Method and system for preparing ethylene from powdered coal

A pulverized coal and ethylene technology, applied in the field of coal chemical industry, can solve problems such as long technical process, high carbon emissions, complex process, etc., and achieve the effects of improving economy, reducing process energy consumption, and reducing environmental pollution

Active Publication Date: 2015-09-30
SHENWU TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this process has a long technical process, complex process, large investment, high carbon emissions, especially the large demand for water, which makes it impossible to carry out in water-scarce areas.

Method used

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  • Method and system for preparing ethylene from powdered coal
  • Method and system for preparing ethylene from powdered coal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] A method for producing ethylene by using bituminous coal as a raw material using a rotary bottom calcium carbide furnace, such as figure 1 As shown, the specific steps are as follows:

[0049] (1) Pyrolysis upgrading and smelting to produce calcium carbide

[0050] Pretreatment: Finely grind the bituminous coal and quicklime with a particle size of less than 1mm by jet mill, respectively, to obtain bituminous coal powder and quicklime powder with a particle size of less than 30 microns accounting for more than 98.19%, and then according to the fixed carbon and calcium oxide Prepare the mixture with a molar ratio of 2.8:1 and send it to the mill by airflow, add 8wt% binder tar and mill for 10 minutes to obtain the mixed material, and obtain material balls with a particle size of 8 to 30mm through a disc granulator group;

[0051] Pyrolysis: The material pellets are directly transferred by the belt to the feed bin on the roof of the rotary bottom calcium carbide furnace...

Embodiment 2

[0068] A system for realizing the method for producing ethylene from pulverized coal described in Embodiment 1, such as figure 2 As shown, it includes pyrolysis upgrading and smelting calcium carbide unit, pressure swing adsorption hydrogen extraction unit, CO shift decarbonization hydrogen production unit, acetylene generation unit, and acetylene hydrogenation reaction unit;

[0069] Wherein, the pyrolysis upgrading and smelting calcium carbide production unit is a rotary bottom calcium carbide furnace, which includes a pyrolysis furnace cavity, a smelting furnace cavity directly connected with the pyrolysis furnace cavity, and a plurality of radiant tube burners; wherein, the A plurality of the radiant tube burners are arranged on the inner wall of the outer peripheral wall of the pyrolysis furnace cavity and above the revolving bottom calcium carbide furnace charge plate;

[0070]The coal gas outlet of the pyrolysis furnace chamber is connected to the inlet pipeline of the...

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Abstract

The invention relates to a method and system for preparing ethylene from the raw material of powdered coal. The method includes the steps of pyrolysis upgrading and smelting production of calcium carbide, pressure-swing adsorption hydrogen extraction, CO conversion, decarburization hydrogen production, acetylene generation, acetylene hydrogenation reaction and cryogenic separation. The method has the advantages that technical energy consumption is lowered, hydrogen sources are broadened and by-products are recycled, environmental pollution is easily reduced, the ethylene production cost is lowered, the economic benefits are greatly increased, and the method can be better applied to large-scale industrial production.

Description

technical field [0001] The invention relates to a method and system for preparing ethylene from pulverized coal, and belongs to the technical field of coal chemical industry. Background technique [0002] Ethylene is a major raw material in the petrochemical industry. The current preparation process is mainly the cracking of naphtha to olefins and coal to olefins. In 2015, the total domestic ethylene production capacity will reach about 22 million t / a, and in 2020, the domestic ethylene production capacity will further increase to 32.5 million t / a. It is estimated that the domestic ethylene consumption will be 48 million tons by 2020, and the demand is greater than the production capacity. For our country, which is not rich, it has formed a serious strategic threat. Therefore, seeking another new source and process method to prepare the bulk basic organic chemical raw material-ethylene, and replacing petroleum as a raw material in the field of industrial production can larg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/04C07C5/09C01F11/18B82Y40/00C10B53/04
CPCY02P20/52
Inventor 车中山史雪君余海鹏曹志成吴道洪
Owner SHENWU TECH GRP CO LTD
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