煤气化细渣炉前粒化直掺循环流化床锅炉的工业试验与燃烧机理研究OA

Coal gasification fine slag is one of the primary solid wastes generated during the coal gasification process,with an annual production of up to 80 million tons.It is characterized by high moisture content(typically 50％-65％),high residual carbon,and poor combustion properties.Current disposal methods commonly suffer from significant environmental pollution and high economic costs.Consequently,the resource utilization of coal gasification fine slag has become critical to development of the modern coal chemical industry.This study proposed and implemented a direct co-firing process for gasification fine slag in a 280 t/h circulating fluidized-bed(CFB)boiler.A specially developed granulation and broadcasting system was used to directly introduce gasification fine slag with a moisture content of 50％-65％into the dense phase zone of the furnace for fluidized-bed combustion.Results from industrial trials and third-party performance tests indicate that this process keeps the unburned carbon contents in fly ash and bottom ash,as well as the reduction in boiler efficiency,within engineering-permissible limits.The main steam parameters and feedwater temperature of the boiler remain stable,while the emission mass concentration of NOxand SO2 show a downward trend.Mechanistically,this study reveals a coupled granulation-dispersion-enhanced heat transfer combustion mechanism,overcoming the traditional technical limitation of mandatory pre-drying and clarifying the core scientific principles and operational window for direct co-firing of high-moisture gasification fine slag.This process achieves efficient,sustainable,and low-cost disposal of gasification fine slag,providing a practical and feasible technical solution and engineering practice basis for the large-scale resource utilization of gasification fine slag.