Simulation And Optimization Of Acrylonitrile Off-gas Purification Process With An Annual Output Of 106 Thousand Tons

Acrylonitrile is an important chemical raw material, mainly produced by ammoxidation of propylene. However, the production process is accompanied by a large number of harmful by-products, such as propane, propylene, CO, NOx and a small amount of acrylonitrile,seriously endangering the environment. Jilin Chemical Group Company acrylonitrile plant set up exhaust catalytic combustion system. At present,the catalyst used in the plant is imported noble metal catalyst, there are too high cost, easy to generate NOx and other issues.Now study which used domestic catalysts (the active ingredient is Cu-ZSM-5) to replace the imported noble metal catalyst on acrylonitrile exhaust gas treatment process after the original. The new technology has the advantage that the NH3-SCR reactor is not needed, the auxiliary fuel is not consumed, the operating temperature is low, the effect is good, the heat can be recovered, the exhaust gas is low, which can effectively reduce the cost and improve the treatment effect. This paper through the material balance, heat accounting, ancillary equipment selection completed an annual output of 106,000 tons of acrylonitrile exhaust gas treatment process simulation. In addition this paper used the computational fluid dynamics (CFD) software to study and discuss a series of factors, such as exhaust gas inlet temperature and speed, which affect the effect of tail gas treatment in industrial practice through theoretical calculation. Optimize the process indicators, the industry has a guiding significance.