FIELD: chemistry.
SUBSTANCE: described is a Fischer-Tropsch synthesis method where: raw gas containing CO and H2, obtained from coal gasification, is desulphurised and then fed as starting gas into a Fischer-Tropsch synthesis apparatus (3) in which hydrocarbons are formed via catalytic reactions from carbon monoxide and hydrogen, wherein the hydrocarbons are removed in form of liquid products (4), a gas stream containing CO and CO2, coming out of the Fischer-Tropsch synthesis apparatus (3) is compressed and fed into a conversion area (6) in which CO is converted with steam to H2 and CO2 and gas coming out of the conversion area (6) after purification (9, 14), from which CO2 and/or other components except H2 are removed, is fed back as gas with high content of H2 together with the desulphurised starting gas into the Fischer-Tropsch synthesis apparatus (3), characterised by that a partial stream (8) of the desulphurised starting gas is removed and fed before a compressor (5) into a loop with a circulation gas stream and that in the gas stream fed into the Fischer-Tropsch synthesis apparatus (3), molar ratio of H2 to CO is set at least equal to 1.5:1. Also described is an installation for carrying out said method, said installation comprising: a Fischer-Tropsch synthesis apparatus (3) with a reactor and an apparatus for separating liquid products, a pre-switched on apparatus (2) for desulphuration of raw gas containing CO and H2, which is formed during coal gasification (1), an apparatus for returning the gas stream coming from the Fischer-Tropsch synthesis apparatus (3) into the desulphurised starting gas, fed into the Fischer-Tropsch synthesis apparatus (3), wherein the apparatus for returning the gas stream has a compressor (5) which operates on steam from a converter (6) for converting CO to H2 and CO2 and an apparatus (9, 14) for removing CO2 from the circulating gas stream, characterised by that the apparatus for returning the gas stream is linked to with a main line for feeding desulphurised starting gas through a branching line (8), wherein the branching line (8) is connected before the compressor (5) in the direction of flow with the returning apparatus, and that in the gas stream fed into the Fischer-Tropsch synthesis apparatus (3), molar ratio of H2 to CO can be at least 1.5:1.
EFFECT: high output of the product without considerably increasing the cost of the equipment.
10 cl, 2 dwg
