化工学报 ›› 2024, Vol. 75 ›› Issue (8): 2939-2948.DOI: 10.11949/0438-1157.20240506
收稿日期:
2024-05-08
修回日期:
2024-06-29
出版日期:
2024-08-25
发布日期:
2024-08-21
通讯作者:
陈兵兵
作者简介:
杨明军(1982—),男,博士,教授,yangmj@dlut.edu.cn
基金资助:
Mingjun YANG(), Wei SONG, Lei ZHANG, Zheng LING, Bingbing CHEN(), Yongchen SONG
Received:
2024-05-08
Revised:
2024-06-29
Online:
2024-08-25
Published:
2024-08-21
Contact:
Bingbing CHEN
摘要:
海水中的盐离子成分阻碍水合物成核进程,使得水合物法海洋碳封存耗时长、封存比率低。结合水合物非均相成核特征考虑,认为在局部区域内实现水合物优先成核,进而带动大片海域内水合物扩展生成的封存方法极具工业可行性。因而,开展海水水合物强化生成方法基础研究是推进水合物法海洋碳封存应用落地的基础。基于此,以高效、高转化率生成水合物为目标,在实验室尺度分别探究了高过冷度、添加剂四丁基溴化铵(TBAB)以及变温速率对海水水合物生成特性的影响。结果表明,受到盐离子抑制作用,400 m深度海水中水合物自然生成难度极大,而提高生成过程的过冷度可增强水合物生成驱动力;热力学添加剂TBAB难以显著改善海水水合物的生成条件,但可使生成速率有所提高;0.3 K/min降温速率下的水合物转化率分别是过冷度作用和添加剂作用下的1.28倍和1.19倍。在后续研究中,应考虑多种强化生成方法的耦合作用效果,开发更能缓解海水水合物生成难题的技术手段。
中图分类号:
杨明军, 宋维, 张磊, 凌铮, 陈兵兵, 宋永臣. CO2-海水水合物生成强化方法研究[J]. 化工学报, 2024, 75(8): 2939-2948.
Mingjun YANG, Wei SONG, Lei ZHANG, Zheng LING, Bingbing CHEN, Yongchen SONG. Research on the enhanced method of CO2-seawater hydrate generation[J]. CIESC Journal, 2024, 75(8): 2939-2948.
组别 | 是否生成 | 实验过程 | 恒温时间/min |
---|---|---|---|
1 | 否 | 4.02 MPa恒压、4℃恒温诱导 | 600 |
2 | 否 | 4.06 MPa恒压、1℃恒温诱导 | 500 |
表1 常规生成组实验信息汇总
Table 1 Summary of experimental information for routine generation group
组别 | 是否生成 | 实验过程 | 恒温时间/min |
---|---|---|---|
1 | 否 | 4.02 MPa恒压、4℃恒温诱导 | 600 |
2 | 否 | 4.06 MPa恒压、1℃恒温诱导 | 500 |
组别 | 实验过程 | 生成时刻/min | 生成温度/℃ | 过冷度/℃ | 水转化率/% | 生成速率/(10-6 mol/min) |
---|---|---|---|---|---|---|
3 | 4.09 MPa恒压、-15℃恒温诱导 | 283.4 | -9.84 | 18.95 | 7.95 | 7.54 |
4 | 4.06 MPa恒压、-15℃恒温诱导 | 273.4 | -8.85 | 17.96 | 9.35 | 3.77 |
5 | 4.05 MPa恒压、-15℃恒温诱导 | 274.1 | -8.92 | 18.03 | 5.38 | 3.68 |
表2 高过冷度作用组实验信息汇总
Table 2 Summary of experimental information on the high subcooling action group
组别 | 实验过程 | 生成时刻/min | 生成温度/℃ | 过冷度/℃ | 水转化率/% | 生成速率/(10-6 mol/min) |
---|---|---|---|---|---|---|
3 | 4.09 MPa恒压、-15℃恒温诱导 | 283.4 | -9.84 | 18.95 | 7.95 | 7.54 |
4 | 4.06 MPa恒压、-15℃恒温诱导 | 273.4 | -8.85 | 17.96 | 9.35 | 3.77 |
5 | 4.05 MPa恒压、-15℃恒温诱导 | 274.1 | -8.92 | 18.03 | 5.38 | 3.68 |
组别 | 促进剂浓度/%(质量分数) | 生成时刻/min | 生成温度/℃ | 水转化率/% | 生成速率/(10-6 mol/min) |
---|---|---|---|---|---|
6 | 2 | 296.18 | -11.11 | 9.074 | 5.486 |
7 | 3 | 372.08 | -14.72 | 8.079 | 11.827 |
8 | 4 | 285.37 | -10.04 | 9.359 | 4.933 |
表3 添加剂作用组实验信息汇总
Table 3 Summary of experimental information on additive action group
组别 | 促进剂浓度/%(质量分数) | 生成时刻/min | 生成温度/℃ | 水转化率/% | 生成速率/(10-6 mol/min) |
---|---|---|---|---|---|
6 | 2 | 296.18 | -11.11 | 9.074 | 5.486 |
7 | 3 | 372.08 | -14.72 | 8.079 | 11.827 |
8 | 4 | 285.37 | -10.04 | 9.359 | 4.933 |
图6 不同浓度添加剂作用下的热流曲线及水合物生成特性参数
Fig.6 Heat flow curves and parameters of hydrate generation characteristics in the presence of different concentrations of additives
组别 | 变温速率/(K/min) | 生成时刻/min | 生成温度/℃ | 水转化率/% | 生成速率/(10-6 mol/min) |
---|---|---|---|---|---|
9 | 0.1 | 273.38 | -8.85 | 9.351 | 3.768 |
10 | 0.2 | 165.33 | -11.30 | 9.313 | 5.791 |
11 | 0.3 | 134.55 | -14.73 | 9.647 | 7.146 |
表4 变温速率组实验信息汇总
Table 4 Summary of experimental information for the variable temperature rate group
组别 | 变温速率/(K/min) | 生成时刻/min | 生成温度/℃ | 水转化率/% | 生成速率/(10-6 mol/min) |
---|---|---|---|---|---|
9 | 0.1 | 273.38 | -8.85 | 9.351 | 3.768 |
10 | 0.2 | 165.33 | -11.30 | 9.313 | 5.791 |
11 | 0.3 | 134.55 | -14.73 | 9.647 | 7.146 |
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