Hightemperature absorption of CO2 and breakthrough characteristics of CaO/FA sorbents

杨磊

doi:10.3969/j.issn.0438-1157.2012.02.038

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Hightemperature absorption of CO2 and breakthrough characteristics of CaO/FA sorbents

更新时间：2025-12-10

- Hightemperature absorption of CO2 and breakthrough characteristics of CaO/FA sorbents
- CIESC Journal Issue 2, Pages: 606-611(2012)
- 作者机构：
  
  南开大学环境科学与工程学院,天津,300071
- 作者简介：
- 基金信息：
- DOI：10.3969/j.issn.0438-1157.2012.02.038
  CLC： Q028.8
- Online First：05 February 2012，
  
  Published：05 February 2012
- 稿件说明：
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杨磊. Hightemperature absorption of CO2 and breakthrough characteristics of CaO/FA sorbents[J]. CIESC Journal, 2012, (2): 606-611.
DOI：

杨磊. Hightemperature absorption of CO2 and breakthrough characteristics of CaO/FA sorbents[J]. CIESC Journal, 2012, (2): 606-611. DOI： 10.3969/j.issn.0438-1157.2012.02.038.

摘要

利用完全煅烧后的CaO和粉煤灰（Fly Ash）为材料制备了CaO/FA吸收剂。在350~650℃温度范围内对其碳酸化反应特性进行了研究。考察了不同质量比的CaO/FA吸收剂吸收CO2的性能。利用XRD、N2吸附等表征手段对吸收剂反应前后产物进行了表征。结果表明：通过水合反应过程，吸收剂比表面积增大，孔径在5~40nm范围内属于中孔，有利于减小CO2向颗粒内部的扩散阻力。CaO/FA吸收剂CO2吸收量随温度的升高而增加。当CaO与粉煤灰的质量比为3:1时制备的吸收剂具有最好的CO2吸收能力，在650℃时其最大CO2吸收量达到了227.13mg/g。通过多次循环试验后，吸附剂仍保持较高的CO2吸收量与稳定吸收性能。失活模型可以很好地预测CaO/FA吸收剂吸收CO2的过程，并得到了理想的吸收速率常数和失活速率常数。

Abstract

The CaO/FA sorbents sorbents were prepared by calcination reaction and hydration reaction using calcium hydroxide and fly ash from Coal-fired power plant waste. The CO2 adsorption capacity of CaO/FA sorbents was investigated in a fix-bed reactor within the temperature range of 350~650℃. The effect of different mass ratio of CaO and fly ash were investigated. The morphological properties of those sorbents before and after the carbonation reaction were characterized by using XRD

SEM and N2 adsorption-desorption. And the deactivation model was used to analysis the experimental breakthrough data. The results indicated that

the sorbents have high BET surface area and large pore volume after hydration reaction

with the rise of carbonation reaction temperature

the CO2 adsorption capacities of CaO/FA sorbents also on the increased. All of CaO/FA sorbents have the minimum of CO2 adsorption capacity when the carbonation temperature at 350℃. When the reaction temperature is within the range of 450~650℃

the CO2 adsorption capacity of those sorbents increased but not obviously. It was found that

CaO/FA sorbents showed a higher CO2 adsorption capacity when the mass ratio of CaO and fly ash was 3:1 and the reaction temperature reach to 650℃

the maximum CO2 adsorption amount reached 227.13mg/g. The CaO/FA sorbents have high and stable adsorption capacity after 9 cycles. In addition

the CO2 breakthrough curves of CaO/FA sorbents are well predicted with the deactivation model

and obtained good adsorption and deactivation rate constants.

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