Method and system for producing ethylene by utilizing pulverized coal

A technology for pulverized coal and ethylene, applied in the field of coal chemical industry, can solve the problems of high volatile content, poor falling strength and high moisture content, and achieve the effects of less floor space, shorter process and lower energy consumption

Active Publication Date: 2015-07-29
SHENWU TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Low-rank coal has the characteristics of low carbon content, high moisture, high volatile matter, easy pulverization, spontaneous combustion, water immersion, and poor drop strength. It is not suitable for long-distance transportation, which limits the direct utilization of low-rank coal and restricts its liquefaction and gasification. conversion and utilization such as dry distillation

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  • Method and system for producing ethylene by utilizing pulverized coal
  • Method and system for producing ethylene by utilizing pulverized coal

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Experimental program
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Effect test

Embodiment 1

[0060] See figure 2 , a system for producing ethylene from pulverized coal, including pyrolysis upgrading unit, PSA hydrogen extraction unit, smelting and production of calcium carbide unit, CO conversion decarbonization hydrogen production unit, acetylene generation unit, acetylene hydrogenation reaction unit, cryogenic separation unit and carbide slag carbonization unit;

[0061] The pyrolysis upgrading unit includes a pyrolysis device, the outlet of the pyrolysis device is connected to the calcium carbide furnace; the top of the pyrolysis device is provided with a pyrolysis gas outlet, and the pyrolysis gas outlet is connected to the A pressure swing adsorption hydrogen extraction unit; the pressure swing adsorption hydrogen extraction unit is provided with a hydrogen outlet; the pyrolysis device is provided with a fuel inlet, and the gas phase residual outlet of the pressure swing adsorption hydrogen extraction unit is connected to the fuel inlet of the pyrolysis device. ...

Embodiment 2

[0067] Adopt the system of embodiment 1, the technique of preparing ethylene with pulverized coal:

[0068] Pulverized coal is long-flame coal, which is crushed and screened to 3-5mm, and then ground to 50μm. Quicklime is crushed and screened to 3-5mm, and then ground to 50μm, and becomes powdered quicklime, pulverized coal and quicklime powder Mix according to the mass ratio of 1.06:1.

[0069] 1) Pyrolysis upgrading

[0070] Long-flame coal and quicklime powder are fully mixed and then extruded into raw material rods of 30mm*25mm*13mm. The raw material rods are sent to the pyrolysis device at 900°C. The gas phase products produced by pyrolysis include tar and pyrolysis gas; After decomposition, the solid product with a temperature of 800°C is sent to the calcium carbide furnace; the volume ratio of hydrogen in the pyrolysis gas is 42%. If quicklime powder is not added under the same process conditions, the pyrolysis gas The volume ratio of hydrogen in the coal is 30%. It c...

Embodiment 3

[0089] Adopt the system of embodiment 1, the technique of preparing ethylene with pulverized coal:

[0090] Pulverized coal is long-flame coal, which is crushed and screened to 3-5mm, and then ground to 100μm. Quicklime is crushed and screened to 3-5mm, and then ground to 100μm, and becomes powdered quicklime, pulverized coal and quicklime powder Mix according to the mass ratio of 1.16:1.

[0091] 1) Pyrolysis upgrading

[0092] Fine coal and quicklime are fully mixed and then extruded into pellets with a diameter of 30 mm. The pellets are sent to a pyrolysis device at 900 ° C. The gas phase products produced by pyrolysis include tar and pyrolysis gas; after pyrolysis, the temperature is 780 The solid product at ℃ is sent to the calcium carbide furnace; the volume ratio of hydrogen in the pyrolysis gas is 38%. The volume ratio is 30%. It can be seen that the addition of quicklime powder can significantly increase the hydrogen production rate in the coal pyrolysis process.

...

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Abstract

The invention belongs to the field of coal chemical industry and provides a method for producing ethylene by utilizing pulverized coal. The method comprises the steps of (1) pyrolysis upgrading, (2) pressure swing adsorption and hydrogen extraction, (3) smelting production of calcium carbide, (4) CO conversion decarburization and hydrogen production, (5) acetylene generation, (6) acetylene hydrogenation reaction and (7) cryogenic separation so as to obtain the ethylene and other hydrocarbon products. According to the method, high-quality resources such as blocky coke, semi-coke and anthracite which are high in price are replaced with medium-low-order raw pulverized coal which is low in price, the medium-low-order raw pulverized coal serves as a raw material for producing the calcium carbide, the process energy consumption is low, high value-added tar and pyrolysis gas byproducts are obtained in the pyrolysis process, and the overall economy of the process is improved; a pyrolyzed solid product adopts a hot delivery process, the sensible heat is fully utilized, and the power consumption of a calcium carbide furnace is reduced; hydrogen obtained by the pressure swing adsorption of a pyrolysis gas product and hydrogen obtained by the tail gas conversion of the calcium carbide furnace are used for the acetylene hydrogenation reaction, another product of the calcium carbide furnace reacts with CO2 to generate nano calcium carbonate, and the environmental pollution is reduced.

Description

technical field [0001] The invention belongs to the field of coal chemical industry, and in particular relates to a method and system for producing ethylene from pulverized coal. Background technique [0002] Ethylene is a major feedstock for the petrochemical industry, and its importance is further underpinned by its enormous demand. From 2015 to 2020, the growth rate of world ethylene production capacity will increase to about 4.1%, and the growth rate of demand will increase to 4.0%. 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 or...

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
Inventor 史雪君余海鹏车中山吴道洪
Owner SHENWU TECH GRP CO LTD
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