Environmental Engineering Reference
In-Depth Information
Energy Consumption
As the steel making industry is an energy-intensive industry and this energy constitutes
up to 20% of the cost of steel making, energy consumption has become a major fac-
tor affecting global competitiveness. As shown in Figure 5, the major input of energy
consumption is coking coal (73.8%); others are BF injection coal (16.1%), electricity
(5.1%), steaming coal (3.8%), etc. Moreover, considering the various changes in the
international market and the shortage of natural resources, CSC felt it necessary to
refocus on energy efficiency and reducing the consumption rate. Hence, an advanced
steel making technology was created and is used in CSC. Compared with the energy
consumption in 1979, the relative index shows that it has been reduced by 20% in 2006
as previously reported by CSC (Figure 6).
Figure 5.
Major inputs and outputs and flowchart (dry basis, for each ton of steel produced) [41].
Figure 6.
Energy consumption of CSC, 1979-2006 (relative index) [44].
Reduction of Process Residues and Recycling Toward Zero Waste
The CSC zero waste philosophy in environmental matters leads to the recycling, re-
use, conservation and by-products production of useful mineral products, materials,
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