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对钢铁生产的几种流程在研究的系统边界内进行编目分析,结果表明:吨铁产品累计CO_2排放量,直接还原海绵铁>高炉铁;吨钢产品累计CO_2排放量,BF-BOF流程的粗钢CO_2排放量最大,DRI-EAF次之,EAF最小,吨粗钢累计CO_2排放量BF-BOF流程高于EAF流程18%;CO_2排放主要在铁前工序,铁后工序CO_2排放量相对较少,因此减少铁前工序能耗是减少CO_2排放量的主要矛盾;由于我国吨钢能耗大于国外先进水平,导致CO_2排放量高于国外35%左右。
Several processes of steel production were cataloged and analyzed within the system boundary of the study. The results showed that: the accumulated CO 2 emissions per ton of iron products, direct reduction of sponge iron> blast furnace iron; cumulative CO 2 emissions per ton of steel products, and crude BF-BOF process The CO 2 emission of BF-BOF is 18% higher than that of EAF, the CO 2 emissions are mainly in the pre-iron process and the CO 2 emissions in the post-iron process are relatively less Therefore, reducing the energy consumption before the iron process is the main contradiction in reducing CO 2 emissions. As China’s energy consumption per ton of steel is higher than that of foreign countries, the CO 2 emission is higher than that of foreign countries by 35%.