DIMENSIONLESS ANALYSIS OF PRESSURE DROP AND HEAT TRANSFER ON HTGR COUPLED WITH CLOSED BRAYTON CYCLE
High temperature gas-cooled reactor with direct helium turbine cycle is based on the closed Brayton cycle. Its outstanding feature is the high efficiency of power generation. Pervious researches showed that recuperator was the key component to promote the cycles efficiency. And pressure drops in components were unavoidable in actual projects and had significant influence on cycle efficiency. A dimensionless model was proposed to analyze cycles features of HTGR coupled with gas turbine. The parameters’ effect on cycles efficiency was analyzed, with full consideration of the frictional and local pressure drops respectively. Under the restriction of materials and state-of-art of technologies, showed that the cycles efficiency depended on compression ratio, recuperators effectiveness and pressure drops components. However the pressure drop ratios of different components were inherently connected due to the closed cycle. Furthermore pressure drops inside the recuperator were also the function of effectiveness of the heat transfer based on the Reynolds analogy. Therefore cycles efficiency just depended on recuperators effectiveness with fixed compression ratio. So there existed optimal recuperators effectiveness and maximum cycles efficiency, which varied with the pressure ratio and other parameters as temperature ratio. The calculation also indicated that the pressure drop in pipes was close to that in heat exchangers. That was, the local pressure drop and frictional pressure drop should be considered respectively, and the local pressure drop made quite large reduction of cycles efficiency. The result also showed that local pressure drop had great influence on parameters such as optimal compression ratio and recuperators effectiveness.
Zhenjia Yu Xiaoyong Yang Xiaoli Yu Jie Wang
Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing,100084, China Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing, 100084, China Institute of Nuclear and new Energy Technology, Tsinghua University,Beijing,100084, China
国际会议
18th International Conference on Nuclear Engineering(第18届国际核能工程大会 ICONE 18)
西安
英文
1-9
2010-05-17（万方平台首次上网日期，不代表论文的发表时间）