低压加热器疏水方式改进的经济性分析  

Economic Analysis on Renovation Dewatering Method of Low Pressure Heater

作　　者：顾江其 王培红[1] Gu Jiangqi;Wang Peihong(Southeast University Energy and Environment College Energy Thermal Transfer and Process Supervision Important Lab of Education Ministry)

机构地区：[1]能源热转换及其过程测控教育部重点实验室东南大学能源与环境学院

出　　处：《上海节能》2018年第3期197-201,共5页Shanghai Energy Saving

摘　　要：火电机组的低压加热器单元疏水方式对机组经济性有着重要的影响。现有的疏水方式有疏水逐级自流、疏水泵以及疏水冷却器等,根据目前的运行经验,疏水逐级自流时疏水热量的回收率较低,通过加装疏水泵或者疏水冷却器来改变疏水方式,可以提高疏水热量的回收率。针对疏水冷却器和疏水泵两种改进措施,本文借助等效焓降法,确定了用以进行改进的最佳加热器的位置。通过对疏水泵、疏水冷却器以及同时使用疏水泵和疏水冷却器三种改进方案的比较与计算,表明在#6加热器采用疏水泵比其他方式更为经济。Dewatering method of low pressure heater unit for coal-fired unit has huge impact on unit economy.Current dewatering methods have gradient flow of dewatering,dewatering pump and dewatering cooler.According to operation experience,gradient flow of dewatering‘s thermal recycling rate is low.Through installing dewatering pump or dewatering cooler,it could improve thermal recycling rate of dew atering.Focused on dewatering cooler and dewatering pum p,the author confirmed the best heater position with equivalent enthalpy reduction m ethod.Through comparing calculation of three renovation solutions of dew atering pum p,dewatering cooler and both,the article introduces the best way to install dew atering pump at 6#h ea ter,which achieves more economic benefit.

关 键 词：低压加热器 疏水泵 疏水冷却器 等效焓降法 

分 类 号：TM621[电气工程—电力系统及自动化]