Numerical investigation on the optimized arrangement of secondary air in incinerator based on CFD
To study the influence of secondary air layout and front and rear wall wind speed on the flow field,temperature field,and pollutant generation concentration inside incinerator,CFD numerical simulation was conducted to investigate a 200t/d municipal solid waste incinerator.software FLIC and FLUENT were used respectively to simulate the combustion process of dense waste bed and the gaseous phase combustion inside furnace chamber.A customized program was developed using the secondary development platform to achieve the coupling of FLIC and FLUENT data.The simulation results indicate that,in the scenario that secondary air is arranged in staggered manner,front wall wind speed(21.657m/s)should be slower than rear wall wind speed(40.220m/s)to keep the main flue gas flow located in the center of furnace and reduce the vortex generated at the root of secondary air,which leads to a more uniform airflow distribution and a higher filling degree of flue gas in furnace.While secondary air is arranged in a countering manner,front wall wind speed is roughly equal to back wall air wind(33.413m/s)so that high-temperature flue gas is kept in the middle of furnace.Furthermore,a minimum CO concentration(41.64mg/m3)was found in the scenario of staggered arrangement of secondary air,the front wall wind speed(21.657m/s)is slower than the rear wall wind speed(40.220m/s),The secondary air arrangement manner introduced in this paper is favourable to reduce energy consumption and improve combustion efficiency,which provides reasonable technical parameters for design of incinerator.
numerical investigationarrangement of secondary airincineratorCFD
国家科技期刊平台
NSTL
万方数据
