Ferroalloy methane emissions

[/business/processes/production/ferroalloy/ch4]

The category business/processes/production/ferroalloy/ch4 is aimed towards industry professionals to enable them to prepare inventories of greenhouse gas emissions from ferroalloy production. This category is designed for use alongside the ferroallloy tier 1 or tier 2 categories. The methodology provided in this category represents the Tier 1 (default) and Tier 2 (user-supplied) approach for CH4 emissions calculation described by the IPCC Guidelines for National Greenhouse Gas Inventories (NGGIP).

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:

  1. si-metal
  2. fesi 90
  3. fesi 75
  4. fesi 65
A second drill-down must then be specified using the operationOfFurnace drill-down to select the operation type of the furnace used, from the following options:

  1. unknown
  2. batch-charging
  3. sprinkle-charging
  4. sprinkle-charging and over 750 degrees C
If unknown is selected, the default values used are those for sprinkle-charging operation.

Specifying activity data

The only required profile item value is productQuantity. The emission factor has a default value provided by the CarbonKit 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)
The individual quantity for CH4 represents an absolute quantity rather than a CO2e quantity.

 UIDLabel
6T7AX4QQV0PX fesi 65, batch-charging
UC0A8V9TP9TA fesi 65, sprinkle-charging
DMEYP9AV4UDS fesi 65, sprinkle-charging and over 750 degrees C
DCZBDMP78QD4 fesi 65, unknown
0NYVUM0QM04A fesi 75, batch-charging
OC9OM7GGG50K fesi 75, sprinkle-charging
LJDB6882WO80 fesi 75, sprinkle-charging and over 750 degrees C
QK9GYWI6NZ0K fesi 75, unknown
KFFOQD6IIWB8 fesi 90, batch-charging
MHMQJW8JTAWL fesi 90, sprinkle-charging
EE3OTAMA7TVI fesi 90, sprinkle-charging and over 750 degrees C
HZJVHTXK8K67 fesi 90, unknown
GQSM5T8H4AQS si-metal, batch-charging
6ORLU9XSM0HS si-metal, sprinkle-charging
0F6IBUYIO31H si-metal, sprinkle-charging and over 750 degrees C
ASRVFAZKS9BP si-metal, unknown
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Name: Ferroalloy_methane_emissions
Full path: /business/processes/production/ferroalloy/ch4
Parent Category: Ferroalloy production
Provenance: IPCC-NGGIP