Activated Carbon Fiber Adsorption / Desorption-Condensation Process To Recover Solvents In Exhaust Gas From Electronics Industry

With the rapid development of the modern electronics industry,more and more organic waste gas is also produced.Most of the VOCs(Volatile Organic Compounds)discharged into the atmosphere are toxic,which is not only harmful to human health,but also causes the growth of animals and plants Great influence.Therefore,if we can economically and efficiently recover the waste gas generated in the processing and production of the electronics industry,not only can we reduce production costs and obtain economic benefits,but also protect the environment,which is of great significance for the development of China's circular economy.In this study,taking Tianchang Yunchuang Electronic Technology Co.,Ltd.as an example,through the adsorption / desorptioncondensation experimental study,the optimal adsorption operation and solvent gasoline recovery process parameters were obtained to provide a basis for further engineering design and application,while achieving VOCs Compliance.The experimental results show that the activated carbon fiber has a good adsorption effect on the low-concentration volatile organic waste gas produced by the electronics industry.In the adsorption experiment,the greater the concentration of inlet VOCs,the shorter the penetration time and the equilibrium time,and the larger the equilibrium adsorption capacity of the activated carbon fiber for volatile organic gases;The equilibrium adsorption of volatile organic gases is reduced;increasing the intake air temperature,the penetration time and the equilibrium time are shortened,and the equilibrium adsorption of volatile organic gases by the activated carbon fibers is gradually reduced;increasing the height of the packed bed,and penetrating Both the time and the equilibrium time will be prolonged,and the equilibrium adsorption capacity of the activated carbon fibers for volatile organic gases will gradually increase;increasing the particle size of the activated carbon fibers,the equilibrium adsorption capacity of the activated carbon fibers for the volatile organic gases will gradually increase,and the adsorption saturation time will be shortened.The optimal process parameters for the adsorption are 0.041 m/s intake air velocity and 25°C intake air temperature.In the desorption experiment,the temperature of nitrogen has a great influence on the desorption effect.From the perspective of energy saving,60°C is a suitable desorption temperature.As the nitrogen flow rate increases,the desorption rate increases.The faster the desorption rate,the Attached time is shortened.The optimal process parameters for desorption are 60°C desorption temperature and 0.082m/s nitrogen flow rate.In the condensation experiment,at the same concentration of the condensation inlet,the lower the condensation temperature,the higher the recovery rate of condensation;when the condensation temperature is the same,the higher the concentration of the condensation inlet,the higher the recovery rate of condensation;When the condensation temperature is low,the condensation recovery rate is not high,indicating that the concentration of the condensation inlet is too low to be easily recovered;as the temperature of the gas entering the condenser increases,the condensation recovery rate at different condensation temperatures increases.From the point of view of energy saving,the optimal process parameter of condensation is the condensation temperature-15°C.In addition,the equilibrium adsorption capacity of activated carbon fibers does not change much after regeneration.After 7 times of repeated regeneration of activated carbon fibers,the adsorption amount of volatile organic gases is slightly reduced,but the rate of decline is very slow.Still has very good adsorption capacity.