JPH0763316A - Ash cooler for pressurized fluidized bed boiler - Google Patents

Abstract

(57) [Summary] [Structure] In the pressurized fluidized bed boiler, the inlet header 21
And an outlet header 23, a plurality of water pipes 24 that connect the headers 21 and 23, and a water pipe wall that forms a side wall together with the water pipes 24. The high temperature ash inlet 27 is provided at one end and the low temperature ash outlet 28 is provided at the other end. There is provided a vibrating ash cooler 36 formed by a main body 26 provided with a drive device 33 capable of giving the main body 26 a rapid reciprocating motion slightly upward with respect to the direction of the low temperature ash outlet 28. The ash cooler 36 has excellent wear resistance because the ash that is moved by a slightly upward reciprocating motion is slanted upward in the front and rarely slides on the inner surface of the main body 26.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ash cooler for a pressurized fluidized bed boiler.

[0002]

2. Description of the Related Art FIGS. 4 and 5 show the outline of the structure of an example of a conventional 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 for separating 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 the pressure reducer 4 Second cyclone 5 downstream of
, A buffer bin 6 is connected to the downstream side of the cyclone 5, and screw conveyors (screw ash coolers) 8 and 8 connected to the cutout of the buffer bin 6 via a rotary feeder 7 are provided in two stages. A hopper 9 is connected to the downstream side of the screw conveyors 8 and a silo 10 is provided on the downstream side of the hopper 9.

As shown in FIG. 5, the screw conveyors (screw type ash coolers) 8 have a high temperature ash inlet 11 at the upper outer periphery of one end and a low temperature ash outlet 12 at the lower outer periphery of the other end. A U-shaped trough 14 having a double structure is provided with a water supply outlet 13 on the lower side of the outer periphery of the end portion on the side of the high temperature ash inlet 11 so that cooling water can flow, and both ends of the trough 14 are rotatable. A hollow shaft 16 that is supported and has a water supply inlet 15 at one end located on the low temperature ash outlet 12 side of the trough 14, a screw-shaped blade 17 attached around the hollow shaft 16, and a blade 17 of the blade 17. A screw 19 is formed, which extends along the outer edge and has an end portion on the side opposite to the water supply inlet 15 that communicates with the hollow inside of the hollow shaft 16 and a cooling water pipe 18 that communicates with the end portion on the side of the water supply inlet 15 inside the double structure of the trough 14. Prepared, high temperature ash inlet 1 Ashes supplied from is formed so as to be cooled while moving in the trough 14.

The ash separated from the exhaust gas discharged from the boiler 2 by the cyclone 3 is guided to the pressure decompressor 4 to reduce the pressure, and the high temperature ash separated by the cyclone 5 from the ash passed through the decompressor 4 is temporarily stored in the buffer bin 6. Are stored in the buffer bin 6, quantitatively cut out from the buffer bin 6 by the rotary feeder 7, and supplied to the screw conveyors 8, 8.

The high temperature ash (arrow a in FIG. 5) supplied to the screw conveyors 8 and 8 is fed from the high temperature ash inlet 11 to the trough 1.
4 into the low temperature ash outlet 1 by the rotating blades 17.
When the water is transferred to the second side, the cooling water supplied from the water supply inlet 15 passes from the hollow inside of the hollow shaft 16 through the cooling water pipes 18 of the blades 17 to the double structure of the trough 14 and is discharged from the water supply outlet 13. It is cooled to a required low temperature by exchanging heat with (FIG. 5 arrow b), flows out from the low temperature ash outlet 12 to the silo 10 through the hopper 9, and is stored in the silo 10.

[0006]

However, the above-mentioned screw conveyor (screw ash cooler) 8 is inferior in abrasion resistance and is not suitable for handling ash having a large abrasion effect. In particular, when the cooling water pipe 18 provided at the outer edge of the blade 17 is worn and partly damaged and the cooling water leaks, the cooling water and the limestone that remains in the ash and is left in the furnace for desulfurization. Mixes with and generates heat, and trough 1
There is a problem in that the screw conveyor 8 cannot be used because it is fixed inside the screw conveyor 4.

The present invention has been made in view of the above-mentioned circumstances, and an object thereof is to provide an ash cooler for a pressurized fluidized bed boiler in which a cooling structure is added to a vibration type feeder having a low wear action.

[0008]

SUMMARY OF THE INVENTION The present invention is a ash cooler for a pressurized fluidized bed boiler that cools while cutting out ash separated from exhaust gas of a boiler provided in a pressure vessel, and an inlet header and an outlet header. It is composed of a plurality of water pipes that communicate the both headers and a water pipe wall that forms a side wall together with the water pipes, and is tubular with both ends closed, and has a high temperature ash inlet at one end and a low temperature ash outlet at the other end, and An ash cooler for a pressurized fluidized bed boiler, characterized in that it is formed by a swingably provided main body and a drive device that can give vibration to the main body to move ash toward the low temperature ash outlet direction. It is a thing.

[0009]

Therefore, according to the present invention, the high temperature ash supplied from the high temperature ash inlet into the main body moves through the water pipe from the inlet header while being transferred to the low temperature ash outlet by the reciprocating motion given to the main body by the driving device. It exchanges heat with the cooling water flowing to the outlet header.

[0010]

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

FIGS. 1 to 3 are sectional views showing the outline of an embodiment of an ash cooler for a pressurized fluidized bed boiler according to the present invention. In the figure, the same parts as those in FIG.

In this embodiment, an inlet header 21 having a water supply inlet 20 and an outlet header 23 having a water supply outlet 22 are arranged so as to face each other with a predetermined gap, and the inlet header 21 and the outlet header 23 are arranged. Are connected to each other by a plurality of water pipes 24 extending in parallel with each other at a predetermined interval in the circumferential direction of both headers 21 and 23, and the water pipes 24 are connected by water pipe walls 25 to form side walls. A cylindrical main body 26 having a closed end is provided, and a high temperature ash inlet 27 is provided at one end of the main body 26 and a low temperature ash outlet 28 is provided at the other end.

Further, the frame 29 and the four guide columns 3 which are inclined at a predetermined angle at four positions on the front, rear, left and right of the frame 29 and which are inclined forward (on the B side in FIG. 2) at a predetermined angle.
A spring 3 provided with 0 and 30 and fitted on the guide columns 30 and 30 and capable of expanding and contracting along the guide columns 30 and 30.
1, 31 are provided, a drive device 33 having output shafts 32 extending to both sides in the width direction of the frame 29 is provided at a substantially central portion of the frame 29, and cranks 34 are provided at both ends of the output shaft 32.

The main body 26 is attached to the tips of the springs 31 and 31, and the low temperature ash outlet 28 is connected to the frame 29.
Of the main body 26 and the front end portion of the crank 34 are connected by a connecting rod 35, and the drive device 33 is operated to connect the crank 34 to the crank 34. A vibrating ash cooler 36 is provided via the rod 35 so as to give a quick reciprocating motion to the main body 26 in a slightly upward and backward direction along the expansion and contraction direction of the springs 31, 31.

Next, the operation will be described. High-temperature ash quantitatively cut out from the buffer bin 6 by the rotary feeder 7 as in the case of the conventional example (arrow a in FIG. 2).
Flows from the high temperature ash inlet 27 into the main body 26 and is transferred to the low temperature ash outlet 28 side by the fast reciprocating motion of the main body 26 driven by the drive device 33, and is supplied from the water supply inlet 20 to the inlet header 21. It is cooled to a required low temperature by exchanging heat with the cooling water (arrow b in FIG. 2) discharged from the water supply outlet 22 of the outlet header 23 after passing through the plurality of water pipes 24, and is cooled from the low temperature ash outlet 28 to the hopper. It flows out to the silo 10 via 9, and is stored in the silo 10.

According to the above description, the spring 31 that expands and contracts along the guide column 30 that is provided on the frame 29 while tilting forward.
A vibrating ash cooler 36 is formed so that the main body 26 is attached to the tip of the main body 26 and a slightly upward upward reciprocating motion can be given to the main body 26 by the drive device 33 through the crank 34 and the connecting rod 35. Since the ash is supplied from the high temperature ash inlet 27 into the main body 26, the ash is not slanted upward and slid upward and is less likely to slide on the inner surface of the main body 26, so that wear of the water pipe 24 can be suppressed.

The present invention is not limited to the above-described embodiment, and for example, instead of the guide columns 30 and 30 and the springs 31 and 31 for supporting the main body 26, a leaf spring inclined rearward of the frame 29 is used. Needless to say, various modifications can be made within the range not departing from the gist of the present invention.

[0018]

According to the ash cooler for a pressurized fluidized bed boiler of the present invention, various excellent effects as described below can be obtained.

I) The ash that moves by a slightly upward upward reciprocating motion (vibration) forwards is slid upward obliquely upward and rarely slides on the inner surface of the main body, so that abrasion of the water pipe can be suppressed.

II) The thickness of the water pipe can be freely set.

III) According to the above items I) and II), it is possible to prevent the water pipe from being damaged and causing water leakage, and the cooling water and the ash content being mixed with each other to generate heat and adhere.

[Brief description of drawings]

FIG. 1 is a configuration diagram schematically showing a pressurized fluidized bed boiler to which an ash cooler of the present invention is applied.

FIG. 2 is a side view schematically showing an embodiment of an ash cooler related to FIG.

FIG. 3 is a view taken along the line III-III in FIG.

FIG. 4 is a configuration diagram showing an outline of an example of a conventional pressurized fluidized bed boiler.

5 is a cross-sectional view schematically showing an example of a screw-type ash cooler related to FIG.

[Explanation of symbols]

 1 Pressure Vessel 2 Boiler 3 Cyclone 4 Pressure Reducer 5 Cyclone 21 Inlet Header 23 Outlet Header 24 Water Pipe 25 Water Pipe Wall 26 Main Body 27 High Pressure Ash Inlet 28 Low Pressure Ash Outlet 33 Drive Unit

Claims (1)

[Claims] 1. In an ash cooler for a pressurized fluidized bed boiler, which cools while cutting out ash separated from the exhaust gas of a boiler provided in a pressure vessel, a plurality of inlet headers and outlet headers and a plurality of communicating headers are provided. A main body comprising a water pipe and a water pipe wall forming a side wall together with the water pipe, having a tubular shape with both ends closed and having a high-temperature ash inlet at one end and a low-temperature ash outlet at the other end and swingably provided; An ash cooler for a pressurized fluidized bed boiler, wherein the ash cooler is formed by a drive device capable of giving vibration to the main body to move ash toward the low temperature ash outlet.