Numerical Simulation On Treatment Of Volatile Organic Compounds Benezene By Regenerative Thermal Oxidizer

With the increasingly strict emission standards of volatile organic compounds in China.Destruction and removal rate（DRE）was studied by simulating combustion process of benzene,using k^epsilon model,species transport model and P1 radiation model.The numerical simulation of temperature field,velocity field and component field showed that a reflux region occurred close to the burner inlet,resulting that a high temperature area appeared nearby the inlet of Regenerative Thermal Oxidizer（RTO）.The concentration of benzene decreased and that products increased in the outlet of RTO.The DRE of benzene was close to 99%,which met required operating parameters by comparatively analysing the difference of simulation and practice.Meanwhile,the effects of the rate of mass flow,molar ratio of benzene to air,temperature of combustion chamber and the coefficient of excess air on DRE of benzene were studied by numerical simulation.The result indicated that the rate of mass flow had a large effect on DRE when it was between0.001 and 0.003 kg·s^-1.Molar ratio of benzene to air had little effect on the DRE of benzene.The impact of temperature of combustion chamber on the DRE of benzene had slight a fluctuation on experimental condition.The DRE of benzene was close to 99%when the coefficient of excess air was more than0.95.Finally,the response surface method was used to analysis the DRE of benzene among the rate of mass flow,molar ratio of benzene to air,temperature of combustion chamber and the coefficient of excess air.Results indicated that the rate of mass flow and the coefficient of excess air had the most remarkable effect on DRE of benzene.