化工进展 ›› 2023, Vol. 42 ›› Issue (S1): 498-509.DOI: 10.16085/j.issn.1000-6613.2023-0325
收稿日期:
2023-03-03
修回日期:
2023-05-10
出版日期:
2023-10-25
发布日期:
2023-11-30
通讯作者:
顾永正
作者简介:
顾永正(1991—),男,博士,高级工程师,研究方向为清洁低碳发电技术研究及工程实践。E-mail:yongzheng.gu@chnenergy.com.cn。
基金资助:
GU Yongzheng1(), ZHANG Yongsheng2
Received:
2023-03-03
Revised:
2023-05-10
Online:
2023-10-25
Published:
2023-11-30
Contact:
GU Yongzheng
摘要:
为清晰描述HBr改性飞灰(HBr-FA)对Hg0吸附的全过程,基于固定床动态吸附实验,在同时考虑扩散和表面吸附氧化的条件下,建立了固定床中HBr-FA对Hg0的吸附动力学模型,讨论了Hg0吸附氧化过程的关键影响因素,探究了Hg0在扩散区域和表面活性位上的动力学行为。结果表明:该模型综合考虑了轴向返混、内外扩散和本征动力学过程,能够较好地拟合实验穿透曲线,并可求得相应的动力学参数,对气膜扩散系数更加敏感;初始Hg0浓度的提高可提供更高的能量克服扩散阻力,适当提高流量和床层厚度可减小外扩散阻力,进而表现出更优越的表观吸附氧化效果;该模型还可得到床层内和颗粒内(扩散和动力学区域)的Hg0浓度分布,发现在吸附初期,外扩散阻力对改性飞灰吸附氧化Hg0的过程影响更大。
中图分类号:
顾永正, 张永生. HBr改性飞灰对Hg0的动态吸附及动力学模型[J]. 化工进展, 2023, 42(S1): 498-509.
GU Yongzheng, ZHANG Yongsheng. Dynamic behavior and kinetic model of Hg0 adsorption by HBr-modified fly ash[J]. Chemical Industry and Engineering Progress, 2023, 42(S1): 498-509.
工况 | 吸附剂质量m/mg | 初始Hg0浓度C0/μg·m-3 | 入口流量Q/L·min-1 | 床层厚度Z/mm |
---|---|---|---|---|
1 | 30 | 9.5 | 1 | 1.2 |
2 | 30 | 18.3 | 1 | 1.2 |
3 | 30 | 24 | 1 | 1.2 |
4 | 30 | 9.5 | 2 | 1.2 |
5 | 30 | 9.5 | 4 | 1.2 |
6 | 15 | 9.5 | 1 | 0.6 |
7 | 60 | 9.5 | 1 | 2.4 |
表1 固定床动态吸附实验工况
工况 | 吸附剂质量m/mg | 初始Hg0浓度C0/μg·m-3 | 入口流量Q/L·min-1 | 床层厚度Z/mm |
---|---|---|---|---|
1 | 30 | 9.5 | 1 | 1.2 |
2 | 30 | 18.3 | 1 | 1.2 |
3 | 30 | 24 | 1 | 1.2 |
4 | 30 | 9.5 | 2 | 1.2 |
5 | 30 | 9.5 | 4 | 1.2 |
6 | 15 | 9.5 | 1 | 0.6 |
7 | 60 | 9.5 | 1 | 2.4 |
参数 | HBr-FA |
---|---|
振实堆密度 | 0.85×103 |
表观密度ρp/kg·m-3 | 2.06×103 |
真密度ρs/kg·m-3 | 2.14×103 |
床层空隙率εb | 0.587 |
颗粒孔隙率ε | 0.037 |
平均粒径Rp/m | 1.61×10-5 |
平均孔半径rpore/cm | 1.53×10-6 |
表2 HBr-FA物性参数
参数 | HBr-FA |
---|---|
振实堆密度 | 0.85×103 |
表观密度ρp/kg·m-3 | 2.06×103 |
真密度ρs/kg·m-3 | 2.14×103 |
床层空隙率εb | 0.587 |
颗粒孔隙率ε | 0.037 |
平均粒径Rp/m | 1.61×10-5 |
平均孔半径rpore/cm | 1.53×10-6 |
动力学参数 | 数值 |
---|---|
k1/m3·(μg·s) -1 | 3.326×10-4 |
qm/μg·kg-1 | 2.518×105 |
K/m3·μg-1 | 0.105 |
表3 根据不同入口Hg0浓度条件计算本征动力学方程中的动力学参数
动力学参数 | 数值 |
---|---|
k1/m3·(μg·s) -1 | 3.326×10-4 |
qm/μg·kg-1 | 2.518×105 |
K/m3·μg-1 | 0.105 |
工况 | 初始Hg0浓度 /μg·m-3 | DZ /m2·s-1 | De /m2·s-1 | kg /m·s-1 | Pe | Bi |
---|---|---|---|---|---|---|
1 | 9.5 | 4.77×10-4 | 9.70×10-7 | 1.81×10-2 | 1.484 | 0.100 |
2 | 18.3 | 7.37×10-4 | 6.28×10-7 | 7.40×10-3 | 0.960 | 0.063 |
3 | 24 | 7.19×10-4 | 4.55×10-7 | 1.40×10-2 | 0.984 | 0.165 |
表4 不同入口Hg0浓度下的扩散系数参数估计值
工况 | 初始Hg0浓度 /μg·m-3 | DZ /m2·s-1 | De /m2·s-1 | kg /m·s-1 | Pe | Bi |
---|---|---|---|---|---|---|
1 | 9.5 | 4.77×10-4 | 9.70×10-7 | 1.81×10-2 | 1.484 | 0.100 |
2 | 18.3 | 7.37×10-4 | 6.28×10-7 | 7.40×10-3 | 0.960 | 0.063 |
3 | 24 | 7.19×10-4 | 4.55×10-7 | 1.40×10-2 | 0.984 | 0.165 |
工况 | 入口流量 /L·min-1 | DZ /m2·s-1 | De /m2·s-1 | kg /m·s-1 | Pe | Bi |
---|---|---|---|---|---|---|
1 | 1 | 4.77×10-4 | 9.70×10-7 | 1.81×10-2 | 1.484 | 0.100 |
4 | 2 | 8.12×10-4 | 1.40×10-6 | 2.43×10-2 | 1.743 | 0.093 |
5 | 4 | 5.03×10-3 | 7.51×10-6 | 1.29×10-2 | 0.564 | 0.009 |
表5 不同入口流量下的扩散系数参数估计值
工况 | 入口流量 /L·min-1 | DZ /m2·s-1 | De /m2·s-1 | kg /m·s-1 | Pe | Bi |
---|---|---|---|---|---|---|
1 | 1 | 4.77×10-4 | 9.70×10-7 | 1.81×10-2 | 1.484 | 0.100 |
4 | 2 | 8.12×10-4 | 1.40×10-6 | 2.43×10-2 | 1.743 | 0.093 |
5 | 4 | 5.03×10-3 | 7.51×10-6 | 1.29×10-2 | 0.564 | 0.009 |
工况 | 床层厚度 /mm | DZ /m2·s-1 | De /m2·s-1 | kg /m·s-1 | Pe | Bi |
---|---|---|---|---|---|---|
6 | 0.6 | 2.05×10-3 | 2.15×10-6 | 1.16×10-1 | 0.173 | 0.289 |
1 | 1.2 | 4.77×10-4 | 9.70×10-7 | 1.81×10-2 | 1.484 | 0.100 |
7 | 2.4 | 4.66×10-4 | 4.29×10-7 | 4.51×10-2 | 3.040 | 0.562 |
表6 不同床层厚度下扩散系数参数估计值
工况 | 床层厚度 /mm | DZ /m2·s-1 | De /m2·s-1 | kg /m·s-1 | Pe | Bi |
---|---|---|---|---|---|---|
6 | 0.6 | 2.05×10-3 | 2.15×10-6 | 1.16×10-1 | 0.173 | 0.289 |
1 | 1.2 | 4.77×10-4 | 9.70×10-7 | 1.81×10-2 | 1.484 | 0.100 |
7 | 2.4 | 4.66×10-4 | 4.29×10-7 | 4.51×10-2 | 3.040 | 0.562 |
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