A positive and negative pressure full-working-condition high-efficiency liquid discharge system
By designing a high-efficiency drainage system under both positive and negative pressure conditions, and utilizing high-pressure gas to control the pressure difference in the liquid accumulation area and automatic sensor control, the problem of air backflow in traditional sewage discharge processes has been solved, achieving efficient sewage discharge and equipment safety under different pressure conditions.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHONGQING OPRO ENERGY TECH CO LTD
- Filing Date
- 2025-10-09
- Publication Date
- 2026-08-04
AI Technical Summary
In the existing natural gas pipeline transportation process, the traditional sewage discharge process is only applicable when the gas source pressure inside the pipeline is greater than the standard atmospheric pressure. When the gas source pressure is less than or equal to atmospheric pressure, air backflow will occur, causing safety accidents.
Design a high-efficiency liquid drainage system with positive and negative pressure under all working conditions, including a filter, a drain valve, a liquid accumulation zone, a first ball valve, and a second ball valve. The system uses high-pressure gas to control the pressure difference in the liquid accumulation zone to achieve the discharge of dirt. It is equipped with liquid level and pressure sensors for automatic control and combines manual and automatic drain modes to adapt to different working conditions.
It achieves efficient sewage discharge under all operating conditions of positive and negative pressure, prevents air backflow, shortens sewage discharge time, reduces safety risks, and ensures stable equipment operation.
Smart Images
Figure CN224593094U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of natural gas sewage discharge technology, and in particular to a high-efficiency liquid discharge system under both positive and negative pressure conditions. Background Technology
[0002] During natural gas pipeline transportation, filters are used to remove impurities from the gas source to ensure the normal operation of downstream equipment. Traditional wastewater treatment processes rely primarily on pressure differentials to expel impurities from the filter. However, this old process has significant drawbacks, only applicable when the gas pressure inside the pipeline is greater than atmospheric pressure. When the gas pressure inside the pipeline is less than or equal to atmospheric pressure, opening the ball valve not only fails to expel impurities from the filter but also allows outside air to be drawn into the pipeline, causing natural gas to mix with air. This can easily lead to safety accidents and poses a significant threat to the safe operation of natural gas pipelines.
[0003] Therefore, to address the above shortcomings, a high-efficiency drainage system under both positive and negative pressure conditions is needed. Utility Model Content
[0004] (a) Technical problems to be solved The technical problem to be solved by this utility model is that the existing sewage discharge process is only applicable to the working condition where the internal air source pressure of the pipeline is greater than the standard atmospheric pressure. When the internal air source pressure is less than or equal to the atmospheric pressure, air backflow will occur, causing safety accidents.
[0005] (II) Technical Solution To solve the above-mentioned technical problems, this utility model provides a high-efficiency liquid drainage system under both positive and negative pressure conditions, including a filter, a drain valve, a liquid accumulation zone, a first ball valve, and a second ball valve. The drain end of the filter is connected to the drain valve through a pipe, and the liquid accumulation zone is connected to the drain valve through a pipe to store the liquid dirt filtered out by the filter. The first ball valve is connected to the drain valve and the liquid accumulation zone through a pipe to introduce high-pressure gas connected to the filter into the liquid accumulation zone. The second ball valve is connected to the outlet end of the liquid accumulation zone through a pipe to discharge the high-pressure gas and liquid dirt from the liquid accumulation zone.
[0006] As a further explanation of this utility model, preferably, the air inlet end of the first ball valve and the air inlet end of the filter are connected by a pipeline.
[0007] As a further explanation of this utility model, preferably, a pressure regulating valve is connected to the pipeline between the first ball valve and the liquid accumulation area to stabilize the gas source pressure between 0.1MPa and 5MPa.
[0008] As a further explanation of this utility model, preferably, the outlet end of the second ball valve is connected to a check valve via a pipeline.
[0009] As a further explanation of this utility model, preferably, the sealing surface of the one-way valve is a conical surface with a taper of 30°, and the one-way valve diameter is DN25 to increase the flow rate to 12m³. 3 / h.
[0010] As a further explanation of this utility model, preferably, a liquid level sensor is installed in the liquid accumulation area, and a pressure sensor is installed in both the filter and the liquid accumulation area. Both the liquid level sensor and the pressure sensor are electrically connected to the control system, and the control system is electrically connected to the drain valve, the first ball valve, and the second ball valve, respectively.
[0011] As a further explanation of this utility model, preferably, the filter includes a main filter and a secondary filter, both of which are connected to the main pipeline. The liquid outlet of the main filter is connected to the drain valve through a first manual valve and a pipeline, and the liquid outlet of the secondary filter is connected to the drain valve through a second manual valve and a pipeline. Only one of the first manual valve and the second manual valve is open or both are closed.
[0012] As a further explanation of this utility model, preferably, a third manual valve is connected in parallel to the outside of the drain valve via a pipeline, a first replacement valve is connected in parallel to the outside of the first ball valve via a pipeline, and a second replacement valve is connected in parallel to the outside of the second ball valve via a pipeline; when repairing the drain valve, the first ball valve, and the second ball valve, the third manual valve, the first replacement valve, and the second replacement valve are opened.
[0013] As a further explanation of this utility model, preferably, a fourth manual valve is fixedly connected to the pipeline between the liquid accumulation area and the second ball valve for manual opening to drain and clean.
[0014] (III) Beneficial Effects The above-mentioned technical solution of this utility model has the following advantages: This novel sewage discharge system is suitable not only for operating conditions where the internal gas source pressure is greater than atmospheric pressure, but also for operating conditions where the internal gas source pressure is less than or equal to atmospheric pressure, achieving efficient sewage discharge under both positive and negative pressure conditions. Furthermore, when the internal gas source pressure is less than or equal to atmospheric pressure, the one-way valve effectively prevents external air from backflowing and mixing with the natural gas inside the pipeline, avoiding safety accidents. Moreover, by introducing a high-pressure gas source from the high-pressure section of the pipeline, the pressure in the liquid accumulation area is increased, creating a pressure difference that thoroughly removes the dirt from the liquid accumulation area, ensuring effective sewage discharge. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the system piping of this utility model.
[0016] In the diagram: 1. Filter; 11. Main filter; 12. Secondary filter; 13. First manual valve; 14. Second manual valve; 15. Pressure regulating valve; 16. Third manual valve; 2. Drain valve; 3. Liquid accumulation area; 4. First ball valve; 41. First replacement valve; 5. Second ball valve; 51. Second replacement valve; 52. Fourth manual valve; 6. Check valve. Detailed Implementation
[0017] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0018] A high-efficiency drainage system under both positive and negative pressure conditions, such as Figure 1 As shown, the system includes a filter 1, a drain valve 2, a liquid accumulation zone 3, a first ball valve 4, and a second ball valve 5. The drain end of the filter 1 is connected to the drain valve 2 via a pipe, and the liquid accumulation zone 3 is connected to the drain valve 2 via a pipe to store the liquid dirt filtered out by the filter 1. The first ball valve 4 is connected to the pipe connecting the drain valve 2 and the liquid accumulation zone 3 via a pipe, and the second ball valve 5 is connected to the outlet end of the liquid accumulation zone 3 via a pipe.
[0019] like Figure 1As shown, filter 1 includes a main filter 11 and a secondary filter 12. Both the main filter 11 and the secondary filter 12 are connected to the main pipeline. The liquid outlet of the main filter 11 is connected to the drain valve 2 via a first manual valve 13 and a pipeline. The liquid outlet of the secondary filter 12 is connected to the drain valve 2 via a second manual valve 14 and a pipeline. Only one of the first manual valve 13 and the second manual valve 14 is open, or both are closed. By setting two sets of parallel filters 1 in conjunction with the first manual valve 13 and the second manual valve 14, alternating sewage discharge can be achieved, enabling filtration and sewage discharge without stopping the machine. An air inlet pipe is fixedly connected to the air inlet of filter 1 to introduce natural gas to be cleaned into filter 1. A high-pressure pipe is connected to the first ball valve 4. The air inlet pipe is connected to the high-pressure pipe to introduce high-pressure gas into the liquid accumulation area 3. A pressure regulating valve 15 is connected to the high-pressure pipe. Opening the pressure regulating valve 15 balances the pressure between the liquid accumulation tank and the filter to stabilize the gas source pressure between 0.1MPa and 5MPa. A gas outlet pipe is fixedly connected to the outlet end of filter 1 to discharge filtered natural gas. A drain pipe is connected to the outlet end of the second ball valve 5, and a one-way valve 6 is connected between the second ball valve 5 and the drain pipe. The sealing surface of the one-way valve 6 is a 30° tapered surface, the valve diameter is DN25, and it uses a fluororubber sealing ring resistant to natural gas corrosion. The sealing pressure can reach 0.5MPa, and the air backflow rate is controlled below 0.01L / min, further reducing safety risks. Furthermore, at a pressure difference of 0.2MPa, the flow rate is controlled from 8m³ / min. 3 / h increased to 12m 3 / h, shortening sewage discharge time and improving sewage discharge efficiency.
[0020] During normal operation, the first ball valve 4 and the second ball valve 5 are closed, and the drain valve 2 is open. At this time, the pressure inside the filter 1 and the liquid accumulation zone 3 are in a state of pressure equilibrium. Regardless of whether the pressure inside the pipeline is greater than, less than, or equal to atmospheric pressure, the pressure in the filter 1 and the liquid accumulation zone 3 is equal, or may both be greater than atmospheric pressure, or both may be less than or equal to atmospheric pressure. Under the action of gravity, the dirt on the surface of the filter element inside the filter 1 enters the liquid accumulation zone 3 through the open drain valve 2 and is deposited.
[0021] Once the preset drainage time is reached, the drainage operation begins. First, drain valve 2 is closed to disconnect the liquid accumulation zone 3 from filter 1, preventing gas and dirt in filter 1 from affecting the drainage process of liquid accumulation zone 3. Next, the first ball valve 4 is opened, allowing high-pressure air from the intake pipe to be introduced into liquid accumulation zone 3 through the high-pressure pipe, gradually increasing the pressure in liquid accumulation zone 3 until it exceeds atmospheric pressure. Then, the second ball valve 5 is opened. Because the pressure in liquid accumulation zone 3 is greater than atmospheric pressure, the dirt in liquid accumulation zone 3 will be smoothly discharged from the second ball valve 5 through the one-way valve 6 to the outside of the pipe under the action of the pressure difference.
[0022] After the dirt inside the pipeline is drained, close the first ball valve 4 and the second ball valve 5 in sequence to cut off the supply of high-pressure air and seal the sewage discharge channel. Finally, open the sewage discharge valve 2 to reconnect the inside of the filter 1 with the liquid accumulation area 3, restore normal operation, and start the next sewage discharge cycle.
[0023] Furthermore, a level sensor can be installed in the liquid accumulation zone 3, and a pressure sensor is installed in both the filter 1 and the liquid accumulation zone 3. Both the level sensor and the pressure sensor are electrically connected to the control system, which is electrically connected to the drain valve 2, the first ball valve 4, and the second ball valve 5, respectively. When the level sensor detects that the liquid volume reaches 60% of the volume of the liquid accumulation zone 3, or when the pressure sensor detects that the internal pressure of the filter is below -0.05 MPa for 10 minutes, the drain process is automatically triggered, eliminating the need for manual setting of a fixed time and reducing energy waste and equipment wear.
[0024] The pressure regulating valve 15 on the high-pressure pipe can also form a closed-loop control with the pressure sensor in the accumulating zone 3. When the pressure in the accumulating zone 3 is lower than the target value of 0.2 MPa, the pressure regulating valve 15 automatically opens wider to increase the air supply; when the pressure reaches the target value, the pressure regulating valve 15 remains stable to avoid overpressure. In addition, for the condition that the initial pressure in the accumulating zone 3 is too low (e.g., -0.08 MPa), a staged pressure increase strategy can be adopted: the first stage increases the pressure to -0.02 MPa at a rate of 0.05 MPa / min, the second stage increases it to 0.1 MPa at a rate of 0.1 MPa / min, and the final stage increases it to 0.2 MPa at a rate of 0.05 MPa / min, to avoid the sudden pressure increase from impacting the seals and pipe interfaces in the accumulating zone 3.
[0025] like Figure 1 As shown, further, a third manual valve 16 is connected in parallel to the drain valve 2 via a pipeline, a first replacement valve 41 is connected in parallel to the first ball valve 4 via a pipeline, and a second replacement valve 51 is connected in parallel to the second ball valve 5 via a pipeline. The third manual valve 16, the first replacement valve 41, and the second replacement valve 51 are all manual valves. When the automatic control malfunctions, the third manual valve 16, the first replacement valve 41, and the second replacement valve 51 can be manually opened to ensure that filtration and draining operations can continue smoothly. Simultaneously, drain valve 2, the first ball valve 4, and the second ball valve 5 can be inspected and repaired. After the inspection and repair are completed, the third manual valve 16, the first replacement valve 41, and the second replacement valve 51 can be opened and closed, achieving maintenance without shutting down the system. A fourth manual valve 52 is fixedly connected to the pipeline between the liquid accumulation area 3 and the second ball valve 5 for manual opening for draining and cleaning. This fourth manual valve 52 and the second replacement valve 51 can also be opened to ensure normal draining operations in the event of a malfunction in the second ball valve 5.
[0026] This utility model selects three typical working conditions: 1. Positive pressure condition: Internal pressure of filter 1 is 0.3 MPa; 2. Normal pressure condition: Internal pressure of filter 1 is 0.1 MPa; 3. Negative pressure condition: Internal pressure of filter 1 is -0.05MPa. The configured periodic triggering mechanism is 24 hours to ensure that the filter is regularly drained to avoid the accumulation and blockage of impurities. During operation, the fixed sequence of "shutdown → drain → restore" must be strictly followed. Each step is based on the premise that "the preceding valve is in place". For example, the first ball valve 4 is opened only after the drain valve 2 is closed to avoid media leakage or abnormal pressure. In the pressure balancing process, opening the pressure regulating valve 15 first can further reduce system impact and protect the equipment.
[0027] The optimized solution was compared with the traditional old process, and the data is shown in the table below:
[0028] In summary, the system provided by this invention, which can perform both automatic and manual drainage, reduces the drainage time by 62.5% compared to traditional processes under positive pressure and also achieves rapid drainage under negative pressure. It completely solves the problem of traditional processes being unable to drain wastewater. Simultaneously, the amount of residual liquid is significantly reduced, ensuring long-term stable operation of the equipment. Air backflow is minimal under all operating conditions, greatly reducing the risk of safety accidents caused by the mixing of natural gas and air. The new drainage process can safely and efficiently complete the filter drainage work under various pressure conditions, effectively solving the defects of the old drainage process. Furthermore, it can freely switch to manual control when the automatic system malfunctions, ensuring that the filtration-drainage operation can continue without interruption, guaranteeing work efficiency.
[0029] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.
Claims
1. A positive and negative pressure full working condition high efficiency liquid discharge system, characterized in that: Includes a filter (1), a drain valve (2), a liquid accumulation area (3), a first ball valve (4), and a second ball valve (5). The drain end of the filter (1) is connected to the drain valve (2) through a pipe. The liquid accumulation area (3) is connected to the drain valve (2) through a pipe to store the liquid dirt filtered out by the filter (1). The first ball valve (4) is connected to the pipe connected to the drain valve (2) and the liquid accumulation area (3) through a pipe to introduce the high-pressure gas connected to the filter (1) into the liquid accumulation area (3). The second ball valve (5) is connected to the outlet end of the liquid accumulation area (3) through a pipe to discharge the high-pressure gas and liquid dirt out of the liquid accumulation area (3).
2. The positive and negative pressure full-working-condition high-efficiency liquid drainage system according to claim 1, characterized in that: The inlet end of the first ball valve (4) is connected to the inlet end of the filter (1) through a pipe.
3. The positive and negative pressure full-working-condition high-efficiency liquid drainage system according to claim 2, characterized in that: A pressure regulating valve (15) is connected to the pipeline between the first ball valve (4) and the liquid accumulation area (3) to stabilize the gas source pressure between 0.1MPa and 5MPa.
4. The positive and negative pressure full-working-condition high-efficiency liquid drainage system according to claim 3, characterized in that: The outlet end of the second ball valve (5) is connected to a check valve (6) via a pipeline.
5. The positive and negative pressure full-working-condition high-efficiency liquid drainage system according to claim 4, characterized in that: The sealing surface of the one-way valve (6) is a taper surface with a taper of 30°, and the one-way valve (6) has a DN25 passage diameter so that the flow rate is increased to 12 m 3 / h.
6. The high-efficiency drainage system under all positive and negative pressure conditions according to claim 1, characterized in that: A liquid level sensor is installed in the liquid accumulation area (3), and a pressure sensor is installed in both the filter (1) and the liquid accumulation area (3). The liquid level sensor and the pressure sensor are electrically connected to the control system. The control system is electrically connected to the drain valve (2), the first ball valve (4), and the second ball valve (5), respectively.
7. The positive and negative pressure full-working-condition high-efficiency liquid drainage system according to claim 1, characterized in that: The filter (1) includes a main filter (11) and a secondary filter (12). Both the main filter (11) and the secondary filter (12) are connected to the main pipeline. The liquid outlet of the main filter (11) is connected to the drain valve (2) through the first manual valve (13) and the pipeline. The liquid outlet of the secondary filter (12) is connected to the drain valve (2) through the second manual valve (14) and the pipeline. Only one of the first manual valve (13) and the second manual valve (14) is open or both are closed.
8. The positive and negative pressure full-working-condition high-efficiency liquid drainage system according to claim 7, characterized in that: A third manual valve (16) is connected in parallel through a pipe to the outside of the drain valve (2), a first replacement valve (41) is connected in parallel through a pipe to the outside of the first ball valve (4), and a second replacement valve (51) is connected in parallel through a pipe to the outside of the second ball valve (5). When overhauling the drain valve (2), the first ball valve (4), and the second ball valve (5), the third manual valve (16), the first replacement valve (41), and the second replacement valve (51) are opened.
9. The positive and negative pressure full-working-condition high-efficiency liquid drainage system according to claim 8, characterized in that: A fourth manual valve (52) is fixedly connected to the pipeline between the liquid accumulation area (3) and the second ball valve (5) for manual opening to drain and clean.