基于再热的两级闪蒸地热发电系统优化  

OPTIMIZATION OF DOUBLE-FLASH GEOTHERMAL GENERATION SYSTEM BASED ON REHEATING

作　　者：李亚 张伟 吴方之[4] 柴永志 Li Ya1, Zhang Wei2,3, Wu Fangzhi4, Chai Yongzhi3(1. School of Renewable Energy, North China Electric Power University, Beijing 102206, China ; 2. Beijing Key Laboratory of Low Grade Energy Multiphase Flow and Heat Transfer, North China Electric Power University, Beijing 102206, China ; 3. School of Energy, Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China ; 4. Tibet Geothermal Power Engineering Research Center, Beijing 100086, China)

机构地区：[1]华北电力大学可再生能源学院,北京102206 [2]低品位能源多相流动与传热北京市重点实验室,华北电力大学,北京102206 [3]华北电力大学能源动力与机械工程学院,北京102206 [4]西藏地热发电工程研究中心,北京100086

出　　处：《太阳能学报》2018年第9期2486-2492,共7页Acta Energiae Solaris Sinica

基　　金：国家自然科学基金(51476057);中央高校基本科研业务费专项资金(2015MS47)

摘　　要：为提高汽轮机的排汽干度，针对肯尼亚奥卡瑞地区某固定冷热源参数的地热资源，提出分别采用高压汽水分离器所分离蒸汽及分离热水作为再热源的两级闪蒸系统，以两级汽轮机的总输出功为目标函数，排汽干度高于0．88为约束条件，对再热蒸汽的抽汽比、二级闪蒸压强和再热器的效能等参数进行优化计算。结果表明，与常规的两级闪蒸扩容系统相比，采用分离蒸汽和高温热水进行再热后，机组的最大输出功可分别提高22．16％和24．18％，为高效地热电站的系统设计提供新思路。In order to improve the quality of the exhausted vapor, the double-flash system with reheating is studied for a certain geothermal resource in Olkaria Kenya. Two different reheating systems which respectively used the primary separated steam and separated brine as the reheating source were investigated. Taking the gross out power as the objective function and the least dryness of the exhaust steam of 0.88 as the constraint condition, the primary steam extraction ratio, the secondary flash pressure and the energy efficiency of the reheater were analyzed by optimization calculation. It was found that the maximum out power was respectively enhanced by 22.16% and 24.18% for the reheating systems using the primary separated steam and separated hot brine as reheating resources.

关 键 词：地热电站 再热循环 能效比 抽汽 

分 类 号：TK529[动力工程及工程热物理—热能工程]