Method and system for preparing benzene from low-rank coal

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

Pending Publication Date: 2017-05-24
SHENWU TECH GRP CO LTD
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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

Examples

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Embodiment 1

[0146] Crush the limestone to less than 45mm, choose a particle size of 5-45mm, and transport it to the coke oven for firing by belt. The medium and low-rank coal is crushed to below 25mm, and the particle size is selected to be 5-25mm, and it is transported to the coke oven for pyrolysis through the belt. The mass ratio of medium 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 are pulverized until the particle size is less than 20 μm. The mixed material enters the ball pressing device for molding, and the formed pellets are put into the high-level trough of the calcium carbide production system, and then put Calcium carbide furnace produces calcium carbide. The calcium carbide produced is cooled and pulverized, and the particle size of the calcium carbide is controlled between 50 and 80 mm, and then enters the acetylene generator to react ...

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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...

Claims

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Application Information

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IPC IPC(8): C07C2/48C07C15/04C07C5/09C07C11/04
CPCC07C2/48C04B2/10C07C5/09C10H21/00C10L9/08C10L2290/02
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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