Jiuju Cai, Tao Du, Aihua Wang SEPA Key Laboratory on Eco-industry, Northeastern University, P.O. Box 345, Liaoning 110004, China,
<正>Based on the real manufacturing data from 1980 to 2002 in Chinese steel industry, the important change of crude steel production, energy consumption and environmental impacts and prominent achievements are summarized. The results shows that the crude steel production increased 391%, from 37 million tons to 181 55 million tons from 1980 to 2002, while the average comprehensive energy consumption of per ton crude steel dropped 47.11%, from 2.04 to 1 079 tce/t (1 tce is equal to 29.6 GJ), and carbon dioxide intensity (carbon dioxide emission expressed in tons of carbon per ton crude steel) dropped 45%. The half of prominent achievement of energy saving in Chinese steel industry is due to direct energy saving (through reducing process energy consumption), and the other due to indirect energy saving (through adjusting the ratio of other products to steel). The energy consumption of per ton crude steel in Chinese steel industry is higher than that in developed countries because of higher ratio of ore to steel, ratio of hot metal to steel, and higher process energy consumption of BOF steel, EAF steel and assistant processes. The main approach of energy saving and environmental load reduction in the future 20 years in Chinese steel industry is therefore drawn as follows. We should optimize manufacturing processes and adjust construction structures of Chinese steel industry, and further decrease the ratio of other products to steel and unit energy consumption of relevant processes, especially assistant processes. We should improve the recovery and utilization efficiency of residual heat and energy and reduce the environmental load in Chinese steel industry.
process energy consumption, environmental load, ratio of other products to steel, E-P analysis, assistant processes, Chinese steel industry
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