CO 2 Emission Calculation Model of Integrated Steel Works Based on Process Analysis
33
Fig. 3 Flow chart of carbon metabolism of converter process
fuels into the EAF. As for the output end, carbon is discharged from the system
in the form of liquid steel and furnace gas. If ignoring the carbon entrained in the
slag, all the carbon in the furnace gas which is not collected at all, is regarded as
technical emission of CO 2 and the CO 2 emission from fuel combustion is regarded
as combustion emission.
In addition, the EAF consumes enormous electricity during the smelting operation.
The electricity does not cause CO 2 emission directly in the EAF process. However,
it is necessary to estimate the indirect emissions from the consumed electricity used
in EAF process to study the effect of electricity consumption on CO 2 emissions.
Therefore, considering the unique energy structure of EAF, the carbon emissions from
the EAF contain not only technical emission, combustion emission but electricity
emissions. Electricity emissions are further classified into the CO 2 emission from
consuming purchased electricity by enterprises and the CO 2 emission from the selfpowered electricity of the enterprise.
Total Direct CO 2 Emissions and Emission Intensity
As mentioned above, for most processes, the CO 2 emissions in iron and steelmaking
are classified into combustion emission and technical emission. The combustion
emission refers to the CO 2 emission resulting from the combustion of purchased
fossil fuels or by-product gases, and the technical emission refers to the CO 2 emission
from non-combustion processes, such as the coking and the thermal decomposition
of limestone and dolomite, etc. The sum of the two types of emissions is called total
direct CO 2 emissions, which is shown in formula 1.
33
Fig. 3 Flow chart of carbon metabolism of converter process
fuels into the EAF. As for the output end, carbon is discharged from the system
in the form of liquid steel and furnace gas. If ignoring the carbon entrained in the
slag, all the carbon in the furnace gas which is not collected at all, is regarded as
technical emission of CO 2 and the CO 2 emission from fuel combustion is regarded
as combustion emission.
In addition, the EAF consumes enormous electricity during the smelting operation.
The electricity does not cause CO 2 emission directly in the EAF process. However,
it is necessary to estimate the indirect emissions from the consumed electricity used
in EAF process to study the effect of electricity consumption on CO 2 emissions.
Therefore, considering the unique energy structure of EAF, the carbon emissions from
the EAF contain not only technical emission, combustion emission but electricity
emissions. Electricity emissions are further classified into the CO 2 emission from
consuming purchased electricity by enterprises and the CO 2 emission from the selfpowered electricity of the enterprise.
Total Direct CO 2 Emissions and Emission Intensity
As mentioned above, for most processes, the CO 2 emissions in iron and steelmaking
are classified into combustion emission and technical emission. The combustion
emission refers to the CO 2 emission resulting from the combustion of purchased
fossil fuels or by-product gases, and the technical emission refers to the CO 2 emission
from non-combustion processes, such as the coking and the thermal decomposition
of limestone and dolomite, etc. The sum of the two types of emissions is called total
direct CO 2 emissions, which is shown in formula 1.