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Preparation method for microspherical nano CaO-based CO2 adsorber for circulating fluidized bed, product and application

A circulating fluidized bed and adsorbent technology, applied in chemical instruments and methods, through adsorption, separation methods, etc., can solve the problems of easy attenuation of adsorption capacity, easy wear of adsorbent, and unsolved adsorption capacity, etc., to achieve excellent mass transfer , Lower adsorption reaction temperature, excellent adsorption performance

Active Publication Date: 2012-09-19
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Natural limestone and dolomite with calcium oxide as the active component are considered to be dry capture adsorbents with great development potential, but there are two major defects: the adsorption capacity is easy to decay and the adsorbent is easy to wear
Due to the formation of calcium aluminate during the calcination process, the wear resistance of calcium oxide is improved, but this adsorbent does not solve the problem of low adsorption capacity, and the adsorption capacity is less than 2mol / kg
[0015] Tang Qi mentioned in the master's degree thesis (Zhejiang University, 2011) that ammonium aluminum carbonate, polyethylene glycol, cetyltrimethylammonium bromide and activated carbon were used as pore-enlarging agents in the preparation of composite catalysts, but there was no Used in the preparation of CaO-based carbon dioxide adsorbent
Other studies on carbon dioxide capture using nano-calcium oxide-based adsorbents in circulating fluidized beds have not been reported

Method used

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  • Preparation method for microspherical nano CaO-based CO2 adsorber for circulating fluidized bed, product and application
  • Preparation method for microspherical nano CaO-based CO2 adsorber for circulating fluidized bed, product and application
  • Preparation method for microspherical nano CaO-based CO2 adsorber for circulating fluidized bed, product and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Example 1 Microsphere Nano CaO-based CO 2 Sorbent preparation

[0053] nanoCaCO 3 10g is dispersed in 50ml distilled water to form a uniformly dispersed suspension, and the nano-CaCO 3 51g of aluminum sol with a mass fraction of 20% and 1.5g of ammonium aluminum carbonate were added to the suspension, and mixed thoroughly to form a uniform slurry. The slurry was spray granulated to obtain solid adsorbent particles with a particle size of 20 microns. The adsorbent particles were calcined at 880 °C for 1 h to obtain microsphere nano-CaO-based CO 2 Adsorbent, sorb-2.

[0054] The microsphere nano-CaO base CO prepared in this embodiment 2 The sorbent particle attrition rate was 4.0%.

Embodiment 2

[0055] Example 2 Microsphere Nano CaO-based CO 2 Sorbent preparation

[0056] nanoCaCO 3 20g is dispersed in 160ml distilled water to form a uniformly dispersed suspension, and the nano-CaCO 3 8.16g of aluminum sol with a mass fraction of 5% and 4g of polyethylene glycol were added to the suspension, and mixed thoroughly to form a uniform slurry. The slurry is sprayed and granulated to obtain solid adsorbent particles with a particle size of 200 microns. The adsorbent particles were calcined at 1000 °C for 4 h to obtain microsphere nano-CaO-based CO 2 Adsorbent, sorb-3.

[0057] The microsphere nano-CaO base CO prepared in this embodiment 2 The sorbent particle attrition rate was 3.3%.

Embodiment 3

[0058] Example 3 Microsphere Nano CaO-based CO 2 Sorbent preparation

[0059] nanoCaCO 3 20g is dispersed in 100ml distilled water to form a uniformly dispersed suspension, and the nano-CaCO 3 20.4 g of aluminum sol with a mass fraction of 10% and 0.1 g of polyethylene glycol 2000 were added to the suspension, and mixed thoroughly to form a uniform slurry. The slurry was sprayed and granulated to obtain solid adsorbent particles with a particle size of 60 microns. The adsorbent particles were calcined at 850 °C for 2 h to obtain microsphere nano-CaO-based CO 2 Adsorbent, sorb-4.

[0060] The microsphere nano-CaO base CO prepared in this embodiment 2 The sorbent particle attrition rate was 5.0%.

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Abstract

The invention discloses a preparation method for a microspherical nano CaO-based CO2 adsorber for a circulating fluidized bed. The preparation method comprises the following steps: dispersing nano CaCO3 in water to obtain suspension; stirring and mixing the suspension, additives and aluminum sol uniformly; performing spray granulation to obtain microspherical granules with the grain size of 20-200 micrometers; and calcining to obtain the microspherical nano CaO-based CO2 adsorber. The invention also discloses the microspherical nano CaO-based CO2 adsorber prepared by the method, and a method for capturing CO2 by using the microspherical nano CaO-based CO2 adsorber. The method is simple and feasible; the prepared adsorber has high adsorption speed, high adsorption capacity, high adsorption property and high wear resistance, the continuous decarbonization-regeneration circulating process can be realized in a circulating fluidized bed system, the capacity and efficiency of treating CO2 are greatly improved and the cost of removing the CO2 is reduced.

Description

technical field [0001] The invention relates to the fields of material manufacturing, environmental protection, and chemical process removal of carbon dioxide, in particular to a microsphere nano-CaO-based CO2 used in a circulating fluidized bed 2 Preparation methods, products and applications of adsorbents. Background technique [0002] CO 2 The content in the atmosphere has risen from 280ppm before the industrial revolution to about 400ppm now, and it is the main cause of global warming. CO 2 The main source of emissions is the combustion process of fossil fuels, which currently reduces CO 2 The measure of emissions is the CO produced after the combustion of fossil fuels 2 Capture, store and utilize, so as to achieve the purpose of effective emission reduction. [0003] Today's commercialized more mature CO 2 The capture method is wet capture, using amine solution as the absorption liquid to absorb CO in the flue gas 2 , but this method also has several obvious disa...

Claims

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Application Information

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IPC IPC(8): B01J20/04B01J20/30B01D53/12
CPCY02C10/08Y02C20/40
Inventor 吴素芳史余耀吴嵘薛孝宠王燕王樟茂
Owner ZHEJIANG UNIV
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