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Supercritical carbon dioxide Brayton cycle system control method

A carbon dioxide, circulating system technology, applied in steam engine installations, solar thermal power generation, machines/engines, etc., can solve problems such as high cost, large storage tank size, and many auxiliary equipment, achieving low redundancy and high system reliability. , to achieve the effect of stable operation

Active Publication Date: 2022-08-05
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0016] The technical problem to be solved by the present invention is to provide a supercritical carbon dioxide Brayton cycle system control method to overcome the stock control intermediate storage Disadvantages of large tank size, many auxiliary equipment and high cost

Method used

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  • Supercritical carbon dioxide Brayton cycle system control method
  • Supercritical carbon dioxide Brayton cycle system control method
  • Supercritical carbon dioxide Brayton cycle system control method

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Embodiment

[0074] When the supercritical carbon dioxide circulation system works under the design conditions, the speed is 30000rpm and the output power is 150KW. It is assumed that due to the increase of the heat source power, the turbine inlet temperature rises by 20K within 10s. Under the action of the control strategy proposed by the present invention, the supercritical The changes of parameters in the carbon dioxide cycle system are as follows: image 3 shown.

[0075] When the power of the heat source 2 causes the turbine inlet temperature to rise, the active torque of the system is higher than the reverse torque, resulting in a deviation between the load and the power, the balance of the rotor is destroyed, and the rotational speed tends to increase. Under the action of the module, the valve opening of the first bypass valve 13 is increased, the flow rate of carbon dioxide entering the turbine 3 is reduced, the net output power of the system is reduced, a new rotor balance relatio...

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Abstract

The invention discloses a supercritical carbon dioxide Brayton cycle system control method which is characterized in that a first regulating valve is arranged between a turbine and a heat source, the turbine is connected with the turbine through the hot side of a heat regenerator, a cooler, a throttle valve, a compressor, the cold side of the heat regenerator and the heat source in sequence, and the compressor is connected with a motor; a first bypass valve is arranged on a bypass pipeline of the turbine and the heat source; a second bypass valve is arranged on a bypass pipeline of the cooler and the compressor; a second regulating valve is arranged on the cold side of the cooler; when the system is started, the motor drives the compressor to work; when the system operates stably, the motor provides power as a generator; the output power, the rotating speed, the compressor inlet temperature and the compressor inlet pressure in the supercritical carbon dioxide Brayton cycle system are adjusted by adjusting the first bypass valve, the first adjusting valve, the second adjusting valve, the second bypass valve and the throttling valve correspondingly. The control method disclosed by the invention can be stably operated under various fluctuation scenes, the redundancy required by equipment is small, and the system reliability is high.

Description

technical field [0001] The invention belongs to the technical field of thermal power generation, and in particular relates to a control method for a supercritical carbon dioxide Brayton cycle system. Background technique [0002] The supercritical carbon dioxide Brayton cycle can be applied to various heat source environments such as solar energy, nuclear energy, coal combustion, waste heat, etc. due to its high efficiency, small system size, and low noise. Therefore, it is very important to study the technology of supercritical carbon dioxide Brayton cycle system. meaning. [0003] The operation and control of supercritical carbon dioxide Brayton cycle system should pay attention to the following key issues: [0004] 1) Since the supercritical carbon dioxide Brayton cycle system is a closed cycle, the change of any parameter during the operation of the system will have a significant impact on other parameters of the system; [0005] 2) Since the design of supercritical ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01K13/00F01K13/02F01K7/32F01K25/10F01K21/00F01D15/10
CPCF01K13/00F01K13/02F01K7/32F01K25/103F01K21/00F01D15/10Y02E10/46
Inventor 王江峰王传栋娄聚伟程梓洋赵攀
Owner XI AN JIAOTONG UNIV
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