Screw machine pressurization system for combustible gas recovery

Abstract

The utility model discloses a screw machine pressurization system for combustible gas recovery, which belongs to the technical field of crude oil gas recovery and comprises a surge tank, and the top of the surge tank is communicated with the top of an oil tank through a gas inlet pipe; one end of the communicating pipe is communicated with the top of the surge tank; an inlet of the screw compressor is communicated with the other end of the communicating pipe, and an outlet of the screw compressor is suitable for being communicated with a low-pressure user pipe network; at least one end of the communicating pipe is provided with a first fixing part, an inlet of the screw compressor is provided with a second fixing part, and / or the top of the surge tank is provided with a second fixing part, and the first fixing part and the second fixing part are matched to connect the communicating pipe with the surge tank and / or the screw compressor. According to the pressurization system of the screw machine, gas mixed with volatile petroleum in the oil tank can be pressurized and used for a low-pressure user pipe network, the gas mixed with the volatile petroleum is prevented from being directly emptied to a torch, efficient utilization of crude oil is achieved, and meanwhile energy conservation and emission reduction are achieved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to crude oil gas recovery technical field, and specifically relates to the screw rod machine pressurization system for combustible gas recovery. BACKGROUND

[0002] In the related art, crude oil is stored in a crude oil tank, and the oil gas ratio in the crude oil tank is affected when the crude oil is discharged and filled. In order to ensure that the gas pressure in the crude oil tank is stable within a certain range, a control valve is usually used for venting to discharge the gas mixed with volatile crude oil in the crude oil tank to a flare, which results in low utilization rate of the crude oil and difficulty in ensuring the cleanliness of the discharge. SUMMARY

[0003] The utility model discloses at least one of the technical problems in the prior art. To this end, one purpose of the utility model is to provide a screw rod machine pressurization system for combustible gas recovery.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0005] The utility model provides a screw rod machine pressurization system for combustible gas recovery, which comprises: a pressure stabilizing tank, the top of the pressure stabilizing tank is communicated with the top of an oil tank through a gas inlet pipe, and the gas in the oil tank enters the pressure stabilizing tank through the gas inlet pipe; a communication pipe, one end of the communication pipe is communicated with the top of the pressure stabilizing tank; a screw rod compressor, the inlet of the screw rod compressor is communicated with the other end of the communication pipe, and the outlet of the screw rod compressor is adapted to be communicated with a low-pressure user pipe network; wherein at least one end of the communication pipe is provided with a first fixing part, the inlet of the screw rod compressor is provided with a second fixing part, and / or the top of the pressure stabilizing tank is provided with a second fixing part, and the first fixing part and the second fixing part are matched to connect the communication pipe with the pressure stabilizing tank and / or the screw rod compressor.

[0006] According to the screw rod machine pressurization system for combustible gas recovery of the utility model, the screw rod machine pressurization system can pressurize the gas mixed with volatile oil in the oil tank and be used for the low-pressure user pipe network, avoid discharging the gas mixed with volatile oil directly to the flare, realize efficient utilization of the crude oil, and realize energy saving and emission reduction. In addition, the screw rod machine pressurization system can be quickly assembled, the construction time of the screw rod machine pressurization system is reduced, and the construction efficiency of the screw rod machine pressurization system is improved.

[0007] Further, it further comprises: an oil gas separator, which is arranged between the screw rod compressor and the low-pressure user pipe network, and is adapted to communicate the screw rod compressor with the low-pressure user pipe network.

[0008] Further, the air cooler is further arranged between the oil-gas separator and the low-pressure user pipe network.

[0009] Further, the separation tank is further arranged between the air cooler and the low-pressure user pipe network.

[0010] Further, the screw compressor is arranged below the pressure stabilizing tank, one end of the communication pipe is connected to the pressure stabilizing tank through a fastener, and the other end of the communication pipe is provided with a first fixing part.

[0011] Further, the other end of the communication pipe is rotatably sleeved with a connecting pipe, an inner circumferential wall of the connecting pipe is provided with a first thread, the connecting pipe is configured as the first fixing part, an inlet of the screw compressor is provided with a butt joint pipe, an outer circumferential wall of the butt joint pipe is provided with a second thread matched with the first thread, and the butt joint pipe is configured as the second fixing part.

[0012] Further, a free end of the butt joint pipe is adapted to abut against the other end of the communication pipe, an outer circumferential wall of the communication pipe is provided with a first limiting circular truncated cone, one end of the connecting pipe is provided with a second limiting circular truncated cone adapted to abut against the first limiting circular truncated cone in an axial direction, and an outer circumferential wall of the butt joint pipe is provided with an abutting circular truncated cone adapted to abut against a free end of the connecting pipe.

[0013] Further, the free end of the butt joint pipe and / or the other end of the communication pipe is provided with a first sealing rubber.

[0014] Further, a second sealing rubber is arranged between the first limiting circular truncated cone and the second limiting circular truncated cone, and a third sealing rubber is arranged between the abutting circular truncated cone and the free end of the butt joint pipe.

[0015] Further, the blowdown assembly is selectively communicated with the bottom of the pressure stabilizing tank, and the blowdown assembly is adapted to be communicated with the pressure stabilizing tank when the amount of waste oil at the bottom of the pressure stabilizing tank exceeds a threshold value, so as to discharge the waste oil at the bottom of the pressure stabilizing tank.

[0016] Other advantages, objects, and features of the present application will be apparent from the following detailed description of the application and will be understood by those skilled in the art. The objects and other advantages of the present application will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings. BRIEF DESCRIPTION OF DRAWINGS

[0017] For the purpose, technical scheme and advantages of the utility model are more clearly, the utility model provides following attached drawing to explain:

[0018] Fig. 1 It is the front view of the screw rod machine pressure boosting system of the utility model;

[0019] Fig. 2 It is the rear view of the screw rod machine pressure boosting system of the utility model;

[0020] Fig. 3 It is the section view of the communication pipe and the butt joint pipe cooperation of the utility model.

[0021] The marks in the drawing are as follows:

[0022] 1, screw rod machine pressure boosting system;

[0023] 10, pressure stabilizing tank;

[0024] 20, communication pipe;21, connecting pipe;211, second limit circular table;22, first limit circular table;

[0025] 30, screw rod compressor;31, butt joint pipe;311, stop circular table;

[0026] 40, oil-gas separator;50, air cooler;60, separation tank;70, inlet pipe;80, blowdown assembly;

[0027] 91, first sealing rubber;92, second sealing rubber;93, third sealing rubber. DETAILED DESCRIPTION

[0028] For the purpose, technical scheme and advantages of the utility model are more clearly, the utility model provides following attached drawing to explain:

[0029] In the following description, a large number of specific details are set forth in order to provide a thorough understanding of the utility model. However, it will be apparent to one of ordinary skill in the art that the utility model can be practiced without these specific details. In other instances, well-known structures, circuits, materials or methods have not been described in detail in order to avoid obscuring the utility model.

[0030] Reference throughout this specification to "one embodiment", "an embodiment", "one example", or "an example", means that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in at least one embodiment of the application. Thus, appearances of the phrases "in one embodiment", "in an embodiment", "in one example", or "in an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics can be combined in any suitable

[0031] In the description of the present application, it is to be understood that the orientations or positional relationships indicated by the terms "front", "back", "left", "right", "up", "down", "vertical", "horizontal", "high", "low", "inner", "outer" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the scope of protection of the present application.

[0032] Embodiment one:

[0033] As shown in Figs. 1-3 The utility model provides a screw machine pressurization system 1 for combustible gas recovery, it includes: pressure tank 10, communication pipe 20 and screw compressor 30, the top of pressure tank 10 is communicated with the top of oil tank through air inlet pipe 70, and the gas in oil tank enters pressure tank 10 through air inlet pipe 70, one end of communication pipe 20 is communicated with the top of pressure tank 10, and the inlet of screw compressor 30 is communicated with the other end of communication pipe 20, and the outlet of screw compressor 30 is adapted to be communicated with low pressure user pipe network, wherein at least one end of communication pipe 20 is provided with first fixed part, the inlet of screw compressor 30 is provided with second fixed part, and / or the top of pressure tank 10 is provided with second fixed part, and the first fixed part is matched with the second fixed part to connect communication pipe 20 with pressure tank 10 and / or screw compressor 30.

[0034] In some embodiments, the surge tank 10 is located at the front end of the screw machine booster system 1, and the surge tank 10 is connected to the top of the oil tank through the top gas inlet pipe 70, so that the gas in the oil tank can enter the surge tank 10 through the gas inlet pipe 70, and the surge tank 10 can stabilize the gas pressure input from the oil tank, and ensure that the gas pressure in the subsequent processing process is maintained within a controllable range. One end of the communication pipe 20 is connected to the top of the surge tank 10, and the other end of the communication pipe 20 is connected to the inlet of the screw compressor 30. The communication pipe 20 not only serves as a gas transmission channel, but also has a first fixed part at least at one end of the communication pipe 20. The screw compressor 30 is adapted to receive gas from the communication pipe 20 and output the compressed gas to the low-pressure user pipe network. The inlet of the screw compressor 30 is provided with a second fixed part, and / or the top of the surge tank 10 is provided with a second fixed part. The first fixed part and the second fixed part cooperate with each other to firmly connect the communication pipe 20 to the surge tank 10 and / or the screw compressor 30, ensuring the rapid assembly of the entire screw machine booster system 1 and ensuring the stability of the connection of the screw machine booster system 1.

[0035] It can be understood that the oil tank stores crude oil and the like, and the space at the top of the oil tank is mixed with volatile flammable oil gas. The flammable gas (mixed gas) can enter the surge tank 10 through the gas inlet pipe 70 and be filtered and separated in the surge tank 10 (the flammable gas may be separated into mixed gas and crude oil after entering the surge tank 10, the crude oil is at the bottom of the surge tank 10, and the mixed gas is at the top of the surge tank 10, and the mixed gas also contains volatile crude oil). The mixed gas enters the screw compressor 30 through the communication pipe 20 and enters the low-pressure user pipe network after being pressurized by the screw compressor 30. It is worth mentioning that the mixed gas is pressurized to 0.3 MPa by the screw compressor 30 to meet the requirements of being delivered to the low-pressure user pipe network.

[0036] It is worth mentioning that at least one end of the communication pipe 20 is provided with a first fixed part, the inlet of the screw compressor 30 is provided with a second fixed part, and / or the top of the surge tank 10 is provided with a second fixed part. The first fixed part and the second fixed part cooperate to connect the communication pipe 20 to the surge tank 10 and / or the screw compressor 30.

[0037] The one end of the communication pipe 20 can be provided with a first fixing part, the inlet of the screw compressor 30 is provided with a second fixing part, and the first fixing part is matched with the second fixing part to quickly connect the communication pipe 20 with the screw compressor 30; or the one end of the communication pipe 20 is provided with a first fixing part, the top of the pressure stabilizing tank 10 is provided with a second fixing part, and the first fixing part is matched with the second fixing part to quickly connect the communication pipe 20 with the pressure stabilizing tank 10; or both ends of the communication pipe 20 are provided with first fixing parts, the inlet of the screw compressor 30 and the top of the pressure stabilizing tank 10 are provided with second fixing parts, and the first fixing parts are matched with the second fixing parts to quickly connect the communication pipe 20 with the screw compressor 30 and the pressure stabilizing tank 10.

[0038] According to the screw machine supercharging system 1 for combustible gas recovery, the screw machine supercharging system 1 can pressurize the mixed volatile oil gas in the oil tank and be used for a low-pressure user pipe network, avoids directly venting the mixed volatile oil gas to a flare, realizes efficient utilization of crude oil, simultaneously realizes energy saving and emission reduction, and the screw machine supercharging system 1 can be quickly assembled, construction time of the screw machine supercharging system 1 is reduced, and construction efficiency of the screw machine supercharging system 1 is improved.

[0039] Embodiment two:

[0040] In this embodiment, on the basis of the embodiment one, the screw machine supercharging system 1 further comprises an oil-gas separator 40, the oil-gas separator 40 is arranged between the screw compressor 30 and the low-pressure user pipe network, and the oil-gas separator 40 is adapted to communicate the screw compressor 30 with the low-pressure user pipe network.

[0041] It can be understood that the gas compressed by the screw compressor 30 first passes through the oil-gas separator 40 before entering the low-pressure user pipe network, the main task of the oil-gas separator 40 is to remove the entrained oil and other liquid impurities (because the gas is compressed and the temperature is increased, the lubricating oil or other liquids may be separated and mixed into the gas flow, if not separated, the liquids may damage the subsequent equipment or pollute the transported gas) from the compressed gas, the gas treated by the oil-gas separator 40 is more pure, the content of harmful substances is reduced, and thus the gas can be safely transported to the low-pressure user pipe network for use.

[0042] According to some embodiments of the utility model, the screw machine supercharging system 1 further comprises an air cooler 50, the air cooler 50 is arranged between the oil-gas separator 40 and the low-pressure user pipe network, and the air cooler 50 is adapted to communicate the oil-gas separator 40 with the low-pressure user pipe network.

[0043] It can be understood that the gas treated by the oil-gas separator 40 is first cooled by the air cooler 50 before entering the low-pressure user pipe network. The main task of the air cooler 50 is to reduce the temperature of the high-temperature gas from the oil-gas separator 40 (the compression process can cause the temperature of the gas to rise significantly, and the excessively high temperature can cause adverse effects on the downstream equipment or does not meet the requirements of some process flows). The temperature of the cooled gas is more moderate, which helps to maintain the stability of the pressure and flow of the gas in the subsequent conveying process and ensures that the gas can be conveyed to the low-pressure user pipe network under the expected conditions.

[0044] According to some embodiments of the present application, the screw machine supercharging system 1 further comprises a separation tank 60, which is arranged between the air cooler 50 and the low-pressure user pipe network. The separation tank 60 is adapted to communicate the air cooler 50 and the low-pressure user pipe network.

[0045] It can be understood that the gas cooled by the air cooler 50 is first further treated by the separation tank 60 before entering the low-pressure user pipe network. The main task of the separation tank 60 is to further separate the liquid substances or small particles that may remain in the gas (even after the treatment of the oil-gas separator 40 and the air cooler 50, there may still be a small amount of liquid droplets or condensate in the gas, which can cause damage to the downstream equipment or pollute the conveyed gas if not removed). The separation tank 60 effectively separates the impurities in the gas by gravity settling, centrifugal force or other physical methods, ensuring that the gas finally conveyed to the low-pressure user pipe network is as pure as possible.

[0046] Embodiment three:

[0047] In this embodiment, the screw compressor 30 is arranged below the pressure stabilizing tank 10. One end of the communication pipe 20 is connected to the pressure stabilizing tank 10 by a fastener, and the other end of the communication pipe 20 is provided with a first fixing part. The inlet of the screw compressor 30 is provided with a second fixing part.

[0048] In some embodiments, the screw compressor 30 is placed below the pressure stabilizing tank 10. This vertical layout not only saves installation space, but also simplifies the overall design of the screw machine supercharging system 1. At the same time, the above arrangement also helps to reduce the resistance of the gas transmission process by using gravity.

[0049] The one end of the communication pipe 20 is firmly connected to the pressure stabilizing tank 10 by a fastener, which ensures good sealing performance even in a high-pressure environment, preventing gas leakage. The connection method using the first fixing part and the second fixing part makes the connection between the communication pipe 20 and the screw compressor 30 convenient and reliable, facilitating installation and maintenance, and can adapt to different site conditions.

[0050] Thus, the stable connection mode reduces the risk of gas leakage, improves the safety performance of the entire screw compressor supercharging system 1, is particularly important when handling flammable and explosive gas, and moreover, the standardized fixed part design and the application of fasteners ensure the stability of the screw compressor supercharging system 1 under long-time operation, reduce the failure rate caused by loose or failed connection, of course, the modular design makes installation more convenient, and also facilitates later maintenance and maintenance work, reduces downtime, at the same time, the compact space layout reduces the floor area, reduces the installation cost, and the reliable connection design reduces the potential maintenance cost, improves the economy.

[0051] According to some embodiments of the present application, the other end of the communication pipe 20 is rotatably sleeved with a connecting pipe 21, the inner circumferential wall of the connecting pipe 21 is provided with a first thread, the connecting pipe 21 is configured as a first fixed part, and the inlet of the screw compressor 30 is provided with a butt joint pipe 31, the outer circumferential wall of the butt joint pipe 31 is provided with a second thread matched with the first thread, and the butt joint pipe 31 is configured as a second fixed part.

[0052] In some embodiments, the connecting pipe 21 can be rotated relative to the communication pipe 20 to allow adjustment of the angle during on-site installation, thereby adapting to different installation environments and space limitations, and the connecting pipe 21 (first fixed part) and the butt joint pipe 31 (second fixed part) are tightly connected by means of threaded cooperation, ensuring the strength and sealing performance of the connection between the connecting pipe 21 and the screw compressor 30, and moreover, the threaded connection facilitates installation and disassembly, simplifies maintenance and repair work, and at the same time ensures the reliability of the connection.

[0053] According to some embodiments of the present application, the free end of the butt joint pipe 31 is adapted to abut against the other end of the communication pipe 20, the outer circumferential wall of the communication pipe 20 is provided with a first limiting circular table 22, one end of the connecting pipe 21 is provided with a second limiting circular table 211 adapted to abut against the first limiting circular table 22 in the axial direction, and the outer circumferential wall of the butt joint pipe 31 is provided with an abutting circular table 311 adapted to abut against the free end of the connecting pipe 21.

[0054] In some embodiments, the free end of the butt joint pipe 31 abuts against the other end of the communication pipe 20, ensuring that the butt joint pipe 31 and the communication pipe 20 are aligned and tightly fitted in the axial direction, avoiding gas leakage, and moreover, the first limiting circular table 22 and the second limiting circular table 211 abut against each other in the axial direction, limiting the maximum rotation depth of the connecting pipe 21 relative to the communication pipe 20, preventing damage caused by excessive tightening, and of course, the abutting circular table 311 abuts against the free end of the connecting pipe 21, providing additional axial support and ensuring the stability of the entire connection structure.

[0055] It is worth mentioning that through multiple abutting points (between the connecting pipe 31 and the communication pipe 20, between the first limiting circular table 22 and the second limiting circular table 211, and between the abutting circular table 311 and the free end of the connecting pipe 21), a stable triple locking mechanism is formed, which ensures that the connection part can remain stable even in a high-pressure environment and guarantees the sealing property.

[0056] According to some embodiments of the present application, the free end of the connecting pipe 31 and / or the other end of the communication pipe 20 are provided with a first sealing rubber 91. It can be understood that the first sealing rubber 91 is located at the free end of the connecting pipe 31 and / or the other end of the communication pipe 20, and when the connecting pipe 31 and the communication pipe 20 abut, the sealing rubber is compressed and forms an effective sealing barrier. The role of the sealing rubber is to fill the possible small gaps in the connection part, ensuring that the gas will not leak from the connection.

[0057] According to some embodiments of the present application, a second sealing rubber 92 is arranged between the first limiting circular table 22 and the second limiting circular table 211, and a third sealing rubber 93 is arranged between the abutting circular table 311 and the free end of the connecting pipe 31.

[0058] It can be understood that the second sealing rubber 92 is located between the first limiting circular table 22 and the second limiting circular table 211, and plays a sealing role when the first limiting circular table 22 and the second limiting circular table 211 abut, preventing gas from leaking from the gap between the limiting structures. The third sealing rubber 93 is located between the abutting circular table 311 and the free end of the connecting pipe 31, and forms an additional sealing barrier when the abutting circular table 311 and the connecting pipe 31 are in contact, ensuring the sealing property of the connection part.

[0059] By adding sealing rubbers at key abutting points (limiting circular tables and abutting circular table 311), a multiple sealing structure is formed, greatly enhancing the sealing performance of the entire connection system, ensuring that it can maintain a good sealing state even in a high-pressure or vibration environment.

[0060] Therefore, the second sealing rubber 92 and the third sealing rubber 93 work together to provide multi-layer sealing protection, effectively preventing gas leakage and improving the overall safety and reliability of the screw machine supercharging system 1. Moreover, the second sealing rubber 92 and the third sealing rubber 93 are elastic and can automatically adjust to adapt to pressure changes, temperature fluctuations, and other environmental factors, ensuring long-term stable sealing effect.

[0061] Embodiment Four:

[0062] The screw machine supercharging system 1 further comprises a blowdown assembly 80 selectively in communication with the bottom of the surge tank 10, the blowdown assembly 80 being adapted to be in communication with the surge tank 10 when the amount of waste oil at the bottom of the surge tank 10 exceeds a threshold value, so as to discharge the waste oil at the bottom of the surge tank 10.

[0063] It can be understood that the surge tank 10 may accumulate a certain amount of waste oil during operation, which is mainly derived from liquid components carried in the gas or leakage of lubricating oil inside the equipment, etc. The blowdown assembly 80 is equipped with a monitoring device (such as a liquid level sensor) to monitor the amount of waste oil at the bottom of the surge tank 10 in real time. When the amount of waste oil reaches or exceeds a preset threshold value, the blowdown assembly 80 will start and be in communication with the surge tank 10 to discharge the excess waste oil, so as to ensure the cleanliness of the internal environment of the surge tank 10 and the normal operation of the screw machine supercharging system 1.

[0064] It is worth mentioning that the communication between the blowdown assembly 80 and the surge tank 10 is selective, i.e. it will only be opened when it is necessary to discharge waste oil, and it will remain closed in normal times to prevent gas leakage or other accidents.

[0065] Finally, it should be pointed out that the above preferred embodiments are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present application.

Claims

1. A screw machine supercharging system for combustible gas recovery, characterized by, The utility model relates to a kind of oil vapor recovery system, comprising: A surge tank, the top of the surge tank is communicated with the top of oil tank by gas inlet pipe, and the gas in the oil tank enters the surge tank through the gas inlet pipe; A communication pipe, one end of the communication pipe is communicated with the top of the surge tank; A screw compressor, the inlet of the screw compressor is communicated with the other end of the communication pipe, and the outlet of the screw compressor is adapted to be communicated with low-pressure user pipe network;Wherein At least one end of the communication pipe is provided with a first fixed part, the inlet of the screw compressor is provided with a second fixed part, and / or the top of the surge tank is provided with a second fixed part, and the first fixed part is matched with the second fixed part to connect the communication pipe with the surge tank and / or the screw compressor.

2. A screw machine supercharging system for combustible gas recovery according to claim 1, characterized in that, Further comprising: An oil-gas separator is arranged between the screw compressor and the low-pressure user pipe network, and the oil-gas separator is adapted to communicate the screw compressor with the low-pressure user pipe network.

3. A screw machine supercharging system for combustible gas recovery according to claim 2, characterized in that, Further comprising: An air cooler is arranged between the oil-gas separator and the low-pressure user pipe network, and the air cooler is adapted to communicate the oil-gas separator with the low-pressure user pipe network.

4. The screw machine supercharging system for combustible gas recovery of claim 3, wherein, Further comprising: A separation tank is arranged between the air cooler and the low-pressure user pipe network, and the separation tank is adapted to communicate the air cooler with the low-pressure user pipe network.

5. The screw machine supercharging system for combustible gas recovery of claim 1, wherein, The screw compressor is arranged below the surge tank, one end of the communication pipe is connected with the surge tank by a fastener, the other end of the communication pipe is provided with a first fixed part, and the inlet of the screw compressor is provided with a second fixed part.

6. A screw machine supercharging system for combustible gas recovery according to claim 5, characterized in that, The other end of the communication pipe is rotatably sleeved with a connecting pipe, the inner circumferential wall of the connecting pipe is provided with a first thread, the connecting pipe is configured as the first fixed part, the inlet of the screw compressor is provided with a butt joint pipe, the outer circumferential wall of the butt joint pipe is provided with a second thread matched with the first thread, and the butt joint pipe is configured as the second fixed part.

7. A screw machine supercharging system for combustible gas recovery according to claim 6, characterized in that, The free end of the butt joint pipe is adapted to abut against the other end of the communication pipe, the outer circumferential wall of the communication pipe is provided with a first limiting circular truncated cone, one end of the connecting pipe is provided with a second limiting circular truncated cone adapted to abut against the first limiting circular truncated cone in the axial direction, the outer circumferential wall of the butt joint pipe is provided with an abutting circular truncated cone adapted to abut against the free end of the connecting pipe.

8. A screw machine supercharging system for combustible gas recovery according to claim 7, characterized in that, The free end of the butt joint pipe and / or the other end of the communication pipe is provided with a first sealing rubber.

9. A screw machine supercharging system for combustible gas recovery according to claim 8, characterized in that, The second sealing rubber is arranged between the first limiting circular truncated cone and the second limiting circular truncated cone, and the third sealing rubber is arranged between the abutting circular truncated cone and the free end of the butt joint pipe.

10. The screw machine supercharging system for combustible gas recovery of claim 1, wherein, Further comprising: A blowdown assembly is selectively communicated with the bottom of the surge tank, and the blowdown assembly is adapted to be communicated with the surge tank when the amount of waste oil at the bottom of the surge tank exceeds a threshold value to discharge the waste oil at the bottom of the surge tank.

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