Investigation of 3D flow and heat transfer in solid-fuel grate combustion: Measures to reduce high-temperature degradation

摘要

Undue deterioration of grate material can lead to increased maintenance costs in solid fuel furnaces. Excessive grate temperatures and reducing conditions at the grate surface are conditions that increase the probability of material degradation. To investigate measures to avoid these conditions, and thus reduce grate degradation, an unsteady, three-dimensional numerical model is employed to predict char combustion near the surface of a grate for a variety of scenarios. The parameters studied include the inlet air flux, the thickness of the ash layer on the grate, and the shape of the grate itself; both the size of the passages through the grate and the spacing between them.