CN212296940U - Supercritical carbon dioxide compression and expansion integrated machine - Google Patents
Supercritical carbon dioxide compression and expansion integrated machine Download PDFInfo
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- CN212296940U CN212296940U CN202020803647.9U CN202020803647U CN212296940U CN 212296940 U CN212296940 U CN 212296940U CN 202020803647 U CN202020803647 U CN 202020803647U CN 212296940 U CN212296940 U CN 212296940U
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Abstract
The embodiment of the application provides a supercritical carbon dioxide compression and expansion all-in-one, including the casing with set up the main shaft in the casing, the compressor impeller, the expander impeller, motor generator, a bearing, first sealing member and second sealing member, through with the compressor impeller, the expander impeller, motor generator, a bearing, first sealing member and second sealing member all set up on the main shaft, compressor impeller and expander impeller set up the both ends at the main shaft respectively, motor generator sets up between compressor impeller and expander impeller, the bearing corresponds the setting in main shaft and the inboard first space and the second space that form of casing with sealed, the volume of host system has been reduced, the work efficiency of host system has been improved.
Description
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.
Background
The supercritical carbon dioxide circulating power generation system is a Brayton cycle system which takes carbon dioxide in a supercritical state as a working medium, and is also called supercritical carbon dioxide (chemical formula: CO)2) 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, supercritical CO2Simple Brayton cycle power generation system and supercritical CO2The main machine system of the simple regenerative Brayton cycle power generation system comprises a compressor, an expander, a motor, a generator and a gear box, wherein the gear box comprises two gears, each gear is provided with a shaft corresponding to two shaft extension ends, one shaft is used for fixing the compressor and the expander, and the other shaft is used for fixing the motorThe machine and the generator to need to set up corresponding bearing as the support respectively at the both ends of two axles, equipment figure is many, and the structure is complicated, consequently, current host computer system has the problem that bulky and work efficiency is low.
SUMMERY OF THE UTILITY MODEL
The embodiment of the application provides a supercritical carbon dioxide compression and expansion all-in-one machine to solve the problems of large host system volume and low working efficiency in the prior art.
The embodiment of the application provides a supercritical carbon dioxide compression and expansion all-in-one machine, includes: a housing, a main shaft, a compressor impeller, an expander impeller, a motor generator, a bearing, a first seal, and a second seal;
the main shaft, the compressor impeller, the expander impeller, the motor-generator, the bearing, the first seal, and the second seal are all disposed within the casing;
the compressor impeller is fixedly connected to one end of the main shaft, and the compressor impeller and a shell around the compressor impeller form a compressor; the expander impeller is fixedly connected with the other end of the main shaft, and the expander impeller and a shell around the expander impeller form an expander;
the motor generator is fixedly connected to the main shaft and is positioned between the compressor impeller and the expander impeller;
the bearing is provided in a first space and a second space formed between the main shaft and the inside of the casing, the first space being located between the compressor impeller and the motor generator, the second space being located between the expander impeller and the motor generator;
the first seal is disposed proximate the compressor wheel and the second seal is disposed proximate the expander wheel.
Optionally, the bearing comprises: the radial bearing is used for preventing the main shaft from shifting in the radial direction, and the thrust bearing is used for preventing the main shaft from shifting in the axial direction.
Optionally, the radial bearing comprises: a first radial bearing and a second radial bearing;
the first radial bearing is disposed within the first space, the first radial bearing being located between the first seal and the motor generator;
the second radial bearing is disposed in the second space, the second radial bearing being located between the second seal and the motor generator.
Optionally, the thrust bearing is disposed within the first space, the thrust bearing being located between the first seal and the motor-generator;
optionally, the thrust bearing is disposed within the second space, the thrust bearing being located between the second seal and the motor generator.
Optionally, the bearing is a magnetic suspension bearing or a dynamic pressure gas bearing.
Optionally, a compressor inlet and a compressor outlet are provided on the casing around the compressor impeller; and an expander inlet and an expander outlet are arranged on the shell around the expander impeller.
Optionally, the first and second seals are one of the following seals: 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.
Optionally, the second seal is identical to the first seal.
Optionally, the second seal is different from the first seal.
The supercritical carbon dioxide compression and expansion integrated machine comprises a machine shell, a main shaft, a compressor impeller, an expander impeller, a motor generator, a bearing, a first sealing element and a second sealing element, wherein the main shaft, the compressor impeller, the expander impeller, the motor generator, the bearing, the first sealing element and the second sealing element are all arranged in the machine shell, the compressor impeller is fixedly connected to one end of the main shaft, the compressor impeller and the machine shell around the compressor impeller form a compressor, the expander impeller is fixedly connected to the other end of the main shaft, the expander impeller and the machine shell around the expander impeller form an expander, the motor generator is fixedly connected to the main shaft, the motor generator is positioned between the compressor impeller and the expander impeller, the bearing is arranged in a first space and a second space formed by the main shaft and the inner side of the machine shell, the first space is positioned between the compressor impeller and the motor generator, the second space is located between the expander impeller and the motor generator, the first sealing member is disposed adjacent to the compressor impeller, and the second sealing member is disposed adjacent to the expander impeller. Compared with a host system in the prior art, all the devices in the supercritical carbon dioxide compression and expansion all-in-one machine provided by the embodiment of the application share the shell and the main shaft, a gear box is omitted, the structure is more compact, a motor and a generator are replaced by a motor generator, the number of used motors and bearings is reduced, the size of the host system is reduced, and in addition, the working efficiency of the host system is improved due to the characteristics of reduction of working load and high efficiency of the motor generator.
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 shows supercritical CO2The structural schematic diagram of the simple regenerative Brayton cycle power generation system;
FIG. 2 is a diagram illustrating a host system according to the prior art;
fig. 3 is a schematic structural diagram of a first embodiment of an integrated supercritical carbon dioxide compression and expansion machine provided in the embodiments of the present application;
fig. 4 is a schematic structural diagram of a second embodiment of the supercritical carbon dioxide compression and expansion integrated machine provided in the embodiment of the present application;
fig. 5 is a schematic structural diagram of an embodiment of a supercritical carbon dioxide cycle power generation system provided in an embodiment of the present application.
Description of reference numerals:
10-a supercritical carbon dioxide compression and expansion integrated machine;
11-a housing;
12-a main shaft;
13-a compressor wheel;
14-an expander impeller;
15-a motor generator;
16-a bearing;
161-a first radial bearing;
162-a second radial bearing;
163-thrust bearing;
17-a first seal;
18-a second seal;
20-a supercritical carbon dioxide cycle power generation system;
21-a heat regenerator;
22-a heat source;
23-cooler.
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 CO is present2When the temperature and the pressure of the reaction solution reach the critical temperature of 31.1 ℃ and the critical pressure of 7.38Mpa respectively, CO2Will be in a supercritical state, i.e. supercritical CO2. Supercritical CO2The state of (A) is between liquid and gas, and has the special physical characteristics of small gas viscosity and large liquid density, so that the heat exchanger has the typical advantages of good fluidity, high heat transfer efficiency, small compressibility and the like, and in addition, supercritical CO is used2As the circulating working medium, the supercritical CO has the advantages of good engineering realizability, high circulating efficiency, small occupied area of components and systems, good economic benefit and the like, so that the supercritical CO2Is considered to be one of the most promising brayton cycle working fluids.
Supercritical CO2Supercritical CO (carbon monoxide) power generation system of Brayton cycle2The closed cycle power generation system is used as a cycle working medium. FIG. 1 shows supercritical CO2The simple heat regeneration Brayton cycle power generation system is a schematic structural diagram. As shown in FIG. 1, supercritical CO2The Brayton cycle power generation system mainly comprises core components such as a heat source, an expander, a generator, a compressor, a cooler, a heat regenerator and the like, wherein in the cycle process, a working medium is always in a supercritical state, and low-temperature and low-pressure supercritical CO is used2After the pressure of the working medium is increased by the compressor, the working medium exchanges heat with exhaust gas discharged by a gas turbine in the heat regenerator to realize preheating, after the working medium is preheated to a certain temperature, the working medium is further heated by a heat source (industrial waste heat, nuclear reactor, fossil fuel or solar energy and the like), and then the working medium enters the expander to expand and do work to drive the generator to generate electricity, the exhaust gas which does the work is discharged by the cylinder and enters the heat regenerator to exchange heat with the low-temperature high-pressure working medium discharged by the compressor,pre-cooling is achieved, the pre-cooled working medium enters a cooler for further cooling, and the cooled supercritical CO2And the next circulation is carried out in the compressor again. The host system refers to a mechanical system constituted by a rotating machine, as shown in the portion indicated by the broken line frame in fig. 1.
In order to solve the problems of multiple rotating devices, complex system and multiple fault points of the main machine system, a method for improving the main machine system through a gear box is provided in the prior art, fig. 2 is a schematic structural diagram of the main machine system in the prior art, as shown in fig. 2, the gear box comprises two gears, each gear is provided with a shaft corresponding to two shaft extending ends, wherein one shaft is used for fixing a compressor and an expander, the other shaft is used for fixing a motor and a generator, and corresponding bearings are respectively arranged on two ends of the two shafts as supports, in addition, oil-lubricated bearings are generally adopted in the prior art, in order to ensure the working capacity and the service life of the oil-lubricated bearings, a lubricating oil supply system is also required to be arranged, and therefore, because the main machine system in the prior art needs to comprise four rotating devices of the compressor, the expander, the motor and the generator, and auxiliary equipment and systems such as a gear box, an oil lubrication bearing, a lubricating oil supply system and the like, so that the volume of a host system is large and the working efficiency is not high.
The main idea of the application is as follows: based on the problems in the prior art, the application provides a supercritical carbon dioxide compression and expansion all-in-one machine, through adopting the motor generator to replace a motor and a generator, and designing the motor generator, a compressor impeller, an expander impeller, a bearing and other equipment or parts to share a main shaft and a machine shell, the structure is more compact, and the compressor and the expander are sealed through sealing (parts), the number of rotating equipment is reduced, a gear box and a lubricating oil supply system are not needed any more, the load is reduced, the size of a host system is reduced, and meanwhile, the working efficiency of the host system is also improved.
Fig. 3 is a schematic structural diagram of a first embodiment of the supercritical carbon dioxide compression and expansion integrated machine provided in the embodiment of the present application. As shown in fig. 3, the supercritical carbon dioxide compression and expansion integrated machine 10 in the present embodiment includes: a casing 11, a main shaft 12, a compressor impeller 13, an expander impeller 14, a motor generator 15, a bearing 16, a first seal 17, and a second seal 18.
In the embodiment of the present application, an integrated design is adopted, and the main shaft 12, the compressor impeller 13, the expander impeller 14, the motor generator 15, the bearing 16, the first seal 17, and the second seal 18 are all disposed in the casing 11, that is, all the components share the casing. Further, in order to ensure the compactness of the entire structure, the compressor impeller 13 and the expander impeller 14 are made to share the main shaft 12, specifically, the compressor impeller 13 is fixedly connected to one end of the main shaft 12, the compressor impeller 13 and the casing around it constitute a compressor, as shown by the left broken line frame in fig. 3, the expander impeller 14 is fixedly connected to the other end of the main shaft 12, and the expander impeller 14 and the casing around it constitute an expander, as shown by the right broken line frame in fig. 3.
When the supercritical carbon dioxide compression and expansion integrated machine works, the compressor is used for compressing low-pressure circulating working media (supercritical carbon dioxide) entering the compressor so as to obtain high-pressure circulating working media. The expansion machine is used for expanding the high-temperature and high-pressure circulating working medium entering the expansion machine and applying work to the outside by utilizing the heat energy of the circulating working medium.
In order to further increase the compactness of the overall structure, the motor generator 15 is also fixedly connected to the main shaft 12, and the motor generator 15 is located between the compressor impeller 13 and the expander impeller 14 in a spatial position. The motor generator 15 is a motor device capable of converting electric energy and mechanical energy, and as is known from the reversible principle of a motor, the same motor generator 15 can operate as both a generator and a motor. Specifically, when the motor generator 15 operates with positive torque, it is able to convert electrical energy into mechanical energy, corresponding to a motor, and when the motor generator 15 operates with negative torque, it is able to convert mechanical energy into electrical energy, corresponding to a generator.
In this embodiment, when the supercritical carbon dioxide compression and expansion integrated machine 10 is started, the motor generator 15 works in a motor mode, and the motor generator serves as a power source for the compressor impeller 13 and the expander impeller 14 to drive the compressor impeller 13 and the expander impeller 14 to rotate; when the output work of the expander impeller 14 is greater than the consumed work of the supercritical carbon dioxide compression and expansion all-in-one machine 10, the expander impeller 14 rotates to drive the motor generator 15 and the compressor impeller 13 to rotate, and the motor generator 15 is switched to a generator mode to realize power generation.
The bearing 16 is one of the important parts in the host system, and is mainly used for supporting and guiding the rotation of the shaft, so as to reduce the friction coefficient of the shaft during the rotation process and ensure the revolution precision of the shaft.
Specifically, in the present embodiment, the bearing 16 is disposed in a first space and a second space formed between the main shaft 12 and the inner side of the casing 11, wherein the first space is located between the compressor impeller 13 and the motor generator 15, and the second space is located between the expander impeller 14 and the motor generator 15, that is, the bearing 16 is divided into two parts, one part is located in the first space formed by the main shaft 12, the casing 11, the compressor impeller 13 and the motor generator 15, and the other part is located in the second space formed by the main shaft 12, the casing 11, the expander impeller 14 and the motor generator, so that the main shaft 12 can be well supported, and it is ensured that the main shaft 12 rotates in a certain space without deviation.
In this embodiment, the bearing 16 may be any type or form of bearing known in the art. Optionally, to further improve the performance of the host system, the bearing 16 is a magnetic suspension bearing or a dynamic pressure air bearing.
The magnetic suspension bearing is also called an electromagnetic bearing or a magnetic bearing, and is a novel high-performance bearing which suspends the bearing in space without mechanical friction and lubrication by utilizing magnetic field force. Compared with an oil-lubricated bearing, the magnetic suspension bearing has the characteristic of no need of lubrication, a lubricating oil supply system is omitted, oil stains are not generated by adopting a magnetic suspension mode, mechanical wear is smaller, and energy consumption is lower.
The dynamic pressure gas bearing is a kind of gas bearing, and is a bearing in which gas (carbon dioxide in this embodiment) is brought into a convergent area between surfaces of a sliding pair by mutual movement of the sliding pair to form an air film, and a load is supported by the air film. Compared with an oil-lubricated bearing, the dynamic pressure air-float bearing can form an air film by using a working medium (carbon dioxide) in the system, so that the lubricating effect is achieved, a lubricating oil supply system is omitted, and the dynamic pressure air-float bearing also has the advantages of small friction coefficient, high precision, high running speed, no pollution and the like.
In the implementation mode, the magnetic suspension bearing or the dynamic pressure air bearing is used as the support, so that the stability, reliability and other performances of the host system are further improved, and the work efficiency of the host system is favorably improved.
In this embodiment, because the compressor impeller 13 and the expander impeller 14 share the main shaft 12, 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 and the expander on the circulating working medium are completely different, and in order to ensure the effectiveness and the safety of the work, the compressor and the expander need to be respectively sealed on the main shaft. Specifically, in the present embodiment, the first sealing member 17 is disposed on the main shaft 12 near the compressor impeller 13 to perform the sealing function on the compressor, and the second sealing member 18 is disposed on the main shaft 12 near the expander 14 to perform the sealing function on the expander, so as to ensure that the circulating medium entering the compressor and the expander does not leak outwards.
The seal, also called a sealing or sealing structure, is used to prevent leakage of supercritical carbon dioxide from inside the compressor or expander. In a specific design use, one of the following seals may optionally be used as the first seal or the second seal: 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 element and the second sealing element which are selected can 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.
In addition, it can be understood that corresponding inlets and outlets are reserved on the casing 11 around the compressor impeller 13 and the expander impeller 14, so that when the supercritical carbon dioxide compression and expansion all-in-one machine works, the circulating working medium flows in and out, for example, a compressor inlet and a compressor outlet are reserved on the casing around the compressor impeller, and an expander inlet and an expander outlet are reserved on the casing around the expander impeller.
The embodiment provides a supercritical carbon dioxide compression and expansion all-in-one machine, includes: the main shaft, the compressor impeller, the expander impeller, the motor generator, the bearing, the first sealing element and the second sealing element are all arranged in the shell, the compressor impeller is fixedly connected to one end of the main shaft, the compressor impeller and the shell around the compressor impeller form a compressor, the expander impeller is fixedly connected to the other end of the main shaft, the expander impeller and the shell around the expander impeller form an expander, the motor generator is fixedly connected to the main shaft, the motor generator is positioned between the compressor impeller and the expander impeller, the bearing is arranged in a first space and a second space formed by the main shaft and the inner side of the shell, the first space is positioned between the compressor impeller and the motor generator, the second space is positioned between the expander impeller and the motor generator, the first sealing element is arranged close to the compressor impeller, the first seal is used to seal the compressor, the second seal is located adjacent the expander impeller, and the second seal is used to seal the expander. Compared with a host system in the prior art, all the devices in the supercritical carbon dioxide compression and expansion all-in-one machine provided by the embodiment of the application share the shell and the main shaft, a gear box is omitted, the structure is more compact, a motor and a generator are replaced by a motor generator, the number of used motors and bearings is reduced, the size of the host system is reduced, and in addition, due to the characteristics of reduction of working load and high efficiency of the motor generator, the working efficiency of the host system is improved.
Fig. 4 is a schematic structural diagram of a second embodiment of the supercritical carbon dioxide compression and expansion integrated machine provided in the embodiment of the present application. On the basis of the embodiment shown in fig. 3, as shown in fig. 4, in the present embodiment, the bearing 16 includes: a first radial bearing 161, a second radial bearing 162, and a thrust bearing 163.
In order to ensure the radial control of the main shaft 12 by the bearing, two radial bearings are required, the first radial bearing 161 and the second radial bearing 162 cooperate to prevent the main shaft 12 from shifting in the radial direction, and in order to ensure the axial control of the main shaft 12 by the bearing, the thrust bearing 163 is arranged to prevent the main shaft 12 from shifting in the axial direction, so that the first radial bearing 161, the second radial bearing 162 and the thrust bearing 163 cooperate to ensure that the main shaft 12 rotates at a preset spatial position without shifting in the radial direction or the axial direction.
To ensure the control effect in the radial direction, the first radial bearing 161 and the second radial bearing 162 are respectively disposed on both sides of the motor generator 15, and in a possible implementation, the first radial bearing 161 is disposed in the first space, and the first radial bearing 161 is disposed between the first seal 17 and the motor generator 15, the second radial bearing 162 is disposed in the second space, and the second radial bearing 162 is disposed between the second seal 18 and the motor generator 15.
Since only one thrust bearing 163 is required to achieve axial control of the main shaft 12, the position thereof can be set more flexibly, and specifically, the thrust bearing 163 is disposed in the first space or the second space.
In one possible implementation, the thrust bearing 163 is provided in the first space, and specifically, the thrust bearing 163 is provided between the first seal 17 and the motor generator 15, for example, between the first seal 17 and the first radial bearing 161, and also between the first radial bearing 161 and the motor generator 15.
In another possible implementation, the thrust bearing 163 is provided in the second space, and specifically, the thrust bearing 163 is provided between the second seal 18 and the motor generator 15, for example, between the second seal 18 and the second radial bearing 162, and also between the second radial bearing 162 and the motor generator 15.
The embodiment of the application provides a supercritical carbon dioxide compression and expansion all-in-one machine, include journal bearing and thrust bearing through setting up the bearing, and set up journal bearing and include first journal bearing and second journal bearing, first journal bearing sets up in first space, first journal bearing is located between first sealing member and the motor generator, second journal bearing sets up in the second space, second journal bearing is located between second sealing member and the motor generator, through first journal bearing and second journal bearing combined action, thereby prevent that the main shaft from taking place the skew in the radial, and set up thrust bearing and be located in first space or second space, thereby prevent that the main shaft from taking place the skew in the axial, through journal bearing and thrust bearing's combined action, improved to main shaft job stabilization nature and reliability, be favorable to further improving work of supercritical carbon dioxide compression and expansion all-in-machine and supercritical carbon dioxide cycle power generation system The efficiency is high.
The embodiment of the application also provides a supercritical carbon dioxide cycle power generation system, which comprises the supercritical carbon dioxide compression and expansion integrated machine in the embodiment shown in fig. 3 or fig. 4. For example, taking a supercritical carbon dioxide simple regenerative brayton cycle power generation system as an example, fig. 5 is a schematic structural diagram of an embodiment of the supercritical carbon dioxide cycle power generation system provided in the embodiment of the present application, and as shown in fig. 5, a supercritical carbon dioxide cycle power generation system 20 in the embodiment includes:
a regenerator 21, a heat source 22, a cooler 23 and a supercritical carbon dioxide compression and expansion integrated machine 10.
The cooler 23 is connected with a compressor inlet on the shell of the supercritical carbon dioxide compression and expansion all-in-one machine 10 and is used for cooling the working medium before the supercritical carbon dioxide enters the compressor;
the heat regenerator 21 is connected with a compressor outlet on the casing of the supercritical carbon dioxide compression and expansion all-in-one machine 10, and is used for preheating the supercritical carbon dioxide pressurized by the compressor and transmitting the preheated supercritical carbon dioxide to the heat source 22;
the input end of the heat source 22 is connected with the heat regenerator 21, and the output end of the heat source 22 is connected with the inlet of the expansion machine on the casing of the supercritical carbon dioxide compression and expansion all-in-one machine 10, and is used for reheating the supercritical carbon dioxide output from the heat regenerator 21 and conveying the heated supercritical carbon dioxide to the expansion machine;
the heat regenerator 21 is connected to an outlet of the expansion machine on the casing of the all-in-one machine 10 for compressing and expanding supercritical carbon dioxide and an input end of the cooler 23, and is configured to pre-cool the supercritical carbon dioxide output by the expansion machine and deliver the pre-cooled supercritical carbon dioxide to the cooler 23.
The heat regenerator 21 has two functions in the cycle, one is used for heating the working medium at the outlet of the compressor, so that the fuel is saved, the heat efficiency is improved, the other is used for reducing the temperature of the working medium at the outlet of the expander, reducing the use of cooling water, saving water resources and simultaneously reducing the power consumption of the compressor.
The heat source 22 is industrial waste heat, a nuclear reactor, fossil fuel, solar energy, or the like that heats critical carbon dioxide isobarically during a cycle, and the supercritical carbon dioxide brayton cycle 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 22 is different in different types of power plants.
The cooler 23 is used for cooling the working medium, the cooler usually uses water or air as a coolant to remove heat, and the cooler 23 in this embodiment 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. The devices are connected with the supercritical carbon dioxide compression and expansion integrated machine 10 and the devices are connected with each other through pipelines.
The supercritical carbon dioxide brayton cycle power generation system provided by the embodiment forms the host system by using the supercritical carbon dioxide compression and expansion all-in-one machine, and the supercritical carbon dioxide compression and expansion all-in-one machine has smaller volume and higher working efficiency, so that the volume of the supercritical carbon dioxide brayton cycle power generation system is correspondingly reduced, and the working efficiency is correspondingly improved.
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 (10)
1. An all-in-one machine for compressing and expanding supercritical carbon dioxide, comprising: a housing, a main shaft, a compressor impeller, an expander impeller, a motor generator, a bearing, a first seal, and a second seal;
the main shaft, the compressor impeller, the expander impeller, the motor-generator, the bearing, the first seal, and the second seal are all disposed within the casing;
the compressor impeller is fixedly connected to one end of the main shaft, and the compressor impeller and a shell around the compressor impeller form a compressor; the expander impeller is fixedly connected with the other end of the main shaft, and the expander impeller and a shell around the expander impeller form an expander;
the motor generator is fixedly connected to the main shaft and is positioned between the compressor impeller and the expander impeller;
the bearing is provided in a first space and a second space formed between the main shaft and the inside of the casing, the first space being located between the compressor impeller and the motor generator, the second space being located between the expander impeller and the motor generator;
the first seal is disposed proximate the compressor wheel and the second seal is disposed proximate the expander wheel.
2. The supercritical carbon dioxide compression and expansion all-in-one machine as claimed in claim 1 wherein the bearing comprises: the radial bearing is used for preventing the main shaft from shifting in the radial direction, and the thrust bearing is used for preventing the main shaft from shifting in the axial direction.
3. The supercritical carbon dioxide compression and expansion all-in-one machine as claimed in claim 2 wherein the radial bearing comprises: a first radial bearing and a second radial bearing;
the first radial bearing is disposed within the first space, the first radial bearing being located between the first seal and the motor generator;
the second radial bearing is disposed in the second space, the second radial bearing being located between the second seal and the motor generator.
4. The all-in-one machine for supercritical carbon dioxide compression and expansion according to claim 2, wherein the thrust bearing is disposed in the first space, the thrust bearing being located between the first seal and the motor generator.
5. The all-in-one machine for supercritical carbon dioxide compression and expansion as claimed in claim 2, wherein the thrust bearing is disposed in the second space, the thrust bearing being located between the second seal and the motor generator.
6. The all-in-one machine for supercritical carbon dioxide compression and expansion according to any one of claims 1 to 5, wherein the bearing is a magnetic suspension bearing or a dynamic pressure gas bearing.
7. The all-in-one machine for supercritical carbon dioxide compression and expansion according to any one of claims 1 to 5, wherein a compressor inlet and a compressor outlet are arranged on the casing around the compressor impeller; and an expander inlet and an expander outlet are arranged on the shell around the expander impeller.
8. The supercritical carbon dioxide compression and expansion all-in-one machine according to any one of claims 1-5, wherein the first seal and the second seal are one of the following seals: 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.
9. The all-in-one machine for supercritical carbon dioxide compression and expansion according to claim 8, wherein the second seal is the same as the first seal.
10. The all-in-one machine for supercritical carbon dioxide compression and expansion according to claim 8, wherein the second seal is different from the first seal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020803647.9U CN212296940U (en) | 2020-05-14 | 2020-05-14 | Supercritical carbon dioxide compression and expansion integrated machine |
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| CN202020803647.9U CN212296940U (en) | 2020-05-14 | 2020-05-14 | Supercritical carbon dioxide compression and expansion integrated machine |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112944775A (en) * | 2021-02-10 | 2021-06-11 | 西安交通大学 | Low-temperature refrigerator |
| CN113931705A (en) * | 2021-11-02 | 2022-01-14 | 上海发电设备成套设计研究院有限责任公司 | Turbine rotor device and operation method thereof |
| CN114109861A (en) * | 2021-11-25 | 2022-03-01 | 海德韦尔(太仓)能源科技有限公司 | Thrust bearing arrangement structure of air compressor |
| CN114165946A (en) * | 2021-09-19 | 2022-03-11 | 青岛海尔空调器有限总公司 | Heat exchanger and air conditioner |
| CN114233651A (en) * | 2021-12-20 | 2022-03-25 | 中国科学院工程热物理研究所 | Axial flow compression expansion type energy conversion device and control method |
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2020
- 2020-05-14 CN CN202020803647.9U patent/CN212296940U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112944775A (en) * | 2021-02-10 | 2021-06-11 | 西安交通大学 | Low-temperature refrigerator |
| CN114165946A (en) * | 2021-09-19 | 2022-03-11 | 青岛海尔空调器有限总公司 | Heat exchanger and air conditioner |
| CN113931705A (en) * | 2021-11-02 | 2022-01-14 | 上海发电设备成套设计研究院有限责任公司 | Turbine rotor device and operation method thereof |
| CN113931705B (en) * | 2021-11-02 | 2024-04-23 | 上海发电设备成套设计研究院有限责任公司 | Turbine rotor device and operation method thereof |
| CN114109861A (en) * | 2021-11-25 | 2022-03-01 | 海德韦尔(太仓)能源科技有限公司 | Thrust bearing arrangement structure of air compressor |
| CN114233651A (en) * | 2021-12-20 | 2022-03-25 | 中国科学院工程热物理研究所 | Axial flow compression expansion type energy conversion device and control method |
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