Based on the theory of computational fluid dynamics(CFD),pulverized coal combustion alone,and the co-combustion of pulverized coal and refuse-derived fuel(RDF)in a Trinal-sprayed calciner(TTF)precalciner were simulate...Based on the theory of computational fluid dynamics(CFD),pulverized coal combustion alone,and the co-combustion of pulverized coal and refuse-derived fuel(RDF)in a Trinal-sprayed calciner(TTF)precalciner were simulated.The results revealed that when coal was used as a single fuel,the velocity field in the precalciner had good symmetry,and formed three spray effects and multiple recirculation zones.The main combustion zone was distributed in the lower tertiary air and pulverized coal area,and the highest temperature reached up to 1,500 K.According to the simulation results,the predicted decomposing rate of raw meal was 90.12%,which is in good agreement with the actual measured result.In addition,with the increase in RDF content,the average temperature of the furnace,the decomposition rate of the raw meal,and the NO_(x) concentration all exhibited a downward trend.Under the condition of ensuring the normal operation of the precalciner,blending with 20%RDF is the most reasonable strategy,and the NO_(x) emissions decreased by approximately 16%.展开更多
基金the General Institute of Building Materials Research of China(No.2017YFC0210801)the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD)。
文摘Based on the theory of computational fluid dynamics(CFD),pulverized coal combustion alone,and the co-combustion of pulverized coal and refuse-derived fuel(RDF)in a Trinal-sprayed calciner(TTF)precalciner were simulated.The results revealed that when coal was used as a single fuel,the velocity field in the precalciner had good symmetry,and formed three spray effects and multiple recirculation zones.The main combustion zone was distributed in the lower tertiary air and pulverized coal area,and the highest temperature reached up to 1,500 K.According to the simulation results,the predicted decomposing rate of raw meal was 90.12%,which is in good agreement with the actual measured result.In addition,with the increase in RDF content,the average temperature of the furnace,the decomposition rate of the raw meal,and the NO_(x) concentration all exhibited a downward trend.Under the condition of ensuring the normal operation of the precalciner,blending with 20%RDF is the most reasonable strategy,and the NO_(x) emissions decreased by approximately 16%.
