Heat Recuperation for the Self-Condensing CO_(2)Transcritical Power Cycle  

作　　者：PAN Lisheng SHI Weixiu SUN Yin SUN Yiwei WEI Xiaolin 

机构地区：[1]State Key Laboratory of High-temperature Gas Dynamics,Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190,China [2]School of Environment and Energy Engineering,Beijing University of Civil Engineering and Architecture,Beijing 100044,China

出　　处：《Journal of Thermal Science》2024年第5期1630-1641,共12页热科学学报（英文版）

基　　金：Projects 51776215 and 12372237 supported by National Natural Science Foundation of China。

摘　　要：The supercritical CO_(2)Brayton cycle has potential to be used in electricity generation occasions with its advantages of high efficiency and compact structure.Focusing on a so-called self-condensing CO_(2)transcritical power cycle,a model was established and four different layouts of heat recuperation process were analyzed,a without-recuperation cycle,a post-recuperation cycle,a pre-recuperation cycle and a re-recuperation cycle.The results showed that the internal normal cycle's share of the whole cycle increases with increasing the cooling pressure and decreasing the final cooled temperature.Heat load in the supercritical heater decreases with increasing the cooling pressure.From perspective of performance,the re-recuperation cycle and the pre-recuperation cycle have similar thermal efficiency which is much higher than other two layouts.Both thermal efficiency and net power output have a maximum value with the cooling pressure,except in the condition with the final cooled temperature of 31℃.Considering both the complexity and the economy,the pre-recuperation cycle is more applicable than the other options.Under 35℃of the final cooled temperature,the thermal efficiency of the pre-recuperation cycle reaches the peak 0.34 with the cooling pressure of 8.4 MPa and the maximum net power output is 2355.24 kW at 8.2 MPa of the cooling pressure.

关 键 词：CO_(2)transcritical power cycle heat recuperation process self-condensing 

分 类 号：TK115[动力工程及工程热物理—热能工程]