Sulfur-tolerant methanation system and method for coal-based natural gas

Abstract

The invention discloses a sulfur-tolerant methanation system and method for coal-based natural gas, and belongs to the technical field of coal-based natural gas. Firstly, a coal gasification process combining crushed coal gasification and pulverized coal gasification is adopted, and a sulfur-tolerant methanation process combining an adiabatic reactor and a uniform-temperature reactor is used for carrying out methane synthesis on raw gas, so the effective content of methane in the synthesis gas is improved, and the reaction load of a subsequent working section is reduced; sulfide and carbon dioxide in the raw gas are removed through a conventional purification process; and finally qualified civil natural gas is produced through a deep methanation process combining the adiabatic reactor andthe uniform-temperature reactor. According to the process system, comprehensive utilization of raw coal is realized, the production load of the methanation process is effectively reduced, the sizes ofthe reactor and pipeline equipment are reduced, and the unit capacity is improved; and the strong heat release characteristic of the methanation reaction is fully utilized to produce medium-pressuresteam and high-quality supersaturated steam, so the heat in the process system is reasonably utilized, the energy consumption is reduced, and the production efficiency is high.

Description

technical field [0001] The invention belongs to the technical field of coal-to-natural gas, and relates to a methanation process for comprehensive utilization of raw coal, in particular to a sulfur-resistant methanation system and method for coal-to-natural gas. Background technique [0002] Today's environmental problems are becoming more and more serious. The extensive use of fossil energy has led to the intensification of the greenhouse effect. The resulting global warming, natural disasters and severe weather have attracted more and more attention from human beings. Realize the comprehensive and efficient use of coal and reduce polluting gases Emissions and improving energy utilization are the consensus of current energy development; the use of coal-to-natural gas technology can transform coal into cleaner natural gas, greatly reduce pollutant emissions, and achieve efficient use of coal resources. [0003] At present, the industrialized mature coal-to-natural gas techno...

AI Technical Summary

Problems solved by technology

Such a long process and multiple sets of reaction heat exchange devices lead to high investment and complicated operation of the methanation process

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