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 uneven temperature distribution, unfavorable system stable operation, accelerated oxygen carrier breakage and sintering, etc., and achieves easy control. , good heat storage and oxygen carrying capacity, the effect of improving mechanical strength

Inactive Publication Date: 2013-02-13
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 a

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0026] Example 1

[0027] (1) Grind Na with a ball mill 2 CO 3 Nano-sized microspheres up to 300nm;

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

[0029] (3) The suspension obtained in step (2) is slowly added dropwise to TBOT (butyl titanate) in parallel flow with ammonia under stirring conditions until the pH value of the suspension = 9;

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

[0031] (5) Add the solution prepared in step (4) to the suspension obtained in step (3) in a volume ratio of 1:1 under th...

Example Embodiment

[0034] Example 2

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

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

[0037] (3) The suspension obtained in step (2) is slowly added dropwise to TBOT (butyl titanate) in parallel flow with ammonia under stirring conditions until the pH value of the suspension = 10;

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

[0039] (5) Add the solution prepared in step (4) to the suspension obtained in step (3) in a volu...

Example Embodiment

[0042] Example 3

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

[0044] (2) Disperse the nanospheres of step (1) at 10g / mL in a mixture of CTAB (hexadecyltrimethylammonium bromide) and ethanol to form a suspension, and then place the suspension under ultrasonic conditions. Under stirring, make the nano-microspheres uniformly dispersed in the solution; wherein the mixture 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) The suspension obtained in step (2) is slowly added dropwise to TBOT (butyl titanate) in parallel flow with ammonia under stirring conditions until the pH value of the suspension = 11;

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

[0047] (5) Add the solution prepared in step (4) to the suspension obtained in step (3) in a volume...

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PUM

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Abstract

The invention provides a thermal storage oxygen carrier of a core-shell structure and a preparation method thereof. The oxygen carrier is of a double-shell structure, namely a high-temperature phase change heat storage material. An inner shell is TiO2, and an outer shell is made of an oxygen carrier material. The method includes that the high-temperature phase change heat storage material is ground to nanoscale microballoons and dispersed in a mixed liquor of cetyl trimethyl ammonium bromide (CTAB) and ethanol to form turbid liquid, the turbid liquid and ammonia water parallelly flow and are dropped into tetra-n-butyl titanate (TBOT) slowly, a nitrate and aluminum nitrate solution is dropped into the turbid liquid gradually, stirring is conducted continuously in a dropping process, and sediment is generated; and then centrifugal processing is conducted, the sediment is washed through absolute ethyl alcohol and deionized water, the sediment is dried and baked, and the thermal storage oxygen carrier is obtained. The structure is favorable for protecting and fixing an inner-core thermal storage material becoming liquid at high temperature. Simultaneously, a frit reaction is prevented from happening between the inner-core thermal storage material and the outermost-layer oxygen carrier material, and the mechanical strength of the oxygen carrier is improved. 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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IPC IPC(8): C10L10/00B01J13/02
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
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