基于简单回热循环的超临界二氧化碳离心压缩机  

Supercritical Carbon Dioxide Centrifugal Compressor Based on Simple Regenerative Cycle

作　　者：赵峰 刘桃宏 张伟[1] ZHAO Feng;LIU Taohong;ZHANG Wei(Shanghai Marine Equipment Research Institute,Shanghai 200031,China)

机构地区：[1]上海船舶设备研究所,上海200031

出　　处：《机电设备》2024年第6期86-91,共6页Mechanical and Electrical Equipment

摘　　要：作为限制超临界二氧化碳发电技术发展瓶颈的关键因素,高效的循环结构形式和关键设备研究是目前亟待解决的重要课题。根据某型百千瓦级超临界二氧化碳布雷顿循环发电系统设计要求,搭建循环模型与热力学计算;在热力循环设计结果基础上,开展匹配该机组用的超临界二氧化碳离心压缩机设计、三维计算和数值分析,得到超临界二氧化碳离心压缩机在不同转速下的压比-流量性能曲线。研究结果表明:超临界二氧化碳离心压缩机数值计算结果与设计要求较吻合,最小相对误差为0.003%,最大相对误差为4.056%;在叶轮尾缘处吸力面侧有小面积范围内的熵增变化,说明该区域存在流动损失,在叶轮前缘附近出现明显的低温和低压区域,特别是压力面侧,导致相变发生,对该型压缩机的长期稳定运行产生危害,需要进一步优化设计。As a key factor limiting the development bottleneck of supercritical carbon dioxide power generation technology,the research on efficient cycle structures and key equipment is currently an important issue that needs to be addressed.A cycle model and thermodynamic calculation is built based on the design requirements of a 100 kilowatt supercritical carbon dioxide Brayton cycle power generation system.Then,based on the thermodynamic cycle design results,the design,three-dimensional calculation,and numerical analysis of the supercritical carbon dioxide centrifugal compressor used to match the unit are carried out,and the pressure ratio flow performance curves of the supercritical carbon dioxide centrifugal compressor studied at different rotational speeds are obtained.The research results indicate that the numerical calculation results of the supercritical carbon dioxide centrifugal compressor studied are in good agreement with the design requirements.The minimum relative error is 0.003%,and the maximum relative error is 4.056%.There is a small area of entropy increase change on the suction surface side at the trailing edge of the impeller,indicating that there is flow loss in this area.There are obvious low temperature and low pressure areas near the leading edge of the impeller,especially at the pressure surface side,which leads to phase transformation and poses a threat to the long-term stable operation of this type of compressor.Therefore,further optimization design is needed.

关 键 词：简单回热循环 超临界二氧化碳 离心压缩机 

分 类 号：TK14[动力工程及工程热物理—热能工程]