蒸汽喷射热泵在火电机组回热系统局部改造中的应用  

Application of steam ejector heat pump in partial innovation of heat regenerative system

作　　者：郭江龙[1] 于鑫玮[2] 陈海平[3] 鲁光武[2] 谢秀英[2] 

机构地区：[1]河北省电力公司电力研究院,河北石家庄050021 [2]华北电力大学能源动力与机械工程学院,河北保定071003 [3]华北电力大学国家火力发电工程技术研究中心,北京102206

出　　处：《热力发电》2014年第3期92-95,共4页Thermal Power Generation

摘　　要：以300MW机组为例,研究采用蒸汽喷射热泵将汽动给水泵汽轮机(小汽轮机)的部分排汽回收至机组回热抽汽系统对凝结水进行加热的方法,以有效利用小汽轮机排汽余热。同时,借助等效焓降法对各改造方案的热经济性指标进行了计算和分析比较。结果表明:将蒸汽喷射热泵出口混合蒸汽回收至汽轮机4段抽汽的经济效益最好;机组在额定工况下且蒸汽喷射热泵引射系数为0.75时,发电标准煤耗率可降低1.05g/(kW·h),节能效果显著。A part of exhaust steam from small steam turbine in a 300 MW unit was recycled to the regenerative extraction steam system to heat the condensate water by steam ejector heat pump, so as to use the exhaust steam and its waste heat effectively. The equivalent enthalpy drop method was adopted to analyze the thermal economic index of different transformation schemes. The results showed that the economic benefits reached the highest when the outlet steam of the steam ejector heat pump was recovered to the fourth section of the steam extraction. The standard coal consumption rate for power generation reduced by 1.05g/（kW · h） under rated load condition when the ejector coefficient was 0.75.

关 键 词：300 MW机组 蒸汽喷射热泵 小汽轮机 排汽 回热系统 余热利用 

分 类 号：TK212[动力工程及工程热物理—动力机械及工程]