The Coupled Effects of Dryness and Non-condensable Gas Content of Geothermal Fluid on the Power Generation Potential of an Enhanced Geothermal System  

作　　者：LI Tailu LI Xuelong JIA Yanan GAO Xiang 

机构地区：[1]School of Energy and Environmental Engineering,Hebei University of Technology,Tianjin 300401,China [2]Tian Architectural Design Company Limited,Tianjin 300384,China

出　　处：《Acta Geologica Sinica(English Edition)》2021年第6期1948-1957,共10页地质学报（英文版）

基　　金：support provided by the National Key Research and Development Program of China(Grant No.2018YFB1501805);the National Natural Science Foundation of China(Grant No.52176183)。

摘　　要：The Enhanced Geothermal System(EGS) is a recognized geothermal exploitation system for hot dry rock(HDR), which is a rich resource in China. In this study, a numerical simulation method is used to study the effects of geothermal fluid dryness and non-condensable gas content on the specific enthalpy of geothermal fluid. Combined with the organic Rankine cycle(ORC), a numerical model is established to ascertain the difference in power generation caused by geothermal fluid dryness and non-condensable gas content. The results show that the specific enthalpy of geothermal fluid increases with the increase of geothermal fluid temperature and geothermal fluid dryness. If the dryness of geothermal fluid is ignored, the estimation error will be large for geothermal fluid enthalpy. Ignoring non condensable gas will increase the estimation of geothermal fluid enthalpy, so the existence of the non-condensable gas tends to reduce the installed capacity of a geothermal power plant. Additionally, both mass flow of the working medium and net power output of the ORC power generation system are increased with increasing dryness of geothermal fluid, however there is some impact of geothermal fluid dryness on thermal efficiency.

关 键 词：hot dry rock geothermal fluid DRYNESS non-condensable gas organic Rankine cycle 

分 类 号：TM616[电气工程—电力系统及自动化] P314[天文地球—固体地球物理学]