Ferroalloy methane emissions
[edit / update model]The heating of carbon materials in the furnace releases volatiles including methane. With open or semi-covered furnaces – predominantly used for FeSi and Si ferroalloy production - most of the volatiles will burn to CO2 above the charge, in the hood and off-gas channels, but some will remain un-reacted as CH4 and NMVOC. The amounts depend on the operation of the furnace. Sprinkle-charging will reduce the amounts of CH4 compared to batch-wise charging. Increased temperature in the hood (less false air) will reduce the content of CH4 further. The errors associated with estimates or measurements of N2O emissions from the ferroalloys industry are very large and thus, a methodology is not provided.
How to use this category
Selecting an emissions scenario
To use this category use the typeOfAlloy drill-down to select the alloy type being used from the following options:
- si-metal
- fesi 90
- fesi 75
- fesi 65
- unknown
- batch-charging
- sprinkle-charging
- sprinkle-charging and over 750 degrees C
Specifying activity data
The only required profile item value is productQuantity. The emission factor has a default value provided by the Discover engine, but this can be over-ridden, using the massCO2PerMassProduct profile item value, by the user if more precise site or country-specific values are known. If using a site-specific emissions factor, the calculation represents the tier 2 IPCC NGGIP methodology.
Results and calculation
The returned amounts represent the CH4 emissions associated with the quantity specified. Two quantities are returned, as follows:
- CH4: CH4 (methane) emissions
- CO2e: CO2e emissions (CH4 converted using these global warming potential)
UID | Label |
---|---|
R22K7J5JHD3T | fesi 65, batch-charging |
IIZPT9V0YDYG | fesi 65, sprinkle-charging |
VV97UNM5H0HR | fesi 65, sprinkle-charging and over 750 degrees C |
B77UYSE9R57C | fesi 65, unknown |
KXJRGOJV2Z6G | fesi 75, batch-charging |
0F19I6XZTSYV | fesi 75, sprinkle-charging |
10VRNC8KLK1F | fesi 75, sprinkle-charging and over 750 degrees C |
6YIMNJCL92ZQ | fesi 75, unknown |
9AAS5G2HFYDJ | fesi 90, batch-charging |
V8QIDXT30X7H | fesi 90, sprinkle-charging |
CP3D6D3PPVOL | fesi 90, sprinkle-charging and over 750 degrees C |
40995KNGIRCM | fesi 90, unknown |
U9PG32KY22C3 | si-metal, batch-charging |
66O59HF7WCKV | si-metal, sprinkle-charging |
ADF65OQT2HYY | si-metal, sprinkle-charging and over 750 degrees C |
F1XSAD7E9Q7P | si-metal, unknown |