摘要
简要说明低压省煤器的节能原理及系统布置,介绍某220 MW机组增设低压省煤器的改造方案。根据相关要求,设计计算了5种工况,应用常规方法计算了改造前后机组的抽汽份额,并对热经济性指标进行了对比。结果表明:排烟温度分别降低20℃,25℃,30℃时,机组发电标煤耗率可降低约1.86g/kW.h,2.4 g/kW.h,2.85 g/kW.h。在低压省煤器进出口烟温降低相同幅度时,低压省煤器中凝结水相对高温升、小流量的工况可以获得更好的效益。
In this paper, briefly introduces the low pressure economizer energy saving principle and system arrangement, together with the modification scheme of installation low pressure economizer in a 220 MW unit. According to the relevant requirements, design and calculation is conducted for five conditions; conventional methods is applied to calculate the steam extraction coefficient of the unit before and after the transformation, and the ther- mal efficiency indices are compared. The results show that when the exhaust gas temperature respectively drop 20 ℃ , 25 ℃, 30℃, standard coal consumption rate could reduce about 1.86 g/kW· h , 2. 4 g/kW · h and 2. 85g/ kW · h. As low pressure gas temperature import and export the economizer drop the same, relatively higher temperature rises, smaller flow for the condensate in low pressure economizer can get better benefits.
出处
《电力科学与工程》
2012年第10期53-56,共4页
Electric Power Science and Engineering
关键词
低压省煤器
热力系统
经济性分析
常规方法
节能降耗
low pressure economizer
thermal system
economic analysis
conventional methods
energy saving
