side of this pressure regulator 17 and the dispensing storage tank 3 are connected by a pipe 18. As shown in FIG. 2, the relay container 16 has an upper damper 20 and a lower damper 21.
(opening/closing mechanisms are not shown) are arranged above and below a relay chamber 22, and the relay chamber 22 communicates with the storage tank 3 and the atmosphere through equal pressure valves 23 and through equal pressure pipes 24, 25, and 26, respectively. are doing.

The compressed air generated by the transport air supply device 11 is
The pressure regulator 17 lowers the pressure to the same level or slightly and causes the fuel to flow into the fuel transport pipes 10 connected to the feeder 8, and the pressure is equal to or slightly higher than that of the fuel transport pipe 10 in a pipe branched from the upstream side of the pressure regulator 17. Air is introduced into the reservoir 3. At this time, when the lower damper 21 of the relay container 16 is closed and the equal pressure valve 23 is closed, the inside of the storage tank 3 is maintained at a pressure equal to or slightly higher than the pressure of the transport air, so that the transport air from the supply device 8 to the storage tank 3 is maintained at a pressure equal to or slightly higher than that of the transport air. The inflow of fuel 2 is prevented, and the fuel 2 can be easily cut out into the fuel transport pipe 10 by driving the supply device 8. On the other hand, when the lower damper 21 is closed, the upper damper 20
is opened and the relay chamber 22 is communicated with the atmosphere through the equal pressure valve 23, so that the fuel 2 transported by the conveyor 4
is easily fed into the relay room 22 by the feeding conveyor 6. When the fuel in the relay chamber 22 reaches a predetermined level in this way, the upper damper 20 is closed and the equal pressure valve 23 is switched so that the relay chamber 22 communicates with the storage tank 3. When the lower damper 21 is opened, the fuel 2 in the relay chamber 22 easily falls into the storage tank 3. By sequentially repeating this operation, the fuel 2 can be supplied to the storage tank 3 while the air pressure in the storage tank 3 is always maintained at the same level or slightly higher than that in the fuel transport pipe 10.

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 and relay vessels according to the capacity of the fluidized bed boiler, and the pressure of the transport air can be selected appropriately. It has the advantage of not causing any problems.

[Brief explanation of the drawing]

Fig. 1 is a systematic explanatory diagram showing one embodiment of the present invention, Fig. 2 is an explanatory diagram showing details around the relay vessel in Fig. 1, and Fig. 3 is an example of a conventional fluidized bed boiler fuel supply system. FIG. 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...Relay container, 17...Pressure regulator, 1
8... Piping, 20... Upper damper, 21... Lower damper, 22... Relay room, 23... Equal pressure valve, 24, 25,
26...Isobaric tube.

Claims (1)

[Scope of utility model registration request] The granular fuel is put into a delivery storage tank by an input conveyor, the granular fuel is cut into a fuel transport pipe by a feeder installed at the bottom of the delivery tank, and compressed from a transport air supply device to this fuel transport pipe. In a device that supplies air to pneumatically transport granular fuel to the bottom of a fluidized bed boiler, a system is installed between the payout storage tank and the input conveyor to block the air in the payout storage tank from flowing out to the outside. A pressure regulator is provided between the transport air supply device and the fuel transport pipe, and the upstream side of the pressure regulator and the dispensing storage tank are connected to the dispensing storage tank. 1. A fuel supply device for a fluidized bed boiler, characterized in that the relay vessel is connected to allow introduction of air at a pressure equal to or slightly higher than the pressure, and that an upper damper and a lower damper are provided above and below with a relay chamber in between.