摘要
超临界机组采用再循环泵的起动方式存在投资大、结构复杂、疏水在泵内易产生汽蚀等缺点,对此提出用升压式汽水喷射器代替机械式泵的改进方案。根据汽水喷射器基于直接接触凝结的一维模型对输出压力进行计算,结果表明改进的起动系统除继承机械式泵的优点外,还具有结构简单,投资少,可靠性高的特点。
The start - up system with recirculating pump for supercritical unit has such shortcomings as complex structure, high investment, and cavitation in recirculating pump. Therefore, a pressed steamwater injector is proposed to replace the recirculating pump. Numerical computation of output pressure based on the direct contact condensation model demonstrates that the new start- up system with pressed steam- water injector possesses not only the same functions of the original system, but also the advantages of simple structure, low investment, higher reliability, and cavitation - free. In the pressed steam- water injector, supersonic steam flow drives sub- cooled water and condenses in it, the condensation changes the mixture temperature to form a shock wave for improving water discharge pressure. The new start - up system takes high - speed steam flow formed by drainage vaporization as its source power.
出处
《热力发电》
CAS
北大核心
2009年第4期61-64,共4页
Thermal Power Generation
关键词
超临界机组
起动系统
喷射器
直接接触凝结
汽羽
supercritical unit
start - up system
injector
direct contact condensation
