内置阵列式声波吹灰器应用及节能分析  

Application and Energy-saving Analysis of Built-in Array Acoustic Sootblower

作　　者：周磊 张举 宋梓源 杨志平[3] 郭培虎 肖海平[3] 张晨 李建龙 ZHOU Lei;ZHANG Ju;SONG Ziyuan;YANG Zhiping;GUO Peihu;XIAO Haiping;ZHANG Chen;LI Jianlong(Huaneng Ningxia Daba Power Plant Phase IV Power Generation Co.,Ltd.,Qingtongxia 751600,Ningxia Hui Autonomous Region,China;Huadian Hexiang Engineering Consulting Co.,Ltd.,Taiyuan 030006,Shanxi Province,China;School of Energy Power and Mechanical Engineering,North China Electric Power University,Changping District,Beijing 102206,China;Beijing Zhongdian Huineng International Power Technology Co.,Ltd.,Haidian District,Beijing 100081,China)

机构地区：[1]华能宁夏大坝电厂四期发电有限公司,宁夏回族自治区青铜峡市751600 [2]华电和祥工程咨询有限公司,山西省太原市030006 [3]华北电力大学能源动力与机械工程学院,北京市昌平区102206 [4]北京中电慧能国际电力科技有限公司,北京市海淀区100081

出　　处：《发电技术》2020年第6期706-714,共9页Power Generation Technology

基　　金：国家科技支撑计划项目(2015BAA04B02);华能集团总部科技项目(HNKJ18-H21)。

摘　　要：由于传统蒸汽吹灰技术存在吹灰死角,需耗费大量高品质蒸汽,且蒸汽因对受热面进行冲刷而影响其安全性,因此近年来较多的新建电厂倾向于在低温烟道采用内置阵列式声波吹灰器对低温再热器、低温过热器、省煤器进行吹扫。结合某660 MW电厂声波吹灰器的应用进行经济性评价研究。吹灰经济性通过锅炉侧的锅炉效率和汽机侧的汽轮机热效率2个指标来评价,采用锅炉反平衡方法计算某个负荷下锅炉排烟温度变化1℃时锅炉效率的变化量,吹灰后通过排烟温度的降低值来计算锅炉效率的增大值,进一步计算出煤耗的降低值。采用等效焓降法中工质携带热量出系统的计算方法,得到吹灰蒸汽量对汽轮机热耗的影响,并进一步计算出煤耗的增大值。综合考虑锅炉侧和汽机侧的经济性评价,得出声波吹灰器运行时的经济性增益。结果表明,采用内置阵列式声波吹灰器较常规蒸汽吹灰器年节约成本100万元以上。对于多年运行经济性较差的机组,采用内置阵列式声波吹灰器会有更佳的节能效果。Because the traditional steam sootblowing technology has a dead corner,it needs a lot of high quality steam,and the safety of the steam is affected by the scouring of the heating surface.Therefore,in recent years,many new power plants tend to adopt built-in array acoustic sootblower in the low-temperature flue to purge the low-temperature reheater,low-temperature superheater and economizer.Combined with the application of acoustic sootblower in a 660 MW power plant,the economic evaluation was studied.The sootblowing economy was evaluated by two indexes:boiler efficiency at boiler side and steam turbine thermal efficiency at turbine side.The boiler anti-balance method was used to calculate the boiler efficiency variation when the exhaust gas temperature changed 1℃under a certain load.The increase of boiler efficiency was calculated by the decrease of flue gas temperature after sootblowing,and the decrease of coal consumption was further calculated.By using the calculation method of heat carrying out system by working medium in the equivalent enthalpy drop method,the influence of sootblowing steam on the heat consumption of steam turbine was obtained,and the increase of coal consumption was further calculated.The economic gain of acoustic sootblower was obtained by considering the economic evaluation of boiler side and steam turbine side.The results show that compared with the conventional steam sootblower,the annual cost saving of the built-in array acoustic sootblower is more than 1 million yuan.In addition,it will have better energy-saving effect for units with poor economic performance for many years.

关 键 词：燃煤发电机组 内置阵列式声波吹灰器 节能分析 经济性评价 

分 类 号：TK229.6[动力工程及工程热物理—动力机械及工程]