Computational Model of Greenhouse Gases Emissions in Iron and Steel Industry and Its Application

摘要

Under the guidance of international standards for carbon emissions, two greenhouse gases (GHGs) accounting models have been established for integrated iron and steel enterprises. One is the enterprise, and the other is the process as a whole boundary, so they are named the enterprise model and the process model respectively. The enterprise model obtains the carbon emissions through the balance of carbon input and output of the enterprise boundary. The process model obtains the carbon emissions through the balance of carbon input and output of the process boundary under the condition of considering the enterprise inner circulation. A case study using the two models was also made in an integrated iron and steel enterprise. Results show that the enterprise's main carbon emissions are from fuel combustion. Thus, reducing fuel consumption is of great significance to the steel industry in the aspect of energy conservation and emissions reduction. The enterprise model can account for enterprise's overall carbon emission and can be applied to government appraisal of the enterprise's carbon emissions. The process model can not only check out process emissions, but also effectively quantifies enterprise internal material flow, energy flow and by-product circulation effects on carbon emissions. It can also provide the basis for internal carbon emission assessment mechanism within an enterprise.