Heavy industry (steel, cement and chemicals)

Assembled from 14 blocks · 2 evidence · 10 related

1. Story
2. The sectors where the emissions are not mainly a fuel choice. Iron and steel and cement each account for something in the region of seven to eight per cent of global carbon dioxide emissions and bulk chemicals for several per cent more, but the composition of those emissions differs from power generation in ways that determine what can be done. Primary steelmaking by the blast-furnace and basic-oxygen route uses coke twice — as the energy source and as the chemical reducing agent that strips oxygen from iron ore — so carbon dioxide is a stoichiometric product of the reaction, not merely a combustion by-product, at roughly one and a half to two tonnes per tonne of crude steel. Cement emits carbon dioxide from the limestone itself during calcination, before any fuel is considered. Both processes also need process heat at temperatures a resistance heater does not comfortably reach at industrial scale: a cement kiln runs at around fourteen to fifteen hundred degrees Celsius, a blast furnace hotter still at the tuyeres. The available answers are therefore not "electrify" but a menu of harder ones — hydrogen direct reduction, more scrap through electric arc furnaces, alternative cement chemistries and clinker substitution, and carbon capture — each of which raises cost in a commodity market with thin margins and international competition, which is why the sector's decarbonisation is a trade-policy problem as much as an engineering one. Not a place.
3. Knowledge
4. Heavy industry (steel, cement and chemicals)
5. Process emissions from calcination
6. Connections
7. The electrified share of final energy
8. Process emissions from calcination
9. Hydrogen direct reduction of iron
10. HYBRIT delivers the first hydrogen-reduced steel
11. Heavy industry (steel, cement and chemicals)
12. Evidence
13. Supports the account of blast-furnace reduction chemistry, the clinker calcination process emission and its approximate share of cement emissions, the process heat temperature requirements, and the abatement option set of hydrogen direct reduction, scrap-based electric arc steelmaking, clinker substitution and carbon capture. V55 verification basis: neither roadmap was retrieved in this session; publication years are stated as the author recalls them and should be confirmed, and all quantitative shares in the citing objects are given as ranges.
14. Supports the sectoral emission structure used throughout this pack, the treatment of industry process emissions as distinct from energy emissions, the assessment of technology cost declines in solar, wind and storage, and the identification of aviation, shipping and heavy industry as hard-to-abate. V55 verification basis: not retrieved in this session; no chapter, table or page number is cited because none could be confirmed, and every sectoral share attributed here is given as a range rather than a figure.