Gas-liquid linkage stop valve control system of natural gas pipeline network

Abstract

The utility model discloses a natural gas pipeline network gas-liquid linkage stop valve control system which comprises an SCADA system, a gas-liquid linkage stop valve and a pressure transmitter, and the SCADA system comprises an AI module, a DI module, a DO module and a microprocessor. The pressure transmitter is arranged on the natural gas pipeline at the front end and / or the rear end of the gas-liquid linkage stop valve; the SCADA system receives a pressure signal of the pressure transmitter through the AI module; and the microprocessor processes the pressure signal to obtain a pressure drop rate, and compares the pressure drop rate with a set threshold value, so that the DO module outputs a corresponding digital signal to an electromagnetic valve corresponding to the gas-liquid linkage stop valve. The utility model discloses. According to the utility model, an electronic control unit is replaced by the SCADA system, and the gas-liquid linkage stop valve is controlled according to the pressure drop rate; the problems that the electronic control unit frequently breaks down and the maintenance cost is high are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to remote dispatch technical field, concretely is a natural gas pipe network gas-liquid linkage cut -out valve control system. BACKGROUND

[0002] At present, the valve chamber cut -out valve and the gas station valve of gas station are set to gas-liquid linkage cut -out valve, and each gas-liquid linkage cut -out valve is equipped with electronic control unit, and the upstream and downstream of gas-liquid linkage cut -out valve are equipped with pressure transmitter, and the electronic control unit of valve chamber cut -out valve and gas station valve receives the pressure signal monitored by pressure transmitter, and the opening and closing of gas-liquid linkage cut -out valve are controlled according to pressure drop rate, and when the pressure drop rate is out of standard, the valve is automatically closed.

[0003] In actual operation, the electronic control unit finds that the electronic components often appear failure, and the maintenance cost is high.For reducing the maintenance engineering quantity of gas-liquid linkage cut -out valve actuator, we propose a kind of natural gas pipe network gas-liquid linkage cut -out valve control system. UTILITY MODEL CONTENT

[0004] The utility model aims at the shortcoming and problem in background art and makes improvement and innovation, provides a kind of natural gas pipe network gas-liquid linkage cut -out valve control system.

[0005] A kind of natural gas pipe network gas-liquid linkage cut -out valve control system, including SCADA system, gas-liquid linkage cut -out valve and pressure transmitter, the SCADA system includes AI module, DI module, DO module and microprocessor;

[0006] The pressure transmitter is arranged on the natural gas pipeline before and / or after the gas-liquid linkage cut -out valve;

[0007] The SCADA system receives the pressure signal of pressure transmitter by AI module;

[0008] The microprocessor processes pressure signal to obtain pressure drop rate, and compares pressure drop rate with set threshold value, so that DO module exports corresponding digital signal to the corresponding electromagnetic valve of gas-liquid linkage cut -out valve.

[0009] Further scheme is, the gas-liquid linkage cut -out valve can be valve chamber cut -out valve or gas station valve of gas station.

[0010] Further scheme is, the SCADA system can be RTU or PLC.

[0011] Further scheme is, the SCADA system further includes clock module, the microprocessor is electrically connected with clock module, and the clock module is used to measure the duration that pressure drop rate exceeds set threshold value.

[0012] Further, the SCADA system is connected with an alarm through a DO module, when the monitored pressure drop rate exceeds the set threshold, the DO module outputs a high level signal to the alarm to make the alarm alarm.

[0013] Further, the SCADA system is connected with an alarm through a DO module, when the monitored pressure drop rate exceeds the set threshold, the DO module outputs a high level signal to the alarm to make the alarm alarm.

[0014] Further, the SCADA system is connected with an alarm through a DO module, when the monitored pressure drop rate exceeds the set threshold, the DO module outputs a high level signal to the alarm to make the alarm alarm.

[0015] Compared with the prior art, the natural gas pipeline network gas-liquid linkage cut-off valve control system has the advantages that: the SCADA system is used to replace the electronic control unit, and the gas-liquid linkage cut-off valve is controlled according to the pressure drop rate; the natural gas station or the valve chamber itself needs to send the monitored pressure signal, temperature signal and flow signal to the remote monitoring center platform through the SCADA system; therefore, the electronic control unit can be saved, and the problem of frequent failures and high maintenance cost of the electronic control unit is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The installation structure diagram of the gas-liquid linkage cut-off valve and the bypass valve on the natural gas pipeline is provided for the embodiment of the utility model.

[0017] Figure 2 The structure diagram of the natural gas pipeline network gas-liquid linkage cut-off valve control system is provided for the embodiment of the utility model.

[0018] The drawings show that: 1, the SCADA system; 2, gas-liquid linkage cut-off valve; 3, bypass valve; 4, pressure transmitter; 5, touch screen; 6, alarm; 101, DI module; 102, AI module; 103, microprocessor; 104, DO module; 105, clock module; 106, AO module. DETAILED DESCRIPTION

[0019] In order to make the purpose, features and advantages of the utility model more obvious and easy to understand, the specific embodiment of the utility model is described in detail below with reference to the drawings.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application. As used in this description, the singular forms "a", "an" and "the" include plural references unless the context clearly dictates otherwise. The term "and / or" includes any and all combinations of one or more of the associated listed items.

[0021] Referring to Figures 1-2 The natural gas pipeline network gas-liquid linkage cut-off valve control system provided by the application comprises a SCADA system 1, wherein the SCADA system 1 is a data acquisition and monitoring control system and is a computer-based industrial automation system. The SCADA system 1 can be an RTU (remote terminal unit) or a PLC. The SCADA system 1 comprises an AI module 102, a DI module 101, an AO module 106, a DO module 104 and a microprocessor 103. The AI module 102 is used for receiving analog signals, the DI module 101 is used for receiving digital signals, the AO module 106 is used for outputting analog signals, and the DO module 104 is used for outputting digital signals.

[0022] As shown in Figure 1 A gas-liquid linkage cut-off valve 2 is arranged on the natural gas pipeline network, and the gas-liquid linkage cut-off valve 2 can be a valve chamber cut-off valve or a gas station cross-station valve. A pressure transmitter 4 is arranged on the natural gas pipeline located at the front end and the rear end of the gas-liquid linkage cut-off valve 2, and a bypass valve 3 is arranged on the natural gas pipeline in parallel with the gas-liquid linkage cut-off valve 2. The pressure transmitter 4 is responsible for monitoring the pressure level of the natural gas in the natural gas pipeline. The SCADA system 1 receives the pressure signal of the pressure transmitter 4 through the AI module 102 and receives the on-off signals of the bypass valve 3 and the gas-liquid linkage cut-off valve 2 through the DI module 101. The SCADA system 1 is also connected to the relay corresponding to the bypass valve 3 and the electromagnetic valve corresponding to the gas-liquid linkage cut-off valve 2 through the DO module 104. When the DO module 104 outputs a high level to the relay corresponding to the bypass valve 3, the coil of the relay is energized, and then the normally open switch of the relay is closed and the normally closed switch is opened, so that the bypass valve 3 is closed. When the DO module 104 outputs a high level to the electromagnetic valve corresponding to the gas-liquid linkage cut-off valve 2, the electromagnetic valve corresponding to the gas path of the gas-liquid linkage cut-off valve 2 is closed, and the hydraulic power cannot be converted from the gas power, so that the gas-liquid linkage cut-off valve 2 is closed.

[0023] Specifically, the SCADA system 1 further comprises a clock module 105, the microprocessor 103 of the SCADA system 1 is electrically connected with the clock module 105, after the SCADA system 1 receives the pressure signal of the pressure transmitter 4 through the AI module 102, the microprocessor 103 of the SCADA system 1 processes the pressure signal, judges whether the pressure drop rate is greater than the set threshold value, if the pressure drop rate is greater than the set threshold value, the SCADA system 1 outputs the DI signal (digital signal) to the corresponding relay of the bypass valve 3 or the electromagnetic valve of the gas-liquid linkage cut-off valve 2 through the DO module 104, so that the bypass valve 3 or the gas-liquid linkage cut-off valve 2 is closed.

[0024] Preferably, the SCADA system 1 can further time the duration that the pressure drop rate is greater than the set threshold value through the clock module 105, when the duration that the pressure drop rate is greater than the set threshold value is greater than the preset time, the SCADA system 1 outputs the DI signal (digital signal) to the corresponding bypass valve 3 or gas-liquid linkage cut-off valve 2. In this embodiment, when the pressure drop rate reaches 0.15 MPa / min and lasts for 120 seconds, the SCADA system 1 outputs the high-level signal to the corresponding bypass valve 3 or gas-liquid linkage cut-off valve 2.

[0025] Preferably, the SCADA system 1 is further connected with the touch screen 5 through the DI module 101, and the bypass valve 3 or the gas-liquid linkage cut-off valve 2 can be controlled by selecting the touch screen 5. The touch screen 5 outputs the corresponding DI signal to the SCADA system 1, and the SCADA system 1 interlocks the pressure signal monitored by the pressure transmitter 4 with the gas-liquid linkage cut-off valve 2 or the bypass valve 3 connected in parallel with the gas-liquid linkage cut-off valve 2 according to the digital signal output by the touch screen 5; that is, when the pressure drop rate reaches 0.15 MPa / min and lasts for 120 seconds, the SCADA system 1 closes the gas-liquid linkage cut-off valve 2 or the bypass valve 3 connected in parallel with the gas-liquid linkage cut-off valve 2.

[0026] Preferably, the SCADA system 1 is also connected with the alarm 6 through the DO module 104, when the pressure drop rate is greater than the set threshold, the SCADA system 1 outputs a high level signal to the alarm 6 through the DO module 104, so that the alarm 6 gives an alarm. In this embodiment, when the pressure drop rate reaches 0.1 MPa / min, the SCADA system 1 triggers the alarm 6 to give a high alarm, and when the pressure drop rate reaches 0.15 MPa / min, the SCADA system 1 triggers the alarm 6 to give a high-high alarm. The corresponding alarm sound of the high-high alarm can be more urgent than that of the high alarm. Wherein, the SCADA system 1 can output corresponding high level signals to different alarms 6 through different DO channels to realize high alarm or high-high alarm; the SCADA system 1 can also output a combination of multiple DO signals to the same alarm 6 through the DO channel, so that the alarm 6 gives different alarm levels; the above methods are not specifically limited by the application, and are within the protection scope of the application.

[0027] It should be noted that the SCADA system 1 itself is also connected with the wireless data transmission module, and the monitored pressure signal, temperature signal and flow signal are sent to the remote monitoring center platform; therefore, in this embodiment, the gas-liquid linkage cut-off valve 2 is controlled by the SCADA system 1, and the SCADA system 1 is not added, but the original SCADA system 1 is fully utilized.

[0028] In summary, the utility model discloses a natural gas pipe network gas-liquid linkage cut-off valve control system, through SCADA system 1 replaces electronic control unit, according to pressure drop rate to control gas-liquid linkage cut-off valve 2, because natural gas station or valve room itself needs to send the monitored pressure signal, temperature signal and flow signal to the remote monitoring center platform through the SCADA system 1, therefore, the system can save the electronic control unit, avoid the electronic control unit frequently malfunction, and the maintenance cost is higher.

[0029] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0030] In the description of the application, references to "an embodiment", "some embodiments", "certain embodiments", "an example", "a specific example", or "some examples" mean that a particular feature, structure, material, or characteristic being described is included in at least one embodiment or example of the application. The appearances of the phrases above in various places in the specification are not necessarily all referring to the same embodiment or example.

[0031] It is apparent that the described embodiments are only some, but not all, of the embodiments of the present application. In this document, the terms "embodiment" and "some embodiments" refer to specific embodiments of a claim or of the application as a whole. The phrase "some aspects of the embodiments" does not necessarily refer to the same embodiment or aspect, but can refer to a combination of different aspects of different embodiments. The phrase "at least one of the aspects" does not necessarily refer to the same aspect or aspect combination, but can refer to a combination of different aspects. It is further apparent that the described embodiments can be combined with other embodiments without doing creative work. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments described in the present application without doing creative work are within the scope of the present application. Although the embodiments of the present application have been shown and described, it is understood that various changes, modifications, substitutions and variations can be made thereto without departing from the principles and scope of the present application, the scope of which is defined by the claims and their equivalents.

Claims

1. A natural gas pipeline network gas-liquid coupled shut-off valve control system, characterized by: The system comprises a SCADA system (1), a gas-liquid linkage cut-off valve (2) and a pressure transmitter (4), wherein the SCADA system (1) comprises an AI module (102), a DI module (101), a DO module (104) and a microprocessor (103); The pressure transmitter (4) is arranged on the natural gas pipeline in front of and / or behind the gas-liquid linkage cut-off valve (2); The SCADA system (1) receives the pressure signal of the pressure transmitter (4) through the AI module (102); The microprocessor (103) processes the pressure signal to obtain the pressure drop rate, compares the pressure drop rate with the set threshold value, and outputs the corresponding digital signal to the corresponding electromagnetic valve of the gas-liquid linkage cut-off valve (2) through the DO module (104).

2. The control system for a gas-liquid linked shut-off valve of a natural gas pipeline network according to claim 1, characterized in that: The gas-liquid linkage cut-off valve (2) can be a valve chamber cut-off valve or a gas station over-station valve.

3. The control system for a gas-liquid linked shutoff valve of a natural gas pipeline network according to claim 1, characterized in that: The SCADA system (1) can be an RTU or a PLC.

4. The natural gas pipeline network gas-liquid linkage shut-off valve control system according to claim 1, characterized in that: The SCADA system (1) further comprises a clock module (105), the microprocessor (103) is electrically connected with the clock module (105), and the clock module (105) is used for measuring the duration that the pressure drop rate exceeds the set threshold value.

5. The natural gas pipeline network gas-liquid coupled shut-off valve control system according to claim 1, characterized in that: The SCADA system (1) is connected with an alarm (6) through the DO module (104), when the pressure drop rate exceeding the set threshold value is monitored, the DO module (104) outputs a high-level signal to the alarm (6) to make the alarm (6) alarm.

6. The natural gas pipeline network gas-liquid coupled shut-off valve control system according to claim 1, characterized in that: The system further comprises a bypass valve (3), the bypass valve (3) is connected in parallel with the gas-liquid linkage cut-off valve (2) on the natural gas pipeline, the DO module (104) is connected with the relay of the bypass valve (3), when the pressure drop rate exceeding the set threshold value is monitored, the DO module (104) outputs the corresponding digital signal to the corresponding relay of the bypass valve (3).

7. A control system for a gas-liquid linked shut-off valve of a natural gas pipeline network according to claim 6, characterized in that: The SCADA system (1) is further connected with a touch screen (5) through the DI module (101), the touch screen (5) outputs different digital signals to the DI module (101), and the SCADA system (1) connects the pressure signal monitored by the pressure transmitter (4) with the gas-liquid linkage cut-off valve (2) or the bypass valve (3) according to the digital signal output by the touch screen (5).

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