Some Results of Preliminary Studies to Create an Industrial Reactor for Oxidative Torrefaction of Biowaste

Abstract

The torrefaction process of biowaste types, such as a mixture of chicken manure and wood sawdust, wood sawdust and sunflower husk, is proposed to be carried out in a fluidized bed, which is formed by the crushed biowaste, blown from the flue gases leaving the boiler. The preliminary studies of the oxidative torrefaction process showed that the time of biomass particles in such reactor may not exceed 5 minutes. In order to ensure the indicated time of the biomass particles in the oxidation torrefaction reactor, it is proposed to place a number of vertical partitions installed at a distance of 50 mm from each other in a fluidized bed. These partitions provide a loop-like movement of biowaste material from the place of loading into the reactor to the place of unloading. As studies on a cold apparatus showed, these partitions can provide the necessary time in the reactor and a set degree of biowaste treatment. For a reactor with a diameter of 1 m, the presence of such a package of partitions provides the time of biomass particles in a fluidized bed for 5 minutes with a reactor productivity of 300 kg/h in the initial biomass or 150 kg/h in the resulted biochar.