太阳能辅助燃煤热发电系统优化设计  

Optimal design of a solar aided coal-fired thermal power generation system

作　　者：陈海平 于鑫玮[2] 鲁光武[2] 

机构地区：[1]华北电力大学能源动力与机械工程学院国家火力发电工程技术研究中心,北京102206 [2]华北电力大学能源动力与机械工程学院,河北保定071003

出　　处：《热力发电》2013年第8期13-16,33,共5页Thermal Power Generation

摘　　要：为了克服两相流带来传热效果恶化以及避免流体分层现象,将疏水扩容器引入太阳能集热系统(DSG)代替汽水分离器。将DSG与300MW燃煤机组进行集成,给出了使DSG预热段及过热段仅为工质水及汽单相流的集热系统预热段、过热段的长度计算模型,以及蒸汽流量控制模型,以保证DSG出口蒸汽参数对应于所代替的燃煤机组汽轮机抽汽参数。同时,给出了DSG出口蒸汽代替300MW燃煤机组汽轮机前5段抽汽的5种设计方案,对各方案的热经济性进行了计算分析,认为新设计的DSG出口蒸汽取代燃煤机组汽轮机第3段抽汽的热电转换率最高(0.324),集成方案最优。In order to overcome the deterioration of heat transfer caused by two-phase flow and avoid the flow separation,the steam-water separator was replaced by introducing the drain water flashtank into solar energy collection system.Integration between direct steam generation(DSG) system and a 300MW coal-fired power plant was conducted.To ensure the steam parameters at outlet of the DSG system are equivalent with that at extraction point of turbine a length calculation model of the preheat section and superheat section in the DSG heat collection system in which the working fluid is only water and steam(gas phase)was put forward,and a steam amount control model was also presented.Furthermore,five design schemes for using steam at outlet of the DSG system to replace the first five stage extraction steam in turbine of the 300 MW coal-fired power unit were proposed,and the thermal economy of each scheme was calculated.The results showed that,the scheme that using steam at outlet of the heat collection system to replace the third stage extraction steam of turbine had the highest thermoelectric conversion rate(0.324).

关 键 词：300 MW燃煤机组 太阳能集热系统 预热段 过热段 流量控制 疏水扩容器 热电转换率 

分 类 号：TK515[动力工程及工程热物理—热能工程]