Granular solids cooling line

A line for cooling hot granular solids, the temperature of which is greater than 1000° C., the cooling line comprising:

• a first device for producing a first flow of cooling air,
• a first cooler equipped with at least one grate intended to receive the granular solids, said grate being able to be traversed by the first flow of cooling air,
• a second cooler arranged downstream of the first cooler in the direction of movement of the granular solids, said second cooler being rotatable and comprising a material inlet through which the granular solids enter and a material outlet through which the granular solids leave and wherein a second flow of cooling air circulates,
• said cooling line being configured so that the granular solids move successively from the first cooler to the second cooler, said cooling line comprising an air extraction circuit including an air extraction device, the air extraction circuit being able to produce in part said second flow of cooling air,
• said air extraction device being able to extract a first fraction of the second flow of cooling air.