Experimental investigation of torrefied biomass pyrolysis
Two-step gasification is a promising technique to produce syngas from biomass. In a two-step gasification process biomass is first pyrolysed and the pyrolysis vapours are then gasified. The first step of this process has been investigated in a downer setup using torrefied biomass.
The pyrolysis process is investigated by varying three process parameters: torrefaction degree of the feedstock, temperature and equivalence ratio. Both the pyrolysis vapours and char produced in the experiments are examined. The amount and quality of the pyrolysis vapours are used to draw conclusions about the optimal parameters for the pyrolysis process. The produced char is analysed to determine the commercial applicability. The results show that briquetting is a suitable application for the char. Other applications need further examination.