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Preparation and usage methods of high-temperature CO2 modified calcium-based adsorbent

A calcium-based adsorbent and CO2 technology, which is applied in the field of preparation of high-temperature CO2-modified calcium-based adsorbents, can solve the problems of easy sintering of adsorbents and clogging of adsorbent micropores, so as to achieve large-scale industrial application and avoid sintering , the effect of good cycle stability

Inactive Publication Date: 2017-08-11
CHINA UNIV OF MINING & TECH
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a low-carbon, environmentally friendly, simple process, cheap and easy-to-obtain method for preparing modified calcium-based CO2 adsorbents by using oil sand pyrolysis residues, so as to solve the problem of CaCO generated during the adsorption process of calcium-based adsorbents. 3 It is easy to cause the clogging of the micropores of the adsorbent and the problem of sintering during the regeneration of the adsorbent

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  • Preparation and usage methods of high-temperature CO2 modified calcium-based adsorbent
  • Preparation and usage methods of high-temperature CO2 modified calcium-based adsorbent

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preparation example Construction

[0035] The preparation method: using oil sand pyrolysis residue as calcium source, compounding kaolinite, high-temperature calcination, heating hydration modification and molding with ethanol solution to obtain a large specific surface area and pore structure, and can be more Secondary high temperature CO 2 Calcium based sorbent.

[0036] Specific steps are as follows:

[0037] (1) Preparation of oil sand pyrolysis residue to remove high temperature CO 2 The preparation method of the modified calcium-based adsorbent comprises the following steps:

[0038] ① Blending and preparation of adsorbent raw materials: oil sand pyrolysis residue and kaolinite are added to the grinder at a mass ratio of 6:1 to 8:1 for grinding and blending to obtain a mixture powder with a particle size of less than 0.5mm ;

[0039] ② Calcination of adsorbent raw materials: spread the mixed powder obtained in ①, and fully calcined by temperature programming to obtain calcium-based adsorbent materials...

Embodiment 1

[0055] Example 1: Preparation of high temperature CO from oil sand pyrolysis residue 2 The method for modifying the calcium-based adsorbent, the specific operations are as follows:

[0056] (1) According to the mass ratio of 7:1, the oil sand pyrolysis residue and kaolinite are mixed and added to the grinder for grinding and blending to obtain a mixture powder with a particle size of less than 0.5 mm.

[0057] (2) Raise the temperature to 450°C at a heating rate of 15°C / min, and keep at this temperature for 30 minutes, continue to heat up to 800°C, and fully calcined at this temperature for 1 hour to obtain calcium-based raw materials;

[0058] (3) Weigh the calcium-based raw material obtained in step (1) and mix it with 65% ethanol solution, then heat and hydrate at 40°C; the mass ratio of the calcium-based raw material to the ethanol solution is 1:1, and the hydration reaction time is 6h ;

[0059] (4) Apply the modified calcium-based adsorbent to high temperature CO 2 Cy...

Embodiment 2

[0060] Example 2: Preparation of high temperature CO from oil sand pyrolysis residue 2 The method for modifying the calcium-based adsorbent, the specific operations are as follows:

[0061] (1) According to the mass ratio of 8:1, the oil sand pyrolysis residue and kaolinite are mixed and added to the grinder for grinding and blending to obtain a mixture powder with a particle size of less than 0.5 mm.

[0062] (2) Raise the temperature to 500°C at a heating rate of 15°C / min, and keep at this temperature for 20 minutes, continue to heat up to 700°C, and fully calcined at this temperature for 1.5 hours to obtain calcium-based raw materials;

[0063] (3) Weigh the calcium-based raw material obtained in step (1) and mix it with 65% ethanol solution, then heat and hydrate at 50°C; the mass ratio of the calcium-based raw material to the ethanol solution is 1:1, and the hydration reaction time is 4h ;

[0064] (4) Apply the modified calcium-based adsorbent to high temperature CO 2...

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Abstract

The invention discloses preparation and usage methods of a high-temperature CO2 modified calcium-based adsorbent and a preparation method of a calcium-based CO2 adsorbent. Oil sand pyrolysis residues are selected as a main calcium source and is modified through the processes such as oil sand pyrolysis residue and kaolinite mixing and compounding, high-temperature calcination and ethanol solution hardening and tempering for forming to obtain a modified calcium-based CO2 adsorbent; the modified calcium-based CO2 adsorbent is large in adsorption capacity and has the good effect of removing CO2 in high-temperature flue gas of a thermal power plant and high cyclic adsorption stability, and the high-temperature CO2 adsorption removal rate after 25 times of cyclic regeneration is still kept to 65% or above. The preparation method has the advantages that the calcium source is the oil sand pyrolysis residues, and the preparation process is simple, quick and convenient to operate, low in cost and friendly to the environment and is used for adsorption and separation of high-temperature gas CO2; the CO2 in the flue gas can be directly adsorbed, and the advance influence of carbon emission on the environment and climate is reduced; the purpose of using waste to treat waste can be achieved, the methods conform to low-carbon green economy, and the effect is obviously improved compared with other calcium-based CO2 adsorbents.

Description

technical field [0001] The present invention relates to a kind of preparation method of calcium-based CO2 adsorbent, especially a kind of high temperature CO 2 Preparation and use of modified calcium-based adsorbent. Background technique [0002] The greenhouse effect has caused a huge threat to the human living environment, and the culprit of the greenhouse effect is CO 2 , according to the calculation of the CO emitted into the atmosphere by human activities every year 2 About 60 billion tons, of which fossil fuel thermal power plants CO 2 Emissions account for about 1 / 3 of total man-made emissions, control and recovery of CO emitted by thermal power plants 2 It is an important way to solve the problem of greenhouse effect. CO emissions from thermal power plants 2 The temperature is high, and high temperature adsorption and separation can improve the utilization rate of heat energy and reduce energy consumption. Therefore, modified calcium-based adsorbents are used to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/12B01J20/30B01D53/02
CPCB01D53/02B01D2257/504B01D2259/4009B01J20/04B01J20/12Y02C20/40
Inventor 苗真勇孟献梁褚睿智宋凯旋万永周吴国光
Owner CHINA UNIV OF MINING & TECH
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