A high-power, low-noise supercritical carbon dioxide generator set
By adopting a dual-axis arrangement and electromagnetic bearing support control design in supercritical carbon dioxide generator sets, the problems of noise and efficiency at high speeds and high power are solved, and more efficient and lower noise generator set operation is achieved.
Patent Information
- Application Number
- CN202411770219.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-04
- Publication Date
- 2025-04-08
AI Technical Summary
At high speed and high power, supercritical carbon dioxide generator sets have problems such as high noise control and difficult to coordinate pneumatic optimization speed and power, and the high losses and vibration disturbances caused by traditional gear boxes and sliding bearings.
Using a biaxial arrangement design, the first compression stage and the second compression stage, the first turbine stage and the second turbine stage of the first unit and the second unit are interconnected, and the electromagnetic bearing support control is used to achieve mutual cancellation of biaxial working disturbances and mutual cancellation of disturbances such as unbalanced forces and gyro forces.
It effectively improves the aerodynamic efficiency and mechanical efficiency of supercritical carbon dioxide generator sets, achieves a larger power level generator set, and significantly reduces operating noise.
Smart Images
Figure CN119778063A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of supercritical carbon dioxide power generation, and further to a high-power and low-noise supercritical carbon dioxide generator set. Background Art
[0002] Supercritical carbon dioxide refers to a carbon dioxide fluid with a temperature exceeding 31°C and a pressure exceeding 7.38MPa. It has the characteristics of density close to that of liquid, viscosity close to that of gas, low corrosiveness, non-toxicity, non-flammability, stability, no damage to the ozone layer, and low cost and availability. The thermal cycle using supercritical carbon dioxide as the circulating working fluid has the characteristics of high efficiency, high power density, wide power coverage, low vibration and noise, and wide adaptability of heat sources. Supercritical carbon dioxide cycle power generation is suitable for heat sources such as nuclear energy, solar energy, fossil fuel combustion, geothermal energy, waste heat, and has broad application prospects in the fields of nuclear energy, solar thermal power generation, industrial waste heat power generation, ship power generation and propulsion systems, and fossil fuel combustion power generation.
[0003] Supercritical carbon dioxide generator set is one of the key equipment in supercritical carbon dioxide system. Supercritical carbon dioxide generator set needs to have the main functions of supercritical carbon dioxide compression and pressurization, high-temperature supercritical carbon dioxide expansion and work, and mechanical work conversion into electrical energy. The supercritical carbon dioxide impeller has a high specific speed, which leads to a high working speed of the unit shaft system, and often needs to work in a flexible shaft system state. Supercritical carbon dioxide has a high density and drastic density changes, which will increase the working disturbance of the rotor and reduce the stable working range of the rotor. In order to improve the efficiency of supercritical carbon dioxide generator sets, it is necessary to simplify the shaft transmission link as much as possible to avoid the high losses caused by the use of gearboxes, sliding bearings, etc. Supercritical carbon dioxide generator sets have a high speed, especially the weight of high-power rotors and large absolute imbalance, which makes it difficult to control the operating noise of the unit. It is difficult to coordinate the pneumatic optimization speed and power of supercritical carbon dioxide generator sets with the motor to achieve optimized speed and power. At present, the gearbox or sacrifice performance is basically used to solve this problem. Supercritical carbon dioxide generator sets are in urgent need of inventing new layouts, structures, and operating methods to improve efficiency, power levels, and reduce operating noise, so as to give full play to the application potential of supercritical carbon dioxide power generation systems. Summary of the invention
[0004] In view of the above technical problems, the object of the present invention is to provide a high-power, low-noise supercritical carbon dioxide generator set, in which the first compression stage and the second compression stage of the first unit and the second unit are interconnected, and the first turbine stage and the second turbine stage are interconnected, so that the first unit and the second unit adopt a dual-axis arrangement, and the power of the single-axis motor is halved, which can effectively improve the aerodynamic efficiency and mechanical efficiency of the supercritical carbon dioxide generator set, and a supercritical carbon dioxide generator set with a larger power level can be realized in engineering; at the same time, the dual-axis working disturbances of the unit cancel each other, greatly reducing the operating noise of the unit.
[0005] In order to achieve the above-mentioned purpose, the present invention provides a high-power, low-noise supercritical carbon dioxide generator set, comprising a first body, a second body, a first unit and a second unit, the first unit is arranged inside the first body and a first compression stage and a first turbine stage are provided at both ends of the first body, the second unit is arranged inside the second body and a second compression stage and a second turbine stage are provided at both ends of the second body, the first compression stage is suitable for connecting to the second compression stage, and the first turbine stage is suitable for connecting to the second turbine stage.
[0006] In some embodiments, the first body and the second body are arranged in parallel, a first installation hole for placing the first unit is provided in the first body, and a second installation hole for placing the second unit is provided in the second body, and the axes of the first installation hole and the second installation hole are located in the same horizontal plane and are parallel to each other.
[0007] In some embodiments, the first compression stage and the second compression stage are respectively located on the same side of the first body and the second body and are connected to each other through a compression cascade air passage;
[0008] The first turbine stage and the second turbine stage are respectively located at the other side of the first engine body and the second engine body and are communicated with each other through a turbine cascade air passage.
[0009] In some embodiments, the first unit and the second unit both include a unit rotor, a unit stator, a unit electromagnetic bearing and a unit seal, the unit stator is arranged on the outside of the unit rotor, the unit rotor is rotatably arranged on the first body and the second body through the unit electromagnetic bearing, and the unit seal is arranged at the end of the unit rotor.
[0010] In some embodiments, the unit rotors of the first unit and the second unit rotate in opposite directions and at the same speed, and the distribution of the rotational inertia and axial rotational inertia of the unit rotors of the first unit and the second unit should be as consistent as possible.
[0011] In some embodiments, the unit rotor includes a rotor body, a sealing movable part, an electromagnetic bearing movable part, a compression centrifugal impeller and a turbine radial impeller, the sealing movable part and the electromagnetic bearing movable part are both arranged on the outside of the rotor body, and the compression centrifugal impeller and the turbine radial impeller are arranged at two ends of the unit rotor.
[0012] In some embodiments, one end of the first body and the second body is also provided with a compressor bearing seat, a compressor casing and a compressor volute in sequence, and the first compression stage and the second compression stage are formed between the compression centrifugal impeller and the compressor volute;
[0013] The other ends of the first body and the second body are also provided with a turbine bearing seat, a turbine casing and a turbine volute in sequence, and the first turbine stage and the second turbine stage are formed between the turbine radial impeller and the turbine volute.
[0014] In some embodiments, the electromagnetic bearing of the unit includes a radial electromagnetic bearing and an axial electromagnetic bearing, and the radial electromagnetic bearing and the axial electromagnetic bearing are both arranged at the supporting position of the unit rotor. The supporting positions of the unit rotors of the first unit and the second unit correspond one to one, and an electromagnetic bearing controller is provided to control the unbalanced force, gyroscopic force and other disturbance forces generated by the rotation of the unit rotors of the first unit and the second unit to offset each other in real time.
[0015] In some embodiments, the electromagnetic bearing of the unit further includes a protective bearing, and the axial displacement of the rotor of the unit at the support position of the electromagnetic bearing of the unit does not exceed 1 / 3 of the gap of the protective bearing.
[0016] In some embodiments, the first body and the second body are integrally configured.
[0017] Compared with the prior art, the high-power, low-noise supercritical carbon dioxide generator set provided by the present invention has at least one of the following beneficial effects:
[0018] 1. The first compression stage and the second compression stage of the first unit and the second unit are interconnected, and the first turbine stage and the second turbine stage are interconnected, so that the first unit and the second unit adopt a dual-shaft arrangement, and the power of the single-shaft motor is halved, which can effectively improve the aerodynamic efficiency and mechanical efficiency of the supercritical carbon dioxide generator set, and a supercritical carbon dioxide generator set with a larger power level can be realized in engineering; at the same time, the dual-shaft working disturbances of the unit cancel each other, which greatly reduces the operating noise of the unit.
[0019] 2. The rotors of the first unit and the second unit rotate at the same speed and in opposite directions. Through the support and control of the electromagnetic bearings of the units, not only can the working excitation of the unit rotors on the units be effectively reduced, but also the unbalanced force, gyroscopic force, etc. of the rotors of the first unit and the second unit can be controlled to offset each other, thereby further reducing the vibration force output of the units.
[0020] 3. The electromagnetic bearings of the unit are supported by multiple electromagnetic bearings, avoiding the use of oil bearings and gearboxes, which can effectively improve the mechanical efficiency; the improvement of the aerodynamic efficiency and mechanical efficiency of the unit effectively improves the overall efficiency of the unit. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] The preferred implementation modes will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of the present invention.
[0022] Figure 1 It is a cross-sectional view of a high-power, low-noise supercritical carbon dioxide generator set;
[0023] Figure 2 This is the overall diagram of a high-power, low-noise supercritical carbon dioxide generator set;
[0024] Figure 3 It is the structure of the first unit;
[0025] Figure 4 is a structural diagram of the first compression stage;
[0026] Figure 5 This is a structural diagram of the first turbine stage.
[0027] Description of Figure Numbers:
[0028] The first body 1, the first mounting channel 10, the first compression stage 11, the compressor bearing seat 111, the compressor casing 112, the compressor volute 113, the first turbine stage 12, the turbine bearing seat 121, the turbine casing 122, the turbine volute 123, the second body 2, the second mounting channel 20, the second compression stage 21, the second turbine stage 22, the first unit 3, the unit rotor 31, the rotor body 311, the sealing movable part 312, the electromagnetic bearing movable part 313, the compression centrifugal impeller 314, the turbine centripetal impeller 315, the unit stator 32, the unit electromagnetic bearing 33, the radial electromagnetic bearing 331, the axial electromagnetic bearing 332, the protective bearing 333, the unit seal 34, the second unit 4, the compression cascade air duct 5, and the turbine cascade air duct 6. DETAILED DESCRIPTION
[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.
[0030] In order to simplify the drawings, only the parts related to the invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically drawn or marked. In this article, "one" not only means "only one", but also means "more than one".
[0031] It should be further understood that the term “and / or” used in the specification and appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.
[0032] In this document, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0033] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance. It should be noted that the above embodiments can be freely combined as needed. The above are only preferred implementations of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention, and these improvements and modifications should also be regarded as the scope of protection of the present invention.
[0034] refer to Figure 1 and Figure 2 The present invention provides a high-power, low-noise supercritical carbon dioxide generator set, comprising a first body 1, a second body 2, a first unit 3 and a second unit 4, the first unit 3 is arranged inside the first body 1 and is provided with a first compression stage 11 and a first turbine stage 12 at both ends of the first body 1, the second unit 4 is arranged inside the second body 2 and is provided with a second compression stage 21 and a second turbine stage 22 at both ends of the second body 2, the first compression stage 11 is suitable for connecting to the second compression stage 21, and the first turbine stage 12 is suitable for connecting to the second turbine stage 22.
[0035] In this embodiment, the first compression stage 11 and the second compression stage 21 of the first unit 3 and the second unit 4 are interconnected, and the first turbine stage 12 and the second turbine stage 22 are interconnected, so that the first unit 3 and the second unit 4 adopt a dual-axis arrangement, and the power of the single-axis motor is halved, which can effectively improve the aerodynamic efficiency and mechanical efficiency of the supercritical carbon dioxide generator set, and a supercritical carbon dioxide generator set with a larger power level can be realized in engineering; at the same time, the dual-axis working disturbances of the unit cancel each other, greatly reducing the operating noise of the unit.
[0036] Specifically, the first body 1 and the second body 2 are the main load-bearing parts of the high-power, low-noise supercritical carbon dioxide turbine generator set. The first body 1 and the second body 2 are arranged on the left and right, the first body 1 is provided with a first unit 3, the second body 2 is provided with a second unit 4, the first unit 3 and the second unit 4 are arranged at intervals on the left and right, the first compression stage 11 at one end of the first unit 3 is connected to the second compression stage 21 at one end of the second unit 4, and the first turbine stage 12 at the other end of the first unit 3 is connected to the second turbine stage 22 at the other end of the second unit 4, so that the double-shaft setting of the first unit 3 and the second unit 4 is arranged in parallel, the first compression stage 11 and the second compression stage 21 are connected to form a two-stage centrifugal compression, the first turbine stage 12 and the second turbine stage 22 are connected to each other to form a two-stage centrifugal turbine, and the single-shaft motor power of the first unit 3 and the second unit 4 is halved, and a larger supercritical carbon dioxide generator set can be realized in engineering. Moreover, the double-shaft setting of the first unit 3 and the second unit 4 also realizes two-stage centrifugal compression and two-stage centrifugal turbine without the impeller penetrating the shaft, which can effectively improve the aerodynamic efficiency. At the same time, through the dual-axis setting of the first unit 3 and the second unit 4, combined with the mutual cancellation control of the dual-axis working force, the external force output of the unit can be effectively reduced, thereby greatly reducing the operating noise of the unit.
[0037] For more details, refer to Figure 4 and Figure 5 , both ends of the first unit 3 and the second unit 4 are provided with compression centrifugal impellers 314 and turbine radial impellers 315. The first body 1 and the second body 2 are also provided with compressor bearing seats 111, compressor casings 112 and compressor volutes 113 in sequence at one end, and the first compression stage 11 and the second compression stage 21 are formed between the compression centrifugal impellers 314 and the compressor volutes 113; the other ends of the first body 1 and the second body 2 are also provided with turbine bearing seats 121, turbine casings 122 and turbine volutes 123 in sequence, and the first turbine stage 12 and the second turbine stage 22 are formed between the turbine radial impellers 315 and the turbine volutes 123. The net output power of the first unit 3 obtained by subtracting the compression power of the first compression stage 11 from the output power of the first turbine stage 12 corresponding to the first unit 3 is equal to the net output power of the second unit 4 obtained by subtracting the compression power of the second compression stage 21 from the output power of the second turbine stage 22 corresponding to the second unit 4. The first body 1 is provided with an installation interface suitable for installing the first unit 3, the compressor bearing seat 111, the compressor casing 112 and the compressor volute 113, and the second body 2 is also provided with an installation interface suitable for installing the second unit 4, the compressor bearing seat 111, the compressor casing 112 and the compressor volute 113. The installation method thereof will not be further elaborated in this application.
[0038] It is worth noting that the present invention solves the problem that the bearing, motor and high-efficiency impeller structure cannot be realized in engineering due to the increase in power of high-power supercritical carbon dioxide turbine generator sets, especially high-power supercritical carbon dioxide turbine generator sets with a power of MW level and above. The rotor 31 of the high-power supercritical carbon dioxide turbine generator set has a large weight, a high critical speed, a strong structure and aerodynamic excitation force, etc., which leads to high operating noise. This will further improve the power level and efficiency of the high-power supercritical carbon dioxide turbine generator set.
[0039] Preferably, the first body 1 and the second body 2 are arranged in parallel, a first mounting hole 10 for placing the first unit 3 is provided in the first body 1, and a second mounting hole 20 for placing the second unit 4 is provided in the second body 2, and the axes of the first mounting hole 10 and the second mounting hole 20 are located in the same horizontal plane and are parallel to each other.
[0040] In this embodiment, the axes of the first mounting hole 10 and the second mounting hole 20 are located on the same horizontal plane and are parallel to each other, so that the rotation axes of the first unit 3 and the second unit 4 are located on the same horizontal plane and are parallel to each other. Specifically, the first compression stage 11 and the second compression stage 21 are respectively located on the same side of the first body 1 and the second body 2 and are interconnected through the compression cascade airway 5; the first turbine stage 12 and the second turbine stage 22 are respectively located on the other side of the first body 1 and the second body 2 and are interconnected through the turbine cascade airway 6. It is worth noting that in this embodiment, the first compression stage 11 and the second compression stage 21 are located on the same side of the first body 1 and the second body 2, and the first turbine stage 12 and the second turbine stage 22 are respectively located on the other side of the first body 1 and the second body 2, and the length of the compression cascade airway 5 and the turbine cascade airway 6 is the smallest, and the working effect is better. The first body 1 and the second body 2 can also be provided with cooling channels, electrical paths, and magnetic paths required for work as needed.
[0041] In a modified embodiment, the first body 1 and the second body 2 are integrated. In this embodiment, the first body 1 and the second body 2 adopt an integrated box structure, which can effectively improve the overall rigidity of the unit, thereby effectively reducing the operating noise of the unit. It is worth noting that the split setting of the first body 1 and the second body 2 is also within the protection scope of this application.
[0042] Further, refer to Figures 3 to 5, the first unit 3 and the second unit 4 both include a unit rotor 31, a unit stator 32, a unit electromagnetic bearing 33 and a unit seal 34. The unit stator 32 is arranged outside the unit rotor 31. The unit rotor 31 is rotatably arranged on the first body 1 and the second body 2 through the unit electromagnetic bearing 33. The unit seal 34 is arranged at the end of the unit rotor 31. The unit rotors 31 of the first unit 3 and the second unit 4 rotate in opposite directions and at the same speed. The rotational inertia and axial rotational inertia distribution of the two unit rotors 31 should be as consistent as possible.
[0043] In this embodiment, the unit rotors 31 of the first unit 3 and the second unit 4 rotate at the same speed and in opposite directions, and the rotational inertia and axial rotational inertia distributions of the two unit rotors 31 should be as consistent as possible, which can not only effectively reduce the working excitation of the unit rotors 31, but also control the mutual offset of the unbalanced force, gyroscopic force, etc. of the unit rotors 31 of the first unit 3 and the second unit 4, thereby further reducing the vibration force output of the unit.
[0044] Specifically, the unit rotor 31 includes a rotor body 311, a sealing movable part 312, an electromagnetic bearing movable part 313, a compression centrifugal impeller 314 and a turbine radial impeller 315. The rotor body 311 is suitable for being coaxially arranged in the first mounting channel 10 of the first body 1 and the second mounting channel 20 of the second body 2. The sealing movable part 312 and the electromagnetic bearing movable part 313 are both arranged on the outside of the rotor body 311. The specific positions are not further limited in this application, which are all prior art in the art. The compression centrifugal impeller 314 and the turbine radial impeller 315 are arranged at both ends of the unit rotor 31. The unit rotors 31 of the first unit 3 and the second unit 4 rotate in opposite directions and at the same speed. The unit rotors 31 of the first unit 3 and the second unit 4 have the same moment of inertia, and the axial moment of inertia distribution of the unit rotor 31 is as consistent as possible.
[0045] Further, refer to Figure 3 The electromagnetic bearing 33 of the unit includes a radial electromagnetic bearing 331 and an axial electromagnetic bearing 332. The radial electromagnetic bearing 331 and the axial electromagnetic bearing 332 are both arranged at the support position of the unit rotor 31. The support positions of the unit rotors 31 of the first unit 3 and the second unit 4 correspond to each other. An electromagnetic bearing controller is arranged to control the unbalanced force, gyroscopic force and other disturbance forces generated by the rotation of the unit rotors 31 of the first unit 3 and the second unit 4 to offset each other in real time. The electromagnetic bearing 33 of the unit also includes a protective bearing 333. The axial displacement of the unit rotor 31 at the support position of the electromagnetic bearing 33 of the unit does not exceed 1 / 3 of the clearance of the protective bearing 333.
[0046] In this embodiment, the electromagnetic bearing 33 of the unit is supported by multiple electromagnetic bearings, which avoids the use of oil bearings and gearboxes and can effectively improve the mechanical efficiency; the improvement of the aerodynamic efficiency and mechanical efficiency of the unit effectively improves the overall efficiency of the unit.
[0047] Specifically, the electromagnetic bearing 33 of the unit mainly plays a supporting and controlling role. Under the support of the electromagnetic bearing 33 of the unit, the first unit 3 and the second unit 4 can adopt a dual-axis arrangement, and the power of the single-axis motor is halved to achieve a balanced working load, and a larger supercritical carbon dioxide generator set can be realized in engineering. Moreover, under the control of the electromagnetic bearing 33 of the unit, not only can the working excitation of the unit by the unit rotor 31 be effectively reduced, but also the mutual offset of the unbalanced force, gyroscopic force, etc. of the unit rotor 31 of the first unit 3 and the second unit 4 can be controlled to further reduce the vibration force output of the unit and reduce noise. The electromagnetic bearing 33 of the unit corresponds to the electromagnetic force position of the unit rotor 31, that is, the supporting position. The electromagnetic bearing 33 of the unit includes a radial electromagnetic bearing 331 and an axial electromagnetic bearing 332. The specific positions of the radial electromagnetic bearing 331 and the axial electromagnetic bearing 332 are not further limited in this application, as long as they can play a supporting role for the unit rotor 31. An electromagnetic bearing controller is set to control the supporting force of each electromagnetic bearing, that is, the axial displacement at the electromagnetic bearing of the unit rotor 31 is required to be within a reasonable range. Therefore, the unit electromagnetic bearing 33 also includes a protective bearing 333. The axial displacement at the electromagnetic bearing of the unit rotor 31 is generally about 1 / 3 of the clearance of the protective bearing 333. The number of radial electromagnetic bearings 331 and protective bearings 333 is not further limited in this application. In this application, there are two radial electromagnetic bearings 331 and protective bearings 333, which are respectively arranged on both sides of the unit rotor 31.
[0048] It is worth noting that the main components of the high-power, low-noise supercritical carbon dioxide turbine generator set of the present invention are axially installed; the unit rotor 31 of the first unit 3 is axially installed in the first installation channel 10 of the first body 1, and the unit rotor 31 of the second unit 4 is axially installed in the second installation channel 20 of the second body 2; the compressor bearing seat 111, the compressor casing 112, and the compressor volute 113 are axially installed in the corresponding parts of the first body 1 and the second body 2 in sequence, and the turbine bearing seat 121, the turbine casing 122, and the turbine volute 123 are axially installed in the corresponding parts of the first body 1 and the second body 2 in sequence; there is no particular installation order for the first unit 3 and the second unit 4.
[0049] It should be noted that the above embodiments can be freely combined as needed. The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.
Claims
1. A high-power, low-noise supercritical carbon dioxide generator set, characterized in that: The invention comprises a first body, a second body, a first unit and a second unit, wherein the first unit is arranged inside the first body and has a first compression stage and a first turbine stage at both ends of the first body, the second unit is arranged inside the second body and has a second compression stage and a second turbine stage at both ends of the second body, the first compression stage is suitable for connecting to the second compression stage, and the first turbine stage is suitable for connecting to the second turbine stage.
2. A high-power, low-noise supercritical carbon dioxide generator set according to claim 1, characterized in that: The first body and the second body are arranged in parallel, a first installation hole for placing the first unit is provided in the first body, and a second installation hole for placing the second unit is provided in the second body, and the axes of the first installation hole and the second installation hole are located in the same horizontal plane and are parallel to each other.
3. A high-power, low-noise supercritical carbon dioxide generator set according to claim 2, characterized in that: The first compression stage and the second compression stage are respectively located on the same side of the first body and the second body and are connected to each other through a compression cascade air passage; The first turbine stage and the second turbine stage are respectively located at the other side of the first engine body and the second engine body and are communicated with each other through a turbine cascade air passage.
4. A high-power, low-noise supercritical carbon dioxide generator set according to claim 1, characterized in that: The first unit and the second unit both include a unit rotor, a unit stator, a unit electromagnetic bearing and a unit seal. The unit stator is arranged on the outside of the unit rotor. The unit rotor is rotatably arranged on the first body and the second body through the unit electromagnetic bearing. The unit seal is arranged at the end of the unit rotor.
5. A high-power, low-noise supercritical carbon dioxide generator set according to claim 4, characterized in that: The unit rotors of the first unit and the second unit rotate in opposite directions and at the same speed, and the distribution of the rotational inertia and axial rotational inertia of the unit rotors of the first unit and the second unit should be as consistent as possible.
6. A high-power, low-noise supercritical carbon dioxide generator set according to claim 5, characterized in that: The unit rotor comprises a rotor body, a sealing movable part, an electromagnetic bearing movable part, a compression centrifugal impeller and a turbine radial impeller. The sealing movable part and the electromagnetic bearing movable part are both arranged on the outside of the rotor body, and the compression centrifugal impeller and the turbine radial impeller are arranged at two ends of the unit rotor.
7. A high-power, low-noise supercritical carbon dioxide generator set according to claim 6, characterized in that: The first body and the second body are also provided with a compressor bearing seat, a compressor casing and a compressor volute in sequence at one end, and the first compression stage and the second compression stage are formed between the compression centrifugal impeller and the compressor volute; The other ends of the first body and the second body are also provided with a turbine bearing seat, a turbine casing and a turbine volute in sequence, and the first turbine stage and the second turbine stage are formed between the turbine radial impeller and the turbine volute.
8. A high-power, low-noise supercritical carbon dioxide generator set according to any one of claims 4 or 5, characterized in that: The electromagnetic bearing of the unit includes a radial electromagnetic bearing and an axial electromagnetic bearing. The radial electromagnetic bearing and the axial electromagnetic bearing are both arranged at the supporting position of the unit rotor. The supporting positions of the unit rotors of the first unit and the second unit correspond one to one. An electromagnetic bearing controller is arranged to control the unbalanced force, gyroscopic force and other disturbance forces generated by the rotation of the unit rotors of the first unit and the second unit to offset each other in real time.
9. A high-power, low-noise supercritical carbon dioxide generator set according to claim 8, characterized in that: The electromagnetic bearing of the unit also includes a protective bearing, and the axial displacement of the rotor of the unit at the support position of the electromagnetic bearing of the unit does not exceed 1 / 3 of the gap of the protective bearing.
10. A high-power, low-noise supercritical carbon dioxide generator set according to claim 1, characterized in that: The first body and the second body are integrally configured.