单级和两级地热发电系统能量转换分析  

Single and Double Energy Conversion of Geothermal Power Generation

作　　者：骆超[1] 马伟斌[1] 

机构地区：[1]中国科学院广州能源研究所,中国科学院可再生能源重点实验室,广州510640

出　　处：《科技导报》2014年第14期35-41,共7页Science & Technology Review

基　　金：国家高技术研究发展计划(863计划)项目(2012AA053003)

摘　　要：地热资源是一种重要的可再生能源,但是中国地质和地热资源复杂。为了更好地利用这种能源,基于热力学基本原理,采用数值计算和模拟,对包括单级闪蒸、双工质循环、两级闪蒸和闪蒸-双工质联合地热发电的单级和两级地热发电系统的主要性能指标进行了对比和分析。结果表明,采用直接冷却方式的单级和两级地热发电系统的各项性能指标均优于间接冷却;两级发电系统的净发电量高于单级闪蒸的净发电量,地热水温度较高时,尽量采用两级发电系统;闪蒸-双工质地热发电系统的最佳闪蒸温度较高,产汽率较低,既有利于减少设备体积,也可以使发电系统处于正压运行,可以提高系统的运行效率。Geothermal power is an important renewable energy source. China possesses complex geological conditions and geothermal resources. For better utilization of this energy, the performance of single and double geothermal power systems including single and two-stage flash system, binary power system and flash-binary power system is analyzed and compared on the basis of numerical calculation. The results show that the performance of direct cooling system is better than that of indirect cooling system; the power output of double energy conversion system is higher than that of single system. Double energy conversion system is a better choice when the geothermal temperature is high. The optimum flash temperature of the flash-binary system is higher than that of other systems, which is helpful to reducing equipment volume and keeping appropriate system pressure. The results of this study provide theoretical basis and simulation verification for applications of geothermal energy.

关 键 词：闪蒸发电 双工质循环 发电量 热效率 产汽率 

分 类 号：TM616[电气工程—电力系统及自动化]