Pressure cooperative control system for gas differential pressure power generation system

Abstract

The invention discloses a pressure cooperative control system for a gas differential pressure power generation system. The pressure cooperative control system comprises a cooperative controller (8), a cooperative control valve (3), a second pressure sensor (12) and a first pressure sensor (11). A cooperative control program is arranged in the cooperative controller, the cooperative controller executes the cooperative control program, and the control functions capable of being achieved comprise the following steps: according to a differential pressure power generation branch outlet pressure data signal collected by the second pressure sensor and a downstream pipe network pressure data signal collected by the first pressure sensor, the differential pressure power generation branch outlet pressure data signal collected by the second pressure sensor; the cooperative control valve is controlled to be opened and closed so as to control starting and stopping of the gas differential pressure power generation system. In this way, the gas main pipeline alarm caused by small-flow operation of differential pressure power generation on the main station pressure regulator can be avoided, and then the gas use safety of a downstream pipe network is guaranteed.

Description

Technical Field

[0001] This invention relates to an automated control technology for a gas differential pressure power generation system, and more particularly to a pressure coordination control system for a gas differential pressure power generation system. Background Technology

[0002] Currently, the differential pressure power generation system in gas pressure regulating stations has significant technical deficiencies in terms of pressure control.

[0003] Since the low-pressure differential power generation system is a branch connected in parallel to the main voltage regulator of the voltage regulating station, the outlet pressure of the differential power generation system has a primary and secondary relationship with the outlet pressure of the main voltage regulator, and they influence each other.

[0004] When a branch of the differential pressure power generation system is put into operation, there is a differential pressure power generation regulator on the branch. According to the characteristics of the regulator, the reduced flow in the branch will lead to an increase in the branch outlet pressure, which in turn will lead to an increase in the pressure of the downstream pipeline network.

[0005] When a differential pressure power generation system is deployed in a voltage regulating station with a low alarm pressure threshold, if the differential pressure power generation is forced to reach the power generation capacity, the outlet pressure of the branch circuit may easily exceed the safe operating threshold of the main voltage regulator.

[0006] The main problem at present is:

[0007] Maintaining stable downstream pipeline pressure and maintaining differential power generation lead to increased export pressure, which are currently contradictory and cannot be reconciled. Summary of the Invention

[0008] The purpose of this invention is to provide a pressure coordination control system for a gas differential pressure power generation system. This pressure coordination control system can control the start and stop of the gas differential pressure power generation system based on the collected pipeline pressure data signals, thereby ensuring the safety of gas supply in the downstream pipeline network.

[0009] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution:

[0010] A pressure coordination control system for a gas-fired differential pressure power generation system, wherein the gas-fired differential pressure power generation system is connected in parallel with the main station pressure regulator;

[0011] The pressure coordination control system includes a coordination controller, a coordination control valve, a second pressure sensor, and a first pressure sensor;

[0012] The coordinated control valve is installed on the differential pressure power generation gas branch pipeline of the gas differential pressure power generation system, and is located at the inlet of the differential pressure power generation gas branch pipeline;

[0013] The second pressure sensor is arranged on the differential pressure power generation gas branch pipeline of the gas differential pressure power generation system and is located on the downstream side of the differential pressure generator;

[0014] The first pressure sensor is arranged on the main gas pipeline and is located on the downstream side of the differential pressure power generation gas return point;

[0015] A cooperative control program is set in the cooperative controller. When the cooperative controller executes the cooperative control program, the control functions that can be achieved include:

[0016] According to the differential pressure power generation branch outlet pressure data signal collected by the second pressure sensor and the downstream pipe network pressure data signal collected by the first pressure sensor, control the opening and closing of the cooperative control valve to control the start and stop of the gas differential pressure power generation system.

[0017] Further, set P1 to represent the downstream pipe network pressure and set P2 to represent the differential pressure power generation branch outlet pressure;

[0018] The cooperative control program specifically includes:

[0019] Preset a pressure warning threshold P3 in advance;

[0020] Taking 30 minutes as a sampling period, sample the differential pressure power generation branch outlet pressure and the downstream pipe network pressure every other sampling period.

[0021] When both P1 < P3 and P2 are higher than the outlet pressure set value of the main station regulator and lower than the relief pressure of the pressure regulating station are satisfied simultaneously, control to open the cooperative control valve to make the gas differential pressure power generation system operate for power generation;

[0022] During the operation of the system, continuously monitor P1 and P2. When the condition of P1 < P3 is continuously satisfied and P2 is maintained within the safe power generation range, the system continues to operate. If P1 >= P3 or P2 deviates from the safe power generation range, control to close the cooperative control valve to make the gas differential pressure power generation system stop operating.

[0023] Further, the cooperative controller includes an MCU control unit, a battery pack, a voltage stabilizing circuit, an RS485 circuit, a generator voltage sampling unit, a FLASH unit, a valve driving circuit and a 4G communication module.

[0024] Further, the cooperative controller is placed in an explosion-proof box.

[0025] Further, an MPPT is arranged in the explosion-proof box.

[0026] Further, the cooperative control valve is an electric ball valve.

[0027] The main advantages of the pressure coordination control system for gas-fired differential pressure power generation systems of the present invention compared with the prior art are as follows:

[0028] By executing the collaborative control program, the collaborative control valve is opened and closed based on the collected pipeline pressure data signal, thereby controlling the start and stop of the gas differential pressure power generation system. This avoids the gas main pipeline alarm caused by the differential pressure power generation operating at a low flow rate in the main station pressure regulator, thus ensuring the safety of gas use in the downstream pipeline network. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the pressure coordination control system for a gas-fired differential pressure power generation system according to the present invention. The diagram shows the parallel installation of the pressure coordination control system in the pressure regulating station, reflecting the connection relationship between the branch and the main line.

[0030] Figure 2 This is a schematic diagram of the collaborative controller used in the pressure collaborative control system of the present invention;

[0031] Figure 3 This is a flowchart of the collaborative control program executed by the collaborative controller used in the pressure collaborative control system of the present invention. Detailed Implementation

[0032] The following provides further details on specific embodiments of the present invention:

[0033] Let me first introduce the existing gas differential pressure power generation system. The existing gas differential pressure power generation system includes a differential pressure power generation gas branch pipeline. A differential pressure generator 5 is installed on the differential pressure power generation gas branch pipeline. A pressure regulator is installed on the upstream side of the differential pressure generator 5 as a differential pressure power generation pressure regulator 4. A shut-off valve is installed on the downstream side of the differential pressure generator 5.

[0034] The upstream and downstream ports of the differential pressure power generation gas branch pipeline are both connected to the main gas pipeline via manual valves. The upstream port of the differential pressure power generation gas branch pipeline is connected to the upstream side of the main station pressure regulator, and the downstream port of the differential pressure power generation gas branch pipeline is connected to the downstream side of the main station pressure regulator. In other words, the gas differential pressure power generation system and the main station pressure regulator are connected in parallel.

[0035] In view of the existing gas pressure differential power generation system, this embodiment provides a pressure coordination control system that can control the start and stop of the gas pressure differential power generation system based on the collected pipeline pressure data signal.

[0036] See Figure 1 The pressure coordination control system in this embodiment is based on an existing gas pressure differential power generation system. The pressure coordination control system includes a coordination controller 8, a coordination control valve 3, a second pressure sensor 12, and a first pressure sensor 11.

[0037] The coordinated control valve 3 is an electric ball valve. It is installed on the differential pressure power generation gas branch pipeline of the gas differential pressure power generation system and is located upstream of the differential pressure power generation regulator 4. In essence, it is the inlet of the entire differential pressure power generation gas branch pipeline.

[0038] The coordinated control valve 3 is connected to the coordinated controller 8 via a communication line, and is controlled by the coordinated controller 8. The coordinated control valve 3 is used to control the flow of gas from the main gas pipeline through the differential pressure power generation gas branch pipeline of the gas differential pressure power generation system, which is essentially controlling the start and stop of the gas differential pressure power generation system.

[0039] The second pressure sensor 12 is installed on the differential pressure power generation gas branch line of the gas differential pressure power generation system and is located downstream of the differential pressure generator 5.

[0040] The second pressure sensor 12 is connected to the co-controller 8 via a communication line. The second pressure sensor 12 is used to monitor and collect the gas pressure data of the gas in the pipeline downstream of the differential pressure generator 5, and transmit the collected gas pressure data signal to the co-controller 8.

[0041] For ease of description, the air pressure data collected by the second pressure sensor 12 is defined as "differential pressure power generation branch outlet pressure", denoted by P2.

[0042] The first pressure sensor 11 is installed on the main gas pipeline and is located downstream of the differential pressure power generation return point.

[0043] The first pressure sensor 11 is connected to the collaborative controller 8 via a communication line. The first pressure sensor 11 is used to monitor and collect the gas pressure data of the gas in the pipeline downstream of the differential pressure power generation return point, and transmit the collected gas pressure data to the collaborative controller 8.

[0044] For ease of description, the air pressure data collected by the first pressure sensor 11 is defined as "downstream pipeline pressure", denoted by P1.

[0045] It should be noted that the "differential pressure power generation return point" mentioned in this embodiment refers to the point where the "downstream end of the differential pressure power generation gas branch pipeline" is connected to the "gas main pipeline".

[0046] See Figure 2 The collaborative controller 8 is essentially a microcomputer controller, which mainly includes an MCU control unit and is equipped with a battery pack, voltage regulator circuit, RS485 circuit, generator voltage sampling unit, FLASH unit, valve drive circuit and 4G communication module.

[0047] In addition to having signal communication with the collaborative control valve 3, the first pressure sensor 11, and the second pressure sensor 12, the collaborative controller 8 also has data signal communication with the differential pressure generator 5. The collaborative controller 8 can collect the output voltage data signal of the differential pressure generator 5 through a dedicated communication line.

[0048] A control program specifically for the collaborative control valve 3 is set in the collaborative controller 8. For the convenience of description, this control program is defined as the collaborative control program.

[0049] When the collaborative controller 8 executes the collaborative control program, the following control functions can be achieved:

[0050] The collaborative controller 8 receives the "pressure data signal at the outlet of the differential pressure power generation branch collected by the second pressure sensor 12" and the "downstream pipe network pressure data signal collected by the first pressure sensor 11", and then controls the opening and closing of the collaborative control valve 3 according to the data signals provided by the two, that is, controls the start and stop of the gas differential pressure power generation system.

[0051] See Figure 3 more specifically,

[0052] 1) A pressure warning threshold is preset and represented by P3;

[0053] 2) Taking 30 minutes as a sampling period, the pressure at the outlet of the differential pressure power generation branch and the downstream pipe network pressure are sampled every sampling period.

[0054] Starting condition: When both P1 < P3 (downstream pipe network pressure is safe) and P2 is higher than the outlet pressure set value of the main station regulator and lower than the relief pressure of the pressure regulating station (that is, P2 is in a safe and power generation - available pressure range) are satisfied simultaneously, the collaborative controller 8 controls the opening of the collaborative control valve 3 to make the gas differential pressure power generation system operate and generate electricity;

[0055] Operating and shutdown conditions: During the operation of the system, P1 and P2 are continuously monitored. As long as the condition of P1 < P3 is continuously satisfied and P2 is maintained within the safe power generation range, the system continues to operate. If P1 >= P3 (the downstream pipe network pressure reaches the warning threshold, safety first) or P2 deviates from the safe power generation range, the collaborative controller 8 immediately controls the closing of the collaborative control valve 3 to stop the operation of the gas differential pressure power generation system.

[0056] In addition, for the control program of the collaborative control valve 3, the influence of the output voltage data signal of the differential pressure generator 5 can also be considered. That is to say, when controlling the opening and closing of the collaborative control valve 3, the output voltage data signal of the differential pressure generator 5 can also be used as a conditional factor in the collaborative control program.

[0057] It should be noted that the collaborative controller 8 is housed in an explosion-proof enclosure.

[0058] The explosion-proof box is also equipped with an MPPT.

[0059] The advantages of the pressure coordination control system of this embodiment are:

[0060] 1) Ensure the safety of gas supply in downstream pipelines: By executing the collaborative control program, the collaborative control valve 3 is opened and closed based on the collected pipeline pressure data signal, so as to control the start and stop of the gas differential pressure power generation system, thereby avoiding the gas main pipeline alarm caused by the differential pressure power generation operating at a low flow rate in the main station pressure regulator.

[0061] 2) Power generation efficiency guarantee: Utilize the gas flow rate during peak gas consumption periods at the pressure regulating station to achieve normal power generation and ensure efficient energy recovery;

[0062] 3) Improve the site adaptability of gas differential pressure power generation system: By utilizing the flow values ​​of the pressure regulating station at different times, the gas differential pressure power generation system can be installed at pressure regulating stations with small flow rates, while ensuring gas safety.

[0063] The above are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A pressure collaborative control system for a gas pressure difference power generation system, wherein the gas pressure difference power generation system is arranged in parallel with the main station pressure regulator; Its features are: The pressure collaborative control system includes a collaborative controller (8), a collaborative control valve (3), a second pressure sensor (12) and a first pressure sensor (11); The collaborative control valve (3) is arranged on the pressure difference power generation gas branch pipeline of the gas pressure difference power generation system and is located at the inlet of the pressure difference power generation gas branch pipeline; The second pressure sensor (12) is arranged on the pressure difference power generation gas branch pipeline of the gas pressure difference power generation system and is located on the downstream side of the pressure difference generator (5); The first pressure sensor (11) is arranged on the main gas pipeline and is located on the downstream side of the pressure difference power generation gas return point; A collaborative control program is set in the collaborative controller (8), and the collaborative controller (8) executes the collaborative control program. The control functions that can be achieved include: According to the pressure data signal of the outlet of the pressure difference power generation branch collected by the second pressure sensor (12) and the downstream pipeline network pressure data signal collected by the first pressure sensor (11), control the opening and closing of the collaborative control valve (3) to control the start and stop of the gas pressure difference power generation system.

2. The pressure coordination control system for a gas-fired differential pressure power generation system according to claim 1, characterized in that: Set P1 to represent the downstream pipeline network pressure and P2 to represent the outlet pressure of the pressure difference power generation branch; The collaborative control program specifically includes: Preset a pressure warning threshold P3; Taking 30 minutes as a sampling period, sample the outlet pressure of the pressure difference power generation branch and the downstream pipeline network pressure every sampling period, When both P1 < P3 and P2 are higher than the outlet pressure set value of the main station pressure regulator and lower than the relief pressure of the pressure regulating station are satisfied simultaneously, control to open the collaborative control valve (3) to make the gas pressure difference power generation system operate and generate electricity; During the operation of the system, continuously monitor P1 and P2. When the condition of P1 < P3 is continuously satisfied and P2 is maintained within the safe power generation range, the system continues to operate. If P1 >= P3 or P2 deviates from the safe power generation range, control to close the collaborative control valve (3) to make the gas pressure difference power generation system stop operating.

3. The pressure coordination control system for a gas-fired differential pressure power generation system according to claim 1, characterized in that: The collaborative controller (8) includes an MCU control unit, a battery pack, a voltage stabilizing circuit, an RS485 circuit, a generator voltage sampling unit, a FLASH unit, a valve driving circuit and a 4G communication module.

4. The pressure coordination control system for a gas-fired differential pressure power generation system according to claim 1, characterized in that: The collaborative controller (8) is placed in an explosion-proof box.

5. The pressure coordination control system for a gas-fired differential pressure power generation system according to claim 4, characterized in that: An MPPT is arranged in the explosion-proof box.

6. The pressure coordination control system for a gas-fired differential pressure power generation system according to claim 1, characterized in that: The collaborative control valve (3) is an electric ball valve.

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