Process for comprehensively utilizing low carbon emission Fischer-Tropsch synthesis tail gas

摘要

Disclosed is a process for comprehensively utilizing low carbon emission Fischer-Tropsch synthesis tail gas. In the process, a non-cycling tail gas generated after a Fischer-Tropsch synthesis reaction is steam reformed and converted into a hydrogen-rich synthesis gas, and then highly purified hydrogen is separated and extracted from the hydrogen-rich synthesis gas for use. The process comprises the following steps: 1) conducting a steam conversion reaction to obtain converted gas; 2) conducting a Fischer-Tropsch synthesis reaction to obtain a hydrocarbon fuel; 3) after a pre-reforming reaction, converting a hydrocarbon compound containing two or more carbon atoms into methane; 4) conducting a reforming reaction to convert the methane and steam into hydrogen and carbon monoxide; 5) separating the hydrogen and carbon monoxide from the gas; and 6) providing heat for a reforming reactor. The present invention effectively utilizes the Fischer-Tropsch synthesis tail gas, especially a tail gas containing a large amount of inert constituents, and converts the tail gas into the hydrogen for use. Furthermore, the present invention effectively utilizes the residual combustible constituents in the reformed gas after the hydrogen is separated, thus improving energy utilization efficiency.