沸石转轮浓缩及蓄热氧化处理印刷挥发性有机废气

Treatment of Volatile Organic Compounds from Printing by Zeolite Wheel Adsorption and Regenerative Thermal Oxidizer

以印刷VOCs废气为研究对象,对沸石转轮浓缩及RTO系统的工艺参数及设备参数进行详细设计,对热回收效率、净化效率、达标排放及能源消耗进行分析论证。结果表明:进气浓度、燃烧温度、停留时间、热回收效率、净化效率、系统压降等关键工艺参数进行了设计计算,满足《蓄热燃烧法工业有机废气治理工程技术规范》(HJ1093-2020)相应条款要求;RTO日均热回收效率介于94.04%~95.10%,符合95%设计预期;沸石转轮装置对BAC和NMHC的日均净化效率符合95%设计预期;RTO装置对BAC和NMHC的日均净化效率略低于99.9%的设计预期,推断可能的原因是进出气零泄漏垂直提升阀存在微量泄漏;BAC排放浓度和排放速率满足《印刷工业大气污染物排放标准》(DB32/4438-2022)标准,NMHC排放浓度和排放速率满足《印刷工业大气污染物排放标准》(DB32/4438-2022)标准;系统正常运行时,电力和天然气的小时用量折算15.61kg标准煤。

Taking the VOCs exhaust gas from the floor color film printing process as the research object,a detailed design was conducted on the process parameters and equipment parameters of the zeolite runner concentration and RTO system.Analysis and demonstration were conducted on the heat recovery efficiency,purification efficiency,standard emissions,and energy consumption.The results show that key process parameters such as intake concentration,combustion temperature,residence time,heat recovery efficiency,purification efficiency,and system pressure drop have been designed and calculated,which meets technical specifications of HJ1093-2020;The daily average heat recovery efficiency of RTO ranges from 94.04%to 95.10%,which meets 95%design expectations;The daily average purification efficiency of the zeolite rotary device for BAC and NMHC meets 95%of the design expectation;The daily average purification efficiency of the RTO device for BAC and NMHC is slightly lower than the design expectation of 99.9%,and it is inferred that the possible reason is the slight leakage of the inlet and outlet zero leakage vertical lift valve;The emission concentration and rate of BAC meet emission standard of DB32/4438-2022,while the emission concentration and rate of NMHC meet emission standard of DB32/4438-2022;During normal operation of the system,the hourly consumption of electricity and natural gas is converted to 15.61kg of standard coal.