HEAT TRANSFER SIMULATION AND ENERGY ANALYSIS OF RADIATIVE PYROLYSIS OF OILY SLUDGE
Aiming at the complexity of oily sludge radiation pyrolysis,the temperature field and heat transfer characteristics inside the pyrolysis furnace are unknown.The temperature distribution inside the pyrolysis furnace and the heating characteristics of the materials under different factors were investigated by Fluent software,using double Eulerian model,DO radiation model and multi-component model.The results indicate that the temperature distribution of the sludge in the furnace was divided into two stages of heating and constant temperature with the cut-off point of L/D=10,and 600 ℃ was the optimal pyrolysis final temperature.Meanwhile,higher water content prolongs the sludge pyrolysis time,while lowering the screw speed reduces the amount of final sludge remaining.In addition,setting a heat shield above the radiation tube can significantly improve the uniformity of the entire furnace temperature distribution.Finally,the total recovered energy of the pyrolysis products was 6592.25 kJ through the energy balance analysis of the whole pyrolysis system,with a maximum energy recovery rate of 82％.Among them,the pyrolysis gas energy accounts for 65.78％～90.11％of the total energy input of the system,which can greatly reduce the external energy supply required by the system.
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