金属表面涂装行业VOCs排放特征及排放系数

对比了浙江省2014和2018年金属表面涂装企业的有机废气排放及治理情况，分析了该行业涂料及稀释剂的使用、主要污染因子，测算了溶剂型、水性涂料的挥发性有机物（VOCs）产生系数和排放系数.结果表明：2018年VOCs治理水平明显高于2014年，水性涂料使用企业比例由18%上升至36%，纯溶剂型企业由82%下降至64%；金属表面涂装行业的主要排放污染物为二甲苯、丁醇、乙酸乙酯、乙酸丁酯、甲苯、丙二醇、乙苯、苯乙烯等8种有机物.溶剂型和水性涂料的VOCs产生系数分别为0.72和0.31kg/kg；溶剂型和水性涂料2014年VOCs排放系数为0.64和0.29kg/kg，2018年为0.48和0.21kg/kg.

The VOCs emission characteristics ofmetal surface coating industryand its emission factors

This paper focused on the variation ofthe organic waste gasemissions and the circumstance of pollution control from metal surface coating industry in Zhejiang Province in the year of 2014 and 2018. The kind of coating and thinners,and criteria pollutants used in the industrialwereanalyzed. The coefficient of generating and emission of volatile organic compounds (VOCs) from solvent-based coatings and water-based coatingswerecalculated. The results showed that the control of VOCs in 2018 was significantly more effective than that in 2014, the proportion of companyusing water-based coatings increased from 18% to 36%, and then the proportion of company using solvent-based coatings decreased from 82% to 64%. The pollutants of metal surface coating industry wererevealed to be xylene, butanol, ethyl acetate, butyl acetate, toluene, propylene glycol, ethylbenzene and styrene. At last, the VOCs generating coefficients of solvent-based coatings and water-based coatings were 0.72 and 0.31kg/kg, respectively. The VOCs emission coefficients of solvent-based coatings and water-based coatings in 2014 were 0.64 and 0.29kg/kg, respectively, and the values of which in 2018 were 0.48 and 0.21kg/kg, respectively.