Method and system for preparing benzene from low-rank coal

Abstract

The invention discloses a method and a system for preparing benzene from low-rank coal. The method comprises the following steps: (1) respectively crushing limestone and low-rank coal; (2) firing crushed limestone to obtain quick lime and carbon dioxide; (3) upgrading coal powder to obtain upgraded coal and raw gas; (4) crushing the quick lime and the upgraded coal respectively; (5) mixing and balling upgraded coal powder and quick lime powder to obtain material pellets; (6) conveying the material pellets into a calcium carbide furnace for carrying out calcium carbide reaction to obtain calcium carbide and carbon monoxide; (7) crushing the calcium carbide, then enabling the calcium carbide to react with water in an acetylene generator to obtain acetylene; and (8) introducing acetylene, hydrogen and methane in the generated raw gas, the generated carbon dioxide and the generated carbon monoxide into a reactor for preparing benzene from acetylene to obtain benzene and a byproduct which is acetylene. The method is capable of converting low-value coal into high-value benzene.

Description

technical field [0001] The invention relates to the field of metallurgy technology, in particular, the invention relates to a method and system for preparing benzene from low-rank coal. Background technique [0002] my country's energy structure has always been rich in coal, poor in oil, and low in gas, and its coal reserves can reach 17% of the world's coal reserves. Among them, lignite, long-flame coal and other low-rank coal resources are abundant, accounting for more than 50% of my country's coal reserves and coal production. However, due to the high water content of low-rank coal, direct combustion or gasification efficiency is low, and existing technologies cannot make full use of their resources. value, resulting in a huge waste of coal resources. In April 2015, the National Energy Administration issued the "Action Plan for Clean and Efficient Utilization of Coal (2015-2020)", which significantly improved the status of coal classification and utilization, and vigorous...

AI Technical Summary

Problems solved by technology

Among them, lignite, long-flame coal and other low-rank coal resources are abundant, accounting for more than 50% of my country's coal reserves and coal production. However, due to the high water content of low-rank coal, direct combustion or gasification efficiency is low, and existing technologies cannot make full use of their resources. value, resulting in a huge waste of coal resources

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