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Process and system for producing ethylene from pulverized coal in a two-stage calcium carbide furnace

A two-stage, calcium carbide furnace technology, applied in the field of coal chemical industry, can solve the problems of long technical process, high carbon emission, complex process, etc., and achieve the effects of improving economic efficiency, reducing floor space and reducing environmental pollution.

Active Publication Date: 2017-12-08
SHENWU TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Process and system for producing ethylene from pulverized coal in a two-stage calcium carbide furnace
  • Process and system for producing ethylene from pulverized coal in a two-stage calcium carbide furnace

Examples

Experimental program
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Effect test

Embodiment 1

[0049] A two-stage calcium carbide furnace pulverized coal to ethylene process, such as figure 1 shown, including the following steps:

[0050] (1) Two-stage calcium carbide production

[0051] The coal is crushed step by step to 20-100 μm, the quicklime is ground to 20-100 μm, the 20-100 μm pulverized coal, quicklime powder and binder are fully mixed, extruded and sent to the upper stage of the two-stage calcium carbide furnace for pyrolysis The furnace cavity is subjected to medium-high temperature pyrolysis, and the temperature in the upper section is 600-1000°C; the solid obtained after pyrolysis is about 800°C, and enters the lower section of the two-stage calcium carbide furnace (gas melting furnace) to produce calcium carbide and calcium carbide tail gas; the obtained calcium carbide tail gas Then enter the two-stage pyrolysis furnace and the upper part of the two-stage calcium carbide furnace to exchange heat with the formed solid raw materials;

[0052] Wherein, the...

Embodiment 2

[0067] A system for realizing the two-stage calcium carbide furnace pulverized coal-to-ethylene process described in embodiment 1, such as figure 2 As shown, it includes two-stage calcium carbide production unit, CO conversion decarbonization hydrogen production unit, acetylene generation unit, acetylene absorption unit, and acetylene hydrogenation reaction unit;

[0068] Wherein, the two-stage calcium carbide production unit is a two-stage calcium carbide furnace, and the two-stage calcium carbide furnace includes a connected upper pyrolysis furnace chamber and a lower smelting furnace chamber, and a heating device is installed in the lower smelting furnace chamber;

[0069] The gas outlet of the two-stage calcium carbide production unit is connected to the inlet pipeline of the CO conversion decarbonization hydrogen production unit, and the calcium carbide discharge port of the two-stage calcium carbide production unit is connected to the feed inlet pipeline of the acetylene...

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Abstract

The invention relates to a process and system for producing ethylene from pulverized coal in a two-stage calcium carbide furnace. The process includes: (1) two-stage calcium carbide production; (2) CO conversion and decarbonization to produce hydrogen; (3) acetylene generation; (4) acetylene hydrogenation reaction; (5) cryogenic separation. The present invention adopts an upper and lower two-stage calcium carbide furnace to organically combine the pyrolysis process with the calcium carbide production process, realizes the continuous production process of calcium carbide and the effective utilization of heat energy, thereby effectively reducing the energy consumption of calcium carbide production; As a carbon raw material, coal not only reduces the cost, but also increases the surface area of ​​the raw material, increases the reactivity, reduces the temperature of calcium carbide smelting, and effectively reduces the energy consumption of the process; at the same time, high value-added tar and pyrolysis gas are obtained during the pyrolysis process By-products improve the overall economics of the process. In addition, the invention also uses a liquid phase solvent to absorb acetylene, avoiding the danger of acetylene polymerization explosion, and realizing high-pressure reactions, thereby improving the production capacity of the device.

Description

technical field [0001] The invention relates to a process and system for producing ethylene from pulverized coal in a two-stage calcium carbide furnace, belonging 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 f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C11/04C07C5/09C07C7/04C10B53/04
Inventor 余海鹏史雪君车中山张顺利吴道洪
Owner SHENWU TECH GRP CO LTD
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