Coal demand for steel production via basic oxygen blast furnace was 1.43 MWh_coal/t_steel. This assumption based on mpp steel tracker documentation is too low.

Specific Emissions Accounting

Using an emissivity of coal of 0.3361 t_CO2/MWh_coal (following technology-data) would lead to 0.48 t_CO2/t_steel.
Which contradicts e.g this source (p.2)

Comparing the primary steel production (35.4 Mt_steel) with the emissions of 51 Mt_CO2 (https://www.wvstahl.de/wp-content/uploads/WV-Stahl_Daten-und-Fakten-2024_RZ-Web.pdf) for Germany would also indicate a higher demand for coal.

Changes proposed in this Pull Request

Using the data from the mpp steel tracker for BAT BF-BOF I come up with a coal demand of 5.34 MWh_coal/t_steel.

Checklist

• Code changes are sufficiently documented; i.e. new functions contain docstrings and further explanations may be given in doc.
• Data source for new technologies is clearly stated.
• Newly introduced dependencies are added to environment.yaml (if applicable).
  not applicable
• A note for the release notes doc/release_notes.rst of the upcoming release is included.
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• I consent to the release of this PR's code under the GPLv3 license.