Scope 1 emissions include all Green House Gas (GHG) emissions produced by a steelmaker. They cover direct emissions made from plant and equipment owned or controlled by the reporting business. Examples include the off-gases that come from a blast furnace; or the emissions that may come from a slab reheat furnace. Most steps in the iron asnd steelamking process produce some quantity of greenhouse gases. The table below lists typical scope one emission levels from different process steps.
Scope 2 emissions, which refer to indirect emissions from the generation of purchased energy, are excluded from the estimates shown below.
|Steelmaking step||CO2 output, tons / ton|
|Blast furnace / thm||1.219|
|DRI (natural gas)|
|Electric arc furnace - carbon steel|
|Electric arc furnace - alloy steel|
|Open hearth furnace||1.72|
|Slab, billet mill or ingot shop|
|Hot strip mill|
|Cold rolling mill|
|Hot dip galvanising line|
|Organic coating line||0.003|
|Bar or wire rod mill|
Note that table above shows indicative emissions values for typical operations, based on a compilation of public sources. Full analysis with identification of all sources used is available for purchase for $250+VAT. Actual output of GHG's may however vary significantly. For example, bar mill or hot strip mill emissions may differ markedly if there is a high or low proportion of billet or slab hot charging. Similarly, coke plant carbon dioxide output much depends on whether by-product recovery is used. With recovery, typical CO2 production is approximately 0.5 ton/ton coke. Without recovery, this can increases to around 1.25 t/t.
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