飞灰残碳量对除尘器性能影响规律  

Effect of residual carbon on precipitator performance

作　　者：夏少波 段璐 王建朋 纪任山 崔豫泓 张朝 XIA Shaobo;DUAN Lu;WANG Jianpeng;JI Renshan;CUI Yuhong;ZHANG Chao(China Coal Research Institute,Beijing100013,China;Beijing Tiandi Rongchuang Technology Co.,Ltd.,Beijing100013,China;National Energy Technology&Equipment Laboratory of Coal Utilization and Emission Control,Beijing100013,China)

机构地区：[1]煤炭科学研究总院,北京100013 [2]北京天地融创科技股份有限公司,北京100013 [3]国家能源煤炭高效利用与节能减排技术装备重点实验室,北京100013

出　　处：《煤炭学报》2022年第9期3463-3471,共9页Journal of China Coal Society

基　　金：国家自然科学基金青年基金资助项目(51906095);中国煤炭科工集团有限公司国际合作资助项目(2019-TD-2-CXY003)。

摘　　要：燃煤工业锅炉应用单一布袋除尘器已难以满足愈发严格的排放标准,电袋除尘器是实现燃煤工业锅炉超低排放的选择之一。基于耦合电袋除尘器实验平台,研究了残碳量对飞灰特性及布袋除尘器和电袋除尘器除尘性能、运行情况及能耗等的影响,结果表明,堆积密度随飞灰残碳量降低而增大,残碳量高于18.18%时增速较慢,低于18.18%时增速较快。与布袋除尘器相比,电袋除尘器出口总尘质量浓度和不同粒径颗粒物质量浓度均降低,总尘脱除效率和分级脱除效率均提高,喷吹周期延长,喷吹压降最低值普遍降低,总能耗均降低,并且残碳量越低,除尘性能越好。布袋除尘器对不同残碳量飞灰有不同穿透窗口,脱除效率随飞灰残碳量降低而提高,而电袋除尘器对残碳量低于18.18%的飞灰无明显穿透窗口。两除尘器喷吹周期均随着喷吹次数增加而减小,压降最低值随着喷吹次数增加而升高。电袋除尘器对4种飞灰的平均喷吹周期分别是布袋除尘器的3.27倍、4.27倍、4.91倍和1.92倍,并且随着飞灰残碳量的降低,布袋除尘器的喷吹周期延长,压降最低值减小,总能耗先减后增,电袋除尘器的喷吹周期则先延长后缩短,压降最低值先减后增,总能耗先增后减,布袋压降是布袋除尘器和电袋除尘器总能耗的主要因素。总体而言,电袋除尘器在除尘性能、长周期运行和能耗等方面均优于布袋除尘器,是燃煤工业锅炉实现超低排放的有效途径之一。Hybrid electrostatic precipitator is one of prospective devices for ultra-low emissions in coal-fired industrial boilers because a single bag filter has been difficult to meet stricter emission standards.An experiment has been carried out based on the coupling electric bag filter experimental system to investigate the effect of carbon residue on particle characteristics,dust removal performance,operating conditions and energy consumption of the bag filters and hybrid electrostatic precipitators.The results show that the bulk density increases slowly and then increases sharply as the carbon residue increases more than 18.18%.Compared to the bag filter,the total and grade dust mass concentrations at the outlet of hybrid electrostatic precipitators are lower,the total and grade dust removal efficiencies are higher,the blowing cycles are extended,the minimum pressure drop is reduced,and the total energy consumption is decreased.Moreover,dust removal performance is better with lower carbon residue of fly ash.The penetration windows of the bag filter distribute at different particle sizes with different carbon residues.Also the hybrid electrostatics has no obvious penetration window expected for the fly ash with residual carbon less than 18.18%.The blowing cycles of both dust collectors decrease and the minimum pressure drop of both dust collectors increases as the number of blows increases.An average blowing cycle of the hybrid electrostatic precipitators for four kinds of fly ash is 3.27,4.27,4.91 and 1.92 times of the fiber filter,respectively.With carbon residue decreasing,the blowing cycle of the fiber filter extends and the minimum pressure drop decreases,the blowing cycle of hybrid electrostatic precipitators first extends and then shortens and the minimum pressure drop decreases firstly and then increases.In addition,with the residual carbon reduction,the total energy consumption first decreases and then increases for the bag filter and first decreases and then increases for the hybrid electrostatic precipitato

关 键 词：布袋除尘器 电袋除尘器 残碳 除尘性能 压降 能耗 

分 类 号：TQ536[化学工程—煤化学工程]