阅读说明：本技术 超临界二氧化碳再压缩循环发电系统及运行方法 (Supercritical carbon dioxide recompression cycle power generation system and operation method ) 是由 高骥 丁旭东 张军辉 刘象拯 马晓飞 杨雄民 毛汉忠 孔建强 谢永慧 于 2020-07-28 设计创作，主要内容包括：本申请涉及发电技术领域,尤其是涉及一种超临界二氧化碳再压缩循环发电系统及运行方法,本系统包括第一热交换路径、第二热交换路径、第一压缩路径、第二压缩路径、吸热路径、做功输出路径及回热路径,第一压缩路径与第二压缩路径并联设置并形成有同一输入端,且第一压缩路径经由回热路径与第二压缩路径相汇合并形成有同一输出端；第一热交换路径的输出端与同一输入端相连通,同一输出端与第二热交换路径的输入端相连通；第二热交换路径的输出端、吸热路径及做功输出路径的输入端顺次相连通；做功输出路径的输出端与第一热交换路径的输入端相连通,做功输出路径设置透平,其出口端与换热路径之间形成有设置透平旁路阀的流通旁路。(The system comprises a first heat exchange path, a second heat exchange path, a first compression path, a second compression path, a heat absorption path, a work-doing output path and a heat return path, wherein the first compression path and the second compression path are arranged in parallel and form a same input end, and the first compression path and the second compression path are converged through the heat return path and form a same output end; the output end of the first heat exchange path is communicated with the same input end, and the same output end is communicated with the input end of the second heat exchange path; the output end of the second heat exchange path, the heat absorption path and the input end of the work output path are communicated in sequence; the output end of the work-applying output path is communicated with the input end of the first heat exchange path, the work-applying output path is provided with a turbine, and a circulation bypass provided with a turbine bypass valve is formed between the output end of the work-applying output path and the heat exchange path.)

1. A supercritical carbon dioxide recompression cycle power generation system, comprising: the heat exchanger comprises a heat exchange path, a first compression path, a second compression path, a heat absorption path, a work applying output path and a heat return path; wherein the heat exchange path includes a first heat exchange path and a second heat exchange path; the first compression path and the second compression path are arranged in parallel and form the same input end, and the first compression path and the second compression path are converged through the heat return path and form the same output end;

the output end of the first heat exchange path is communicated with the same input end, and the same output end is communicated with the input end of the second heat exchange path; the output end of the second heat exchange path, the heat absorption path and the input end of the work-doing output path are communicated in sequence; the output end of the working output path is communicated with the input end of the first heat exchange path;

the working output path is provided with a turbine, a circulation bypass is formed between the outlet end of the turbine and the heat exchange path, and the circulation bypass is provided with a turbine bypass valve.

2. The supercritical carbon dioxide recompression cycle power generation system as recited in claim 1, wherein the endothermic path is provided with a heater and a turbine throttle valve is provided between an outlet of the heater and an inlet of the turbine.

3. The supercritical carbon dioxide recompression cycle power generation system as claimed in claim 1, wherein any one of the heat exchange path, the first compression path, the second compression path, the endothermic path, the work output path, and the regenerative path is connected to an external air source through a supplemental regulating valve.

4. The supercritical carbon dioxide recompression cycle power generation system as claimed in claim 3, wherein the first compression path is coupled to the external gas source via the supplemental regulator valve.

5. The supercritical carbon dioxide recompression cycle power generation system as claimed in claim 1, wherein the first compression path is provided with a main compressor with a first anti-surge control valve connected in parallel between an inlet and an outlet of the main compressor.

6. The supercritical carbon dioxide recompression cycle power generation system as claimed in claim 5, wherein the first compression path is provided with a cooler, and the cooler is provided upstream of the main compressor in a direction of circulation of the medium;

and flow regulating devices are arranged in parallel at the inlet end of the cooler and the outlet end of the main compressor.

7. The supercritical carbon dioxide recompression cycle power generation system as claimed in claim 6, wherein the flow regulating device comprises an inlet regulating valve, a storage device, and an outlet regulating valve in serial communication, and wherein the inlet regulating valve is further in communication with the outlet port of the main compressor and the outlet regulating valve is further in communication with the inlet port of the cooler.

8. The supercritical carbon dioxide recompression cycle power generation system as claimed in claim 1, wherein the second compression path is provided with a flow dividing regulation valve and a recompressor, and the flow dividing regulation valve is provided upstream of the recompressor in a direction of circulation of the medium; a second anti-surge control valve is connected in parallel between the inlet and outlet ends of the recompressor.

9. The supercritical carbon dioxide recompression cycle power generation system as claimed in any one of claims 1 to 8, wherein the heat exchange path is provided with a high temperature regenerator and a low temperature regenerator; the low-pressure input end of the high-temperature regenerator is communicated with the output end of the turbine, the low-pressure output end of the high-temperature regenerator is communicated with the low-pressure input end of the low-temperature regenerator, and the low-pressure output end of the low-temperature regenerator is communicated with the same input end shared by the first compression path and the second compression path to form the first heat exchange path;

the same output end shared by the first compression path and the second compression path is communicated with a high-pressure input end of the high-temperature heat regenerator to form a second heat exchange path;

and a high-temperature regenerator bypass regulating valve is connected in parallel between the inlet end and the outlet end of the high-temperature regenerator.

10. An operation method of a supercritical carbon dioxide recompression cycle power generation system, which is applied to the supercritical carbon dioxide recompression cycle power generation system according to claim 2, characterized by comprising the steps of:

when the supercritical carbon dioxide recompression cycle power generation system is in load reduction operation, the rotating speed of each rotating component is unchanged, the turbine bypass valve is opened, and the valve port of the turbine throttle valve is gradually closed, so that a part of working medium flows to the outlet end of the turbine through the circulation bypass and is mixed with the exhaust gas of the turbine; when the supercritical carbon dioxide recompression cycle power generation system is operated under a load-increasing condition, the rotating speed of each rotating component is unchanged, the turbine bypass valve is closed, and the valve port of the turbine throttle valve is gradually enlarged, so that the working medium does not pass through the circulation bypass and directly flows through the turbine, and variable working condition control is completed.

Technical Field

The application relates to the technical field of power generation, in particular to a supercritical carbon dioxide recompression cycle power generation system and an operation method.

Background

At present, the supercritical carbon dioxide Brayton cycle is taken as a leading-edge power generation technology, has wide engineering application prospects in the fields of thermal power, nuclear power, ship power, solar power generation and the like, but the following key problems mainly exist in the design of a power generation system taking the supercritical carbon dioxide as a working medium: because of closed circulation, the flow, the rotational speed, the pressure of rotary machine usually have the coupling relation, consequently hardly adjust the running state of single part, increased each rotating part matching operation's under the system variable operating mode complexity, current supercritical carbon dioxide brayton cycle system can't carry out self-adjustment to the operating mode of load change fast promptly.

Disclosure of Invention

The application aims to provide a supercritical carbon dioxide recompression cycle power generation system and an operation method, and the technical problem that a supercritical carbon dioxide Brayton cycle system in the prior art cannot be self-adjusted rapidly according to the working condition of load change is solved to a certain extent.

The application provides a supercritical carbon dioxide recompression cycle power generation system, includes: the heat exchanger comprises a heat exchange path, a first compression path, a second compression path, a heat absorption path, a work applying output path and a heat return path; wherein the heat exchange path includes a first heat exchange path and a second heat exchange path; the first compression path and the second compression path are arranged in parallel and form the same input end, and the first compression path and the second compression path are converged through the heat return path and form the same output end;

the output end of the first heat exchange path is communicated with the same input end, and the same output end is communicated with the input end of the second heat exchange path; the output end of the second heat exchange path, the heat absorption path and the input end of the work-doing output path are communicated in sequence; the output end of the working output path is communicated with the input end of the first heat exchange path;

the working output path is provided with a turbine, a circulation bypass is formed between the outlet end of the turbine and the heat exchange path, and the circulation bypass is provided with a turbine bypass valve.

In the above technical solution, further, the heat absorption path is provided with a heater, and a turbine throttle valve is arranged between an outlet end of the heater and an inlet end of the turbine.

In any of the above technical solutions, further, any one of the heat exchange path, the first compression path, the second compression path, the heat absorption path, the work output path, and the heat regeneration path is communicated with an external air source through a supplementary regulating valve.

In any of the above technical solutions, further, the first compression path is communicated with the external air source through the supplementary regulating valve.

In any of the above technical solutions, further, the first compression path is provided with a main compressor, and a first anti-surge control valve is connected in parallel between an inlet end and an outlet end of the main compressor.

In any one of the above aspects, further, a cooler is provided in the first compression path, and the cooler is provided upstream of the main compressor along a flow direction of the medium;

and flow regulating devices are arranged in parallel at the inlet end of the cooler and the outlet end of the main compressor.

In any of the above technical solutions, further, the flow regulating device includes an inlet regulating valve, a storage device, and an outlet regulating valve that are sequentially communicated, and the inlet regulating valve is further communicated with the outlet end of the main compressor, and the outlet regulating valve is further communicated with the inlet end of the cooler.

In any of the above technical solutions, further, the second compression path is provided with a flow dividing regulating valve and a recompressor, and the flow dividing regulating valve is disposed upstream of the recompressor along a flow direction of the medium; a second anti-surge control valve is connected in parallel between the inlet and outlet ends of the recompressor.

In any of the above technical solutions, further, the heat exchange path is provided with a high-temperature heat regenerator and a low-temperature heat regenerator; the low-pressure input end of the high-temperature regenerator is communicated with the output end of the turbine, the low-pressure output end of the high-temperature regenerator is communicated with the low-pressure input end of the low-temperature regenerator, and the low-pressure output end of the low-temperature regenerator is communicated with the same input end shared by the first compression path and the second compression path to form the first heat exchange path;

the same output end shared by the first compression path and the second compression path is communicated with a high-pressure input end of the high-temperature heat regenerator to form a second heat exchange path;

and a high-temperature regenerator bypass regulating valve is connected in parallel between the inlet end and the outlet end of the high-temperature regenerator.

The application also provides an operation method, which is applied to the supercritical carbon dioxide recompression cycle power generation system in any technical scheme, and comprises the following steps:

when the supercritical carbon dioxide recompression cycle power generation system is in load reduction operation, the rotating speed of each rotating component is unchanged, the turbine bypass valve is opened, and the valve port of the turbine throttle valve is gradually closed, so that a part of working medium flows to the outlet end of the turbine through the circulation bypass and is mixed with the exhaust gas of the turbine; when the supercritical carbon dioxide recompression cycle power generation system is operated under a load-increasing condition, the rotating speed of each rotating component is unchanged, the turbine bypass valve is closed, and the valve port of the turbine throttle valve is gradually enlarged, so that the working medium does not pass through the circulation bypass and directly flows through the turbine, and variable working condition control is completed.

Compared with the prior art, the beneficial effect of this application is:

in the supercritical carbon dioxide recompression cycle power generation system that this application provided, can realize the power variation through the flow that circulation bypass control got into in the turbine when becoming the load, match actual power generation needs for this system's application scope is wider, in addition, has reduced each rotary part of system and has matchd the complexity of operation under the variable operating mode, and then has also reduced each rotary part's fault rate.

The operation method provided by the application is applied to the supercritical carbon dioxide recompression cycle power generation system, so that corresponding adjustment can be made for variable load, the actual power generation needs can be matched, the application range of the system is wider, in addition, the complexity of matching and operation of all rotating parts of the system under variable working conditions is reduced, and further the fault rate of all rotating parts is also reduced.

Drawings

In order to more clearly illustrate the detailed description of the present application or the technical solutions in the prior art, the drawings needed to be used in the detailed description of the present application or the prior art description will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic structural diagram of a supercritical carbon dioxide recompression cycle power generation system according to an embodiment of the present application.

Reference numerals:

1-heater, 2-turbine, 3-turbine throttle valve, 4-turbine bypass valve, 5-main compressor, 6-first anti-surge control valve, 7-inlet regulating valve, 8-outlet regulating valve, 9-storage device, 10-cooler, 11-cooler bypass valve, 12-supplemental regulating valve, 13-shunt regulating valve, 14-second anti-surge control valve, 15-generator, 16-clutch, 17-high speed motor, 18-recompressor, 19-gear box, 20-low temperature regenerator, 21-high temperature regenerator, 22-high temperature regenerator bypass regulating valve, 23-outside air source, 100-first heat exchange path, 200-second heat exchange path, 300-regenerative path, 400-first compression path, 500-second compression path, 600-work output path, 700-heat absorption path, 800-same input terminal, 900-same output terminal.

Detailed Description

The technical solutions of the present application will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are only some embodiments of the present application, but not all embodiments.

The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the 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.

In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

A supercritical carbon dioxide recompression cycle power generation system and method of operation according to some embodiments of the present application is described below with reference to fig. 1.