A device for cleaning the pre-membrane of circulating water in a natural gas purification plant

Abstract

The utility model discloses a device suitable for natural gas purification plant circulating water cleaning pre -membrane relates to circulating water device cleaning pre -membrane technical field, including cooling water outlet pipeline, cooling water return pipeline and water pool, the first end of second main inlet pipeline is provided with the fifth control valve, and its tail end is provided with the sixth control valve, and the tail end of second main outlet pipeline is provided with the seventh control valve, and additional pipeline is provided with eighth control valve and ninth control valve in second main inlet pipeline direction to first main inlet pipeline direction in proper order, and third equipment unit sets up between eighth control valve and ninth control valve. The utility model discloses through the additional pipeline and corresponding control valve of new addition, change the communication mode of the tail end of first main inlet pipeline and the tail end of second main inlet pipeline, to reach the purpose that circulating pipeline can control the circulation cleaning alone, need not open equipment unit.

Description

Technical Field

[0001] This utility model relates to the field of cleaning and pre-filming technology for circulating water devices, specifically to a device suitable for cleaning and pre-filming circulating water in natural gas purification plants. Background Technology

[0002] The circulating water cooling system in natural gas purification units is a crucial component of the process. Many devices, such as desulfurization and decarbonization units, dehydration units, sulfur recovery units, heat exchangers, pumps, and air compressors, generate significant heat during operation. The circulating water cooling system absorbs and carries away this heat by circulating water through these devices, thereby lowering their operating temperatures and ensuring they operate within normal temperature ranges. This prevents damage or reduced efficiency due to overheating. Each stage of natural gas purification requires specific temperature conditions. By controlling equipment temperatures, the cooling water system ensures the stability and continuity of the entire process, preventing changes in process parameters caused by temperature fluctuations, and thus guaranteeing the quality and efficiency of natural gas purification.

[0003] Currently, circulating water cooling water systems all require cleaning and pre-filming to improve the operating efficiency and reliability of circulating water units in natural gas purification plants, thereby reducing equipment maintenance costs and downtime. Specifically, the main purposes of cleaning and pre-filming of circulating water units in natural gas purification plants are as follows:

[0004] 1. Purpose of cleaning

[0005] 1) Removal of dirt and impurities: During operation, circulating water systems accumulate microbial debris, impurities, dust, grease, rust, and scale within equipment and pipes. This dirt can affect the normal operation of equipment, accelerate the deposition of suspended solids, and reduce heat exchange efficiency. Chemical cleaning can remove this dirt, keeping the inner surfaces of equipment and pipelines clean, ensuring the purity of the fluid within the system, and preventing contamination of equipment and products. Furthermore, cleaning helps check the integrity of pipelines, promptly identifying and addressing potential leaks or blockages, thereby ensuring the smooth operation of subsequent production processes.

[0006] 2) Improve heat exchange efficiency: Dirt and grime can hinder heat transfer and reduce the heat exchanger's efficiency. Cleaning removes dirt and grime, effectively improving heat exchange efficiency.

[0007] 3) Prevent equipment corrosion: The presence of dirt and impurities will accelerate the corrosion of equipment. Cleaning can remove these corrosive substances and reduce the risk of equipment corrosion.

[0008] 2. Purpose of pre-filming

[0009] 1) Formation of a protective film: Pre-filming treatment forms a uniform and dense protective film on the cleaned metal surface. This protective film can adhere firmly to the metal surface, thereby inhibiting the corrosion of the metal by cooling water, including preventing microbial corrosion.

[0010] 2) Reduce corrosion rate: After the pre-filming is completed, the corrosion of the equipment can be further slowed down under the synergistic effect of the daily addition of corrosion and scale inhibitors, which helps to extend the service life of the equipment.

[0011] 3) Improved System Corrosion Resistance: Pre-filming treatment enhances the corrosion resistance of the entire circulating water system, ensuring good performance during long-term operation. Cleaning and pre-filming treatment effectively improve the operating efficiency and reliability of the circulating water system, reducing equipment maintenance costs and downtime.

[0012] Newly built or renovated circulating water cooling systems all require pre-cleaning and pre-filming to improve operational efficiency and reliability, thereby reducing equipment maintenance costs and downtime. Currently, during operation, process design flaws often lead to many impurities entering the equipment and clogging it at the beginning of cleaning. To address this issue, many systems only allow circulating water to enter a few or even just one piece of equipment to reduce clogging during pre-cleaning and pre-filming, but this results in lower cleaning efficiency.

[0013] The existing cleaning and pre-filming process of circulating water units in natural gas purification plants typically includes multiple parallel cleaning pipelines, each connected to several equipment units. A water tank is used to transport cooling water to the cleaning pipelines and then back to the water tank. Because the pressure at the outlet is greater than the pressure at the return end, one or more outlet valves of the equipment units near the return end must be opened to ensure smooth circulation of the entire system's cleaning process, allowing the cleaned return water to circulate back into the water tank. However, various operations during construction often result in a large amount of impurities and waste remaining in the system. These impurities may include dust generated during construction, metal shavings, welding residues, and other equipment clogging problems. If equipment blockage occurs, the equipment must be opened to locate and clear the blockage before normal operation can resume. This delays the unit's operation and reduces the efficiency of the circulating water unit's cleaning and pre-filming process.

[0014] In view of the above, this application is hereby submitted. Utility Model Content

[0015] The purpose of this invention is to provide a device suitable for cleaning and pre-filming circulating water in natural gas purification plants. By adding additional pipelines and corresponding control valves, the connection method between the tail end of the first main water inlet pipeline and the tail end of the second main water inlet pipeline is changed, so as to solve the problem in the prior art that at least one equipment unit must be opened to allow the cleaned return water to circulate back to the water tank, which causes the equipment unit to be blocked and difficult to clean.

[0016] This utility model embodiment provides an apparatus suitable for pre-filming of circulating water in natural gas purification plants, comprising:

[0017] The cooling water outlet pipeline includes a first main inlet pipeline and a second main inlet pipeline connected in parallel. A first equipment unit is installed on the first main inlet pipeline, and the inlet of the first equipment unit is connected to the first main inlet pipeline. A second equipment unit is installed on the second main inlet pipeline, and the inlet of the second equipment unit is connected to the second main inlet pipeline.

[0018] The cooling water return pipeline includes a first main outlet pipeline and a second main outlet pipeline connected in parallel. The outlet of the first equipment unit is connected to the first main outlet pipeline, and the outlet of the second equipment unit is connected to the second main outlet pipeline.

[0019] A water tank is used to connect to the outlet end of the cooling water outlet pipe and the return end of the cooling water return pipe.

[0020] The first main outlet pipe is connected to the first main inlet pipe, the first main outlet pipe is connected to the first main inlet pipe, and the second main outlet pipe is connected to the first main inlet pipe; the last end of the first main inlet pipe is connected to the last end of the first main outlet pipe.

[0021] The tail end of the first main water inlet pipe and the tail end of the second main water inlet pipe are connected through an auxiliary pipe. The auxiliary pipe is equipped with a third equipment unit. The inlet of the third equipment unit is connected to the auxiliary pipe, and the outlet of the third equipment unit is connected to the second main water outlet pipe.

[0022] The first main water inlet pipe is equipped with a first control valve at its first end and a second control valve at its last end; the first main water outlet pipe is equipped with a third control valve at its last end and a fourth control valve at its first end.

[0023] The first end of the second main water inlet pipe is equipped with a fifth control valve, and the last end of the second main water outlet pipe is equipped with a sixth control valve. The first end of the second main water outlet pipe is equipped with a seventh control valve.

[0024] The auxiliary pipeline is provided with an eighth control valve and a ninth control valve in sequence from the second main water inlet pipeline to the first main water inlet pipeline, and the third equipment unit is located between the eighth control valve and the ninth control valve.

[0025] An additional pipeline is connected to the front side of the second control valve.

[0026] Optionally, a tenth control valve is connected in parallel to the sixth control valve, the nominal diameter of the tenth control valve being smaller than the nominal diameter of the sixth control valve.

[0027] Optionally, the nominal diameters of the first control valve, the second control valve, the third control valve, the fourth control valve, the fifth control valve, the sixth control valve, and the seventh control valve are equal.

[0028] The nominal diameters of the eighth, ninth, and tenth control valves are equal.

[0029] Optionally, a valve gate is provided on the additional pipeline between the sixth control valve and the eighth control valve.

[0030] Optionally, an eleventh control valve and a water pump are installed at the outlet end of the cooling water outlet pipe.

[0031] Optionally, a twelfth control valve is installed at the return end of the cooling water return pipe.

[0032] Optionally, the nominal diameter of the eleventh control valve is greater than that of the first control valve, and the nominal diameters of the eleventh control valve and the twelfth control valve are equal.

[0033] Optionally, the first equipment unit includes a dehydration unit, at least one tail gas unit, at least one desulfurization unit, and a sulfur recovery unit.

[0034] Optionally, each of the dehydration unit, the single exhaust gas unit, the single desulfurization unit, and the sulfur recovery unit in the first equipment unit is provided with an inlet valve on one side of the water inlet, and each of the outlets is provided with an outlet valve on one side of the water outlet.

[0035] Optionally, each of the second equipment units includes a dehydration unit, at least one tail gas unit, at least one desulfurization unit, and a sulfur recovery unit.

[0036] Optionally, the dehydration unit, the single exhaust gas unit, the single desulfurization unit, and the sulfur recovery unit in the second equipment unit are each equipped with an inlet valve on one side of the water inlet and an outlet valve on one side of the water outlet.

[0037] Optionally, the third equipment unit includes a sulfur forming unit.

[0038] Optionally, the inlet of the sulfur forming unit is connected to an additional pipeline, and its outlet is connected to a second main outlet pipeline. An inlet valve is provided on one side of the inlet of the sulfur forming unit, and an outlet valve is provided on one side of its outlet.

[0039] Compared with the prior art, the embodiments of this utility model have the following advantages and beneficial effects:

[0040] 1. Compared with the prior art, the present invention has the following advantages: By adding an additional pipeline to the outlet of the sixth control valve near the tail end of the second main water inlet pipeline, an eighth control valve and a ninth control valve are connected in series. The outlet of the ninth control valve is connected to the first main water inlet pipeline before the second control valve through the additional pipeline, and the first main water inlet pipeline connected to the second control valve at its tail end is directly connected to the circulating cooling water return pipeline. Thus, the return water after cleaning the first and second main water inlet pipelines can be directly returned to the circulating cooling water pool through the circulating cooling water return pipeline. This effectively solves the technical problem in the prior art that it is necessary to open the inlet and outlet valves of one or more devices (such as the exhaust gas unit, sulfur recovery unit, etc.) near the outlet end of the first main water inlet pipeline in order to ensure the smooth circulation and cleaning process of the entire system. However, a large amount of impurities and wastes remaining in the equipment will cause equipment blockage. The equipment can only be opened to find the blockage and clean it before it can operate normally, which will delay the operation of the device.

[0041] 2. By connecting a tenth control valve with a nominal diameter in parallel at the sixth control valve near the end of the second main water inlet pipeline, the circulating water pressure of the pipeline is increased. By installing a valve gate, dirty water in the system is discharged to avoid the risk of dust, metal shavings, welding residues and other clogging of equipment.

[0042] In general, the device for pre-filming and cleaning circulating water in natural gas purification plants provided by the embodiments of this utility model changes the connection between the tail end of the first main water inlet pipe and the tail end of the second main water inlet pipe by adding additional pipelines and corresponding control valves, so as to achieve the purpose of independently controlling the circulating cleaning of the circulating pipeline without opening the equipment unit. Attached Figure Description

[0043] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0044] Figure 1 This is a schematic diagram of a circulating water cleaning and pre-filming device in the prior art;

[0045] Figure 2 A schematic diagram of the circulating water cleaning and pre-filming device provided in an embodiment of this utility model;

[0046] Figure 3 for Figure 2 Enlarged view of point A in the middle.

[0047] The attached diagram shows the markings and corresponding component names:

[0048] 1-First main water inlet pipe, 2-Second main water inlet pipe, 3-First equipment unit, 4-Second equipment unit, 5-First main water outlet pipe, 6-Second main water outlet pipe, 7-Water tank, 8-Additional pipe, 9-Third equipment unit, 10-First control valve, 11-Second control valve, 12-Third control valve, 13-Fourth control valve, 14-Fifth control valve, 15-Sixth control valve, 16-Seventh control valve, 17-Eighth control valve, 18-Ninth control valve, 19-Tenth control valve, 20-Valve gate, 21-Eleventh control valve, 22-Twelfth control valve, 23-Dehydration unit, 24-Tail gas unit, 25-Desulfurization unit, 26-Sulfur recovery unit, 27-Sulfur forming unit, 28-Water inlet valve, 29-Water outlet valve, 30-P-12001A unit. Detailed Implementation

[0049] 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 embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can typically be arranged and designed in various different configurations.

[0050] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0051] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0052] In the description of this utility model, it should be noted that the terms "first", "second", "third", etc. are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance.

[0053] Example

[0054] Reference Figure 1As shown, the existing natural gas purification plant circulating water unit cleaning and pre-filming process includes: a cooling water outlet pipe and a cooling water return pipe respectively connected to the circulating cooling water tank 7. The outlet end of the circulating cooling water outlet pipe is connected in parallel to a first main inlet pipe 1 and a second main inlet pipe 2. The first main inlet pipe 1 is connected to a first equipment unit 3 (including P-12001A unit 30, dehydration unit 23, desulfurization unit 25, tail gas unit 24, sulfur recovery unit 26, etc.) through an inlet valve 28. The second main inlet pipe 2 is connected to the first equipment unit 3 through an inlet valve 28. The second equipment unit 4 (including dehydration unit 23, desulfurization unit 25, tail gas unit 24, sulfur recovery unit 26, etc.) has its tail ends connected to the first main water inlet pipe 1 and the second main water inlet pipe 2. A first control valve 10 is connected to the first main water inlet pipe 1 near its head end, and a second control valve 11 is connected to the first main water inlet pipe 1 near its tail end. A fifth control valve 14 is connected to the second main water inlet pipe 2 near its head end, and a sixth control valve 15 is connected to the second main water inlet pipe 2 near its tail end. The tail end of water pipe 2 is connected to sulfur forming unit 27 via inlet valve 28; the inlet end of circulating water cooling water return pipe is connected in parallel to first main outlet pipe 5 and second main outlet pipe 6. The first main outlet pipe 5 is connected to the outlet end of first equipment unit 3 connected to first main inlet pipe 1 via outlet valve 29. The second main outlet pipe 6 is connected to the outlet end of second equipment unit 4 connected to second main inlet pipe 2 via outlet valve 29. The inlet end of the first main outlet pipe 5 is connected to the first main inlet pipe 1 before the first control valve 10. A fourth control valve 13 is connected to the first main outlet pipe 5 near its head end. A third control valve 12 is connected to the first main outlet pipe 5 near its tail end. The head end of the second main outlet pipe 6 is connected to the second main inlet pipe 2 before the fifth control valve 14. A seventh control valve 16 is connected to the second main outlet pipe 6 near its head end. An outlet valve 29 is connected to the first main outlet pipe 5 near its tail end. The inlet end of the outlet valve 29 in the first main outlet pipe 5 is connected to the outlet end of the sulfur forming unit 27 connected to the inlet valve 28 in the first main inlet pipe 1.

[0055] Specifically, the cleaning process of the existing natural gas purification plant circulating water cleaning and pre-filming process is as follows:

[0056] First, close all circulating water inlet valves 28 and outlet valves 29 for the small units;

[0057] Cleaning the first main water inlet pipe 1 and the device installed on it:

[0058] 1) Open the eleventh control valve 21, and the water flows out sequentially through the first control valve 10, the second control valve 11, and the inlet valve 28 of the sulfur forming unit 27. Close all other valves and turn on the water pump.

[0059] 2) Close the seventh control valve 16, open the fourth control valve 13 → the third control valve 12 → the outlet valve 29 of the sulfur forming unit 27 → the twelfth control valve 22, and the cleaned return water flows back to the circulating cooling water pool 7 through the circulating cooling water return pipeline.

[0060] Cleaning the second main water inlet pipe 2 and the device installed on it:

[0061] 1) Open the water pump and the eleventh control valve 21 on the circulating water cooling water outlet pipe. The water will pass through the opened fifth control valve 14 → sixth control valve 15 → inlet valve 28 of sulfur forming unit 27 in sequence. All other valves are closed. Turn on the water pump.

[0062] 2) Close the fourth control valve 13 and the third control valve 12, and open the seventh control valve 16 → the outlet valve 29 of the sulfur forming unit 27 → the twelfth control valve 22 on the circulating water cooling water return pipeline. The cleaned return water flows back to the circulating cooling water pool 7 through the circulating water cooling water return pipeline.

[0063] In view of this, the inventors discovered in the actual cleaning and pre-filming process that, because the pressure at the inlet end of the first main inlet pipe 1 is greater than the pressure at the outlet end, it is necessary to open the inlet valve 28 and outlet valve 29 of one or more devices (such as the exhaust gas unit 24, sulfur recovery unit 26, etc.) near the outlet end of the first main inlet pipe 1 to ensure smooth circulation of the entire system's cleaning process. That is, the returned water after cleaning must pass through at least one device unit before flowing back to the circulating cooling water pool 7 via the circulating cooling water return pipe. However, due to various operations during construction, a large amount of impurities and waste often remain in the system. These impurities may include dust generated during construction, metal shavings, welding residues, and other problems that clog equipment. If equipment blockage occurs, the equipment must be opened to find and clean the blockage before normal operation can resume. This delays the operation of the device and reduces the efficiency of the circulating water device's cleaning and pre-filming process.

[0064] To address the aforementioned problems, this utility model provides an apparatus suitable for pre-filming the circulating water in a natural gas purification plant, employing the following technical solution, in conjunction with reference to... Figure 2 and Figure 3 As shown.

[0065] The system includes a circulating cooling water outlet pipe and a circulating cooling water return pipe, both connected to the circulating cooling water pool 7. The outlet end of the circulating cooling water outlet pipe is connected in parallel to a first main inlet pipe 1 and a second main inlet pipe 2. The first main inlet pipe 1 is connected to a first equipment unit 3 (including, for example, P-12001A unit 30, dehydration unit 23, desulfurization unit 25, tail gas unit 24, sulfur recovery unit 26, etc.) via an inlet valve 28. The second main inlet pipe 2 is connected to a second equipment unit 4 (including, for example, dehydration unit 23, desulfurization unit 25, tail gas unit 24, sulfur recovery unit 26, etc.) via an inlet valve 28. A first control valve 10 is connected to the first main water inlet pipe 1 near its head, and a second control valve 11 is connected to the first main water inlet pipe 1 near its tail. The tail of the first main water inlet pipe 1 is connected to the circulating cooling water return pipe. A fifth control valve 14 is connected to the second main water inlet pipe 2 near its head, and a sixth control valve 15 and a tenth control valve 19 are connected in parallel to the second main water inlet pipe 2 near its tail. The outlets of the sixth control valve 15 and the tenth control valve 19 are connected in series with an eighth control valve 17 and a ninth control valve 18 via an auxiliary pipe 8. The outlet of the ninth control valve 18 is connected in series with an auxiliary pipe 8. The first main inlet pipe 1 before the second control valve 11 is connected to the pipeline between the eighth control valve 17 and the ninth control valve 18. A sulfur forming unit 27 is connected to the pipeline between them via an inlet valve 28. The inlet end of the circulating cooling water return pipe is connected in parallel to the first main outlet pipe 5 and the second main outlet pipe 6. The first main outlet pipe 5 is connected to the outlet end of the first equipment unit 3 connected to the first main inlet pipe 1 via an outlet valve 29. The second main outlet pipe 6 is connected to the outlet ends of multiple equipment units connected to the second main inlet pipe 2 via an outlet valve 29. The inlet end of the first main outlet pipe 5 is connected to the first control valve 10. The first main water inlet pipe 1 is connected to the first main water outlet pipe 5. A fourth control valve 13 is connected to the first main water outlet pipe 5 near its inlet end. A third control valve 12 is connected to the first main water outlet pipe 5 near its outlet end. The inlet end of the second main water outlet pipe 6 is connected to the second main water inlet pipe 2 before the fifth control valve 14. A seventh control valve 16 is connected to the second main water outlet pipe 6 near its head end. An outlet valve 29 is connected to the second main water outlet pipe 6 near its tail end. The inlet end of the outlet valve 29 on the second main water outlet pipe 6 is connected to the outlet end of the sulfur forming unit 27 connected to the inlet valve 28 on the accessory pipe.

[0066] In a preferred embodiment of this utility model, a valve slide plate 20 is connected to the additional pipeline 8 at the eighth control valve 17. This allows the valve slide plate 20 to be opened to drain dirty water from the system during cleaning of the entire device. The nominal diameter of the tenth control valve 19 is smaller than that of the sixth control valve 15. The nominal diameters of the first control valve 10, second control valve 11, third control valve 12, fourth control valve 13, fifth control valve 14, sixth control valve 15, and seventh control valve 16 are equal. The nominal diameters of the eighth control valve 17, ninth control valve 18, and tenth control valve 19 are equal. The nominal diameter of the eleventh control valve 21 is larger than that of the first control valve 10, and the nominal diameters of the eleventh control valve 21 and twelfth control valve 22 are equal. For example, the nominal diameters of the first control valve 10, second control valve 11, third control valve 12, fourth control valve 13, fifth control valve 14, sixth control valve 15, and seventh control valve 16 are all 600 cm; the nominal diameters of the eighth control valve 17, ninth control valve 18, and tenth control valve 19 are all 250 cm; the nominal diameters of the eleventh control valve 21 and twelfth control valve 22 are both 800 cm; and the nominal diameters of the inlet valve 28 and outlet valve 29 of the equipment unit are both less than 200 cm. By using the tenth control valve 19 with a smaller nominal diameter, this embodiment of the invention can increase the water pressure on the second main inlet pipe 2 according to actual needs.

[0067] To better understand the solution of this utility model embodiment, the specific operation control will be illustrated below. For example, the cleaning process includes the following: first, close the circulating water inlet valve 28 and outlet valve 29 of all equipment units.

[0068] Cleaning the first main water inlet pipe 1 and the device installed on it:

[0069] 1) Open the eleventh control valve 21 on the circulating water cooling water outlet pipe. The water will pass through the first control valve 10 and the second control valve 11 in sequence. All other valves are closed.

[0070] 2) Open the fourth control valve 13 → the third control valve 12 → the twelfth control valve 22 on the circulating water cooling water return pipe. As a result, the water flowing out of the circulating water cooling water outlet pipe can clean the first main water inlet pipe 1 and the first main water outlet pipe 5 (main water pipe cleaning). The cleaned return water flows back to the circulating cooling water pool 7 through the circulating water cooling water return pipe.

[0071] After the impurities from the above cleaning process are circulated to the water tank 7, the corresponding equipment unit in the first equipment unit 3 is opened according to actual needs (i.e., the corresponding inlet valve 28 and outlet valve 29 are opened). This not only prevents impurities from clogging the first equipment unit 3, but also effectively cools the first equipment unit 3.

[0072] Cleaning the second main water inlet pipe 2 and the device installed on it:

[0073] 1) Open the eleventh control valve 21 on the circulating water cooling water outlet pipe. The water will pass through the open fifth control valve 14 → fifth control valve 14 → tenth control valve 19 → eighth control valve 17 → ninth control valve 18 → second control valve 11 in sequence. All other valves are closed.

[0074] 2) Open the seventh control valve 16 → the twelfth control valve 22 on the circulating water cooling water return pipe, and close all other valves. As a result, the water flowing out of the circulating water cooling water outlet pipe can clean the second main water inlet pipe 2 and the second main water outlet pipe 6 (main water pipe cleaning). The cleaned return water flows back to the circulating cooling water pool 7 through the circulating water cooling water return pipe.

[0075] After the impurities from the above cleaning process are circulated to the water tank 7, the corresponding equipment units in the second equipment unit 4 are opened according to actual needs (i.e., the corresponding inlet valve 28 and outlet valve 29 are opened). This not only avoids impurities from clogging the second equipment unit 4, but also effectively cools the second equipment unit 4.

[0076] Clean other devices:

[0077] 1) Open the eleventh control valve 21 on the circulating water cooling water outlet pipe. The water will pass through the opened fifth control valve 14 → tenth control valve 19 → eighth control valve 17 → ninth control valve 18 → inlet valve 28 of sulfur forming unit 27 → second control valve 11 in sequence. All other valves are closed.

[0078] 2) Open the outlet valve 29 of the sulfur forming unit 27 → the twelfth control valve 22 on the circulating water cooling water return pipeline, and close all other valves.

[0079] This operation can be performed after the main water pipeline has been cleaned to prevent impurities from clogging the third equipment unit 9 (sulfur forming unit 27).

[0080] Clean all equipment:

[0081] First, close the circulating water inlet valve 28 and outlet valve 29 of all equipment units;

[0082] 1) Open the eleventh control valve 21 on the circulating cooling water outlet pipe. The water will pass through the first control valve 10, the second control valve 11, the fifth control valve 14, the tenth control valve 19, the eighth control valve 17, the ninth control valve 18, and the inlet valve 28 of the sulfur forming unit 27 in sequence. Open the valve slide plate 20 to discharge the dirty water in the system and avoid the risk of dust, metal shavings, welding residues, and other blockages in the equipment.

[0083] In general, compared with the prior art, the present invention has the following advantages: A sixth control valve 15 is connected in parallel at the sixth control valve 15 near the tail end of the second main water inlet pipe 2. The outlets of the sixth control valve 15 and the sixth control valve 15 are connected in series via an auxiliary pipe 8 to an eighth control valve 17 and a ninth control valve 18. The outlet of the ninth control valve 18 is connected to the first main water inlet pipe 1 before the second control valve 11 via the auxiliary pipe 8. The first main water inlet pipe 1, with the second control valve 11 connected to its tail end, is directly connected to the circulating water cooling water return pipe. This allows the first main water inlet pipe to be connected to the second control valve 11. The return water after cleaning of pipeline 1 and the second main inlet pipeline 2 flows directly back to the circulating cooling water pool 7 through the circulating cooling water return pipeline. This effectively solves the technical problem in the prior art where it is necessary to open the inlet valve 28 and outlet valve 29 of one or more devices (such as tail gas unit 24, sulfur recovery unit 26, etc.) near the outlet end of the first main inlet pipeline 1 in order to ensure smooth circulation and cleaning of the entire system. However, a large amount of impurities and waste remaining in the equipment will cause blockage. The equipment can only be opened to find and clean the blockage before it can operate normally, which will delay the operation of the device.

[0084] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model. It should be noted that the structures or components illustrated in the accompanying drawings are not necessarily drawn to scale, and descriptions of well-known components, processing techniques, and processes are omitted to avoid unnecessarily limiting the utility model.

Claims

1. A device suitable for pre-filming of circulating water in a natural gas purification plant, characterized in that, include: The cooling water outlet pipeline includes a first main water inlet pipeline (1) and a second main water inlet pipeline (2) connected in parallel. A first equipment unit (3) is provided on the first main water inlet pipeline (1), and the water inlet of the first equipment unit (3) is connected to the first main water inlet pipeline (1). A second equipment unit (4) is provided on the second main water inlet pipeline (2), and the water inlet of the second equipment unit (4) is connected to the second main water inlet pipeline (2). The cooling water return pipeline includes a first main outlet pipeline (5) and a second main outlet pipeline (6) connected in parallel. The outlet of the first equipment unit (3) is connected to the first main outlet pipeline (5), and the outlet of the second equipment unit (4) is connected to the second main outlet pipeline (6). A water tank (7) is used to connect to the outlet end of the cooling water outlet pipe and the return end of the cooling water return pipe; Wherein, the first end of the first main outlet pipe (5) is connected to the first end of the first main inlet pipe (1), the first end of the second main outlet pipe (6) is connected to the first end of the second main inlet pipe (2), and the last end of the first main inlet pipe (1) is connected to the last end of the first main outlet pipe (5). The tail end of the first main water inlet pipe (1) and the tail end of the second main water inlet pipe (2) are connected through an auxiliary pipe (8). The auxiliary pipe (8) is equipped with a third equipment unit (9). The inlet of the third equipment unit (9) is connected to the auxiliary pipe (8), and the outlet of the third equipment unit (9) is connected to the second main water outlet pipe (6). The first main water inlet pipe (1) is provided with a first control valve (10) at its head end and a second control valve (11) at its tail end. The first main water outlet pipe (5) is provided with a third control valve (12) at its tail end and a fourth control valve (13) at its head end. The first end of the second main water inlet pipe (2) is provided with a fifth control valve (14), and the last end of the second main water outlet pipe (6) is provided with a sixth control valve (15). The additional pipeline (8) is provided with an eighth control valve (17) and a ninth control valve (18) in sequence from the second main water inlet pipeline (2) to the first main water inlet pipeline (1), and the third equipment unit (9) is located between the eighth control valve (17) and the ninth control valve (18). The additional pipeline (8) is connected to the front side of the second control valve (11).

2. The apparatus for pre-filming and cleaning circulating water in a natural gas purification plant according to claim 1, characterized in that, The sixth control valve (15) is connected in parallel with a tenth control valve (19), and the nominal diameter of the tenth control valve (19) is smaller than the nominal diameter of the sixth control valve (15).

3. The apparatus for pre-filming circulating water cleaning in a natural gas purification plant according to claim 2, characterized in that, The nominal diameters of the first control valve (10), the second control valve (11), the third control valve (12), the fourth control valve (13), the fifth control valve (14), the sixth control valve (15), and the seventh control valve (16) are equal. The nominal diameters of the eighth control valve (17), the ninth control valve (18), and the tenth control valve (19) are equal.

4. The apparatus for pre-filming and cleaning circulating water in a natural gas purification plant according to claim 1, characterized in that, A valve gate (20) is provided on the additional pipeline (8) between the sixth control valve (15) and the eighth control valve (17).

5. A device for pre-filming circulating water cleaning in a natural gas purification plant according to any one of claims 1-4, characterized in that, The outlet end of the cooling water outlet pipe is equipped with an eleventh control valve (21) and a water pump.

6. The apparatus for pre-filming circulating water cleaning in a natural gas purification plant according to claim 5, characterized in that, The cooling water return pipe is equipped with a twelfth control valve (22) at the return end.

7. The apparatus for pre-filming circulating water cleaning in a natural gas purification plant according to claim 6, characterized in that, The nominal diameter of the eleventh control valve (21) is greater than that of the first control valve (10), and the nominal diameters of the eleventh control valve (21) and the twelfth control valve (22) are equal.

8. The apparatus for pre-filming and cleaning circulating water in a natural gas purification plant according to claim 1, characterized in that, The first equipment unit (3) includes a dehydration unit (23), at least one tail gas unit (24), at least one desulfurization unit (25), and a sulfur recovery unit (26).

9. The apparatus for pre-filming and cleaning circulating water in a natural gas purification plant according to claim 8, characterized in that, The dehydration unit (23), the single tail gas unit (24), the single desulfurization unit (25) and the sulfur recovery unit (26) in the first equipment unit (3) are each equipped with an inlet valve on one side of the water inlet and an outlet valve on one side of the water outlet.

10. The apparatus for pre-filming circulating water cleaning in a natural gas purification plant according to claim 1, characterized in that, The second equipment unit (4) includes a dehydration unit (23), at least one tail gas unit (24), at least one desulfurization unit (25), and a sulfur recovery unit (26).

11. The apparatus for pre-filming circulating water cleaning in a natural gas purification plant according to claim 10, characterized in that, The dehydration unit (23), single tail gas unit (24), single desulfurization unit (25) and sulfur recovery unit (26) in the second equipment unit (4) are each equipped with an inlet valve (28) on one side of the water inlet and an outlet valve (29) on one side of the water outlet.

12. The apparatus for pre-filming and cleaning circulating water in a natural gas purification plant according to claim 1, characterized in that, The third equipment unit (9) includes a sulfur forming unit (27).

13. The apparatus for pre-filming circulating water cleaning in a natural gas purification plant according to claim 12, characterized in that, The inlet of the sulfur forming unit (27) is connected to the additional pipeline (8), and its outlet is connected to the second main outlet pipeline (6). The inlet of the sulfur forming unit (27) is provided with an inlet valve, and its outlet is provided with an outlet valve.

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