摘要
为解决目前火力发电厂中低压加热器存在的问题,设计了一种能够用于火电厂的两级引射混合式低压加热器,并用实验方法研究了该加热器的加热性能,分析了工作流体压力、引射流体压力和进水温度对其引射系数、出口温升以及加热效率的影响,并对单级引射和两级引射两种结构形式的加热能力进行了对比.结果表明,在定蒸汽压力的条件下,工作流体压力越高,引射系数越小,出口水温降低,加热效率升高;当进水温度较低时,引射系数较大,加热效率较高;并且两级引射的加热效果明显优于单级引射,平均温升提高20%以上,加热效率高达99%,其加热性能优于传统的间壁式低压加热器,可望在火力发电厂混合式低压加热器中应用.
Two-stage ejecting-mixing heater was designed which could be applied in power plant in order to solve the problem of low-pressure heater at present.Heating performance of ejecting-mixing heater was studied through the experimental method.The influences of working fluid pressure,ejecting fluid pressure and inlet water temperature on ejecting coefficient,the outlet water temperature and heating efficiency were analyzed.Heating performance of single-stage ejector and two-stage ejector was contrasted.The results show that ejecting coefficient and the outlet water temperature decline with working fluid pressure rising while steam pressure keeps constant.But heating efficiency increases with working fluid pressure rising.Ejecting coefficient and heating efficiency is higher while inlet water temperature is lower.Heating effect of two-stage ejector is superior to single-stage ejector,and the outlet water temperature rises more than 20%.Heating efficiency of two-stage ejecting-mixing heater can reach 99%.Heating performance of two-stage ejecting-mixing heater is superior to the traditional low-pressure heater.The new type ejector is expected to be applied in low-pressure heater of power plant.
出处
《应用基础与工程科学学报》
EI
CSCD
2011年第1期126-132,共7页
Journal of Basic Science and Engineering
基金
重庆市科委2009年重点攻关项目(CSTC.2009AB3084)
关键词
引射混合式加热器
低压加热器
引射系数
加热性能
ejecting-mixing heater
low-pressure heater
ejecting coefficient
heating performance
