基于实测的燃煤电厂氯排放特征

发布时间：2018-09-15 06:23

【摘要】：选取我国4家电厂的6台煤粉锅炉进行现场测试,采集并分析烟气以及飞灰、底渣、脱硫石膏等燃煤副产物样品,以开展燃煤电厂Cl污染物排放特征的研究.结果表明:燃煤中96.99%以上的Cl析出进入烟气,原烟气中ρ(Cl)范围为10.17~33.63mg/m3.除尘器和石灰石-石膏湿法脱硫装置对烟气中的Cl具有协同脱除作用,尤其是石灰石-石膏湿法脱硫装置.除尘器对烟气中Cl脱除效率为12.29%~19.86%,石灰石-石膏湿法脱硫装置对烟气中Cl的平均脱除效率为95.22%.经过燃烧和烟气污染控制装置后,燃煤中0.35%~3.01%的Cl转移到底渣中,6.46%~15.00%的Cl转移到飞灰中,68.88%~77.31%通过脱硫废水排放,9.19%~15.95%的Cl转移到脱硫石膏中;只有2.21%~5.54%的Cl排入大气中,净烟气ρ(Cl)仅为0.34~1.38 mg/m3.目前我国燃煤电厂Cl污染的主要问题是妥善处理脱硫石膏和废水,以防止Cl的二次污染.
[Abstract]:Six pulverized coal boilers from 4 power plants in China were selected for field test, and flue gas, fly ash, bottom slag, desulphurized gypsum and other by-product samples were collected and analyzed in order to study the emission characteristics of Cl pollutants in coal-fired power plants. The results showed that more than 96.99% of Cl precipitated into the flue gas, and the range of 蟻 (Cl) in the original flue gas was 10.17 ~ 33.63 mg / m ~ (3). Dust catcher and limestone gypsum wet desulphurization unit have synergistic removal of Cl from flue gas, especially limestone gypsum wet desulfurization device. The removal efficiency of Cl in flue gas by dust collector is 12.29 and 19.86, and the average removal efficiency of Cl in flue gas by limestone gypsum wet desulfurization device is 95.2222. After combustion and flue gas pollution control, 0.35% of Cl in coal was transferred to fly ash by 6.46% and 15.00% of Cl was transferred to fly ash. 77.31% was transferred to gypsum by discharging 15.95% Cl from desulfurization wastewater, only 2.215.54% of Cl was discharged into the atmosphere, and 蟻 (Cl) of net flue gas was only 0.34 ~ 1.38 mg/m3.. At present, the main problem of Cl pollution in coal-fired power plants in China is the proper treatment of desulphurized gypsum and wastewater in order to prevent the secondary pollution of Cl.
【作者单位】：环境基准与风险评估国家重点实验室;中国环境科学研究院;国电科学技术研究院;
【基金】：国家环境保护公益性行业科研专项(200909025,201009048)
【分类号】：X773

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