From equations of energy transportation, we deducted the TS temperature of the solid fuel bed and Tg of gas.
Taking into account the results of elemental analysis and immediate analysis, solid and gaseous species used to simulate their transport equations are: Dry fuel (biomass), char, CH 4, O 2, CO, H 2O, CO 2, and N 2. A literature review allowed us to describe the stages of combustion in terms of mathematical equations. In this work, it comes to realize a numerical modeling of the combustion of biomass in a fixed grate furnace. The treatment method most used for the recovery of waste is incineration because this method of treatment can minimize the volume of waste. The combustion of biomass not only falls in energy production, but also in the recovery of waste.