Process for reducing iron and generating carbon nanotubes by reforming methane and carbon dioxide

A carbon dioxide, carbon nanotube technology, applied in the direction of carbon nanotubes, nanocarbons, carbon compounds, etc., can solve the problem of not being used to prepare carbon nanotubes, and achieve the effect of ensuring purity, improving efficiency, and rational utilization of resources

Active Publication Date: 2020-06-26
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this patent writes about the carbon dioxide reforming process of methane, it is not used to prepare carbon nanotubes

Method used

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  • Process for reducing iron and generating carbon nanotubes by reforming methane and carbon dioxide

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Experimental program
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Effect test

Embodiment 1

[0026] In the first step, a certain mass fraction of crushed iron ore and reduced iron particles are respectively placed in two connected but separated cavities of the rotary furnace, and nitrogen gas is continuously fed into the entire reactor for a certain period of time before the second step .

[0027] The second step is to start the heating device at the reduced iron cavity, heat the system where the reduced iron is located to a certain temperature, feed methane and carbon dioxide gas with a certain space velocity and ratio into the cavity, and start the rotary furnace reactor to make it Rotating at a certain speed, the gas stays in the cavity for a certain time.

[0028] The third step is to start the heating device at the iron ore cavity, heat the system where the iron ore is located to a certain temperature, open the valve on the partition, and pass the carbon monoxide and hydrogen gas obtained in the second step reaction into the cavity where the iron ore is located. ...

Embodiment 2

[0038] Same as embodiment 1 step, each parameter is changed into:

[0039] The particle size of iron ore and reduced iron particles described in the first step is 1mm, and the mass fraction of reduced iron is 50 parts;

[0040] In the second step, the final heating temperature is 900°C, the gas ratio of methane and carbon dioxide is 1:0.5, and the gas space velocity is 2000h -1 , the rotating speed of the rotary furnace is 5r / min, and the gas stays in the cavity for 5h;

[0041] In the third step, the final heating temperature is 800°C, the ratio of carbon monoxide to hydrogen is the ratio of gas in the purified tail gas, and the gas space velocity is 3000h -1 , the residence time in the cavity is 5h;

[0042] The proportion of reduced iron refluxed in the fourth step is 25wt%.

Embodiment 3

[0044] Same as embodiment 1 step, each parameter is changed into:

[0045] The particle size of iron ore and reduced iron particles described in the first step is 10mm, and the mass fraction of reduced iron is 100 parts;

[0046] In the second step, the final heating temperature is 1000°C, the ratio of methane to carbon dioxide gas is 1:1, and the gas space velocity is 3000h -1 , the rotating speed of the rotary furnace is 10r / min, and the residence time of the gas in the cavity is 10h;

[0047] In the third step, the final heating temperature is 900°C, the ratio of carbon monoxide to hydrogen is 1:1, and the gas space velocity is 5000h -1 , the residence time in the cavity is 10h;

[0048] The proportion of reduced iron refluxed in the fourth step is 50wt%.

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Abstract

The invention discloses a process for reducing iron and generating carbon nanotubes by reforming methane and carbon dioxide, and belongs to the technical field of processes of iron catalytic methane and carbon dioxide reforming and iron reducing through synthesis gas. A purpose of the invention is to provide a process for reducing iron ore and generating carbon nanotubes by reforming methane and carbon dioxide. According to the invention, pure methane and carbon dioxide are directly used for reforming so as to ensure the purity of reactants, and synthesis gas of carbon monoxide and hydrogen isobtained after reforming, so that the reforming efficiency is improved; synthesis gas mainly comprises carbon monoxide and hydrogen and can be used for reducing iron ore, and the obtained carbon dioxide enters a reforming reaction process to be utilized; And in the reforming process, a large amount of deposited carbon is generated inevitably, and the deposited carbon can be changed into carbon nanotubes under certain conditions, so that the byproduct of carbon dioxide is the carbon nanotubes, and the product carbon nano tube with strong economic benefit enables the resource to be utilized reasonably.

Description

technical field [0001] The invention belongs to the technological field of iron-catalyzed methane carbon dioxide reforming and synthesis gas reducing iron, and specifically relates to a process for methane carbon dioxide reforming to reduce iron and generate carbon nanotubes. Background technique [0002] Carbon nanotubes are widely used because of their unique one-dimensional structure in terms of mechanics, electricity, heat, and adsorption. However, the high price of carbon nanotubes severely limits their large-scale application market. Iron is a good catalyst for the formation of carbon nanotubes and the carbon dioxide reforming of methane. The carbon monoxide and hydrogen generated after the carbon dioxide reforming of methane are synthesis gas, which in turn can reduce iron ore. [0003] CN103898265A discloses a system device and method for upgrading coke oven gas and directly reducing iron ore. The invention proposes a new process, which utilizes methane component con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/40C01B32/162C01B32/17
CPCC01B3/40C01B32/162C01B32/17C01B2203/0238C01B2203/06C01B2203/1047C01B2203/1241Y02P10/143
Inventor 王影范红霞朱沛宇刘俊吕学枚张天开罗云焕
Owner TAIYUAN UNIV OF TECH
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