FIELD: chemistry.
SUBSTANCE: invention relates to chemical industry. Method involves gasification stage (1), where carbon dioxide is used as a gasification agent. Obtained synthesis gas is cooled by means of primary heat exchanger (2) and secondary heat exchanger installed in series. In primary heat exchanger (2) coolant used is carbon dioxide which is pre-heated, and in secondary heat exchanger coolant used is water to obtain steam. Cooled synthesis gas is fed into cyclone separator (4) and gas cleaner (5). Purified synthesis gas reacts with steam so that part of carbon monoxide is converted into hydrogen and carbon dioxide. That is followed by desulphurisation (8) of modified synthesis gas and decarbonisation (9). Further, synthesis gas is fed into synthesis column (10), where by catalytic reaction it is converted in oil products, and exhaust gas contains carbon dioxide. Method includes decarbonisation (11) of exhaust gas and obtained carbon dioxide is recycled by feeding into primary heat exchanger (2) as coolant and subsequent supply for gasification (1) as a gasification agent.
EFFECT: invention enables to achieve a zero emission of carbon dioxide of system as a whole.
13 cl, 3 dwg
