CN117905548A - Regenerative Supercritical Carbon Dioxide Brayton Cycle System - Google Patents

Abstract

The application relates to the technical field of thermal power generation, and provides a regenerative supercritical carbon dioxide Brayton cycle system, which can comprise: heat source, turbine, regenerator, precooler, compressor and generator. The turbine comprises a medium inlet and a medium outlet, and the medium inlet is communicated with the heating outlet; the heat regenerator is arranged on the outer side of the periphery of the turbine in a surrounding mode, the heat regenerator comprises a first channel and a second channel, the medium outlet is communicated with the first channel, and the second channel is communicated with the heat source; the precooler is communicated with the first channel; the precooler is arranged on the outer side of the periphery of the compressor, the compressor comprises a compression inlet and a compression outlet, the compression inlet is communicated with the precooler, and the compression outlet is communicated with the second channel; the generator is connected with the output shaft, and the output shaft drives the generator to generate electricity, and the generator is used for driving the compressor to operate. According to the Brayton cycle system provided by the embodiment, the whole space occupation of the system is reduced, and the whole integration level is improved.

Description

Regenerative Supercritical Carbon Dioxide Brayton Cycle System

Technical Field

The present disclosure relates to the field of thermal power generation technology, and in particular to a heat recovery supercritical carbon dioxide Brayton cycle system.

Background technique

Supercritical carbon dioxide has physical properties such as large reserves, strong compressibility, and not easy to react with other substances. Compared with power cycles using supersaturated water vapor, helium, etc. as media, supercritical carbon dioxide Brayton direct cycle is easier to achieve high efficiency. At the same time, the turbine machinery required for supercritical carbon dioxide cycle has a smaller size and low production cost, so supercritical carbon dioxide has become the first choice for the power cycle medium of the new generation of nuclear power plants.

At present, the patents related to supercritical carbon dioxide power cycle equipment published in China only have the overall principle design, and no specific mechanical structure is proposed.

Summary of the invention

In order to solve the above technical problems or at least partially solve the above technical problems, the present disclosure provides a regenerative supercritical carbon dioxide Brayton cycle system.

The present application discloses a heat-recovery supercritical carbon dioxide Brayton cycle system, which may include: a heat source, a turbine, a regenerator, a precooler, a compressor and a generator, wherein the heat source includes a heating inlet and a heating outlet; the turbine includes a medium inlet, a medium outlet and an output shaft, and the medium inlet is connected to the heating outlet; the regenerator is arranged on the circumferential outer side of the turbine, the regenerator includes a first channel and a second channel, the medium outlet is connected to the first channel, and the second channel is connected to the heating inlet; the precooler is connected to the first channel; the precooler is arranged on the circumferential outer side of the compressor, the compressor includes a compression inlet and a compression outlet, the compression inlet is connected to the precooler, and the compression outlet is connected to the second channel; the generator is connected to the output shaft, the output shaft drives the generator to generate electricity, and the generator is used to drive the compressor to operate.

In this way, this embodiment provides a specific structure and specific equipment composition of a regenerative supercritical carbon dioxide Brayton cycle system, in which the heat source is used to heat the carbon dioxide, the turbine is used to perform turbine work, drive the generator to generate electricity, and the generator drives the compressor to run once to form a cycle, wherein the regenerator is arranged on the circumferential outside of the turbine, and the precooler is arranged on the circumferential outside of the compressor, which can reduce the overall space occupancy of the system to a certain extent and improve the overall integration of the system.

In some embodiments of the present application, the first channel includes a first annular channel and a second annular channel, one end of the first annular channel is connected to the medium outlet, the other end is connected to the second annular channel, and the second annular channel is connected to the precooler.

In some embodiments of the present application, the second channel includes a third annular channel and a fourth annular channel, one end of the third annular channel is connected to the compression outlet, and the other end is connected to the fourth annular channel, and the fourth annular channel is connected to the heat source.

In some embodiments of the present application, the heat regenerator also includes a first conduction module, which is formed by stacking a plurality of heat exchange sheets, wherein the plurality of heat exchange sheets include a plurality of first heat exchange sheets and a plurality of second heat exchange sheets; the first heat exchange sheet is provided with a first connecting groove, one end of the first connecting groove is connected to the first annular channel, and the other end is connected to the second annular channel; the second heat exchange sheet is provided with a second connecting groove, one end of the second connecting groove is connected to the third annular channel, and the other end is connected to the fourth annular channel.

In some embodiments of the present application, the first conduction module is formed by sequentially overlapping a first heat exchange sheet and a second heat exchange sheet.

In some embodiments of the present application, there are multiple first conduction modules.

In some embodiments of the present application, the precooler includes a fifth annular channel and a sixth annular channel, the fifth annular channel is connected to the first channel, and the sixth annular channel is connected to the compression inlet.

In some embodiments of the present application, the precooler includes a cooler, and the cooler is used to cool the medium in the fifth annular channel and the sixth annular channel.

In some embodiments of the present application, the precooler includes a seventh annular channel and an eighth annular channel connected to each other, the seventh annular channel is connected to the eighth annular channel, the seventh annular channel is connected to the inlet of the cooler, and the eighth annular channel is connected to the outlet of the cooler.

In some embodiments of the present application, the precooler also includes a second conduction module, which is formed by a plurality of stacked heat exchange sheets, the plurality of heat exchange sheets including a plurality of third heat exchange sheets and a plurality of fourth heat exchange sheets; the third heat exchange sheet is provided with a third connecting groove, one end of the third connecting groove is connected to the fifth annular channel, and the other end is connected to the sixth annular channel; the fourth heat exchange sheet is provided with a fourth connecting groove, one end of the fourth connecting groove is connected to the seventh annular channel, and the other end is connected to the eighth annular channel.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

FIG1 is a schematic flow diagram of a regenerative supercritical carbon dioxide Brayton cycle system provided in some embodiments of the present application;

FIG2 is a schematic diagram of a regenerative supercritical carbon dioxide Brayton cycle system provided in some embodiments of the present application;

FIG3 is a cross-sectional view of the Brayton cycle system shown in FIG2 ;

FIG4 is a schematic diagram of the regenerator and cooler shown in FIG2 ;

FIG5 is a cross-sectional view of the regenerator shown in FIG4 ;

FIG6 is a schematic diagram of a first heat exchange sheet provided in some embodiments of the present application;

FIG7 is a schematic diagram of a second heat exchange sheet provided in some embodiments of the present application;

FIG8 is a schematic diagram of the cooler shown in FIG4;

FIG9 is a schematic diagram of a third heat exchange sheet provided in some embodiments of the present application;

FIG. 10 is a schematic diagram of a fourth heat exchange sheet provided in some embodiments of the present application.

Reference numerals:

100. Brayton cycle system;

120, regenerator; 124, first channel; 1241, first annular channel; 1242, second annular channel; 1243, third annular channel; 1244, fourth annular channel; 1245, first conduction module; 1246, heating connecting pipe; 125, second channel; 126, first heat exchange fin; 1261, first connecting groove; 127, second heat exchange fin; 1271, second connecting groove;

130, turbine; 131, output shaft; 132, medium inlet; 133, medium outlet;

140, precooler; 141, fifth annular channel; 142, sixth annular channel; 143, seventh annular channel; 144, eighth annular channel; 145, second conduction module; 146, third heat exchange fin; 1461, third connecting groove; 147, fourth heat exchange fin; 1471, fourth connecting groove;

150, compressor; 151, compression inlet;

160. Generator.

Detailed ways

In order to more clearly understand the above-mentioned objectives, features and advantages of the present disclosure, the scheme of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features in the embodiments can be combined with each other without conflict.

In the following description, many specific details are set forth to facilitate a full understanding of the present disclosure, but the present disclosure may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present disclosure, rather than all of the embodiments.

Referring to FIGS. 1 to 3 , the present application discloses a regenerative supercritical carbon dioxide Brayton cycle system 100, wherein supercritical carbon dioxide is a liquid carbon dioxide, which is formed at a certain temperature and pressure, i.e., at or above the critical point, when the interface between the liquid and gaseous states suddenly disappears, forming a new state, which has some properties of both gaseous and liquid states, and also has new properties. The Brayton cycle is a thermodynamic cycle, which is mainly used to convert thermal energy into mechanical energy or other forms of energy.

The Brayton cycle system 100 may include a heat source, a turbine 130 , a regenerator 120 , a precooler 140 , a compressor 150 , and a generator 160 .

Among them, the heat source can be a carbon dioxide reactor, and the turbine 130 is a machine that converts energy contained in a fluid medium into mechanical energy. The turbine 130 includes an output shaft 131, and the output shaft 131 of the turbine 130 is connected to a generator 160 for driving the generator 160 to generate electricity, and the generator 160 is used to drive the compressor 150 to operate.

Specifically, please refer to Figure 1. High-temperature and high-pressure carbon dioxide flows out from the heat source and first flows through the turbine 130. The high-temperature and high-pressure carbon dioxide drives the turbine 130 to do work, drives the generator 160 to generate electricity, and the generator 160 drives the compressor 150 to operate. The carbon dioxide flowing out of the turbine 130 flows to the regenerator 120 for cooling. The carbon dioxide flowing out of the regenerator 120 is further cooled after passing through the precooler 140. The carbon dioxide flowing out of the precooler 140 flows to the compressor 150. The compressor 150 pressurizes the carbon dioxide. The carbon dioxide flowing out of the compressor 150 flows to the regenerator 120. The regenerator 120 heats the carbon dioxide. The carbon dioxide flowing out of the regenerator 120 finally flows to the heat source to form a cycle.

The heat source may include a heating inlet and a heating outlet, the turbine 130 may include a medium inlet 132 and a medium outlet 133, and the medium inlet 132 is connected to the heating outlet. The regenerator 120 may include a first channel 124 and a second channel 125, the medium outlet 133 is connected to the first channel 124, and the second channel 125 is connected to the heat source. The precooler 140 is connected to the first channel 124; the compressor 150 may include a compression inlet 151 and a compression outlet, the compression inlet 151 is connected to the precooler 140, and the compression outlet is connected to the second channel 125.

Taking the specific implementation process shown in FIG. 1 as an example, the high-temperature and high-pressure carbon dioxide (pressure of 16 standard atmospheres and temperature of 550° C.) passing through the heat source flows from the heating outlet to the medium inlet 132 of the turbine 130, and the turbine 130 converts the energy of the fluid into mechanical energy, and the high-temperature and low-pressure carbon dioxide (pressure of 8 standard atmospheres and temperature of 429.96° C.) is discharged from the medium outlet 133 and flows to the first channel 124 of the regenerator 120, and the carbon dioxide flowing through the first channel 124 is cooled to obtain low-temperature and low-pressure carbon dioxide (pressure of 8 standard atmospheres and temperature of 85° C.) , then flows to the precooler 140 for further cooling to obtain low-temperature and low-pressure carbon dioxide (pressure is 8 standard atmospheres, temperature is 35°C), then flows to the compressor 150 for pressurization to obtain low-temperature and high-pressure carbon dioxide (pressure is 16 standard atmospheres, temperature is 70.2°C), then flows to the regenerator 120 for heating to obtain high-temperature and high-pressure carbon dioxide (pressure is 16 standard atmospheres, temperature is 328 degrees Celsius), and then flows to the heating inlet of the heat source for further heating to obtain high-temperature and high-pressure carbon dioxide (pressure is 16 standard atmospheres, temperature is 550°C), thus forming a cycle.

Among them, the carbon dioxide a flowing from the turbine 130 to the precooler 140 is cooled by the regenerator 120, and the carbon dioxide b flowing from the compressor 150 to the heat source is heated by the regenerator 120. It can be understood that during the circulation process, the carbon dioxide a transfers heat to the carbon dioxide b to achieve the cooling of the carbon dioxide a and the heating of the carbon dioxide b, thereby reducing heat loss and improving energy utilization efficiency.

In some embodiments of the present application, referring to FIG. 3 , the turbine 130, the compressor 150 and the generator 160 are coaxially arranged, the regenerator 120 is arranged on the outer side of the turbine 130, and the precooler 140 is arranged on the outer side of the compressor 150. In this way, the space occupied by the whole system can be reduced to a certain extent, and the integration of the whole system can be improved.

Specifically, referring to FIG. 4 , the regenerator 120 is formed in a cylindrical shape, the turbine 130 is located inside the regenerator 120 , the precooler 140 is formed in a cylindrical shape, and the compressor 150 is located inside the precooler 140 .

In some embodiments of the present application, referring to FIG. 5 and FIG. 3 , the first channel 124 may include a first annular channel 1241 and a second annular channel 1242, one end of the first annular channel 1241 is in communication with the medium outlet 133, and the other end is in communication with the second annular channel 1242. Thus, by setting the first annular channel 1241 and the second annular channel 1242 in annular shapes, on the one hand, the space outside the circumference of the turbine 130 can be fully utilized, the length of the first channel 124 can be increased, and the movement path of the carbon dioxide in the first channel 124 can be increased, and on the other hand, the overall integration of the system can be increased.

Specifically, please refer to Figure 5. The second annular channel 1242 is located on the circumferential outside of the first annular channel 1241. The first annular channel 1241 is formed in a cylindrical shape. One axial end of the first annular channel 1241 is connected to the medium outlet 133, and the other end is connected to the second annular channel 1242. This can maximize the movement path of carbon dioxide in the first channel 124, thereby improving the heat exchange effect.

In some embodiments of the present application, referring to FIG. 5 and FIG. 3 , the second channel 125 may include a third annular channel 1243 and a fourth annular channel 1244. The first end of the third annular channel 1243 is connected to the compression outlet, and the other end is connected to the fourth annular channel 1244. The fourth annular channel 1244 is connected to the heating inlet. Therefore, by setting the third annular channel 1243 and the fourth annular channel 1244 in annular shapes, on the one hand, the space outside the circumference of the turbine 130 can be fully utilized, the length of the second channel 125 can be increased, and the movement path of carbon dioxide in the second channel 125 can be increased. On the other hand, the overall integration of the Brayton cycle system 100 is also increased.

The fourth annular channel 1244 is provided with a heating connecting pipe 1246 connected to the heating inlet, so as to achieve the connection between the fourth annular channel 1244 and the heating inlet.

Specifically, the third annular channel 1243 is located at one end of the regenerator 120 axially close to the compressor 150, and the fourth annular channel 1244 is located at one end of the regenerator 120 axially away from the compressor 150. In this way, the distance between the third annular channel 1243 and the fourth annular channel 1244 can be increased, and the flow path of carbon dioxide in the second channel 125 can be increased, thereby improving the heat exchange effect.

In some embodiments of the present application, please continue to refer to FIG. 5. The regenerator 120 may further include a first conduction module 1245, which is formed by stacking a plurality of heat exchange thin sheets, and the plurality of heat exchange thin sheets may include a plurality of first heat exchange thin sheets 126 and a plurality of second heat exchange thin sheets 127. The first heat exchange thin sheet 126 is provided with a first connecting groove 1261, one end of which is connected to the first annular channel 1241, and the other end is connected to the second annular channel 1242. The second heat exchange thin sheet 127 is provided with a second connecting groove 1271, one end of which is connected to the third annular channel 1243, and the other end is connected to the fourth annular channel 1244.

In this way, by providing the first conduction module 1245 , the first annular channel 1241 and the second annular channel 1242 , the third annular channel 1243 and the fourth annular channel 1244 are connected respectively.

The number of the first connecting grooves 1261 on the first heat exchange fin 126 can be multiple, and the number of the second connecting grooves 1271 on the second heat exchange fin 127 can be multiple.

In a specific implementation process, the number of the first connecting grooves 1261 on the first heat exchange fin 126 can be five, ten, fifteen, twenty, etc.; the number of the second connecting grooves 1271 on the second heat exchange fin 127 can be five, ten, fifteen, twenty, etc.

In some embodiments of the present application, please refer to Figures 5 to 7, the first conduction module 1245 is formed by the first heat exchange sheet 126 and the second heat exchange sheet 127 overlapping in sequence, that is, the first connecting groove 1261 and the second connecting groove 1271 are arranged at intervals. It should be noted that heat exchange is carried out between the carbon dioxide flowing through the first connecting groove 1261 and the carbon dioxide flowing through the second connecting groove 1271. In this way, the first heat exchange sheet 126 and the second heat exchange sheet 127 overlap in sequence, which can better ensure the heat exchange effect between the carbon dioxide flowing through the first connecting groove 1261 and the carbon dioxide flowing through the second connecting groove 1271, thereby improving the heat exchange effect of the heat regenerator 120.

Specifically, please refer to Figures 5 to 7. The first conduction module 1245 is located between the third annular channel 1243 and the fourth annular channel 1244. The first conduction module 1245 is located on the circumferential outside of the first annular channel 1241. The first conduction module 1245 is located on the circumferential outside of the second annular module. In this way, while ensuring that the first annular channel 1241 is connected to the second annular channel 1242 and the third annular channel 1243 is connected to the fourth annular channel 1244, the integration between components is improved and the space occupied by the heat regenerator 120 is reduced.

In some embodiments of the present application, there are multiple first conduction modules 1245, and the multiple first conduction modules 1245 are arranged at intervals in the circumferential direction of the turbine 130. In this way, during the flow of carbon dioxide in the first annular channel 1241 and the second annular channel 1242, and in the flow of carbon dioxide in the third annular channel 1243 and the fourth annular channel 1244, the number of heat exchange fins is increased, thereby increasing the heat exchange area and improving the heat exchange effect of the heat regenerator 120.

In a specific implementation process, the number of the first conduction modules 1245 can be two, three, four, five, six, etc.

In some embodiments of the present application, the regenerator 120 may further include a regenerator 120 shell, which defines a housing space, and the first annular channel 1241, the second annular channel 1242, the third annular channel 1243, the fourth annular channel 1244 and the first conduction module 1245 are all located in the housing space of the regenerator 120.

In some embodiments of the present application, referring to FIG. 8 to FIG. 10 , the precooler 140 may include a fifth annular channel 141 and a sixth annular channel 142, wherein the fifth annular channel 141 is in communication with the third annular channel 1243, and the sixth annular channel 142 is in communication with the compression inlet 151. Thus, the communication between the precooler 140 and the regenerator 120 is achieved by providing the fifth annular channel 141, and the communication between the precooler 140 and the compressor 150 is achieved by providing the sixth annular channel 142. By providing the fifth annular channel 141 and the sixth annular channel 142 in annular shapes, the space outside the circumference of the compressor 150 can be fully utilized, thereby increasing the overall integration of the system.

Specifically, the compressor is formed into a cylindrical shape, the fifth annular channel 141 is located at one end of the compressor axial direction, and the sixth annular channel 142 is located at the other end of the compressor axial direction. In this way, the distance between the fifth annular channel 141 and the sixth annular channel 142 can be increased, the flow path of carbon dioxide in the cooler can be increased, and the heat exchange effect of the precooler 140 can be improved.

In some embodiments of the present application, the precooler 140 may further include a cooler, which is used to cool the medium in the fifth annular channel 141 and the sixth annular channel 142. The cooler may be a liquid-cooled cooler or an air-cooled cooler.

In a specific implementation process, the cooler provides refrigerant (pressure is 0.101 standard atmospheric pressure, temperature is 25 degrees Celsius) to the precooler 140, and the cooler outputs the refrigerant after absorbing heat (pressure is 0.101 standard atmospheric pressure, temperature is 39.5 degrees Celsius).

Specifically, please continue to refer to Figure 8. The precooler 140 also includes a seventh annular channel 143 and an eighth annular channel 144 that are connected to each other. The seventh annular channel 143 is connected to the eighth annular channel 144. The seventh annular channel 143 is connected to the inlet of the cooler, and the eighth annular channel 144 is connected to the outlet of the cooler. Therefore, heat exchange is achieved between the connected seventh annular channel 143 and the eighth annular channel 144 and the connected fifth annular channel 141 and the sixth annular channel 142.

As shown in FIG. 8 , the flow direction of the carbon dioxide is opposite to that of the cooling medium, which can fully ensure sufficient heat exchange between the carbon dioxide and the cooling medium, thereby improving the cooling effect of the cooler 140 .

In some embodiments of the present application, the precooler 140 may further include a second conduction module 145 , which is formed by stacking a plurality of heat exchange fins, and the plurality of heat exchange fins may include a plurality of third heat exchange fins 146 and a plurality of fourth heat exchange fins 147 .

The third heat exchange fin 146 is provided with a third connecting groove 1461, one end of which is connected to the fifth annular channel 141, and the other end is connected to the sixth annular channel 142. The fourth heat exchange fin 147 is provided with a fourth connecting groove 1471, one end of which is connected to the seventh annular channel 143, and the other end is connected to the eighth annular channel 144. In this way, by providing the second conduction module 145, the seventh annular channel 143 and the eighth annular channel 144, the fifth annular channel 141 and the sixth annular channel 142 are connected respectively.

There may be a plurality of third connecting grooves 1461 on the third heat exchange fin 146 , and there may be a plurality of fourth connecting grooves 1471 on the fourth heat exchange fin 147 .

In a specific implementation process, the number of the third connecting grooves 1461 on the third heat exchange fin 146 can be five, ten, fifteen, twenty, etc.; the number of the second connecting grooves 1471 on the fourth heat exchange fin 147 can be five, ten, fifteen, twenty, etc.

In some embodiments of the present application, the second conduction module 145 is formed by the third heat exchange sheet 146 and the fourth heat exchange sheet 147 overlapping in sequence, that is, the third connecting groove 1461 and the fourth connecting groove 1471 are arranged at intervals. It should be noted that heat exchange is carried out between the carbon dioxide flowing through the third connecting groove 1461 and the carbon dioxide flowing through the fourth connecting groove 1471. In this way, the third heat exchange sheet 146 and the fourth heat exchange sheet 147 overlap in sequence, which can better ensure the heat exchange effect between the carbon dioxide flowing through the third connecting groove 1461 and the carbon dioxide flowing through the fourth connecting groove 1471, thereby improving the heat exchange effect of the precooler 140.

Specifically, please refer to Figure 8, the second conduction module 145 is located between the fifth annular channel 141 and the sixth annular channel 142, and the second conduction module 145 is located on the circumferential inner side of the seventh annular channel 143 and the eighth annular channel 144. In this way, while ensuring that the fifth annular channel 141 is connected to the sixth annular channel 142, and the seventh annular channel 143 is connected to the eighth annular channel 144, the integration between components is improved and the space occupied by the precooler 140 is reduced.

In some embodiments of the present application, there are multiple second conduction modules 145, and the multiple second conduction modules 145 are arranged at intervals in the circumferential direction of the compressor 150. In this way, during the flow of carbon dioxide in the fifth annular channel 141 and the sixth annular channel 142, and in the flow of carbon dioxide in the seventh annular channel 143 and the eighth annular channel 144, the number of heat exchange fins is increased, thereby increasing the heat exchange area and improving the heat exchange effect of the heat regenerator 120.

In a specific implementation process, the number of the second conduction modules 145 can be two, three, four, five, six, etc.

In some embodiments of the present application, the precooler 140 further includes a precooler 140 shell, which defines a receiving space, and the fifth channel, the sixth channel, the seventh channel, the eighth channel and the second conduction module 145 are all located in the receiving space of the precooler 140.

It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

The above description is only a specific embodiment of the present disclosure, so that those skilled in the art can understand or implement the present disclosure. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure will not be limited to the embodiments described herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A regenerative supercritical carbon dioxide brayton cycle system (100), comprising:

a heat source comprising a heating inlet and a heating outlet;

A turbine (130), the turbine (130) comprising a medium inlet (132), a medium outlet (133) and an output shaft (131), the medium inlet (132) being in communication with the heating outlet;

the heat regenerator (120) is arranged on the outer side of the circumference of the turbine (130) in a surrounding mode, the heat regenerator (120) comprises a first channel (124) and a second channel (125), the medium outlet (133) is communicated with the first channel (124), and the second channel (125) is communicated with the heating inlet;

-a precooler (140), said precooler (140) being in communication with said first passage (124);

The precooler (140) is arranged on the outer side of the periphery of the compressor (150), the compressor (150) comprises a compression inlet (151) and a compression outlet, the compression inlet (151) is communicated with the precooler (140), and the compression outlet is communicated with the second channel (125);

The generator (160), generator (160) with output shaft (131) are connected, output shaft (131) drive generator (160) electricity generation, generator (160) are used for driving compressor (150) operation.

2. The back-heating supercritical carbon dioxide brayton cycle system (100) of claim 1, wherein the first channel (124) comprises a first annular channel (1241) and a second annular channel (1242), one end of the first annular channel (1241) being in communication with the medium outlet (133) and the other end being in communication with the second annular channel (1242), the second annular channel (1242) being in communication with the precooler (140).

3. The back-heating supercritical carbon dioxide brayton cycle system (100) of claim 2, wherein the second channel (125) comprises a third annular channel (1243) and a fourth annular channel (1244), one end of the third annular channel (1243) being in communication with the compression outlet and the other end being in communication with the fourth annular channel (1244), the fourth annular channel (1244) being in communication with the heat source.

4. The regenerative supercritical carbon dioxide brayton cycle system (100) of claim 3, wherein the regenerator (120) further comprises a first conduction module (1245), the first conduction module (1245) being formed by a stack of a plurality of heat exchange sheets, the plurality of heat exchange sheets comprising a plurality of first heat exchange sheets (126) and a plurality of second heat exchange sheets (127);

The first heat exchange sheet (126) is provided with a first communication groove (1261), one end of the first communication groove (1261) is communicated with the first annular channel (1241), and the other end of the first communication groove is communicated with the second annular channel (1242);

the second heat exchange sheet (127) is provided with a second communication groove (1271), one end of the second communication groove (1271) is communicated with the third annular channel (1243), and the other end of the second communication groove is communicated with the fourth annular channel (1244).

5. The back-heating supercritical carbon dioxide brayton cycle system (100) of claim 4, wherein the first conduction module (1245) is formed by the first heat exchange sheet (126) and the second heat exchange sheet (127) overlapping in sequence.

6. The back-heating supercritical carbon dioxide brayton cycle system (100) of claim 5, wherein the number of the first conduction modules (1245) is a plurality.

7. The back-heating supercritical carbon dioxide brayton cycle system (100) of claim 1, wherein the precooler (140) comprises a fifth annular passage (141) and a sixth annular passage (142), the fifth annular passage (141) being in communication with the first passage (124) and the sixth annular passage (142) being in communication with the compression inlet (151).

8. The back-heating supercritical carbon dioxide brayton cycle system (100) of claim 7, wherein the precooler (140) comprises a cooler for cooling the medium within the fifth annular passage (141) and the sixth annular passage (142).

9. The back-heating supercritical carbon dioxide brayton cycle system (100) of claim 8, wherein the precooler (140) comprises a seventh annular passage (143) and an eighth annular passage (144) in communication, the seventh annular passage (143) in communication with the eighth annular passage (144), the seventh annular passage (143) in communication with an inlet of the cooler and the eighth annular passage (144) in communication with an outlet of the cooler.

10. The back-heating supercritical carbon dioxide brayton cycle system (100) of claim 9, wherein the precooler (140) further comprises a second conduction module (145), the second conduction module (145) being formed by a lamination of a plurality of heat exchange sheets including a plurality of third heat exchange sheets (146) and a plurality of fourth heat exchange sheets (147);

The third heat exchange sheet (146) is provided with a third communication groove (1461), one end of the third communication groove (1461) is communicated with the fifth annular channel (141), and the other end of the third communication groove is communicated with the sixth annular channel (142);

The fourth heat exchange sheet (147) is provided with a fourth communication groove (1471), one end of the fourth communication groove (1471) is communicated with the seventh annular channel (143), and the other end of the fourth communication groove is communicated with the eighth annular channel (144).