Distinctive Features of the Pyrolysis and Gasification of Biomass in Microwave Heating in a CO2 Medium

The influence of a CO2 reactive medium and of a volume in the range 200–600 mL on the yield of basic components (CO, CO2, H2, and CH4) of a producer gas in microwave heating of biomass has been investigated. The dependences of the moderate and maximum concentrations of the gases on the volume of carbon dioxide fed to the chamber of a microwave reactor have been determined. Trends of variation in the concentrations of the enumerated gases with time have been obtained. Times of the onset of release of the concentrations of the gas components and their duration with variation of the CO2 volume fed to the chamber have been established. The influence of the feed of reactive gases on the mass of the char has been investigated. It has been shown that the injection of CO2 into the reactor chamber exerts a positive influence on the intensification of microwave pyrolysis of the biomass, with the result that the yield of volatiles of the formed gas mixture rises.