摘要
Abstract
The pinch point problem of recuperator on supercritical carbon dioxide Brayton recompression cycle was studied. Then,the effect of the pinch point on the thermal efficiency,specific work output, irreversible exergy losses,and exergy efficiency of supercritical carbon dioxide Brayton recompression cycle was analyzed; and the effect of the inlet temperature of turbine and pressure ratio on supercritical carbon dioxide brayton recompression cycle was discussed. The simple regenerative cycle and the recompression cycle was coampared. The results showed that,with the increase of the spilt ratio,the pinch point first appeared at the outlet of low temperature side of the low temperature recuperator,then at the inside,finally at the inlet. A minimum split ratio existed for the given initial conditions. The thermal efficiency and the exergy efficiency first increased with the rise of split ratio,and then decreased. The split ratio had a great effect on the exergy losses of heater,low temperature recuperator,cooler,and high temperature recuperator. Increasing of the pressure ratio and the inlet temperature of turbine decreased the minimum split ratio of recompression cycle. Furthermore,within a certain range of split ratios,the thermal efficiency of recompression cycle was higher than that of the simple regenerative cycle.关键词
夹点/超临界二氧化碳/布雷顿循环/优化/热力学Key words
pinch point/supercritical carbon dioxide/brayton cycle/optimization/thermodynamics分类
能源科技
