燃煤电站掺烧煤气化细渣燃烧特性数值模拟研究OA

Coal gasification stands as the pivotal technology driving the modernization of coal chemical industries and represents the cornerstone for achieving clean and efficient coal utilization.Nevertheless,the efficient and scalable utilization of coal gasification fine slag(GS)remains an unresolved challenge.Given its elevated fixed carbon content,co-firing GS with coal emerges as a highly promising strategy for its resource recovery.This study employed numerical simulation to investigate the influence of co-firing ratios(5％,10％,15％,20％),co-firing methods(D,ABCDE and BCD burner levels),and mean particle sizes of GS(67.6 μm,55.0 μm,35.5 μm,12.1 μm)on the combustion characteristics of a 330 MW tangentially-fired pulverized bituminous coal boiler.The optimal co-firing ratio,method,and particle size for co-firing GS with coal were identified through comprehensive evaluation.Results indicate that when the co-firing ratio is below 10％,no significant adverse effects are observed on boiler combustion stability,steam parameters,or boiler efficiency,and combustion remains controllable.Multi-layer co-firing,particularly with a lower heat input ratio per burner layer,minimizes the impact on combustion characteristics of the boiler.Reducing the particle size of GS within a certain range improves combustion performance;however,further reduction beyond this range degrades performance,indicating the existence of an optimal co-firing particle size of GS.The optimal co-firing ratio,method,and particle size for GS in tangentially-fired pulverized coal boilers was determined computationally.The study results can provide a foundation and technical basis for the large-scale utilization of GS in similar power plants.