METHOD AND DEVICE FOR FORMING SYNTHESIS GAS FROM BIOMASS AND RESIDUAL MATERIALS

摘要

The invention relates to a method and device for forming synthesis gas from biomass. In a pyrolysis zone, the biomass is converted into a solid carbonization product (char) and into gaseous pyrolysis products. The gaseous pyrolysis products are burnt in a burner zone and supply the heat for the endothermic pyrolysis process and for an endothermic gasification process for forming synthesis gas. The carbonization products are fed to the gasification zone, in order to be converted, for example by means of steam, into H2 and CO. The fact that the gaseous pyrolysis products and the off-gases from the combustion zone are separate from the gasification zone results in a product gas with a high calorific value which is virtually free of nitrogen. The fact that the solid carbonization products from the pyrolysis process are fed to the gasifier results in a very pure product gas which is free of contaminants which are usually formed when gaseous pyrolysis products are converted into synthesis gas. The device according to the present invention can therefore be operated without using complex purification installations.