Automatic drainage and leakage prevention system for underpass type inlet and outlet pipeline of coal gas tank

Abstract

The utility model relates to industrial coal gas processing technical field. A kind of coal gas holder underwear type import and export pipeline automatic drainage leakproof system, including sink (2), catch basin (6), drainage pump (5), anti-leakage device (1) and flow guide pipe (8), the bottom of the U-shaped pipeline (4) of coal gas holder underwear type import and export pipeline (7) is connected sink (2) by flow guide pipe and anti-leakage device (1), water level detection device (3) is installed in sink (2), sink (2) is connected catch basin (6) by flow guide pipe and drainage pump (5), water level detection device (3) electric signal connects drainage pump (5). The utility model systematically integrates drainage pump, sink and water level detection device, forms a complete set of automatic drainage process.

Description

Technical Field

[0001] This utility model relates to the field of industrial gas treatment technology. Background Technology

[0002] In traditional gas handling processes, the inlet and outlet pipes of the gas holder typically employ an underpass U-shaped structure design. However, due to the saturated state of the gas, moisture easily accumulates at the bottom of the U-shaped pipe. Constrained by site space layout and operating environment, traditional vertical or horizontal water seal drainage devices are difficult to install, thus relying heavily on manual drainage operations. This method not only increases the labor intensity and risk exposure of operators but also poses multiple hidden dangers, including the risk of poisoning, disruption of system stability, and degradation of gas quality. Specifically: 1. Space limitations: Traditional water seal devices are limited by installation space requirements and cannot be deployed in narrow basement environments.

[0003] 2. Safety hazards: Manual drainage operations pose a significant safety hazard of CO poisoning (according to industry statistics, 83% of gas operation accidents are poisoning accidents).

[0004] 3. System instability: Non-automatic drainage systems lead to unstable drainage cycles and are prone to water seal effects (which occur when the water level exceeds 15% of the pipe diameter).

[0005] 4. Deterioration in gas quality: The water content of the gas fluctuates within a range of ±20%, which seriously affects the stability of subsequent processes. Utility Model Content

[0006] The technical problem to be solved by this utility model is: how to realize automatic drainage of the inlet and outlet pipes of the gas holder underpass, eliminate the safety hazards in the process of manual drainage, and ensure the stable operation of the gas system and the continuous improvement of gas quality.

[0007] The technical solution to be adopted by this utility model is: an automatic drainage and leakage prevention system for gas holder underpass inlet and outlet pipes, including a water tank (2), a water collection pit (6), a drainage pump (5), a leakage prevention device (1) and a guide pipe (8). The bottom of the U-shaped pipe (4) of the gas holder underpass inlet and outlet pipe (7) is connected to the water tank (2) through the guide pipe and the leakage prevention device (1). A water level detection device (3) is installed in the water tank (2). The water tank (2) is connected to the water collection pit (6) through the guide pipe and the drainage pump (5). The water level detection device (3) is electrically connected to the drainage pump (5).

[0008] The gas holder underpass inlet and outlet pipe (7) is equipped with a gas alarm device (9) near the U-shaped pipe (4). The gas alarm device (9) is electrically connected to a manned control room or dispatch center.

[0009] A time relay control valve (10) is installed on the guide pipe connected to the leak prevention device (1).

[0010] The leak prevention device (1) is a two-way pressure regulating valve.

[0011] This invention integrates a leak-proof device based on the pressure balance principle at the end of the drain pipe at the bottom of the U-shaped inlet and outlet pipes of the gas holder. This device effectively blocks the leakage path of the water-gas mixture through a precise sealing structure and pressure balance mechanism, ensuring environmental safety. Its structure includes a two-way pressure regulating valve with a working pressure range of 0.05-0.15 MPa, and its principle is based on the hydrostatic equation ΔP=ρgh to achieve dynamic sealing.

[0012] This invention systematically integrates a drainage pump, a water tank, and a water level detection device to form a complete automated drainage process. The drainage pump is deployed on the ground above the water tank chamber, while the water tank is located underground, with the two seamlessly connected via a leak-proof device. The water tank has built-in high and low level floats for positioning (high and low level settings of the water level detection device). The rise and fall of the water level inside the tank triggers the start and stop of the drainage pump, achieving precise water level control and automated discharge. The drainage system is controlled by an explosion-proof submersible pump (Q=5m³ / h, H=15m) and a magnetostrictive level sensor (accuracy ±1mm), with the magnetostrictive level sensor connected to the floats.

[0013] Gas detectors are installed near the inlet and outlet pipes of the gas holder to monitor the gas concentration in real time and issue an alarm signal when the gas concentration exceeds the standard. The alarm signal is transmitted remotely to a 24-hour manned control room or dispatch center via wired or wireless means to ensure that safety hazards such as gas leaks can be detected and dealt with in a timely manner.

[0014] The beneficial effects of this utility model are: 1. Significantly improve safety. Through the integrated application of automated drainage and leak prevention technologies, as well as the newly added gas alarm and remote transmission system, the risk of personnel poisoning in gas drainage operations is fundamentally eliminated, and the safety of the working environment is significantly improved.

[0015] 2. Enhanced system stability: The implementation of the automated drainage system ensures timely removal of water accumulation in the pipes, effectively preventing water seal and thus guaranteeing the stable operation of the gas system.

[0016] 3. Optimize gas quality by reducing water accumulation in pipelines, effectively lowering the moisture content in the gas, and further improving the purity and combustion efficiency of the gas.

[0017] 4. Enhance the level of intelligent management. The application of automation technology not only reduces the labor intensity of operators, but also improves the level of intelligence and automation in the gas processing process, providing strong support for the company's refined management.

[0018] 5. Real-time monitoring and response: The addition of a gas alarm and remote transmission system enables real-time monitoring and rapid response to gas concentration, further enhancing on-site safety. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model; Among them, 1. Leakage prevention device, 2. Water tank, 3. Water level detection device, 4. U-shaped pipe, 5. Drain pump, 6. Water collection pit, 7. Underpass inlet and outlet pipes of gas holder, 8. Diversion pipe, 9. Gas alarm device, 10. Time relay control valve. Detailed Implementation

[0020] like Figure 1 As shown, an automatic drainage and leak-proof system for underpass inlet and outlet pipes of a gas holder includes a water tank 2, a sump 6, a drainage pump 5, a leak-proof device 1, and a guide pipe 8. The water tank 2 is a covered water tank, and the cover of the water tank has a gas outlet. The leak-proof device 1 is a two-way pressure regulating valve.

[0021] The bottom of the U-shaped pipe 4 of the gas holder's underpass inlet / outlet pipe 7 is connected to the water tank 2 via a guide pipe and a leak-proof device 1. The water tank 2 is horizontally located below the U-shaped pipe 4, allowing water to flow directly into it under gravity. In one embodiment, the water tank 2 is located below ground level. The water tank 2 can also be located in a basement.

[0022] A water level detection device 3 is installed in the water tank 2. In one embodiment, the water level detection device 3 includes a float and a magnetostrictive liquid level sensor. The magnetostrictive liquid level sensor detects changes in the float, and the float has upper and lower limits. The upper and lower limits are used to determine whether to start the drain pump 5.

[0023] Water tank 2 is connected to water collection pit 6 via a guide pipe and drainage pump 5. Water level detection device 3 is electrically connected to drainage pump 5. When the float is detected to be at the upper limit, drainage pump 5 is started to drain water; when the float is detected to be at the lower limit, drainage pump 5 is stopped to drain water.

[0024] A gas alarm device 9 is installed near the U-shaped pipe 4 on the underpass inlet and outlet pipe 7 of the gas holder. The gas alarm device 9 is electrically connected to a manned control room or dispatch center.

[0025] A time relay control valve 10 is installed on the guide pipe connected to the leak prevention device 1.

[0026] The leak prevention device 1 is a two-way pressure regulating valve.

[0027] The time relay-controlled valve 10 includes a time relay and an electromagnetic control valve connected in series. The time relay is set to activate at regular intervals; for example, it activates for 5 minutes every 4 hours. The time relay and the electromagnetic control valve are connected in series to a power source. Using the time relay-controlled valve 10 can further reduce air leakage.

[0028] This invention can be controlled as a whole by a PLC. This requires the water level detection device 3, the drainage pump 5, and the time relay control valve 10 to be connected to the PLC. When using the PLC, the time relay control valve 10 can be a standard solenoid valve, with time control achieved through the PLC.

[0029] In one embodiment, the process is as follows.

[0030] 1. System startup: Once the system is powered on, the entire control logic begins to start.

[0031] 2. Water level monitoring: (1) The system first monitors the water level in the tank through a magnetostrictive liquid level sensor.

[0032] (2) Transmit the real-time water level data to the PLC controller.

[0033] 3. Water level assessment: (1) The PLC controller judges the received water level data according to the preset water level threshold (high level and low level).

[0034] (2) If the water level is higher than the high threshold or lower than the low threshold, proceed to the next step; otherwise, the system continues to monitor the water level.

[0035] 4. Drainage control: (1) When the water level is higher than the high threshold, the PLC controller issues a command to start the drainage pump.

[0036] (2) The drainage pump starts working, drawing water from the water tank and discharging it into the sump.

[0037] (3) At the same time, the PLC controller records the drainage start time and starts the timer to monitor the drainage process.

[0038] 5. Water level re-inspection: (1) During the drainage process, the system continuously monitors the water level.

[0039] (2) Once the water level drops below the low threshold, the PLC controller issues a command to stop the drainage pump.

[0040] (3) The drainage pump stops working and the drainage process ends.

[0041] 6. Drainage response time record: (1) The PLC controller records the total time from starting the drainage pump to stopping the drainage pump, i.e., the drainage response time.

[0042] (2) This data can be used for subsequent system performance analysis and optimization.

[0043] 7. Gas concentration monitoring: Throughout the process, the gas alarm continuously monitors the gas concentration near the inlet and outlet pipes of the gas holder.

[0044] 8. Gas concentration judgment and alarm: (1) If the gas concentration exceeds the preset alarm threshold, the gas alarm will immediately issue an audible and visual alarm signal.

[0045] (2) The alarm signal is transmitted remotely to the 24-hour manned control room or dispatch center via wired or wireless means.

[0046] 9. System monitoring and anomaly handling: (1) The PLC controller continuously monitors the working status of each component of the system.

[0047] (2) If any abnormality is detected (such as sensor failure, drainage pump failure, etc.), the system will automatically enter the abnormality handling mode and issue a corresponding alarm signal.

[0048] 10. System Standby: (1) When there is no water accumulation to be treated and the gas concentration is normal, the system enters standby mode.

[0049] (2) The system continues to monitor the water level and gas concentration, and waits for the next operation instruction.

[0050] The control logic flowchart reflects the high level of automation and intelligence of the system. Through precise water level monitoring, rapid drainage response, and real-time gas concentration monitoring and alarm mechanisms, the safe and stable operation of the gas holder inlet and outlet pipelines is ensured.

[0051] Specific parameter configuration: Piping configuration: Drainage pipe diameter: DN150.

[0052] Water tanks and sump pits: Water tank volume: 2m³, made of 316L stainless steel, which is highly corrosion resistant and ensures long-term stable operation.

[0053] The sump has a volume of 10m³ and is reasonably designed to effectively contain and collect water from the pipes.

[0054] Drainage system: Drainage pump: Explosion-proof submersible pump with a flow rate of 1.5 m³ / h and a head of 15 m is selected, which is suitable for complex environments such as basements.

[0055] Water level sensor: Employs a magnetostrictive liquid level sensor with an accuracy of ±1mm, enabling precise monitoring and control of water level.

[0056] Control system: PLC controller: adopts Siemens S7-1200 series, which is stable in performance, flexible in programming, and easy to realize automated control.

[0057] Control strategy: An intermittent drainage control strategy based on PID regulation, combined with a fuzzy PID algorithm (setting PID parameters Kp=0.8, Ki=0.05), is used to achieve closed-loop control of the system with a response time of <0.5 seconds.

[0058] Installation and debugging process: Leakage prevention device integration: The leakage prevention device is integrated and its sealing performance is tested in strict accordance with the design requirements to ensure that the device can effectively block the leakage path of the water and gas mixture.

[0059] Automated drainage system layout: Based on the actual site conditions, the drainage pumps, water tanks, and float sensors are rationally arranged to ensure a smooth and unobstructed drainage flow. Simultaneously, the drainage system is debugged to ensure the accuracy of the drainage pumps' start-up and shutdown.

[0060] Gas alarm and remote transmission system installation: Install gas alarms near the inlet and outlet pipes of the gas holder and connect them to a 24-hour manned control room or dispatch center. Verify the accuracy and response speed of the alarm signal transmission through simulation testing.

[0061] Overall system debugging: After the installation of each component is completed, the entire system is debugged. By simulating operation under different working conditions, control parameters are adjusted to ensure stable, safe and reliable system performance.

[0062] Implementation effect

[0063] By implementing this utility model, the drainage and leakage prevention problems of a certain gas holder have been effectively solved. Specifically, the following is achieved: 1. The leakage rate was reduced to below 0.01 m³ / h, significantly reducing the risk of gas leakage.

[0064] 2. The drainage response time is less than 30 seconds, ensuring the timely removal of water accumulation in the pipes.

[0065] 3. The water content of the gas is stable at 4.5±0.3g / m³, which meets the national standard and improves the quality of the gas.

[0066] 4. It has achieved automated and intelligent management of the working environment, reducing the labor intensity of operators.

Claims

1. An automatic drainage and leak prevention system for gas holder underpass inlet and outlet pipelines, characterized in that: Includes a water tank (2), a sump (6), a drain pump (5), a leak prevention device (1), and a guide pipe (8). The bottom of the U-shaped pipe (4) of the gas holder underpass inlet and outlet pipe (7) is connected to the water tank (2) through the guide pipe and the leak prevention device (1). A water level detection device (3) is installed in the water tank (2). The water tank (2) is connected to the sump (6) through the guide pipe and the drain pump (5). The water level detection device (3) is electrically connected to the drain pump (5).

2. The automatic drainage and leak prevention system for underpass inlet and outlet pipelines of a gas holder according to claim 1, characterized in that: The gas holder underpass inlet and outlet pipe (7) is equipped with a gas alarm device (9) near the U-shaped pipe (4). The gas alarm device (9) is electrically connected to a manned control room or dispatch center.

3. The automatic drainage and leak prevention system for underpass inlet and outlet pipelines of a gas holder according to claim 1, characterized in that: A time relay control valve (10) is installed on the guide pipe connected to the leak prevention device (1).

4. The automatic drainage and leak prevention system for underpass inlet and outlet pipelines of a gas holder according to claim 1, characterized in that: The leak prevention device (1) is a two-way pressure regulating valve.

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