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 steps that 1, limestone and the low-rank coal are crushed respectively, so that limestone crushed aggregates and low-rank coal powder are obtained; 2, the limestone crushed aggregates are fed into a coke oven for firing, so that calcined lime and carbon dioxide are obtained; 3, the low-rank coal powder is fed into the coke oven for upgrading, so that upgraded coal and raw coke oven gas are obtained; 4, the upgraded coal and the calcined lime are mixed and thermally conveyed into a calcium carbide furnace for a calcium carbide reaction, so that calcium carbide and carbonic oxide are obtained; 5, the calcium carbide is crushed and then reacts with water in an acetylene generator, so that acetylene is obtained; 6, the acetylene, hydrogen and methane in the raw coke oven gas generated in the step 3, the carbon dioxide generated in the step 2 and the carbonic oxide generated in the step 4 are fed into an acetylene-into-benzene reactor for reacting, so that benzene and a by-product, namely ethylene, are obtained. By means of the method, transformation from low-value coal to high-value-added benzene can be achieved.

Description

Technical field [0001] The present invention relates to the field of metallurgical technology. Specifically, 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 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, the efficiency of direct combustion or gasification is low and existing technologies cannot make full use of its resources. Value has led to 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 grading and utilization, and vigor...

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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