Iron and Steel coke

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Metal industry methodology, coke production. Calculates carbon dioxide (CO2), methane (CH4) and CO2e emissions based on the quantities of materials consumed and produced. Globally applicable.

Summary

This methodology represents carbon dioxide (CO2) and methane (CH4) emissions associated with the production of coke. The data and calculation methodology is sourced from the Greenhouse Gas Protocol (GHGP) worksheet tool CO2 emissions from the production of iron and steel, version 2.0, which is ultimately based on the methodologies described in Volume 3, Chapter 4 - Metal Industry Emissions of their 2006 IPCC Guidelines for National Greenhouse Gas Inventories.


The methodology

Emissions model

Metallurgical coke is the solid product obtained from the carbonisation of coal (predominantly 'coking coal' ) at high temperature, and is used as a blast furnace feedstock in the production of iron and steel. As well as producing coke, this process produces coke oven gas, CO2, CH4 and other by-products.

This methodology enables the calculation of coke-associated CO2 emissions based upon a mass balance approach that accounts for the carbon inputs and outputs to coke ovens. By considering the carbon entering the process via the carbon-bearing feedstocks (typically coking coal, blast furnace gas and other materials), and the carbon leaving the process within coke, oven gases and other by-products, the discrepancy can be assumed to have been emitted as CO2.

CH4 emissions are based on an emissions factor which describes the rate at which CH4 is emitted per unit quantity of coke produced. This includes iron converted, and not converted, into steel.

This methodology represents the IPCC Tier 2 approach where default carbon content data is used for carbon-bearing feedstocks and products, but Tier 3 where these are based on facility-specfic data.

Model data

This methodology is based on a mass-balance of process inputs and outputs, and depends upon quantities and carbon concentrations for each. Default carbon content data is provided for a selection of 21 carbon-bearing feedstocks (including blast furnace gas) as well as the coke and coke oven gas (by-)products for cases where facility-specific data is not available.

Activity data required

CO2 emissions require quantities of feedstocks (including blast furnace gas specifically) and of coke, coke oven gas and other (by-)products in order to calculate. In addition, the methodology enables the specification of facility-specific data carbon content data where this is available. CH4 emissions also require the quantity of coke produced to be specified. A default emissions factor for CH4 is available but can be specified if facility- or country-specific data is available.

Calculation and results

CO2 emissions are calculated by the mass-balance of the specified input/output activity data. CH4 emissions are calculated by multiplying the quantity of coke specified by the appropriate emissions factor. CO2e emissions are also calculated by converting absolute emissions using the appropriate global warming potentials.


Related methodologies

If feedstock and by-product data is unavailable, a simpler methodology based solely on quantities of coke produced is also available.

IPCC methodologies for other iron and steel-associated process emissions are also available, including tier 1 and tier 2/3 methodologies for iron and steel production, direct reduced iron and sinter production.

UIDLabel
A19M39FPBZDP Blast Furnace Gas
NAIUNPB0ZKHY Charcoal
LAPA16ERRDPM Coal
E0G21Y9DEV74 Coal tar
Z01OVN3JJNZU Coke
9JFXIKLWFD6N Coke Oven gas
VC0CHHLB4T0U Coking Coal
ZSGW07B4H5HR Direct reduced Iron (DRI)
7GWB2KBV0FP5 Dolomite
27ZSF32TJ5C5 EAF Carbon Electrodes
5N4X9SN96T0G EAF Charge Carbon
7VIAY9B92A6L Fuel Oil
HTCQ69W2Y3M0 Gas Coke
93BPX1425YCU Hot Briquetted iron
HBNMAN8W9LKW Limestone
4R2EZBY0C6G4 Natural Gas
GKA9XX98JA5A Oxygen Steel Furnace Gas
YOCFHAW8PPB3 Petroleum Coke
F9B7JV5PWC90 Purchased pig Iron
ZJTYQX5JUZKP Scrap Iron
Quantity of consumed blast furnace gas
Quantity of by-products produced
Quantity of coke oven gas produced
Quantity of coke produced
Quantity of feedstock consumed
Carbon content of blast furnace gas consumed (percent weight)
Carbon content of by-products (percent weight)
Carbon content for feedstock (percent weight)
CH,,4,, emissions per unit of coke produced
Carbon content of produced coke (percent weight)
Carbon content of coke oven gas produced (percent weight)