A dry coal powder gasification ash removal device with a shared exhaust filter

Abstract

The present invention discloses a dry coal powder gasification ash removal device with a common exhaust filter; the outlet of the ash-containing synthesis gas pipeline is connected to the inlet of the fly ash filter, the top outlet of the fly ash filter is connected to the clean synthesis gas pipeline, the bottom outlet of the fly ash filter is connected to the inlet of the fly ash storage tank, the bottom outlet of the fly ash storage tank is connected to the inlet of the fly ash lock bucket, the bottom outlet of the fly ash lock bucket is connected to the inlet of the fly ash air lift tank, the bottom outlet of the fly ash air lift tank is connected to the inlet of the fly ash silo, and the bottom outlet of the fly ash silo is connected to an external fly ash discharge pipeline. By sharing an exhaust filter and a back-blowing system, exhaust filtration systems at various levels are omitted, and exhaust gases from the fly ash lock bucket, the fly ash air lift tank and the fly ash silo are all passed into the exhaust filter for filtration and back-blowing, which has a simple structure, saves equipment investment, reduces frame height, and reduces the amount of back-blowing nitrogen.

Description

Technical Field

[0001] The invention belongs to the field of coal gasification, and relates to a dry coal powder gasification and ash removal device, and in particular to a dry coal powder gasification and ash removal device sharing an exhaust filter. Background Art

[0002] Coal gasification is an important technology and main means to achieve comprehensive utilization of coal and clean coal technology. It is the leader in the development of modern coal chemical industry, coal-to-oil, fuel gas and other industrial production. The dry ash removal system is an important unit of coal gasification, which is characterized by high ash removal efficiency, no sewage discharge, environmental protection and high efficiency. After the fly ash produced by coal gasification leaves the gasifier and waste boiler with the synthesis gas, it first passes through the fly ash filter for dry ash removal. The filter removes most of the fly ash in the synthesis gas, and then enters the wet scrubbing unit for further fine dust removal.

[0003] The fly ash removed by the fly ash filter is first stored in the fly ash storage tank. After reaching a certain material level, it is connected to the fly ash lock bucket and discharged into the fly ash lock bucket. Then the fly ash lock bucket and the upper and lower equipment are isolated for pressure relief. When the pressure is equal to the pressure of the fly ash air lift tank at the bottom, the fly ash lock bucket and the fly ash air lift tank are connected for ash discharge. The fly ash is repeatedly air-lifted by low-pressure nitrogen in the air lift tank and then discharged into the fly ash silo. During the entire ash discharge process, pressure relief and air lift exhaust are required. In the traditional process, each exhaust device is equipped with a corresponding exhaust filter and a nitrogen backflush system that matches the exhaust filter, resulting in more equipment for the dry ash removal system, high investment, and more complicated processes; and the backflush nitrogen consumption is high, which affects the composition of the synthesis gas.

[0004] Therefore, in order to avoid the disadvantages of this multi-stage exhaust filtration and back-blowing system, it is necessary to design a dust removal system with high dust removal efficiency, good dust removal effect and high flexibility to solve the above problems. Summary of the invention

[0005] The object of the present invention is to overcome the above-mentioned shortcomings of the prior art and to provide a dry coal powder gasification and ash removal device with a common exhaust filter, which has a simple structure and a low backwash gas consumption.

[0006] The dry coal powder gasification ash removal device with a common exhaust filter of the present invention comprises an ash-containing synthesis gas pipeline, a fly ash filter, a clean synthesis gas pipeline, a fly ash storage tank, a fly ash lock hopper, a fly ash gas lift tank, a fly ash silo and an exhaust filter;

[0007] The outlet of the ash-containing syngas pipeline is connected to the inlet of the fly ash filter, the top outlet of the fly ash filter is connected to the clean syngas pipeline, the bottom outlet of the fly ash filter is connected to the inlet of the fly ash storage tank, the bottom outlet of the fly ash storage tank is connected to the inlet of the fly ash lock hopper, the bottom outlet of the fly ash lock hopper is connected to the inlet of the fly ash air lift tank, the bottom outlet of the fly ash air lift tank is connected to the inlet of the fly ash silo, and the bottom outlet of the fly ash silo is connected to an external fly ash discharge pipeline;

[0008] The top outlet of the fly ash lock hopper, the top outlet of the fly ash air lift tank and the top outlet of the fly ash silo are connected to the inlet of the exhaust filter, and the bottom outlet of the exhaust filter is connected to the inlet of the lower part of the fly ash silo.

[0009] It also includes a high-pressure nitrogen pipeline, wherein the high-pressure nitrogen pipeline is connected to the ramming inlet of the fly ash lock bucket.

[0010] It also includes a low-pressure nitrogen pipeline, wherein the low-pressure nitrogen pipeline is connected to the ramming inlet of the fly ash air lift tank.

[0011] It also includes a backflush nitrogen pipeline, wherein the backflush nitrogen pipeline is connected to the backflush gas inlet of the exhaust filter.

[0012] The side of the fly ash storage tank is connected with the side of the fly ash lock hopper.

[0013] A backflush nitrogen buffer tank is provided on the backflush nitrogen pipeline.

[0014] A first valve is arranged on the high-pressure nitrogen pipeline.

[0015] A second valve is arranged on the low-pressure nitrogen pipeline.

[0016] A third valve is provided on the backflush nitrogen pipeline.

[0017] A fourth valve is provided at the bottom outlet of the fly ash silo.

[0018] The present invention has the following beneficial effects:

[0019] The dry pulverized coal gasification ash removal device with a common exhaust filter described in the present invention, during specific operation, uses a common exhaust filter to omit exhaust filtration systems at various levels, and all exhaust gases from the fly ash lock hopper, fly ash gas lift tank and fly ash silo are passed into the exhaust filter for filtration and backblowing. The structure is simple, equipment investment is saved, frame height is reduced, and the amount of backblowing nitrogen used is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the present invention.

[0021] Among them, 1 is a fly ash filter, 2 is a fly ash storage tank, 3 is a fly ash lock hopper, 4 is a fly ash air lift tank, 5 is a fly ash silo, 6 is an exhaust filter, and 7 is a back-blowing nitrogen buffer tank. DETAILED DESCRIPTION

[0022] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0023] refer to Figure 1 The dry pulverized coal gasification and ash removal device with a common exhaust filter described in the present invention comprises an ash-containing synthesis gas pipeline, a fly ash filter 1, a clean synthesis gas pipeline, a fly ash storage tank 2, a fly ash lock hopper 3, a fly ash air lift tank 4 and a fly ash silo 5; the outlet of the ash-containing synthesis gas pipeline is connected to the inlet of the fly ash filter 1, the top outlet of the fly ash filter 1 is connected to the clean synthesis gas pipeline, the bottom outlet of the fly ash filter 1 is connected to the inlet of the fly ash storage tank 2, the bottom outlet of the fly ash storage tank 2 is connected to the inlet of the fly ash lock hopper 3, the bottom outlet of the fly ash lock hopper 3 is connected to the inlet of the fly ash air lift tank 4, the bottom outlet of the fly ash air lift tank 4 is connected to the inlet of the fly ash silo 5, and the bottom outlet of the fly ash silo 5 is connected to an external fly ash discharge pipeline; the top outlet of the fly ash lock hopper 3, the top outlet of the fly ash air lift tank 4 and the top outlet of the fly ash silo 5 are connected to the inlet of the exhaust filter 6, and the bottom outlet of the exhaust filter 6 is connected to the inlet of the fly ash silo 5.

[0024] The present invention further comprises a high-pressure nitrogen pipeline, wherein the high-pressure nitrogen pipeline is connected to the back-blowing gas inlet of the fly ash lock hopper 3 .

[0025] The present invention further comprises a low-pressure nitrogen pipeline, wherein the low-pressure nitrogen pipeline is connected to the back-blowing gas inlet of the fly ash lift tank 4 .

[0026] The present invention further comprises a back-flushing nitrogen pipeline, wherein the back-flushing nitrogen pipeline is connected to the back-flushing gas inlet of the exhaust filter 6, and a back-flushing nitrogen buffer tank 7 is arranged on the back-flushing nitrogen pipeline.

[0027] The side of the fly ash storage tank 2 is connected to the side of the fly ash lock hopper 3.

[0028] A first valve is provided on the high-pressure nitrogen pipeline; a second valve is provided on the low-pressure nitrogen pipeline; a third valve is provided on the backflush nitrogen pipeline; and a fourth valve is provided at the bottom outlet of the fly ash silo 5 .

[0029] The specific working process of the present invention is:

[0030] The ash-containing synthesis gas enters the fly ash filter 1 for dust removal, wherein the clean synthesis gas output by the fly ash filter 1 is discharged, the fly ash particles output from the bottom of the fly ash filter 1 enter the fly ash storage tank 2, the fly ash particles output from the bottom of the fly ash storage tank 2 enter the fly ash lock hopper 3, the fly ash particles output from the bottom of the fly ash lock hopper 3 enter the fly ash air lift tank 4, and the fly ash particles output from the bottom of the fly ash air lift tank 4 enter the fly ash silo 5;

[0031] The gas output from the top of the fly ash lock hopper 3 , the gas output from the fly ash air lift tank 4 and the gas output from the fly ash silo 5 are refluxed into the exhaust filter 6 for filtration and then discharged, wherein the particles output from the exhaust filter 6 enter the fly ash silo 5 .

[0032] After running for a period of time, high-pressure nitrogen is passed into the fly ash lock hopper 3 to pressurize the fly ash lock hopper 3; low-pressure nitrogen is passed into the fly ash air lift tank 4 to pressurize the fly ash air lift tank 4, and back-blowing nitrogen is passed into the exhaust filter 6 to back-blow the exhaust filter 6.

Claims

1. A dry coal powder gasification and ash removal device with a common exhaust filter, characterized in that: It comprises an ash-containing synthesis gas pipeline, a fly ash filter (1), a clean synthesis gas pipeline, a fly ash storage tank (2), a fly ash lock hopper (3), a fly ash gas lift tank (4) and a fly ash silo (5); The outlet of the ash-containing synthesis gas pipeline is connected to the inlet of the fly ash filter (1), the top outlet of the fly ash filter (1) is connected to the clean synthesis gas pipeline, the bottom outlet of the fly ash filter (1) is connected to the inlet of the fly ash storage tank (2), the bottom outlet of the fly ash storage tank (2) is connected to the inlet of the fly ash lock hopper (3), the bottom outlet of the fly ash lock hopper (3) is connected to the inlet of the fly ash air lift tank (4), the bottom outlet of the fly ash air lift tank (4) is connected to the inlet of the fly ash silo (5), and the bottom outlet of the fly ash silo (5) is connected to an external fly ash discharge pipeline; the top outlet of the fly ash lock hopper (3), the top outlet of the fly ash air lift tank (4) and the top outlet of the fly ash silo (5) are connected to the inlet of the exhaust filter (6), and the bottom outlet of the exhaust filter (6) is connected to the inlet of the fly ash silo (5); It also includes a high-pressure nitrogen pipeline, wherein the high-pressure nitrogen pipeline is connected to the backwash gas inlet of the fly ash lock hopper (3); It also comprises a low-pressure nitrogen pipeline, wherein the low-pressure nitrogen pipeline is connected to the backwash gas inlet of the fly ash lift tank (4).

2. The dry coal powder gasification and ash removal device with a common exhaust filter according to claim 1 is characterized in that: It also includes a backflush nitrogen pipeline, wherein the backflush nitrogen pipeline is connected to the backflush gas inlet of the exhaust filter (6).

3. The dry coal powder gasification and ash removal device with a common exhaust filter according to claim 1 is characterized in that: A backflush nitrogen buffer tank (7) is arranged on the backflush nitrogen pipeline.

4. The dry coal powder gasification and ash removal device with a common exhaust filter according to claim 1 is characterized in that: The side of the fly ash storage tank (2) is connected to the side of the fly ash lock hopper (3).

5. The dry coal powder gasification and ash removal device with a common exhaust filter according to claim 1, characterized in that: A first valve is arranged on the high-pressure nitrogen pipeline.

6. The dry coal powder gasification and ash removal device with a common exhaust filter according to claim 5, characterized in that: A second valve is arranged on the low-pressure nitrogen pipeline.

7. The dry coal powder gasification and ash removal device with a common exhaust filter according to claim 6, characterized in that: A third valve is provided on the backflush nitrogen pipeline.

8. The dry coal powder gasification and ash removal device with a common exhaust filter according to claim 7, characterized in that: A fourth valve is provided at the bottom outlet of the fly ash silo (5).

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