Natural gas screw compressor system
By setting up a multi-stage separator and control valve in the screw compressor system, the problems of dust and condensate during natural gas boosting are solved, and the stable operation and long life of the equipment are achieved.
Patent Information
- Application Number
- CN202422560149.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-22
- Publication Date
- 2025-08-01
- Estimated Expiration
- 2034-10-22
AI Technical Summary
In the prior art, when screw compressors supercharge natural gas, they lack effective inlet and outlet gas treatment and control means, resulting in shortening of operational instability and service life.
Filters and gas-liquid separators are installed on the intake pipe of the screw compressor, and oil and gas-liquid separators are installed on the exhaust pipes, and safety valves, liquid level sensors and pressure regulating valves are equipped to achieve multi-stage separation and control.
It effectively removes dust and condensate from the gas, prevents rust and scalds, ensures the operating stability of the compressor and the service life of the equipment, and improves the stability and safety of the pipeline pressure.
Smart Images
Figure CN223177737U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of natural gas compression, and more specifically, relates to a natural gas screw compressor system. Background Technique
[0002] Screw compressors, also known as spiral compressors, include screw air compressors and screw process compressors (such as vinyl chloride compressors). Screw machines are positive displacement twin-screw oil-injected compressors, generally of box-type skid-mounted structure. Screw compressors are divided into single-screw compressors and double-screw compressors. It wasn't until 1934 that the Royal Institute of Technology in Sweden laid the foundation for the SRM technology of screw compressors and began their industrial application, achieving rapid development.
[0003] Currently, the collection, production increase, pressurization, and transportation methods of natural gas wells are to reduce the wellhead back pressure of natural gas through a booster compressor and then transport the pressurized natural gas to the pipeline network to achieve the purpose of increasing production. With the increasingly widespread application of screw compressor systems in industrial production, screw compressors are usually used in the prior art to pressurize natural gas. Effective treatment and control of the inlet and outlet gas of screw compressors are of great significance for ensuring the operation stability, safety, and service life of the compressor system and the entire compressor. Summary of the Utility Model
[0004] The purpose of the utility model is to provide a natural gas screw compressor system, which can effectively ensure the operation stability, safety, and service life of the screw compressor by optimizing the design of the inlet and exhaust pipelines of the natural gas screw compressor.
[0005] To achieve the above purpose, the technical solution provided by the utility model is as follows:
[0006] The utility model provides a natural gas screw compressor system, including a screw main engine. A filter and a first gas-liquid separator are sequentially arranged on the intake pipeline of the screw main engine. The filter and the first gas-liquid separator are used to filter and separate gas and liquid from the natural gas intake respectively.
[0007] An oil-gas separator, a post-cooler, and a second gas-liquid separator are sequentially arranged on the oil-gas mixed discharge pipeline of the screw main engine. The oil-gas separator is used to separate oil and gas from the oil-gas mixture discharged by the screw main engine. The post-cooler and the second gas-liquid separator are respectively used to cool down and separate gas and liquid from the high-pressure gas separated by the oil-gas separator.
[0008] Furthermore, safety valves are arranged on the first gas-liquid separator, the oil-gas separator, and the second gas-liquid separator. The outlet of the safety valve is connected to the evacuation pipeline.
[0009] Furthermore, level sensors are configured in the first gas-liquid separator, the second gas-liquid separator and the oil-gas separator, and solenoid valves are provided on their drain pipes, and the solenoid valves are in interlocking control with the corresponding level sensors.
[0010] Furthermore, the filter and the first gas-liquid separator are of an integral structure or a split structure; and / or demisting nets are provided in both the first gas-liquid separator and the second gas-liquid separator.
[0011] Furthermore, a demisting net and an oil separation core are provided in the oil-gas separator, the demisting net is located below the oil separation core, and the oil-gas mixture inlet of the oil-gas separator is located below the demisting net;
[0012] More preferably, the oil separation core includes a first oil separation core and a second oil separation core which are sleeved with each other.
[0013] Furthermore, an oil heater is provided on the oil-gas separator, a three-way temperature control valve is provided on the oil drain pipe of the oil-gas separator, one output port of the three-way temperature control valve is directly connected to the lubricating oil inlet of the screw main engine, and the other output port is connected to the lubricating oil inlet of the screw main engine through an oil cooler.
[0014] Furthermore, the air outlet pipe of the aftercooler is connected to the evacuation pipe through an automatic drain pipe, and a solenoid valve is provided on the automatic drain pipe, and the solenoid valve is in interlocking control with the pressure sensor on the exhaust pipe network.
[0015] Furthermore, a minimum pressure valve is provided on the exhaust pipe of the second gas-liquid separator, and the exhaust pipe is connected to the air inlet pipe of the system through a self-operated pressure regulating valve and a circulation pipe.
[0016] Adopting the technical solution provided by the present utility model, compared with the prior art, the following beneficial effects can be obtained:
[0017] (1) The present utility model provides a natural gas screw compressor system. A filter and a first gas-liquid separator are successively provided on the air inlet pipe of the screw main engine. The filter can effectively separate the dust particles in the gas, and then the first gas-liquid separator separates the condensed water in the natural gas, so as to avoid the influence of the dust particles and condensed water in the gas on the compression performance and service life of the screw main engine; at the same time, an oil-gas separator, an aftercooler and a second gas-liquid separator are successively provided on the oil-gas mixture discharge pipe of the screw main engine, so as to successively carry out oil-gas separation, cooling and temperature reduction, and gas-liquid separation on the oil-gas mixture discharged from the screw compressor, prevent scalding or corrosion of the backend pipe network, and further contribute to ensuring the normal use of the terminal working condition and the service life of the whole set of equipment.
[0018] (2) In the present utility model, triple protection for the pipeline network pressure is carried out on the high-pressure gas compressed by the screw compressor: safety valves are provided on both the oil-gas separator and the gas-liquid separator. The outlet pipeline of the aftercooler is connected to the evacuation pipeline through an automatic discharge pipeline, and the exhaust pipeline of the second gas-liquid separator is connected to the inlet pipeline of the system through a self-acting pressure regulating valve and a circulation pipeline, thereby effectively ensuring the stability of the pipeline network pressure and the safety of the compressor unit. Brief Description of the Drawings
[0019] Figure 1 It is a schematic structural diagram of the natural gas screw compressor system according to an embodiment of the present utility model;
[0020] In the figure: 1, screw main engine; 2, metal braided hose; 301, first gas-liquid separator; 3011, first mist eliminator; 302, second gas-liquid separator; 4, filter; 5, safety valve; 6, check valve; 7, oil-gas separator; 701, oil separation core; 702, second mist eliminator; 8, aftercooler; 9, self-acting pressure regulating valve; 10, manual ball valve; 11, air source dual / triple unit; 12, minimum pressure valve; 13, oil heater; 14, three-way temperature control valve; 15, oil cooler; 16, auxiliary oil pump; 17, oil filter; 18, automatic discharge pipeline. Detailed Embodiment
[0021] To further understand the content of the present utility model, the present utility model will be described in detail below in conjunction with the drawings and embodiments.
[0022] The structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention. Therefore, they do not have technical essence. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope that the technical content disclosed by the present utility model can cover. At the same time, the terms such as "upper", "lower", "left", "right", "middle", etc. cited in this specification are only for the convenience of description and are not used to limit the scope of implementation. The change or adjustment of their relative relationship, without substantial change in the technical content, should also be regarded as the scope that the present invention can implement.
[0023] In addition, the terms "installed", "set", "provided with", "connected" referred to in this application should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or there is internal communication between two devices, components or parts. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0024] As Figure 1 shown, an embodiment of the present utility model provides a natural gas screw compressor system, including a screw main engine 1. A filter 4 and a first gas-liquid separator 301 are successively arranged on the intake pipeline of the screw main engine 1. A large amount of dust impurity particles and condensed water often accompany the natural gas intake gas. The presence of dust impurity particles will greatly reduce the compression performance and service life of the main engine, and the presence of condensed water will cause corrosion of the backend pipe network, the main engine cavity, etc., greatly reducing the service life of the whole set of equipment. At the same time, the water content of the compressed gas will also affect the use of the terminal working conditions. Therefore, through the settings of the filter 4 and the first gas-liquid separator 301 in the embodiment of the present utility model, the natural gas intake can be filtered and gas-liquid separated respectively, which is beneficial to ensuring the service life of the whole system.
[0025] Meanwhile, an oil-gas separator 7, a post-cooler 8 and a second gas-liquid separator 302 are successively arranged on the oil-gas mixed discharge pipeline of the screw main engine 1 in the embodiment of the present utility model. The oil-gas separator 7 is used for separating oil and gas from the oil-gas mixture discharged from the screw main engine 1. After the natural gas is compressed by the screw main engine to high-pressure gas, the exhaust temperature will rise to a high temperature, which is easy to scald the pipe network and affect subsequent normal use. Therefore, in this embodiment, through the setting of the post-cooler 8, the high-pressure gas separated by the oil-gas separator 7 is cooled down to normal temperature. However, condensed water will appear during the cooling process. Therefore, a second gas-liquid separator 302 is further arranged on the exhaust pipeline of the post-cooler 8 to perform gas-liquid separation treatment again.
[0026] It should be noted that the above-mentioned filter 4, oil-gas separator 7 and gas-liquid separator can directly adopt existing filtering devices, oil-gas separation devices and gas-liquid separation devices. For example, in some embodiments, the filter 4 is preferably of a detachable filter element structure and is equipped with a differential pressure sensor for effectively monitoring the filter element accuracy. A first mist-catching net 3011 is arranged in both the first gas-liquid separator 301 and the second gas-liquid separator 302, and the condensed water in the gas is captured by the first mist-catching net 3011. A second mist-catching net 702 and an oil separation core 701 are arranged in the oil-gas separator 7. The second mist-catching net is located below the oil separation core, and the oil-gas mixed inlet of the oil-gas separator 7 is located below the second mist-catching net; in order to further improve the separation effect, the oil separation core 701 includes a first oil separation core and a second oil separation core which are sleeved with each other. Among them, the gas separated by the oil-liquid separation enters the post-cooler 8 for cooling down, and the lubricating oil is recycled to the screw compressor for repeated use. In addition, the filter 4 and the first gas-liquid separator 301 can also directly adopt an integrated structure, that is, a filter element and a mist-catching net are arranged in it at the same time to simultaneously realize the filtering and water-gas separation treatment of the natural gas intake.
[0027] Furthermore, heat tracing bands are provided on the first gas-liquid separator 301, the second gas-liquid separator 302 and the sewage discharge pipeline of the system, so as to ensure that the pipeline body will not freeze and crack in the cold winter climate environment. Combined with Figure 1 , metal braided hoses 2 are also provided on the intake pipeline and the exhaust pipeline of the screw main engine 1, so as to have axial and radial compensation functions under vibration conditions, which can replace the compensator, reduce costs and simplify the installation and assembly complexity.
[0028] As a further preferred embodiment of the natural gas screw compressor system of the present utility model, liquid level sensors are configured in the first gas-liquid separator 301, the second gas-liquid separator 302 and the oil-gas separator 7, and solenoid valves are provided on their drain pipes. The solenoid valves are in interlock control with the corresponding liquid level sensors, so that real-time liquid level monitoring can be carried out through the liquid level sensors and fed back to the control system (such as PLC). When the liquid level reaches the discharge position, the solenoid valves are controlled to open automatically, so that the rapid discharge of water / oil can be realized, the dryness of the compressed gas can be ensured, and the service life and safety of the whole set of equipment can be effectively guaranteed. However, manual control of the discharge can also be carried out.
[0029] Furthermore, in order to ensure the safety of the intake pipeline and the exhaust pipeline, safety valves 5 are provided on the first gas-liquid separator 301, the oil-gas separator 7 and the second gas-liquid separator 302. The outlet of the safety valve 5 is connected to the evacuation pipeline. More preferably, a pressure sensor and a temperature sensor are provided on the intake pipeline, and a check valve 6 is provided on the intake port pipeline of the screw main engine 1. When it is detected that the intake pressure or the intake temperature exceeds the set value, it will be transmitted to the PLC to issue an instruction to stop the machine. The setting of the check valve 6 can ensure that the lubricating oil in the compressor does not flow back to the first gas-liquid separator 301, thus causing the intake filter element to fail.
[0030] In some embodiments, the outlet pipeline of the aftercooler 8 (the pipeline between the aftercooler 8 and the second gas-liquid separator 302) is connected to the evacuation pipeline through an automatic drain pipeline 18, and a solenoid valve is provided on the automatic drain pipeline 18. The solenoid valve is in interlock control with the pressure sensor on the exhaust pipe network. Real-time pressure is transmitted through the pressure sensor, so that the automatic drain of the automatic drain pipeline 18 can be controlled by the PLC according to the pressure to ensure the stability of the exhaust pressure.
[0031] As a preferred embodiment, a minimum pressure valve 12 is provided on the exhaust pipeline of the second gas-liquid separator 302 (i.e., the exhaust pipeline of the entire system), so as to ensure that the minimum tank pressure is established in the exhaust system and reduce the operating load of the main engine. Further preferably, the above exhaust pipeline is also connected to the intake pipeline of the system (connected to the intake pipeline of the filter 4 in this embodiment) through a self-operated pressure regulating valve 9 and a circulation pipeline. The structural form of the self-operated pressure regulating valve 9 is mechanical. When the exhaust pressure exceeds the set pressure, it will automatically open to relieve pressure internally to the normal operating pressure, and the relieved pressure will flow back to the intake end of the compressor. To further ensure the pressure relief stability and safety of the exhaust pressure, a manual ball valve 10 is connected in parallel with the self-operated pressure regulating valve 9, and the manual ball valve 10 can be used to manually control the pressure relief of the exhaust.
[0032] In some embodiments, the exhaust pipeline of the second gas-liquid separator 302 is also connected to the intake port of the screw main engine 1 through a spiral valve and a gas source double / triple unit 11, so as to effectively compress the gas overflow and reduce the power of the main motor.
[0033] In order to heat the lubricating oil after oil-gas separation to ensure the stability of the lubricating oil temperature output by the oil-gas separator 7, in some embodiments, an oil heater 13 is provided on the oil-gas separator 7, so as to ensure that the oil temperature in the oil-gas separator meets the operating requirements of the screw compressor in the cold climate environment in winter.
[0034] As a further improvement of this embodiment, a three-way temperature control valve 14 is provided on the oil discharge pipeline of the oil-gas separator 7. One output port of the three-way temperature control valve 14 is directly connected to the lubricating oil inlet of the screw main engine 1, and the other output port is connected to the lubricating oil inlet of the screw main engine 1 through an oil cooler 15. As the screw compressor main engine continues to operate, the lubricating oil temperature will gradually increase. Therefore, by combining the use of the oil cooler 15 and the temperature control valve, the lubricating oil can be cooled as needed, so that the lubricating oil temperature remains constant, which is beneficial to strengthening the lubrication effect of the screw main engine, reducing friction, and extending the operation cycle of the screw main engine. Specifically, a temperature sensor can be set in the screw compressor to monitor the temperature of the lubricating oil in real time. When the temperature is too high, the three-way temperature control valve is controlled to start through the control system, so that the lubricating oil is cooled through the oil cooler.
[0035] Since the natural gas intake pressure range of the screw compressor fluctuates greatly, different intake pressures will result in different compression ratios of the compressor, and the pressure difference inside the screw main engine cavity will be too large, which will further lead to the phenomenon of oil shortage lubrication. Therefore, in this embodiment, it is further preferably to set an auxiliary oil pump 16 at the lubricating oil discharge port of the oil-gas separator to boost the lubricating oil entering the screw compressor, ensuring that there is sufficient injection oil pressure and flow at the inlet of the screw machine. Before the lubricating oil separated by the oil separator enters the screw main engine, it is further filtered by an oil filter 17.
[0036] The above has schematically described the present invention and its implementation manners. This description is not restrictive, and only one of the implementation manners of the present invention is shown in the drawings. The actual structure is not limited thereto. Therefore, if those of ordinary skill in the art are inspired by it and design similar structural manners and embodiments without creative efforts without departing from the gist of the present invention, they shall fall within the protection scope of the present invention.
Claims
1. A natural gas screw compressor system, comprising a screw main engine (1), characterized in that, A filter (4) and a first gas-liquid separator (301) are successively provided on the air inlet pipeline of the screw main engine (1). The filter (4) and the first gas-liquid separator (301) are used to filter and separate gas and liquid from the natural gas inlet respectively; An oil-gas separator (7), a post-cooler (8) and a second gas-liquid separator (302) are successively provided on the oil-gas mixed discharge pipeline of the screw main engine (1). The oil-gas separator (7) is used to separate oil and gas from the oil-gas mixture discharged from the screw main engine (1). The post-cooler (8) and the second gas-liquid separator (302) are respectively used to cool down and separate gas and liquid from the high-pressure gas separated by the oil-gas separator (7).
2. The natural gas screw compressor system according to claim 1, wherein, Safety valves (5) are provided on the first gas-liquid separator (301), the oil-gas separator (7) and the second gas-liquid separator (302). The air outlet of the safety valve (5) is connected to the exhaust pipeline.
3. The natural gas screw compressor system according to claim 2, wherein, Level sensors are configured in the first gas-liquid separator (301), the second gas-liquid separator (302) and the oil-gas separator (7). Solenoid valves are provided on their drain pipes. The solenoid valves are in interlock control with the corresponding level sensors.
4. The natural gas screw compressor system according to any one of claims 1-3, characterized in that, The filter (4) and the first gas-liquid separator (301) are of an integral structure or a split structure; and / or mist eliminators are provided in the first gas-liquid separator (301) and the second gas-liquid separator (302).
5. The natural gas screw compressor system according to any one of claims 1-3, characterized in that A mist eliminator and an oil separation core are provided in the oil-gas separator (7). The mist eliminator is located below the oil separation core, and the oil-gas mixed inlet of the oil-gas separator (7) is located below the mist eliminator; the oil separation core includes a first oil separation core and a second oil separation core which are sleeved with each other.
6. The natural gas screw compressor system according to claim 5, wherein, An oil heater (13) is provided on the oil-gas separator (7). A three-way temperature control valve (14) is provided on the oil discharge pipeline of the oil-gas separator (7). One of the output ports of the three-way temperature control valve (14) is directly connected to the lubricating oil inlet of the screw main engine (1), and the other output port is connected to the lubricating oil inlet of the screw main engine (1) through an oil cooler (15).
7. The natural gas screw compressor system according to any one of claims 1-3, characterized in that, The air outlet pipeline of the post-cooler (8) is connected to the exhaust pipeline through an automatic discharge pipeline (18), and a solenoid valve is provided on the automatic discharge pipeline (18). The solenoid valve is in interlock control with the pressure sensor on the exhaust pipe network.
8. The natural gas screw compressor system according to claim 7, characterized in that, A minimum pressure valve (12) is provided on the exhaust pipeline of the second gas-liquid separator (302), and the exhaust pipeline is connected to the air inlet pipeline of the system through a self-operated pressure regulating valve (9) and a circulation pipeline.