Preliminary Design And Study Of Primary Heat Transfer System For CFETR Water-Cooled Breeder Blanket

As an efficient and clean energy,fusion energy is one of the ideal energy sources at present,which can effectively meet the demand for energy and protect the environment.Chinese Fusion Engineering Testing Reactor(CFETR)is the next device in the roadmap to realize fusion energy in China,which aims to bridge the gap between International Thermonuclear Experimental Reactor(ITER)and future fusion demonstration reactor.The primary objectives of CFETR are demonstrating fusion energy production,tritium self-sufficiency long pulse or steady-state operation.It will operate in two phases:Phase Ⅰ focuses on a modest fusion power of up to 200 MW,while Phase Ⅱ aims for DEMO validation with a fusion power of 1.5 GW.The water-cooled ceramic breeder blanket is one of the candidate concepts for CFETR,and it shoulders the responsibility of tritium production and energy conversion.The Primary Heat Transfer System(PHTS)is responsible for removing the nuclear heat deposited inside blanket modules and delivering it to the turbines to generate electricity.Concerning the PHTS based on water-cooled ceramic breeder,when the system is in steady state operation at each phase,it is necessary to ensure that the thermal-hydraulics parameters of the system operate within a reasonable range,so that the heat of the blanket is used for power generation.The research on thermal hydraulics design and safety of PHTS of water-cooled ceramic breeder blanket is of great significance for the efficient power generation and the safe operation of CFETR.Targeting the two phases’ operation of CFETR,the thermal hydraulics design principle and operation scheme of the PHTS were proposed.The design principle is using one set of system to operate at two different fusion powers.Taking into account the pulse working principle of CFETR,this paper completed the design of PHTS and divided it into two independent subsystems,which provide cooling for the breeder zone(BZ)and the first wall(FW).The heat transferred from the BZ PHTS is sent to the steam turbine to generate electricity through the steam generator(SG),and the heat transferred by FW PHTS is transferred to the intermediate heat transfer system(IHTS)through the intermediate heat exchanger(IHX)for storage,and the stored heat is released during the dwell time.Based on the larger power of 1.5GW fusion power,the preliminary design of the PHTS spatial layout,main pipeline,SG,IHX,main pump and pressurizer was carried out.On the basis of the CFETR PHTS designed in this paper,a BOP(Balance Of Plant)system model is established by using Ebsilon software to simulate the steady state operation state of the BOP system in two fusion power operation stages.The BOP system is composed of PHTS,IHTS and PCS(Power Conversion System).The simulation result of BOP system verified that the design scheme can effectively eliminate the influence of periodic power load on the components of the power conversion system,and ensure the continuous and stable heat power transfer to the PCS.In this thesis,the thermal hydraulic design of water-cooled breeder blanket PHTS and the demonstration of fusion power generation were carried out for the two-phase operation of CFETR.The relevant research results will help to understand and optimize the design of the CFETR PHTS under multi-power operation.Figure[33]table[14]reference[80]...