摘要
Abstract
Due to the fine particle size of fly ash and the rapid ash deposition rate in circulating fluidized bed(CFB)boilers,the frequent operation of steam soot blowers increases the risk of erosion on the heating sur-face.This paper investigates the soot blower configurations and operational issues of various CFB units,and comparatively analyzes the selection dilemmas of configuring acoustic soot blowers and shockwave soot blowers for large-scale CFB boilers.Taking a 300 MW CFB boiler as an example,this paper proposes using high-pow-er rotary siren variable-frequency acoustic soot blowers with a sound pressure level of 155 dB to replace steam soot blowers.Considering that the internal hangers and headers of the flue can scatter and block acoustic waves,the acoustic soot blowers are arranged proximally on the left and right side walls of the economizer.Eight units are installed for each group of heating surfaces,with four on the left side wall and four on the right side wall.Within one month after the technical modification,comparative tests between the acoustic soot blow-ers and steam soot blowers are conducted on the unit under 140 MW and 300 MW load conditions,respective-ly.The test results show that,given the same ash deposition rate,the change in the economizer's heat absorp-tion after soot blowing by acoustic soot blowers is more significant,indicating a cleaner soot removal effect;the higher the load,the better the corrective effect of the acoustic soot blower operating independently on the heat absorption loss of the economizer.Eight months after the modification,a shutdown inspection of the heating surface ash deposition reveals that the cleanliness of the H-finned economizer heating surface is good.The re-sults of this technical modification can provide a reference for similar units.关键词
循环流化床锅炉/300 MW等级/积灰特性/声波吹灰器/蒸汽吹灰器/变频Key words
circulating fluidized bed/300 MW class/fouling characteristics/acoustic soot blower/steam soot blower/variable-frequency分类
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