水蒸气强化纤维素模板改性钙基吸附剂固碳性能及强度

doi:10.16085/j.issn.1000-6613.2022-1478

化工进展 ›› 2023, Vol. 42 ›› Issue (6): 3217-3225.DOI: 10.16085/j.issn.1000-6613.2022-1478

水蒸气强化纤维素模板改性钙基吸附剂固碳性能及强度

王久衡¹(), 荣鼐¹^,²(), 刘开伟³, 韩龙⁴, 水滔滔¹, 吴岩¹, 穆正勇¹, 廖徐情¹, 孟文佳¹

^1.安徽建筑大学环境与能源工程学院，安徽合肥 230601
^2.安徽省建设领域碳达峰碳中和战略研究院，安徽合肥 230601
^3.安徽建筑大学安徽省先进建筑材料工程实验室，安徽合肥 230601
^4.浙江工业大学机械工程学院，浙江杭州 310014

收稿日期:2022-08-10 修回日期:2022-10-07 出版日期:2023-06-25 发布日期:2023-06-29
通讯作者: 荣鼐
作者简介:王久衡（1997—），男，硕士研究生，研究方向为高温CO2捕集。E-mail：457356146@qq.com。
基金资助:
国家自然科学基金(51706002);安徽省自然科学基金(1808085QE128);安徽省高校省级自然科学研究重点项目(KJ2019A0762);安徽省高校自然科学研究项目(2022AH030034)

Enhanced CO₂ capture performance and strength of cellulose-templated CaO-based pellets with steam reactivation

WANG Jiuheng¹(), RONG Nai¹^,²(), LIU Kaiwei³, HAN Long⁴, SHUI Taotao¹, WU Yan¹, MU Zhengyong¹, LIAO Xuqing¹, MENG Wenjia¹

^1.School of Environment and Energy Engineering, Anhui Jianzhu University, Hefei 230601, Anhui, China
^2.Anhui Institute of Strategic Study in Carbon Emissions Peak and Carbon Neutrality in Urban-rural Development, Hefei 230601, Anhui, China
^3.Anhui Province Engineering Laboratory of Advanced Building Materials, Anhui Jianzhu University, Hefei 230601, Anhui, China
^4.School of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310014, Zhejiang, China

Received:2022-08-10 Revised:2022-10-07 Online:2023-06-25 Published:2023-06-29
Contact: RONG Nai

摘要/Abstract

摘要：

采用挤出-滚圆法制备了纤维素模板水泥支撑钙基吸附剂颗粒，基于双固定床反应器探究了煅烧时蒸汽活化对改性吸附剂的CO₂捕获性能、力学性能和微观结构的影响特性。实验结果表明，在热致烧结和气氛诱导烧结共同作用下，吸附剂颗粒形成较稳定的孔隙结构，固碳量和力学强度均维持在较高水平。煅烧时通入10%（体积分数）水蒸气，含10%（质量分数）纤维素和5%（质量分数）水泥的吸附剂第20次循环CO₂捕获量为0.32g/g，相比原始吸附剂（0.138g/g）和未活化的合成吸附剂（0.20g/g）分别提高了132%和60%。且活化后颗粒平均破碎强度为14.7N，比无蒸汽条件下增强约2.7倍。50次长循环测试后，其强度进一步提升至20.5N。煅烧时蒸汽活化可同时显著提升吸附剂CO₂捕获量和力学性能。

关键词: 纤维素模板, 钙基吸附剂, CO₂捕集, 蒸汽活化, 破碎强度

Abstract:

Cellulose-templated CaO-basted pellets were prepared by an extrusion-spheronization method. The effects of steam addition during calcination on the CO₂ capture capacity, mechanical properties, and microstructure of the modified sorbents were investigated based on a double fixed-bed reactor. The experimental results showed that the sorbent pellets formed stable pore structures under the combined effect of thermal sintering and atmosphere-induced sintering, ensuring that the CO₂ capture capacity and mechanical strength were maintained at a high level. The CO₂ uptake of the sorbent with 10% (mass ratio) cellulose and 5% (mass ratio) cement as well as 10% volume fraction steam reactivation was 0.32g/g after 20cycles, which was 132% and 60% higher than the raw sorbent (0.138g/g) and the modified sorbent (0.20g/g) without steam injection, respectively. Moreover, the average crushing strength of the pellets calcined with adding 10% volume fraction steam into the calcination atmosphere was 14.7N, which was enhanced by about 2.7 times that without steam. The strength was further increased to 20.5N after 50 cycles. Thus, steam injection during calcination demonstrated great potential in retaining CO₂ capture durability and improving the mechanical properties of the cellulose-templated sorbent.

Key words: cellulose-templated, CaO-basted sorbent, CO₂ capture, steam reactivation, mechanical strength

中图分类号:

TK09

王久衡, 荣鼐, 刘开伟, 韩龙, 水滔滔, 吴岩, 穆正勇, 廖徐情, 孟文佳. 水蒸气强化纤维素模板改性钙基吸附剂固碳性能及强度[J]. 化工进展, 2023, 42(6): 3217-3225.

WANG Jiuheng, RONG Nai, LIU Kaiwei, HAN Long, SHUI Taotao, WU Yan, MU Zhengyong, LIAO Xuqing, MENG Wenjia. Enhanced CO₂ capture performance and strength of cellulose-templated CaO-based pellets with steam reactivation[J]. Chemical Industry and Engineering Progress, 2023, 42(6): 3217-3225.

图/表 16

图1 吸附剂颗粒制备流程图和双固定床系统示意图

图2 纤维素模板钙基吸附剂循环捕集CO2性能

表1 合成钙基吸附剂中各组分质量分数（%）

样品	CaO	Al₂O₃	MgO	SiO₂	K₂O	Fe₂O₃	SrO	其他
C0M0	98.543	0.196	0.302	0.311	0.052	0.297	0.099	0.201
C5M10	95.477	3.518	0.568	0.179	0.013	0.123	0.022	0.101
C10M10	91.877	7.127	0.529	0.198	0.015	0.124	0.025	0.106
C15M10	87.682	11.29	0.498	0.228	0	0.179	0.017	0.105
C20M10	83.876	15.017	0.541	0.231	0.013	0.149	0.021	0.151

图3 C5M10吸附剂SEM-EDX分析

图4 煅烧后C0M0和C5M10吸附剂XRD谱图

图5 蒸汽含量对C5M10循环捕集CO2影响

表2 蒸汽活化C5M10第20次循环CO2捕获量

蒸汽体积分数/%	C₂₀/g·g^-1	提升幅度（与C0M0对比）/%	提升幅度（与未活化C5M10对比）/%
0	0.20	45	0
10	0.32	132	60
30	0.245	77.5	22.5
60	0.22	59.0	10

图6 不同蒸汽含量煅烧下C5M10循环20次后SEM图

表3 C5M10经 20次煅烧蒸汽活化后比表面积和比孔容

蒸汽体积分数/%	比表面积/m²·g^-1	比孔容/cm³·g^-1
0	3.242	0.0322
10	3.124	0.0216
30	2.602	0.0310
60	2.705	0.0231

图7 C5M10经过20次煅烧蒸汽活化后的孔径分布

图8 蒸汽活化方式对C5M10的CO2捕集性能的影响

图9 不同蒸汽活化方式下CO2捕集能力总结

图10 新煅烧C5M10及不同蒸汽活化方式下循环50次后SEM形貌

图11 纤维素模板改性吸附剂20次循环后强度分布

图12 不同蒸汽活化方式下C5M10颗粒强度分布

图13 蒸汽活化C5M10的磨损率

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水蒸气强化纤维素模板改性钙基吸附剂固碳性能及强度

Enhanced CO₂ capture performance and strength of cellulose-templated CaO-based pellets with steam reactivation

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水蒸气强化纤维素模板改性钙基吸附剂固碳性能及强度

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Enhanced CO₂ capture performance and strength of cellulose-templated CaO-based pellets with steam reactivation