DEMO Blanket Module Design And Research On Flow And Heat Transfer Characteristics

Fusion energy is a strategic energy plan for sustainable human development in the future.The construction of the International Thermonuclear Experimental Reactor(ITER)indicates that this technology has entered a critical stage of implementation.DEMO reactor is the goal from ITER to the next stage.The most critical technology from the ITER project to the DEMO fusion reactor is the development of the blanket module.Its main function is to multiply and transfer high heat.In this paper,neutronics,thermal-hydraulic analysis and flow and heat transfer were researched for DEMO blanket module of China.This paper proposes the conceptual design of DEMO blanket module based on the design of Chinese ITER TBM,and three-dimensional modeling of blanket module component are built.Neutronics analysis of the fusion reactor and DEMO blanket module,and based on this,the dimensions of the blanket module,the proportion of internal materials,the first wall thickness,and the ratio of antimony increase the impact and the selection of a reasonable optimization program.After completion of the neutronics analysis,the blanket module was subjected to thermal-hydraulic analysis.First,the calculation of the post-stack plate shows that the inlet flow distribution of the first wall is not uniform,and the uniformity is effectively improved by means of built-in ribs.Then the influence of the inlet flow on the cooling effect of the first wall was studied,and it was found that the existing inlet flow could not meet the cooling requirements and the import flow needed to be increased.For the highest temperature occurs on the outside of the corner,the flow path at the corner is tapered to reduce heat build-up at the corner.In addition,by replacing the ring flow passage with a longitudinal flow passage,the heat transfer performance of the first wall inner flow passage can also be effectively improved.All these influencing factors must be comprehensively considered to determine the overall cooling scheme of the blanket module in order to ensure the safety of the structure.In order to verify the accuracy of the simulation data,the first wall flow channel heat transfer performance device of the blanket module was built,and the heat transfer performance of the first wall flow path of the blanket was experimentally studied,and different diameters and shapes were obtained.The influence of different Reynolds number,different inlet air temperature and different pressure on the heat transfer performance of the first wall flow channel,and an optimized heat transfer optimization scheme was proposed.Based on the principle of steady-state heat conduction,an equivalent thermal conductivity measuring device for pebble bed using an external heating method was designed and constructed,and an effective thermal conductivity test for the pebble bed was conducted.The effective thermal conductivity of different diameters and stacking types of p pebble beds at different temperatures was measured experimentally to obtain relevant thermal conductivity data.