Device for shortening emergency disposal time of pump jump stop of low-temperature methanol washing main circulation system

Abstract

The invention relates to the field of safety automation control systems special for low-temperature methanol washing, and discloses a device for shortening emergency disposal time of pump jump stop of a low-temperature methanol washing main circulation system, which comprises a remote liquid level meter, an inlet valve and an inlet filter, the remote liquid level meter, the inlet valve and the inlet filter are sequentially and fixedly connected to an inlet pipeline of the low-temperature methanol washing main circulation system pump. According to the system, through cooperation of the remote liquid level meter, the inlet valve, the inlet filter, the methanol operation pump, the check valve, the outlet valve, the liquid level control valve, the cold shock valve and the methanol standby pump, the problems that a traditional emergency disposal mode depends on manual operation, the emergency disposal time is too long, the system disorder degree is high, the adjustment difficulty is large after system disorder, and the emergency disposal time is too long are solved. The problems that an operator needs to complete field manual operation in a short time, the labor intensity is high, and the risk of misoperation exists are solved through the pump operation signal transmission unit.

Description

Technical Field

[0001] This invention relates to the field of safety automated control systems for low-temperature methanol washing, and in particular to a device for shortening emergency response time when the pump in the main circulation system of low-temperature methanol washing trips. Background Technology

[0002] In the low-temperature methanol washing process, the methanol pump in the main circulation system is the core equipment for maintaining methanol circulation. If the methanol pump suddenly stops, it will cause the methanol circulation to be interrupted, causing system disorder, and may even cause the unit to trip or secondary accidents.

[0003] Traditional emergency response methods rely on manual operation. Operators need to rush to the scene after the pump trips, manually start the backup pump and open its outlet valve, and then the main control system needs to be adjusted to restore the system. The whole process takes more than 40 minutes. This makes the emergency response time too long, resulting in a high degree of disorder in the methanol circulation system, which can easily cause subsequent process fluctuations or system trips. Moreover, the system is difficult to adjust after it is disordered, and it requires a lot of manpower and time to restore normal operation. In addition, operators need to complete on-site manual operations (such as starting the backup pump and opening and closing valves) in a short period of time, which is labor-intensive and carries the risk of operational errors. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a device for shortening the emergency response time for pump tripping in a low-temperature methanol washing main circulation system. This device is an automated device that can shorten the emergency response time for pump tripping, reduce system disorder, and decrease labor intensity.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A device for shortening emergency response time when a pump in a low-temperature methanol wash main circulation system trips includes a remote level gauge, an inlet valve, and an inlet filter, wherein the remote level gauge, inlet valve, and inlet filter are sequentially and fixedly connected to the inlet pipeline of the pump in the low-temperature methanol wash main circulation system. The outlet pipeline of the main circulation system pump is fixedly connected in sequence to a methanol operating pump, a methanol standby pump, a check valve, an outlet valve, and a quench valve. The outlet pipelines of the methanol operating pump and the methanol standby pump are both fixedly connected to the same liquid level control valve. The control terminals of the methanol operating pump, the liquid level control valve, and the methanol standby pump are all fixedly connected to the same pump operating signal transmission unit, which is set to: when the operating signal of the operating methanol operating pump is lost, the liquid level control valve will be immediately interlocked and closed; if the pump inlet liquid level detected by the remote liquid level gauge does not trigger the low interlock at this time, the methanol standby pump will be automatically interlocked and started after a delay of 5 seconds. Furthermore, the pump operation signal transmission unit includes a signal cable and a DCS system. The signal cable transmits the operation signal of the methanol operating pump to the DCS system, which then performs the logic control of interlocking to close the liquid level control valve and starting the methanol standby pump. Furthermore, the liquid level control valve is an automatic control valve with an action response time of no more than 5 seconds, ensuring rapid interlock response; Furthermore, the remote level gauge is a low-temperature methanol-resistant type, used to monitor the pump inlet level in real time and transmit the level signal to the pump operation signal transmission unit to ensure the accuracy and real-time performance of the level signal; Furthermore, the model and specifications of the methanol standby pump are the same as those of the methanol operating pump, and the methanol standby pump and the methanol operating pump can be switched and connected to the main circulation system through pipelines to achieve seamless switching; Furthermore, the signal response time of the pump operation signal transmission unit does not exceed 1 second, ensuring efficient execution of the interlocking logic; Furthermore, the device has low modification costs, requiring only the addition of a pump operation signal transmission unit and optimization of DCS interlocking logic. It is fully compatible with existing equipment and requires no changes to the main pipeline or pump body structure.

[0006] The present invention has the following beneficial effects: In this invention, the use of a remote level gauge, inlet valve, inlet filter, methanol running pump, check valve, outlet valve, level control valve, chill valve, and methanol standby pump in combination alleviates the problem of traditional emergency response methods relying on manual operation. Operators need to rush to the scene after the pump trips, manually start the standby pump and open its outlet valve, and then the main control adjusts and restores the system. The whole process takes more than 40 minutes, which makes the emergency response time too long, resulting in a high degree of disorder in the methanol circulation system, which can easily cause subsequent process fluctuations or system trips. Moreover, the system is difficult to adjust after disorder, and it requires a lot of manpower and time to restore normal operation.

[0007] In this invention, when the methanol pump running in the low-temperature methanol washing main circulation system trips due to a fault, the pump operation signal transmission unit detects the loss of the operation signal in real time through the signal cable and transmits the signal to the DCS system. This alleviates the problem that operators need to complete on-site manual operations (such as starting the backup pump and opening and closing valves) in a short time, which is labor-intensive and poses a risk of operational errors. Attached Figure Description

[0008] Figure 1 This is a structural diagram of the pump operation signal transmission unit of a device for shortening emergency response time in a low-temperature methanol wash main circulation system pump tripping, as proposed in this invention.

[0009] Legend: 1. Remote level gauge; 2. Inlet valve; 3. Inlet filter; 4. Methanol running pump; 5. Check valve; 6. Outlet valve; 7. Level control valve; 8. Cooling valve; 9. Pump operation signal transmission unit; 10. Methanol standby pump. Detailed Implementation

[0010] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0011] Reference Figure 1 The present invention provides an embodiment of a device for shortening emergency response time when a pump in a low-temperature methanol wash main circulation system trips, comprising a remote level gauge 1, an inlet valve 2, and an inlet filter 3, wherein the remote level gauge 1, the inlet valve 2, and the inlet filter 3 are sequentially fixedly connected to the inlet pipeline of the pump in the low-temperature methanol wash main circulation system. The outlet pipeline of the main circulation system pump is fixedly connected in sequence to methanol operating pump 4, methanol standby pump 10, check valve 5, outlet valve 6 and cold start valve 8. The outlet pipelines of methanol operating pump 4 and methanol standby pump 10 are both fixedly connected to the same liquid level control valve 7. The control terminals of methanol operating pump 4, level control valve 7, and methanol standby pump 10 are all fixedly connected to the same pump operation signal transmission unit 9, which is set to: when the operating signal of methanol operating pump 4 is lost, the level control valve 7 will be immediately interlocked and closed; if the pump inlet level detected by the remote level gauge 1 does not trigger the low interlock at this time, the methanol standby pump 10 will be automatically interlocked and started after a delay of 5 seconds; when methanol operating pump 4 in the low temperature methanol washing main circulation system trips due to a fault, the pump operation signal transmission unit 9 will detect the loss of the operating signal in real time through the signal cable and transmit the signal to the DCS system.

[0012] The pump operation signal transmission unit 9 includes a signal cable and a DCS system. The signal cable transmits the operation signal of the methanol operating pump 4 to the DCS system, which then executes the logic control to interlock and close the liquid level control valve 7 and start the methanol standby pump 10.

[0013] The level control valve 7 is an automatic control valve with a response time of no more than 5 seconds, ensuring rapid interlock response.

[0014] The remote level gauge 1 is a low-temperature methanol-resistant type, used to monitor the pump inlet level in real time and transmit the level signal to the pump operation signal transmission unit 9 to ensure the accuracy and real-time performance of the level signal.

[0015] The model and specifications of the methanol standby pump 10 are the same as those of the methanol operating pump 4. The methanol standby pump 10 and the methanol operating pump 4 can be switched and connected to the main circulation system through pipelines to achieve seamless switching. The DCS system immediately triggers the interlock logic. First, the liquid level control valve 7 is interlocked and closed to prevent backflow of the medium or system overload when the standby pump starts. At the same time, the remote liquid level gauge 1 monitors the pump inlet liquid level in real time. If the liquid level does not reach the low interlock threshold, the liquid level is normal and there is no risk of empty pump. The DCS system starts with a 5-second delay.

[0016] After the delay ends, the DCS system automatically interlocks and starts the methanol standby pump 10. The methanol standby pump 10 draws in the medium through the inlet valve 2 and the inlet filter 3, and enters the main circulation system through the check valve 5 and the outlet valve 6, quickly restoring the methanol circulation.

[0017] The signal response time of the pump operation signal transmission unit 9 does not exceed 1 second, ensuring efficient execution of the interlocking logic. After the standby pump is started and running normally, the operator gradually adjusts the opening of the liquid level control valve 7 according to the actual working conditions to complete system optimization, so that the main circulation system can be restored to a stable operating state within about 4 minutes.

[0018] The retrofit cost of this device is low, requiring only the addition of a pump operation signal transmission unit and optimization of the DCS interlocking logic. It is fully compatible with existing equipment and requires no modification to the main pipeline or pump structure.

[0019] Working principle: When the methanol running pump 4, which is running in the low-temperature methanol washing main circulation system, suddenly stops due to electrical fault, mechanical fault or other abnormal reasons, the pump running signal transmission unit 9 collects and identifies the signal loss status of the running pump in real time through a high-response signal cable, and transmits the signal to the distributed control system (DCS) in a very short time (not exceeding 1 second).

[0020] Upon receiving the signal, the DCS system immediately activates the preset interlock control logic. The system first outputs a command to quickly close the liquid level control valve 7. This valve uses a high-speed automatic actuator with a response time controlled within 5 seconds, effectively avoiding medium backflow, sudden changes in system pressure, or load shocks during the startup phase of the standby pump caused by pump stoppage.

[0021] Meanwhile, the remote level gauge 1, which adopts a low-temperature methanol-resistant design, has high accuracy and reliability. It continuously monitors the pump inlet level and feeds back the real-time level signal to the DCS system. If the detection result shows that the inlet level is not lower than the interlock shutdown threshold, it indicates that there is no risk of pumping dry. The DCS automatically enters a 5-second delay state. This delay is designed to ensure that the operating pump stops completely and the system transient process transitions smoothly, creating stable conditions for the standby pump to start.

[0022] After the delay ends, the DCS system issues a start command and automatically interlocks to start the methanol standby pump 10. The standby pump is exactly the same as the main operating pump in terms of specifications and model, and is seamlessly connected to the system through a parallel pipeline design. After the methanol standby pump starts, it draws methanol medium through inlet valve 2 and inlet filter 3, prevents backflow through check valve 5, and finally sends methanol back into the main circulation loop through outlet valve 6, quickly restoring the normal circulation of the system.

[0023] Operators can monitor the operating status of the standby pump in the control system. After it is running normally, the opening of the liquid level control valve 7 can be gradually adjusted according to the actual working conditions to further optimize the system parameters. This allows the main circulation system to return to a stable operating state in a very short time (about 4 minutes), which greatly reduces the system disorder and secondary risks caused by pump tripping.

[0024] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A device for shortening emergency response time in a low-temperature methanol washing main circulation system pump tripping, comprising a remote level gauge (1), an inlet valve (2), and an inlet filter (3), characterized in that: The remote level gauge (1), inlet valve (2), and inlet filter (3) are sequentially fixedly connected to the inlet pipeline of the pump in the low-temperature methanol washing main circulation system. The outlet pipeline of the main circulation system pump is fixedly connected in sequence to a methanol running pump (4), a methanol standby pump (10), a check valve (5), an outlet valve (6), and a cold start valve (8). The outlet pipelines of the methanol running pump (4) and the methanol standby pump (10) are both fixedly connected to the same liquid level control valve (7). The control terminals of the methanol operating pump (4), the liquid level control valve (7), and the methanol standby pump (10) are all fixedly connected to the same pump operation signal transmission unit (9), which is set to: when the operating signal of the operating methanol operating pump (4) is lost, the liquid level control valve (7) will be immediately closed by interlock. If the pump inlet liquid level detected by the remote liquid level gauge (1) does not trigger the low interlock at this time, the methanol standby pump (10) will be automatically started by interlock after a delay of 5 seconds.

2. The device for shortening emergency response time in a low-temperature methanol wash main circulation system pump tripping according to claim 1, characterized in that: The pump operation signal transmission unit (9) includes a signal cable and a DCS system. The signal cable transmits the operation signal of the methanol operation pump (4) to the DCS system, and the DCS system performs the logic control of interlocking to close the liquid level control valve (7) and starting the methanol standby pump (10).

3. The device for shortening emergency response time in a low-temperature methanol wash main circulation system pump tripping according to claim 2, characterized in that: The liquid level control valve (7) is an automatic control valve, and its action response time does not exceed 5 seconds, ensuring rapid interlock response.

4. The device for shortening emergency response time in a low-temperature methanol wash main circulation system pump tripping according to claim 3, characterized in that: The remote level gauge (1) is a low-temperature methanol-resistant type, used to monitor the pump inlet level in real time and transmit the level signal to the pump operation signal transmission unit (9) to ensure the accuracy and real-time performance of the level signal.

5. The device for shortening emergency response time in a low-temperature methanol wash main circulation system pump tripping according to claim 4, characterized in that: The model and specifications of the methanol standby pump (10) are the same as those of the methanol operating pump (4). The methanol standby pump (10) and the methanol operating pump (4) are connected to the main circulation system through pipelines to achieve seamless switching.

6. The device for shortening emergency response time in a low-temperature methanol wash main circulation system pump tripping according to claim 5, characterized in that: The signal response time of the pump operation signal transmission unit (9) does not exceed 1 second, ensuring efficient execution of the interlocking logic.

7. The device for shortening emergency response time in a low-temperature methanol wash main circulation system pump tripping according to claim 6, characterized in that: The retrofit cost of this device is low, requiring only the addition of a pump operation signal transmission unit and optimization of the DCS interlocking logic. It is fully compatible with existing equipment and requires no modification to the main pipeline or pump structure.

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