Process and system for preparing ethylene from powdered coal by 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 high carbon emission, long technical process, complex process, etc., to achieve the effect of less floor space, improved economic benefits, and reduced environmental pollution

Active Publication Date: 2015-10-21
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 emi...

Method used

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  • Process and system for preparing ethylene from powdered coal by two-stage calcium carbide furnace
  • Process and system for preparing ethylene from powdered coal by two-stage calcium carbide furnace

Examples

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Effect test

Embodiment 1

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

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

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

[0052] Wherein,...

Embodiment 2

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

[0068] Wherein, the two-stage calcium carbide production unit is a two-stage calcium carbide furnace, the two-stage calcium carbide furnace includes an upper pyrolysis furnace cavity and a lower smelting furnace cavity that are connected, and a heating device is provided in the lower smelting furnace cavity;

[0069] The gas outlet of the two-stage calcium carbide production unit is connected with the gas inlet pipe of the CO shifting and decarbonization hydrogen production unit, and the calcium carbide outlet of the two-stage calcium carbide production unit is connected with the inlet pipe of the acetylene gener...

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Abstract

The invention relates to a process and a system for preparing ethylene from powdered coal by a two-stage calcium carbide furnace. The process includes (1) two-stage calcium carbide furnace production; (2) carbon monoxide transformation and decarburization for hydrogen production; (3) acetylene generation; (4) acetylene hydrogenation reaction; and (5) cryogenic separation. According to the invention, the upper and lower two-stage calcium carbide furnace is adopted, the pyrolysis process and the calcium carbide production process are combined, the continuous calcium carbide production process and the effective utilization of heat energy are realized, so that the energy consumption of calcium carbide production is effectively reduced; and middle and low order pulverized coal with low costs is adopted as carbon materials, the costs are reduce, the raw material surface area is increased, the reactivity is increased, the calcium carbide smelting temperature is reduced, and the energy consumption is effectively reduced. Tar and pyrolysis gas by-products with high added values are obtained in the pyrolysis process, so that the overall economy of the process is improved, and in addition, the process adopts a liquid solvent to absorb acetylene, avoids the acetylene polymerization explosion hazard, and realizes high pressure reaction, so as to improve 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 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. 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. The demand is greater than the production capacity, which is important for oil reserves. my country, which is not rich, poses a serious strategic threat. Therefore, seeking another new source and process to prepare 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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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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