低温地热发电有机朗肯循环与跨临界循环的优化研究-工程热物理专业论文.docxVIP

ABSTRACT The research on low-temperature geothermal power generation technology. will promote exploitation and usage of the huge quantity energy of Iow temperature geothermaI resources，reduce fossiI fueI consumption and gree由ouse gas emissions and other air poIlutants，In addition it will bring huge social and economic benefits. Limited by the level of gωthermal source temperature ，the efficiency of power system is very low. Select better cycle，working fluid and operating conditions will be helpful in improve the economy of system. This thesis based on low tempera阳re geothermal resourcescalculate the performance of 19 kinds of organic refrigerants when they were used in trans心riticaI cycle or sub-critical ORC pow町 generation system under the multi-objective function， by comparison and analysis we selected some working fluids with better performance. Combined the design of heat exchanger，optimaI calculation was done to find out the most economical working fluid system under the objective function of APR and system net output pow盯. Change the evaporating temperature ，condensing temperature ，pressure，turbine inlet temperature and other parameters respectively to see the influence on system economy. The results showed that Rl52a and R41 has good performance ，trans-critical cycle using R41 has maximum ou叩ut power and sub-critical cycle using R152a has little APR while lager output power. 、We des盼1ed low-temperature power generation systems with R152a and R41 as working fluids respectively，then makes a study on investment appraisaI of the 、 systems equipmentthe results shows that the system with R152 has higher rate of return on investment than another. While the trans-critical syst创n wi由R41 has higher 噜 飞， net income than sub-criticaI system. KEY WORDS: Low-temperature geothermal powe民 Trans-critical cycle. Sub-critical ORC，Refrigerant System performance 目录 第一章绪论 4 ………. . … 1 1.1 课题研究背景 .…... ………… 1 1.2 低温地热发电技术的研究及