A process change emergency processing system and control method

Abstract

The invention discloses an emergency treatment system and control method for a conversion process: comprising a gas separator, the inlet of the gas separator is connected to a gas pipeline, a gas boundary manual valve, a gas regulating valve, and a gas online pressure gauge are sequentially installed on the gas pipeline, the gas pipeline between the gas regulating valve and the gas online pressure gauge is connected to a medium-pressure nitrogen pipeline, a medium-pressure nitrogen front manual valve, a medium-pressure nitrogen online pressure gauge, a nitrogen cut-off valve, a nitrogen regulating valve, and a medium-pressure nitrogen rear manual valve are sequentially installed on the medium-pressure nitrogen pipeline; the outlet of the gas separator is connected to a carbon monoxide conversion system, the outlet of the carbon monoxide conversion system is connected to a conversion venting pipeline, and a conversion system online pressure gauge and a conversion venting valve are installed on the conversion venting pipeline. The invention can automatically cut off gas and replace the system, thereby ensuring the personal safety of operators and the safety of production equipment.

Description

Technical Field

[0001] The present invention relates to the field of chemical production, and more specifically, to an emergency processing system and a control method for changing a process. Background Art

[0002] The conversion process is often used as a high-temperature reaction device in the coal-to-gas process. Since the coal gas contains a large amount of H2S, CO2, H2 and other substances, the pipeline is prone to corrosion. In addition, the medium-pressure steam in the whole plant fluctuates greatly, and the operation of the coal gasification device is unstable, the gas volume fluctuates greatly, and the temperature of the conversion furnace fluctuates greatly, which makes the thermal stress of the flange, bolts, and pipelines change greatly. The risk of leakage on site is very high, making the conversion process the most prone to leakage. The conversion process often uses a manual valve switch at the boundary area, and the operator needs to go to the site to perform the switch action when starting and stopping. If there is an abnormal situation in the conversion, the operator needs to go to the site to close the boundary valve, which poses a great threat to personal safety during the gas cutting process. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies in the prior art and to propose an emergency processing system and control method for changing the process, which can automatically cut off the gas and replace the system, thereby ensuring the personal safety of the operator and the safety of the production equipment.

[0004] The purpose of the present invention can be achieved through the following technical solutions.

[0005] The emergency treatment system for the conversion process of the present invention comprises a gas separator, the inlet of the gas separator is connected to a gas pipeline, a gas boundary manual valve, a gas regulating valve, and a gas online pressure gauge are sequentially installed on the gas pipeline along the material conveying direction, the gas pipeline between the gas regulating valve and the gas online pressure gauge is connected to a medium-pressure nitrogen pipeline, a medium-pressure nitrogen front manual valve, a medium-pressure nitrogen online pressure gauge, a nitrogen cut-off valve, a nitrogen regulating valve, and a medium-pressure nitrogen rear manual valve are sequentially installed on the medium-pressure nitrogen pipeline along the material conveying direction, and the gas online pressure gauge controls the nitrogen regulating valve;

[0006] The outlet of the coal gas separator is connected to the carbon monoxide conversion system through a pipeline, and the outlet of the carbon monoxide conversion system is connected to the conversion vent pipeline. A conversion system online pressure gauge and a conversion vent valve are installed in sequence on the conversion vent pipeline along the material conveying direction. The conversion system online pressure gauge controls the conversion vent valve.

[0007] The medium-pressure nitrogen pipeline between the nitrogen cut-off valve and the nitrogen regulating valve is connected to a nitrogen venting pipeline, and a venting cut-off valve is installed on the nitrogen venting pipeline.

[0008] The purpose of the present invention can also be achieved through the following technical solutions.

[0009] The control method of the emergency processing system for the conversion process of the present invention includes the following steps:

[0010] Under normal working conditions, the gas boundary manual valve, the medium-pressure nitrogen front manual valve, the medium-pressure nitrogen rear manual valve and the gas regulating valve are all in the open state, the nitrogen cut-off valve and the nitrogen regulating valve are in the closed state, and the vent cut-off valve is open. At the same time, when the pressure of the medium-pressure nitrogen online pressure gauge is lower than the conversion system online pressure gauge, the nitrogen regulating valve cannot be opened;

[0011] When an abnormal situation occurs in the conversion process, the operator immediately presses the emergency processing button installed on the operating table, the gas regulating valve is immediately closed, and the online pressure gauge of the conversion system controls the conversion vent valve to reduce the pressure at a certain pressure reduction rate. When the online pressure gauge of the conversion system reduces the pressure to 0.1MPa, the conversion vent valve is controlled to maintain the pressure at 0.1MPa, and the nitrogen regulating valve is gradually opened. When the opening of the nitrogen regulating valve is greater than 1%, the nitrogen cut-off valve automatically opens. When the nitrogen cut-off valve is fully opened, the vent cut-off valve automatically closes. At this time, the online gas pressure gauge controls the nitrogen regulating valve and maintains the set pressure. After the medium-pressure nitrogen enters the conversion system, it is vented from the conversion vent valve to achieve the purpose of nitrogen replacement in the carbon monoxide conversion system.

[0012] When the carbon monoxide conversion system is replaced and qualified, reset the emergency processing button and close the nitrogen regulating valve. When the opening of the nitrogen regulating valve is less than or equal to 1%, the nitrogen cut-off valve is automatically closed. When the nitrogen cut-off valve is closed in place, the vent cut-off valve is automatically opened, and the conversion system online pressure gauge controls the conversion vent valve to maintain a pressure of 0.1MPa.

[0013] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0014] (1) The present invention adds a gas regulating valve behind the gas boundary manual valve. If an abnormal situation occurs, the gas can be cut off urgently, thereby ensuring the personal safety of the operator and the safety of the production equipment.

[0015] (2) The present invention connects a medium-pressure nitrogen pipeline to the coal gas pipeline, and installs a nitrogen shut-off valve and a nitrogen regulating valve on the medium-pressure nitrogen pipeline. In the event of an abnormal situation, nitrogen can be replaced in the conversion system through the nitrogen pipeline, and a vent shut-off valve is installed between the two valves to prevent the coal gas in the coal gas pipeline from flowing back to the medium-pressure nitrogen main pipe during normal production and contaminating the medium-pressure nitrogen.

[0016] (3) The present invention installs an emergency processing button on the operating table, which enables the operator to quickly handle abnormal situations and prevent more serious consequences caused by untimely processing due to subjective factors. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a process flow diagram of the emergency treatment system for the conversion process of the present invention.

[0018] Figure 2 It is a schematic diagram of the control method of the emergency processing system for the conversion process of the present invention.

[0019] Figure markings: V1 gas boundary manual valve, V2 medium pressure nitrogen front manual valve, V3 medium pressure nitrogen rear manual valve, HV1 gas regulating valve, HV2 nitrogen regulating valve, HV3 conversion vent valve, XV1 nitrogen cut-off valve, XV2 vent cut-off valve, 1 gas pipeline, 2 medium pressure nitrogen pipeline, 3 carbon monoxide conversion system, 4 conversion vent pipeline, 5 nitrogen vent pipeline, S01 gas separator, P1 gas online pressure gauge, P2 conversion system online pressure gauge, P3 medium pressure nitrogen online pressure gauge. DETAILED DESCRIPTION

[0020] The present invention will be further described below in conjunction with the accompanying drawings.

[0021] like Figure 1 As shown, the emergency treatment system for the conversion process includes a gas separator S01, the inlet of the gas separator S01 is connected to a gas pipeline 1, and the gas pipeline 1 is sequentially installed with a gas boundary hand valve V1, a gas regulating valve HV1, and a gas online pressure gauge P1 along the material conveying direction. The gas pipeline 1 between the gas regulating valve HV1 and the gas online pressure gauge P1 is connected to a medium-pressure nitrogen pipeline 2, and the medium-pressure nitrogen front hand valve V2, the medium-pressure nitrogen online pressure gauge P3, the nitrogen cut-off valve XV1, the nitrogen regulating valve HV2, and the medium-pressure nitrogen rear hand valve V3 are sequentially installed along the material conveying direction on the medium-pressure nitrogen pipeline 2. The gas online pressure gauge P1 controls the nitrogen regulating valve HV2. The medium-pressure nitrogen pipeline 2 between the nitrogen cut-off valve XV1 and the nitrogen regulating valve HV2 is connected to a nitrogen venting pipeline 5, and a venting cut-off valve XV2 is installed on the nitrogen venting pipeline 5.

[0022] The outlet of the coal gas separator S01 is connected to the carbon monoxide conversion system 3 through a pipeline, and the outlet of the carbon monoxide conversion system 3 is connected to the conversion vent pipeline 4. On the conversion vent pipeline 4, a conversion system online pressure gauge P2 and a conversion vent valve HV3 are installed in sequence along the material conveying direction. The conversion system online pressure gauge P2 controls the conversion vent valve HV3.

[0023] The nitrogen cut-off valve XV1, the nitrogen regulating valve HV2 and the vent cut-off valve XV2 are cascade controlled, that is, when the opening of the nitrogen regulating valve HV2 is greater than 1%, the nitrogen cut-off valve XV1 automatically opens, and when the nitrogen cut-off valve XV1 is fully opened, the vent cut-off valve XV2 automatically closes; similarly, when the opening of the nitrogen regulating valve HV2 is less than or equal to 1%, the nitrogen cut-off valve XV1 automatically closes, and when the nitrogen cut-off valve XV1 is fully closed, the vent cut-off valve XV2 automatically opens, to prevent the cut-off valve XV1 and the nitrogen regulating valve HV2 from being loose, causing coal gas to enter the medium-pressure nitrogen and pollute the medium-pressure nitrogen.

[0024] Install an emergency button on the operating console.

[0025] The control method of the emergency processing system for the conversion process of the present invention is as follows: Figure 2 As shown, the specific process is as follows:

[0026] Under normal operating conditions, the gas boundary manual valve V1, the medium-pressure nitrogen front manual valve V2, the medium-pressure nitrogen rear manual valve V3 and the gas regulating valve HV1 are all in the open state. Since the gas pressure is higher than the medium-pressure nitrogen pressure, the nitrogen cut-off valve XV1 and the nitrogen regulating valve HV2 are in the closed state, and the vent cut-off valve XV2 is open. At the same time, when the pressure of the medium-pressure nitrogen online pressure gauge P3 is lower than the conversion system online pressure gauge P2, the nitrogen regulating valve HV2 cannot be opened to prevent the gas from entering the medium-pressure nitrogen pipeline and causing medium-pressure nitrogen pollution.

[0027] When abnormal conditions such as leakage or fire occur in the conversion process, the operator can immediately press the emergency button installed on the operating table, and the gas regulating valve HV1 will be immediately closed. The conversion system online pressure gauge P2 controls the conversion vent valve HV3 to reduce the pressure at a certain pressure reduction rate (the pressure reduction rate can be set according to actual conditions, such as 0.3-0.8MPa / min). When the conversion system online pressure gauge P2 reduces the pressure to 0.1MPa, the conversion vent valve HV3 is controlled to maintain the pressure at 0.1MPa and gradually open. Open the nitrogen regulating valve HV2. When the opening of the nitrogen regulating valve HV2 is greater than 1%, the nitrogen cut-off valve XV1 automatically opens. When the nitrogen cut-off valve XV1 is fully opened, the vent cut-off valve XV2 automatically closes. At this time, the gas online pressure gauge P1 controls the nitrogen regulating valve HV2 and maintains the pressure at the set value (the set value is set according to the actual situation, such as 0.1-0.3MPa). After the medium-pressure nitrogen enters the conversion system, it is vented from the conversion vent valve HV3 to achieve the purpose of nitrogen replacement in the carbon monoxide conversion system 3.

[0028] When the carbon monoxide conversion system 3 is replaced and qualified, reset the emergency processing button and close the nitrogen regulating valve HV2. When the opening of the nitrogen regulating valve HV2 is less than or equal to 1%, the nitrogen cut-off valve XV1 is automatically closed. When the nitrogen cut-off valve XV1 is closed in place, the vent cut-off valve XV2 is automatically opened, and the conversion system online pressure gauge P2 maintains the pressure at 0.1Mpa by controlling the conversion vent valve HV3.

[0029] Although the functions and working processes of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the above-mentioned specific functions and working processes. The above-mentioned specific implementation methods are merely illustrative rather than restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the purpose of the present invention and the claims, which are all within the protection of the present invention.

Claims

1. A control method for a change process emergency processing system, characterized in that: The conversion process emergency treatment system comprises a gas separator (S01), the inlet of the gas separator (S01) is connected to a gas pipeline (1), a gas boundary manual valve (V1), a gas regulating valve (HV1), and a gas online pressure gauge (P1) are sequentially installed on the gas pipeline (1) along the material conveying direction, the gas pipeline (1) between the gas regulating valve (HV1) and the gas online pressure gauge (P1) is connected to a medium-pressure nitrogen pipeline (2), and the medium-pressure nitrogen pipeline (2) is connected to the material conveying direction. A medium-pressure nitrogen front hand valve (V2), a medium-pressure nitrogen online pressure gauge (P3), a nitrogen shut-off valve (XV1), a nitrogen regulating valve (HV2), and a medium-pressure nitrogen rear hand valve (V3) are sequentially installed in the material conveying direction, and the coal gas online pressure gauge (P1) controls the nitrogen regulating valve (HV2); the medium-pressure nitrogen pipeline (2) between the nitrogen shut-off valve (XV1) and the nitrogen regulating valve (HV2) is connected to a nitrogen venting pipeline (5), and a venting shut-off valve (XV2) is installed on the nitrogen venting pipeline (5); The outlet of the coal gas separator (S01) is connected to a carbon monoxide conversion system (3) via a pipeline, and the outlet of the carbon monoxide conversion system (3) is connected to a conversion venting pipeline (4), on which a conversion system online pressure gauge (P2) and a conversion venting valve (HV3) are sequentially installed along a material conveying direction, and the conversion system online pressure gauge (P2) controls the conversion venting valve (HV3); The control method specifically includes the following processes: Under normal operating conditions, the gas boundary manual valve (V1), the medium-pressure nitrogen front manual valve (V2), the medium-pressure nitrogen rear manual valve (V3) and the gas regulating valve (HV1) are all in the open state, the nitrogen cut-off valve (XV1) and the nitrogen regulating valve (HV2) are in the closed state, the vent cut-off valve (XV2) is open, and when the pressure of the medium-pressure nitrogen online pressure gauge (P3) is lower than the conversion system online pressure gauge (P2), the nitrogen regulating valve (HV2) cannot be opened; When an abnormal situation occurs in the conversion process, the operator immediately presses the emergency processing button installed on the operating table, and the gas regulating valve (HV1) is immediately closed. The conversion system online pressure gauge (P2) controls the conversion vent valve (HV3) to reduce the pressure at a certain pressure reduction rate. When the conversion system online pressure gauge (P2) reduces the pressure to 0.1MPa, the conversion vent valve (HV3) is controlled to maintain the pressure at 0.1MPa, and the nitrogen regulating valve (HV2) is gradually opened. When the opening of the nitrogen regulating valve (HV2) is greater than 1%, the nitrogen cut-off valve (XV1) automatically opens. When the nitrogen cut-off valve (XV1) opens to the full position, the vent cut-off valve (XV2) automatically closes. At this time, the gas online pressure gauge (P1) controls the nitrogen regulating valve (HV2) and maintains the set pressure. After the medium-pressure nitrogen enters the conversion system, it is vented from the conversion vent valve (HV3), achieving the purpose of nitrogen replacement in the carbon monoxide conversion system (3); When the carbon monoxide conversion system (3) is replaced and qualified, the emergency processing button is reset and the nitrogen regulating valve (HV2) is closed. When the opening of the nitrogen regulating valve (HV2) is less than or equal to 1%, the nitrogen shut-off valve (XV1) is automatically closed. When the nitrogen shut-off valve (XV1) is closed, the vent shut-off valve (XV2) is automatically opened, and the conversion system online pressure gauge (P2) controls the conversion vent valve (HV3) to maintain a pressure of 0.1MPa.

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