Generation of a Gaseous Fuel by Gasification or Pyrolysis of Biomass for use as Reburn Gas in Coal-Fired Boilers

摘要

Biofuels attract increasing interest in power plant technology as sources of carbon dioxide neutral fuels. Besides using solid pulverised biomass as an additional fuel in coal-fired boilers a further possbility to run a combined coal and biomass process is to pre-pyrolyse or pre-gasify biomass and to inject the gas as reburn ruel into the coal-fired boiler. Within the pretreatment process the solid feedstock is separated into a high energy gas and a solid residue. The gas can be used as a reburn fuel in the coal-fired boiler with excellent NOx reduction properties. The spearation of coal and biofuel ash within this process enables a specialised use of both residuals.