A non-cooling super-turbine compressor for solar power generation

Abstract

The present invention discloses a non-cooling super-turbine compressor for solar power generation, comprising a high-speed motor, a compressor and a turbine. The compressor is arranged at the protruding end of the high-speed motor rotor and between the high-speed motor and the turbine. The compressor impeller and the turbine wheel of the compressor are coaxially arranged on the high-speed motor rotor through a turbine shaft. The high-speed motor is also provided with an air inlet, an exhaust hole, an air inlet port and an exhaust port. The air inlet and the air inlet are respectively connected to the compressor outlet and are used to introduce supercritical carbon dioxide in the compressor into the high-speed motor. The exhaust hole and the exhaust port are respectively connected to the compressor inlet and are used to merge the supercritical carbon dioxide discharged from the high-speed motor into the compression system to cool and lubricate the high-speed motor. The present invention eliminates the traditional method of connecting the gear box and the motor through a coupling, and has the advantages of compact structure, high efficiency and low noise.

Description

Technical Field

[0001] The invention relates to the technical field of supercritical carbon dioxide power generation systems, and in particular to a non-cooling super-turbine compressor for solar power generation. Background Art

[0002] Since the first industrial revolution, the main way to use thermal energy is to convert thermal energy into mechanical energy through power systems to provide power for human activities. The supercritical carbon dioxide power generation system is a type of power system. It uses supercritical carbon dioxide as a working fluid to convert the heat of the heat source into mechanical energy. The heat source can come from nuclear reactors, solar energy, geothermal energy, industrial waste heat, chemical dye combustion, etc. The excellent properties of supercritical carbon dioxide working fluid make its system have good application prospects and research value. In the current supercritical carbon dioxide power generation system, the compressor and turbine are key components in the entire system. The temperature of the supercritical carbon dioxide gas entering the turbine is very high, reaching 500 to 1000 degrees. However, the maximum operating temperature of the dry gas seal is only 150 degrees. Therefore, the traditional structure has high requirements for cooling the seal, which will also occupy more structural space. The uncooled turbine compressor coaxial unit integrates high-speed permanent magnet motors, gas bearings, two-stage impeller coaxial installation and other high technologies. Due to the high speed, the compressor has a high power density, and the volume is much smaller than that of ordinary compressors of the same power, which can effectively save materials. In addition, it is connected to the prime mover, eliminating the traditional speed-increasing mechanism, with high transmission efficiency and low noise. However, a series of shaft system dynamics and bearing problems caused by high-speed rotating machinery, as well as sealing problems caused by high-pressure working conditions, restrict the development of supercritical carbon dioxide compressors. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a non-cooling super-turbine compressor for solar power generation, which has the advantages of compact structure, high efficiency, low noise and no need for a separate cooling structure.

[0004] The object of the present invention is achieved in that:

[0005] A cooling-free super-turbine compressor for solar power generation comprises a high-speed motor, a compressor and a turbine. The compressor and the turbine are mounted on the same side of the protruding end of the high-speed motor rotor, the compressor is arranged between the high-speed motor and the turbine, a sealing component is provided between the compressor and the high-speed motor to seal the compressor and the high-speed motor, a compressor partition is provided between the high-speed motor and the turbine volute to replace the turbine cooling structure, an air inlet hole, an exhaust hole and an air inlet and an exhaust port are also provided on the high-speed motor, the air inlet hole and the air inlet port are respectively connected to the compressor outlet port to introduce the supercritical carbon dioxide in the compressor into the high-speed motor, the exhaust hole and the exhaust port are respectively connected to the compressor inlet port to merge the supercritical carbon dioxide discharged from the high-speed motor into the compression system to cool and lubricate the high-speed motor.

[0006] Furthermore, the high-speed motor includes a motor housing and a stator, a rotor and an air bearing system installed in the motor housing. The motor housing is provided with a bearing air inlet, a bearing exhaust hole, a stator cooling air inlet and a stator cooling air outlet. The bearing air inlet is connected to the compressor outlet for introducing supercritical carbon dioxide into the air bearing system to lubricate the air bearing system. The bearing exhaust hole is connected to the compressor inlet for collecting the supercritical carbon dioxide discharged from the air bearing system into the compression system. The stator cooling air inlet and the stator cooling air outlet are respectively connected to the stator cooling channel. The stator cooling air inlet is connected to the compressor outlet for introducing supercritical carbon dioxide into the stator cooling channel to cool the stator. The stator cooling air outlet is connected to the compressor inlet for collecting the supercritical carbon dioxide in the stator cooling channel into the compression system.

[0007] Furthermore, an air storage tank and a pressure control valve are connected in series between the air outlet of the compressor and the air inlet of the bearing. The air storage tank is used to store supercritical carbon dioxide, and the pressure control valve is used to control the pressure of the supercritical carbon dioxide introduced into the air bearing system.

[0008] Furthermore, a suction pump is connected between the bearing exhaust hole and the air inlet of the compressor to introduce the low-pressure supercritical carbon dioxide discharged from the air bearing system into the compression system.

[0009] Furthermore, the stator comprises a stator core and a stator coil, and the stator cooling channel is arranged in the stator core.

[0010] Furthermore, the air bearing system includes a radial bearing, a radial-thrust combined bearing and a thrust bearing, the radial bearing is located at one end of the rotor, the radial-thrust combined bearing and the thrust bearing are located at the other end of the rotor, and the thrust bearing is located on the inner side of the radial-thrust combined bearing.

[0011] Further, the bearing air inlet hole includes a radial bearing air inlet hole, a radial-thrust combined bearing air inlet hole and a thrust bearing air inlet hole, and the bearing exhaust hole includes a radial bearing exhaust hole, a radial-thrust combined bearing exhaust hole and a thrust bearing exhaust hole.

[0012] Furthermore, the compressor impeller of the compressor and the turbine wheel of the turbine are simultaneously fixedly mounted on the shaft end of the high-speed motor rotor via a turbine shaft.

[0013] Due to the adoption of the above technical solution, the present invention has the following beneficial effects:

[0014] The compressor and turbine integrated structure proposed in the present invention has a high-speed motor, a compressor impeller, a turbine and a sealing structure that are coaxially connected, thereby eliminating the traditional compressor speed-increasing gearbox and turbine speed-reducing gearbox, and integrating the original two independent devices, the compressor and the turbine, into one, which has the advantages of compact and simple structure, high power density, low power loss, etc. The compressor is arranged between the motor and the turbine, and the compressor partition (compressor sleeve) is used to replace the special turbine cooling structure, eliminating the complex turbine cooling mechanism, and by introducing the bearing gas exhaust into the air intake airflow of the compressor, the entire unit basically achieves zero leakage. At the same time, the compressor of the present invention has no oil and air in the entire experimental prototype, and is suitable for the compression of micro-supercritical carbon dioxide. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0016] Figure 2 This is a schematic diagram of the inlet and outlet structures of the compressor and turbine in the present invention;

[0017] Figure 3 It is the flow path diagram of the supercritical carbon dioxide of the present invention.

[0018] Reference numerals

[0019] 1. High-speed motor, 101. Motor housing, 102. Stator, 103. Rotor, 104. Radial bearing, 105. Radial-thrust joint bearing, 106. Thrust bearing, 107. Radial bearing air inlet, 108. Radial bearing exhaust hole, 109. Radial-thrust joint bearing air inlet, 110. Radial-thrust joint bearing exhaust hole, 111. Thrust bearing air inlet, 112. Thrust bearing exhaust hole, 113. Stator cooling air inlet, 114. Stator cooling air outlet, 1021. Stator core, 1022. Stator coil, 1023. Stator cooling channel,

[0020] 2. Sealing components, 3. Compressor, 301. Compressor housing, 302. Compressor impeller, 303. Compressor air inlet, 304. Compressor air outlet,

[0021] 4. turbine, 401. volute, 402. turbine shaft, 403. turbine inlet, 404. turbine outlet,

[0022] 5. Compressor partition. DETAILED DESCRIPTION

[0023] like Figures 1 to 3 As shown, a non-cooling super-turbine compressor for solar power generation includes a high-speed motor 1, a compressor 3 and a turbine 4. The high-speed motor uses supercritical carbon dioxide as a lubricating medium. The compressor 3 and the turbine 4 are installed in sequence on the same side of the high-speed motor rotor shaft end. The compressor 3 is arranged between the high-speed motor 1 and the turbine 4. A sealing component 2 is provided between the compressor 3 and the high-speed motor 1 to seal the compressor and the high-speed motor. A compressor partition 5 is provided between the high-speed motor 1 and the turbine volute 401 to replace the turbine cooling structure. Supercritical carbon dioxide enters from the compressor inlet 303, and the high-speed motor 1 drives the compressor impeller to compress the supercritical carbon dioxide to do work. The supercritical carbon dioxide then enters the heat exchanger from the compressor outlet 304, enters the turbine inlet 403 after being heated by the heat exchanger, and is discharged from the turbine outlet 404 after doing work and generating electricity.

[0024] The compressor impeller 301 and the turbine wheel of the compressor are coaxially arranged on the high-speed motor rotor 103. The high-speed motor 1 is also provided with an air inlet, an exhaust hole, an air inlet port and an exhaust port. The air inlet and the air inlet are respectively connected to the compressor outlet 304, so as to introduce the supercritical carbon dioxide in the compressor 3 into the high-speed motor 1. The exhaust hole and the exhaust port are respectively connected to the compressor air inlet 303, so as to merge the supercritical carbon dioxide discharged from the high-speed motor 1 into the compression system to cool and lubricate the high-speed motor 1.

[0025] like Figure 1 As shown, in this embodiment, the high-speed motor 1 includes a motor housing 101 and a stator 102, a rotor 103 and an air bearing system installed in the motor housing. The motor housing 101 is provided with a bearing air inlet, a bearing exhaust hole, a stator cooling air inlet 113 and a stator cooling air outlet 114. The bearing air inlet is connected to the compressor outlet 304 for introducing supercritical carbon dioxide into the air bearing system to lubricate the air bearing system. The bearing exhaust hole is connected to the compressor air inlet 303 for introducing supercritical carbon dioxide into the air bearing system to lubricate the air bearing system. The supercritical carbon dioxide discharged from the air bearing system is merged into the compression system. The stator cooling air inlet 113 and the stator cooling air outlet 114 are respectively connected to the stator cooling channel 1023. The stator cooling air inlet 113 is connected to the compressor outlet 304, so as to introduce the supercritical carbon dioxide into the stator cooling channel 1023 to cool the stator 102; the stator cooling air outlet 114 is connected to the compressor inlet 303, so as to merge the supercritical carbon dioxide in the stator cooling channel 1023 into the compression system.

[0026] The stator 102 includes a stator core 1021 and a stator coil 1022 . The stator cooling channel 1023 is disposed in the stator core 1021 .

[0027] The air bearing system includes a radial bearing 104, a radial-thrust combined bearing 105 and a thrust bearing 106. The radial bearing 104 is located at one end of the rotor 103, the radial-thrust combined bearing 105 and the thrust bearing 106 are located at the other end of the rotor 103, and the thrust bearing 106 is located on the inner side of the radial-thrust combined bearing 105, so that the high-speed motor rotor can run stably and at high speed.

[0028] like Figure 1 As shown, the bearing air inlet holes on the motor housing 101 include radial bearing air inlet holes 107, radial-thrust combined bearing air inlet holes 109 and thrust bearing air inlet holes 111, and the bearing exhaust holes include radial bearing exhaust holes 108, radial-thrust combined bearing exhaust holes 110 and thrust bearing exhaust holes 112.

[0029] Figure 2 The inlet and outlet directions provided on the compressor housing 301 and the turbine volute 401 are shown.

[0030] like Figure 1 As shown, in this embodiment, an air storage tank and a pressure control valve are connected in series between the compressor air outlet 304 and the bearing air inlet hole. The air storage tank is used to store supercritical carbon dioxide, and the pressure control valve is used to control the pressure of the supercritical carbon dioxide introduced into the air bearing system.

[0031] In this embodiment, a suction pump is connected between the bearing exhaust hole and the compressor air inlet 303 to collect the low-pressure supercritical carbon dioxide discharged from the air bearing system into the compression system.

[0032] The gas storage tank, pressure control valve and suction pump are the features of the present invention to achieve better technical effects. Figure 1 These parts are not shown.

[0033] In this embodiment, the compressor impeller 301 and the turbine are simultaneously installed on the shaft end of the high-speed motor rotor 103 through the turbine shaft 402, so that the compressor impeller and the turbine are coaxially connected to the protruding end of the rotor of the high-speed motor, eliminating the traditional method of connecting the gear box and the motor through a coupling. It has the advantages of compact and simple structure, high power density, and no need to design a cooling structure separately.

[0034] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention 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 invention.

Claims

1. A non-cooling super-turbine compressor for solar power generation, characterized in that: It comprises a high-speed motor, a compressor and a turbine, wherein the compressor and the turbine are installed on the same side of the protruding end of the high-speed motor rotor, the compressor is arranged between the high-speed motor and the turbine, a sealing component is provided between the compressor and the high-speed motor to seal the compressor and the high-speed motor, a compressor partition is provided between the high-speed motor and the turbine volute to replace the turbine cooling structure, the high-speed motor is also provided with an air inlet, an exhaust hole and an air inlet and an exhaust port, the air inlet and the air inlet are respectively connected to the compressor outlet to introduce the supercritical carbon dioxide in the compressor into the high-speed motor, the exhaust hole and the exhaust port are respectively connected to the compressor inlet to merge the supercritical carbon dioxide discharged from the high-speed motor into the compression system to cool and lubricate the high-speed motor; The high-speed motor includes a motor housing and a stator, a rotor and an air bearing system installed in the motor housing. The motor housing is provided with a bearing air inlet, a bearing exhaust hole, a stator cooling air inlet and a stator cooling air outlet. The bearing air inlet is connected to the compressor outlet and is used to introduce supercritical carbon dioxide into the air bearing system to lubricate the air bearing system. The bearing exhaust hole is connected to the compressor inlet and is used to merge the supercritical carbon dioxide discharged from the air bearing system into the compression system. The stator cooling air inlet and the stator cooling air outlet are respectively connected to the stator cooling channel. The stator cooling air inlet is connected to the compressor outlet and is used to introduce supercritical carbon dioxide into the stator cooling channel to cool the stator. The stator cooling air outlet is connected to the compressor inlet and is used to merge the supercritical carbon dioxide in the stator cooling channel into the compression system.

2. The uncooled super-turbine compressor for solar power generation according to claim 1, characterized in that: An air storage tank and a pressure control valve are connected in series between the air outlet of the compressor and the air inlet of the bearing. The air storage tank is used to store supercritical carbon dioxide, and the pressure control valve is used to control the pressure of the supercritical carbon dioxide introduced into the air bearing system.

3. The uncooled super-turbine compressor for solar power generation according to claim 1, characterized in that: A suction pump is connected between the bearing exhaust hole and the air inlet of the compressor to collect the low-pressure supercritical carbon dioxide discharged from the air bearing system into the compression system.

4. The uncooled super-turbine compressor for solar power generation according to claim 1, characterized in that: The stator comprises a stator core and a stator coil, and a stator cooling channel is arranged in the stator core.

5. The uncooled super-turbine compressor for solar power generation according to claim 1, characterized in that: The air bearing system comprises a radial bearing, a radial-thrust combined bearing and a thrust bearing, wherein the radial bearing is located at one end of the rotor, the radial-thrust combined bearing and the thrust bearing are located at the other end of the rotor, and the thrust bearing is located inside the radial-thrust combined bearing.

6. The uncooled super-turbine compressor for solar power generation according to claim 5, characterized in that: The bearing air inlet holes include radial bearing air inlet holes, radial-thrust combined bearing air inlet holes and thrust bearing air inlet holes, and the bearing exhaust holes include radial bearing exhaust holes, radial-thrust combined bearing exhaust holes and thrust bearing exhaust holes.

7. The uncooled super-turbine compressor for solar power generation according to claim 1, characterized in that: The compressor impeller of the compressor and the turbine wheel of the turbine are simultaneously fixedly mounted on the rotor shaft end of the high-speed motor through the turbine shaft.

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