A structure and method for online water level monitoring of gas pipeline water seal

Abstract

The present invention provides a structure and method for online water level monitoring of a gas pipeline water seal, comprising a liquid level meter and a gas pipeline. A U-shaped gas pipeline water seal section is provided on the gas pipeline, a vertical distance between a highest liquid level point and a lowest liquid level point of the gas pipeline water seal section is a water seal height, a water supply pipeline is connected with the highest liquid level point of the gas pipeline water seal section, the gas pipeline water seal section is connected with a gas drainage sealing tank through a first drainage pipeline, the gas drainage sealing tank is connected with an overflow pipe through a second drainage pipeline, the first drainage pipeline is parallel to the second drainage pipeline, the second drainage pipeline and the overflow pipe form an inverted U-shaped structure, the highest liquid level point of the overflow pipe is at the same height as the highest liquid level point of the gas pipeline water seal section, the liquid level meter is connected with the top of the second drainage pipeline through two liquid level meter connecting valves, one liquid level meter connecting valve is at the same height as the highest liquid level point of the gas pipeline water seal section, and the other liquid level meter connecting valve is at the same height as the lowest liquid level point of the gas pipeline water seal section.

Description

Technical Field

[0001] The invention relates to the field of gas pipeline water seal liquid level monitoring, and in particular to a structure and method for online water level monitoring of a gas pipeline water seal. Background Art

[0002] Many gas pipes in steel enterprises use water seal + blind plate partition devices, and such gas pipes rarely have gas outages due to production reasons. Most existing gas pipeline water seals are generally not equipped with water seal level monitoring devices. If the water seal level is low or the water seal is punctured due to gas pressure fluctuations, it may cause gas leakage risks of varying degrees and lead to the possibility of operator poisoning. Similar cases have occurred in domestic enterprises. Therefore, it is particularly important to add water level monitoring to the existing gas pipeline water seals. Summary of the invention

[0003] The purpose of the present invention is to overcome the defects of the prior art and provide a structure and method for online water level monitoring of the water seal of a gas pipeline. The present invention at least solves some of the problems in the prior art.

[0004] The present invention is achieved in that:

[0005] The present invention provides a structure for online water level monitoring of a gas pipeline water seal, comprising a liquid level meter and a gas pipeline for conveying gas to users, wherein a U-shaped gas pipeline water seal section is provided on the gas pipeline, a vertical distance between a highest liquid level point of the gas pipeline water seal section and a lowest liquid level point of the gas pipeline water seal section is a water seal height, a water supply pipeline is connected with the highest liquid level point of the gas pipeline water seal section, the gas pipeline water seal section is connected with a gas drainage sealing tank through a first drainage pipeline, the gas drainage sealing tank is connected with an overflow pipe through a second drainage pipeline, the first drainage pipeline is parallel to the second drainage pipeline, the second drainage pipeline and the overflow pipe form an inverted U-shaped structure, the highest liquid level point of the overflow pipe is at the same height as the highest liquid level point of the gas pipeline water seal section, the liquid level meter is connected with the top of the second drainage pipeline through two liquid level meter connecting valves, one liquid level meter connecting valve is at the same height as the highest liquid level point of the gas pipeline water seal section, and the other liquid level meter connecting valve is at the same height as the lowest liquid level point of the gas pipeline water seal section.

[0006] Furthermore, the first drainage pipe is provided with a first drainage gate valve and a second drainage gate valve.

[0007] Furthermore, the structure for increasing water level monitoring online for the gas pipeline water seal also includes a collecting pool, and the second drainage pipe and the overflow pipe are both connected to the collecting pool.

[0008] Furthermore, a third drainage gate valve is provided on the connecting pipeline between the second drainage pipe and the collection tank.

[0009] Furthermore, a purge valve is provided on the gas pipeline.

[0010] Furthermore, a U-shaped buffer pipe section is provided on the water supply pipeline, and the height of the buffer pipe in the vertical direction is the same as the water seal height.

[0011] The present invention also provides a method for online water level monitoring of a gas pipeline water seal, comprising the following steps:

[0012] S1. When there is no need to stop the gas supply, close the first drain gate valve, the second drain gate valve, and the third drain gate valve, and add a level gauge online, that is, construct a level gauge and a level gauge connecting valve online, so that the level gauge is connected to the top of the second drain pipe through two level gauge connecting valves, one level gauge connecting valve is at the same height as the highest point of the liquid level in the water seal section of the gas pipeline, and the other level gauge connecting valve is at the same height as the lowest point of the liquid level in the water seal section of the gas pipeline;

[0013] S2. After adding a liquid level gauge online, when the gas pipeline stops transporting gas, close the electric butterfly valve in front of the water seal section of the gas pipeline, close the third drainage gate valve, and then fill the water seal section of the gas pipeline with water through the water supply pipeline. When water starts to flow in the overflow pipe, the liquid level displayed on the liquid level gauge is the liquid level height of the water seal section of the gas pipeline. If the liquid level height measured by the liquid level gauge is the same as the water seal liquid level height required by the design, stop filling with water.

[0014] The present invention has the following beneficial effects:

[0015] The present invention provides a structure and method for online adding water level monitoring to the water seal of a gas pipeline. By modifying the existing water seal system of a gas pipeline, online water level monitoring of the pipeline water seal is added without the need to stop the gas, thereby improving the safety of the original water seal structure and further ensuring the safety of production and operation personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 A schematic diagram of the structure of adding online water level monitoring to the water seal of a gas pipeline provided in an embodiment of the present invention (the arrow in the figure indicates the direction of gas transmission).

[0018] In the figure: gas pipeline 1, purge valve 2, gas pipeline water seal section 3, user 4, liquid level meter 5, liquid level meter connecting valve 6, water seal height 7, water supply pipeline 8, first drainage pipeline 9, first drainage gate valve 10, second drainage gate valve 11, gas drainage sealing tank 12, third drainage gate valve 13, collecting tank 14, overflow pipe 15, electric butterfly valve 16, second drainage pipeline 17, buffer pipe section 18, highest liquid level point of gas pipeline water seal section 19, lowest liquid level point of gas pipeline water seal section 20, small-diameter bypass 21, bypass small valve 22, main water supply valve 23. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] like Figure 1 The embodiment of the present invention provides a structure for online water level monitoring of a gas pipeline water seal, comprising a liquid level meter 5, a gas pipeline 1 for delivering gas to a user 4, a U-shaped gas pipeline water seal section 3 being provided on the gas pipeline 1, a vertical distance between a highest liquid level point 19 of the gas pipeline water seal section 3 and a lowest liquid level point 20 of the gas pipeline water seal section 3 being a water seal height (the water seal liquid level height required by the design), a water supply pipeline 8 being connected to the highest liquid level point 19 of the gas pipeline water seal section 3, the gas pipeline water seal section 3 being connected to a gas drainage sealing tank 12 via a first drainage pipeline 9, and the gas drainage The sealing tank 12 is connected with the overflow pipe 15 through the second drainage pipe 17, the first drainage pipe 9 is parallel to the second drainage pipe 17, the second drainage pipe 17 and the overflow pipe 15 form an inverted U-shaped structure, the highest liquid level point of the overflow pipe 15 is at the same height as the highest liquid level point 19 of the water seal section 3 of the gas pipeline, the liquid level meter 5 is connected to the top of the second drainage pipe 17 through two liquid level meter connecting valves 6, one liquid level meter connecting valve is at the same height as the highest liquid level point 19 of the water seal section 3 of the gas pipeline, and the other liquid level meter connecting valve is at the same height as the lowest liquid level point 20 of the water seal section 3 of the gas pipeline.

[0021] In this embodiment, a first drain gate valve 10 and a second drain gate valve 11 are provided on the first drain pipe 9. The structure for increasing the water level monitoring of the gas pipeline water seal online also includes a collection tank 14, and the second drain pipe 17 and the overflow pipe 15 are both connected to the collection tank 14. A third drain gate valve 13 is provided on the connecting pipe between the second drain pipe 17 and the collection tank 14. A purge valve 2 for purging the gas pipeline is also provided on the gas pipeline 1. A U-shaped buffer pipe section 18 is also provided on the water supply pipe 8, and the height of the buffer pipe 18 in the vertical direction is the same as the height of the water seal.

[0022] The present invention provides a structure and method for online adding water level monitoring to the water seal of a gas pipeline. By modifying the existing water seal system of a gas pipeline, online water level monitoring of the pipeline water seal is added without the need to stop the gas, thereby improving the safety of the original water seal structure and further ensuring the safety of production and operation personnel.

[0023] like Figure 1 The method for online monitoring of water level of gas pipeline water seal provided by the present invention is as follows (applied to the structure of online monitoring of water level of gas pipeline water seal mentioned above):

[0024] When the gas pipeline 1 is normally transporting gas, the condensed water in the gas pipeline 1 is discharged into the collection pool 14 through the first drain gate valve 11, the second drain gate valve 12, and the third drain gate valve 13. When it is not necessary to stop the gas, the first drain gate valve 11, the second drain gate valve 12, and the third drain gate valve 13 are closed, and a liquid level gauge 5 is added online at the upper part of the second drainage pipeline 17, corresponding to the position of the water seal section of the gas pipeline, without affecting normal production; the liquid level gauge is added online, that is, the liquid level gauge 5 and the liquid level gauge connecting valve 6 are constructed online, so that the liquid level gauge 5 is connected to the top of the second drainage pipeline 17 through the two liquid level gauge connecting valves 6, one liquid level gauge connecting valve is at the same height as the highest point of the liquid level of the water seal section of the gas pipeline, and the other liquid level gauge connecting valve is at the same height as the lowest point of the liquid level of the water seal section of the gas pipeline;

[0025] After adding the level gauge 5 online, when the gas pipeline 1 stops delivering gas, close the electric butterfly valve 16 in front of the water seal section 3 of the gas pipeline, close the third drain gate valve 13, and then fill the water seal section 3 of the gas pipeline through the water supply pipeline 8 (the main water supply valve 23 is open, and the bypass small valve 22 is closed). When water starts to flow in the overflow pipe 15, the liquid level displayed by the level gauge 5 is the liquid level height of the water seal section 3 of the gas pipeline. If the liquid level height measured by the level gauge 5 is the same as the water seal liquid level height required by the design, the main water supply valve 23 can be closed, and the bypass small valve 22 can be opened, so that the overflow pipe 15 always maintains an overflow state. When the water seal section of the gas pipeline is filled with water, the level gauge 5 can monitor the water seal liquid level online to ensure the water seal height and ensure that the water seal effectively seals the gas.

[0026] In addition, the signal of the liquid level meter 5 can be introduced into the DCS monitoring (DCS is a distributed control system), and has a low water level sound and light alarm function. When the water seal height monitored by the liquid level meter 5 is lower than the water seal liquid level height required by the design, the sound and light alarm electrically connected to the DCS monitoring will send an alarm to the staff, reminding the staff to replenish water to the gas pipeline water seal section 3 through the water supply pipeline 8, and check the reason for the lowering of the water seal liquid level, and take effective measures to ensure that the water level does not drop any more.

[0027] A small-diameter bypass 21 is provided on the water supply pipe 8, and a small bypass valve 22 (DN25) is provided on the small-diameter bypass 21. The small bypass valve 22 is connected in parallel with the main water supply valve 23 (DN150). After the water seal section 3 of the gas pipeline is full of water, the main water supply valve 23 is closed, and then the small bypass valve 22 is opened, so that the overflow pipe 15 always keeps overflowing. Switching the small bypass valve 18 plays a role in saving water and avoiding waste.

[0028] The present invention provides a structure and method for online water level monitoring of a gas pipeline water seal, which can monitor the liquid level of the gas pipeline water seal in real time when the water is filled, and effectively prevent the problems of the gas pipeline water seal liquid level drop, water seal breakdown, gas leakage, etc.

[0029] The present invention provides a structure and method for online water level monitoring of a gas pipeline water seal, which can monitor the water seal liquid level online. If the water level drops, a low water level sound and light alarm can be triggered to remind operators to replenish water in time, thereby reducing the probability of events such as low water level of the water seal or water seal being punctured.

[0030] In the present invention, the liquid level meter can adopt various types such as magnetic levitation type, pressure type, ultrasonic wave, sonar wave, magnetic flap, radar, etc.

[0031] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0032] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A structure for adding water level monitoring to the water seal of a gas pipeline online, characterized in that: The utility model comprises a liquid level meter and a gas pipeline for conveying gas to users, wherein a U-shaped gas pipeline water seal section is arranged on the gas pipeline, the vertical distance between the highest liquid level point of the gas pipeline water seal section and the lowest liquid level point of the gas pipeline water seal section is the water seal height, the water supply pipeline is connected with the highest liquid level point of the gas pipeline water seal section, the gas pipeline water seal section is connected with the gas drainage sealing tank through the first drainage pipe, the gas drainage sealing tank is connected with the overflow pipe through the second drainage pipe, the first drainage pipe is parallel to the second drainage pipe, the second drainage pipe and the overflow pipe form an inverted U-shaped structure, the highest liquid level point of the overflow pipe is at the same height as the highest liquid level point of the gas pipeline water seal section, the liquid level meter is connected with the top of the second drainage pipe through two liquid level meter connecting valves, and one liquid level meter connecting valve is at a height of the highest liquid level point of the gas pipeline water seal section. Similarly, the other liquid level gauge connecting valve is at the same height as the lowest point of the liquid level in the water seal section of the gas pipeline; the structure for adding online water level monitoring of the gas pipeline water seal is improved by modifying the existing gas pipeline water seal system. When there is no need to stop the gas, online pipeline water seal water level monitoring is added, thereby improving the safety of the original water seal structure and further ensuring the safety of production and operation personnel; a first drainage gate valve and a second drainage gate valve are provided on the first drainage pipeline; the structure for adding online water level monitoring of the gas pipeline water seal also includes a collecting pool, and the second drainage pipeline and the overflow pipe are both connected to the collecting pool; a third drainage gate valve is provided on the connecting pipeline between the second drainage pipeline and the collecting pool; a small-diameter bypass is provided on the water supply pipeline, and a small bypass valve is provided on the small-diameter bypass, and the small bypass valve is connected in parallel with the main water supply valve.

2. The structure for adding water level monitoring on-line to the water seal of a gas pipeline as claimed in claim 1 is characterized by: There is also a purge valve on the gas pipeline.

3. The structure for adding water level monitoring on-line to the gas pipeline water seal as claimed in claim 1 is characterized by: A U-shaped buffer pipe section is also provided on the water supply pipeline, and the height of the buffer pipe in the vertical direction is the same as the water seal height.

4. A method for online monitoring of water level of gas pipeline water seal, applied to the structure for online monitoring of water level of gas pipeline water seal as claimed in any one of claims 1 to 3, characterized in that: The steps include: S1. When the gas pipeline is transporting gas normally, the condensed water in the gas pipeline is discharged into the collection pool through the first drainage gate valve, the second drainage gate valve, and the third drainage gate valve. When it is not necessary to stop the gas, the first drainage gate valve, the second drainage gate valve, and the third drainage gate valve are closed. At the upper part of the second drainage pipeline, corresponding to the position of the water seal section of the gas pipeline, a liquid level gauge is added online without affecting normal production; the liquid level gauge is added online, that is, the liquid level gauge and the liquid level gauge connecting valve are constructed online, so that the liquid level gauge is connected to the top of the second drainage pipeline through two liquid level gauge connecting valves, one liquid level gauge connecting valve is at the same height as the highest point of the liquid level of the water seal section of the gas pipeline, and the other liquid level gauge connecting valve is at the same height as the lowest point of the liquid level of the water seal section of the gas pipeline; S2. After adding a liquid level gauge online, when the gas pipeline stops transporting gas, close the electric butterfly valve in front of the water seal section of the gas pipeline, close the third drainage gate valve, and then fill the water seal section of the gas pipeline through the water supply pipeline. At this time, the main water supply valve is open and the small bypass valve is closed. When water begins to flow in the overflow pipe, the liquid level displayed by the liquid level gauge is the liquid level height of the water seal section of the gas pipeline. If the liquid level height measured by the liquid level gauge is the same as the water seal liquid level height required by the design, that is, after the water seal section of the gas pipeline is full of water, close the main water supply valve and open the small bypass valve to keep the overflow pipe in an overflow state. Switching the small bypass valve saves water and avoids waste. When the water seal section of the gas pipeline is filled with water, the liquid level gauge can monitor the water seal liquid level online to ensure the water seal height and ensure that the water seal effectively seals the gas.

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