摘要
建立了全流式地热发电系统模型，基于螺杆膨胀机内效率与膨胀比的关系，分析了膨胀机最佳入口工质干度．以此为基础，分析以90～150℃饱和水为热源的全流式地热发电系统的发电性能并与有机朗肯循环（ORC）系统进行比较．结果表明：螺杆膨胀机入口工质干度存在最佳值，使得系统净功率最大；当热源温度处于90～130℃时，全流式地热发电系统具有较好的性能，而当热源温度处于130～150℃时该系统则无明显优势；全流式地热发电系统适合于带有一定干度蒸汽的热源，可以减少节流造成的炯损失；对于温度处于130～150℃的热源，双级系统中第2级的全流式地热发电系统对第1级的ORC系统的排热具有很好的回收效果．
A model of full-flow geothermal power generation system was set up to analyze the optimal dryness of its inlet working medium according to the relationship between screw expander efficiency and expansion ratio, based on which a study was made on the generating performance of the full-flow geothermal power generation system with saturated water of 90-150℃ as the heat source, in comparison with ORC system. Results show that there exists an optimal inlet dryness of screw expander when the system net power reaches the maximum; when the temperature of heat source lies in 90-130 ℃, the system shows a relatively good performance, whereas when the temperature lies in 130-150 ℃, the system shows no significant advantages. It is suitable for the system to take the steam with a certain degree of dryness as its heat source, due to reduced exergy loss of throttling. For the heat source at 130-150℃, the second-stage full-flow geothermal power generation system exhibits an excellent effect on recycling the waste heat from the first-stage ORC system in a dual-stage system.
出处
《动力工程学报》
CAS
CSCD
北大核心
2016年第12期1010-1016,共7页
Journal of Chinese Society of Power Engineering
关键词
全流式地热发电系统
入口工质干度
性能分析
双级系统
full-flow geothermal power generation system
optimal dryness of inlet working medium
performance analysis
dual-stage system
