Boundary layer turbine structure for natural gas differential pressure power generation

Abstract

The boundary layer turbine structure comprises a turbine shell, a turbine cover plate, a motor bin, a motor cover plate and a generator, and the motor bin is connected with the turbine cover plate; a wafer set is installed in the turbine shell, a generator is installed in the motor bin, and the generator and the wafer set are installed on the same rotating shaft. The turbine shell is provided with an air inlet, the motor cover plate is provided with an air outlet, the turbine shell, the wafer set, the turbine cover plate, the motor bin and the motor cover plate are all provided with air channels for natural gas to pass through, and the air channels are communicated. The generator is arranged at the downstream of the wafer group, the expanded low-temperature gas can be directly used for cooling the generator, and meanwhile the problem that cold energy caused by expansion cannot be consumed is solved; through the integrated design, the system is not provided with a dynamic sealing part, the leakage risk is avoided, and the safety of a gas application scene can be improved.

Description

Technical Field

[0001] This application relates to the field of natural gas power generation technology, specifically to a boundary layer turbine structure for natural gas differential pressure power generation. Background Technology

[0002] In long-distance natural gas pipeline systems, pressure regulating stations reduce gas pressure through throttling valves to meet downstream gas demand. During this process, a significant amount of pressure energy (pressure differential potential energy) is wasted as throttling losses. Statistics show that the pressure differential at a single station can reach several megapascals, indicating significant potential for recovery. Currently, some technologies attempt to convert this pressure differential energy into electrical energy using turbine machinery, but the following problems exist:

[0003] 1. Traditional turbines have complex structures: they rely on bladed turbines, are susceptible to wear from natural gas impurities, and have high maintenance costs;

[0004] 2. Insufficient heat dissipation of generator: Chinese patent application number 202321994680.4 discloses a generator based on a Tesla turbine, which arranges the generator and turbine structure side by side. High-temperature gas cannot flow through the motor, resulting in heat dissipation difficulties and affecting system stability and lifespan.

[0005] 3. Poor adaptability: The fixed nozzle design cannot match different operating conditions (such as flow rate and differential pressure fluctuations), resulting in low energy efficiency.

[0006] 4. Leakage risk: The dynamic sealing structure is prone to natural gas leakage due to long-term wear, posing a safety hazard. Utility Model Content

[0007] Therefore, this application provides a boundary layer turbine structure for natural gas differential pressure power generation to solve the problems of complex structure, difficult heat dissipation, poor adaptability and high leakage risk in the prior art.

[0008] To achieve the above objectives, this application provides the following technical solution:

[0009] A boundary layer turbine structure for natural gas differential pressure power generation includes a turbine housing, a turbine cover plate, a generator compartment, a generator cover plate, and a generator. The generator compartment is connected to the turbine cover plate. A circular plate assembly is installed inside the turbine housing, and a generator is installed inside the generator compartment. The generator and the circular plate assembly are mounted on the same rotating shaft.

[0010] The turbine housing is provided with an air inlet, and the motor cover is provided with an air outlet. The turbine housing, the disc assembly, the turbine cover, the motor compartment, and the motor cover are all provided with air passages for natural gas to pass through, and the air passages are interconnected.

[0011] Optionally, both the disc assembly and the generator rotor are fixedly connected to the rotating shaft.

[0012] Optionally, the turbine housing has an internal mounting cavity for accommodating a nozzle located on one side of the disc assembly, and the turbine cover plate is used to press and fix the nozzle; the inlet end of the nozzle is connected to the inlet of the turbine housing, and the outlet end is connected to the disc assembly.

[0013] Optionally, the air inlet and air outlet are on the same axis.

[0014] Optionally, bearings are installed between the rotating shaft and the turbine housing, the turbine cover plate, and the motor cover plate, respectively.

[0015] Optionally, the motor compartment is provided with a cable seal for sealing the cable, and the outside of the motor cover is connected with a gland for fixing the cable.

[0016] Optionally, an air inlet is fixed to the outside of the turbine housing, and the air inlet is connected to the air inlet; an air outlet is fixed to the outside of the motor cover, and the air outlet is connected to the air outlet.

[0017] Optionally, the motor compartment is equipped with a rectifier.

[0018] Compared with the prior art, this application has at least the following beneficial effects:

[0019] 1. Because the generator is located downstream of the turbine structure, the expanded, low-temperature gas (5-30°C lower than the inlet temperature) can flow through the generator interior, directly carrying away the winding heat without the need for an additional cooling system. This avoids insulation aging caused by high temperatures and extends the system's lifespan. Simultaneously, it can absorb the cold energy generated by the expansion, reducing the risk of freezing and blockage.

[0020] Furthermore, when natural gas passes through the disc assembly, it can drive the disc assembly to rotate, which makes the high-speed characteristics of the axial permanent magnet generator perfectly match the fluid dynamics of the boundary layer turbine structure, reducing wear and improving energy conversion efficiency.

[0021] 2. The nozzles can be replaced by removing and installing the turbine cover, thereby supporting rapid adjustment of the flow cross-sectional area to adapt to different natural gas flow ranges.

[0022] 3. Since both the disc assembly and the generator rotor are fixed on the shaft, this integrated design eliminates the risk of leakage and meets the natural gas explosion-proof standards, thus improving the safety of gas application scenarios.

[0023] 4. The coaxial design of the air inlet and outlet reduces the difficulty of pipeline modification and can effectively save installation costs. Attached Figure Description

[0024] To more intuitively illustrate the prior art and this application, exemplary drawings are provided below. It should be understood that the specific shapes and structures shown in the drawings should not generally be regarded as limiting conditions for implementing this application; for example, based on the technical concept disclosed in this application and the exemplary drawings, those skilled in the art are able to easily make conventional adjustments or further optimizations to the addition / reduction / classification, specific shapes, positional relationships, connection methods, size ratios, etc. of certain units (components).

[0025] Figure 1 A schematic diagram of a boundary layer turbine structure for natural gas differential pressure power generation is provided in an embodiment of this application;

[0026] Figure 2 A front view of a boundary layer turbine structure for natural gas differential pressure power generation provided in an embodiment of this application;

[0027] Figure 3 for Figure 2 Sectional view at point AA;

[0028] Figure 4 This is a schematic diagram of the natural gas path in a boundary layer turbine structure for natural gas differential pressure power generation, provided as an embodiment of this application.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1. Turbine housing; 2. Turbine cover plate; 3. Motor compartment; 4. Motor cover plate; 5. Generator; 6. Disc assembly; 7. Shaft; 8. Inlet; 9. Outlet; 10. Nozzle; 11. Inlet port; 12. Outlet port; 13. Bearing; 14. Rectifier; 15. Cable seal; 16. Gland head; 17. Junction box cover plate. Detailed Implementation

[0031] The present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] In the description of this application: unless otherwise stated, "a plurality of" means two or more. The terms "first," "second," "third," etc., in this application are intended to distinguish the objects referred to and do not have any special meaning in terms of technical connotation (e.g., they should not be construed as an emphasis on importance or order). Expressions such as "comprising," "including," and "having" also mean "not limited to" (certain units, components, materials, steps, etc.).

[0033] The terms used in this application, such as "upper," "lower," "left," "right," and "middle," are generally used to indicate the general relative positional relationship for the purpose of intuitive understanding by referring to the accompanying drawings, and are not absolute limitations on the positional relationship in the actual product.

[0034] A boundary layer turbine structure for natural gas differential pressure power generation, referenced Figures 1-4 It includes a turbine housing 1, a turbine cover plate 2, a motor compartment 3, a motor cover plate 4, and a generator 5. The motor compartment 3 is connected to the turbine cover plate 2.

[0035] The turbine cover plate 2 is bolted to the rear end face of the turbine housing 1, forming a certain space between them. A disc assembly 6 is installed inside the turbine housing 1, and a generator 5 is installed inside the generator compartment 3. The generator 5 and the disc assembly 6 are mounted on the same rotating shaft 7 and are both fixedly connected to the shaft 7. The generator 5 is positioned downstream of the disc assembly 6, allowing the expanded, low-temperature gas to cool the generator 5 and extend its service life. Furthermore, the integrated rotating shaft 7 design of the disc assembly 6 and the generator 5 rotor eliminates dynamic sealing points, reduces long-term wear caused by dynamic seals, and thus prevents natural gas leakage.

[0036] The turbine housing 1 is provided with an air inlet 8, and the motor cover plate 4 is provided with an air outlet 9. The turbine housing 1, the disc assembly 6, the turbine cover plate 2, the motor compartment 3, and the motor cover plate 4 are all provided with air passages for natural gas, and these air passages are interconnected. Furthermore, a mounting cavity is provided inside the turbine housing 1 to accommodate a nozzle 10, located on one side of the disc assembly 6. The turbine cover plate 2 is used to press and fix the nozzle 10. The air inlet end of the nozzle 10 is connected to the air inlet 8 of the turbine housing 1, and the air outlet end is connected to the disc assembly 6.

[0037] Therefore, after natural gas enters the inlet 8, it first passes through the nozzle 10, where it is accelerated to form a high-speed vortex. At the disc assembly 6, the kinetic energy is converted into mechanical energy, driving the disc assembly 6 to rotate. Moreover, the nozzle 10 is detachable, so according to different natural gas flow rates, the nozzle 10 inside the mounting cavity can be replaced by removing the turbine cover plate 2, and then the turbine cover plate 2 is used to fix the nozzle 10 inside the turbine housing 1. Thus, the device supports the rapid replacement of nozzles 10 of different diameters to adapt to different pressure differentials and flow conditions.

[0038] Furthermore, an air inlet 11 is fixed to the outside of the turbine housing 1, and the air inlet 11 is connected to the air inlet 8. An air outlet 12 is fixed to the outside of the motor cover 4, and the air outlet 12 is connected to the air outlet 9.

[0039] In this embodiment, the air inlet 8 and the air outlet 9 are on the same axis. This coaxial design of the air inlet 8 and the air outlet 9 can reduce the difficulty of pipeline modification and greatly save installation costs.

[0040] Furthermore, in order to improve the working stability of the rotating shaft 7, bearings 13 are installed between the rotating shaft 7 and the turbine housing 1, the turbine cover plate 2, and the motor cover plate 4, respectively.

[0041] The motor compartment 3 is equipped with a rectifier 14, which converts the AC power output from the generator 5 into DC power, which can be directly used in voltage regulating station equipment or energy storage systems. Moreover, the integrated design of the rectifier 14 reduces the complexity of external circuits and shrinks the system size by 40%, making it suitable for voltage regulating stations with limited space.

[0042] Correspondingly, a cable seal 15 for sealing the cable is provided inside the motor compartment 3, and a gland 16 for fixing the cable is connected to the outside of the motor cover plate 4. A junction box cover 17 is provided on one side of the motor compartment 3 to facilitate cable maintenance.

[0043] The technical features of the above embodiments can be combined in any way (as long as there is no contradiction in the combination of these technical features). For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described; these embodiments not explicitly written should also be considered to be within the scope of this specification.

Claims

1. A boundary layer turbine structure for differential pressure generation from natural gas, characterized by: Including turbine shell (1), turbine cover plate (2), motor warehouse (3), motor cover plate (4) and generator (5), the motor warehouse (3) is connected with turbine cover plate (2);The turbine shell (1) is installed with round piece group (6), the motor warehouse (3) is installed with generator (5), and the generator (5) and round piece group (6) are installed on same shaft (7); The turbine shell (1) is provided with air inlet (8), the motor cover plate (4) is provided with air outlet (9), the turbine shell (1), round piece group (6), turbine cover plate (2), motor warehouse (3) and motor cover plate (4) are all provided with gas passage for natural gas, and the gas passage is communicated.

2. The boundary layer turbine structure for natural gas pressure differential power generation of claim 1, wherein: The round piece group (6) and generator (5) rotor are all fixedly connected with shaft (7).

3. The boundary layer turbine structure for natural gas pressure differential power generation of claim 1, wherein: The turbine shell (1) is provided with installation cavity inside, the installation cavity is used to accommodate nozzle (10), is in the side of round piece group (6), and the turbine cover plate (2) is used to compress the nozzle (10) fixed;The air inlet end of the nozzle (10) is communicated with the air inlet (8) of the turbine shell (1), and the air outlet end is communicated with the round piece group (6).

4. The boundary layer turbine structure for natural gas pressure differential power generation of claim 1, wherein: The air inlet (8) and air outlet (9) are on the same axis.

5. The boundary layer turbine structure for natural gas pressure differential power generation of claim 1, wherein: The shaft (7) is respectively installed with bearing (13) between turbine shell (1), turbine cover plate (2) and motor cover plate (4).

6. The boundary layer turbine structure for natural gas pressure differential power generation of claim 1, wherein: The motor warehouse (3) is provided with cable sealing element (15) for sealing cable, and the outside of the motor cover plate (4) is connected with gland (16) for fixing cable.

7. The boundary layer turbine structure for natural gas pressure differential power generation of claim 1, wherein: The turbine shell (1) is fixed with air inlet interface (11) outside, and the air inlet interface (11) is butted with air inlet (8);The outside of the motor cover plate (4) is fixed with air outlet interface (12), and the air outlet interface (12) is butted with air outlet (9).

8. The boundary layer turbine structure for natural gas pressure differential power generation of claim 1, wherein: The motor warehouse (3) is installed with rectifier (14).

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