FIELD: methods of roasting limestone.
SUBSTANCE: proposed method is based on use of regenerative shaft furnace with at least two shafts interconnected by bypass passage; material to be roasted in these shafts is passed through upper preheating zone and lower cooling zone. Air for combustion is fed to preheating zone. Cooled air is fed to cooling zone and gaseous combustion products having calorific power below 7.5 MJ/m3 are fed to each shaft in turn. Gaseous combustion products are preheated in heat exchanger mounted outside the furnace by removal of part of process gas from furnace bypass passage.
EFFECT: improved quality of product at enhanced thermal efficiency due to use of gaseous combustion products at low calorific power.
5 cl, 1 dwg
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