STRAIGHT-FLOW-COUNTERFLOW FURNACE FOR CALCINATION OF CARBONATE MATERIALS Russian patent published in 2020 - IPC F27B1/02 C04B2/12 

FIELD: furnaces.

SUBSTANCE: invention relates to shaft furnaces for calcination of carbonate materials and can be used in metallurgical, construction, chemical, food and other industries. Furnace contains two wells with heating zones with heat regeneration, burning and cooling of the ready product. Shafts are connected by a transition channel arranged on the boundary of the roasting and cooling zones with a cross-section at the level of the arch of the transition channel in the form of a segment, the base of which is directed towards the transition channel, the peripheral part in the form of a semicircle and the inner part in the form of a rectangle. At that, shafts up to lower part of annealing zone are made with round section, and in lower part of annealing zone with smooth transition from round section to cross section at level of arch of transition channel, at that angle of inclination to horizon of walls in lower part of annealing zone is 75–90°, and at level of arch of transition channel section width of inner part is equal to radius of semicircular section of part periphery.

EFFECT: technical result consists in reduction of capital costs and improvement of quality of calcined lime.

1 cl, 7 dwg