Comprehensive utilization process for low-carbon-emission Fischer-Tropsch synthesis tail gas

Abstract

The invention discloses a comprehensive utilization process for a low-carbon-emission Fischer-Tropsch synthesis tail gas. The process is used for converting the non-circular tail gas generated after the Fischer-Tropsch synthesis reaction into synthesis gas containing hydrogen through water vapor reforming, and then separating and extracting high-purity hydrogen from the synthesis gas containing hydrogen for use. The comprehensive utilization process comprises the following steps: 1) obtaining converted gas through a water vapor conversion reaction, 2) obtaining a hydrocarbon fuel through a Fischer-Tropsch synthesis reaction, 3) converting a hydrocarbon compound containing two or more than two carbon atoms into methane after a pre-reforming reaction, 4), converting methane and water vapor into hydrogen and carbon monoxide through a reforming reaction, 5) separating gases respectively containing hydrogen and carbon monoxide, 6) and providing heat for a reforming reactor. The process disclosed by the invention can be used for effectively utilizing the Fischer-Tropsch synthesis tail gas, especially the tail gas containing a large amount of inert components, and converting the tail gas into the hydrogen for use. Meanwhile, the comprehensive utilization process disclosed by the invention can be used for effectively utilizing residual combustible components after the hydrogen in the reforming gas is separated, thereby enhancing the utilization efficiency of the energy.

Description

technical field [0001] The invention relates to a Fischer-Tropsch tail gas treatment process containing inert gas components, in particular to a low-carbon discharge Fischer-Tropsch synthesis tail gas comprehensive utilization process. Background technique [0002] Fischer-Tropsch synthesis is the process of producing fuel and chemicals from synthesis gas formed by converting fossil energy such as coal and natural gas or renewable energy such as biomass under the action of a catalyst. It plays an important role in reducing dependence on petroleum route energy and chemical production and utilizing clean energy. In particular, the Fischer-Tropsch synthesis process, which uses biomass as raw material to produce syngas, has greatly reduced the dependence on fossil energy. [0003] In addition to long-chain liquid hydrocarbons, Fischer-Tropsch products also include low-carbon hydrocarbons with three carbon atoms (C3) and below, and become the main component of tail gas, of which...

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Problems solved by technology

[0004] Chinese patents CN1354779A and CN1761734A respectively announced a process for Fischer-Tropsch synthesis to produce liquid hydrocarbons, but did not pay attention to the tail gas produced in the process

[0005] In the method disclosed in Chinese patent CN101538483A, the CO produced in the process is 2 Supply the urea synthesis section, so as to realize the CO 2 Nearly zero emissions, but a special synthetic ammonia section is required for this purpose, and the construction cost of the urea synthesis plant is high

However, the processes of gasification, shifting and decarbonization are complicated and the investment in equipment is relatively high.

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