Lime kiln device with application of hot-air

The invention relates to a lime kiln device with hot-air calcination and a method for producing lime by the utilization of the lime kiln device. When preparing lime, hot air generated from a combustion apparatus outside a kiln is used for calcination of limestone; waste hot air used after the calcination is used for preheating of the limestone mineral aggregate; the waste hot air used after preheating is discharged out of the kiln body, and then undergoes dedusting and finally used for preheating of coal gas and oxidizing air. Through the use of hot air for calcination of limestone, lime quality can be remarkably improved, lime yield is raised, and productivity is enhanced. The lime kiln proposed by the invention is not provided with a burner system, and the hot air for high temperature calcination is from a combustion furnace device outside the kiln. Blast-furnace gas can be used as a fuel for the combustion furnace device, and hot flue gas generated by the combustion device can be used as the hot air. There