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High-temperature calcium-based coal ash absorbent for CO2 and preparation method of high-temperature calcium-based coal ash absorbent

A technology of fly ash and absorbent, which is applied in the field of CO2 separation and capture, can solve problems such as the decline of absorption performance, and achieve the effects of improving stability, reducing costs, and high CO2 absorption performance

Inactive Publication Date: 2012-12-12
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Limestone and dolomite are the most commonly used calcium-based materials. However, during the carbonation and calcination cycles, the CO 2 Significantly reduced absorbency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] a CO 2 The high-temperature calcium-based fly ash absorbent is composed of calcium oxide and fly ash, the mass percentage of calcium oxide in the absorbent is 50%, and the fly ash is 50%.

[0027] The CO 2 The preparation method of high-temperature calcium-based fly ash absorbent, the steps are as follows:

[0028] 1) Pass the fly ash through a 150 μm standard sieve, soak the collected fly ash in deionized water for 2 hours, wash with deionized water for 4 times after suction filtration, and dry at 80°C for use;

[0029] 2) Calcining calcium oxide at 850°C for 3 hours to ensure that the calcium-based material is completely calcined;

[0030] 3) Weigh the calcined calcium oxide and the dried fly ash according to the mass ratio and mix them evenly, slowly add the mixed solution of water and 2-propanol under stirring condition, and the water and 2-propanol in the mixed solution The volume ratio is 3:1, hydration reaction at 85°C for 2 hours, and then evaporated and dried ...

Embodiment 2

[0034] a CO 2 The high-temperature calcium-based fly ash absorbent is composed of calcium oxide and fly ash, the mass percentage of calcium oxide in the absorbent is 75%, and the fly ash is 25%. The CO 2 The preparation method of the high-temperature calcium-based fly ash absorbent is the same as in Example 1.

[0035] Experiments show that: in the high temperature range of 400-650 ℃, the CO of the absorbent 2 The absorption capacity reached 256mg / g; when the cycle reaction was carried out 14 times, its CO 2 The decline trend of absorption capacity began to stabilize, and there was no continuous downward trend in the follow-up, and the sintering of absorbent particles was significantly improved after multiple cycles.

Embodiment 3

[0037] a CO 2 The high-temperature calcium-based fly ash absorbent is composed of calcium hydroxide and fly ash, the mass percentage of calcium hydroxide in the absorbent is 50%, and the fly ash is 50%. The CO 2 The preparation method of the high-temperature calcium-based fly ash absorbent is the same as in Example 1.

[0038] Experiments show that: in the high temperature range of 400-650 ℃, the CO of the absorbent 2 The absorption capacity reached 222mg / g; when the cycle reaction was carried out 17 times, its CO 2 The decline trend of absorption capacity began to stabilize, and there was no continuous decline trend afterwards; the sintering of absorbent particles was improved.

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PUM

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Abstract

A high-temperature calcium-based coal ash absorbent for CO2 comprises calcium-based materials and coal ash, wherein the calcium-based materials refer to calcium oxide, calcium hydroxide, calcium carbonate, calcium acetate, limestone minerals or dolomite minerals, and the mass percent of the calcium-based materials in the absorbent is 45-85%. A preparation method of the high-temperature calcium-based coal ash absorbent for the CO2 includes that the high-temperature calcium-based coal ash absorbent for the CO2 is prepared from the calcium-based materials and the coal ash by calcination reaction and hydration reaction. The high-temperature calcium-based coal ash absorbent for the CO2 and the preparation method have the advantages that the absorbent has high CO2 absorbing capacity and is recyclable, capable of effectively reducing abrasion during use, anti-sintering and capable of effectively relieving agglomeration among absorbent particles and collapse of surface appearance and pore structures after multiple cycles; and the preparation method is simple, feasible and low in cost. Besides, the absorbent is capable of absorbing the CO2 at the high temperature, low in separation and capture cost, wide in sources of the calcium-based materials and capable of effectively using the coal ash produced by power plants, thereby conforming to the current cyclic economy thought and the cleaning production idea.

Description

technical field [0001] The invention relates to CO in the flue gas of a coal-fired power plant 2 Separation capture technology, especially a CO 2 A high-temperature calcium-based fly ash absorbent and a preparation method thereof. Background technique [0002] my country is one of the few countries in the world that uses coal as the main primary energy source. Statistics show that in 2007, coal accounted for 28.6% of the average global primary energy consumption; while coal accounted for 70.4% in my country. Compared with energy sources such as coal and oil and natural gas, the CO caused by the production unit of heat 2 Emissions are about 36% and 61% higher than oil and gas, respectively. Due to the composition and consumption characteristics of resources and energy, my country is facing enormous pressure in reducing greenhouse gas emissions. [0003] Coal-fired power plants are an important, long-term, stable CO 2 Stationary emission sources have a very large impact ...

Claims

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Application Information

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IPC IPC(8): C04B35/057C04B35/622B01D53/14
CPCY02C10/06Y02C20/40
Inventor 于宏兵杨磊
Owner NANKAI UNIV