JPH0763318A - Bed material discharge device for pressurized fluidized bed boiler - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a bed material discharging device for a pressurized fluidized bed boiler having a low degree of wear and simple equipment. In a pressurized fluidized bed boiler that discharges bed material from a boiler 2 provided in a pressure vessel 1 through a lock hopper 6, a pressurizing pipe 21 is connected to the bottom of the lock hopper 6, and the lock hopper 6 A transport pipe 24 having a tip portion 24a that opens downward in the lock hopper 6 is connected to the middle portion. [Effect] The flow of the pressurized air flowing from the pressure pipe 21 through the lock hopper 6 to the transport pipe 24 discharges the bed material to the outside of the lock hopper 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bed material discharging device for a pressurized fluidized bed boiler.

[0002]

2. Description of the Related Art FIG. 2 shows an outline of an example of a conventional bed material discharging apparatus for a pressurized fluidized bed boiler, 1 is a pressure vessel, and the boiler 2 and the boiler 2 are discharged into the pressure vessel 1. A cyclone 3 that separates the ash that is separated from the exhaust gas, and a pressure reducer 4 that reduces the pressure of the ash that is separated by the cyclone 3 is provided outside the pressure vessel 1 and connected to the cyclone 3, and is further illustrated. Not connected to cyclones or ash coolers.

On the other hand, a lock hopper 6 provided outside the pressure vessel 1 is connected to the bottom of the boiler 2 via a discharge pipe 5, and air is discharged into the discharge pipe 5 when discharging the bed material in the boiler 2. An L valve 7 for supplying is provided at a position of the discharge pipe 5 close to the boiler 2, and two opening / closing valves 8, 8 are arranged on the lock hopper 6 side of the L valve 7.

Further, the boiler 2 and the lock hopper 6 are connected by a pressure equalizing pipe 9 which communicates with each other, and two pressure equalizing valves 10 and 10 provided on the pressure equalizing pipe 9 are opened and closed as needed to connect the boiler 2 to the boiler 2. It is formed so that the internal pressure with the lock hopper 6 can be made uniform.

The lock hopper 6 is provided with an air vent pipe 12 having an opening / closing valve 11 at the top and a cutout pipe 14 having two outlet valves 13, 13 at the bottom, and the cutout pipe 14
Is connected to the intake pipe 15, an air intake valve 16 is provided at one end of the intake pipe 15, and a suction device 17 is connected to the other end of the intake pipe 15 to suction the connection portion of the cutout pipe 14. A cyclone 18 and a bag filter 19 are provided in series in the intake pipe 15 between the device 17 and an ash silo 20 is connected to the cyclone 18 and the bag filter 19 and separated into the ash silo 20 by the cyclone 18. Alternatively, it is formed so that the bed material captured by the bag filter 19 can be stored.

When discharging the bed material in the boiler 2, the on-off valves 8 of the discharge pipe 5 are opened and the pressure equalizing valve 1 of the pressure equalizing pipe 9 is opened.
After opening 0 and 10, discharge pipe 5 through L valve 7
When air having a predetermined pressure (arrow a in FIG. 2) is supplied to the inside, the bed material in the boiler 2 moves from the boiler 2 to the lock hopper 6 along with the flow of the air.

After that, the air supply from the L valve 7 is stopped, the opening / closing valves 8 and 8 of the discharge pipe 5 are closed, and the pressure equalizing valves 10 and 10 of the pressure equalizing pipe 9 are closed, and then the open / close valve 1 of the air vent pipe 12.
1 is opened to release the pressure in the lock hopper 6, the suction device 17 is operated, and the outlet valves 13, 13 of the cutout pipe 14 are opened, so that the bed material in the lock hopper 6 passes through the cutout pipe 14 and the intake pipe. The fine powder of the bed material, which has flown out to 15, is separated from the air in the cyclone 18 and is introduced into the silo 20, and has passed through the cyclone 18 together with the air is captured by the bag filter 19 and introduced into the ash silo 20.

[0008]

However, in the bed material discharging device of the above-mentioned pressurized fluidized bed boiler, since the bed material in the lock hopper 6 is sucked by the suction device 17, the equipment is worn. In addition, the discharge route of the bed material is in the form of natural fall, so that the size of the outlet valve 13 is relatively large. Further, since the vacuum transfer equipment or the low pressure transfer equipment such as the cyclone 18, the bag filter 19 and the suction device 17 is required, there is a problem that the equipment is complicated.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a bed material discharging device for a pressurized fluidized bed boiler of a pressure transportation type which has a low degree of wear and requires a simple facility. .

[0010]

According to the present invention, a boiler is provided in a pressure vessel to form a pressurized fluidized bed boiler, and a lock hopper for storing bed material discharged from the boiler is connected to the boiler to lock the boiler. Pressurized flow, characterized in that a pressurizing pipe for supplying pressurized air for conveying bed material is connected to the bottom of the hopper, and a transport pipe for pressurizing and conveying bed material from the lock hopper is connected to the lock hopper. The present invention relates to a bed material discharging device of a multi-layer boiler.

[0011]

Therefore, in the present invention, the flow of the pressurized air supplied into the lock hopper through the pressure pipe and flowing out of the lock hopper through the transportation pipe locks the bed material sent from the boiler to the lock hopper. Discharge to the outside of the hopper.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic diagram showing an embodiment of a bed material discharging device for a pressurized fluidized bed boiler according to the present invention. In the figure, the same parts as those in FIG.

In the present embodiment, a pressure pipe 21 communicating with a pressure device (not shown) is connected to the bottom of the lock hopper 6, and a pressure valve 22 is provided near the lock hopper 6 of the pressure pipe 21. , A tip portion 24 penetrating the middle portion of the lock hopper 6 and opening downward in the lock hopper 6.
A transport pipe 24 having a and communicating with the ash silo 23 is provided, and two transport valves 25, 25 are arranged near the lock hopper 6 of the transport pipe 24.

Next, the operation will be described. As in the conventional example shown in FIG. 2, the opening / closing valves 8, 8 of the discharge pipe 5 connected to the lock hopper 6 from the boiler 2 are opened and the pressure equalizing valves 10, 8 of the pressure equalizing pipe 9 are opened. After 10 is opened, air having a predetermined pressure (arrow a in FIG. 1) is supplied into the discharge pipe 5 through the L valve 7, and the bed material in the boiler 2 rides on the above-mentioned flow of air from the boiler 2. Move to lock hopper 6.

After that, the air supply from the L valve 7 is stopped, the open / close valves 8 and 8 of the discharge pipe 5 are closed, the pressure equalizing valves 10 and 10 of the pressure equalizing pipe 9 are closed, and then the open / close valve 1 of the air vent pipe 12 is closed.
1 is opened to release the air in the lock hopper 6 to reduce the pressure in the lock hopper 6 to about 2 kg / cm ² and then the on-off valve 11 of the air vent pipe 12 is closed.

Next, when a pressure device (not shown) is operated to open the pressure valve 22 provided in the pressure pipe 21 and open the transport valves 25, 25 provided in the transport pipe 24, the bed in the lock hopper 6 is opened. The material is supplied into the lock hopper 6 through the pressure pipe 21 and flows out of the lock hopper 6 through the transport pipe 24 to the outside of the lock hopper 6 under the pressure of about 4 kg / cm ² of compressed air (see FIG. 1).
It is discharged to the ash silo 23 through the transport pipe 24 in the flow of arrow b).

According to the above, the bed material in the lock hopper 6 is formed so that it can be carried on the flow of pressurized air and discharged to the ash silo 23 via the transport pipe 24, so that simple equipment is required and addition is possible. Due to pressure transportation, the degree of wear is reduced.

The present invention is not limited to the above-described embodiments, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

[0020]

According to the bed material discharging device of the pressurized fluidized bed boiler of the present invention, various excellent effects as described below can be obtained.

I) Pressurized transportation and low degree of wear.

II) It is economically very useful because it requires only simple equipment.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an embodiment of a bed material discharging device for a pressurized fluidized bed boiler of the present invention.

FIG. 2 is a schematic diagram showing an example of a bed material discharging device of a conventional pressurized fluidized bed boiler.

[Explanation of symbols]

 1 Pressure Vessel 2 Boiler 6 Lock Hopper 21 Pressurized Pipe 24 Transport Pipe

Claims (1)

[Claims] 1. A boiler is provided in a pressure vessel to form a pressurized fluidized bed boiler, a lock hopper for storing bed material discharged from the boiler is connected to the boiler, and the bed material is conveyed to the bottom of the lock hopper. 2. A bed material discharging device for a pressurized fluidized bed boiler, wherein a pressurizing pipe for supplying pressurized air is connected to the lock hopper, and a transport pipe for pressurizing and transporting the bed material from the lock hopper is connected to the lock hopper.