Gas pipeline replacement ventilation precision control equipment

Abstract

The utility model discloses a kind of gas pipeline replacement ventilation precision control equipment, including for real-time monitoring gas flow rate and pressure in main pipeline, and according to actual operation condition, replacement gas flow rate, pressure parameter is automatically adjusted replacement boost control component and for real-time monitoring gas concentration and environmental concentration in diffusion pipeline and with the replacement boost control component linkage diffusion control component, the replacement boost control component and the diffusion control component are communicated with the both ends of main pipeline, when the diffusion control component detects that gas concentration in diffusion pipe is qualified or environmental concentration is overproof, signal is sent, replacement ventilation operation is stopped.The utility model can monitor and control gas flow rate and pressure in main pipeline in replacement, boost control point, according to actual operation condition, replacement gas flow rate, pressure and other technical parameters are automatically adjusted, reach precision control requirement, reduce the workload of operating personnel, improve operating efficiency.

Description

Technical Field

[0001] This utility model relates to the technical field, and in particular to a precise control device for gas pipeline replacement and ventilation. Background Technology

[0002] Pipeline replacement is a crucial step in production and operation, playing a vital role in maintaining the normal operation of urban gas systems and ensuring user safety. The process includes venting, replacement, and pressurization, with replacement operations taking two forms: pipeline ventilation and pipeline deactivation. Methods include direct and indirect replacement. Direct replacement involves replacing air in gas facilities with gas, or vice versa. Indirect replacement involves replacing air in gas facilities with inert gas or water, followed by replacing the inert gas or water with gas; or replacing gas facilities with inert gas or water, followed by replacing the inert gas or water with air.

[0003] The existing replacement operation has the following problems:

[0004] 1. The work process relies heavily on human experience, making it difficult to guarantee the quality of the work.

[0005] 2. High workload and urgent need to improve automation: In actual replacement operations, manual operation of valves, observation of pressure gauges, and operation of venting valves are largely carried out manually, while concentration monitoring is performed at detection points, requiring a large amount of manual work. Specifically:

[0006] (1) The operation is not very precise and the replacement ventilation operation is inefficient;

[0007] (2) Lack of venting technical parameters causes vibration and noise emission from the venting pipe;

[0008] (3) The isolation between concentration detection and control leads to waste of resources and safety risks;

[0009] (4) The pressure boosting process lacks standardized procedures, making actual operation difficult.

[0010] In view of this, how to design a precise control device for gas pipeline replacement and ventilation that can solve the above-mentioned technical problems is the subject of the inventor's in-depth research. Utility Model Content

[0011] The purpose of this utility model is to provide a precise control device for gas pipeline replacement and ventilation. It can monitor and control the gas flow rate and pressure in the pipeline in real time at the replacement and pressurization control points. It can automatically adjust the technical parameters such as the replacement gas flow rate and pressure according to the actual operation, so as to achieve precise control requirements, reduce the workload of operators, and improve operation efficiency.

[0012] To achieve the above objectives, the technical solution of this utility model is as follows: a precise control device for gas pipeline replacement and ventilation, including a replacement pressure boosting control component for real-time monitoring of gas flow rate and pressure in the main pipeline and automatic adjustment of replacement gas flow rate and pressure parameters according to actual operation conditions, and a venting control component for real-time monitoring of gas concentration in the venting pipe and ambient concentration and linked with the replacement pressure boosting control component. The replacement pressure boosting control component and the venting control component are connected to both ends of the main pipeline. When the venting control component detects that the gas concentration in the venting pipe is qualified or the ambient concentration exceeds the standard, it issues a signal to stop the replacement and ventilation operation.

[0013] This utility model discloses a precise control device for gas pipeline replacement and ventilation, wherein the replacement and pressure boosting control component includes a working pipeline and a replacement and pressure boosting control device. The working pipeline is connected between the main pipeline and the upstream pipeline, and the replacement and pressure boosting control device is installed on the working pipeline.

[0014] This utility model discloses a precise control device for gas pipeline replacement and ventilation, wherein a first bridging valve is provided between the working pipeline and the upstream pipeline, and a second bridging valve is provided between the working pipeline and the main pipeline.

[0015] This utility model discloses a precise control device for gas pipeline replacement and ventilation. The replacement and pressure boosting control device includes a first control valve, a flow rate sensor and a pressure sensor for real-time monitoring of gas flow rate and pressure in the main pipeline, and a control host for adjusting the opening of the first control valve and storing, recording and processing the received gas flow rate and pressure data. The first control valve, the flow rate sensor, the pressure sensor and the control host are installed on the working pipeline.

[0016] This utility model relates to a precise control device for gas pipeline replacement and ventilation, wherein the working pipeline is a metal corrugated flexible hose.

[0017] This utility model discloses a precise control device for gas pipeline replacement and ventilation, wherein the venting control component includes a venting pipe and a venting control device, the venting pipe is connected between the main pipeline and the downstream pipeline, and the venting control device is installed on the venting pipe.

[0018] This utility model relates to a precise control device for gas pipeline replacement and ventilation, wherein a third bridging valve is provided between the vent pipe and the main pipeline.

[0019] This utility model discloses a precise control device for gas pipeline replacement and ventilation. The venting control device includes a second control valve, multiple concentration detection probes, and a concentration signal acquisition and transmission device. The second control valve and the concentration signal acquisition and transmission device are installed on the venting pipe. Some of the concentration detection probes are installed inside the venting control device and communicate with the venting pipe, while the other concentration detection probes are installed outside the venting control device. The concentration detection probes transmit the monitored gas concentration inside the venting pipe and the ambient gas concentration to the control host of the replacement and pressurization control component through the concentration signal acquisition and transmission device.

[0020] This utility model relates to a precise control device for gas pipeline replacement and ventilation, wherein a first main valve is installed between the main pipeline and the upstream pipeline.

[0021] This utility model relates to a precise control device for gas pipeline replacement and ventilation, wherein a second main valve is installed between the main pipeline and the downstream pipeline.

[0022] After adopting the above solution, the gas pipeline replacement and ventilation precision control device of this utility model has the following beneficial effects:

[0023] 1. At the displacement and pressurization control points, the displacement and pressurization control equipment can monitor and control the gas flow rate and pressure in the main pipeline in real time. It can automatically adjust the technical parameters such as displacement gas flow rate and pressure according to the actual operation, so as to achieve the requirements of precise control, reduce the workload of operators, and improve operation efficiency.

[0024] 2. At the venting control point, the gas concentration detection in the venting pipe and the ambient concentration detection are linked with the replacement and pressurization control equipment to transmit the concentration signal to the control host. When the gas concentration in the venting pipe is within the acceptable range or the ambient concentration exceeds the standard, a signal is issued to stop the replacement and ventilation operation, thereby reducing the possibility of risks during the operation.

[0025] 3. At the replacement and pressurization control points, the replacement and pressurization control equipment can automatically design the pressurization rate of the working pipeline and control the pressurization rate according to the actual working site conditions, pipe capacity, downstream user type, etc., so as to realize real-time, flexible and accurate adjustment of the replacement gas.

[0026] 4. The displacement boost control equipment has data recording and export functions, which makes it convenient for users to observe. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of an embodiment of a gas pipeline replacement and ventilation precision control device of this utility model.

[0028] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0029] Numbering Explanation:

[0030] 1-Upstream pipeline 2-Main pipeline

[0031] 3-Downstream pipeline 4-Working pipeline

[0032] 5-First bridging valve 6-Second bridging valve

[0033] 7-Replacement pressure boosting control equipment; 8-First control valve

[0034] 9-Flow rate sensor 10-Pressure sensor

[0035] 11-First main valve 12-Second main valve

[0036] 13-Vent pipe 14-Third bridging valve

[0037] 15-Second control valve 16-Fourth bridging valve Detailed Implementation

[0038] like Figure 1 The diagram shows a structural schematic of an embodiment of a gas pipeline replacement and ventilation precision control device of this utility model. It includes a replacement pressure boosting control component and a venting control component. The replacement pressure boosting control component is used to monitor the gas flow rate and pressure in the main pipeline 2 in real time and automatically adjust the replacement gas flow rate and pressure parameters according to the actual operating conditions. The venting control component is used to monitor the gas concentration in the venting pipe 13 and the ambient concentration in real time and can be linked with the replacement pressure boosting control component. The replacement pressure boosting control component is located between the main pipeline 2 and the upstream pipeline 1, and the venting control component is located between the main pipeline 2 and the downstream pipeline 3.

[0039] The pressure boosting control assembly includes a working pipe 4, which in this embodiment is a metal corrugated flexible hose. The left end of the working pipe 4 is connected to the upstream pipe 1 via a first bridging valve 5, and the right end of the working pipe 4 is connected to the main pipe 2 via a second bridging valve 6. In this embodiment, both the first bridging valve 5 and the second bridging valve 6 are ball valves. A pressure boosting control device 7 is installed on the working pipe 4.

[0040] The displacement and pressurization control device 7 includes a first control valve 8, a flow rate sensor 9, a pressure sensor 10, and a control unit. The flow rate sensor 9 and pressure sensor 10 are used to monitor the gas flow rate and pressure in the main pipeline 2 in real time, respectively. The control unit is used to adjust the opening of the first control valve 8, receive gas flow rate and pressure data, thereby controlling the flow rate in the main pipeline 2, and storing, recording, and processing the received data. The first control valve 8, flow rate sensor 9, pressure sensor 10, and control unit are installed on the operating pipeline 4.

[0041] A first main valve 11 and a second main valve 12 are installed between the upstream pipeline 1 and the main pipeline 2, and between the main pipeline 2 and the downstream pipeline 3, respectively.

[0042] The venting control assembly includes a vent pipe 13, which is connected to the main pipeline 2 via a third bridging valve 14. A venting control device is installed on the vent pipe 13. The venting control device includes a second control valve 15, multiple concentration detection probes, and a concentration signal acquisition and transmission device. The second control valve 15 and the concentration signal acquisition and transmission device are installed on the vent pipe 13. Some concentration detection probes are installed inside the venting control device and connected to the vent pipe 13, while others are installed outside the venting control device. The concentration detection probes transmit the monitored gas concentration inside the vent pipe 13 and the ambient gas concentration outside the venting control device to the control host of the replacement and pressurization control device 7 via the concentration signal acquisition and transmission device. When the concentration detection probes detect that the gas concentration inside the vent pipe 13 is within acceptable limits, the second control valve 15 of the venting control device is closed via the control host. When the ambient concentration exceeds the limit, a signal is issued to stop the replacement and ventilation operation. The height of the concentration detection probes installed outside the venting control device should be lower than the vent outlet; they can be installed at the connection point between the vent pipe 13 and the venting control device.

[0043] A fourth bridging valve 16 is installed on the downstream pipeline 3. The fourth bridging valve 16 is kept closed throughout the entire operation. In this embodiment, both the third bridging valve 14 and the fourth bridging valve 16 are ball valves.

[0044] The present invention relates to a precise control method for the replacement and ventilation of a gas pipeline replacement and ventilation precision control device, comprising the following steps:

[0045] (1) After the equipment is installed, close the first main valve 11 and open the first bridging valve 5 and the second bridging valve 6 so that the gas flows downstream through the working pipeline 4 and the replacement pressure control device 7. The replacement pressure control device 7 controls the gas flow rate and pressure parameters of the replaced gas, controls the gas flow rate to not exceed 5m / s, and the replacement pressure to not exceed 5000Pa.

[0046] (2) Open the third bridging valve 14 and release the mixture of gas and air through the vent pipe 13. The vent control device controls the venting process. The vent pipe 13 should be more than 2m above the ground. When the gas concentration in the vent pipe 13 is detected to be greater than 90% VOL, it is the qualified standard for gas replacement (a program can be set to detect multiple times with a 5-minute interval between each test to be qualified). When the ambient gas concentration is detected to be greater than 1% VOL, the replacement pressure boosting control device 7 stops the replacement operation. After the detected concentration is qualified, the operation will automatically resume. Therefore, the alarm value can be set to 1% VOL.

[0047] (3) After the replacement is qualified, close the bleed control device and start the pressure boosting operation (boost the gas pressure in the pipeline to the pipeline operating pressure). The control host can calculate the pipeline volume based on the input information such as pipeline length and diameter, set the pressure boosting time, and adjust the gas flow rate and the opening degree of the first control valve 8 in real time according to the collected pressure information, so as to control the pressure boosting speed. Close the second jumper valve 6. When the pressure rises to 30% and 60% of the operating pressure of the working pipeline 4, stop the pressure boosting and stabilize the pressure for a predetermined time of 30 minutes respectively.

[0048] This device can also be used for pipeline withdrawal operations, that is, the operation of replacing the normal-pressure gas in the main pipeline 2 with nitrogen or air. The following are two specific embodiments of use.

[0049] Embodiment 1: Nitrogen replacement of gas operation (the gas is in the main pipeline 2, and the gas in the main pipeline 2 is replaced with nitrogen).

[0050] Connect one end of the hose of the replacement and pressure boosting control device 7 to the nitrogen gas source, and the other end to the second jumper valve 6. The first main valve 11 is in the closed state, and the first jumper valve 5 is in the closed state. Nitrogen flows through the hose and the replacement and pressure boosting control device 7 to the main pipeline 2 to replace the gas in the main pipeline 2. Similarly, the third jumper valve 14 at the bleed point is opened.

[0051] The main parameters monitored at this time include: the nitrogen injection temperature monitored at the replacement and pressure boosting control device 7 is controlled at ≥5°C; the nitrogen injection is controlled below 5000 Pa. At the bleed control device, the internal gas concentration and oxygen concentration are monitored. The gas concentration ≤1% VOL and the oxygen content ≤1% are qualified. The external environment concentration is also monitored, and ≤1% VOL is qualified.

[0052] After the replacement in the main pipeline 2 is qualified, there is no need to perform a pressure boosting operation at this time. Stop the device and close the second jumper valve 6 and the third jumper valve 14.

[0053] Embodiment 2: Nitrogen replacement of air operation (the air is in the main pipeline 2, and the air in the main pipeline 2 is replaced with nitrogen, usually for newly built pipelines).

[0054] Connect one end of the hose of the replacement and pressure boosting control device 7 to the nitrogen gas source, and the other end to the second jumper valve 6. The first main valve 11 is in the closed state, and the first jumper valve 5 is in the closed state. Nitrogen flows through the hose and the replacement and pressure boosting control device 7 to the main pipeline 2 to replace the air in the main pipeline 2. Similarly, the third jumper valve 14 at the bleed point is opened.

[0055] The main parameters monitored at this time include: the nitrogen injection temperature monitored at the replacement and pressure boosting control device 7 is controlled at ≥5°C; the nitrogen injection is controlled below 5000 Pa. At the bleed control device, the internal oxygen concentration is monitored, and the oxygen content ≤1% is qualified.

[0056] After the replacement in the main pipeline 2 is qualified, there is no need to carry out pressure increase operation. Stop the equipment and close the second bridging valve 6 and the third bridging valve 14.

[0057] This invention utilizes a displacement and pressurization control device 7 at the displacement and pressurization control points to monitor and control the gas flow rate and pressure within the main pipeline 2 in real time. It automatically adjusts technical parameters such as the displacement gas flow rate and pressure based on actual operational conditions, achieving precise control, reducing workload for operators, and improving operational efficiency. At the venting control point, the venting pressure is controlled by monitoring the venting rate and flow rate, reducing vibration and venting noise in the venting pipe 13. By linking the gas concentration detection in the venting pipe 13 and the environmental concentration detection with the displacement and pressurization control device 7, the concentration signal is transmitted to the control host. When the gas concentration in the venting pipe 13 is within acceptable limits or the external environmental concentration exceeds the standard, a signal is issued to stop the displacement and ventilation operation, reducing the possibility of risks during operation. At the displacement and pressurization control points, the displacement and pressurization control device 7 can automatically design and control the pressurization rate of the main pipeline 2 based on actual operational site conditions, pipe capacity, and downstream user type, achieving real-time, flexible, and accurate adjustment of the displacement gas. The displacement and pressurization control device 7 also has data recording and export functions for convenient user observation.

[0058] The above-described embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A precision control device for gas pipeline replacement ventilation, characterized in that, It includes a displacement pressure boosting control component for real-time monitoring of gas flow rate and pressure in the main pipeline and automatic adjustment of displacement gas flow rate and pressure parameters according to actual operation conditions, and a venting control component for real-time monitoring of gas concentration in the venting pipe and ambient concentration and linked with the displacement pressure boosting control component. The displacement pressure boosting control component and the venting control component are connected to both ends of the main pipeline. When the venting control component detects that the gas concentration in the venting pipe is qualified or the ambient concentration exceeds the standard, it issues a signal to stop the displacement ventilation operation.

2. A precise control device for replacement ventilation of a gas pipeline according to claim 1, characterized in that The displacement and pressure boosting control assembly includes a working pipeline and a displacement and pressure boosting control device. The working pipeline is connected between the main pipeline and the upstream pipeline, and the displacement and pressure boosting control device is installed on the working pipeline.

3. A precise control device for replacement ventilation of a gas pipeline according to claim 2, characterized in that A first bridging valve is provided between the working pipeline and the upstream pipeline, and a second bridging valve is provided between the working pipeline and the main pipeline.

4. The precise control device for replacement ventilation of gas pipeline according to claim 2, characterized in that, The displacement and pressurization control device includes a first control valve, a flow rate sensor and a pressure sensor for real-time monitoring of gas flow rate and pressure in the main pipeline, and a control host for adjusting the opening of the first control valve and storing, recording and processing the received gas flow rate and pressure data. The first control valve, the flow rate sensor, the pressure sensor and the control host are installed on the working pipeline.

5. The precise control device for replacement ventilation of gas pipelines as claimed in claim 2, characterized in that, The working pipeline uses a corrugated metal flexible hose.

6. The precise control device for replacement ventilation of gas pipelines as claimed in claim 1, characterized in that, The venting control assembly includes the venting pipe and the venting control device. The venting pipe is connected between the main pipeline and the downstream pipeline, and the venting control device is installed on the venting pipe.

7. A precise control device for replacement ventilation of gas pipes according to claim 6, characterized in that A third bridging valve is installed between the vent pipe and the main pipe.

8. A precise control device for replacement ventilation of a gas pipeline according to claim 6, characterized in that The venting control device includes a second control valve, multiple concentration detection probes, and a concentration signal acquisition and transmission device. The second control valve and the concentration signal acquisition and transmission device are installed on the venting pipe. Some of the concentration detection probes are installed inside the venting control device and communicate with the venting pipe, while the other concentration detection probes are installed outside the venting control device. The concentration detection probes transmit the monitored concentration of the ambient gas in the venting pipe to the control host of the displacement boosting control component through the concentration signal acquisition and transmission device.

9. The precise control device for replacement ventilation of gas pipelines as claimed in claim 1, characterized in that, A first main valve is installed between the main pipeline and the upstream pipeline.

10. The precise control device for replacement ventilation of gas pipelines as claimed in claim 1, characterized in that, A second main valve is installed between the main pipeline and the downstream pipeline.

Images