超超临界机组变转速“汽电双驱”引风机技术研究  

Research on Variable Speed“Steam and Electric Dual Driven”Induced Draft Fan Technology for Ultra-Supercritical Units

作　　者：姚君[1] 周华 顾欣 张涵 顾徐鹏[1] YAO Jun;ZHOU Hua;GU Xin;ZHANG Han;GU Xupeng(East China Electric Power Design Institute Co.,Ltd of China Power Engineering Consulting Group,Shanghai 200063,China)

机构地区：[1]中国电力顾问集团华东电力设计院有限公司,上海200063

出　　处：《电力勘测设计》2024年第11期93-98,共6页Electric Power Survey & Design

摘　　要：考虑到电动引风机能耗高、常规减温减压供热节流损失大,目前已有许多机组采用了汽动引风机排汽供热技术、定转速“汽电双驱”引风机排汽供热技术。通过设置背压式汽轮机,拖动引风机做功,其排汽对外供热,可有效降低机组厂用电率,并且减少供热减温减压损失,提升机组效率。常规的汽动引风机排汽供热技术,在实际运行中,存在小汽轮机效率偏低(特别是低负荷)、排汽量与供热量匹配度较差等问题;现有的定转速“汽电双驱”引风机技术,已有效解决了上述两点问题。在此基础上,本文探索研究了变转速“汽电双驱”引风机技术,旨在进一步优化引风机轴系配置方案,提高轴系效率。Considering the high energy consumption of electric-driven induced draft fan and the high throttling loss of conventional desuperheating and decompressing heat supply,the steam-driven induced draft fan technology and constant speed‘steam and electric dual driven’induced draft fan technology have been adopted by many generation units.A back-pressure steam turbine is used to drag the induced draft fan and its exhaust steam is used for external heat supply.This can reduce the service power consumption rate of the unit,and reduce the throttling loss of desuperheating and decompressing heat supply,and improve the unit thermal efficiency.However,in the actual operation,there is a problem that the steam turbine efficiency is relatively low(especially low load)and the exhaust steam amount can’t match the demand of heat supply well.The constant speed‘steam and electric dual driven’induced draft fan technology proposed.At present,the system runs well.And the technology effectively solves the above two problems.On this basis,this paper studies the variable speed‘steam and electric dual driven’i nduced draft fan technology,aiming at further optimizing the configuration scheme of induced draft fan shaft system and improving the efficiency of shaft system.

关 键 词：变转速 汽电双驱 供热 厂用电率 

分 类 号：TM621[电气工程—电力系统及自动化]