Experimental study on growth characteristics of CO<sub>2</sub> hydrates in quartz sand

SHEN Long; SHAO Ziyue; ZENG Wenjing; LI Yanxia; SHEN Xiaodong; HE Houqiang

doi:10.12434/j.issn.2097-2547.20240052

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Experimental study on growth characteristics of CO₂ hydrates in quartz sand

- Experimental study on growth characteristics of CO₂ hydrates in quartz sand
- Vol. 49, Issue 12, Pages: 127-133(2024)
- 作者机构：
  
  成都理工大学油气藏地质及开发工程全国重点实验室，四川成都 610059
- 作者简介：
- 基金信息：
- DOI：10.12434/j.issn.2097-2547.20240052
  CLC： TE38
- Published：25 December 2024，
  
  Received：06 February 2024，
  
  Revised：25 March 2024，
- 稿件说明：
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沈龙,邵子越,曾文静等.石英砂中二氧化碳水合物生长特性实验研究[J].低碳化学与化工,2024,49(12):127-133.

SHEN Long,SHAO Ziyue,ZENG Wenjing,et al.Experimental study on growth characteristics of CO₂ hydrates in quartz sand[J].Low-carbon Chemistry and Chemical Engineering,2024,49(12):127-133.
沈龙,邵子越,曾文静等.石英砂中二氧化碳水合物生长特性实验研究[J].低碳化学与化工,2024,49(12):127-133. DOI： 10.12434/j.issn.2097-2547.20240052.

SHEN Long,SHAO Ziyue,ZENG Wenjing,et al.Experimental study on growth characteristics of CO₂ hydrates in quartz sand[J].Low-carbon Chemistry and Chemical Engineering,2024,49(12):127-133. DOI： 10.12434/j.issn.2097-2547.20240052.

摘要

向海底沉积物层注入二氧化碳（CO

）形成CO

水合物是一种有效的碳封存方式，但存在水合物生成诱导时间长、生长速率慢等问题。将石英砂作为多孔介质，采用恒温恒容法，在实验温度为273.65 K、初始压力为3.5 MPa的条件下，研究了石英砂粒径、初始含水饱和度和添加剂对CO

水合物生长动力学和宏观形貌演化规律的影响。结果表明，3.4% NaCl溶液（百分数为质量分数，下同）中，设定初始含水饱和度为75%，当石英砂粒径为26~40目时，CO

水合物生长速率相对最快、生成量最多，最终耗气量为0.0285 mol，水的转化率达到7.27%。设定石英砂粒径为10~18目，当初始含水饱和度为50%时，CO

水合物生成量相对最多，最终耗气量为0.0384 mol，水的转化率和转化量分别为17.17%和4.29 g。1% L-甲硫氨酸溶液中，CO

水合物生长速率加快，生成量增大，L-甲硫氨酸具有明显的促进作用，最终耗气量是纯水中的3.6倍，水的转化率则提升了5.7倍。与纯水相比，3.4% NaCl溶液中CO

水合物生成量无明显变化。复配溶液（3.4% NaCl + 1% L-甲硫氨酸）中，L-甲硫氨酸促进效果减弱，CO

水合物生长速率变慢，生成量减少，但仍优于3.4% NaCl溶液。形态学实验结果表明，纯水中CO

水合物膜覆盖时间最短（5.33 s），复配溶液中CO

水合物膜覆盖时间最长（14.33 s），添加L-甲硫氨酸可以改变水合物的宏观形貌，使水合物变得疏松多孔。

Abstract

Injecting carbon dioxide (CO

) into seabed sediment layers to form CO

hydrates is an effective method of carbon sequestration. However

this approach faces challenges such as long induction times and slow growth rates of hydrate formation. Using quartz sand as the porous medium

the effects of quartz sand grain size

initial water saturation and additives on the kinetics of CO

hydrate growth and the evolution of its macroscopic morphology were studied under isothermal and isochoric conditions at the experimental temperature of 273.65 K and the initial pressure of 3.5 MPa. The study results indicate that in a 3.4% NaCl solution (percentage is by mass

same below)

with an initial water saturation of 75%

when the quartz sand grain size is 26 mesh to 40 mesh

the CO

hydrate growth rate is the fastest

and the formation amount is the highest. And the final gas consumption is 0.0285 mol

with a water conversion rate of 7.27%. With a quartz sand grain size of 10 mesh to 18 mesh

when the initial water saturation is 50%

the CO

hydrate formation amount is the highest

with a final gas consumption of 0.0384 mol and water conversion and conversion amount of 17.17% and 4.29 g

respectively. In a 1% L-methionine solution

the CO

hydrate growth rate accelerates

and the formation amount increases significantly

with a final gas consumption 3.6 times higher than in pure water and the conversion rate of water increases by 5.7 times. Compared to pure water

the CO

hydrate formation amount in the 3.4% NaCl solution does not show significant changes. In the mixed solution (3.4% NaCl + 1% L-methionine)

the promoting effect of L-methionine is weakened

resulting in a slower CO

hydrate growth rate and a reduced formation amount

though still better than in the 3.4% NaCl solution. Morphological experime

nts indicate that the CO

hydrate film coverage time is the shortest in pure water (5.33 s) and the longest in the mixed solution (14.33 s). Adding L-methionine can alter the macroscopic morphology of the hydrates

making them loose and porous.

关键词

海洋碳封存CO2水合物生长速率L-甲硫氨酸宏观形貌

Keywords

marine carbon sequestrationCO2 hydratesgrowth rateL-methioninemacroscopic morphologies

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Related Author

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Related Institution

State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology

Laboratory for Marine Mineral Resources, Laoshan Laboratory

Key Laboratory of Gas Hydrate, Ministry of Natural Resources, Qingdao Institute of Marine Geology

College of Chemistry and Chemical Engineering, Southwest Petroleum University

China National Offshore Oil Corporation (Tianjin) Oilfield Chemical Co.,Ltd.

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Experimental study on growth characteristics of CO2 hydrates in quartz sand

DOI：10.12434/j.issn.2097-2547.20240052

摘要

Abstract

关键词

Keywords

references

Experimental study on growth characteristics of CO₂ hydrates in quartz sand