烟气中水蒸气对钙基吸收剂碳酸化的影响特性

doi:10.3969/j.issn.0438-1157.2013.04.033

化工学报 ›› 2013, Vol. 64 ›› Issue (4): 1364-1372.DOI: 10.3969/j.issn.0438-1157.2013.04.033

烟气中水蒸气对钙基吸收剂碳酸化的影响特性

陈惠超, 赵长遂, 沈鹏

能源热转换及其过程测控教育部重点实验室,东南大学能源与环境学院,江苏南京210096

收稿日期:2012-07-09 修回日期:2012-09-14 出版日期:2013-04-05 发布日期:2013-04-05
通讯作者: 陈惠超
作者简介:陈惠超(1981—),女,博士,讲师。
基金资助:
国家自然科学(青年)基金项目(51206024);中国博士后科学基金特别资助项目(2012T50428);中国博士后科学基金项目(2011M500837)。

Effect of steam in flue gas on CO₂ capture for calcium based sorbent

CHEN Huichao, ZHAO Changsui, SHEN Peng

Key Laboratory of Energy Thermal Conversion and Control, Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, Jiangsu, China

Received:2012-07-09 Revised:2012-09-14 Online:2013-04-05 Published:2013-04-05
Supported by:
supported by the National Natural Science Foundation of China(51206024),the Postdoctoral Science Special Foundation of China(2012T50428) and the Postdoctoral Science Foundation of China(2011M500837).

摘要/Abstract

摘要： 在循环煅烧/碳酸化反应系统上考察煅烧气氛和碳酸化气氛中水蒸气含量以及CO₂分压对钙基吸收剂成型颗粒碳酸化的影响,通过对钙基吸收剂微观结构分析(扫描电镜、氮吸附分析)以理解水蒸气影响碳酸化特性的机理。结果表明,煅烧气氛和碳酸化气氛中的水蒸气均可提高钙基吸收剂的碳酸化转化率,水蒸气含量分别为10%和5%时,吸收剂的碳酸化性能较好;水蒸气在碳酸化气氛中对高铝水泥改性吸收剂的改善作用较石灰石显著。煅烧气氛中的CO₂分压越高,烧结现象越严重,降低钙基吸收剂的捕集效率;碳酸化气氛CO₂分压提高,有利于提高钙基吸收剂的碳酸化转化率。烟气中水蒸气丰富了吸收剂的微观孔隙,使得吸收剂捕集CO₂性能得到改善。

关键词: 水蒸气, 钙基吸收剂, 碳酸化

Abstract: Effect of steam and CO₂ concentration in atmosphere at both calcination and carbonation stages on CO₂ capture for calcium-based sorbent was investigated in a twin-bed calcination/carbonation cycle reaction system.Microstructure analysis from electronic scan image and N₂ adsorption/desorption was supplemented to understand mechanism affecting carbonation by steam.The results show that steam in atmosphere of both calcination and carbonation stages can enhance CO₂ capture performance of sorbents, and the optimal mass percent in these atmospheres is 10% and 5%, respectively.Effect of steam at carbonation stage on CO₂ capture was stronger for sorbent modified by alumina cement than for natural limestone.High CO₂ partial pressure at calcination stage results in severe sintering, thus low capacity of CO₂ capture.Increase of CO₂ capture performance can be achieved by using steam in the atmosphere of both calcination and carbonation stages because steam in flue gas can improve micro-porosity of these sorbents.

Key words: steam, calcium-based sorbent, carbonation

中图分类号:

TK09

陈惠超, 赵长遂, 沈鹏. 烟气中水蒸气对钙基吸收剂碳酸化的影响特性[J]. 化工学报, 2013, 64(4): 1364-1372.

CHEN Huichao, ZHAO Changsui, SHEN Peng. Effect of steam in flue gas on CO₂ capture for calcium based sorbent[J]. CIESC Journal, 2013, 64(4): 1364-1372.

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烟气中水蒸气对钙基吸收剂碳酸化的影响特性

Effect of steam in flue gas on CO₂ capture for calcium based sorbent

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烟气中水蒸气对钙基吸收剂碳酸化的影响特性

Effect of steam in flue gas on CO2 capture for calcium based sorbent

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Effect of steam in flue gas on CO₂ capture for calcium based sorbent