Chemistry: calcining limestone releases 0.79 t CO2/t lime before fuel. Total ≈1.2 t/t — higher than cement because lime is pure calcined product.
From our guide: Decarbonizing Lime — full context, charts and sources there.
Boilers, kilns, heat exchangers, valves and steam lines lose energy continuously. Inzonex makes patented (UK GB2508992.1) removable modular insulation — snap-fastened covers engineered per temperature tier, not generic off-the-shelf jackets: