System for producing hydrocarbons by high-temperature Fischer-Tropsch synthesis

A system for producing a hydrocarbon by high-temperature Fischer-Tropsch synthesis, comprising a Fischer-Tropsch synthesis unit for making synthesis gas undergo a Fischer-Tropsch synthesis reaction, a reaction water separation unit for separating reaction water generated during a reaction, and a catalyst reduction unit for reducing catalyst;

• wherein
• in the Fischer-Tropsch synthesis unit, fresh synthesis gas with H2 and CO as main components are mixed with synthesis circulating gas, pass through a synthesis gas preheater to be heated to a temperature of not lower than 100° C., enter a fluidized bed Fischer-Tropsch synthesis reactor to undergo the Fischer-Tropsch synthesis reaction under an action of a Fischer-Tropsch synthesis catalyst over the reaction temperature range of 300-500° C., a pressure of 1.0-5.0 MPa, and an operating linear velocity of 0.3-1.0 m/s;
• heat of high-temperature gas from the fluidized bed Fischer-Tropsch synthesis reactor is recovered by a waste heat boiler;
• the high-temperature gas after heat is recovered by the waste heat boiler is washed and cooled by a quench tower and sent to a three-phase separator for separation to obtain a water phase, an oil phase and a gas phase;
• the oil phase is sent to a product processing unit as a light oil product, the water phase is sent to the reaction water separation unit after decompression, and the gas phase, after discharging part of purge gas, passes through a synthesis recycle compressor, as the synthesis circulating gas, to return to an inlet of the fluidized bed Fischer-Tropsch synthesis reactor.