水合物法模拟海底封存CO2气体的实验

doi:10.16085/j.issn.1000-6613.2020-1382

化工进展 ›› 2021, Vol. 40 ›› Issue (6): 3489-3498.DOI: 10.16085/j.issn.1000-6613.2020-1382

水合物法模拟海底封存CO₂气体的实验

姚远欣¹^,²^,³^,⁴^,⁵^,⁶(), 周雪冰¹^,²^,³^,⁴^,⁵, 李栋梁¹^,²^,³^,⁴^,⁵^,⁶(), 梁德青¹^,²^,³^,⁴^,⁵^,⁶

^1.中国科学院广州能源研究所，广东广州 510640
^2.中国科学院天然气水合物重点实验室，广东广州 510640
^3.广东省新能源和可再生能源研究开发与应用重点实验室，广东广州 510640
^4.中国科学院广州天然气水合物中心，广东广州 510640
^5.天然气水合物国家重点实验室，北京 100028
^6.中国科学院大学，北京 100049

收稿日期:2020-07-17 修回日期:2020-11-02 出版日期:2021-06-06 发布日期:2021-06-22
通讯作者: 李栋梁
作者简介:姚远欣（1994—），男，硕士研究生，研究方向为天然气水合物。E-mail：yaoyx@ms.giec.ac.cn。
基金资助:
国家自然科学基金(51661165011);广东省促进经济发展专项资金（海洋经济发展用途）（GDOE[2019]A39）;广东省自然科学基金(2018B0303110007);广东省科技计划(2021A0505030053)

Experiments of CO₂ gas sequestration on the seabed by hydrate method

YAO Yuanxin¹^,²^,³^,⁴^,⁵^,⁶(), ZHOU Xuebing¹^,²^,³^,⁴^,⁵, LI Dongliang¹^,²^,³^,⁴^,⁵^,⁶(), LIANG Deqing¹^,²^,³^,⁴^,⁵^,⁶

^1.Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, Guangdong, China
^2.CAS Key Laboratory of Gas Hydrate, Guangzhou 510640, Guangdong, China
^3.Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou 510640, Guangdong, China
^4.Guangzhou Center for Gas Hydrate Research, Chinese Academy of Sciences, Guangzhou 510640, Guangdong, China
^5.State Key Laboratory of Natural Gas Hydrate, Beijing 100028, China
^6.University of Chinese Academy of Sciences, Beijing 100049, China

Received:2020-07-17 Revised:2020-11-02 Online:2021-06-06 Published:2021-06-22
Contact: LI Dongliang

摘要/Abstract

摘要：

向海底地层和枯竭油气藏中注入CO₂气体形成稳定的CO₂水合物是一种极具前景的CO₂封存技术。为了进一步探究这一技术，本文利用水合物法进行了多组3MPa、5℃天然湿砂的CO₂封存实验模拟。初始水饱和度设置为10%、40%、70%，分别进行了纯水封存实验和3.5%（质量分数）NaCl溶液的封存实验，还利用自主研发的反应釜系统探索了3种不同进气方向（顶部进气、横置进气、底部进气）下的CO₂封存效果。结果发现横置进气的封存量普遍大于顶部进气的封存量，底部进气的封存量最小，而且横置进气的封存速度最快；初始水饱和度越高，水合物饱和度就越高，但水合物转化率越低，CO₂固态封存比例也越低；与纯水实验相比，盐的存在降低了CO₂的封存量，固态封存比例也会低于纯水实验，但封存速度更快。本文为实际工程操作时合理控制封存地层水饱和度、盐度以及合适的进气方向提供了依据。

关键词: 二氧化碳, 水合物, 海洋封存, 沉积物, 反应动力学

Abstract:

It is a promising CO₂ sequestration technology to inject CO₂ gas into seabed strata and depleted oil and gas reservoirs to form stable CO₂ hydrate. In order to further explore this technology, the CO₂ sequestration experiment simulation of natural wet sand at 3MPa and 5℃ was carried out by using hydrate method. The initial water saturation was set at 10%, 40% and 70%, respectively. The storage experiments of pure water and 3.5% (mass fraction) NaCl solution were carried out. The CO₂ storage effect under three different intake directions (top intake, horizontal intake and bottom intake) was also explored with the reaction still system independently developed. The results show that the storage stock of the horizontal inlet is generally larger than that of the top inlet, while the storage stock of the bottom inlet is the smallest, and the storage speed of the horizontal inlet is the fastest. It is also found that the higher the initial water saturation, the higher the hydrate saturation, but the lower the hydrate conversion rate, the lower the solid state sequestration ratio. Compared with the pure water experiment, the presence of salt reduces the CO₂ storage stock, and the proportion of solid storage is lower than that of the pure water experiment, but the storage speed is faster. The experiment provides a basis for the reasonable control of the water saturation, salinity and the appropriate intake direction in the actual engineering operation.

Key words: carbon dioxide(CO₂), hydrate, marine storage, sediment, reaction kinetics

中图分类号:

TE992.1

姚远欣, 周雪冰, 李栋梁, 梁德青. 水合物法模拟海底封存CO₂气体的实验[J]. 化工进展, 2021, 40(6): 3489-3498.

YAO Yuanxin, ZHOU Xuebing, LI Dongliang, LIANG Deqing. Experiments of CO₂ gas sequestration on the seabed by hydrate method[J]. Chemical Industry and Engineering Progress, 2021, 40(6): 3489-3498.

图/表 10

参考文献 29

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组	转化率/%	饱和度/%	组	转化率/%	饱和度/%
1	69.45	7.64	10	22.28	2.45
2	68.93	7.58	11	24.37	2.68
3	51.1	5.62	12	18.35	2.02
4	51.76	22.77	13	25.95	11.42
5	52.68	23.18	14	25.95	11.42
6	42.91	18.88	15	24.11	10.61
7	35.42	27.27	16	17.00	13.09
8	36.32	27.96	17	22.09	17.01
9	36.32	25.34	18	15.16	11.68

组	转化率/%	饱和度/%	组	转化率/%	饱和度/%
1	69.45	7.64	10	22.28	2.45
2	68.93	7.58	11	24.37	2.68
3	51.1	5.62	12	18.35	2.02
4	51.76	22.77	13	25.95	11.42
5	52.68	23.18	14	25.95	11.42
6	42.91	18.88	15	24.11	10.61
7	35.42	27.27	16	17.00	13.09
8	36.32	27.96	17	22.09	17.01
9	36.32	25.34	18	15.16	11.68

组	封存速度/min	组	封存速度/min
1	169	10	45.5
2	143	11	47.5
3	197	12	56
4	742.5	13	295
5	421.5	14	132.5
6	626.5	15	493
7	1128.5	16	496
8	942.5	17	330
9	730.5	18	953.5

组	封存速度/min	组	封存速度/min
1	169	10	45.5
2	143	11	47.5
3	197	12	56
4	742.5	13	295
5	421.5	14	132.5
6	626.5	15	493
7	1128.5	16	496
8	942.5	17	330
9	730.5	18	953.5

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水合物法模拟海底封存CO₂气体的实验

Experiments of CO₂ gas sequestration on the seabed by hydrate method

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组	体系	初始水饱和度/%	进气方向	组	体系	初始水饱和度/%	进气方向
1	纯水	10	顶部	10	3.5% NaCl	10	顶部
2			横置	11			横置
3			底部	12			底部
4		40	顶部	13		40	顶部
5			横置	14			横置
6			底部	15			底部
7		70	顶部	16		70	顶部
8			横置	17			横置
9			底部	18			底部