Closed Brayton cycle load regulation control system based on filling and recycling of working medium

Abstract

The invention relates to a closed Brayton cycle load regulation control system based on working medium filling and recovery, a control tank is arranged in the system, the control tank is respectively connected with the high-pressure side and the low-pressure side of a cycle system through pipelines, a high-pressure connecting point is arranged at an outlet of a compressor, and a low-pressure connecting point is arranged at an inlet of a cooler; and a valve for adjustment is arranged on each connecting pipeline. The method can be used for adjusting and controlling the output power of the Brayton cycle power generation system, and has the characteristic of high system cycle heat efficiency; the carbon dioxide consumption and the emission to the external environment of the Brayton cycle power generation system can be reduced, the operation cost is reduced, and the requirement of sustainable development is met; the load can be efficiently adjusted, the system pressure is kept stable, the energy utilization efficiency is improved, and resource waste is reduced.

Description

Technical Field

[0001] The present invention relates to a closed Breton cycle power generation system, especially a power generation system that uses supercritical carbon dioxide as a working fluid, and belongs to the energy field. Background Art

[0002] The closed Brayton cycle power generation system is a technology that uses high pressure and high temperature to turn carbon dioxide and other working fluids into supercritical fluids, and in this state, drives a generator through a turbine to generate electricity. It has the advantages of high efficiency, low carbon emissions, high temperature and high pressure cycle and strong adaptability, and is expected to become an important clean energy power generation method in the future.

[0003] There are many problems to be solved in the load regulation method of traditional closed Brayton cycle power generation system. For example, turbine inlet valve throttling and bypass valve adjustment are often accompanied by large energy losses, resulting in reduced cycle efficiency; while load regulation methods such as turbine inlet working fluid temperature parameters will cause changes in the overall pressure in the circulation system, leading to system instability and other problems.

[0004] At the same time, since the Brayton cycle power generation system is a closed circulation system, when the quality of the working fluid in the circulation system is constant, changes in the temperature and pressure parameters at any point in the circulation system will cause changes in the entire system. In a closed Brayton cycle power generation system, in order to maintain the stable operation of the power generation system, it is necessary to set a constant pressure point in the system. During the operation of the system, the pressure at this point needs to be maintained at the required design value. The compressor inlet is usually selected as the pressure control point of the closed Brayton cycle system. In order to maintain the stability of the inlet pressure of the Brayton cycle system compressor, it is usually necessary to change the quality of the working fluid in the circulation system. At this time, it is necessary to frequently flush the working fluid into the circulation system or discharge the working fluid, resulting in huge waste.

[0005] Therefore, it is necessary to propose a closed Brayton cycle load regulation control system based on working fluid filling and recovery to achieve output power regulation of the closed Brayton cycle power generation system while maintaining the pressure stability of the power generation system. Summary of the invention

[0006] In order to solve the above technical problems, the present invention proposes a closed Brayton cycle load regulation control system based on working fluid filling and recovery, which improves the system efficiency of the Brayton cycle system and increases the operating stability of the cycle system.

[0007] To achieve the above-mentioned purpose, the technical solution of the present invention is: a closed Brayton cycle load regulation control system based on working fluid filling and recovery, in which a control tank is arranged, and the control tank is connected to the high-pressure side and the low-pressure side of the circulation system through pipelines, wherein the high-pressure connection point is arranged at the compressor outlet, and the low-pressure connection point is arranged at the cooler inlet, and a valve for adjustment is arranged on each connecting pipeline.

[0008] Furthermore, the closed Brayton cycle load regulation control system based on working fluid filling and recovery can control and adjust the pressure at the compressor inlet by opening and closing the valve on the pipeline connected to the control tank, and can change the volume flow rate of the working fluid at the compressor inlet, thereby changing the compressor outlet pressure and the working fluid mass flow rate of the circulation system, and thus changing the output power of the turbine, thereby realizing closed Brayton cycle load regulation control.

[0009] Furthermore, the control tank is connected to the compressor outlet and the cooler inlet, and a regulating valve is arranged on the connecting pipeline. According to the setting of the power generation system control logic, the circulating working fluid is discharged from the compressor outlet into the control tank to reduce the working mass of the circulating system, or the circulating working fluid is injected from the control tank into the cooler to increase the working mass of the circulating system.

[0010] Furthermore, by changing the working fluid mass flow rate in the circulation system, the pressure value in the control system reaches the designed pressure value, and then the output power of the power generation system is changed.

[0011] The beneficial effects of the present invention are:

[0012] A closed Breton cycle load regulation control system based on working fluid filling and recycling of the present invention has the following advantages:

[0013] 1. It can be used to adjust and control the output power of the Breton cycle power generation system, and has the characteristics of high system circulation thermal efficiency.

[0014] 2. It can reduce the carbon dioxide consumption and emissions to the external environment of the Breton cycle power generation system, reduce operating costs, and meet the requirements of sustainable development.

[0015] 3. The system can efficiently adjust the load and maintain system pressure stability to improve energy utilization efficiency and reduce resource waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a closed Breton cycle load regulation control system diagram based on working fluid filling and recycling of the present invention;

[0017] Figure 2 This is a simple heat recovery cycle application case diagram. DETAILED DESCRIPTION

[0018] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0019] like Figure 1As shown, the closed Brayton cycle load regulation control system based on working fluid filling and recovery of the present invention, a control tank 1 is provided in the system, and the control tank 1 is connected to the high-pressure side and the low-pressure side of the circulation system through pipelines, wherein the high-pressure connection point is preferably provided at the outlet of the compressor 2, and the low-pressure connection point is preferably provided at the inlet of the cooler 3, and a valve for regulation is provided on each connecting pipeline.

[0020] The system can inject the working fluid in the circulation system into the control tank or inject the working fluid in the control tank into the circulation system by switching the valves (charging valve 4, exhaust valve 5) on the pipeline connected to the control tank. In this way, the pressure of the compressor inlet can be controlled and adjusted, and the compressor outlet pressure and the working fluid mass flow of the circulation system can be changed by changing the volume flow of the compressor inlet working fluid, thereby changing the output power of the turbine and achieving the purpose of closed Brayton cycle load regulation control. In this way, the throttling loss caused by the use of the turbine inlet regulating valve for power regulation can be avoided, thereby improving the power generation efficiency of the system.

[0021] Examples of applications of the present invention include Figure 2 As shown, a control tank is set in a Brayton cycle power generation system with a simple regenerative cycle. The control tank is connected to the compressor outlet and the cooler inlet. A regulating valve is set on the connecting pipeline. According to the setting of the power generation system control logic, the circulating working fluid is discharged from the compressor outlet into the control tank to reduce the working mass of the circulating system, or the circulating working fluid is injected from the control tank to the cooler to increase the working mass of the circulating system. Through the change of the working fluid mass flow in the circulating system, the pressure value in the control system can be controlled to reach the design pressure value, thereby changing the output power of the power generation system.

Claims

1. A closed Brayton cycle load regulation control system based on working fluid filling and recovery, characterized in that: A control tank is provided in the system, which is connected to the high-pressure side and the low-pressure side of the circulation system through pipelines, wherein the high-pressure connection point is provided at the compressor outlet, the low-pressure connection point is provided at the cooler inlet, and a valve for adjustment is provided on each connecting pipeline.

2. The closed Brayton cycle load regulation control system based on working fluid filling and recovery according to claim 1 is characterized in that: The closed Brayton cycle load regulation control system based on working fluid filling and recovery can control and adjust the pressure of the compressor inlet by opening and closing the valve on the pipeline connected to the control tank, and can change the volume flow of the working fluid at the compressor inlet, thereby changing the compressor outlet pressure and the working fluid mass flow of the circulation system, and then changing the output power of the turbine, thereby realizing closed Brayton cycle load regulation control.

3. The closed Brayton cycle load regulation control system based on working fluid filling and recovery according to claim 1 is characterized in that: The control tank is connected to the compressor outlet and the cooler inlet, and a regulating valve is arranged on the connecting pipeline. According to the setting of the power generation system control logic, the circulating working fluid is discharged from the compressor outlet into the control tank to reduce the working mass of the circulating system, or the circulating working fluid is injected from the control tank into the cooler to increase the working mass of the circulating system.

4. The closed Brayton cycle load regulation control system based on working fluid filling and recovery according to claim 3 is characterized in that: By changing the mass flow rate of the working fluid in the circulation system, the pressure value in the control system can reach the designed pressure value, thereby changing the output power of the power generation system.

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