Method and device for heating steel billets in heating furnace

The invention relates to the technical field of thermoengineering, in particular to a method and device for heating steel billets in a heating furnace. The method comprises the following steps that the steel billets are classified according to the length of steel grades to obtain a plurality of groups of rolling units, the plurality of groups of rolling units are sequentially loaded into the heating furnace, the first length difference between any two steel billets in each group of rolling unit meets a first preset condition, and the second length difference between the last steel billet of the previous group of rolling unit and the first steel billet of the next group of rolling unit in the adjacent rolling units meets a second preset condition; and in the process that the multiple groups of rolling units are sequentially installed in the heating furnace, the moving position of a steel charging machine is controlled so that the distance between any two adjacent steel billets can be controlled to be not large