Design And Application Of VOCs Treatment Scheme In Gravure Printing Factory

In recent years,with the rapid expansion of Chinese industrial scale,the problemof atmospheric pollution has become increasingly serious.As one of the important factors causing air pollution,volatile organic compounds(VOCs)have attracted the attention of the Chinese environmental protection agencies.At present,relevant policies and regulations on the emission of VOCs was formulated in china.Many regions have established local standards for VOCs emissions and have started to levy VOCs emission fees for printing factory.Therefore,it is great significance and urgency to study a VOCs treatment technology with reliable operation,high efficiency of degrading VOCs,and low energy consumption in the printing industry.The gravure printing workshop in Shandong province was taken as the research object.Through the workshop's on-site investigation and research,a VOCs treatment and co-use device was designed for the VOCs emission of gravure printing workshops,and its technical principle and practical application were discussed.In this process,the following work was explored.(1)The research is based on field surveys conducted at the gravure workshop.The VOCs generated during the printing process were collected and analyzed.Then,according to the situation of on-site sampling and monitoring,the GC-MS sample analysis method was used to the laboratory analysis on VOCs samples collected on site,which laid the foundation to next-step plan.(2)Through the on-site investigation of the emission situation and major components of the VOCs in the gravure workshop,the VOCs treatment combined with the respective characteristics of the current VOCs treatment technologies in the printing industry was designed.The combination of non-thermal plasma technology and UV photolysis treatment technology was determined as the main method for the treatment of VOCs in the program.(3)Based on the contents of VOCs treatment program,a VOCs co-use device was designed in this paper.The combination of non-thermal plasma treatment device and UV photolysis treatment device was taken as the main unit for the treatment of VOCs.After the VOCs collected from the printing process,the organic waste gas and the odorous gas were effectively decomposed and purified through a dry filter,non-thermal plasma treatment device and UV photolysis treatment device.At the same time,the mechanism of two kinds of treatment technologies was also discussed in this paper.(4)In this study,the application inquiry and the effect analysis to the VOCs treatment united device were carried,and the factors influencing the degradation efficiency of VOCs were discussed.According to the results,for non-thermal plasma treatment device,the degradation rate of VOCs was affected by the electrical parameter,the role of hydrocarbons,and solid particle impurities.For the UV photolysis treatment device,the treatment efficiency of this part of the whole device was affected by the ambient temperature,relative humidity,ozone concentrationgenerated by the photolysis reaction,and residence time of VOCs in the equipment.According to the third-party professional organization testing report,the removal rate of VOCs in gravure printing workshops reached 56.2%,which is in line with the emission standards for VOCs in the printing industry in Shandong Province.In summary,a set of effective VOCS treatment programs was designed in this study and used for production.The practice testing proves that,while ensuring the purification removal rate,the program can greatly reduce energy consumption,and achieve the purpose of simultaneous removal of bacterial and volatile pollutants.Therefore,this program will have great potentiality of broad market application in the field of volatile organic gas treatment.