Analysis Of Scrap Resources And Regeneration Efficiency In China

Substance flow analysis is an effective method to research industrial metabolization of a particular substance or compound substance in a nation or a region.At the same time,it is important stuff when the government implements industrial policy.We choose elements flow ananlysis with the concept of time to study the circulation state of steel in China,which is put forward by academician Pro.Wu and based on the life cycle chart of substance.We obtain the iron-flow diagram of steel product life cycle in 2012 by means of elements flow ananlysis based on substance flow analysis.Main classification of steel products each year in this paper has been analysed.We draw a conclusion that the average life-span of steel products is 20 years through calculating all kinds of steel products' life-span.We accurately describe the forming and retrieving approaches of steel scrap during the stages the production,fabrication and manufacture,using,retrieving from old scrap products through a large amount of investigation and research.Recoverable quantity of home,new and old scrap is calculated from 1980 to 2013.We have successfully drawn the analysis model of social steel stock,which is based on the iron balance.Besides,social steel stocks and social steel stocks per capita steel have been calculated out from 1980 to 2012.The value is 6.22 billion tons and 4.6 tons per capita in 2012 respectively.It is estimated that social steel stock will reach 13.7 billion tons(9 tons per capita)in 2030,indicating that industrialization is basically completed in China.Several important equations between the recycling indexes,such as iron resource efficiency,steel ore index,steel scrap index,self-produced depreciation scrap regeneration index and the flow:ing parameter,such as recycling rate,retrieving rate,production ratio,emission rate,are deduced from following-observing model of scrap cycle.Steel resource efficiency,steel ore index,steel scrap index,self-produced depreciation scrap regeneration index are calculated from 1980 to 2012 through direct and indirect calculation method.Equation of carbon emission is deduced from improving the IPAT model.Steel production for China in 2010-2030 are forecasted according to a transformation relation between carbon emissions and steel production.Steel production peak will reach 0.91 billion tons in 2020 and reduce to 0.59 billion tons in 2030.Improving application of scrap will make a contribution to energy saving and emission and green development.Self-produced depreciation scrap regeneration index can mearsure the sufficient degree of iron regenerated resources in iron and steel industry.Steel consumption function has an important influence on self-produced depreciation scrap regeneration index.Relation between steel consumption function and self-produced depreciation scrap regeneration index has been analyzed.At last,we quantitatively analyse the old scrap regeneration benefits for iron and steel industry.