High-reliability gas pipeline sealing drainage device

Abstract

The utility model discloses a high-reliability gas pipeline sealing drainage device which comprises a horn mouth, a primary valve, a downcomer, a telescopic pipe, a secondary valve, a water seal tank and a foundation, the upper end of the downcomer is connected with the lowest position of a section of gas pipeline through the horn mouth, and the lower end of the downcomer is inserted into the water seal tank. The side wall of the downcomer is hermetically connected with the top plate of the water seal tank; the primary valve, the telescopic pipe and the secondary valve are mounted on the downcomer between the horn mouth and the water seal tank and are sequentially arranged from top to bottom, and the water seal tank is mounted on a foundation. According to the utility model, the telescopic pipe is arranged on the downcomer, when the water seal tank foundation is settled, the tension of the water seal tank on the downcomer is reduced through the extension of the telescopic pipe, so that the gas leakage caused by the pull crack of the downcomer and a horn mouth welding seam can be avoided, the reliability of the drainage device is greatly improved, and the stable operation of a gas pipeline is ensured; and the maintenance cost of the drainage device is reduced.

Description

Technical Field

[0001] The utility model relates to a sealing drainage device installed on a gas transmission pipeline, belonging to the technical field of pipeline systems. Background Art

[0002] In the process of dust removal, purification, pressurization and transportation, coal gas will inevitably bring in impurities and solid dust particles such as moisture, phenol, cyanide, naphthalene, tar, and peeling paint. In the process of using gas pipelines to transport gas, a large amount of condensate will be generated in the pipeline. The condensate will accelerate the electrochemical corrosion of the gas pipe wall. When there is a lot of condensate, it will be pushed by the gas flow and will also produce tides, causing gas pressure fluctuations. The accumulation of condensate will reduce the cross-section of the pipeline, increase the pressure drop, and form a water seal in the low-lying area to stop gas transmission. Severe cases may even cause the pipeline to be overloaded or the pipeline to collapse due to shaking. Therefore, drainage devices are generally installed on gas pipelines. The drainage device of the gas pipeline is set at the lowest point of a section of the pipeline, including a bell mouth, a downcomer and a water seal groove. The water in the gas pipeline is first collected by the bell mouth, then flows into the water seal groove through the downcomer, and finally flows out from the overflow pipe on the side of the water seal groove. The drainage device uses the sealing pressure capacity of the water seal groove to seal the gas, and at the same time continuously discharges condensate from the overflow pipe, reducing the load on the gas pipeline and enabling the gas pipeline to operate stably.

[0003] The water seal tank is set on a concrete or steel foundation, which has the advantages of convenient maintenance, easy detection and treatment of leaks, etc. However, it is found in the actual operation process that the concrete or steel foundation will undergo uneven settlement, especially in the new plant area located in the mountainous area, the gas pipeline layout and backfilling section, and the settlement of the water seal tank foundation is inevitable. Since the weight of the water seal tank body and the internal water is close to 1 ton, once the water seal tank foundation settles, the downcomer and the bell mouth will bear a large tensile force, which will pose a great threat to the stable operation of the gas pipeline. There are two traditional solutions. One is to place an inclined iron pad at the bottom of the water seal tank for alignment when the water seal tank settles (the water seal tank will generally tilt after settlement). Due to the long duration of settlement, the water seal tank needs to be aligned many times. Each time the water seal tank is aligned, it needs to stop running or take temporary reinforcement measures, which increases the maintenance cost; the other solution is to dig out the concrete foundation, replace and compact a large area of ​​soil, and re-cast the concrete foundation. The construction period is long, the cost is high, and it cannot guarantee that the water seal tank will not settle again. In addition, the above two treatment methods require the inspection personnel to have a strong sense of responsibility and be able to detect settlement in time, otherwise the downcomer and bell mouth will be damaged due to the large tensile stress, affecting the stable operation of the gas pipeline. Utility Model Content

[0004] The purpose of the utility model is to provide a highly reliable gas pipeline sealing and drainage device to address the shortcomings of the prior art, so as to prevent the settlement of the water seal groove foundation from affecting the stable operation of the gas pipeline and reduce the maintenance cost of the drainage device.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A highly reliable gas pipeline sealing and drainage device comprises a bell mouth, a primary valve, a down pipe, a telescopic pipe, a secondary valve, a water seal groove and a foundation, wherein the upper end of the down pipe is connected to the lowest point of a section of gas pipeline through the bell mouth, and the lower end is inserted into the water seal groove, and the side wall of the down pipe is sealed and connected to the top plate of the water seal groove; the primary valve, the telescopic pipe and the secondary valve are installed on the down pipe between the bell mouth and the water seal groove and are arranged in sequence from top to bottom, and the water seal groove is installed on the foundation.

[0007] The above-mentioned high-reliability gas pipeline sealing and drainage device, the water seal groove includes an outer shell, a vertical partition, an inner overflow pipe and an outer overflow pipe, the outer shell is in the shape of a rectangular parallelepiped, and its inner cavity is divided into a plurality of accommodating chambers arranged along the length direction of the outer shell by a plurality of vertical partitions, the lower end of the downcomer is inserted into the first accommodating chamber, and every two adjacent accommodating chambers are connected by an inner overflow pipe, the inlet of the inner overflow pipe is connected to the overflow port on the upper part of the side wall of the previous accommodating chamber, and the other end is located at the bottom of the next accommodating chamber, and the inlet of the outer overflow pipe is connected to the overflow port on the upper part of the side wall of the last accommodating chamber.

[0008] In the above-mentioned high-reliability gas pipeline sealing and drainage device, a detection port is installed on the downcomer between the primary valve and the secondary valve, and a plug valve is installed on the detection port.

[0009] In the above-mentioned high-reliability gas pipeline sealing and drainage device, the downcomer is a curved pipe.

[0010] In the above-mentioned high-reliability gas pipeline sealing and drainage device, the telescopic pipe is a bellows.

[0011] In the above-mentioned high-reliability gas pipeline sealing and drainage device, the primary valve and the secondary valve are both gate valves.

[0012] The utility model installs a telescopic pipe on the downcomer. When the water seal groove foundation settles, the tension of the water seal groove on the downcomer is reduced by extending the telescopic pipe, which can avoid gas leakage caused by cracking of the downcomer and the bell-mouth weld, greatly improves the reliability of the drainage device, ensures the stable operation of the gas pipeline, and reduces the maintenance cost of the drainage device. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0014] Figure 1 It is a structural schematic diagram of the utility model;

[0015] Figure 2It is a cross-sectional view of the water seal groove.

[0016] The numbers in the figure are as follows: 1, overhead gas pipeline, 2, bell mouth, 3, primary valve, 4, downcomer, 5, telescopic pipe, 6, detection port, 7, secondary valve, 8, water seal groove, 9, foundation;

[0017] 8-1, outer shell, 8-2, vertical partition, 8-3, inner overflow pipe, 8-4, outer overflow pipe. DETAILED DESCRIPTION

[0018] The utility model aims at the drawbacks of the prior art and provides a highly reliable gas pipeline sealing and drainage device to prevent the downcomer and the bell mouth from being damaged by large tensile stress when the foundation settlement of the water seal groove is not discovered in time, thereby avoiding serious safety accidents such as large-scale gas leakage, ensuring the stable operation of the gas pipeline and reducing the labor intensity of workers.

[0019] See also Figure 1 and Figure 2 The utility model mainly includes a bell mouth 2, a primary valve 3, a downcomer 4, a telescopic tube 5, a detection port 6, a secondary valve 7, a water seal groove 8 and a foundation 9, wherein the water seal groove 8 includes an outer shell 8-1, a vertical partition 8-2, an inner overflow pipe 8-3 and an outer overflow pipe 8-4.

[0020] The upper end of the downcomer 4 is connected to the overhead gas pipeline 1 through the bell mouth 2, and the lower end is inserted into the water seal groove 8. The side wall of the downcomer 4 is sealed and connected to the top plate of the water seal groove 8. The primary valve 3, the telescopic pipe 5, the detection port 6 and the secondary valve 7 are installed on the downcomer 4 and arranged in sequence from top to bottom.

[0021] The outer shell 8-1 of the water seal tank 8 is in the shape of a rectangular parallelepiped, and its inner cavity is divided into a plurality of accommodating cavities arranged along its length direction by a plurality of vertical partitions 8-2. The lower end of the downcomer 4 is inserted into the first accommodating cavity.

[0022] As shown in the figure, the bell mouth 2 is close to the overhead gas pipeline 1, and its opening is as large as possible to facilitate the discharge of condensed water and debris.

[0023] As shown in the figure, the primary valve 3 is a gate valve, which is in a fully open state under normal circumstances.

[0024] As shown in the figure, the down pipe 4 is a bent pipe to avoid vertical installation, and the down pipe 4 has at least one section installed at an angle.

[0025] As shown in the figure, the telescopic tube 5 is a corrugated tube, which is connected to the downcomer 4 by a flange connection. The elongation is preset, and it needs to be replaced when the actual elongation exceeds the set value.

[0026] As shown in the figure, the valve at the detection port 6 is a plug valve, which is convenient for daily inspection; the secondary valve 7 is a gate valve.

[0027] The installation and use process of this utility model is as follows:

[0028] A telescopic pipe 5 is added to the original downcomer 4, and the telescopic pipe 5 is installed between the primary valve 3 and the secondary valve 7, which greatly eliminates the pulling force of the water seal groove 8 and the weight of water on the downcomer 4. The installation process of the telescopic pipe 5 is as follows: close the primary valve 3, release the residual gas through the detection port 6, and after the pressure meets the safety requirements, plug the blind plate at the flange below the primary valve 3, use a single-sided gasket, and then pass steam at the detection port 6 to replace the downcomer 4 and the water seal groove 8 to the hot work state, perform hot work cutting on the corresponding part of the pipeline on the upper side of the secondary valve 7, and install the telescopic pipe 5. The telescopic pipe 5 is a flange-type bellows expansion joint. After the test shows no leakage, remove the blind plate to restore the downcomer 4 and the water seal groove 8, and it can be transformed into a drainage device that can prevent the water seal groove downcomer from cracking.

[0029] The utility model utilizes the extension of the telescopic tube 5 to reduce the pulling force of the water seal groove 8 on the down pipe 4 when the water seal groove foundation settles, thereby preventing the down pipe 4 and the bell mouth 2 from leaking gas due to the cracking of the welding seam due to the pulling force.

[0030] When the elongation of the telescopic tube 5 reaches the design value, the telescopic tube 5 that meets the use requirements can be replaced while reinforcing the water seal groove foundation.

[0031] Embodiment: According to the actual operation situation of the gas operation area, the gas overhead pipeline on Liantie West Road was renovated.

[0032] After installing the utility model, no additional operating costs and labor are required, the safe operation of the water seal tank of the gas pipe network is realized, the maintenance frequency is greatly reduced, the repeated alignment of the water seal tank is avoided, and the long-term stable operation of the gas system pipe network is ensured. The device also has the advantages of simple and convenient installation and intuitive inspection.

Claims

1. A highly reliable gas pipeline sealing and drainage device, characterized in that: The invention comprises a bell mouth (2), a primary valve (3), a down pipe (4), a telescopic pipe (5), a secondary valve (7), a water seal groove (8) and a foundation (9); the upper end of the down pipe (4) is connected to the lowest point of a section of gas pipeline through the bell mouth (2); the lower end is inserted into the water seal groove (8); the side wall of the down pipe (4) is sealed and connected to the top plate of the water seal groove (8); the primary valve (3), the telescopic pipe (5) and the secondary valve (7) are installed on the down pipe (4) between the bell mouth (2) and the water seal groove (8) and are arranged in sequence from top to bottom; the water seal groove (8) is installed on the foundation (9).

2. A highly reliable gas pipeline sealing and drainage device according to claim 1, characterized in that: The water seal tank (8) comprises an outer shell (8-1), a vertical partition (8-2), an inner overflow pipe (8-3) and an outer overflow pipe (8-4); the outer shell (8-1) is in the shape of a rectangular parallelepiped, and its inner cavity is divided into a plurality of accommodating cavities arranged along the length direction of the outer shell (8-1) by a plurality of vertical partitions (8-2); the lower end of the downcomer (4) is inserted into the first accommodating cavity, and every two adjacent accommodating cavities are connected via an inner overflow pipe (8-3); the inlet of the inner overflow pipe (8-3) is connected to the overflow port at the upper part of the side wall of the previous accommodating cavity, and the other end is located at the bottom of the next accommodating cavity; the inlet of the outer overflow pipe (8-4) is connected to the overflow port at the upper part of the side wall of the last accommodating cavity.

3. A highly reliable gas pipeline sealing and drainage device according to claim 1 or 2, characterized in that: A detection port (6) is installed on the downcomer (4) between the primary valve (3) and the secondary valve (7), and a plug valve is installed on the detection port (6).

4. A highly reliable gas pipeline sealing and drainage device according to claim 3, characterized in that: The downcomer (4) is a curved pipe.

5. A highly reliable gas pipeline sealing and drainage device according to claim 4, characterized in that: The telescopic tube (5) is a bellows.

6. A highly reliable gas pipeline sealing and drainage device according to claim 5, characterized in that: The primary valve (3) and the secondary valve (7) are both gate valves.

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