A dry gas seal turboexpander skid-mounted power generation system

Abstract

The application discloses a kind of dry gas seal's turbine expander pry dress power generation system, including pry dress pedestal, motor, speed reducer, expander, dry gas seal device, motor is connected with expander transmission by speed reducer;The inside of expander is provided with seal gas area and isolation gas area, dry gas seal device includes seal gas supply part, isolation gas supply part, leakage gas return part, seal gas supply part is connected with the inlet gas source of expander, seal gas supply part is connected with seal gas area;Isolation gas supply part is connected with isolation gas source, isolation gas supply part is connected with isolation gas area;The inside of expander is provided with leakage gas interface, leakage gas interface is connected with leakage gas return part, leakage gas return part is also connected with isolation gas supply part;The application forms double-stage seal by seal gas and isolation gas in expander, guarantees the sealing property of expander, simultaneously by isolation gas to seal gas is isolated, avoid seal gas leakage and contact with the bearing of rotor, effectively protect the bearing of rotor.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of expander power generation, and relates to a dry gas seal turbine expander skid-mounted power generation system. BACKGROUND

[0002] In the existing turbine expander power generation system, the turbine expander is one of the core components, and whether the turbine expander can work normally affects the normal operation of the entire expander power generation system. The existing turbine expander is provided with a single-end-face dry gas seal structure to form a single-stage seal, and the sealing property is difficult to guarantee after the expander works for a long time. Once the single-end-face dry gas seal structure leaks, the high-temperature and high-pressure sealing gas leaked from the end face will flow to the bearing of the expander rotor structure, thereby affecting the normal work of the bearing, even causing damage to the bearing, and finally causing the expander to fail. Therefore, the turbine expander in the existing expander power generation system has the defects of insufficient reliability of single-stage seal and damage to the bearing caused by sealing gas leakage.

[0003] In view of the above technical problems existing in the turbine expander in the existing expander power generation system, the present application discloses a dry gas seal turbine expander skid-mounted power generation system. SUMMARY

[0004] The present application aims to provide a dry gas seal turbine expander skid-mounted power generation system, which forms a double-stage seal inside the expander by sealing gas and isolation gas, guarantees the sealing property of the expander, and simultaneously isolates the sealing gas by the isolation gas to avoid the contact of the sealing gas with the bearing of the rotor after leakage, thereby effectively protecting the bearing of the rotor.

[0005] The present application is realized by the following technical scheme:

[0006] A dry gas seal turbine expander skid-mounted power generation system, comprising a skid-mounted base, a motor, a speed reducer, an expander and a dry gas seal device are modularly skid-mounted on the skid-mounted base, the output end of the motor is in transmission connection with the input end of the speed reducer, and the output end of the speed reducer is in transmission connection with the rotor of the expander; the inside of the expander is provided with a sealing gas area and an isolation gas area, the dry gas seal device comprises a sealing gas supply part, an isolation gas supply part and a leakage gas return part, the inlet end of the sealing gas supply part is connected with the inlet gas source of the expander, and the outlet end of the sealing gas supply part is connected with the sealing gas area; the inlet end of the isolation gas supply part is connected with the isolation gas source, and the outlet end of the isolation gas supply part is connected with the isolation gas area; the inside of the expander is provided with a leakage gas interface, the leakage gas interface is connected with the leakage gas return part, and the leakage gas return part is further connected with the isolation gas supply part through a gas return bypass.

[0007] In order to better realize the present invention, further, the sealing gas supply part includes a sealing gas inlet pipeline, a sealing gas pressure regulating pipeline, and a sealing gas supply pipeline. The inlet end of the sealing gas inlet pipeline is connected to the inlet gas source of the expander, and the outlet end of the sealing gas inlet pipeline is provided with two sealing gas pressure regulating pipelines in parallel, and the sealing gas pressure regulating pipeline is provided with a sealing gas main pressure regulating valve, a filter, and a sealing gas auxiliary pressure regulating valve in series in sequence; the outlet ends of the two sealing gas pressure regulating pipelines are both connected to the sealing gas supply pipeline, and the sealing gas supply pipeline is provided with a sealing gas stop valve, a flow meter, and a pressure gauge in series in sequence, the outlet end of the sealing gas supply pipeline is connected to the sealing gas area, and a sealing gas pressure difference transmitter is provided between the outlet end of the sealing gas inlet pipeline and the inlet end of the sealing gas supply pipeline.

[0008] In order to better realize the present invention, further, the isolation gas supply part includes an isolation gas inlet pipeline and an isolation gas supply pipeline. The inlet end of the isolation gas inlet pipeline is connected to the isolation gas source, and the outlet end of the isolation gas inlet pipeline is connected to the isolation gas supply pipeline through a orifice plate. The isolation gas inlet pipeline is sequentially connected in series with an isolation gas pressure regulating part and an isolation gas pressure reducing part.

[0009] In order to better realize the present invention, further, the isolation gas pressure regulating part includes an isolation gas main pressure regulating valve, a filter, and an isolation gas auxiliary pressure regulating valve arranged in series in sequence, and an isolation gas pressure differential transmitter is provided between the inlet end of the isolation gas main pressure regulating valve and the outlet end of the isolation gas auxiliary pressure regulating valve.

[0010] In order to better realize the present invention, further, the isolation gas pressure reduction part includes a pressure reducing pipeline and a pressure reducing bypass connected in parallel, the pressure reducing pipeline is sequentially connected in series with a first ball valve, an isolation gas pressure reducing valve, and a second ball valve, and the pressure reducing bypass is provided with an isolation gas stop valve.

[0011] In order to better realize the present invention, further, an isolation gas monitoring bypass is arranged in parallel on one side of the isolation gas inlet pipeline, and an isolation gas bypass stop valve, a double stop valve group, and a pressure transmitter are arranged in series on the isolation gas detection bypass.

[0012] In order to better realize the present invention, it further includes a circulating lubrication device, the oil supply end of the circulating lubrication device is connected to the motor, reducer, and expander respectively, and the connection and disconnection between the oil supply end of the circulating lubrication device and the expander is feedback controlled according to the pressure of the isolation gas monitoring bypass.

[0013] Further, the leakage gas return part comprises a main gas return pipeline, a gas return bypass and a gas return pressure relief bypass are arranged in parallel on one side of the main gas return pipeline, the inlet end of the gas return bypass is connected with the main gas return pipeline, and the outlet end of the gas return bypass is connected with the isolated gas supply part; a first gas return stop valve, a stop three-way valve group and a second gas return stop valve are sequentially and serially arranged on the gas return bypass, and a differential pressure transmitter is arranged in parallel on one side of the stop three-way valve group; a first gas return gate valve, a bursting disc and a second gas return gate valve are sequentially and serially arranged on the gas return pressure relief bypass.

[0014] Further, the main gas return pipeline further has a chain parking bypass arranged in parallel on one side, a first parking stop valve, a stop three-way valve group and a second parking stop valve are sequentially and serially arranged on the chain parking bypass, and a flow meter is arranged in parallel on one side of the stop three-way valve group.

[0015] Compared with the prior art, the present application has the following advantages and beneficial effects:

[0016] The present application forms a primary sealing structure by supplying sealing gas to the sealing gas area inside the expander through the sealing gas supply part in the dry gas sealing device, forms a secondary sealing structure by supplying higher-pressure isolated gas to the isolated gas area inside the expander through the isolated gas supply part in the dry gas sealing device, and further ensures the sealing property of the inside of the expander; at the same time, the sealing gas area is isolated by the higher-pressure isolated gas, so that even if the sealing gas area leaks, the leaked sealing gas can be isolated and taken away from the inside of the expander by the isolated gas, thereby avoiding the contact of the sealing gas with the bearings of the rotor and effectively protecting the bearings of the rotor. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the turbine expander skid-mounted power generation system.

[0018] Figure 2 It is a top view of the turbine expander skid-mounted power generation system.

[0019] Figure 3 It is a schematic diagram of the gas path structure of the dry gas sealing device.

[0020] Wherein: 1-skid base; 2-motor; 3-speed reducer; 4-expander; 5-dry gas sealing device; 6-sealing gas supply part; 7-isolated gas supply part; 8-leakage gas return part; 9-circulating lubricating device. DETAILED DESCRIPTION

[0021] The following detailed description is exemplary and is intended to provide further explanation of the present application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0022] It is to be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, "and / or" is to be taken as specific

[0023] For the convenience of description, if "upper", "lower", "left" and "right" are mentioned in the present application, they only mean the same direction as the upper, lower, left and right directions of the drawings themselves, and do not limit the structure, but only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0024] The terms "mounting", "connecting", "connecting", "fixing" and the like in the present application should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected, it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the internal connection of two elements, or the interaction relationship between two elements, for those skilled in the art, the specific meaning of the above-mentioned terms in the present application can be understood according to the specific circumstances.

[0025] Example 1:

[0026] A dry gas seal turbine expander skid-mounted power generation system of the present embodiment, as shown in Figure 1-Figure 3 The dry gas seal turbine expander skid-mounted power generation system of the present embodiment, as shown in

[0027] The output shaft of the motor 2 is connected to the input shaft of the reducer 3 via a coupling, and the output shaft of the reducer 3 is connected to the rotating shaft of the rotor of the expander 4 via a coupling. Seal gas areas and isolation gas areas are provided in sequence inside the expander 4 corresponding to the outer sides of the rotor. Sealing gas is introduced into the seal gas area via the seal gas supply section 6 in the dry gas sealing device 5 to dry-seal the rotor. Isolation gas is introduced into the isolation gas area via the isolation gas supply section 7 in the dry gas sealing device 5, so that the pressure of the isolation gas area is higher than that of the seal gas area. The isolation gas then isolates the seal gas from the bearing portion of the rotor, and the inert isolation gas protects the bearing of the rotor. The seal gas area is connected to the leakage gas return section 8, and the start and stop of the expander 4 are feedback-controlled by monitoring the pressure difference between the leakage gas pressure of the leakage gas return section 8 and the intake air pressure of the isolation gas area.

[0028] That is, when the pressure difference between the intake pressure of the isolation gas zone and the leakage pressure of the leakage gas return part 8 is higher than the set threshold value, it indicates that the isolation gas zone can effectively isolate the sealer to protect the bearings of the rotor, and the expander 4 works normally at this time; when the pressure difference between the intake pressure of the isolation gas zone and the leakage pressure of the leakage gas return part 8 is less than or equal to the set threshold value, it indicates that the isolation gas zone cannot effectively isolate the sealer to protect the bearings of the rotor, and the expander 4 is controlled to stop working at this time.

[0029] Example 2:

[0030] The dry gas sealed turbine expander skid mounted power generation system of this embodiment is improved on the basis of embodiment 1, such as Figure 3 As shown, the sealing gas supply part 6 includes a sealing gas inlet pipeline, a sealing gas pressure regulating pipeline, and a sealing gas supply pipeline. The inlet end of the sealing gas inlet pipeline is connected to the inlet gas source of the expander 4, and the outlet end of the sealing gas inlet pipeline is provided with two sealing gas pressure regulating pipelines in parallel, and the sealing gas pressure regulating pipelines are provided with a sealing gas main pressure regulating valve, a filter, and a sealing gas auxiliary pressure regulating valve in series in sequence; the outlet ends of the two sealing gas pressure regulating pipelines are both connected to the sealing gas supply pipeline, and the sealing gas supply pipeline is provided with a sealing gas stop valve, a flow meter, and a pressure gauge in series in sequence, the outlet end of the sealing gas supply pipeline is connected to the sealing gas area, and a sealing gas pressure difference transmitter is provided between the outlet end of the sealing gas inlet pipeline and the inlet end of the sealing gas supply pipeline.

[0031] The inlet end of the sealing gas inlet pipeline is connected to the inlet gas source of expander 4 via a connecting flange. Two sealing gas pressure-regulating pipelines are installed in parallel at the outlet end of the sealing gas inlet pipeline. One sealing gas pressure-regulating pipeline has a pressure regulation range of 0.5 MPa to 3 MPa, and the other has a pressure regulation range of 3 MPa to 6.5 MPa. In other words, the two sealing gas pressure-regulating pipelines correspond to high and low pressure regulation, respectively. A main sealing gas pressure-regulating valve, a filter, and an auxiliary sealing gas pressure-regulating valve are installed in series on each of the two sealing gas pressure-regulating pipelines. The cooperation of the main and auxiliary sealing gas pressure-regulating valves achieves two-stage pressure regulation, and the filter filters out impurities in the gas.

[0032] The sealing gas supply pipeline is equipped with a sealing gas shut-off valve, flow meter, and pressure gauge in series. The sealing gas shut-off valve is normally open and is used to cut off the sealing gas supply pipeline in an emergency. The flow meter monitors the gas flow entering the sealing gas area, and the pressure gauge monitors the gas pressure entering the sealing gas area.

[0033] Furthermore, a three-stop valve group is arranged in parallel between the outlet end of the sealing gas inlet pipeline and the inlet end of the sealing gas supply pipeline to stabilize the air pressure. At the same time, a sealing gas pressure differential transmitter is arranged at both ends of the three-stop valve group to monitor the pressure difference of the sealing gas after pressure regulation.

[0034] Furthermore, a pressure gauge is provided at the outlet of the sealing gas inlet pipeline. The pressure of the sealing gas inlet pipeline is monitored by the pressure gauge. Combined with the pressure difference monitored by the sealing gas pressure differential transmitter, the gas pressure after pressure regulation can be calculated.

[0035] The rest of this embodiment is the same as that of embodiment 1, so it will not be described again.

[0036] Example 3:

[0037] The dry gas sealed turbine expander skid mounted power generation system of this embodiment is improved on the basis of embodiment 1 or 2, such as Figure 3 As shown, the isolation gas supply part 7 includes an isolation gas inlet pipeline and an isolation gas supply pipeline. The inlet end of the isolation gas inlet pipeline is connected to the isolation gas source, and the outlet end of the isolation gas inlet pipeline is connected to the isolation gas supply pipeline through a orifice plate. The isolation gas inlet pipeline is sequentially connected in series with an isolation gas pressure regulating part and an isolation gas pressure reducing part.

[0038] The inlet end of the isolation gas inlet pipeline is connected to the isolation gas source, which is nitrogen. The isolation gas pressure regulating unit is used to regulate the isolation gas pressure, and the isolation gas pressure reducing unit is used to promptly reduce the isolation gas pressure when the isolation gas pressure exceeds the standard.

[0039] Furthermore, the isolation gas pressure regulating part includes an isolation gas main pressure regulating valve, a filter, and an isolation gas auxiliary pressure regulating valve arranged in series in sequence, and an isolation gas pressure differential transmitter is provided between the inlet end of the isolation gas main pressure regulating valve and the outlet end of the isolation gas auxiliary pressure regulating valve.

[0040] The dual-pressure-regulating structure, formed by the isolation gas main and auxiliary pressure-regulating valves, allows for faster and more accurate regulation of the isolation gas pressure while simultaneously filtering out impurities. The isolation gas differential pressure transmitter is used to detect the pressure differential of the regulated isolation gas. A pressure gauge is installed on the isolation gas inlet line to measure the inlet pressure of the isolation gas. This pressure is then combined with the pressure differential detected by the isolation gas differential pressure transmitter to calculate the regulated isolation gas pressure.

[0041] Furthermore, the isolation gas pressure reduction part includes a pressure reducing pipeline and a pressure reducing bypass connected in parallel. The first ball valve, the isolation gas pressure reducing valve, and the second ball valve are sequentially arranged in series on the pressure reducing pipeline, and the isolation gas stop valve is arranged on the pressure reducing bypass.

[0042] If the calculated, regulated isolation gas pressure exceeds the specified value, it is necessary to reduce the isolation gas pressure. Open the first and second ball valves to reduce the isolation gas pressure through the isolation gas pressure reducing valve. If the calculated, regulated isolation gas pressure does not exceed the specified value, close the first and second ball valves and simultaneously open the isolation gas shutoff valve on the pressure reducing bypass. The isolation gas then enters the isolation gas supply pipeline through the pressure reducing bypass.

[0043] The rest of this embodiment is the same as that of embodiment 1 or 2, and thus will not be described in detail.

[0044] Example 4:

[0045] The dry gas sealed turbine expander skid mounted power generation system of this embodiment is improved on the basis of any one of the embodiments 1-3, such as Figure 3 As shown, an isolation gas monitoring bypass is arranged in parallel on one side of the isolation gas inlet pipeline, and an isolation gas bypass stop valve, a double stop valve group, and a pressure transmitter are arranged in series on the isolation gas detection bypass.

[0046] Furthermore, it also includes a circulating lubrication device 9, the oil supply end of the circulating lubrication device 9 is connected to the motor 2, the reducer 3, and the expander 4 respectively, and the connection and disconnection between the oil supply end of the circulating lubrication device 9 and the expander 4 is feedback controlled according to the pressure of the isolation gas monitoring bypass.

[0047] An isolation gas monitoring bypass is installed in parallel on one side of the outlet of the isolation gas inlet pipeline. The isolation gas bypass shut-off valve and double shut-off valve group on the isolation gas monitoring bypass are opened, and the air pressure at the outlet of the isolation gas inlet pipeline is detected by a pressure transmitter. The air pressure at the outlet of the isolation gas inlet pipeline is used to feedback control the opening and closing of the solenoid valve on the oil supply pipeline between the circulating lubricating device 9 and the expander 4. In other words, when the air pressure at the outlet of the isolation gas inlet pipeline is less than or equal to the set threshold, the air pressure of the isolation gas is insufficient to isolate the sealing gas. At this time, the solenoid valve on the oil supply pipeline between the circulating lubricating device 9 and the expander 4 is feedback controlled to close to prevent lubricating oil leakage. When the air pressure at the outlet of the isolation gas inlet pipeline is greater than the set threshold, the air pressure of the isolation gas is sufficient to isolate the sealing gas. At this time, the solenoid valve on the oil supply pipeline between the circulating lubricating device 9 and the expander 4 is feedback controlled to open to supply lubricating oil to the expander 4 for lubrication.

[0048] The rest of this embodiment is the same as any one of Embodiments 1-3, so they will not be described in detail.

[0049] Example 5:

[0050] The dry gas sealed turbine expander skid mounted power generation system of this embodiment is improved on the basis of any one of the embodiments 1-4, such as Figure 3 As shown, the leakage gas return part 8 includes a main return gas pipeline, and a return gas bypass and a return gas pressure relief bypass are arranged in parallel on one side of the main return gas pipeline. The inlet end of the return gas bypass is connected to the main return gas pipeline, and the outlet end of the return gas bypass is connected to the isolation gas supply part 7; the first return gas stop valve, the stop three-valve group, and the second return gas stop valve are arranged in series on the return gas bypass, and a pressure differential transmitter is arranged in parallel on one side of the stop three-valve group; the first return gas gate valve, the bursting disc, and the second return gas gate valve are arranged in series on the return gas pressure relief bypass.

[0051] Furthermore, a chain stop bypass is provided in parallel on one side of the main return air pipeline, and a first stop stop valve, a stop three-valve group, and a second stop stop valve are provided in series on the chain stop bypass. A flow meter is provided in parallel on one side of the stop three-valve group.

[0052] A differential pressure transmitter is connected to the central control terminal. The differential pressure transmitter on the return gas bypass detects the pressure difference between the leaked gas pressure and the isolation gas inlet pressure and transmits it to the central control terminal. When the pressure difference between the leaked gas pressure and the isolation gas inlet pressure exceeds 0.05 MPa, the central control terminal initiates feedback control to shut down expander 4. Simultaneously, the central control terminal closes the first and second stop valves on the interlocking shutdown bypass, effectively shutting down the machine. When the leaked gas return pressure 8 exceeds the safety threshold, the rupture disc on the return gas pressure relief bypass ruptures, providing emergency pressure relief.

[0053] The rest of this embodiment is the same as any one of Embodiments 1-4, so it will not be described again.

[0054] The above is only the preferred embodiment of the present application, and does not limit the present application in any form. Any simple modification or equivalent change of the above embodiment according to the technical essence of the present application falls within the protection scope of the present application.

Claims

1. A dry gas sealed turbine expander skid-mounted power generation system, comprising a skid-mounted base (1), characterized in that: The skid-mounted base (1) is modularly skid-mounted with a motor (2), a reducer (3), an expander (4), and a dry gas sealing device (5). The output end of the motor (2) is transmission-connected to the input end of the reducer (3), and the output end of the reducer (3) is transmission-connected to the rotor of the expander (4). The expander (4) is provided with a sealing gas area and an isolation gas area. The dry gas sealing device (5) includes a sealing gas supply part (6), an isolation gas supply part (7), and a leakage gas return part (8). The inlet end of the sealing gas supply part (6) is connected to the expander (4). The inlet gas source is connected to the sealing gas supply part (6), and the outlet end of the sealing gas supply part (6) is connected to the sealing gas area; the inlet end of the isolation gas supply part (7) is connected to the isolation gas source, and the outlet end of the isolation gas supply part (7) is connected to the isolation gas area; a leakage gas interface is provided inside the expander (4), and the leakage gas interface is connected to the leakage gas return part (8), and the leakage gas return part (8) is also connected to the isolation gas supply part (7) through a return gas bypass; the leakage gas return part (8) includes a main return gas pipeline, and a return gas bypass and a return gas pressure relief are provided in parallel on one side of the main return gas pipeline. Bypass, the inlet end of the return gas bypass is connected to the main return gas pipeline, and the outlet end of the return gas bypass is connected to the isolation gas supply part (7); the return gas bypass is sequentially provided with a first return gas stop valve, a stop three-valve group, and a second return gas stop valve in series, and a pressure differential transmitter is provided in parallel on one side of the stop three-valve group; the return gas pressure relief bypass is sequentially provided with a first return gas gate valve, a bursting disc, and a second return gas gate valve in series; the sealing gas supply part (6) includes a sealing gas inlet pipeline, a sealing gas pressure regulating pipeline, and a sealing gas supply pipeline, and the inlet end of the sealing gas inlet pipeline is connected to the expander ( 4) is connected to the inlet air source, and two sealing gas pressure regulating pipelines are arranged in parallel at the outlet end of the sealing gas inlet pipeline, and a sealing gas main pressure regulating valve, a filter, and a sealing gas auxiliary pressure regulating valve are sequentially connected in series on the sealing gas pressure regulating pipeline; the outlet ends of the two sealing gas pressure regulating pipelines are both connected to the sealing gas supply pipeline, and a sealing gas stop valve, a flow meter, and a pressure gauge are sequentially connected in series on the sealing gas supply pipeline, the outlet end of the sealing gas supply pipeline is connected to the sealing gas area, and a sealing gas pressure difference transmitter is provided between the outlet end of the sealing gas inlet pipeline and the inlet end of the sealing gas supply pipeline.

2. The dry gas sealed turbine expander skid-mounted power generation system according to claim 1, characterized in that: The isolation gas supply part (7) comprises an isolation gas inlet pipeline and an isolation gas supply pipeline. The inlet end of the isolation gas inlet pipeline is connected to the isolation gas source, and the outlet end of the isolation gas inlet pipeline is connected to the isolation gas supply pipeline through a orifice plate. The isolation gas inlet pipeline is provided with an isolation gas pressure regulating part and an isolation gas pressure reducing part in series.

3. The dry gas sealed turbine expander skid-mounted power generation system according to claim 2, characterized in that: The isolation gas pressure regulating part includes an isolation gas main pressure regulating valve, a filter, and an isolation gas auxiliary pressure regulating valve arranged in series. An isolation gas pressure differential transmitter is provided between the inlet end of the isolation gas main pressure regulating valve and the outlet end of the isolation gas auxiliary pressure regulating valve.

4. The dry gas sealed turbine expander skid-mounted power generation system according to claim 2, characterized in that: The isolation gas pressure reduction part includes a pressure reducing pipeline and a pressure reducing bypass connected in parallel. The pressure reducing pipeline is sequentially connected in series with a first ball valve, an isolation gas pressure reducing valve, and a second ball valve. The pressure reducing bypass is provided with an isolation gas stop valve.

5. The dry gas sealed turbine expander skid-mounted power generation system according to claim 2, characterized in that: An isolation gas monitoring bypass is arranged in parallel on one side of the isolation gas inlet pipeline, and an isolation gas bypass stop valve, a double stop valve group, and a pressure transmitter are arranged in series on the isolation gas detection bypass.

6. The dry gas sealed turbine expander skid-mounted power generation system according to claim 5, characterized in that: The invention also includes a circulating lubrication device (9), wherein the oil supply end of the circulating lubrication device (9) is connected to the motor (2), the reducer (3), and the expander (4), respectively, and the on-off between the oil supply end of the circulating lubrication device (9) and the expander (4) is feedback-controlled according to the pressure of the isolation gas monitoring bypass.

7. The dry gas sealed turbine expander skid-mounted power generation system according to claim 1, characterized in that: A chain stop bypass is also provided in parallel on one side of the main return air pipeline, on which a first stop stop valve, a stop three-valve group, and a second stop stop valve are sequentially provided in series, and a flow meter is provided in parallel on one side of the stop three-valve group.

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