化工学报 ›› 2023, Vol. 74 ›› Issue (4): 1539-1548.DOI: 10.11949/0438-1157.20221565
收稿日期:
2022-12-05
修回日期:
2023-04-10
出版日期:
2023-04-05
发布日期:
2023-06-02
通讯作者:
梁斌
作者简介:
王皓(1998—),男,硕士研究生,wanghaoscusce@qq.com
基金资助:
Hao WANG1(), Siyang TANG1, Shan ZHONG1, Bin LIANG1,2()
Received:
2022-12-05
Revised:
2023-04-10
Online:
2023-04-05
Published:
2023-06-02
Contact:
Bin LIANG
摘要:
单乙醇胺(MEA)溶液吸收二氧化碳在碳捕集封存或利用技术中应用广泛,但MEA吸收富液再生能耗高。有报道称具有催化性质的固体填料可以强化CO2解吸,但固体作用原理并未被清楚证实。为了分析颗粒填料的作用,通过比较不同固体颗粒(硅铝比为25、50、80的HZSM-5和活性炭)在再生过程中的作用,证实了非稳态过程HZSM-5颗粒存在表面酸中心吸附有机胺促进解吸的现象,最大有15.75%的促进效果,呈现HZSM-5-25>HZSM-5-50>HZSM-5-80>AC>Blank的规律。但是,颗粒酸中心有限的吸附量不能持续促进解吸,恒温段的促进效果降低至1.61%~2.67%,此时传质即气泡成核是提升解吸速率的主要原因,颗粒表面提供非均相成核位点,疏水性强的表面更可能促进气液分离。通过传热影响分析,表明改变热通量对CO2解吸速率的影响显著,相比传质速率与反应速率,传热速率在影响解吸速率的因素中占据主要地位。
中图分类号:
王皓, 唐思扬, 钟山, 梁斌. MEA吸收CO2富液解吸过程中固体颗粒表面的强化作用分析[J]. 化工学报, 2023, 74(4): 1539-1548.
Hao WANG, Siyang TANG, Shan ZHONG, Bin LIANG. An investigation of the enhancing effect of solid particle surface on the CO2 desorption behavior in chemical sorption process with MEA solution[J]. CIESC Journal, 2023, 74(4): 1539-1548.
时间/s | 标准差 | ||||
---|---|---|---|---|---|
HZSM-5-25 | HZSM-5-50 | HZSM-5-80 | AC | Blank | |
0 | 3.59×10-3 | 3.59×10-3 | 3.59×10-3 | 3.59×10-3 | 3.59×10-3 |
300 | 0 | 3.35×10-3 | 1.38×10-3 | 1.84×10-3 | 2.88×10-3 |
600 | 1.61×10-3 | 3.25×10-3 | 2.31×10-3 | 2.39×10-3 | 0.80×10-3 |
900 | 3.35×10-3 | 3.50×10-3 | 2.80×10-3 | 1.84×10-3 | 0 |
1200 | 0.93×10-3 | 3.04×10-3 | 2.01×10-3 | 1.66×10-3 | 2.3×10-3 |
1800 | 4.26×10-3 | 0.80×10-3 | 1.22×10-3 | 2.39×10-3 | 2.01×10-3 |
2400 | 0.57×10-3 | 3.34×10-3 | 1.13×10-3 | 3.60×10-3 | 0 |
表1 CO2负载量标准差
Table 1 Standard deviation of CO2 loading
时间/s | 标准差 | ||||
---|---|---|---|---|---|
HZSM-5-25 | HZSM-5-50 | HZSM-5-80 | AC | Blank | |
0 | 3.59×10-3 | 3.59×10-3 | 3.59×10-3 | 3.59×10-3 | 3.59×10-3 |
300 | 0 | 3.35×10-3 | 1.38×10-3 | 1.84×10-3 | 2.88×10-3 |
600 | 1.61×10-3 | 3.25×10-3 | 2.31×10-3 | 2.39×10-3 | 0.80×10-3 |
900 | 3.35×10-3 | 3.50×10-3 | 2.80×10-3 | 1.84×10-3 | 0 |
1200 | 0.93×10-3 | 3.04×10-3 | 2.01×10-3 | 1.66×10-3 | 2.3×10-3 |
1800 | 4.26×10-3 | 0.80×10-3 | 1.22×10-3 | 2.39×10-3 | 2.01×10-3 |
2400 | 0.57×10-3 | 3.34×10-3 | 1.13×10-3 | 3.60×10-3 | 0 |
时间/s | 相对偏差/% | ||||
---|---|---|---|---|---|
HZSM-5-25 | HZSM-5-50 | HZSM-5-80 | AC | Blank | |
0~300 | 4.2 | 0.1 | 7.1 | 3.0 | 9.0 |
300~600 | 6.4 | 5.6 | 3.0 | 5.2 | 4.0 |
600~900 | 8.5 | 10.3 | 7.9 | 7.6 | 3.1 |
900~1200 | 1.9 | 1.5 | 7.8 | 3.3 | 0.9 |
1200~1800 | 4.7 | 5.7 | 12.0 | 11.0 | 15.6 |
1800~2400 | 0.5 | 0.1 | 2.1 | 9.8 | 11.0 |
平均值 | 4.4 | 3.9 | 6.7 | 6.7 | 7.2 |
表2 质量守恒相对偏差
Table 2 Relative deviation of mass balance
时间/s | 相对偏差/% | ||||
---|---|---|---|---|---|
HZSM-5-25 | HZSM-5-50 | HZSM-5-80 | AC | Blank | |
0~300 | 4.2 | 0.1 | 7.1 | 3.0 | 9.0 |
300~600 | 6.4 | 5.6 | 3.0 | 5.2 | 4.0 |
600~900 | 8.5 | 10.3 | 7.9 | 7.6 | 3.1 |
900~1200 | 1.9 | 1.5 | 7.8 | 3.3 | 0.9 |
1200~1800 | 4.7 | 5.7 | 12.0 | 11.0 | 15.6 |
1800~2400 | 0.5 | 0.1 | 2.1 | 9.8 | 11.0 |
平均值 | 4.4 | 3.9 | 6.7 | 6.7 | 7.2 |
颗粒 | 平均解吸速率/(mmol/min) | 促进效果/% |
---|---|---|
HZSM-5-25 | 9.522 | 15.75 |
HZSM-5-50 | 9.299 | 13.04 |
HZSM-5-80 | 9.000 | 9.41 |
AC | 8.358 | 1.60 |
Blank | 8.226 | — |
表3 升温段平均解吸速率
Table 3 Average desorption rates in heating section
颗粒 | 平均解吸速率/(mmol/min) | 促进效果/% |
---|---|---|
HZSM-5-25 | 9.522 | 15.75 |
HZSM-5-50 | 9.299 | 13.04 |
HZSM-5-80 | 9.000 | 9.41 |
AC | 8.358 | 1.60 |
Blank | 8.226 | — |
颗粒 | 平均 解吸速率/(mmol/min) | CO2平衡 浓度/ (mol/L) | CO2实际 浓度/ (mol/L) | 过饱 和度 | 促进 效果/% |
---|---|---|---|---|---|
HZSM-5-25 | 8.7371 | 0.0016 | 0.0188 | 10.72 | 2.20 |
HZSM-5-50 | 8.7770 | 0.0016 | 0.0188 | 10.72 | 2.67 |
HZSM-5-80 | 8.6973 | 0.00159 | 0.0209 | 12.15 | 1.74 |
AC | 8.6861 | 0.00159 | 0.0212 | 12.35 | 1.61 |
Blank | 8.5487 | 0.00157 | 0.0272 | 16.37 | — |
表4 恒温段平均解吸速率
Table 4 Average desorption rate of constant temperature section
颗粒 | 平均 解吸速率/(mmol/min) | CO2平衡 浓度/ (mol/L) | CO2实际 浓度/ (mol/L) | 过饱 和度 | 促进 效果/% |
---|---|---|---|---|---|
HZSM-5-25 | 8.7371 | 0.0016 | 0.0188 | 10.72 | 2.20 |
HZSM-5-50 | 8.7770 | 0.0016 | 0.0188 | 10.72 | 2.67 |
HZSM-5-80 | 8.6973 | 0.00159 | 0.0209 | 12.15 | 1.74 |
AC | 8.6861 | 0.00159 | 0.0212 | 12.35 | 1.61 |
Blank | 8.5487 | 0.00157 | 0.0272 | 16.37 | — |
名称 | 富液CO2负载量/(mol/mol) | 解吸温度/℃ | 平均解吸速率/ (mmol/min) | |
---|---|---|---|---|
Blank1 | 0.4998 | 91~92 | 6.790① | 6.107② |
Blank2 | 0.4886 | 91~92 | 6.714① | 6.107② |
HZSM-5-25 | 0.4886 | 91~92 | 6.763① | 6.136② |
表5 传热面积和颗粒对解吸速率的影响
Table 5 Effect of heat transfer area and particles on desorption rate
名称 | 富液CO2负载量/(mol/mol) | 解吸温度/℃ | 平均解吸速率/ (mmol/min) | |
---|---|---|---|---|
Blank1 | 0.4998 | 91~92 | 6.790① | 6.107② |
Blank2 | 0.4886 | 91~92 | 6.714① | 6.107② |
HZSM-5-25 | 0.4886 | 91~92 | 6.763① | 6.136② |
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