Influence of municipal solid waste injection on blast furnace smelting process
China's municipal solid waste is generated in large quantities,and the energy it contains is also very con-siderable.Other wastes in the municipal solid waste are mainly composed of hydrocarbons,which have a high calo-rific value and can be used in some of the processes in the iron and steel industry.It can achieve the resource utiliza-tion of the hydrocarbon component of municipal solid waste,while reducing its own fossil fuel consumption and corre-sponding carbon emissions.Based on the calculation of material balance and heat balance,the influence of blast fur-nace injection of municipal solid waste on coal ratio,raceway adiabatic flame temperature,gas properties and blast furnace carbon emission were analyzed and discussed.The results show that the decomposition heat of municipal solid waste is 1 731.69 kJ/kg,which is higher than that of pulverized coal.At a fixed raceway adiabatic flame tem-perature of 2 121℃,the maximum volume of municipal solid waste instead of pulverized coal injection is 73 kg,and at a fixed oxygen volume percent of 22%in the blast,the maximum volume of municipal solid waste instead of pul-verized coal injection is 83 kg.The amount of bosh gas decrease with the increase of the amount of municipal solid waste injection.The proportion of H2 in the bosh gas increases with the increase of the amount of municipal solid waste injection.The production of 1 t pig iron can reduce carbon emissions by up to 169 kg when 40%of MSW pul-verized products are inject 1:1 instead of pulverized coal.Based on the calculation of material balance and heat bal-ance,the maximum volume of blast furnace injection of municipal solid waste instead of pulverized coal is 83 kg,which is close to the waste plastics injection rate of foreign blast furnaces.After the injection of municipal solid waste,the raceway adiabatic flame temperature of blast furnace remains within the range of empirical values in China,and the proportion of reducing gas in the bosh gas increases,the bosh gas index decreases,the utilization coefficient of the blast furnace increases,and the carbon emission decreases.The research results of can provide a theoretical basis for the development of pollution and carbon reduction technology by co-disposal of municipal solid waste in blast furnace ironmaking process.
municipal solid wasteblast furnace injectioncoal ratioraceway adiabatic flame temperaturecarbon emission
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