钢铁企业CO_2排放模型及减排策略

CO_2 emission model and reduction strategy of the steelmaking industry

建立了钢铁企业CO2排放数学模型.以国内某钢铁企业为例,根据生产数据计算得到CO2年排放量,分析了能源结构和产品结构对CO2排放的影响.利用情景分析法对钢铁企业CO2减排的途径和策略进行了分析,假设天然气取代动力煤、短流程取代长流程、考虑先进工序能耗水平和使用余热回收技术四种情景.分析对比结果表明:余热回收技术的采用对CO2减排效果较小,约为3.39%;用短流程取代长流程的CO2减排效果最好,约为45.07%,若考虑电炉用电产生的间接CO2排放,仍可实现减排24.30%.

A mathematical model of CO2 emissions in iron and steel enterprises was established,and based on production data from a domestic steel plant,the amount of annual CO2 emissions of the steel plant was calculated by using this model.The influences of the used energy types and the produced steel types on CO2 emissions were discussed.Scenario analysis was conducted to analyze the effects of different ways and strategies on the reduction of CO2 emissions,with four scenarios assumed：using natural gas instead of all the steam coal,using EAF processes to replace integrated steelmaking,considering feasible lowest process energy consumption（FLPEC）and applying waste heat recovery technology.The result shows that the using of waste heat recovery technology has little effect on CO2 emissions,and only 3.39% of CO2 emissions would be reduced;however,using EAF processes to replace integrated steelmaking has the most effective impact on the reduction of CO2 emissions,it would reduce 45.07%,and even if indirect CO2 emission,which is caused by EAF electricity consumption,is counted,the reduction of CO2 emissions would still reach 24.30%