Numerical simulation on co-combustion of sewage sludge and pulverized coal in TTF precalciner
Based on the theory of computational fluid dynamics(CFD),the co-combustion of pulverized coal and sewage sludge with different moisture content in a Trinal-sprayed calciner(TTF)precalciner were simulated.The temperature field,the concentration distributions of CaCO3 and NO were calculated under different working conditions.Also the decomposition rate of raw meal and the average NO concentration at the outlet were calculated.The results revealed that with the increase of sludge input under the constant moisture content of sludge,the average temperature of furnace,the decomposition rate of raw meal,and the NOx concentration all exhibited a downward trend.With the increase of moisture content of the sludge under the constant sludge input constant,the same trend occurred.Under the condition of ensuring the normal operation of precalciner,the moisture content of sludge and the sludge input should be in a reasonable range.These numerical results can provide reasonable instruction and theoretical basis for the design,operation and optimization of this type TTF precalciner.
万方数据
维普
