Pipeline type expansion power generation all-in-one machine and power generation system

Abstract

The invention discloses a pipeline type expansion power generation all-in-one machine and a power generation system, and belongs to the technical field of turbine power generation fusion. The pipeline type expansion power generation all-in-one machine comprises a shell, an impeller, a rotor and a stator, and the impeller, the rotor and the stator are coaxially arranged in the shell; and a fixed nozzle is arranged on the peripheral side of the impeller, and the gas in the cavity is conveyed to the impeller through the fixed nozzle and drives the impeller to rotate. Gas can cool a bearing, a stator and a rotor in a shell, high-pressure gas enters a motor from a gas inlet, flows through an inner cavity of the motor and enters a fixed nozzle to do work through expansion of the nozzle, pressure energy is converted into kinetic energy to blow an impeller to rotate, the impeller drives a coaxial generator rotor to rotate, and the gas continues to expand and depressurize in the impeller; pressure energy and internal energy are converted into mechanical energy output power, and the mechanical energy output power and a generator are connected to a grid for power generation.

Description

Technical Field

[0001] This invention relates to the field of turbine power generation integration technology, specifically to a pipeline-type expansion generator and power generation system. Background Technology

[0002] Throughout the entire process of natural gas extraction, purification, transportation, distribution, and gate station operations, medium- and high-pressure natural gas needs to be depressurized step-by-step to meet the pressure demands of downstream production units before being delivered to users. Currently, the depressurization process in natural gas pipelines is achieved using pressure-reducing valves, where pressure energy is entirely consumed in overcoming flow resistance, resulting in a significant waste of pressure energy.

[0003] Currently, the most mature structural configuration for natural gas differential pressure generator sets on the market is a skid-mounted integrated structure that combines a gear-assembled radial expander and a generator. The unit is equipped with a gear-assembled expander, generator, coupling, dry gas seal and control panel, lubrication system, sealing gas system, cooling water system, etc.

[0004] However, this type of natural gas differential pressure generator set has many problems, such as numerous components, complex structure, large footprint, high manufacturing and operation and maintenance costs, and many potential leakage risks. Summary of the Invention

[0005] To overcome at least one of the aforementioned drawbacks, this invention provides a pipe-type integrated expansion generator and power generation system. The objective of this invention can be achieved by employing the following technical solution:

[0006] In a first aspect, this application provides a pipeline-type expansion generator for use in a gas delivery pipeline. The pipeline-type expansion generator includes a housing and an impeller and a stator coaxially arranged within the housing. The housing includes a coaxially arranged air inlet and air outlet, allowing gas to enter through the air inlet and exit through the air outlet via a chamber between the stator and the housing. A fixed nozzle is provided on the outer periphery of the impeller, and gas in the chamber is delivered to the impeller through the fixed nozzle, driving the impeller to rotate.

[0007] In one possible implementation, the rotor and stator include a rotor and a stator, and the integrated tubular expansion generator further includes:

[0008] An imported bearing assembly is disposed in an imported bearing cavity on the stator to support the end of the rotor near the air inlet.

[0009] An outlet bearing assembly is disposed in the outlet bearing cavity on the stator and is used to support the end of the rotor near the air outlet.

[0010] In one possible implementation, both the inlet bearing assembly and the outlet bearing assembly include:

[0011] A magnetic levitation support bearing is disposed on the stator and is used to apply a magnetic force to the rotor in the radial direction so that the rotor is in a levitation state;

[0012] A protective bearing is disposed on the stator to provide support for the rotor when it is in a non-suspended state.

[0013] In one possible implementation, the imported bearing assembly further includes:

[0014] A magnetic levitation thrust bearing is mounted on the stator and is used to adjust the position of the rotor axially.

[0015] In one possible implementation, the integrated pipeline expansion generator further includes:

[0016] A sealing element is disposed on the housing. The first sealing surface of the sealing element is provided with a plurality of sealing teeth that cooperate with the rotor with a small clearance. The second sealing surface of the sealing element is provided with a plurality of sealing teeth that cooperate with the impeller with a small clearance.

[0017] In one embodiment, a balancing air chamber is formed between the seal, the rotor, and the impeller, and the pipeline-type expansion generator further includes:

[0018] A balancing gas pipeline, one end of which is connected to the balancing gas chamber, is used to transport the gas in the balancing gas chamber to the gas outlet to regulate the gas pressure in the balancing gas chamber.

[0019] In one possible implementation, the impeller includes an impeller disk and a plurality of blades disposed on the impeller disk, the blades facing the air outlet.

[0020] In one possible implementation, the fixed nozzle is disposed at the constricted outlet of the chamber, with the output end of the fixed nozzle facing the blade, so that the gas in the chamber is accelerated by the fixed nozzle and comes into contact with the blade, thereby driving the impeller and the rotor to rotate.

[0021] A second aspect of this application provides a power generation system, including any of the pipeline-type expansion generators described in the first aspect, wherein the pipeline-type expansion generator is connected to a natural gas transmission pipeline.

[0022] In one possible implementation, the air inlet of the pipeline-type expansion generator is connected to a first natural gas transmission pipeline, and the air outlet of the pipeline-type expansion generator is connected to a second natural gas transmission pipeline. The temperature of the natural gas in the first natural gas transmission pipeline is below 40°C. The natural gas in the first natural gas transmission pipeline can be transported to the second natural gas transmission pipeline through the pipeline-type expansion generator and used to cool the pipeline-type expansion generator.

[0023] The beneficial technical effects of this invention are as follows: According to this disclosure, the integrated pipeline expansion generator and power generation system include a housing and an impeller and stator coaxially arranged on the housing. This allows the bearings and rotor / stator to be cooled in the housing during gas transport. High-pressure gas enters the motor from the inlet, flows through the internal chamber of the motor, and enters the fixed nozzle. The gas expands through the nozzle and performs work, converting pressure energy into kinetic energy to drive the impeller to rotate. The impeller drives the coaxial generator rotor to rotate. The gas continues to expand and depressurize in the impeller, converting pressure energy and internal energy into mechanical energy to output power, which is then connected to the grid for power generation. The rotor and impeller of this integrated pipeline expansion generator are directly connected, eliminating the need for gear transmission to match the speed and the need for a gearbox. This improves the output power and mechanical efficiency of the unit, and the structure is compact, small in size, and easy to assemble and disassemble. Attached Figure Description

[0024] The following are given by way of example and without limitation in the accompanying drawings:

[0025] Figure 1 A schematic diagram of the internal structure of the present invention is shown;

[0026] Figure 2 A schematic diagram of the internal structure of a conventional skid-mounted expander generator is shown.

[0027] In the diagram: 1. Shell; 2. Magnetic levitation support bearing; 3. Protective bearing; 4. Magnetic levitation thrust bearing; 5. Inlet bearing cavity; 6. Outlet bearing cavity; 7. Impeller; 8. Fixed nozzle; 9. Balancing air cavity; 10. Balancing air pipeline; 11. Dry air seal; 12. Movable nozzle; 13. Nozzle adjustment mechanism; 14. Low-speed expander rotor; 15. High-speed expander rotor; 16. Gear. Detailed Implementation

[0028] In the following detailed disclosure, these embodiments are fully described with reference to the accompanying drawings. In order to enable those skilled in the art to understand and clarify the technical solution of the present invention more clearly, the embodiments described below are not limited thereto. The present invention will be further described in detail below with reference to the embodiments and the accompanying drawings.

[0029] In this invention, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "install," "connect," "link," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "link" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0030] In the description of this invention, it should be understood that the terms "upper," "lower," "left," "right," "front," "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0031] like Figure 2 As shown, a traditional skid-mounted natural gas differential pressure expander generator set typically includes a generator, a gear-assembled expander, a lubrication system, a dry gas seal control panel, a base, and a coupling. The generator rotor is powered by the expander impeller 7 via a high-speed expander rotor 15, a gear 16, a low-speed expander rotor 14, and a coupling. The expander's inlet and outlet are connected to two natural gas pipelines. Natural gas from one pipeline enters the expander and flows towards the impeller 7 through a movable nozzle 12. The blade angle of the movable nozzle 12 is adjusted by a nozzle adjustment mechanism 13. After the natural gas is ejected through the nozzle, it drives the impeller 7 to rotate and then enters the other natural gas pipeline. The rotation of the impeller 7 drives the generator rotor to rotate. Because a gearbox is required to meet the expander's speed requirements, the unit suffers from high mechanical losses and low expander output power. The lubrication system provides necessary lubrication for the moving parts. To reduce friction and wear; the dry gas seal control panel is used to form a dry gas seal 11 at the end of the high-speed expander rotor 15, reducing the rotor axial thrust and reducing the static frictional resistance torque between the rotor and stator during high-pressure start-up; the cooling system usually absorbs and removes a large amount of heat generated during operation through circulating cooling medium; the skid-mounted natural gas differential pressure expander generator needs to achieve continuous operation through the above structure, resulting in a large size, large footprint, high cost, and complicated installation and disassembly; under long-term operation, due to the complex mechanism of the movable nozzle 12, there is a risk of natural gas leakage at the dynamic seal of the nozzle adjustment mechanism 13 (such as the drive shaft); the complex structure of the skid-mounted natural gas differential pressure expander generator set results in a large number of risk points for natural gas leakage, such as the expander, dry gas seal control panel, and sealing gas pipeline, resulting in poor equipment operation safety and high operation and maintenance costs.

[0032] The first aspect of this application, as Figure 1 As shown, a pipeline-type expansion generator is provided for use in gas transmission pipelines. The pipeline-type expansion generator includes a housing 1 and an impeller 7 and a rotor and stator inside the housing 1. The housing 1 includes an air inlet and an air outlet arranged coaxially so that gas can enter through the air inlet and exit through the air outlet through the chamber between the rotor and stator and the housing 1. A fixed nozzle 8 is provided on the outer periphery of the impeller 7. The gas in the chamber is delivered to the impeller 7 through the fixed nozzle 8 and drives the impeller 7 to rotate.

[0033] The pipeline-type expansion generator provided in this embodiment is installed on the gas delivery pipeline like a valve, becoming part of the pipeline. The inlet and outlet are coaxially arranged. Through axial air intake and axial exhaust, high-pressure gas enters the motor from the inlet, flows through the internal chamber of the motor and enters the fixed nozzle 8. The gas expands through the nozzle and does work, converting pressure energy into kinetic energy to drive the impeller 7 to rotate. The impeller 7 drives the coaxial generator rotor to rotate. The gas continues to expand and depressurize in the impeller 7, converting pressure energy and internal energy into mechanical energy to output power. It is connected to the grid to generate electricity. The overall structure is compact, small in size and easy to disassemble and assemble.

[0034] The pipeline-type expansion generator provided in this embodiment includes a housing 1 and an impeller 7 and a stator coaxially arranged inside the housing 1. This allows the bearings and rotor to be cooled by the housing 1 during the transport of low-temperature gas, ensuring that the generator can operate continuously and efficiently, improving the efficiency and stability of the entire system, simplifying the system structure, eliminating the need for a supporting cooling system, and simultaneously absorbing the heat generated by the electromagnetic bearings and the generator's rotor and stator during operation, increasing the gas temperature, i.e., increasing the enthalpy value, and improving the work capacity of the pipeline-type expansion generator.

[0035] The pipeline-type expansion generator provided in this embodiment replaces the traditional explosion-proof generator with a high-speed permanent magnet generator. The impeller 7 and the rotor and stator are coaxially arranged inside the housing 1. The rotor of the housing 1 is directly connected to the expansion impeller 7, eliminating the need for speed matching through gear 16 and the need for a matching gearbox. This simplifies the system structure, improves the unit's output power and mechanical efficiency, enhances its compactness and integration, reduces its size, and makes it easier to disassemble and assemble.

[0036] In one possible implementation, such as Figure 1 As shown, the rotor and stator include a rotor and a stator. The pipeline-type expansion generator also includes an inlet bearing assembly and an outlet bearing assembly. The inlet bearing assembly is located in the inlet bearing cavity 5 on the stator and is used to support the end of the rotor near the air inlet. The outlet bearing assembly is located in the outlet bearing cavity 6 on the stator and is used to support the end of the rotor near the air outlet.

[0037] The stator has an inlet bearing cavity 5 for accommodating the inlet bearing assembly and an outlet bearing cavity 6 for accommodating the outlet bearing assembly. The inlet bearing assembly and the outlet bearing assembly are located at both ends of the rotor to support the rotor rotation and ensure that the rotor rotates smoothly in the rotating magnetic field generated by the stator.

[0038] In one possible implementation, such as Figure 1 As shown, both the inlet bearing assembly and the outlet bearing assembly include a magnetic levitation support bearing 2 and a protective bearing 3. The magnetic levitation support bearing 2 is mounted on the stator and is used to apply magnetic force to the rotor in the radial direction to make the rotor levitate. The protective bearing 3 is mounted on the stator and is used to support the rotor in the non-levitated state.

[0039] The inlet bearing cavity 5 and outlet bearing cavity 6 serve as stator components, housing a magnetic levitation support bearing 2 and a protective bearing 3 to provide support for the bearings. The magnetic levitation support bearing 2 supports the rotor using the principle of magnetic interaction. During operation, the rotor is levitated by electromagnetic force, eliminating mechanical contact between the rotor and the bearing. This achieves contactless support and rotation of the rotor, reducing mechanical friction, improving conversion efficiency, and enabling precise control of the rotor's position and rotation. In the event of a failure of the magnetic levitation control system or when the machine is not in use, the protective bearing 3 provides support for the rotor, preventing rotor misalignment or hard contact with the stator components, thus protecting the safety of the entire machine.

[0040] In one possible implementation, such as Figure 1 As shown, the imported bearing assembly also includes a magnetic levitation thrust bearing 4, which is mounted on the stator and used to adjust the position of the rotor along the axial direction.

[0041] Among them, the magnetic levitation thrust bearing 4 controls the axial position of the rotor and the bearing through electromagnetic force, balances the axial thrust generated by the pressure difference during rotor operation, and precisely controls the axial position between the rotor and the bearing through electromagnetic force, ensuring that the rotor can remain stable when rotating at high speed, which significantly improves the operating efficiency and life of the equipment.

[0042] Understandably, the radial and axial positions of the rotor can be precisely controlled by the magnetic levitation support bearing 2 and the magnetic levitation thrust bearing 4. This is especially suitable for high-speed operation. The axial thrust generated by the pressure difference can be balanced by the electromagnetic force of the magnetic levitation thrust bearing 4, thereby ensuring the smooth operation of the rotor and improving the accuracy and stability of high-speed rotation. Compared with traditional bearing structures, it has advantages such as no friction, no lubrication, no oil pollution, low energy consumption, and low noise. It does not require a matching lubrication system, which simplifies the overall structure, reduces costs, and improves the operating efficiency and service life of the unit. It not only avoids the mechanical contact and friction in traditional sliding bearings, but also, through current control, the bearings and rotor operate in a non-contact state during start-up, operation, and shutdown, thus avoiding the problem of difficulty in starting under high pressure.

[0043] In one possible implementation, such as Figure 1 As shown, the pipeline-type expansion generator also includes a sealing element. The sealing element is installed on the housing 1. The first sealing surface of the sealing element has several sealing teeth that fit with the rotor with a small clearance. The second sealing surface of the sealing element has several sealing teeth that fit with the impeller 7 with a small clearance.

[0044] The seals between the seal and the rotor, and between the seal and the impeller 7, are all pulley seals. The seals are designed with multiple sealing teeth. There is a small gap between the sealing teeth of the first sealing surface and the rotor, and a small gap between the sealing teeth of the second sealing surface and the impeller 7. The high-pressure gas is throttled and depressurized after passing through the gaps between each sealing tooth and the rotor or impeller 7. Specifically, the gas will encounter a certain resistance when passing through the gap of each sealing tooth, thereby gradually reducing the gas pressure and thus reducing leakage and improving the sealing performance of the equipment. The leakage-preventing effect of the seal reduces the amount of high-pressure natural gas entering the balance gas chamber 9, enabling the machine to generate higher power.

[0045] The two seals are not welded, but are machined into a ring structure, usually using aluminum seals. There is no need for a dry gas seal control panel. The pipeline expansion generator does not need to use seals to prevent external leakage, such as dry gas seals. Therefore, there is no need for a dry gas seal control panel, which effectively avoids the problem of natural gas leakage. It also simplifies the overall structure, reduces costs, and has the advantages of simple structure, easy manufacturing and maintenance.

[0046] In one possible implementation, such as Figure 1 As shown, a balancing air chamber 9 is formed between the seal, rotor and impeller 7. The pipeline-type expansion generator also includes a balancing air pipeline 10, one end of which is connected to the balancing air chamber 9 to transport the gas in the balancing air chamber 9 to the outlet to regulate the air pressure in the balancing air chamber 9.

[0047] The gas in the balancing gas chamber 9 comes from two sources: one is gas leaking from the motor cavity through a seal, and the other is gas leaking from the impeller 7 inlet through a seal on the impeller 7 back plate. Since the gas pressure in the balancing gas chamber 9 is much higher than the gas pressure at the impeller 7 outlet, the impeller 7 generates a large axial thrust due to the pressure difference between the back plate and the outlet. Given the high pressure of the natural gas medium, for the single-stage impeller 7 structure of this application, the rotor axial force mainly originates from the impeller 7, and the axial force is generally large, exceeding the load-bearing limit of the magnetic levitation thrust bearing 4. Therefore, a balancing gas pipeline 10 and a valve can be installed to connect the balancing gas chamber 9 and the impeller 7 outlet pipeline. The gas flow direction in the balancing gas pipeline 10 is as follows: Figure 1 As indicated by the arrow, the gas pressure in the balancing chamber 9 is reduced, and the axial thrust is reduced to the range that the magnetic levitation thrust bearing 4 can bear, ensuring the stable operation of the unit. By precisely controlling the axial position of the rotor through electromagnetic force, the influence of axial thrust can be balanced and limited, further ensuring the safety and reliability of the unit.

[0048] In one possible implementation, such as Figure 1 As shown, the impeller 7 includes an impeller disk and several blades disposed on the impeller disk, with the blades facing the direction of the air outlet.

[0049] The blades can be configured to face the outlet, and the gas drives the impeller 7 to rotate and is discharged through the outlet.

[0050] In one possible implementation, such as Figure 1 As shown, the fixed nozzle 8 is located at the converging outlet of the chamber, and the output end of the fixed nozzle 8 faces the blade, so that the gas in the chamber is accelerated by the fixed nozzle 8 and comes into contact with the blade, thereby driving the impeller 7 and the rotor to rotate.

[0051] The fixed nozzle 8 is located at the converging outlet of the chamber, which allows the gas output from the fixed nozzle 8 to be concentrated and accelerated, forming a gas flow with a higher velocity. The output end of the fixed nozzle 8 faces the blade directly. When the gas is accelerated through the fixed nozzle 8, it impacts the blade at a higher speed, which not only improves the kinetic energy transfer efficiency of the gas, but also ensures that the gas can effectively contact the blade. During the contact process between the gas and the blade, the blade will be pushed by the gas and start to rotate. The impeller 7 will also start to rotate and drive the rotor to rotate. This rotation process converts the kinetic energy of the gas into the mechanical energy of the impeller 7, thereby realizing the conversion and utilization of energy.

[0052] Among them, the fixed nozzle 8 consists of multiple fixed blades evenly distributed in the circumferential direction, installed upstream of the impeller 7. Natural gas can achieve energy conversion in the fixed nozzle 8, converting pressure energy into kinetic energy. The gas at the nozzle outlet has a higher speed, which drives the impeller 7 to rotate and further expand to do work and generate electricity.

[0053] In this embodiment, the integrated pipeline expansion generator replaces the movable nozzle 12 with a fixed nozzle 8, eliminating the need for a nozzle adjustment mechanism 13, thus reducing the risk of natural gas leakage. The structure is simpler and easier to install and disassemble. A four-quadrant converter can also be used to meet the adjustment requirements for grid connection and changes in operating conditions during operation. It has frequency and voltage regulation functions, and can easily achieve grid-connected power generation at any speed, unaffected by the accuracy of the regulating valve or changes in operating conditions. It meets the needs of changing operating conditions by using variable speed performance adjustment instead of imported nozzle opening adjustment.

[0054] The pipeline-type expander generator provided in this application adopts an external expander impeller 7 structure. The rotor is designed as a rigid rotor, which has good stability and high operational safety. It does not require a cooling gas source, sealing gas source, cooling water, or lubricating oil. It also does not require supporting cooling water pipelines, sealing gas pipelines, lubricating oil pipelines, and cooling gas pipelines, thus reducing system complexity. Given the fewer supporting devices, the number of equipment requiring maintenance is reduced, resulting in lower operating and maintenance costs, reduced risk of natural gas leakage, and improved safety. It has the advantages of compact structure, small size, high safety, convenient disassembly and assembly, and good economy.

[0055] The second aspect of this application, as Figure 1 As shown, a power generation system is provided, including any one of the pipeline-type expansion generators in the first aspect, wherein the pipeline-type expansion generator is connected to a natural gas transmission pipeline.

[0056] The inlet of the pipeline-type expansion generator is connected to the first natural gas transmission pipeline, and the outlet of the pipeline-type expansion generator is connected to the second natural gas transmission pipeline. The temperature of the natural gas in the first natural gas transmission pipeline is below 40°C. The natural gas in the first natural gas transmission pipeline can be transported to the second natural gas transmission pipeline through the pipeline-type expansion generator and cool the pipeline-type expansion generator.

[0057] In specific implementation, the power generation system provided in this application is applicable to the natural gas differential pressure power generation industry with a power generation capacity of less than 800kW, an inlet pressure of less than 10MPaA, and an inlet temperature of less than 40℃. The natural gas temperature in the first natural gas transmission pipeline is less than 40℃. When the natural gas flows through the inside of the generator, it absorbs the current heat generated by the electromagnetic bearing and the generator rotor and stator during operation, which increases the temperature of the natural gas, that is, increases the enthalpy value, improves the work capacity, and also directly cools the bearing and rotor and stator.

[0058] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0059] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0060] In view of the detailed description above, these and other changes can be made to these embodiments, and this written description includes embodiments of the best mode that disclose the invention. The patent scope of the invention is defined by the claims, which are not limited by this disclosure. The scope of protection of the invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the invention disclosed herein, based on the technical solutions and concepts of the invention, are within the scope of protection of the invention.

Claims

1. A pipeline-type integrated expander generator, characterized in that, The pipeline-type expansion generator is used in gas transmission pipelines. It includes a housing (1) and an impeller (7) and a rotor and stator coaxially arranged inside the housing (1). The housing (1) includes an air inlet and an air outlet coaxially arranged so that gas can enter through the air inlet and exit through the air outlet through the chamber between the rotor and the housing (1). The outer circumference of the impeller (7) is provided with a fixed nozzle (8). The gas in the chamber is transported to the impeller (7) through the fixed nozzle (8) and drives the impeller (7) to rotate.

2. The integrated pipeline expansion generator according to claim 1, characterized in that, The rotor and stator include a rotor and a stator, and the integrated pipeline expansion generator also includes: An imported bearing assembly is disposed in the imported bearing cavity (5) on the stator to support the end of the rotor near the air inlet. An outlet bearing assembly is disposed in the outlet bearing cavity (6) on the stator and is used to support the end of the rotor near the outlet.

3. The integrated pipeline expansion generator according to claim 2, characterized in that, Both the imported bearing assembly and the exported bearing assembly include: Magnetic levitation support bearing (2), the magnetic levitation support bearing (2) is disposed on the stator, and is used to apply magnetic force to the rotor in the radial direction so that the rotor is in a levitation state; A protective bearing (3) is disposed on the stator to provide support for the rotor in a non-suspended state.

4. The integrated pipeline expansion generator according to claim 3, characterized in that, The imported bearing assembly also includes: A magnetic levitation thrust bearing (4) is disposed on the stator and is used to adjust the position of the rotor along the axial direction.

5. The integrated pipeline expansion generator according to claim 4, characterized in that, The integrated pipeline-type expansion generator also includes: A sealing element is provided on the housing (1). The first sealing surface of the sealing element is provided with a plurality of sealing teeth that are in close contact with the rotor with a small clearance. The second sealing surface of the sealing element is provided with a plurality of sealing teeth that are in close contact with the impeller (7) with a small clearance.

6. The integrated pipeline expansion generator according to claim 5, characterized in that, A balance air chamber (9) is formed between the seal, the rotor, and the impeller (7). The pipeline-type expansion generator also includes: A balancing gas pipeline (10) is provided, one end of which is connected to the balancing gas chamber (9) for transporting the gas in the balancing gas chamber (9) to the outlet to regulate the gas pressure in the balancing gas chamber (9).

7. The integrated pipeline expansion generator according to claim 2, characterized in that, The impeller (7) includes an impeller disk and a plurality of blades disposed on the impeller disk, the blades being directed toward the air outlet.

8. The integrated pipeline-type expander generator according to claim 7, characterized in that, The fixed nozzle (8) is located at the converging outlet of the chamber, and the output end of the fixed nozzle (8) faces the blade, so that the gas in the chamber is accelerated by the fixed nozzle (8) and comes into contact with the blade, thereby driving the impeller (7) and the rotor to rotate.

9. A power generation system, characterized in that, Includes the pipeline-type expansion generator as described in any one of claims 1-8, wherein the pipeline-type expansion generator is connected to a natural gas transmission pipeline.

10. The power generation system according to claim 9, characterized in that, The inlet of the pipeline-type expansion generator is connected to the first natural gas transmission pipeline, and the outlet of the pipeline-type expansion generator is connected to the second natural gas transmission pipeline. The temperature of the natural gas in the first natural gas transmission pipeline is below 40°C. The natural gas in the first natural gas transmission pipeline can be transported to the second natural gas transmission pipeline through the pipeline-type expansion generator and cool the pipeline-type expansion generator.

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