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System and method for preparing light aromatic hydrocarbon by pulverized coal with heavy aromatic hydrocarbon recycling function

A technology for heavy aromatics and aromatics, which is applied in the field of producing light aromatics and can solve problems such as increasing demand for aromatics

Pending Publication Date: 2017-09-29
BEIJING HUAFU ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is mainly to solve the problems of clean and efficient utilization of medium and low-rank pulverized coal and increasing demand for aromatics, and to provide a system and method for producing acetylene and hydrogen from low-rank coal and quicklime, and then producing light aromatics from acetylene.

Method used

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  • System and method for preparing light aromatic hydrocarbon by pulverized coal with heavy aromatic hydrocarbon recycling function
  • System and method for preparing light aromatic hydrocarbon by pulverized coal with heavy aromatic hydrocarbon recycling function

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0124] Screen the pulverized coal with a particle size of less than 3mm, send the pulverized coal to the top of the fast pyrolysis device 1 through the conveyor belt, enter the fast pyrolysis device 1 for pyrolysis, the pyrolysis temperature is 800°C, and the pyrolysis time is 2s to generate semi-coke, gas and coal tar. Mix quicklime and semi-coke at a mass ratio of 3:2, add an appropriate amount of binder, and press balls to control the diameter of the pellets to 10-40mm. The ball is sent into calcium carbide furnace 6 to produce calcium carbide. The calcium carbide produced is cooled and pulverized, the particle size of the calcium carbide is controlled between 50-80mm, and it enters the acetylene generator 7 to react to obtain acetylene.

[0125] Through this system, 393kg of acetylene, 67kg of hydrogen, 179kg of methane, 32kg of carbon dioxide and 450kg of carbon monoxide can be obtained from 1000kg of medium and low-rank pulverized coal and 900kg of quicklime. The resul...

Embodiment 2

[0127] Screen the pulverized coal with a particle size of less than 3mm, send the pulverized coal to the top of the fast pyrolysis device 1 through the conveyor belt, enter the fast pyrolysis device 1 for pyrolysis, the pyrolysis temperature is 500°C, and the pyrolysis time is 30s to generate semi-coke, gas and coal tar. Mix quicklime and semi-coke at a mass ratio of 2:1, add an appropriate amount of binder, and press balls to control the diameter of the pellets to 10-40mm. The ball is sent into calcium carbide furnace 6 to produce calcium carbide. The calcium carbide produced is cooled and pulverized, the particle size of the calcium carbide is controlled between 50-80mm, and it enters the acetylene generator 7 to react to obtain acetylene.

[0128] Through this system, 1000kg of medium and low rank pulverized coal and 1220kg of quicklime can obtain 401kg of acetylene, 63kg of hydrogen, 167kg of methane, 30kg of carbon dioxide and 457kg of carbon monoxide. The resulting ace...

Embodiment 3

[0130] Screen the pulverized coal with a particle size of less than 3mm, and send the pulverized coal to the top of the fast pyrolysis device 1 through the conveyor belt, and then enter the fast pyrolysis device 1 for pyrolysis. The pyrolysis temperature is 700°C, and the pyrolysis time is 15s. gas and coal tar. Mix quicklime and semi-coke at a mass ratio of 1:1, add an appropriate amount of binder, and press balls to control the diameter of the pellets to 10-40mm. The ball is sent into calcium carbide furnace 6 to produce calcium carbide. The calcium carbide produced is cooled and pulverized, the particle size of the calcium carbide is controlled between 50-80mm, and it enters the acetylene generator 7 to react to obtain acetylene.

[0131] Through this system, 1000kg of medium and low rank pulverized coal and 605kg of quicklime can obtain 356kg of acetylene, 64kg of hydrogen, 172kg of methane, 31kg of carbon dioxide and 302kg of carbon monoxide. The resulting acetylene, hy...

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Abstract

The invention discloses a system for preparing aromatics from pulverized coal with the function of reusing heavy aromatics, which is characterized in that it includes a fast pyrolysis device, a purification and separation device, a mixing tank, a mixing tank, a filter, a pressure ball device, Calcium carbide furnace, acetylene generator, acetylene to aromatics reactor and separation system. The invention also discloses a method for preparing light aromatics from pulverized coal. Using the above system and method, aromatics are produced from coal, which solves the problem of limited aromatics production due to limited petroleum resources, and realizes the cleanliness of low-rank coal. Efficient utilization, the acetylene-to-aromatics unit couples thermal reaction and catalytic reaction, which increases the yield of light aromatics. At the same time, the by-produced heavy aromatics can be used as a diluent for rapid pyrolysis of coal tar to remove a large amount of dust contained in it, which is beneficial to coal. Deep processing of tar.

Description

technical field [0001] The present invention relates to a combined process for preparing light aromatics from medium and low rank pulverized coal, more specifically, it relates to a kind of medium and low rank pulverized coal which passes through a fast pyrolysis device and is mixed with quicklime to produce calcium carbide, which is used to produce acetylene, and then Systems and methods for producing light aromatics from acetylene. 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 hu...

Claims

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Application Information

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IPC IPC(8): C10B53/04C10B57/18C10B57/00C10H19/00C10H21/00C07C2/48C07C15/02C01B32/942C01B32/40
CPCC10B53/04C07C2/48C10B57/005C10B57/18C10H19/00C10H21/00
Inventor 许梅梅闫琛洋于家琳史雪君吴道洪
Owner BEIJING HUAFU ENG
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