Characteristics of VOCs Emission from Paint Industry

• Main Authors: Wen-Cheng Chen, 陳文政
• Other Authors: Tung-Shu-Chu
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/26442339056674464954

碩士 === 崑山科技大學 === 環境工程研究所 === 100 === The purposes of this study was to understand the characteristics of VOCs emission from paint industry (including the emission approaches, emission sources and feasible reduce methods of VOCs. Besides, the reduction efficiencies of VOCs from delivery and storage of raw materials and the process by the economic and technical feasibility methods were evaluated. In this study, possible VOCs reduction methods or techniques were valuated from raw materials, processes, operation management and control at the end of three painters selected. Case one removs the VOCs from oil-based solvents collected in pipeline with bio-trickling reactor. The annual emission was about 79 tons based on disclosure information of VOCs air pollution control fee with emission coefficients. In addition to VOCs of pipeline, the factory''s release source was clearly more serious problems from storage tank of solvent, package of coating, dumping of solvent, grinding device and collection of waste solvents, etc. To reduce emissions of VOCs, the collection efficiency of VOCs must increased to 80% by work area equipped with booth-style hood and curtain to avoid the dissipation of VOCs. The reduction incentive does not exist on economic benefits. Case two, except procedure of filling, all units were in confined spaces during production process. All work areas were equipped suction gas gathering system, then, the gathering gas was transferred to the tower of activated carbon. The emission of VOCs for whole plant was 39604.2 kg / yr before treatment. The emission of VOCs was 38884.2 kg/yr after adsorption of activated carbon, which was replaced quarterly with the capacity of 300 ~ 400 kg. In 2007, the annual VOCs emission was only 2068.8 kg/yr estimated with the measured data. For case two, compare to the 38884.2 kg / yr estimated with emission coefficient, the factory coefficients are more favorable. Besides, the low amount exhaust (200 Nm3/min) from end of the pipe and moderate VOC concentrations, bio-filter bed should be a good treatment system with operating conditions of flexibility, low initial cost to reduce the air pollution fee of 373,284 dollars. Case three, in 2007, the emission of VOCs was 135.798 tons and air pollution fee of 1,581,576 dollars under calculation with EPA emission coefficients, but the emission of VOCs was only 96 tons under estimate with mass balance. Hence the factory coefficients are more favorable. Five adsorption slots of activated carbon just removed 0.073% of annual emissions of VOCs. Regenerative thermal oxidizer (RTO) and two new large-scale adsorption towers of activated carbon should be selected to treatment VOCs, and the two system reduce the air pollution fee of 1,042,928 dollars and 1,581,576 dollars, respectively.