CN213088085U

CN213088085U - Supercritical carbon dioxide compression and expansion integrated machine and power generation system

Info

Publication number: CN213088085U
Application number: CN202021522292.2U
Authority: CN
Inventors: 张胜龙; 赵磊; 张少锋; 陈健; 魏掌来
Original assignee: Shanghai Chaolin Power Technology Co ltd
Current assignee: Shanghai Chaolin Power Technology Co ltd
Priority date: 2020-07-28
Filing date: 2020-07-28
Publication date: 2021-04-30
Anticipated expiration: 2030-07-28

Abstract

The utility model provides a supercritical carbon dioxide compression and expansion all-in-one and power generation system. The utility model provides a supercritical carbon dioxide compression and expansion integrated machine, which comprises a casing, a main shaft, a generator component and a plurality of bearings, wherein the main shaft is arranged in the casing; the plurality of bearings include a first bearing having a damper, the main shaft and the inner side of the housing forming an accommodating space, the first bearing being disposed in the accommodating space and supporting the main shaft in a radial direction of the main shaft. The utility model discloses a supercritical carbon dioxide compression expansion all-in-one can ensure the normal function of power generation system.

Description

Supercritical carbon dioxide compression and expansion integrated machine and power generation system

Technical Field

The application relates to the technical field of supercritical carbon dioxide power generation, in particular to a supercritical carbon dioxide compression and expansion integrated machine and a power generation system.

Background

The supercritical carbon dioxide cycle power generation system is a brayton cycle system using carbon dioxide in a supercritical state as a working medium, and therefore, is also called a supercritical carbon dioxide (chemical formula: carbon dioxide) brayton cycle power generation system. The supercritical carbon dioxide cycle power generation system has the advantages of high efficiency, small system volume, low noise, environmental protection, economy and the like, is regarded as one of the main development and development directions of future power generation, and has good application prospects in various fields.

In the prior art, a main system of a supercritical carbon dioxide simple brayton cycle power generation system and a supercritical carbon dioxide simple regenerative brayton cycle power generation system mainly comprises a compressor, an expander, a motor, a generator, a gear box, a transmission shaft, a bearing and the like, wherein the bearing is installed between the transmission shaft and a casing of the main machine, the bearing adopts a common sliding bearing, and the common sliding bearing provides support for the compressor and the expander.

Because the rotor dynamic characteristics of the common sliding bearing are poor, the transmission shaft is easy to vibrate too much when the critical rotating speed is exceeded, and the normal operation of a power generation system is influenced.

SUMMERY OF THE UTILITY MODEL

The utility model provides a supercritical carbon dioxide compression expansion all-in-one and power generation system can ensure the normal function of power generation system.

On one hand, the utility model provides a supercritical carbon dioxide compression and expansion all-in-one machine, which comprises a casing, a main shaft, a generator component and a plurality of bearings, wherein the main shaft is arranged in the casing, the generator component comprises a stator and a rotor, the rotor is fixed on the main shaft, the main shaft can rotate relative to the stator, and the bearings are arranged between the main shaft and the casing;

the plurality of bearings include a first bearing having a damper, the main shaft and the inner side of the housing forming an accommodating space, the first bearing being disposed in the accommodating space and supporting the main shaft in a radial direction of the main shaft.

In some embodiments, the first bearing is a plain bearing and the first bearing has an oil film damper.

In some embodiments, the rated operating speed of the generator assembly is greater than or equal to 10000 r/min.

In some embodiments, the utility model provides a supercritical carbon dioxide compression and expansion all-in-one still includes compressor and expander, and compressor and expander set up the tip at the main shaft relatively.

In some embodiments, the first bearings are two and disposed on two sides of the generator assembly along the axial direction of the main shaft, the accommodating space includes a first space and a second space respectively disposed on two sides of the generator assembly, the first space is located between the generator assembly and the expander, the second space is located between the generator assembly and the compressor, and the two first bearings are disposed in the first space and the second space respectively.

In some embodiments, the plurality of bearings further includes a second bearing, the second bearing being a thrust bearing, the second bearing being disposed within the first space.

In some embodiments, the number of second bearings is two, and both second bearings are disposed on the same side of the first bearing.

In some embodiments, the casing has a compressor inlet, a compressor outlet, an expander inlet, and an expander outlet, the compressor outlet communicating with the expander inlet;

supercritical carbon dioxide enters the compressor through the compressor inlet and then flows out of the compressor through the compressor outlet, supercritical carbon dioxide flowing out of the compressor enters the expander through the expander inlet and then flows out of the expander through the expander outlet, and supercritical carbon dioxide flowing out of the expander enters the compressor through the compressor inlet.

In some embodiments, the utility model provides a supercritical carbon dioxide compression and expansion all-in-one still includes seal assembly, seal assembly includes independent first sealing member and the second sealing member that sets up, and first sealing member and second sealing member all set up on the main shaft, and just first sealing member sets up between the second bearing that is located first space and the expander impeller, and the second sealing member sets up between the first bearing that is located the second space and the compressor impeller.

On the other hand, the utility model provides a power generation system, including foretell supercritical carbon dioxide compression expansion all-in-one.

The utility model provides a supercritical carbon dioxide compression and expansion all-in-one machine and power generation system, wherein, supercritical carbon dioxide compression and expansion all-in-one machine includes casing, main shaft, generator subassembly and a plurality of bearings, and the main shaft sets up in the casing, and the generator subassembly includes stator and rotor, and the rotor is fixed on the main shaft, and the main shaft can rotate relative to the stator, and the bearing sets up between main shaft and casing; the plurality of bearings include a first bearing having a damper, the main shaft and the inner side of the housing forming an accommodating space, the first bearing being disposed in the accommodating space and supporting the main shaft in a radial direction of the main shaft. The utility model provides a supercritical carbon dioxide compression expansion all-in-one can ensure the normal function of power generation system.

The structure of the present invention and other objects and advantages thereof will be more clearly understood from the following description of the preferred embodiments taken in conjunction with the accompanying drawings.

Drawings

In order to more clearly illustrate the technical solutions in the present application or the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

FIG. 1 is a schematic structural diagram of a conventional simple regenerative Brayton cycle power generation system using supercritical carbon dioxide;

FIG. 2 is a schematic structural diagram of a main engine system in a conventional supercritical carbon dioxide simple regenerative Brayton cycle power generation system;

fig. 3 is a schematic structural diagram of an integrated supercritical carbon dioxide compression and expansion machine provided by an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a power generation system according to an embodiment of the present invention.

Description of reference numerals:

1. 200-a heat source; 2. 70-an expander; 701-an expander impeller; 3, a generator; 4. 60-a compressor; 601-a compressor wheel; 5. 300-a cooler; 6. 100-a heat regenerator; 7-a gearbox; 71-a gear; 8-an electric motor; 9. 50-a bearing; 10-a lube oil supply system; 20-a housing; 30-a main shaft; 40-a generator assembly; 401-a stator; 402-a rotor; 501-a first bearing; 502-a second bearing; 80-a seal assembly; 801-a first seal; 802 — second seal.

Detailed Description

To make the purpose, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be clearly and completely described below with reference to the drawings in the present application, and it is obvious that the described embodiments are some, but not all embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The brayton cycle is a typical thermodynamic cycle which is firstly proposed by brayton, an american scientist and takes gas as a working medium. The simple Brayton cycle gas working medium realizes high-efficiency energy conversion through four processes of isentropic compression, isobaric heat absorption, isentropic expansion and isobaric cooling. When the working medium is in a supercritical state, the change of the phase state of the working medium is avoided, the consumption of compression work is reduced, and the cycle efficiency of the working medium can be greatly improved.

Any one substance exists in three phases: solid, liquid and gaseous states, and at a certain temperature and pressure, the phase state of a substance changes, thereby exhibiting different phase states. The point at which the two phases of the gas and the liquid are in an equilibrium state is called a critical point, the temperature and the pressure corresponding to the critical point are respectively called a critical temperature and a critical pressure, the state of the substance at the critical point is called a critical state, and if the temperature and the pressure of the substance in the critical state are continuously increased, the substance enters a supercritical state when the temperature and the pressure are increased to exceed the critical temperature and the critical pressure.

When the temperature and pressure of the carbon dioxide reach the critical temperature of 31.1 ℃ and the critical pressure of 7.38MPa respectively, the carbon dioxide is in a supercritical state, namely supercritical carbon dioxide. The supercritical carbon dioxide is in a state between liquid and gas, has special physical characteristics of small gas viscosity and large liquid density, has the typical advantages of good fluidity, high heat transfer efficiency, small compressibility and the like, and has the advantages of good engineering realizability, high circulation efficiency, small occupied area of components and systems, good economic benefit and the like by using the supercritical carbon dioxide as a circulating working medium, so the supercritical carbon dioxide is considered to be one of Brayton circulating working media with development prospect.

A supercritical carbon dioxide Brayton cycle power generation system is a closed cycle power generation system taking supercritical carbon dioxide as a cycle working medium. Fig. 1 is a schematic structural diagram of a conventional supercritical carbon dioxide simple regenerative brayton cycle power generation system. As shown in fig. 1, the supercritical carbon dioxide brayton cycle power generation system mainly comprises core components such as a heat source 1, an expander 2, a generator 3, a compressor 4, a cooler 5, a heat regenerator 6 and the like, wherein in the cycle process, the working medium is always in a supercritical state, after the low-temperature and low-pressure supercritical carbon dioxide working medium is boosted by the compressor 4, the waste gas exhausted from the gas turbine is heat exchanged in the heat regenerator 6 to realize preheating, after the waste gas is preheated to a certain temperature, the gas is further heated by a heat source 1 (industrial waste heat, nuclear reactor, fossil fuel or solar energy and the like), then enters an expander 2 to expand and do work to drive a generator 3 to generate power, exhaust gas which does work is discharged from a cylinder and enters a heat regenerator 6 to exchange heat with a low-temperature high-pressure working medium discharged from a compressor 4, the purpose of precooling is achieved, the precooled working medium enters a cooler 5 to be further cooled, and the cooled supercritical carbon dioxide enters the compressor 4 again to be circulated for the next time. The portion shown in the dotted line frame in fig. 1 refers to a mechanical system constituted by a rotating machine, i.e., a host system.

In order to solve the problems of multiple rotating devices, complex systems and multiple fault points of a main system, a method for improving the main system through a gear box 7 is provided in the prior art, fig. 2 is a structural schematic diagram of the main system in the existing supercritical carbon dioxide simple regenerative brayton cycle power generation system, as shown in fig. 2, the gear box 7 includes two gears 71, each gear has a shaft corresponding to two shaft extension ends, one shaft is used for fixing a compressor 4 and an expander 2, the other shaft is used for fixing a motor 8 and a generator 3, and corresponding bearings 9 are respectively arranged on two ends of the two shafts as supports.

In conclusion, the existing supercritical carbon dioxide simple regenerative Brayton cycle power generation system has the following defects:

in the conventional simple regenerative Brayton cycle supercritical carbon dioxide power generation system, a bearing adopted in a host system is a common bearing, the dynamic characteristic of a rotor is poor, and the transmission shaft is easy to vibrate too much at the supercritical rotation speed, so that the normal operation of the power generation system is influenced.

In the existing simple regenerative Brayton cycle power generation system of supercritical carbon dioxide, a host system comprises four rotating devices of a compressor, an expander, a motor and a generator, and auxiliary devices and systems such as a gear box, an oil lubricating bearing, a lubricating oil supply system and the like, so that the host system is large in size and low in working efficiency.

Therefore, the utility model provides a supercritical carbon dioxide compression expansion all-in-one and power generation system can overcome above-mentioned defect.

The present invention will be described with reference to the accompanying drawings and specific embodiments.

Fig. 3 is a schematic structural diagram of the supercritical carbon dioxide compression and expansion integrated machine provided by the embodiment of the present invention.

As shown in fig. 3, an embodiment of the present invention provides a supercritical carbon dioxide compression and expansion all-in-one machine, which includes a casing 20, a main shaft 30, a generator assembly 40 and a plurality of bearings 50, wherein the main shaft 30 is disposed in the casing 20, the generator assembly 40 includes a stator 401 and a rotor 402, the rotor 402 is fixed on the main shaft 30, the main shaft 30 can rotate relative to the stator 401, and the bearings 50 are disposed between the main shaft 30 and the casing 20; the plurality of bearings 50 includes a first bearing 501, the first bearing 501 has a damper, the main shaft 30 forms an accommodating space with the inside of the housing 20, and the first bearing 501 is disposed in the accommodating space and supports the main shaft 30 in a radial direction of the main shaft 30.

The generator assembly 40 is a motor device capable of converting electrical energy and mechanical energy, and as can be seen from the reversible principle of the motor, the same generator assembly 40 can operate as both a generator and a motor. Specifically, when the generator assembly 40 operates with positive torque, it is equivalent to a motor and is capable of converting electrical energy into mechanical energy, and when the generator assembly 40 operates with negative torque, it is equivalent to a generator and is capable of converting mechanical energy into electrical energy; the bearing 50 is one of important parts in the supercritical carbon dioxide compression and expansion all-in-one machine, and is mainly used for supporting and guiding the rotation of the main shaft 30 so as to reduce the friction coefficient of the main shaft 30 in the rotation process and ensure the rotation precision of the main shaft 30.

In this embodiment, the first bearing 501 has a damper, so that the damping generated by the first bearing 501 during the rotation of the main shaft 30 can be increased, and the vibration generated in the radial direction of the main shaft 30 can be reduced.

In the supercritical carbon dioxide compression and expansion all-in-one machine provided by the embodiment, the first bearing 501 is provided with the damper, so that the damping of the first bearing 501 can be increased, and when the generator assembly 40 operates, the vibration generated by the main shaft 30 due to the operation of the generator assembly 40 can be reduced, so that the stability of the supercritical carbon dioxide compression and expansion all-in-one machine provided by the embodiment can be improved.

In a specific embodiment of the present embodiment, the first bearing 501 is a sliding bearing, and the first bearing 501 has an oil film damper. By providing the oil film damper in the first bearing 501 in this way, the damping of the first bearing 501 can be increased, and the first bearing 501 can reduce the vibration generated in the radial direction of the main shaft 30.

Specifically, the rated operating speed of the generator assembly 40 is greater than or equal to 10000 r/min. Thus, in the process of high-speed operation of the generator assembly 40, when the main shaft 30 vibrates due to high-speed operation of the generator assembly 40, the first bearing 501 can provide damping and reduce the vibration of the main shaft 30, so that the stability of the supercritical carbon dioxide compression and expansion all-in-one machine provided by the embodiment can be improved.

The supercritical carbon dioxide compression and expansion all-in-one machine provided by the embodiment further comprises a compressor 60 and an expander 70, wherein the compressor 60 and the expander 70 are oppositely arranged at the end part of the main shaft 30.

Specifically, when the supercritical carbon dioxide compression and expansion integrated machine provided in this embodiment works, the compressor 60 is configured to compress a low-pressure circulating working medium (supercritical carbon dioxide) entering the compressor to obtain a high-pressure circulating working medium. The expander 70 is configured to expand the high-temperature and high-pressure circulating medium entering the expander, and to apply work to the outside by using heat energy of the circulating medium.

In the present embodiment, the compressor 60 includes a compressor impeller 601 and at least a portion of the casing 20, the compressor impeller 601 being disposed on one end of the main shaft 30; the expander 70 includes an expander impeller 701 and at least a part of the casing 20, the expander impeller 701 being provided on the other end of the main shaft 30.

In this way, in terms of spatial position, the generator assembly 40 is located between the compressor impeller 601 and the expander impeller 701, and the generator assembly 40, the compressor impeller 601 and the expander impeller 701 share the main shaft 30, so that the compactness of the overall structure of the supercritical carbon dioxide compression-expansion all-in-one machine provided by the embodiment can be improved.

In this embodiment, when the supercritical carbon dioxide compression and expansion integrated machine is started, the generator assembly 40 works in a motor mode, and the motor generator is used as a power source for the compressor impeller 601 and the expander impeller 701 to drive the compressor impeller 601 and the expander impeller 701 to rotate; when the output work of the expander impeller 701 is greater than the consumed work of the supercritical carbon dioxide compression and expansion all-in-one machine, the expander impeller 701 rotates to drive the generator assembly 40 and the compressor impeller 601 to rotate, the generator assembly 40 is switched to a generator mode, and power generation is achieved.

In a specific implementation manner of this embodiment, the two first bearings 501 are respectively disposed on two sides of the generator assembly 40 along the axial direction of the main shaft 30, the accommodating space includes a first space and a second space respectively disposed on two sides of the generator assembly 40, the first space is located between the generator assembly 40 and the expander 70, the second space is located between the generator assembly 40 and the compressor 60, and the two first bearings 501 are respectively disposed in the first space and the second space.

In this way, the first bearing 501 is disposed on the main shaft 30 in two parts, one part is located on the side of the generator assembly 40 close to the compressor 60, and the other part is located on the side of the generator assembly 40 close to the expander 70, so that the main shaft 30 can be well supported, and the main shaft 30 can be ensured to rotate in a certain space without radial deviation.

In this embodiment, the plurality of bearings 50 further includes a second bearing 502, the second bearing 502 is a thrust bearing, and the second bearing 502 is disposed in the first space.

Thus, the thrust bearing 503 is provided to prevent the main shaft 30 from being displaced in the axial direction thereof.

As an alternative embodiment, the number of the second bearings 502 is two, and the two second bearings 502 are disposed on the same side of the first bearing 501.

In this way, the two second bearings 502 are located in the first space, that is, the two second bearings 502 are located on the side of the generator assembly 40 close to the expander 70, and since the rotation of the expander impeller 701 is the active rotation, the two second bearings 502 can effectively prevent the main shaft 30 from shifting in the axial direction during the rotation of the expander impeller 701.

In the present embodiment, the casing 20 has a compressor inlet, a compressor outlet, an expander inlet and an expander outlet, the compressor outlet is communicated with the expander inlet; the supercritical carbon dioxide enters the compressor 60 through the compressor inlet and then flows out of the compressor 60 through the compressor outlet, the supercritical carbon dioxide flowing out of the compressor enters the expander 70 through the expander inlet and then flows out of the expander 70 through the expander outlet, and the supercritical carbon dioxide flowing out of the expander 70 enters the compressor 60 through the compressor inlet.

Thus, a circulation system can be formed to allow the working medium to flow in or out. Specifically, a compressor inlet and a compressor outlet may be reserved on the casing 20 around the compressor impeller 601, and an expander inlet and an expander outlet may be reserved on the casing 20 around the expander impeller 701.

In this embodiment, since the compressor impeller 601 and the expander impeller 701 share the main shaft 30, it can be seen from the foregoing analysis that, when the supercritical carbon dioxide compression and expansion integrated machine works, the requirements of the compressor 60 and the expander 70 on the circulating working medium are completely different, and in order to ensure the effectiveness and the safety of the work, the main shaft 30 needs to be provided with seals for the compressor 60 and the expander 70, respectively. Specifically, the supercritical carbon dioxide compression and expansion all-in-one machine provided by this embodiment further includes a seal assembly 80, where the seal assembly 80 includes a first seal 801 and a second seal 802 that are independently arranged, the first seal 801 and the second seal 802 are both arranged on the main shaft 30, the first seal 801 is arranged between the second bearing 802 located in the first space and the expander impeller 701, and the second seal 802 is arranged between the first bearing 801 located in the second space and the compressor impeller 601.

In this way, the first sealing element 801 is disposed on the main shaft 30 to perform a sealing function on the expander 70, and the second sealing element 802 is disposed on the main shaft 30 to perform a sealing function on the compressor 60, so that the working fluid entering the compressor 60 and the expander 70 can be prevented from leaking outwards.

The sealing assembly 80 serves to prevent the supercritical carbon dioxide from leaking out of the compressor 60 or the expander 70. In a specific design, any one of the following may be selected as the first sealing element 801 or the second sealing element 802: a tie seal, a honeycomb seal, a carbon ring seal, a brush seal, a side tooth seal, a dry gas seal, a floating ring seal, a abradable seal.

The types of the first sealing member 801 and the second sealing member 802 may be the same or different. In addition, in order to improve the sealing effect, several sealing combinations may be used, and specifically, which sealing is used is determined according to actual needs and situations, which is not limited herein.

The embodiment of the application adopts an integrated design, and the main shaft 30, the compressor impeller 601, the expander impeller 701, the generator assembly 40, the bearing 50, the first sealing element 801 and the second sealing element 802 are all arranged in the casing 20, namely all the parts share the casing 20, so that the compactness of the overall structure of the supercritical carbon dioxide compression and expansion all-in-one machine provided by the embodiment can be improved.

The supercritical carbon dioxide compression and expansion integrated machine provided by the embodiment comprises a machine shell, a main shaft, a generator assembly and a plurality of bearings, wherein the main shaft is arranged in the machine shell, the generator assembly comprises a stator and a rotor, the rotor is fixed on the main shaft, the main shaft can rotate relative to the stator, and the bearings are arranged between the main shaft and the machine shell; the plurality of bearings include a first bearing having a damper, the main shaft and the inner side of the housing forming an accommodating space, the first bearing being disposed in the accommodating space and supporting the main shaft in a radial direction of the main shaft. The supercritical carbon dioxide compression and expansion all-in-one machine that this embodiment provided is through setting up the first bearing that has the attenuator to at the rotatory in-process damping of main shaft increase first bearing, thereby can reduce the vibration that the main shaft took place in footpath, promote the stability of supercritical carbon dioxide compression and expansion all-in-one machine during operation.

Fig. 4 is a schematic structural diagram of a power generation system provided in the embodiment of the present invention, as shown in fig. 4, the present embodiment further provides a power generation system, which includes the supercritical carbon dioxide compression and expansion all-in-one machine in the above embodiment.

It should be noted that the structure and the operation principle of the supercritical carbon dioxide compression and expansion integrated machine have been described in detail in the above embodiments, and are not described herein again.

For example, taking a simple regenerative brayton cycle power generation system using supercritical carbon dioxide as an example, the power generation system provided by the present embodiment further includes a regenerator 100, a heat source 200, and a cooler 300.

Specifically, the cooler 300 is connected to the inlet of the compressor and is used for cooling the working medium before the supercritical carbon dioxide enters the compressor 60; the heat regenerator 100 is connected to an outlet of the compressor, and is configured to preheat the pressurized supercritical carbon dioxide of the compressor 60 and deliver the preheated supercritical carbon dioxide to the heat source 200; the input end of the heat source 200 is connected to the heat regenerator 100, and the output end of the heat source 200 is connected to the inlet of the expansion machine, and is configured to reheat the supercritical carbon dioxide output from the heat regenerator 100, and to deliver the heated supercritical carbon dioxide to the expansion machine 70; the heat regenerator 100 is connected to the outlet of the expansion machine and the input end of the cooler 300, and is configured to pre-cool the supercritical carbon dioxide output by the expansion machine 70, and deliver the pre-cooled supercritical carbon dioxide to the cooler 300.

The heat regenerator 100 has two functions in the cycle, one is to heat the working medium at the outlet of the compressor, save fuel and improve the heat efficiency, and the other is to reduce the temperature of the working medium at the outlet of the expander, reduce the use of cooling water, save water resources and reduce the power consumption of the compressor 60; the heat source 200 is industrial waste heat, a nuclear reactor, fossil fuel, solar energy, or the like that isobarically heats supercritical carbon dioxide during a cycle, and the supercritical carbon dioxide brayton cycle power generation system can be used in any type of power plant, for example, a thermal power plant, a solar power plant, or the like, and thus the heat source 200 is different in different types of power plants; the cooler 300 is used for cooling the working medium, the cooler 300 usually uses water or air as a coolant to remove heat, and in this embodiment, the cooler 300 may be a dividing wall cooler, a spray cooler, a printed circuit board cooler, a jacketed cooler, or a coiled cooler.

It is understood that the auxiliary equipment in the power generation system includes a controller, various instruments, various pipes, and the like. All the devices are connected with the supercritical carbon dioxide compression and expansion integrated machine and all the devices through pipelines.

The power generation system provided by the embodiment comprises the supercritical carbon dioxide compression and expansion all-in-one machine, wherein the supercritical carbon dioxide compression and expansion all-in-one machine comprises a shell, a main shaft, a generator assembly and a plurality of bearings, the main shaft is arranged in the shell, the generator assembly comprises a stator and a rotor, the rotor is fixed on the main shaft, the main shaft can rotate relative to the stator, and the bearings are arranged between the main shaft and the shell; the plurality of bearings include a first bearing having a damper, the main shaft and the inner side of the housing forming an accommodating space, the first bearing being disposed in the accommodating space and supporting the main shaft in a radial direction of the main shaft. The supercritical carbon dioxide compression and expansion all-in-one machine provided by the embodiment is provided with the first bearing with the damper, so that the damping of the first bearing is increased in the rotating process of the main shaft, the vibration of the main shaft in the radial direction can be reduced, the working stability of the supercritical carbon dioxide compression and expansion all-in-one machine is improved, and the normal operation of a power generation system is ensured.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.

Claims

1. The supercritical carbon dioxide compression and expansion integrated machine is characterized by comprising a machine shell, a main shaft, a generator assembly and a plurality of bearings, wherein the main shaft is arranged in the machine shell, the generator assembly comprises a stator and a rotor, the rotor is fixed on the main shaft, the main shaft can rotate relative to the stator, and the bearings are arranged between the main shaft and the machine shell;

the plurality of bearings include a first bearing having a damper, the main shaft and the inner side of the housing form an accommodating space, and the first bearing is disposed in the accommodating space and supports the main shaft in a radial direction of the main shaft.

2. The all-in-one machine for supercritical carbon dioxide compression and expansion according to claim 1, wherein the first bearing is a sliding bearing and the first bearing is provided with an oil film damper.

3. The all-in-one machine for supercritical carbon dioxide compression and expansion as claimed in claim 1, wherein the rated working speed of the generator assembly is greater than or equal to 10000 r/min.

4. The all-in-one machine for supercritical carbon dioxide compression and expansion as claimed in claim 1 or 2, further comprising a compressor and an expander, wherein the compressor and the expander are oppositely arranged at the end part of the main shaft.

5. The all-in-one supercritical carbon dioxide compression and expansion machine according to claim 4 is characterized in that the number of the first bearings is two, the first bearings are respectively arranged on two sides of the generator assembly along the axial direction of the main shaft, the accommodating space comprises a first space and a second space, the first space and the second space are respectively arranged on two sides of the generator assembly, the first space is located between the generator assembly and the expander, the second space is located between the generator assembly and the compressor, and the two first bearings are respectively arranged in the first space and the second space.

6. The all-in-one machine for supercritical carbon dioxide compression and expansion as claimed in claim 5, wherein the plurality of bearings further comprises a second bearing, the second bearing is a thrust bearing, and the second bearing is disposed in the first space.

7. The all-in-one machine for supercritical carbon dioxide compression and expansion as claimed in claim 6, wherein the number of the second bearings is two, and the two second bearings are both arranged on the same side of the first bearing.

8. The all-in-one machine for supercritical carbon dioxide compression and expansion as claimed in claim 6 or 7, wherein the casing is provided with a compressor inlet, a compressor outlet, an expander inlet and an expander outlet, and the compressor outlet is communicated with the expander inlet;

and after entering the compressor through the compressor inlet, the supercritical carbon dioxide flows out of the compressor through the compressor outlet, after entering the expander through the expander inlet, the supercritical carbon dioxide flowing out of the compressor flows out of the expander through the expander outlet, and the supercritical carbon dioxide flowing out of the expander enters the compressor through the compressor inlet.

9. The all-in-one machine for supercritical carbon dioxide compression and expansion according to claim 8, further comprising a seal assembly, wherein the seal assembly comprises a first seal and a second seal which are independently arranged, the first seal and the second seal are both arranged on the main shaft, the first seal is arranged between the second bearing in the first space and the expander, and the second seal is arranged between the first bearing in the second space and the compressor.

10. A power generation system comprising the supercritical carbon dioxide compression and expansion all-in-one machine according to any one of claims 1 to 9.