Liquid ring type compressor unit for sulfur-containing natural gas

Abstract

The invention discloses a liquid ring type compressor unit for sulfur-containing natural gas, which relates to the technical field of natural gas pretreatment and comprises a gas inlet pipeline, a first liquid ring compressor, a second liquid ring compressor, a gas-liquid separator, a circulating pipeline, a cooling device and a pH value debugging unit, the sulfur-containing natural gas is compressed by the compressor to form a gas-liquid mixture, the gas-liquid mixture is separated in the gas-liquid separator, and the separated working liquid is cooled and recycled. The pH value debugging unit comprises a pH value adjusting tank, a pH sensor and an automatic dosing device, the pH value of the working solution is maintained in a weakly alkaline range by automatically adding an alkaline neutralizer, and dissolved acidic components such as H2S are effectively neutralized, so that the problem of acidic corrosion of the working solution is fundamentally solved, and the safety and environmental protection property of system operation are improved; and the two compressors are arranged in parallel, so that the reliability and the processing capacity of the system are improved, and flexible adjustment of loads and reasonable utilization of energy are realized.

Description

Technical Field

[0001] This application relates to the technical field of natural gas pretreatment, and in particular to a liquid ring compressor unit for sulfur-containing natural gas. Background Technology

[0002] In the processes of natural gas extraction, gathering, transportation, and liquefaction, natural gas containing acidic gases such as hydrogen sulfide and carbon dioxide is often encountered, hereinafter referred to as "sulfur-containing natural gas." These gases are highly corrosive, posing a severe challenge to the selection of materials and the operational reliability of compression equipment.

[0003] Currently, liquid ring compressors are widely used in the pressurization stage of sulfur-containing natural gas due to their advantages such as internal compression, low temperature rise, and resistance to droplets. Their basic working principle involves using a working fluid (usually water or a special liquid) to form a liquid ring within the pump chamber to compress the gas. Existing liquid ring compressor units typically include a liquid ring compressor, a vapor-liquid separator, a cooling circulation system, and a mechanical seal flushing system. The basic workflow is as follows: after the sulfur-containing natural gas is compressed by the compressor, the resulting gas-liquid mixture is separated in the vapor-liquid separator. The separated gas then enters the next process, while the working fluid is cooled by the cooling circulation system and returned to the liquid ring compressor for reuse. The mechanical seal flushing system provides cooling and lubrication for the mechanical seal of the liquid ring compressor.

[0004] However, during the compression of sulfur-containing natural gas, acidic gases such as H2S in the natural gas dissolve in the working fluid, forming a weakly acidic corrosive liquid. This acidic working fluid continuously circulates within the system, causing ongoing corrosion to critical equipment such as the liquid ring compressor body, circulation pipelines, cooling devices, and vapor-liquid separators, severely impacting equipment lifespan and operational reliability. Furthermore, the dissolved H2S may re-precipitate when system pressure or temperature fluctuates, posing safety and environmental pollution risks. While this problem can be mitigated by periodically discharging and replacing the working fluid, this results in high working fluid consumption, increased operating costs, and the generation of acidic wastewater requiring treatment, failing to meet energy conservation and environmental protection requirements.

[0005] Therefore, there is an urgent need for a technical solution that can be integrated into the liquid ring compressor unit, neutralize the acidity of the working fluid online, thereby fundamentally inhibiting system corrosion, extending equipment life, and improving operational safety and environmental protection. Summary of the Invention

[0006] To address the problems existing in the prior art, this application provides a liquid ring compressor unit for sulfur-containing natural gas.

[0007] This application provides a liquid ring compressor unit for sulfur-containing natural gas, which adopts the following technical solution: A liquid ring compressor unit for sulfur-containing natural gas includes: The intake pipeline is used to transport sulfur-containing natural gas; The first liquid ring compressor and the second liquid ring compressor are arranged in parallel, and the intake pipes are respectively connected to the inlets of the first liquid ring compressor and the second liquid ring compressor, for compressing sulfur-containing natural gas to form a gas-liquid mixture; A vapor-liquid separator is connected to the outlets of the first liquid ring compressor and the second liquid ring compressor via a vapor-liquid delivery pipe. It is used to separate compressed natural gas and working fluid. An exhaust pipe is provided at the top of the vapor-liquid separator. A circulation pipeline is connected to the bottom of the vapor-liquid separator, and the circulation pipeline is connected to the first liquid ring compressor and the second liquid ring compressor respectively. A circulation pump is installed on the circulation pipeline. A cooling device, installed on the circulation pipeline, is used to cool and reduce the temperature of the working fluid in the circulation pipeline; The pH adjustment unit is installed on the circulation pipeline, located between the cooling device and the vapor-liquid separator, and is used to adjust the pH value of the working fluid in the circulation pipeline.

[0008] Optionally, both the first liquid ring compressor and the second liquid ring compressor are connected to a pressure relief pipe, and a pressure stabilizing valve is installed on the pressure relief pipe.

[0009] Optionally, a wire mesh demister is provided inside the vapor-liquid separator and near the top. The end of the gas-liquid conveying pipe that connects to the vapor-liquid separator is located below the wire mesh demister, and the end of the exhaust pipe that connects to the vapor-liquid separator is located above the wire mesh demister.

[0010] Optionally, the pH adjustment unit includes a pH adjustment tank, a pH sensor, and an automatic dosing device. The pH adjustment tank is provided with an inlet and an outlet, both of which are connected to a circulation pipeline. The pH sensor is installed inside the pH adjustment tank to detect the pH value of the working solution. The automatic dosing device is used to add an alkaline neutralizing agent to the pH adjustment tank to maintain the pH value of the working solution within a slightly alkaline range.

[0011] Optionally, the automatic dosing device includes a storage tank, a delivery pipe, and an automatic dosing pump. The delivery pipe is connected to the storage tank and the pH adjustment tank, respectively. The automatic dosing pump is installed on the delivery pipe. The pH sensor is electrically connected to a controller, and the controller is electrically connected to the automatic dosing pump.

[0012] Optionally, a spiral mixing pipe is fixedly installed inside the pH adjustment tank. The spiral mixing pipe is connected to the water inlet, and the drug delivery pipe is connected to the spiral mixing pipe. The end of the drug delivery pipe connected to the spiral mixing pipe is close to the water inlet.

[0013] Optionally, a central tube is fixedly installed inside the pH adjustment tank, with an opening at the top of the central tube. The outlet is located at the bottom of the pH adjustment tank and communicates with the central tube. A permeate layer is also installed inside the pH adjustment tank, and the central tube penetrates the permeate layer. The spiral mixing pipe extends to the bottom of the permeate layer.

[0014] Optionally, a pulse generator is installed on the circulation pipeline between the pH adjustment tank and the cooling device.

[0015] Optionally, a backflush pipe is also connected to the circulation pipeline between the pulse generator and the cooling device. The backflush pipe is connected to the pH adjustment tank, and the connection end between the backflush pipe and the pH adjustment tank is located below the permeate layer.

[0016] Optionally, the pH adjustment tank is connected to a drain pipe, the end of which connects to the pH adjustment tank is located below the permeate layer, and a shut-off valve is provided on the drain pipe.

[0017] In summary, this application includes at least one of the following beneficial technical effects: 1. This application utilizes a parallel configuration of a first liquid ring compressor and a second compressor, allowing for flexible adjustment of the number of operating units based on actual operating conditions. This enables the distribution of liquid flow, effectively preventing excessively high or low pressure within the entire unit and ensuring overall operational stability. Furthermore, by incorporating a pH adjustment unit, online monitoring and automatic adjustment of the circulating working fluid's pH value are achieved, maintaining the working fluid within a slightly alkaline range. This effectively neutralizes dissolved acidic components such as H2S, fundamentally solving the problem of acidic corrosion from the working fluid. Compared to existing technologies, this solution eliminates the need for frequent working fluid replacement, significantly reducing operating costs and wastewater treatment burden. Simultaneously, it substantially extends the service life of critical equipment such as compressors, pipelines, and cooling devices, enhancing the overall safety and environmental friendliness of the unit.

[0018] 2. The pH adjustment unit of this application, through the integrated design of pH sensor, automatic dosing device and pH adjustment tank, realizes real-time monitoring and automatic adjustment of working fluid pH value, ensures that the neutralization reaction is fully carried out, accurately controls the working fluid pH value within the weakly alkaline range, effectively inhibits acid corrosion, and avoids waste caused by excessive dosing or other problems caused by excessive alkalinity.

[0019] 3. This application uses a spiral mixing tube to ensure that the working solution and the alkaline neutralizing agent are fully mixed before entering the pH adjustment tank, which improves the efficiency and uniformity of the neutralization reaction, ensures that the pH value of the working solution quickly reaches the set range, reduces reaction time, and improves the system response speed.

[0020] 4. This application uses a combination design of a central tube and a percolation layer to create an upward flow of the working fluid within the pH adjustment tank. Through the filtration and adsorption of the percolation layer, trace amounts of hydrocarbon liquids and solid particles carried in the working fluid are further removed, keeping the working fluid clean, reducing wear on the compressor and pipelines, and extending the service life of the working fluid.

[0021] 5. This application, through the setting of the backwash pipe and the periodic operation of the pulse generator, can periodically backwash the percolation media layer, remove trapped impurities and deposits, restore the filtration capacity of the percolation media layer, extend the service life of the filter media, and reduce the frequency of maintenance. Attached Figure Description

[0022] Figure 1 This is a process flow diagram of an embodiment of this application; Figure 2 This is a schematic diagram illustrating the structure of a pH adjustment tank according to an embodiment of this application.

[0023] Explanation of reference numerals in the attached diagram: 1. Inlet pipe; 2. First liquid ring compressor; 3. Second liquid ring compressor; 4. Vapor-liquid separator; 41. Gas-liquid delivery pipe; 42. Exhaust pipe; 43. Wire mesh demister; 5. Circulation pipe; 51. Circulation pump; 52. Pulse generator; 53. Backflush pipe; 6. Cooling device; 7. pH adjustment unit; 71. pH adjustment tank; 711. Water inlet; 712. Water outlet; 713. Spiral mixing pipe; 714. Central tube; 715. Permeate layer; 716. Drain pipe; 717. Shut-off valve; 72. pH sensor; 73. Drug storage tank; 74. Drug delivery pipe; 75. Automatic dosing pump; 8. Pressure relief pipe; 81. Pressure stabilizing valve. Detailed Implementation

[0024] The following will be combined with the appendix Figure 1 - Appendix Figure 2 The technical solutions in the embodiments of the present invention are clearly and completely described herein. The described embodiments are only possible technical implementations of the present invention and not all possible implementations. Those skilled in the art can obtain other embodiments in conjunction with the embodiments of the present invention without creative effort, and these embodiments are also within the protection scope of the present invention.

[0025] This application primarily employs a parallel dual compressor and pH adjustment unit to process sulfur-containing natural gas, achieving the effects of neutralizing the acidity of the working fluid, inhibiting system corrosion, and extending equipment life. The following is a further detailed description of this application: This application discloses a liquid ring compressor unit for sulfur-containing natural gas. (Refer to...) Figure 1The system includes an intake pipe 1, a first liquid ring compressor 2, a second liquid ring compressor 3, a vapor-liquid separator 4, a circulation pipe 5, a cooling device 6, and a pH adjustment unit 7. The first liquid ring compressor 2 and the second liquid ring compressor 3 are connected in parallel. The intake pipe 1 is connected to the inlets of both the first and second liquid ring compressors. The vapor-liquid separator 4 is connected to the outlets of both the first and second liquid ring compressors via a vapor-liquid delivery pipe 41. The circulation pipe 5 is connected to the vapor-liquid separator 4 and also to both the first and second liquid ring compressors. The cooling device 6 is installed on the circulation pipe 5. The pH adjustment unit 7 is installed on the circulation pipe 5 and located between the cooling device 6 and the vapor-liquid separator 4. By automatically adding an alkaline neutralizing agent, the pH value of the working fluid is maintained in a weakly alkaline range, effectively neutralizing dissolved acidic components such as H2S, fundamentally solving the problem of acid corrosion in the working fluid, and improving the safety and environmental friendliness of the system operation.

[0026] Reference Figure 1 Specifically, intake pipe 1 is used to transport sulfur-containing natural gas. Intake pipe 1 is generally made of corrosion-resistant metal pipe, such as stainless steel pipe; alternatively, corrosion-resistant composite material pipes, such as fiberglass pipe, can also be used. The inner wall of intake pipe 1 is usually treated with anti-corrosion coating to prevent corrosion from the sulfur-containing natural gas. Intake pipe 1 is connected to the inlet of the first liquid ring compressor 2 and the second liquid ring compressor 3 via flanges. This connection method facilitates installation and disassembly and provides good sealing performance.

[0027] Reference Figure 1 The function of the first liquid ring compressor 2 and the second liquid ring compressor 3 is to compress sulfur-containing natural gas to form a gas-liquid mixture. Impellers are rotatably installed within the pump chambers of both the first liquid ring compressor 2 and the second liquid ring compressor 3. These impellers are typically made of metal materials, such as carbon steel or stainless steel, and rotate at high speed driven by a motor. The working fluid forms a liquid ring within the pump chamber, compressing the sulfur-containing natural gas entering the pump chamber as the impeller rotates. The number of operating units of the first liquid ring compressor 2 and the second liquid ring compressor 3 can be flexibly adjusted according to actual operating conditions. When the natural gas flow rate is high, both compressors can be operated simultaneously; when the flow rate is low, only one needs to be operated. This effectively avoids excessively high or low pressure within the entire unit, ensuring the stability of the entire unit's operation.

[0028] Reference Figure 1Both the first liquid ring compressor 2 and the second liquid ring compressor 3 are connected to a pressure relief pipe 8, and a pressure regulating valve 81 is installed on the pressure relief pipe 8. The pressure relief pipe 8 is generally made of the same material as the compressor connecting pipe, such as stainless steel. The pressure regulating valve 81 can be a spring-loaded pressure regulating valve 81 or a pilot-operated pressure regulating valve 81. Its function is to automatically relieve pressure when the compressor is overpressured, effectively protecting the compressor body and system pipelines, and preventing equipment damage and safety accidents caused by abnormal pressure rise. When the pressure inside the compressor exceeds the set value, the pressure regulating valve 81 opens, releasing the excess pressure to the outside, thereby ensuring the normal operation of the compressor.

[0029] Reference Figure 1 The gas-liquid separator 4 is used to separate compressed natural gas and working fluid. The gas-liquid separator 4 is typically a cylindrical tank made of carbon steel or stainless steel. A gas-liquid conveying pipe 41 transports the gas-liquid mixture into the gas-liquid separator 4. Utilizing the density difference between the gas and liquid, the gas rises and the liquid sinks, thus achieving gas-liquid separation. An exhaust pipe 42 is installed at the top of the gas-liquid separator 4, through which the separated gas enters the next process.

[0030] Reference Figure 1 A wire mesh demister 43 is installed inside the vapor-liquid separator 4, near the top. The connection end of the gas-liquid conveying pipe 41 to the vapor-liquid separator 4 is located below the wire mesh demister 43, and the connection end of the exhaust pipe 42 to the vapor-liquid separator 4 is located above the wire mesh demister 43. The wire mesh demister 43 is typically made of metal wire mesh, such as stainless steel wire mesh, and is disc-shaped or cylindrical, mounted on a bracket inside the vapor-liquid separator 4. When the gas-liquid mixture enters the vapor-liquid separator 4, the gas rises and passes through the wire mesh demister 43, where the entrained liquid droplets are captured by the wire mesh, thereby improving the gas-liquid separation efficiency, ensuring the dryness of the discharged gas, reducing working fluid loss, and preventing droplets from entering downstream equipment and causing corrosion or affecting subsequent processes.

[0031] Reference Figure 1 The connection end of the circulation pipeline 5 to the vapor-liquid separator 4 is close to the bottom of the vapor-liquid separator 4, and a circulation pump 51 is installed on the circulation pipeline 5. The circulation pipeline 5 also uses corrosion-resistant pipe materials, such as stainless steel pipes. The function of the circulation pump 51 is to provide power to circulate the working fluid in the circulation pipeline 5, and to transport the working fluid from the vapor-liquid separator 4 to the first liquid ring compressor 2 and the second liquid ring compressor 3. The circulation pump 51 is generally a centrifugal pump.

[0032] Reference Figure 1The cooling device 6 is installed on the circulation pipeline 5 to cool the working fluid within the circulation pipeline 5. The cooling device 6 typically uses a water-cooled cooler, such as a shell-and-tube heat exchanger, which exchanges heat with the external coolant to remove heat from the working fluid and lower its temperature. Alternatively, the cooling device 6 can also use an air-cooled cooler. An air-cooled cooler uses a fan to blow air across the heat exchange fins, carrying away heat from the working fluid.

[0033] Reference Figure 1 The pH adjustment unit 7 is used to adjust the pH value of the working solution in the circulation pipeline 5. Specifically, the pH adjustment unit 7 includes a pH adjustment tank 71, a pH sensor 72, and an automatic dosing device. Multiple pH adjustment tanks 71 can be installed and connected in parallel on the circulation pipeline 5. Each pH adjustment tank 71 has an inlet 711 and an outlet 712. The inlet 711 is located near the top of the pH adjustment tank 71, and the outlet 712 is located near the bottom of the pH adjustment tank 71. Both the inlet 711 and the outlet 712 are connected to the circulation pipeline 5. The pH adjustment tank 71 is generally a cylindrical tank made of stainless steel. The pH sensor 72 is installed inside the pH adjustment tank 71 and is used to detect the pH value of the working solution. The pH sensor 72 is typically an electrochemical sensor that determines the pH value by measuring the hydrogen ion concentration in the working solution. The automatic dosing device is used to add an alkaline neutralizing agent to the pH adjustment tank 71 to maintain the pH value of the working solution within a slightly alkaline range.

[0034] Reference Figure 1 and Figure 2 Specifically, the automatic dosing device includes a storage tank 73, a delivery pipe 74, and an automatic dosing pump 75. The storage tank 73 stores the alkaline neutralizing agent and is typically made of plastic or stainless steel. The delivery pipe 74 connects to both the storage tank 73 and the pH adjustment tank 71, and the automatic dosing pump 75 is installed on the delivery pipe 74. The automatic dosing pump 75 can be a peristaltic pump or a diaphragm pump, delivering the alkaline neutralizing agent to the pH adjustment tank 71. A pH sensor 72 is electrically connected to a controller, which is also electrically connected to the automatic dosing pump 75. The controller dynamically adjusts the flow rate of the automatic dosing pump 75 based on the pH value of the working solution in the pH adjustment tank 71. When the pH sensor 72 detects that the pH value of the working solution is lower than the set value, it transmits a signal to the controller, which then controls the automatic dosing pump 75 to increase the flow rate. When the pH value reaches the set value, the controller controls the automatic dosing pump 75 to decrease the flow rate, thus maintaining the pH value of the working solution within a relatively stable range.

[0035] Reference Figure 2A spiral mixing pipe 713 is fixedly installed inside the pH adjustment tank 71. The spiral mixing pipe 713 is connected to the water inlet 711, and the drug delivery pipe 74 is connected to the spiral mixing pipe 713, with the connection end of the drug delivery pipe 74 to the spiral mixing pipe 713 located near the water inlet 711. The spiral mixing pipe 713 is generally a spiral pipe made of stainless steel. Its function is to ensure that the working solution and the alkaline neutralizing agent are fully mixed before entering the pH adjustment tank 71, thereby improving the efficiency and uniformity of the neutralization reaction.

[0036] Reference Figure 2 A central tube 714 is fixedly installed inside the pH adjusting tank 71. The central tube 714 is vertically positioned with an opening at its top. The outlet 712 is located at the bottom of the pH adjusting tank 71 and communicates with the central tube 714. A percolation media layer 715 is also installed inside the pH adjusting tank 71, with the central tube 714 penetrating through it. A spiral mixing pipe 713 extends to the bottom of the percolation media layer 715. The central tube 714 is typically a cylindrical structure made of stainless steel. The percolation media layer 715 can use filter media such as quartz sand or activated carbon. Its function is to further remove trace amounts of hydrocarbon liquids and solid particles carried in the working fluid, keeping the working fluid clean, reducing wear on the compressor and pipelines, and extending the service life of the working fluid.

[0037] Reference Figure 1 A pulse generator 52 is installed on the circulation pipeline 5, located between the pH adjustment tank 71 and the cooling device 6. The pulse generator 52 can generate periodic pressure fluctuations to agitate the percolation media layer 715, preventing the media from caking and clogging, maintaining the filtration performance of the percolation media layer 715, and ensuring long-term stable operation of the system. The pulse generator 52 generally consists of a solenoid valve and a control system, generating pressure fluctuations by controlling the opening and closing of the solenoid valve.

[0038] Reference Figure 1 and Figure 2 A backflushing pipe 53 is connected to the circulation pipeline 5, located between the pulse generator 52 and the cooling device 6. The backflushing pipe 53 is connected to the pH adjustment tank 71, and the connection end between the backflushing pipe 53 and the pH adjustment tank 71 is located below the permeate layer 715. The function of the backflushing pipe 53 is to cooperate with the periodic operation of the pulse generator 52 to periodically backflush the permeate layer 715, remove trapped impurities and deposits, restore the filtration capacity of the permeate layer 715, extend the service life of the filter media, and reduce the frequency of maintenance.

[0039] Reference Figure 2The pH adjusting tank 71 is connected to a drain pipe 716. The end of the drain pipe 716 that connects to the pH adjusting tank 71 is located below the permeate layer 715, and a shut-off valve 717 is installed on the drain pipe 716. The drain pipe 716 is used to periodically discharge sediment and impurities from the bottom of the pH adjusting tank 71, keeping the system clean, preventing impurities from accumulating and affecting system operation, and facilitating system inspection and maintenance. The shut-off valve 717 controls the opening and closing of the drain pipe 716.

[0040] The implementation principle of a liquid ring compressor unit for sulfur-containing natural gas in this application embodiment is as follows: Sulfur-containing natural gas enters the first liquid ring compressor 2 and the second liquid ring compressor 3 through the inlet pipe 1 for compression, forming a gas-liquid mixture, which then enters the gas-liquid separator 4 for gas-liquid separation. The separated gas is discharged through the exhaust pipe 42, and the working fluid circulates through the circulation pipe 5. The cooling device 6 cools and lowers the working fluid. By setting the first liquid ring compressor 2 and the second compressor in parallel, the number of operating units can be flexibly adjusted according to actual working conditions to distribute the liquid flow, thereby effectively avoiding excessively high or low pressure inside the entire unit and ensuring the stability of the entire unit's operation. By setting a pH value adjustment unit 7 to monitor and adjust the pH value of the working fluid in real time, maintaining it in a slightly alkaline range, the acidic substances in the working fluid are neutralized, fundamentally solving the problem of acid corrosion of the working fluid. Compared with the prior art, this solution does not require frequent replacement of the working fluid, significantly reducing operating costs and wastewater treatment burden, while greatly extending the service life of key equipment such as compressors, pipelines, and cooling device 6, and improving the safety and environmental protection of the entire unit's operation.

[0041] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A liquid ring compressor unit for sulfur-containing natural gas, characterized in that, include: Inlet pipe (1) is used to transport sulfur-containing natural gas; The first liquid ring compressor (2) and the second liquid ring compressor (3) are arranged in parallel. The air inlet pipe (1) is connected to the inlet of the first liquid ring compressor (2) and the second liquid ring compressor (3) respectively, and is used to compress sulfur-containing natural gas to form a gas-liquid mixture. The gas-liquid separator (4) is connected to the outlets of the first liquid ring compressor (2) and the second liquid ring compressor (3) through the gas-liquid conveying pipe (41) and is used to separate the compressed natural gas and working fluid. The top of the gas-liquid separator (4) is provided with an exhaust pipe (42). The circulation pipeline (5) is connected to the bottom of the vapor-liquid separator (4), and the circulation pipeline (5) is connected to the first liquid ring compressor (2) and the second liquid ring compressor (3) respectively. A circulation pump (51) is installed on the circulation pipeline (5). A cooling device (6) is installed on the circulation pipeline (5) to cool the working fluid in the circulation pipeline (5); The pH adjustment unit (7) is installed on the circulation pipeline (5) and located between the cooling device (6) and the vapor-liquid separator (4) to adjust the pH value of the working fluid in the circulation pipeline (5).

2. A liquid ring compressor unit for sulfur-containing natural gas according to claim 1, characterized in that: The first liquid ring compressor (2) and the second liquid ring compressor (3) are both connected to a pressure relief pipe (8), and a pressure stabilizing valve (81) is provided on the pressure relief pipe (8).

3. A liquid ring compressor unit for sulfur-containing natural gas according to claim 1, characterized in that: A wire mesh demister (43) is provided inside the vapor-liquid separator (4) and near the top. The end of the gas-liquid conveying pipe (41) that connects to the vapor-liquid separator (4) is located below the wire mesh demister (43), and the end of the exhaust pipe (42) that connects to the vapor-liquid separator (4) is located above the wire mesh demister (43).

4. A liquid ring compressor unit for sulfur-containing natural gas according to claim 1, characterized in that: The pH adjustment unit (7) includes a pH adjustment tank (71), a pH sensor (72), and an automatic dosing device. The pH adjustment tank (71) is provided with an inlet (711) and an outlet (712), and both the inlet (711) and the outlet (712) are connected to the circulation pipeline (5). The pH sensor (72) is installed in the pH adjustment tank (71) to detect the pH value of the working solution. The automatic dosing device is used to add an alkaline neutralizing agent to the pH adjustment tank (71) to maintain the pH value of the working solution in a weakly alkaline range.

5. A liquid ring compressor unit for sulfur-containing natural gas according to claim 4, characterized in that: The automatic dosing device includes a storage tank (73), a delivery pipe (74), and an automatic dosing pump (75). The delivery pipe (74) is connected to the storage tank (73) and the pH adjustment tank (71) respectively. The automatic dosing pump (75) is installed on the delivery pipe (74). The pH sensor (72) is electrically connected to a controller, and the controller is electrically connected to the automatic dosing pump (75).

6. A liquid ring compressor unit for sulfur-containing natural gas according to claim 5, characterized in that: A spiral mixing pipe (713) is fixedly installed inside the pH adjustment tank (71). The spiral mixing pipe (713) is connected to the water inlet (711). The drug delivery pipe (74) is connected to the spiral mixing pipe (713), and the end of the drug delivery pipe (74) connected to the spiral mixing pipe (713) is close to the water inlet (711).

7. A liquid ring compressor unit for sulfur-containing natural gas according to claim 6, characterized in that: A central tube (714) is fixedly installed inside the pH adjustment tank (71). The top of the central tube (714) is open. The outlet (712) is located at the bottom of the pH adjustment tank (71) and communicates with the central tube (714). A permeate layer (715) is also installed inside the pH adjustment tank (71), and the central tube (714) penetrates the permeate layer (715). The spiral mixing pipe (713) extends to the bottom of the permeate layer (715).

8. A liquid ring compressor unit for sulfur-containing natural gas according to claim 7, characterized in that: A pulse generator (52) is installed on the circulation pipeline (5) and between the pH adjustment tank (71) and the cooling device (6).

9. A liquid ring compressor unit for sulfur-containing natural gas according to claim 8, characterized in that: A backflush pipe (53) is also connected to the circulation pipeline (5) and located between the pulse generator (52) and the cooling device (6). The backflush pipe (53) is connected to the pH adjustment tank (71), and the connection end of the backflush pipe (53) and the pH adjustment tank (71) is located below the permeate layer (715).

10. A liquid ring compressor unit for sulfur-containing natural gas according to claim 9, characterized in that: The pH adjustment tank (71) is connected to a drain pipe (716), and the end of the drain pipe (716) connected to the pH adjustment tank (71) is located below the permeate layer (715), and a shut-off valve (717) is provided on the drain pipe (716).

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