Method and system for preparing benzene with low-rank coal

Abstract

The invention discloses a method and system for preparing benzene with low-rank coal. The method comprises the following steps: (1) drying and grinding low-rank coal; (2) burning limestone in a lime kiln; (3) grinding raw lime; (4) mixing and briquetting the low-rank coal powder and raw lime powder to obtain material pellets; (5) supplying the material pellets into a revolving bed pyrolysis device for pyrolyzing treatment to obtain pyrolyzed pellets, coal tar and pyrolysis gas containing hydrogen, methane, carbon monoxide and lightweight hydrocarbon; (6) performing calcium carbide reaction on the pyrolyzed pellets to obtain calcium carbide and carbon monoxide; (7) reacting the calcium carbide with water in an acetylene generator to obtain acetylene; and (8) introducing acetylene, hydrogen in crude gas, methane, carbon dioxide and carbon monoxide into an acetylene prepared benzene reactor, and reacting to obtain benzo byproduct ethylene. The method can be used for maximally preparing benzene by utilizing coal, so that low-value coal can be converted to benzene with high additional values.

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...

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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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