摘要
煤炭燃烧会产生大量飞灰颗粒物,其造成的空气污染给人类健康及生存环境带来了巨大影响。针对江西某电厂2???340MW燃煤机组,进行了细颗粒物化学团聚工业应用工程试验。通过安装自行设计制造的化学团聚系统,综合考察了化学团聚技术对燃煤电厂静电除尘器(electrostaticprecipitators,ESP)效率的影响,对电厂运行参数的影响,及团聚后排放至大气的颗粒物特性。试验结果表明,喷入化学团聚剂后,细颗粒物排放浓度显著降低。4号机组连续喷入240min团聚剂后,ESP后颗粒物浓度下降约61.7%,脱硫后颗粒物浓度下降了约77.9%;3号机组连续喷入化学团聚剂168h后,ESP后颗粒物平均浓度为22.6mg/m3。脱硫后颗粒物平均浓度为5.7mg/m3。采集脱硫后排入大气的烟尘颗粒物,粒径峰值为0.8?m,绝大多数飞灰颗粒粒径在0.1～1?m内。连续喷入化学团聚剂后,ESP后SO2浓度由2866mg/m3降至2354mg/m3,下降了约17.9%;NOx浓度和O2浓度无明显变化;烟气湿度提高了约0.4%。
Fly ash particles caused by coal combustion had given rise to the air pollution, which had great impact on human health and living environment. The industrial application trials of fine particle chemical agglomeration in a power plant with 2 ′ 340 MW coal-fired boilers in Jiangxi province was studied in this paper. Self-designed and manufactured chemical agglomeration system was equipped and the effect of chemical agglomeration technique on removal efficiency of electrostatic precipitators(ESP) and operational parameters of coal-fired power plant were studied, as well as the emission characteristics of fly ash particles. The experimental results showed that fine particle emission concentration significantly decreased after chemical agglomeration solutions were sprayed. In No.4 boiler, after continuous-spraying the chemical agglomeration solutions for about 240 minutes, the average particle concentration after ESP decreased by 61.7%. The particle concentration after wet desulphurization(WFGD) also decreased by about 77.9%. In No.3 boiler, after continuous-spraying the chemical agglomeration solutions for about 168 hours, the average particle concentration after ESP decreased to 22.6 mg/m3 and the particle concentration after WFGD decreased to as low as 5.7 mg/m3. The peak diameter of the fly ash particles which were collected after WFGD was 0.8mm. The majority particle size of fly ash range in 0.1~1mm. After continuous-spraying the chemical agglomeration solutions, the average SO2 concentration after ESP decreased from 2866 mg/m3 to 2354 mg/m3, which was decreased by 17.9%. While the average NOx concentration and the O2 concentration showed no obvious change. Besides, the humidity of flue gas increased by 0.4%.
作者
郭沂权
赵永椿
李高磊
张军营
GUO Yiquan;ZHAO Yongchun;LI Gaolei;ZHANG Junying(State Key Lab of Coal Combustion,School of Energy and Power Engineering(Huazhong University of Science and Technology),Wuhan 430074,Hubei Province,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2019年第3期754-763,954,共11页
Proceedings of the CSEE
基金
国家重点研发计划项目(2016YFB0600604)
国家自然科学基金项目(41672148)~~
关键词
细颗粒物
化学团聚
超低排放
燃煤电厂
排放特性
fine particulate
chemical agglomeration
ultra-low emission
coal-fired power plant
emission characteristics
