A compressor system to prevent interlocked shutdown

Abstract

The utility model belongs to the coal bed gas gathering and distribution technical field, concretely relates to a kind of compressor system for preventing interlock shutdown, for preventing compressor due to high inlet pressure and leading to interlock shutdown failure, including compressor unit, further include: electric valve, pressure transmitter, flow transmitter, PLC control system and data acquisition module;The air inlet of the compressor unit is connected with inlet pipeline, electric valve, pressure transmitter and flow transmitter are provided on the inlet pipeline, the pressure transmitter and flow transmitter are respectively used to measure the pressure and flow on inlet pipeline, the output of the pressure transmitter and flow transmitter is connected with the data acquisition module, the data acquisition module is connected with the PLC control system, the output of the PLC control system is connected with the electric valve control end, for the opening of the electric valve according to the signal sent by data acquisition module Control.

Description

Technical Field

[0001] This utility model belongs to the field of coalbed methane gathering and transportation technology, specifically relating to a compressor system for preventing interlock shutdown, used to prevent the compressor from interlocking shutdown due to high inlet pressure. Background Technology

[0002] Compressors, as important compression equipment, are widely used in the field of coalbed methane gathering and transportation. The structure of compressor equipment is complex, and it may suddenly stop due to reasons such as high inlet pressure, high liquid level in the scrubbing tank, or valve malfunction. When one compressor unit in the station stops, the other compressor units often interlock and stop due to the gradual increase in inlet pressure, resulting in the station's operation being paralyzed and unable to continue processing gas.

[0003] Existing methods to prevent compressors from shutting down due to high intake pressure include: (1) automatically opening the bypass valve of the already shut-down unit; (2) preventing the unit from shutting down by manually closing the intake valve of the other units. These two methods cannot effectively prevent the occurrence of shutdown due to high intake pressure because of factors such as delayed valve action response and poor timeliness and accuracy of manual adjustment of intake valve.

[0004] To address the problem of unnecessary shutdowns caused by large fluctuations in intake pressure and slow response of the control system, and to improve energy efficiency, a compressor system that prevents interlocking shutdowns needs to be proposed to solve the problem of interlocking shutdowns caused by high intake pressure. Utility Model Content

[0005] This invention overcomes the shortcomings of the existing technology and provides a compressor system to prevent interlocking shutdown caused by high inlet pressure in coalbed methane gathering and transportation.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: a compressor system for preventing interlocking shutdown, including a compressor unit, and further including: an electric valve, a pressure transmitter, a flow transmitter, a PLC control system, and a data acquisition module; the air inlet of the compressor unit is connected to an air inlet pipe, and the air inlet pipe is equipped with an electric valve, a pressure transmitter, and a flow transmitter. The pressure transmitter and the flow transmitter are used to measure the pressure and flow rate on the air inlet pipe, respectively. The output terminals of the pressure transmitter and the flow transmitter are connected to the data acquisition module, the data acquisition module is connected to the PLC control system, and the output terminal of the PLC control system is connected to the control terminal of the electric valve, used to control the opening degree of the electric valve according to the signal sent by the data acquisition module.

[0007] The electric valve is an electric ball valve.

[0008] The compressor system for preventing interlock shutdown includes multiple compressor units, each compressor unit having an electric valve, a pressure transmitter, and a flow transmitter installed on its intake pipe.

[0009] The output terminal of the PLC control system is also connected to the control terminal of the compressor unit, and is used to control the speed of the compressor unit.

[0010] The compressor system for preventing interlock shutdown further includes a communication module and a fault diagnosis module. The PLC control system is connected to the fault diagnosis module through the communication module, and sends the measurement data of the pressure transmitter and flow transmitter and the opening data of the electric valve to the fault diagnosis module.

[0011] Compared with the prior art, the present invention has the following advantages: 1. This utility model provides a compressor system to prevent interlocked shutdowns. It uses pressure and flow transmitters to monitor the compressor unit's inlet pressure and flow rate in real time and transmits this data to a PLC control system. The PLC control system uses the compressor unit's inlet pressure and flow rate to interlock control the inlet electric ball valve and the unit's speed. By reducing the valve opening and adjusting the unit's speed, the inlet pressure is lowered, making the compressor unit's inlet pressure more stable. When other units fail and shut down, the number of shutdowns due to inlet pressure fluctuations in the compressor unit equipped with this process device is reduced by more than 90%. This reduces the risk of production interruptions and ensures continuous and stable production.

[0012] 2. This utility model can adjust the intake volume and compressor speed in a timely and accurate manner according to changes in actual working conditions, so that the intake pressure is always kept within a safe and stable range, preventing shutdown due to intake pressure fluctuations, and improving the working efficiency and performance of the compressor.

[0013] 3. This utility model enhances the compressor's adaptability and self-protection capabilities under abnormal operating conditions, reduces the number of abnormal shutdowns of the unit, extends the service life of the equipment, and reduces maintenance costs.

[0014] In summary, this invention can avoid compressor unit interlock shutdown, has a fast response speed, and can greatly reduce unnecessary shutdown accidents caused by intake pressure fluctuations. Attached Figure Description

[0015] Figure 1 A schematic diagram of a compressor system for preventing interlock shutdown is provided for an embodiment of this utility model; Figure 2 A curve showing the relationship between the opening degree of the intake electric valve and the intake pressure in a compressor system for preventing interlock shutdown, provided as an embodiment of this utility model; In the diagram: 1 is a pressure transmitter, 2 is a flow transmitter, 3 is a data acquisition module, 4 is a PLC control system, 5 is an electric valve, 6 is a fault diagnosis module, 7 is a compressor unit, 8 is an inlet pipe, 9 is a communication module, and 10 is an outlet pipe. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0017] like Figure 1 As shown, this utility model embodiment provides a compressor system for preventing interlocking shutdown, including a compressor unit 7, and further including: an electric valve 5, a pressure transmitter 1, a flow transmitter 2, a PLC control system 4, and a data acquisition module 3; the compressor unit 7 has an intake pipe 8 connected to its inlet and an outlet pipe 10 provided at its outlet; the intake pipe 8 is equipped with the electric valve 5, the pressure transmitter 1, and the flow transmitter 2, which are used to measure the pressure and flow rate on the intake pipe 8, respectively; the output terminals of the pressure transmitter 1 and the flow transmitter 2 are connected to the data acquisition module 3; the data acquisition module 3 is connected to the PLC control system 4; and the output terminal of the PLC control system 4 is connected to the control terminal of the electric valve 5, used to control the opening degree of the electric valve 5 according to the signal sent by the data acquisition module 3.

[0018] In this example, the intake pressure and flow rate of compressor unit 7 are collected by the corresponding pressure transmitter 1 and flow transmitter 2. The PLC control system judges the data by the internally set threshold. When the data exceeds the set threshold range, the PLC control system 4 adjusts the valve opening of the intake electric ball valve 5 to reduce the intake pressure of the compressor unit by reducing the valve opening.

[0019] Specifically, in this embodiment, the electric valve 5 is an electric ball valve.

[0020] Furthermore, a compressor system for preventing interlocking shutdown in this embodiment includes multiple compressor units 7. Each compressor unit 7 has an electric valve 5, a pressure transmitter 1, and a flow transmitter 2 installed on its intake pipe 8. The intake pressure and flow rate of each compressor unit 7 are collected by the corresponding pressure transmitter 1 and flow transmitter 2, and then sent to the PLC control system 4 via the data acquisition module 3. The PLC control system 4 judges based on internally set thresholds. When the pressure or flow rate data corresponding to a certain compressor unit exceeds the set threshold range, the PLC control system 4 adjusts the valve opening of the corresponding electric ball valve 5, reducing the intake pressure of that compressor unit by decreasing the valve opening. Therefore, in this embodiment, the PLC control system 4 can control the intake pressure of each compressor unit 7 by adjusting the valve opening, preventing a situation where a compressor unit 7 shuts down due to excessive pressure, leading to a sudden increase in pressure in other compressor units 7 and thus causing interlocking shutdown.

[0021] Furthermore, in this embodiment, the output terminal of the PLC control system 4 is also connected to the control terminal of the compressor unit 7 to control the speed of the compressor unit 7, so as to realize the adjustment of the intake pressure of the compressor unit 7 to reach the threshold range.

[0022] Furthermore, the compressor system for preventing interlock shutdown in this embodiment also includes a communication module 9 and a fault diagnosis module 6. The PLC control system is connected to the fault diagnosis module 6 via the communication module 9, sending the measurement data of the pressure transmitter 1 and flow transmitter 2, and the opening data of the electric valve 5 to the fault diagnosis module 6. The fault diagnosis module 6 can analyze and judge the measurement data of the pressure transmitter 1 and flow transmitter 2, and the opening data of the electric ball valve 5. If a fault is detected, it will issue a continuous alarm and temporarily disconnect the compressor system from the control of the PLC control system.

[0023] Furthermore, in this embodiment, two pressure transmitters 1 can be installed on the air intake pipe 8, one for use and one for backup.

[0024] Specifically, in this embodiment, pressure transmitter 1 and flow transmitter 2 transmit the real-time monitored pressure and flow rate values ​​to data acquisition module 3 at fixed intervals. The data transmission interval is set according to the equipment, typically 1 second or 2 seconds.

[0025] Taking a reciprocating compressor unit with a daily processing capacity of 300,000 cubic meters at a certain plant as an example, the high inlet pressure alarm value is 0.28 MPa, the high inlet pressure shutdown value is 0.3 MPa, the rated inlet pressure is 0.17 MPa, and the low inlet pressure shutdown value is 0.12 MPa. The relationship between the inlet valve opening and the inlet pressure is shown in the following graph. Figure 2As shown, by controlling the valve opening through intake pressure, the compressor unit 7 can be prevented from shutting down due to excessive intake pressure.

[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A compressor system for preventing interlock shutdown, comprising a compressor unit (7), characterized in that, Also includes: The compressor unit (7) is equipped with an electric valve (5), a pressure transmitter (1), a flow transmitter (2), a PLC control system (4), and a data acquisition module (3). The air inlet of the compressor unit (7) is connected to an air inlet pipe (8). An electric valve (5), a pressure transmitter (1), and a flow transmitter (2) are installed on the air inlet pipe (8). The pressure transmitter (1) and the flow transmitter (2) are used to measure the pressure and flow rate on the air inlet pipe (8), respectively. The output ends of the pressure transmitter (1) and the flow transmitter (2) are connected to the data acquisition module (3). The data acquisition module (3) is connected to the PLC control system (4). The output end of the PLC control system (4) is connected to the control end of the electric valve (5) and is used to control the opening degree of the electric valve (5) according to the signal sent by the data acquisition module (3).

2. The compressor system for preventing interlock shutdown according to claim 1, characterized in that, The electric valve (5) is an electric ball valve.

3. The compressor system for preventing interlock shutdown according to claim 1, characterized in that, The compressor unit (7) includes multiple compressor units, and each compressor unit (7) is equipped with an electric valve (5), a pressure transmitter (1) and a flow transmitter (2) on its air intake pipe (8).

4. A compressor system for preventing interlocking shutdown according to claim 1, characterized in that, The output terminal of the PLC control system (4) is also connected to the control terminal of the compressor unit (7) to control the speed of the compressor unit (7).

5. A compressor system for preventing interlock shutdown according to claim 1, characterized in that, It also includes a communication module (9) and a fault diagnosis module (10). The PLC control system is connected to the fault diagnosis module (10) through the communication module (9) and sends the measurement data of the pressure transmitter (1) and the flow transmitter (2) and the opening data of the electric valve (5) to the fault diagnosis module (10).

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