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Oxygen carrier for smokeless combustion technology and preparation method thereof

A technology of smokeless combustion and oxygen carrier, which is applied in the direction of fuel, fuel additives, petroleum industry, etc. It can solve the problems of undiscovered oxygen storage capacity and good cycle performance, and achieve strong anti-sintering ability, good cycle performance, and no secondary pollution effect

Inactive Publication Date: 2010-11-10
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The key to the industrialization of this technology is that an oxygen carrier with a large oxygen storage capacity and good cycle performance has not yet been found.

Method used

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  • Oxygen carrier for smokeless combustion technology and preparation method thereof
  • Oxygen carrier for smokeless combustion technology and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Prepare Ce and Fe nitrates with a molar ratio of 5:5 into a solution with a total concentration of 0.2mol / L, and then add an appropriate amount of H 2 o 2 , mix evenly. The mixed solution was dropped into 5mol / L ammonia water at a speed of 3ml / min to obtain a precipitate. Continue to stir for 30 min after the precipitation is complete. After aging for 60 minutes, the resulting slurry was moved into a high-pressure reactor (filling degree: 65%), and kept at 200° C. for 48 hours. The obtained product is washed with water, washed with alcohol and dried to obtain a cerium-iron composite oxygen carrier. The oxidation degree X of the prepared oxygen carrier can be recovered from 0.15 to above 0.90, indicating that the lattice oxygen of the oxygen carrier can be restored to more than 90%. It took 42 hours for the oxygen carrier to complete 60 cycle reactions at 800°C, and the methane conversion rate reached 78%. % above, reflects a higher reaction performance.

Embodiment 2

[0023] The nitrates of Ce and Fe were respectively prepared into salt solutions with a concentration of 0.25mol / L, and then an appropriate amount of H 2 o 2 , mix evenly. The mixed solution was dropped into 6M ammonia water at a speed of 5 ml / min to obtain a precipitate. Continue stirring for 60 min after the precipitation is complete. After aging for 60 minutes, the resulting slurry was moved into a high-pressure reactor (filling degree: 65%), and kept at 220° C. for 48 hours. The resulting product was washed with water, washed with alcohol, and dried to obtain pure CeO 2 and Fe 2 o 3 powder. According to the molar ratio of Ce and Fe is 5:5, the CeO 2 and Fe 2 o 3 Mix evenly, and after high-speed ball milling for 30 minutes, a cerium-iron composite oxygen carrier is obtained. The oxidation degree X of the prepared oxygen carrier can be recovered from 0.12 to above 0.92, indicating that the lattice oxygen of the oxygen carrier can be restored to more than 92%. It too...

Embodiment 3

[0025] Prepare Ce, Fe, Zr nitrate with a molar ratio of 0.5:0.35:0.15 into a solution with a total concentration of 0.25mol / L, and then add an appropriate amount of H 2 o 2 , mix evenly. The mixed solution was dropped into 5M ammonia water at a speed of 5 ml / min to obtain a precipitate. Continue stirring for 60 min after the precipitation is complete. After aging for 90 minutes, the resulting slurry was moved into a high-pressure reactor (filling degree: 60%), and kept at 220° C. for 48 hours. The obtained product is washed with water, washed with alcohol and dried to obtain a cerium-iron-zirconium composite oxygen carrier. The oxidation degree X of the prepared oxygen carrier can be recovered from 0.10 to above 0.95, indicating that the lattice oxygen of the oxygen carrier can be restored to more than 95%. It took 35 hours for the oxygen carrier to complete 55 cycle reactions at 850°C, and the methane conversion rate reached 90. % above, reflects a higher reaction perform...

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Abstract

The invention discloses an oxygen carrier for smokeless combustion technology and a preparation method thereof. The oxygen carrier is prepared by combining cerium-based composite oxygen carrier materials of Fe2O3 and ZrO3 by a cosediment water-hot synthesis method and a mechanical mixing method and is used for the transmission of oxygen needed in smokeless combustion, wherein Fe2O3 has a low cost; low valent Fe3+ is introduced in CeO2 lattices to not only obviously improve the oxygen storage performance of CeO2, but also improve the surface state of the CeO2 and promote the formation of oxygen adsorption sites due to the existence of iron species; and Zr4 with a smaller radius is adulterated to the CeO2 lattices to effectively improve the stability and anti-sintering capability of the CeO2. Therefore, by using the cerium-based material modified by Fe and Zr as the oxygen carrier of the smokeless combustion, the oxygen storage capability and cycle performance of the oxygen carrier can be improved, the cost can be obviously reduced and the efficiency of fuel combustion can be improved.

Description

technical field [0001] The invention relates to the field of efficient utilization of energy, in particular to an oxygen carrier used in smokeless combustion technology and a preparation method thereof. Background technique [0002] Smokeless combustion is a new type of fossil fuel combustion technology, which divides the combustion of fuel and combustion air into two processes: oxidant generation and fuel combustion, and the two processes are carried out in two reactors respectively. The first part of this combustion technology is the oxidizer generation chamber. This step is carried out in the first reactor, which is filled with molten salt, and low-valence oxides or other oxygen-carrying media are dispersed in the molten salt, and the air is blown into the molten pool by an air compressor or fan. When oxygen comes into contact with low-valence oxides, it reacts with oxides to generate higher-valence oxides. Molecular oxygen in the air is absorbed in the system in the for...

Claims

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Application Information

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IPC IPC(8): C10L10/00
Inventor 李孔斋王华魏永刚祝星宴冬霞
Owner KUNMING UNIV OF SCI & TECH
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