Research progress on ammonia-coal co-combustion in industrial applications
As China's energy consumption increases,the energy supply should be ensured while reducing the use of coal is imperative.Therefore,the exploration of alternative fuels becomes necessary.Consequently,in recent years,ammonia-coal combustion technology,which partially substitutes ammonia for pulverized coal combustion,has attracted widespread attention.It means that ammonia-coal co-combustion technology is highly regarded for its po-tential to reduce pollutants emitted from coal combustion and improve energy utilization efficiency.The latest develop-ments in the research field of ammonia-coal co-combustion were demonstrated,including studies on flame morpholo-gy,coal powder ignition and ignition delay time,flame propagation mechanism,and Nox emissions.The combus-tion characteristics and emission characteristics of ammonia-coal co-combustion under different combustion strategies and burner configurations were summarized,some significant breakthroughs achieved in the industrial application of ammonia-coal co-combustion technology worldwide were analyzed,the potential challenges for future research were discussed.The reaction pathways and mechanism models of ammonia-coal co-combustion are complex and vary under different conditions,which requiring further clarification of the multiple roles of intermediate substances.Moreover,there is a need for in-depth research on the influence of gas components on the generation of coal powder and NOx.Currently,research on ammonia-coal co-combustion ignition and the reduction of Nox emissions predominantly con-centrate on macroscopic rules,although some studies have commenced analyzing intermediate products during the co-combustion process.Nevertheless,there exists a dearth of fundamental research,and the mechanisms remain ambig-uous.The challenge in designing suitable burners and the immaturity of technologies highlight the need for further op-timization.In the future,further research can be conducted on improving the ammonia blending ratio and reducing pollutant emissions,the application of ammonia coal mixed combustion in large-scale industries such as thermal power plants can be achieved.
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