Input-output method-based blast furnace-converter long-process steel production process CO2 emission examining method

An input-output method-based blast furnace-converter long-process steel production process CO2 emission examining method is used for examining the emission load of CO2 per ton of steel of a long-process steel plant on the basis of consumption data of raw materials going in and out of the steel plant and energy. The examining method comprises the steps that firstly a material inlet, an energy source inlet, a product outlet and an emission outlet of a production system of the steel plant are determined and form the system boundary of the steel plant; the consumption of the raw materials going in and out of the system boundary and that of energy items are counted, and the CO2 emission of each raw material or that of each energy item is obtained by multiplying the consumption of the raw material or that of the energy item by a CO2 emission coefficient; the CO2 emission of all material items entering the system and that of the energy items are summed, and the summed result is subtracted by deduction carbon equivalent values of byproducts and emissions to obtain the total CO2 emission of the plant; the total CO2 emission is divided by total steel output to obtain the CO2 emission value per ton of steel of the steel plant. Although the precision is not high, the examining time and manpower demands can be remarkably reduced by using secondary data of the steel plant.