A pressure equalizing device for lock bucket system

Abstract

The present invention discloses a pressure equalizing device for a lock bucket system, comprising a pressurized nitrogen pipeline, a variable pressure lock bucket, a filter and a pressure equalizing system, wherein the exhaust port of the variable pressure lock bucket is connected to the inlet of the filter, the outlet of the filter is connected to the inlet of the pressure equalizing system, the outlet of the pressurized nitrogen pipeline and the outlet of the pressure equalizing system are both connected to the pressurized gas inlet of the variable pressure lock bucket, and the device can realize partial nitrogen recovery and reduce pipeline network fluctuation during pressure relief.

Description

Technical Field

[0001] The invention relates to a pressure equalizing device, in particular to a pressure equalizing device for a lock bucket system. Background Art

[0002] Coal gasification technology is an important way to cleanly utilize coal. In the coal powder and fly ash conveying system of the coal gasification process, the powder is conveyed from low pressure to high pressure through the pressure-changing lock bucket filling and pressure-releasing process. However, a large amount of nitrogen is wasted during the filling and pressure-releasing process, and the nitrogen is heated. The released nitrogen cannot be reused, and the energy consumption is high and uneconomical. Especially for some old plants, due to technical transformation or capacity expansion, the nitrogen consumption will be increased, causing the air separation to operate at overload without margin. At this time, the filling and pressure-releasing process of the lock bucket will cause large pressure fluctuations in the nitrogen pipeline network, thus bringing challenges to the stability of the system. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a pressure equalizing device for a lock bucket system, which can realize partial nitrogen recovery and reduce pipeline fluctuations during pressure relief.

[0004] To achieve the above-mentioned purpose, the pressure equalizing device for the lock bucket system described in the present invention includes a pressurized nitrogen pipeline, a pressure variable lock bucket, a filter and a pressure equalizing system. The exhaust port of the pressure variable lock bucket is connected to the inlet of the filter, the outlet of the filter is connected to the inlet of the pressure equalizing system, and the outlet of the pressurized nitrogen pipeline and the outlet of the pressure equalizing system are both connected to the pressurized gas inlet of the pressure variable lock bucket.

[0005] The pressure equalizing system includes a first pressure equalizing tank, a second pressure equalizing tank and a third pressure equalizing tank, wherein the inlet of the first pressure equalizing tank, the inlet of the second pressure equalizing tank and the inlet of the third pressure equalizing tank are all connected to the outlet of the filter, and the outlet of the first pressure equalizing tank, the outlet of the second pressure equalizing tank and the outlet of the third pressure equalizing tank are all connected to the pressurized gas inlet of the transformer lock bucket.

[0006] A first pressure-equalizing valve is arranged at the inlet of the first pressure-equalizing tank.

[0007] A second pressure-equalizing valve is provided at the inlet of the second pressure-equalizing tank.

[0008] A third pressure-equalizing valve is provided at the inlet of the third pressure-equalizing tank.

[0009] A first pressure equalizing valve is arranged at the outlet of the first pressure equalizing tank.

[0010] A second pressure equalizing valve is provided at the outlet of the second pressure equalizing tank.

[0011] A third pressure equalizing valve is provided at the outlet of the third pressure equalizing tank.

[0012] It also includes a venting pipeline, wherein the venting pipeline is connected to the outlet of the filter and a venting valve is arranged on the venting pipeline.

[0013] A main pressure relief valve is arranged between the exhaust port of the transformer lock bucket and the inlet of the filter.

[0014] A pressure charging valve is provided on the pressurized nitrogen pipeline.

[0015] The present invention has the following beneficial effects:

[0016] During specific operation of the pressure equalizing device for the lock bucket system described in the present invention, when the pressure-changing lock bucket is relieving pressure, the released nitrogen is sent to the pressure equalizing system for recovery. Then, when the pressure-changing lock bucket is pressurized, the recovered pressurized nitrogen is first used to charge the pressure-changing lock bucket, and then the pressurized nitrogen pipeline is used for pressurization. Completing one pressure charging and pressure relief can save 30% of nitrogen consumption, thereby realizing partial recovery of nitrogen and reducing pipeline fluctuations during pressure relief. The structure is simple, the operation is convenient, and the practicability is extremely strong. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention.

[0018] Among them, 1 is the transformer lock bucket, 2 is the filter, 3 is the first pressure equalizing tank, 4 is the second pressure equalizing tank, 5 is the third pressure equalizing tank, 6 is the first pressure-reducing valve, 7 is the second pressure-reducing valve, 8 is the third pressure-reducing valve, 9 is the vent valve, 10 is the first pressure-raising valve, 11 is the second pressure-raising valve, 12 is the third pressure-raising valve, 13 is the main pressure relief valve, and 14 is the pressure charging valve. DETAILED DESCRIPTION

[0019] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0020] refer to Figure 1 The pressure equalizing device for the lock bucket system described in the present invention includes a pressurized nitrogen pipeline, a pressure-changing lock bucket 1, a filter 2 and a pressure equalizing system. The exhaust port of the pressure-changing lock bucket 1 is connected to the inlet of the filter 2, the outlet of the filter 2 is connected to the inlet of the pressure equalizing system, and the outlet of the pressurized nitrogen pipeline and the outlet of the pressure equalizing system are both connected to the pressurized gas inlet of the pressure-changing lock bucket 1.

[0021] Specifically, the pressure equalizing system includes a first pressure equalizing tank 3, a second pressure equalizing tank 4 and a third pressure equalizing tank 5, wherein the inlet of the first pressure equalizing tank 3, the inlet of the second pressure equalizing tank 4 and the inlet of the third pressure equalizing tank 5 are all connected to the outlet of the filter 2, and the outlet of the first pressure equalizing tank 3, the outlet of the second pressure equalizing tank 4 and the outlet of the third pressure equalizing tank 5 are all connected to the pressurized gas inlet of the transformer lock bucket 1.

[0022] Furthermore, a first pressure-equalizing valve 6 is provided at the inlet of the first pressure-equalizing tank 3; a second pressure-equalizing valve 7 is provided at the inlet of the second pressure-equalizing tank 4; and a third pressure-equalizing valve 8 is provided at the inlet of the third pressure-equalizing tank 5. During the pressure relief process, the first pressure-equalizing valve 6, the second pressure-equalizing valve 7 and the third pressure-equalizing valve 8 are used to control whether the first pressure-equalizing tank 3, the second pressure-equalizing tank 4 and the third pressure-equalizing tank 5 are filled with nitrogen.

[0023] A first equalizing valve 10 is provided at the outlet of the first pressure equalizing tank 3; a second equalizing valve 11 is provided at the outlet of the second pressure equalizing tank 4; a third equalizing valve 12 is provided at the outlet of the third pressure equalizing tank 5. During the charging process, the first equalizing valve 10, the second equalizing valve 11 and the third equalizing valve 12 are used to control whether the first pressure equalizing tank 3, the second pressure equalizing tank 4 and the third pressure equalizing tank 5 are filled with nitrogen into the transformer lock bucket 1.

[0024] Furthermore, the present invention also includes a venting pipe, wherein the venting pipe is connected to the outlet of the filter 2, and a venting valve 9 is provided on the venting pipe. When the third pressure equalizing tank 5 completes the three equalizing reductions in the lock bucket, the third equalizing reduction valve 8 is closed, and the venting valve 9 is opened to vent the nitrogen in the transformer lock bucket 1.

[0025] Furthermore, a main pressure relief valve 13 is provided between the exhaust port of the pressure-changing lock bucket 1 and the inlet of the filter 2 .

[0026] Furthermore, a pressure charging valve 14 is provided on the pressurized nitrogen pipeline. During the pressure charging process, when the first pressure equalizing tank 3 completes the pressure charging of the pressure-changing lock bucket 1, the pressure charging valve 14 is opened to pressurize the pressure-changing lock bucket 1 to a preset pressure.

[0027] The volumes of the first pressure-equalizing tank 3, the second pressure-equalizing tank 4 and the third pressure-equalizing tank 5 are the same as that of the pressure-changing lock hopper 1. When the pressure-changing lock hopper 1 is depressurized, the released nitrogen is sent to the first pressure-equalizing tank 3, the second pressure-equalizing tank 4 and the third pressure-equalizing tank 5 for recovery. Then, when the pressure-changing lock hopper 1 is pressurized, the recovered pressurized nitrogen is used to charge the pressure-changing lock hopper 1. Completing one pressure-charging and depressurizing operation can save 30% of the nitrogen consumption.

[0028] The working principle of the present invention is:

[0029] When the pressure-changing lock hopper 1 is depressurized, the vented gas first passes through the filter 2 to filter out the powder, then enters the first pressure-equalizing tank 3 to reduce the pressure of the pressure-changing lock hopper 1 to 1 / 2P, then enters the second pressure-equalizing tank 4 to reduce the pressure to 1 / 4P, then enters the third pressure-equalizing tank 5 to reduce the pressure to 1 / 8P, and finally releases the remaining 1 / 8P of pressure to 0. At this time, the pressures of the first pressure-equalizing tank 3, the second pressure-equalizing tank 4 and the third pressure-equalizing tank 5 are 1 / 2, 1 / 4 and 1 / 8 of the original working pressure P of the pressure-changing lock hopper 1, respectively.

[0030] During pressurization, the third pressure equalizing tank 5 first pressurizes the pressure-changing lock bucket 1 to 1 / 16P, and then uses the second pressure equalizing tank 4 to pressurize the pressure-changing lock bucket 1 to [(1 / 16+1 / 4) / 2]P=5 / 32P, and then uses the first pressure equalizing tank 3 to pressurize the pressure-changing lock bucket 1 to [(1 / 2+5 / 32) / 2]P=21 / 64P=0.3282P, and finally nitrogen is supplemented from the pressurized nitrogen pipeline to pressurize the pressure-changing lock bucket 1 to P, completing a charging and depressurization process can save about 30% of the nitrogen.

Claims

1. A pressure equalization method for a lock bucket system, characterized in that: It comprises a pressurized nitrogen pipeline, a pressure-changing lock bucket (1), a filter (2) and a pressure-equalizing system, wherein the exhaust port of the pressure-changing lock bucket (1) is connected to the inlet of the filter (2), the outlet of the filter (2) is connected to the inlet of the pressure-equalizing system, and the outlet of the pressurized nitrogen pipeline and the outlet of the pressure-equalizing system are both connected to the pressurized gas inlet of the pressure-changing lock bucket (1); The pressure equalizing system comprises a first pressure equalizing tank (3), a second pressure equalizing tank (4) and a third pressure equalizing tank (5), wherein the inlet of the first pressure equalizing tank (3), the inlet of the second pressure equalizing tank (4) and the inlet of the third pressure equalizing tank (5) are all connected to the outlet of the filter (2), and the outlet of the first pressure equalizing tank (3), the outlet of the second pressure equalizing tank (4) and the outlet of the third pressure equalizing tank (5) are all connected to the pressurized gas inlet of the pressure-changing lock bucket (1); When the pressure-changing lock hopper (1) is depressurized, the vented gas first passes through the filter (2) to filter out the powder, then enters the first pressure-equalizing tank (3) to reduce the pressure of the pressure-changing lock hopper (1) to 1 / 2P, then enters the second pressure-equalizing tank (4) to reduce the pressure to 1 / 4P, then enters the third pressure-equalizing tank (5) to reduce the pressure to 1 / 8P, and finally releases the remaining 1 / 8P of pressure to 0. At this time, the pressures of the first pressure-equalizing tank (3), the second pressure-equalizing tank (4) and the third pressure-equalizing tank (5) are 1 / 2, 1 / 4 and 1 / 8 of the original working pressure P of the pressure-changing lock hopper (1), respectively. During the pressure charging, the third pressure equalizing tank (5) firstly pressurizes the pressure-changing lock hopper (1) to 1 / 16P, and then uses the second pressure equalizing tank (4) to pressurize the pressure-changing lock hopper (1) to [(1 / 16+1 / 4) / 2]P=5 / 32P, and then uses the first pressure equalizing tank (3) to pressurize the pressure-changing lock hopper (1) to [(1 / 2+5 / 32) / 2]P=21 / 64P=0.3282P, and finally, nitrogen is added from the pressure-charging nitrogen pipeline to pressurize the pressure-changing lock hopper (1) to P.

2. The pressure equalization method for a lock bucket system according to claim 1, characterized in that: A first pressure-equalizing valve (6) is provided at the inlet of the first pressure-equalizing tank (3).

3. The pressure equalization method for a lock bucket system according to claim 2, characterized in that: A second pressure-equalizing valve (7) is provided at the inlet of the second pressure-equalizing tank (4).

4. The pressure equalization method for a lock bucket system according to claim 3, characterized in that: A third pressure-equalizing valve (8) is provided at the inlet of the third pressure-equalizing tank (5).

5. The pressure equalization method for a lock bucket system according to claim 1, characterized in that: A first pressure equalizing valve (10) is provided at the outlet of the first pressure equalizing tank (3).

6. The pressure equalization method for a lock bucket system according to claim 5, characterized in that: A second pressure equalizing valve (11) is provided at the outlet of the second pressure equalizing tank (4).

7. The pressure equalization method for a lock bucket system according to claim 6, characterized in that: A third pressure equalizing valve (12) is provided at the outlet of the third pressure equalizing tank (5).

8. The pressure equalization method for a lock bucket system according to claim 1, characterized in that: It also includes a venting pipeline, wherein the venting pipeline is connected to the outlet of the filter (2), and a venting valve (9) is provided on the venting pipeline.

9. The pressure equalization method for a lock bucket system according to claim 1, characterized in that: A main pressure relief valve (13) is provided between the exhaust port of the variable pressure lock bucket (1) and the inlet of the filter (2); and a charging valve (14) is provided on the pressurized nitrogen pipeline.

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