The invention relates to a compound
lime kiln, comprising a
kiln body, a charging equipment, a discharging equipment, a
control system and an exhaust
system.A preheating zone, a\calcining zone and a cooling zone are in the
kiln body. A
smoke outlet or a fume extractor is arranged in the preheating zone, and the
smoke outlet or the fume extractor is connected with the exhaust
system. A cooling
tuyere is arranged in the cooling zone, and a cooling air inlet is connected with a cooling fan. Two to four granule kiln bins are arranged in the device. Granule hoppers, granule charging locks and cooling air outlets are arranged in the granule kiln bins. The underpart of the granule kiln bins are connected with the cooling zone. The cooling air outlet is connected with the exhaust
system. Granule kiln bins are arranged in the device in the invention,
exhaust gas after
lime cooling is utilized to preheat granule limestone materials, and simultaneously
large particle and granule materials are calcined, so that the preheating fully utilizes resources of limestones, effectively utilizes energy, reduces consumption and improves productivity. The cooling air does not enter the calcining zone, which is beneficial to an improving of calcining effects of the calcining zone, a reducing of a
pressure load of the kiln body and an improving of qualities of the
lime products.