METHOD AND APPARATUS FOR PRODUCING SYNTHESIS GAS FROM BIOMASS

摘要

The invention relates to a method and apparatus for producing synthesis gas (7) from biomass (2). The method comprises a step for producing raw product gas (3), and a purifying step comprising several processing steps performed in gas processing means (10, 12, 13, 14) for converting the raw product gas (3) to synthesis gas (7). One processing step is a carbon dioxide removal step for separating carbon dioxide from the stream of raw product gas (3) in a gas processing means comprising a gas purificator (10). The method comprises a step for feeding a stream of the carbon dioxide (9) from the gas purificator (10) to at least one part of the apparatus, said at least one part of the apparatus being selected from: the biomass supply system (4), the gasifier (6) and at least one of the gas processing means (10, 12, 13, 14).