| In the field of nuclear power,high temperature gas cooled reactor(HTGR)is a supplement to other reactor types such as pressurized water reactor(PWR).It is an advanced reactor with the characteristics of 4th generation nuclear power system,with inherent safety,high power generation efficiency,simple system,wide application and so on.China is currently in a leading position in the research field of HTGR technology in the world.The experimental power station of HTGR has been built,and the world's first modular pebble bed high-temperature gas-cooled reactor demonstration power station HTR-PM is being built to realize the transformation of the high-temperature gas-cooled reactor from an experimental reactor to a commercial reactor.However,steam turbine cycle is used to generate power in HTR-PM,the advantage of high outlet temperature of high temperature gas cooled reactor can not be brought into full play.Therefore,it is necessary to carry out research on commercial high temperature gas cooled reactor with helium turbine cycle power generation which can take advantage of the high temperature advantages of the HTGR outlet.In this paper,the thermohydraulic design of helium cooling loop for commercial HTGR is presented.Based on the requirements of inlet and outlet parameters,generation system parameters of commercial HTGR with core thermal power of 250MW and the space requirements of helium cooling loop,the thermohydraulic design of HTGR helium cooling loop is carried out in this paper.The main contents of the research include:the design of thermohydraulic scheme of helium cooling loop,the design of heat exchangers,and the simulation of heat exchangers.The results of the study are:(1)According to the function to be realized,the flow of helium cooling loop of HTGR is determined.The closed loop based on Brayden cycle model can be used in HTGR helium cooling loop.The flow chart of helium cooling loop designed based on the cycle model can meet the function of the loop by realizing heat transfer of HTGR core and drive power generation system.(2)According to the design input parameters and the circuit flow,the main thermal parameters of the circuit are designed.After checking,the cycle efficiency of the loop can reach the design requirements under the designed thermal parameters.(3)According to the design results of the thermal parameters and space requirements of the heat exchangers in the loop,the heat exchangers which meet the design requirements are obtained,and the design of the thermal parameters of the heat exchangers in the loop is verified to be reasonable.The heat transfer area(heat transfer power)and the flow resistance of the heat exchangers are obtained by selecting the appropriate structure type and the structural size of the heat exchangers.After accounting,they meet the requirements of the thermal parameters of the heat exchangers,so the reasonable design of the thermal parameters of the heat exchangers in the loop is verified.(4)According to the design results of the heat exchangers,the flow and heat transfer of the heat exchanger are analyzed,and the simulation results of pressure drop and heat transfer power that meet the requirements are obtained.The results show that the design results of the heat exchangers are relatively reasonable.It is also verified that the design of the thermal parameters of the heat exchangers in the loop is reasonable.(5)The structure of the heat exchangers in the loop is reasonable.When the precooler and the intermediate cooler adopt the spiral winding tube heat exchanger and the regenerator adopt the plate-fin heat exchanger,the thermal parameters of each heat exchanger can be met by reasonable design.(6)The design and simulation of heat exchangers verify that the design of thermal parameters of the heat exchangers is reasonable,and the design of thermal parameters is based on helium cooling loop,therefore,the rationality of the flow design of helium cooling loop is also verified. |
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