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Method and system for preparing benzene from low-rank coal

A low-rank coal and high-quality coal technology, applied in the field of metallurgy, can solve the problems of low efficiency of direct combustion or gasification, inability to fully utilize resource value, high water content of low-rank coal, and achieve low processing difficulty, clean and efficient utilization, The effect of increasing yield

Pending Publication Date: 2017-05-24
SHENWU TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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  • Method and system for preparing benzene from low-rank coal
  • Method and system for preparing benzene from low-rank coal
  • Method and system for preparing benzene from low-rank coal

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Embodiment

[0123] The limestone is crushed to less than 45mm, and the particle size of 5~45mm is selected, and it is transported to the coke oven for firing via a belt. The low- and medium-rank coal is crushed to below 25mm, with a particle size of 5-25mm, and transported to the coke oven for pyrolysis via a belt. The mass ratio of middle and low rank coal to limestone is 1:2, and the heating temperature of the coke oven combustion chamber is 1000°C. After 12 hours of firing and pyrolysis, the upgraded coal and quicklime enter the mixing tank for mixing, and the mixed material is loaded into the high-level trough of the calcium carbide production system, and then loaded into the calcium carbide furnace to produce calcium carbide. The produced calcium carbide is cooled and crushed, the particle size of the calcium carbide is controlled between 50 and 80 mm, and then enters the acetylene generator to react to obtain acetylene. Through this system, about 348kg of acetylene, 88kg of hydrogen...

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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...

Claims

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Application Information

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IPC IPC(8): C07C2/48C07C15/04C07C5/09C07C11/04C10L9/08C10H21/00C04B2/10C01B32/942C01B32/40
CPCC04B2/10C07C2/48C07C5/09C10H21/00C10L9/08C10L2290/02C07C15/04C07C11/04Y02P40/40
Inventor 许梅梅闫琛洋朱元宝史雪君杜少春吴道洪
Owner SHENWU TECH GRP CO LTD
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