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Thermal storage oxygen carrier of core-shell structure and preparation method thereof

A core-shell structure and oxygen carrier technology, which is applied in the preparation of microspheres, microcapsule preparations, petroleum industry, etc., can solve the problems of unfavorable system stable operation, accelerated oxygen carrier fragmentation and sintering, uneven temperature distribution, etc., to achieve good energy storage Thermal and oxygen carrying capacity, improved mechanical strength, and easy-to-control effects

Inactive Publication Date: 2014-09-03
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, no matter in the fuel reactor or the air reactor, the oxygen carrier bed layer has uneven temperature distribution in the lateral and axial directions, especially in the air reactor due to intense heat release and hot spots.
Thermal shock caused by temperature instability and the appearance of hot spots will accelerate the fragmentation and sintering of oxygen carriers, which is not conducive to the stable operation of the system

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Grinding Na with a ball mill 2 CO 3 Nanoscale microspheres up to 300nm;

[0028] (2) Disperse the nano-microspheres in step (1) in a mixture of CTAB (cetyltrimethylammonium bromide) and ethanol at 5 g / mL to form a suspension, and the suspension is subjected to ultrasonic conditions Under stirring, the nano-microspheres are evenly dispersed in the solution; wherein, the mixed solution of CTAB and ethanol is to dissolve CTAB in absolute ethanol, so that the concentration of CTAB in the mixed solution is 0.15mol / L;

[0029] (3) Add the suspension obtained in step (2) into TBOT (butyl titanate) slowly and dropwise together with ammonia water under stirring conditions until the pH value of the suspension is 9;

[0030] (4) Dissolve ferric nitrate and aluminum nitrate in deionized water at a mass ratio of 3:2 so that the salt concentration is 0.5mol / L;

[0031] (5) Add the solution prepared in step (4) dropwise to the suspension obtained in step (3) at a volume ratio o...

Embodiment 2

[0035] (1) Use a ball mill to grind sodium chloride to nano-sized microspheres of 1-100nm;

[0036] (2) Disperse the nano-microspheres in step (1) in a mixture of CTAB (cetyltrimethylammonium bromide) and ethanol at 1g / mL to form a suspension. Under stirring, the nano-microspheres are evenly dispersed in the solution; wherein, the mixed solution of CTAB and ethanol is to dissolve CTAB in absolute ethanol, so that the concentration of CTAB in the mixed solution is 0.25mol / L;

[0037] (3) Add the suspension obtained in step (2) into TBOT (butyl titanate) slowly and dropwise together with ammonia water under stirring conditions until the pH value of the suspension is 10;

[0038] (4) Dissolve cobalt nitrate and aluminum nitrate in deionized water at a mass ratio of 3:2, so that the concentration of the salt is 1mol / L;

[0039] (5) Add the solution prepared in step (4) dropwise to the suspension obtained in step (3) at a volume ratio of 1:1 in a water bath at 70°C, and keep stirr...

Embodiment 3

[0043] (1) Use a ball mill to grind the aluminum-silicon alloy to nano-scale microspheres of 400-500nm;

[0044] (2) Disperse the nano-microspheres in step (1) in a mixture of CTAB (cetyltrimethylammonium bromide) and ethanol at 10 g / mL to form a suspension. Under stirring, the nano-microspheres are evenly dispersed in the solution; wherein, the mixed solution of CTAB and ethanol is to dissolve CTAB in absolute ethanol, so that the concentration of CTAB in the mixed solution is 0.08mol / L;

[0045] (3) Add the suspension obtained in step (2) into TBOT (butyl titanate) slowly and dropwise together with ammonia water under stirring conditions, until the pH value of the suspension is 11;

[0046] (4) Dissolve nickel nitrate and aluminum nitrate in deionized water at a mass ratio of 3:2, so that the salt concentration is 2mol / L;

[0047] (5) Add the solution prepared in step (4) dropwise to the suspension obtained in step (3) at a volume ratio of 1:1 in a water bath at 70°C, and k...

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PUM

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Abstract

The invention provides a core-shell structure heat storage type oxygen carrier and a preparation method thereof. The oxygen carrier has a double-shell structure, that is, the core is a high-temperature phase change heat storage material, the inner shell layer is TiO2, and the outer shell layer is an oxygen carrier material. Grind the high-temperature phase change thermal storage material into nano-sized microspheres; disperse it in a mixture of CTAB and ethanol to form a suspension, add it slowly and dropwise to TBOT together with ammonia water, and add nitrate and aluminum nitrate solutions dropwise to the suspension. In the turbid liquid, stir continuously during the dropwise addition to generate a precipitate; then perform centrifugation, wash the precipitate with absolute ethanol and deionized water in sequence, dry the precipitate, and then roast to obtain a core-shell structure heat storage type oxygen carrier. This structure is conducive to protecting and fixing the core heat storage material that becomes liquid at high temperatures, while preventing the melting reaction between the core heat storage material and the outermost oxygen carrier material, and improving the mechanical strength of the oxygen carrier. The preparation method is simple and easy to control.

Description

technical field [0001] The invention relates to a heat storage type oxygen carrier with a core-shell structure and a preparation method thereof, belonging to the field of efficient and clean utilization of energy. Background technique [0002] Chemical looping combustion technology is a new type of combustion technology with distinctive characteristics of energy saving and emission reduction. It has CO 2 Internal separation properties, no need to add CO 2 The separation device can capture high-purity CO 2 gas. Chemical looping combustion utilizes the high-grade energy in the chemical looping combustion system to realize energy cascade utilization and improve energy efficiency. This method does not require a lot of energy consumption in the two processes of combustion and separation, separation and recovery of CO 2 Does not require additional energy consumption, does not reduce system efficiency, and recovers CO 2 And control of NOx has an absolute advantage. [0003] C...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J13/02C10L10/00
Inventor 李孔斋刘自松王华魏永刚祝星杜云鹏杨丽田俊杰
Owner KUNMING UNIV OF SCI & TECH