Abstract: A grate bar and a grate for stepped-grate furnace stoker with directed-air combustion. Its principle application is in the field of furnaces for waste conversion units. The bar includes a flat part, whose top surface receives the incinerated elements, and that extends into two rear and front ends each forming a return that acts as a support point for the bar. It also includes a longitudinal projection under the flat part, extending at least partially between the rear and front ends. At least one wing is positioned under the flat part, on a first side of the longitudinal projection. In a characteristic manner, this wing has at least one lateral hollow-out which, together with the lateral hollow-out of a wing of a neighbouring bar, forms a passage for channeling air up to the front end of the bar.

Abstract: A grate bar and a grate for a stepped-grate furnace stoker. The grate bar includes a flat part whose top surface is used to receive the incinerated elements, and the extends into a rear end and a front end, each forming a return that acts as a support point for the bar. The bar also includes a longitudinal projection located under the flat part, and that extends at least partially between the rear and front ends of the bar. At least one angled cutting element or knife is located under the flat part, on a first side of the longitudinal projection, whose function is to facilitate the removal of the refractory materials that have accumulated progressively. The grate includes at least one bar or group of three bars. In the second case, the central bar in the group is mobile in relation to the two lateral bars.