Self-cleaning ball valve for high-sulfur gas field

Abstract

The utility model relates to cleaning of a valve shell structure, in particular to a self-cleaning ball valve for a high sulfur gas field. The self-cleaning ball valve for the high-sulfur-content gas field comprises a valve body, a valve ball is arranged in a valve cavity of the valve body, and the valve body is connected with a dosing system used for filling cleaning solvent into the valve cavity, a pressure relief system used for discharging sulfur-containing gas in a pipeline and a waste liquid recovery system used for recovering waste cleaning solvent. A dosing system and a pressure relief system are connected to a valve body of the ball valve, and a waste liquid recovery system is connected to the bottom end of the valve body. In the whole cleaning process, the ball valve does not need to be opened, cleaning of all sulfur-containing impurities is completed in the ball valve, cleaning personnel are prevented from making contact with harmful sulfur-containing gas or sulfur-containing simple substances, meanwhile, the cleaning solution can thoroughly clean away water-insoluble or indissolvable impurities, the ball valve cleaning process is simpler and safer, and the cleaning efficiency is improved. And the cleaning effect of the ball valve is more obvious.

Description

Technical Field

[0001] The utility model relates to the cleaning of a valve shell structure, in particular to a self-cleaning ball valve for a high-sulfur gas field. Background Art

[0002] The ball valve consists of a valve body, a valve ball, a seal and an actuator. The ball valve is mainly used in pipelines to cut off, distribute and change the flow direction of the medium. It only needs to rotate 90 degrees and a very small torque to close tightly. The ball valve is most suitable for use as a switch and cut-off valve.

[0003] Ball valves are mainly used for fluid cutoff control on large-diameter pipelines for gathering and transportation in high-sulfur gas fields. They are important equipment in the automation control system of high-sulfur gas fields. Ball valves control the valve ball through the valve stem. The existing ball valves in the valve chambers of high-sulfur gas fields are used to transport acidic natural gas with high hydrogen sulfide content produced by high-sulfur gas wells. During the transportation process, the medium will precipitate a single substance flow in the gathering and transportation pipelines, ball valve air flow channels, ball valve chambers and other parts, causing single sulfur deposition and impurity blockage. Most of the sulfur-resistant ball valves in the existing technology are one-piece and difficult to disassemble. When cleaning them, they are mostly cleaned manually. During the cleaning process, water is usually injected from both sides for cleaning. Most impurities remain in the gap between the valve ball and the valve body. Water flushing at both ends will flush the impurities deeper. In addition, sulfur is a relatively harmful substance. The water splashed back during the flushing of workers may contact the skin and cause harm to the staff.

[0004] In order to solve the above problems, a Chinese utility model patent with authorization announcement number CN219549663U and authorization announcement date August 28, 2023 discloses a high-sulfur resistant ball valve that is easy to clean, the ball valve comprising a valve body, a sealing shell is provided on the valve body, a rotating rod is installed in the sealing shell, one side of the rotating rod is connected to a volute, a connecting rod is provided in the volute, a valve core is installed at one end of the connecting rod, a connecting port is provided on one side of the valve body, a cleaning port is provided on the outside of the valve cavity, a connecting block is provided in the cleaning port, a spring is connected to the connecting block, an external water pipe is connected to the cleaning port, and after the water source is introduced, the water flow will flush from the center position of the valve core to both sides. During the flushing process, the runner can also be continuously rotated to flush away the sulfur-containing impurities on the valve core rotating shaft as quickly as possible and at multiple angles. When impurities are stuck in the valve core, the sealing shell can be opened, the connecting rod can be removed, and the valve core can be loosened to rotate at a free angle to remove them.

[0005] The existing technology can directly add water to the valve core position through the cleaning port, so as to flush the impurities from the middle to both sides. The flushing water will flow out from the two connecting ends and will not splash on the workers. The direction of the valve core can be adjusted by using a rotating wheel, so that the valve core can be fully cleaned.

[0006] However, the existing technology cannot completely avoid opening the sulfur-containing ball valve. When cleaning the valve core, the sealing cover still needs to be opened for cleaning. At the same time, the existing technology uses an external water source for cleaning. Some sulfur-containing impurities are difficult to dissolve in water or only partially dissolve in water. It is difficult to clean the ball valve using only clean water. Utility Model Content

[0007] The utility model aims to provide a self-cleaning ball valve for high-sulfur gas fields, so as to solve the problems that the prior art cannot completely avoid opening the sulfur-containing ball valve when cleaning the valve cavity, and some sulfur-containing impurities are difficult to dissolve in water or partially dissolve in water, and it is difficult to clean the ball valve only by flushing with clean water.

[0008] In order to achieve the above purpose, the high sulfur gas field self-cleaning ball valve of the utility model adopts the following technical solutions:

[0009] A self-cleaning ball valve for a high-sulfur gas field comprises a valve body, a valve ball is arranged in a valve cavity of the valve body, a dosing system for adding a cleaning solvent into the valve cavity, a pressure relief system for discharging sulfur-containing gas in a pipeline, and a waste liquid recovery system for recovering waste cleaning solvent is connected to the valve body.

[0010] Furthermore, the valve body includes a sealing valve cover, and the drug adding system and the pressure relief system are both connected to the sealing valve cover.

[0011] Furthermore, the dosing system includes a dosing pipeline and a medicine pump, a dosing switch valve and a dosing check valve arranged on the dosing pipeline.

[0012] Furthermore, a neutralization container is connected to the end of the pressure relief system.

[0013] Furthermore, the waste liquid recovery system is connected to the neutralization container through a pipeline.

[0014] Furthermore, the dosing system includes a first pressure gauge, and the high-sulfur gas field self-cleaning ball valve also includes a second pressure gauge for detecting the valve cavity pressure.

[0015] Furthermore, the waste liquid recovery system includes a sewage valve and a sewage collection container connected in series, and a neutralization container is connected after the sewage valve.

[0016] Furthermore, the waste liquid recovery system includes a third pressure gauge.

[0017] Furthermore, the waste collection container of the waste liquid recovery system is provided with an emptying valve.

[0018] Furthermore, the waste liquid recovery system is connected to the bottom of the valve chamber.

[0019] Beneficial effects: The self-cleaning ball valve for high-sulfur gas fields of the utility model is an improved invention. The valve body of the ball valve is connected with a dosing system and a pressure relief system, and the bottom of the valve body is connected with a waste liquid recovery system. During the cleaning process, the dosing system and the pressure relief system are first opened, and the cleaning solution is sent into the valve cavity. After sufficient soaking, the waste liquid recovery system is opened to discharge the sulfur-containing waste liquid for disposal. The ball valve does not need to be opened during the entire cleaning process, and all cleaning of sulfur-containing impurities is completed inside the ball valve, which prevents the cleaning personnel from contacting harmful sulfur-containing gases or sulfur-containing elements. At the same time, the cleaning solution can thoroughly clean up impurities that are insoluble or difficult to dissolve in water, making the process of cleaning the ball valve simpler and safer, and making the cleaning effect of the ball valve more obvious. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The utility model is a structural schematic diagram of an online cleaning device for a ball valve chamber of a sulfur-containing gas field.

[0021] Figure 1 In: 1. Chemical pump; 2. First pressure gauge; 3. Dosing switch valve; 4. Dosing check valve; 5. Actuator; 6. Valve stem; 7. Sealing valve cover; 8. Valve body; 9. Valve cavity; 10. Valve ball; 11. Acid gas pipeline; 12. Second pressure gauge; 13. Valve cavity pressure relief valve; 14. Drain valve; 15. Third pressure gauge; 16. Waste collection container; 17. Drain valve; 18. Neutralization container. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model and are not used to limit the utility model, that is, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0023] The specific implementation of the self-cleaning ball valve for high-sulfur gas fields of the utility model is as follows:

[0024] Ball valves are used in sour natural gas transmission pipelines to control the opening and closing of pipelines. During long-term use, sulfur mixed in natural gas will be deposited in pipelines and ball valves, affecting the normal opening and closing of ball valves. Therefore, ball valves need to be cleaned regularly. In traditional methods, ball valves need to be disassembled for cleaning, which is inefficient, costly, and dangerous due to the toxicity of sulfur.

[0025] In view of the above problems, the prior art discloses a technical solution, that is, an opening is provided on the valve body of the ball valve, water is injected into the valve cavity of the valve body through the opening, and the ball valve is cleaned by water washing. Although this method can reduce labor intensity, the ball valve still needs to be removed, and impurities such as sulfides are insoluble in water, so the above cleaning method has limited effect.

[0026] Based on the characteristics that impurities such as sulfide are easily soluble in sodium sulfide, sodium hydroxide and N-methylpyrrolidone, the utility model prepares a sulfur dissolving agent with sodium sulfide, sodium hydroxide and N-methylpyrrolidone in a certain ratio, hoping to optimize the cleaning effect through the sulfur dissolving agent. Considering that the sulfide will be dissolved after being immersed in the solvent, there is no need to perform violent flushing, scrubbing and other operations. Therefore, it is further expected to achieve the effect of online cleaning, that is, when cleaning the ball valve, it is not disassembled, but left on the gas pipeline for cleaning. In order to achieve this purpose, it is necessary to consider how to add solvent to the valve cavity of the ball valve, so a dosing system is configured on the ball valve. Considering that the gas in the pipeline will form a pressure build-up and hinder the addition of solvent, a pressure relief system is configured on the ball valve. Considering the treatment of solvents and waste, a waste liquid recovery system is set on the ball valve. When the ball valve needs to be cleaned, first close the valves on both sides of the ball valve on the pipeline, then open the pressure relief system and the dosing system in turn, add solvent to the valve cavity of the ball valve, and after the solvent is added, soak for a set time until the dirt in the valve cavity is dissolved. Through the process of opening and closing the valve, most of the waste liquid in the chamber flows into the pipeline from the chamber and is taken out with the operation of the pipeline. The remaining small amount of liquid in the chamber is recovered by opening the waste liquid recovery system. After the cleaning is completed, the dosing system, pressure relief system and waste liquid recovery system are cut off from the ball valve respectively, and the valves on both sides of the ball valve are opened, and the pipeline resumes normal operation.

[0027] Specifically, in Figure 1 In a specific embodiment shown, the ball valve specifically adopts a straight-through spherical ball valve, which is composed of a valve body 8, a sealing valve cover 7, and an actuator 5. The valve body 8 is provided with a valve cavity 9 and a valve ball 10. A through hole with the same diameter as the acid gas pipeline 11 is opened on the side of the valve ball 10, and the acid gas channel 11 passes through the ball valve through its through hole; the valve cavity 9 is a spherical cavity; the sealing valve cover 7 is a rectangular structure with an arc bottom, and a valve stem 6 is provided at the center of the plane of the sealing valve cover 7. The valve stem 6 and the valve ball 10 are an integrated mechanism, and the actuator 5 is installed on the valve stem 6, so that the actuator 5 can drive the valve ball to rotate. In other embodiments, the type of ball valve can also be a V-type ball valve. The V-type ball valve has the advantages of a large adjustable range and strong flow capacity. In summary, the ball valve of this embodiment only needs to be able to meet the switch of the gas pipeline.

[0028] exist Figure 1In a specific embodiment, the dosing device includes a dosing pipeline and a medicine pump 1, a first pressure gauge 2, a dosing switch valve 3 and a dosing check valve 4 arranged on the dosing pipeline. The dosing check valve 4 prevents the cleaning solvent from flowing in the reverse direction, protects the dosing pipeline, and improves the dosing efficiency of the dosing pipeline. When the dosing switch valve 3 is working normally, the dosing switch valve 3 remains normally closed to prevent the sulfur-containing gas from escaping.

[0029] The pressure relief system includes a pressure relief line and a neutralization container 18 connected to the end of the pressure relief line, and a valve cavity pressure relief valve 13 arranged on the pressure relief line. When the valve is working normally, the valve cavity pressure relief valve 13 is also kept normally closed to prevent sulfur-containing gas from escaping and endangering the health of operators. In this embodiment, the neutralization container 18 is in the shape of a can. In other embodiments, the neutralization container 18 can also be in the shape of a bottle or a tank. Any shape that can meet the recovery of sulfur-containing gas can be adopted.

[0030] The waste liquid recovery system includes a waste liquid recovery pipeline and a waste collection container 16, a third pressure gauge 15 and a series-connected drain valve 14 arranged on the waste liquid recovery pipeline. Similarly, the end of the waste liquid recovery pipeline is also connected to a neutralization container 18. In this embodiment, the pressure relief system and the waste liquid recovery system share the same neutralization container 18. In other embodiments, a special neutralization container can also be configured for the waste liquid recovery system.

[0031] In addition, a second pressure gauge 12 for reading the valve cavity pressure is provided on the acid gas pipeline 11 .

[0032] The working process is described below in combination with the above embodiments.

[0033] Before cleaning the ball valve, the valves on both sides of the acid gas pipeline 11 are closed to ensure that no sulfur-containing gas continues to flow into the acid gas pipeline 11.

[0034] Then, the valve cavity pressure relief valve 13 of the pressure relief system and the dosing switch valve 3 of the dosing system are opened in sequence. When the reading of the first pressure gauge 2 on the dosing system is greater than the reading of the second pressure gauge 12 monitoring the pressure in the valve cavity, the reagent pump 1 injects the cleaning solution into the valve cavity 9. When the cleaning solution fills the valve cavity 9, the dosing switch valve 3 and the valve cavity pressure relief valve 13 are closed. After the dirt in the valve cavity 9 is fully soaked and all the dirt in the valve cavity 9 is dissolved, most of the waste liquid in the valve cavity 9 flows from the chamber into the pipeline through the valve switching process and is taken out with the operation of the pipeline. For the small amount of liquid remaining in the valve ball 9, the drain valve 14 of the waste liquid recovery system is opened, and the remaining waste flows into the waste collection container 16 through the waste liquid recovery pipeline. The third pressure gauge is observed. When the reading of the third pressure gauge is 0, the drain valve 14 is closed. After a period of rest, after the sulfur-containing gas in the waste recovery container flows into the neutralization container 18 through the pipeline, the emptying valve 17 is opened to discharge the waste liquid.

[0035] After all cleaning steps are completed, the drain valve 17 is closed, and the valve ball 10 of the ball valve is rotated to a state of being connected to the acid gas pipeline 11, so as to restore the normal operation of the pipeline.

Claims

1. A self-cleaning ball valve for high-sulfur gas fields, comprising a valve body, a valve ball is arranged in the valve cavity of the valve body, and is characterized in that: The valve body is connected with a dosing system for adding a cleaning solvent into the valve cavity, a pressure relief system for discharging sulfur-containing gas in the pipeline, and a waste liquid recovery system for recovering waste cleaning solvent.

2. The self-cleaning ball valve for high-sulfur gas fields according to claim 1 is characterized in that: The valve body comprises a sealing valve cover, and the drug adding system and the pressure relief system are both connected to the sealing valve cover.

3. The self-cleaning ball valve for high-sulfur gas fields according to claim 1 or 2, characterized in that: The dosing system comprises a dosing pipeline, a medicine pump, a dosing switch valve and a dosing check valve arranged on the dosing pipeline.

4. The self-cleaning ball valve for high-sulfur gas fields according to claim 1 or 2, characterized in that: The end of the pressure relief system is connected with a neutralization container.

5. The self-cleaning ball valve for high-sulfur gas fields according to claim 4 is characterized in that: The waste liquid recovery system is connected to the neutralization container through a pipeline.

6. The self-cleaning ball valve for high-sulfur gas fields according to claim 1 or 2, characterized in that: The dosing system comprises a first pressure gauge, and the self-cleaning ball valve for high-sulfur gas fields further comprises a second pressure gauge for detecting the valve cavity pressure.

7. The self-cleaning ball valve for high-sulfur gas fields according to claim 1 is characterized in that: The waste liquid recovery system comprises a sewage discharge valve and a sewage and waste collection container connected in series, and a neutralization container is connected after the sewage discharge valve.

8. The self-cleaning ball valve for high-sulfur gas fields according to claim 1 or 7, characterized in that: The waste liquid recovery system includes a third pressure gauge.

9. The self-cleaning ball valve for high-sulfur gas fields according to claim 7 is characterized in that: The waste collection container of the waste liquid recovery system is provided with an emptying valve.

10. The self-cleaning ball valve for high-sulfur gas fields according to claim 1 or 7, characterized in that: The waste liquid recovery system is connected to the bottom of the valve chamber.

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