两级闪蒸和闪蒸-双工质地热发电热力学比较  

Thermodynamic comparison between two stage flash and flash-binary geothermal power system

作　　者：骆超[1] 马春红[2] 刘学峰[2] 郭新锋[2] 王延欣[2] 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 [2]中国石化集团新星石油有限责任公司,北京100083

出　　处：《科学通报》2014年第11期1040-1045,共6页Chinese Science Bulletin

基　　金：国家高技术研究发展计划(2012AA053003);中石化科技部中低温地热发电技术前瞻性研究项目资助

摘　　要：我国中低温地热资源主要分布在东南沿海地区,主要用于洗浴等,使得大量热能白白浪费.为提高我国中低温地热资源的能量转换利用率,本文提出了两级地热闪蒸和地热闪蒸-双工质联合发电方式,以单位热水发电量、热效率和产汽率为性能指标,通过数值计算,分析地热水温度对两种不同地热发电系统的性能指标影响以及地热尾水温度的影响,并对两种发电系统的选用条件作了论述.结果表明,闪蒸-双工质联合发电系统的单位热水的发电量随温度升高的增加量大于两级闪蒸的增加量.当热水温度在80~130℃时,两级地热闪蒸发电系统的单位热水净发电量比闪蒸-双工质联合系统的单位热水净发电量多达19.4%;当热水温度在130~150℃时,闪蒸-双工质联合系统的单位热水净发电量比两级地热闪蒸发电系统的单位热水净发电量多达5.5%.两级地热闪蒸发电系统闪蒸产汽量总和约为闪蒸-双工质发电系统闪蒸产汽量的2~3倍.当热水温度低于130℃并且热水量较大时,可以采用闪蒸-双工质联合发电系统,当热水温度高于130℃,并且地热水中的不凝气体含量低于3%时,可以考虑两级闪蒸发电系统;和两级闪蒸发电系统尾水相比,较高温度的闪蒸-双工质发电系统尾水资源梯级利用效率更高.To increase the energy conversion efficiency of geothermal resource, the authors propose the two-stage geothermal power system. The thermodynamic performance and applicable conditions of double flash and flash-binary power systems were compared and discussed based on numerical simulation. The double flash system showed a 19.4% higher net power output than flash-binary system when the geothermal resource temperature was between 80℃ and 100℃. The flash-binary geothermal system showed a maximum of 5.5% net power output than the double flash system when the geothermal resource temperature was between 130℃ and 150℃. The total steam production of thedouble power system was 2-3 times of the flash stage of the flash-binary power system. Compared with the two stage flash geothermal power system, the temperature of the geothermal tail water of flash-binary system was higher, which indicated a higher efficiency on cascade utilization of the geothermal resources.

关 键 词：地热发电 两级闪蒸 双工质循环 闪蒸-双工质 联合发电 热效率 

分 类 号：TK21[动力工程及工程热物理—动力机械及工程]