Heating method of double-hearth lime shaft kiln

The invention provides a heating method of a double-hearth lime shaft kiln, and belongs to the technical field of double-hearth lime shaft kilns. The heating method comprises a first heating stage, afirst heat preservation stage, a second heating stage, a second heat preservation stage, a third heating stage, a third heat preservation stage, a fourth heating stage and a fourth heat preservation stage which are sequentially carried out in a direct connection channel of the double-hearth lime shaft kiln, wherein the heating rate of each heating stage is less than or equal to 15 DEG C/h; the heat preservation temperature of the first heat preservation stage is 142.5-157.5 DEG C, the heat preservation temperature of the second heat preservation stage is 285-315 DEG C, the heat preservation temperature of the third heat preservation stage is 570-630 DEG C, and the heat preservation temperature of the fourth heat preservation stage is 855-945 DEG C. The method can effectively avoid the problems of brick burst, dama