Dual control system for working pressure regulating valve of natural gas pressure regulating device and its control method

Abstract

This invention relates to the field of dual control system technology for pressure regulating valves, and in particular to a dual control system and control method for a working pressure regulating valve in a natural gas pressure regulating device. The system includes a pressure regulating valve, a pressure stabilizer, a regulating controller, a high-pressure reducing valve, a low-pressure reducing valve, a first solenoid valve, a second solenoid valve, a first reversing valve, a second reversing valve, a third reversing valve, a fourth reversing valve, and a valve positioner. The pressure stabilizer is connected to the upstream valve of the pressure regulating valve, the IN port of the first reversing valve, and the OUT2 port of the second reversing valve. In use, the dual control system and control method for the working pressure regulating valve in a natural gas pressure regulating device of this invention switches between automatic control mode and remote control mode via the first solenoid valve. This allows the downstream pressure of the pressure regulating valve to reach the set pressure or the valve opening of the pressure regulating valve to be remotely controlled and its downstream pressure controlled, facilitating on-site operation and meeting customer requirements.

Description

Technical Field

[0001] This invention relates to the field of dual control system technology for pressure regulating valves, and in particular to a dual control system for a working pressure regulating valve in a natural gas pressure regulating device and its control method. Background Technology

[0002] Valves used in natural gas pressure regulating devices mainly include safety shut-off valves, monitoring and regulating valves, and working regulating valves. Among them, the working regulating valves undertake the main pressure regulating task, ensuring stable downstream pipeline pressure. With the rapid increase in domestic natural gas transmission pipelines, existing systems control pipeline pressure through external actuators. However, these external actuators have limited functionality, and due to the complexity of pipeline operations, they cannot be controlled in real time to achieve stable downstream pressure. This reduces the applicability of external actuators and increases the workload of operators. Summary of the Invention

[0003] The technical problem to be solved by this invention is: in order to address the problem that existing methods of controlling pipeline pressure through external actuators have limited functionality, and due to the complexity of pipeline operations, it is impossible to control the external actuators in real time to achieve stable pressure after the control valve, thus reducing the applicability of the external actuators and increasing the labor intensity of the workers. The present invention provides a dual control system for the working pressure regulating valve of a natural gas pressure regulating device and its control method.

[0004] The technical solution adopted by this invention to solve its technical problem is: a dual control system for a working pressure regulating valve of a natural gas pressure regulating device, including a pressure regulating valve, a pressure stabilizer, a regulating controller, a high-pressure reducing valve, a low-pressure reducing valve, a first solenoid valve, a second solenoid valve, a first reversing valve, a second reversing valve, a third reversing valve, a fourth reversing valve, and a valve positioner. The pressure stabilizer is connected to the inlet of the pressure regulating valve, the IN port of the first reversing valve, and the OUT2 port of the second reversing valve. The regulating controller is connected to the outlet of the pressure regulating valve, the OUT2 port of the first reversing valve, the OUT2 port of the third reversing valve, and the OUT2 port of the fourth reversing valve. The valve positioner is connected to the OUT1 port of the first reversing valve and the I port of the second solenoid valve. The N port is connected, the OUT port of the second solenoid valve is connected to the OUT1 port of the fourth directional valve, the E port of the second solenoid valve is connected to the outside, the OUT port of the first solenoid valve is connected to the first, second, third, and fourth directional valves respectively, the IN port of the first solenoid valve is connected to the downstream of the pressure regulating valve, the E port of the first solenoid valve is connected to the outside, the IN port of the second directional valve is connected to the downstream of the pressure regulating valve, the OUT port of the second directional valve is connected to the outside, the IN port of the third directional valve is connected to the spring chamber of the pressure regulating valve, the IN port of the fourth directional valve is connected to the working chamber of the pressure regulating valve, and a low-pressure reducing valve is connected in series between the IN port of the first solenoid valve and the downstream of the pressure regulating valve. Compared with the prior art, this solution controls the dual control system to switch between automatic control mode and remote control mode through the first solenoid valve, realizing the pressure downstream of the pressure regulating valve to the set pressure or remotely controlling the valve opening of the pressure regulating valve and controlling its downstream pressure, which is convenient for on-site operation and meets customer requirements.

[0005] To enable the control system to meet a wider range of operating conditions, in some preferred embodiments, a high-pressure reducing valve is connected in series between the low-pressure reducing valve and the pressure regulating valve. By connecting the high-pressure reducing valve in series between the low-pressure reducing valve and the pressure regulating valve, the high-pressure reducing valve will first reduce the pressure to the required range, thereby improving the applicability of the control system and meeting the needs of more operating conditions.

[0006] In some preferred embodiments, the first reversing valve, the second reversing valve, the third reversing valve, and the fourth reversing valve are all pneumatic reversing valves.

[0007] A control method for a dual control system for a working pressure regulating valve of a natural gas pressure regulating device, as described above, is provided. This control method switches the dual control system for the working pressure regulating valve of the natural gas pressure regulating device between automatic control mode and remote control mode by controlling the first solenoid valve. The specific operation steps are as follows:

[0008] When switching to automatic control mode, both the first and second solenoid valves are de-energized, and the IN and OUT ports of the first and second solenoid valves are not connected. The IN and OUT2 ports of the first, second, third, and fourth directional valves are connected. The downstream pressure of the pressure regulating valve acts on the regulating controller and the pressure regulator. The automatic control of the pressure regulating valve is achieved through the combined action of the regulating controller and the pressure regulator.

[0009] When switching to remote control mode, the first solenoid valve is energized, and its IN and OUT ports are connected. The first solenoid valve controls the first, second, third, and fourth directional valves to switch directions. The IN and OUT1 ports of the first, second, third, and fourth directional valves are connected. The second solenoid valve is de-energized, and its OUT and E ports are connected. At this time, the pressure in the spring chamber and working chamber of the pressure regulating valve is released. After the pressure in the spring chamber and working chamber of the pressure regulating valve is released, the second solenoid valve is energized, controlling the valve positioner to send a command signal to control the valve opening of the pressure regulating valve, thereby controlling the downstream pressure of the pressure regulating valve.

[0010] The beneficial effects of this invention are as follows: When the dual control system and control method for the working pressure regulating valve of the natural gas pressure regulating device of this invention are used, the dual control system switches between automatic control mode and remote control mode through the first solenoid valve, so as to realize the pressure after the pressure regulating valve to the set pressure or remotely control the valve opening of the pressure regulating valve and control its downstream pressure. This facilitates on-site operation and meets customer requirements. It avoids the problems of existing external actuators for pipeline pressure control, which have limited functions. Due to the complexity of pipeline operation, it is impossible to control the external actuators in real time to achieve stable pressure after the control valve, which reduces the applicability of the external actuators and increases the labor intensity of the workers. Attached Figure Description

[0011] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0012] Figure 1 This is a schematic diagram of the structure of the present invention.

[0013] In the diagram: 1. Pressure regulating valve, 2. Pressure stabilizer, 3. Regulator, 4. High-pressure reducing valve, 5. Low-pressure reducing valve, 6. First solenoid valve, 7. Second solenoid valve, 8. First directional valve, 9. Second directional valve, 10. Third directional valve, 11. Fourth directional valve, 12. Valve positioner. Detailed Implementation

[0014] The present invention will be further described in detail below with reference to the embodiments:

[0015] This invention is not limited to the specific embodiments listed below. Those skilled in the art can implement this invention using various other specific embodiments based on the content disclosed herein. Any modifications or alterations made to the design structure and concept of this invention fall within the protection scope of this invention. It should be noted that, unless otherwise specified, the embodiments and features described in this invention can be combined with each other.

[0016] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0017] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0018] like Figure 1As shown, a dual control system for a working pressure regulating valve 1 in a natural gas pressure regulating device includes a pressure regulating valve 1, a pressure stabilizer 2, a regulating controller 3, a high-pressure reducing valve 4, a low-pressure reducing valve 5, a first solenoid valve 6, a second solenoid valve 7, a first reversing valve 8, a second reversing valve 9, a third reversing valve 10, a fourth reversing valve 11, and a valve positioner 12. The pressure stabilizer 2 is connected to the inlet of the pressure regulating valve 1, the IN port of the first reversing valve 8, and the OUT2 port of the second reversing valve 9. The regulating controller 3 is connected to the outlet of the pressure regulating valve 1, the OUT2 port of the first reversing valve 8, the OUT2 port of the third reversing valve 10, and the OUT2 port of the fourth reversing valve 11. The valve positioner 12 is connected to the first reversing valve 8, the pressure regulating valve 1, the pressure stabilizer 2, the regulating controller 3, the high-pressure reducing valve 4, the low-pressure reducing valve 5, the first solenoid valve 6, the second solenoid valve 7, the first reversing valve 8, the second reversing valve 9, the third reversing valve 10, the fourth reversing valve 11, and a valve positioner 12. The OUT1 port of the first solenoid valve 6 is connected to the IN port of the second solenoid valve 7, the OUT port of the second solenoid valve 7 is connected to the OUT1 port of the fourth solenoid valve 11, and the E port of the second solenoid valve 7 is connected to the outside. The OUT port of the first solenoid valve 6 is connected to the first solenoid valve 8, the second solenoid valve 9, the third solenoid valve 10, and the fourth solenoid valve 11 respectively. The IN port of the first solenoid valve 6 is connected to the downstream of the pressure regulating valve 1, and the E port of the first solenoid valve 6 is connected to the outside. The IN port of the second solenoid valve 9 is connected to the downstream of the pressure regulating valve 1, and the OUT port of the second solenoid valve 9 is connected to the outside. The IN port of the third solenoid valve 10 is connected to the spring chamber of the pressure regulating valve 1, and the IN port of the fourth solenoid valve 11 is connected to the working chamber of the pressure regulating valve 1. A low-pressure reducing valve 5 is connected in series between the IN port of the first solenoid valve 6 and the downstream of the pressure regulating valve 1.

[0019] A high-pressure reducing valve 4 is connected in series between the low-pressure reducing valve 5 and the pressure regulating valve 1.

[0020] The first reversing valve 8, the second reversing valve 9, the third reversing valve 10 and the fourth reversing valve 11 are all pneumatic reversing valves.

[0021] A control method for a dual control system for a working pressure regulating valve 1 of a natural gas pressure regulating device, as described above, wherein the control method switches the dual control system for the working pressure regulating valve 1 of the natural gas pressure regulating device between automatic control mode and remote control mode by controlling the first solenoid valve 6. The specific operation steps are as follows:

[0022] When switching to automatic control mode, both the first solenoid valve 6 and the second solenoid valve 7 are de-energized, and the IN and OUT ports of the first solenoid valve 6 and the second solenoid valve 7 are not connected. The IN and OUT2 ports of the first reversing valve 8, the second reversing valve 9, the third reversing valve 10 and the fourth reversing valve 11 are connected. The downstream pressure of the pressure regulating valve 1 acts on the regulating controller 3 and the pressure regulator 2. The automatic control of the pressure regulating valve 1 is achieved through the combined action of the regulating controller 3 and the pressure regulator 2.

[0023] When switching to remote control mode, the first solenoid valve 6 is energized, and its IN and OUT ports are connected. The first solenoid valve 6 controls the first directional valve 8, the second directional valve 9, the third directional valve 10, and the fourth directional valve 11 to switch directions. The IN and OUT ports of the first directional valve 8, the second directional valve 9, the third directional valve 10, and the fourth directional valve 11 are connected. The second solenoid valve 7 is de-energized, and its OUT and E ports are connected. At this time, the pressure in the spring chamber and working chamber of the pressure regulating valve 1 is released. After the pressure in the spring chamber and working chamber of the pressure regulating valve 1 is released, the second solenoid valve 7 is energized, controlling the valve positioner 12 to send a command signal to control the valve opening of the pressure regulating valve 1, thereby controlling the downstream pressure of the pressure regulating valve 1.

[0024] When the above-mentioned natural gas pressure regulating device uses a dual control system for the working pressure regulating valve and its control method, the dual control system is first switched between automatic control mode and remote control mode by the first solenoid valve 6 according to the usage requirements. In automatic control mode, the pressure after the pressure regulating valve 1 is first reduced to the required range by the high-pressure reducing valve 4, and then the pressure is adjusted to the required pressure by the low-pressure reducing valve 5. Then, the pressure enters the IN port of the first solenoid valve 6, controlling the first solenoid valve 6 and the second solenoid valve 7 to be de-energized. At this time, the E port and OUT port of the first solenoid valve 6 and the second solenoid valve 7 are connected, that is, the first solenoid valve 6 and the second solenoid valve 7 have no output pressure. The signal ports of the first reversing valve 8, the second reversing valve 9, the third reversing valve 10 and the fourth reversing valve 11 have no pressure. The IN port and OUT port of the first reversing valve 8, the second reversing valve 9, the third reversing valve 10 and the fourth reversing valve 11 are connected. When UT2 is open, the pressure before the pressure regulating valve 1 is connected to the IN port of the pressure regulator 2 and provides a power source. At the same time, the pressure after the pressure regulating valve 1, P, enters the SIG port of the pressure regulator 2 through the second reversing valve 9. The output pressure of the OUT port of the pressure regulator 2 is P + 0.3 MPa. The output pressure of the pressure regulator 2 enters the SIG port of the regulating controller 3 through the first reversing valve 8, and then enters the working chamber of the working pressure regulating valve 1 through the fourth reversing valve 11, causing the valve of the pressure regulating valve 1 to close. The pressure after the pressure of the other pressure regulating valve 1 is compared with the set pressure of the regulating controller 3. The output pressure of the regulating controller 3 enters the spring chamber of the pressure regulating valve 1 through the third reversing valve 10. When the pressure after the pressure of the pressure regulating valve 1 changes, it drives the output pressure of the regulating controller 3 to change, thereby controlling the opening of the valve in real time, so that the pressure after the pressure regulating valve 1 reaches the set pressure, realizing self-regulating pressure control.

[0025] In remote control mode, the downstream pressure of pressure regulating valve 1 is reduced to the required range by high-pressure pressure reducing valve 4, and then adjusted to the required pressure by low-pressure pressure reducing valve 5 before entering the IN port of the first solenoid valve 6. This energizes the first solenoid valve 6, connecting its IN and OUT ports. The second solenoid valve 7 is de-energized, connecting its E and OUT ports. The output pressure from the first solenoid valve 6 reaches the signal ports of the first directional valve 8, second directional valve 9, third directional valve 10, and fourth directional valve 11. The IN and OUT ports of these valves are then connected, and the pressure regulating valve... The working chamber pressure of pressure regulating valve 1 is vented through the fourth directional valve 11 and the second solenoid valve 7. The spring chamber pressure of pressure regulating valve 1 is vented through the third directional valve 10, which energizes the second solenoid valve 7. The IN and OUT ports of the second solenoid valve 7 are connected. The upstream pressure of pressure regulating valve 1 is connected to the IN port of pressure regulator 2 and provides a power source. The upstream pressure of pressure regulating valve 1 enters the input port of valve positioner 12 through the output port of pressure regulator 2. The output pressure of valve positioner 12 enters the working chamber of pressure regulating valve 1 through the second solenoid valve 7 and the fourth directional valve 11, and provides a 4-20mA signal to valve positioner 12 to control the opening degree of pressure regulating valve 1, thereby realizing remote control of downstream pressure.

[0026] The above description, based on the preferred embodiments of the present invention, provides inspiration. Those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification but must be determined according to the claims.

Claims

1. A dual control system for a working pressure regulating valve in a natural gas pressure regulating device, comprising a pressure regulating valve (1), characterized in that: It also includes a pressure regulator (2), a regulating controller (3), a high-pressure reducing valve (4), a low-pressure reducing valve (5), a first solenoid valve (6), a second solenoid valve (7), a first reversing valve (8), a second reversing valve (9), a third reversing valve (10), a fourth reversing valve (11), and a valve positioner (12). The IN port of the pressure regulator (2) is connected to the valve inlet of the pressure regulating valve (1), the OUT port of the pressure regulator (2) is connected to the IN port of the first reversing valve (8), and the SIG port of the pressure regulator (2) is connected to the second reversing valve (9). The OUT2 port of the regulating controller (3) is connected to the downstream port of the pressure regulating valve (1), the SIG port of the regulating controller (3) is connected to the OUT2 port of the first reversing valve (8) and the OUT2 port of the fourth reversing valve (11), the OUT port of the regulating controller (3) is connected to the OUT2 port of the third reversing valve (10), the valve positioner (12) is connected to the OUT1 port of the first reversing valve (8) and the IN port of the second solenoid valve (7), and the OUT port of the second solenoid valve (7) is connected to the OUT2 port of the first reversing valve (8). The OUT1 port of the fourth directional valve (11) is connected, the E port of the second solenoid valve (7) is connected to the outside, the OUT port of the first solenoid valve (6) is connected to the first directional valve (8), the second directional valve (9), the third directional valve (10) and the fourth directional valve (11) respectively, the IN port of the first solenoid valve (6) is connected to the downstream of the pressure regulating valve (1), the E port of the first solenoid valve (6) is connected to the outside, the IN port of the second directional valve (9) is connected to the downstream of the pressure regulating valve (1), and the second directional valve (9) The OUT1 port of the third reversing valve (10) is connected to the outside, the IN port of the third reversing valve (10) is connected to the spring chamber of the pressure regulating valve (1), the OUT1 port of the third reversing valve (10) is connected to the outside, the IN port of the fourth reversing valve (11) is connected to the working chamber of the pressure regulating valve (1), and a low-pressure reducing valve (5) is connected in series between the IN port of the first solenoid valve (6) and the valve downstream of the pressure regulating valve (1). By controlling the first solenoid valve (6), the dual control system for the working pressure regulating valve of the natural gas pressure regulating device can switch between automatic control mode and remote control mode.

2. The dual control system for the working pressure regulating valve of the natural gas pressure regulating device according to claim 1, characterized in that: A high-pressure reducing valve (4) is connected in series between the low-pressure reducing valve (5) and the pressure regulating valve (1).

3. The dual control system for the working pressure regulating valve of the natural gas pressure regulating device according to claim 1, characterized in that: The first reversing valve (8), the second reversing valve (9), the third reversing valve (10) and the fourth reversing valve (11) are all pneumatic reversing valves.

4. A control method employing a dual control system for a working pressure regulating valve in a natural gas pressure regulating device as described in any one of claims 1-3, characterized in that, This control method achieves switching between automatic control mode and remote control mode for the dual control system of the working pressure regulating valve of the natural gas pressure regulating device by controlling the first solenoid valve (6). The specific operation steps are as follows: When switching to automatic control mode, the first solenoid valve (6) and the second solenoid valve (7) are de-energized. The IN and OUT ports of the first solenoid valve (6) and the second solenoid valve (7) are not connected. The IN and OUT2 ports of the first reversing valve (8), the second reversing valve (9), the third reversing valve (10) and the fourth reversing valve (11) are connected. The pressure after the pressure regulating valve (1) acts on the regulating controller (3) and the pressure regulator (2). The automatic control of the pressure regulating valve (1) is achieved through the combined action of the regulating controller (3) and the pressure regulator (2). When switching to remote control mode, the first solenoid valve (6) is energized, and the IN port and OUT port of the first solenoid valve (6) are connected. The first solenoid valve (6) controls the first reversing valve (8), the second reversing valve (9), the third reversing valve (10) and the fourth reversing valve (11) to switch. The IN port and OUT1 port of the first reversing valve (8), the second reversing valve (9), the third reversing valve (10) and the fourth reversing valve (11) are connected. The second solenoid valve (7) is de-energized, and the OUT port and E port of the second solenoid valve (7) are connected. At this time, the pressure in the spring chamber and working chamber of the pressure regulating valve (1) is emptied. After the pressure in the spring chamber and working chamber of the pressure regulating valve (1) is emptied, the second solenoid valve (7) is energized and controls the valve positioner (12) to generate a command signal to control the valve opening of the pressure regulating valve (1), thereby controlling the downstream pressure of the pressure regulating valve (1).

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