Method and system for preparing benzene from low-rank coal

Abstract

The invention discloses a method and system for preparing benzene from low-rank coal. The method comprises the following steps: (1) carrying out drying and crushing treatment on the low-rank coal; (2) carrying out firing treatment on limestone in a lime kiln; (3) carrying out crushing treatment on quick lime; (4) mixing the low-rank coal powder and the quick lime powder and carrying out ball pressing treatment to obtain material pellets; (5) supplying the material pellets into a coke oven and carrying out quality improvement treatment to obtain coal tar, raw coal gas and quality-improved pre-heated pellets; (6) carrying out calcium carbide reaction on the pre-heated pellets to obtain calcium carbide and carbon monoxide; (7) taking the calcium carbide to react with water in an acetylene generator to obtain acetylene; (8) introducing the acetylene, hydrogen and methane in the raw coal gas, carbon dioxide and the carbon monoxide into an acetylene benzene preparation reactor to react, so as to obtain a byproduct, namely benzoethylene. By adopting the method disclosed by the invention, the benzene can be prepared at maximum by utilizing coal, so that the conversion from the coal with low value to the benzene with high additional value is realized.

Description

technical field [0001] The present invention relates to the technical field of metallurgy, and in particular, the present invention relates to a method and system for preparing benzene from low-rank coal. Background technique [0002] my country's energy pattern has always been rich in coal, poor in oil, and little in gas, with coal reserves reaching 17% of the world's coal reserves. Among them, low-rank coal resources such as lignite and long-flame coal 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, the direct combustion or gasification efficiency is low, and the existing technology cannot make full use of its resources. value, resulting in a huge waste of coal resources. In April 2015, the National Energy Administration released the Action Plan for Clean and Efficient Utilization of Coal (2015-2020), which significantly improved the status of coal classification and util...

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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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