Study on Numerical Simulation of Hydrogen Coal Co-injection in Blast Furnace Tuyere
Hydrogen is a carbon free clean energy source with good reducibility,which can replace some blast furnace coal powder injection,and injecting hydrogen gas into the tuyere can reduce the coal ratio and decrease the carbon emissions of the blast furnace.Based on numerical simulation methods,a three-dimensional steady-state model of hydrogen injection into blast furnace tuyere is established to study the effects of injecting different contents of hydrogen and oxygen on coal powder combustion and swirling zone state characteristics.The simulation results indicate that the heat generated by hydrogen combustion can promote coal powder devolatilization,but hydrogen combustion consumes a large amount of oxygen,reducing the oxygen concentration around volatile matter and affecting the combustion efficiency of volatile matter.When hydrogen is injected into the blast furnace,the oxygen consumption rate increases,the amount of CO2 produced significantly decreases,the amount of H2 and steam generated increases,but the CO content decreases from 42.5%to 38.7%,and the coal powder burnout rate decreases from 69.8%to 66.4%.When the oxygen enrichment rate increases by 2%,the average temperature at the outlet of the tuyere increases by 22 K,the combustion rate of coal powder increases by 2.3%,and the amount of CO produced increases from 38.7%to 40.0%.The research results provide theoretical guidance and data support for the operation of hydrogen coal co-injection in blast furnaces.
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