Effect of Residual Water in Sediments on the CO<sub>2</sub>-CH<sub>4</sub> Replacement Process
CO<sub>2</sub> replacement is a promising method of gas hydrate recovery. However, the influence of residual water in the replacement process and selections of a suitable mining area remain uncertain. To better understand this method, we examined the influence of the particle size and in...
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MDPI AG
2023-03-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/16/7/3154 |
| _version_ | 1797608008601042944 |
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| author | Fuqin Lu Xuebing Zhou Caili Huang Dongliang Li Deqing Liang |
| author_facet | Fuqin Lu Xuebing Zhou Caili Huang Dongliang Li Deqing Liang |
| author_sort | Fuqin Lu |
| collection | DOAJ |
| description | CO<sub>2</sub> replacement is a promising method of gas hydrate recovery. However, the influence of residual water in the replacement process and selections of a suitable mining area remain uncertain. To better understand this method, we examined the influence of the particle size and initial hydrate saturation on the replacement process while using the same amount of residual free water. The results showed that during the replacement process, two stages of rapid reaction and slow reaction occurred, which were manifested by the speed of pressure change in the reactor. The CO<sub>2</sub> sequestration ratio decreased with the increase in sediment particle size and increased with the increase in initial hydrate saturation. During the replacement process, two reactions occurred: CH<sub>4</sub> was replaced by CO<sub>2</sub> and CO<sub>2</sub> hydrate was formed, and the replacement amount and recovery efficiency of CH<sub>4</sub> increased with a decrease in sediment particle size. When the sediment particle size was less than 166 μm, the CH<sub>4</sub> recovery efficiency was significantly affected by the particle size. The replacement amount of CH<sub>4</sub> increased with the increase in initial hydrate saturation, and the recovery efficiency decreased. This study provides a basis for selecting suitable hydrate-accumulation areas for on-site mining. |
| first_indexed | 2024-03-11T05:37:38Z |
| format | Article |
| id | doaj.art-3fb8976fb5994bb98bd273ce2b903d38 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-11T05:37:38Z |
| publishDate | 2023-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-3fb8976fb5994bb98bd273ce2b903d382023-11-17T16:38:10ZengMDPI AGEnergies1996-10732023-03-01167315410.3390/en16073154Effect of Residual Water in Sediments on the CO<sub>2</sub>-CH<sub>4</sub> Replacement ProcessFuqin Lu0Xuebing Zhou1Caili Huang2Dongliang Li3Deqing Liang4Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, ChinaGuangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, ChinaGuangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, ChinaGuangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, ChinaGuangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, ChinaCO<sub>2</sub> replacement is a promising method of gas hydrate recovery. However, the influence of residual water in the replacement process and selections of a suitable mining area remain uncertain. To better understand this method, we examined the influence of the particle size and initial hydrate saturation on the replacement process while using the same amount of residual free water. The results showed that during the replacement process, two stages of rapid reaction and slow reaction occurred, which were manifested by the speed of pressure change in the reactor. The CO<sub>2</sub> sequestration ratio decreased with the increase in sediment particle size and increased with the increase in initial hydrate saturation. During the replacement process, two reactions occurred: CH<sub>4</sub> was replaced by CO<sub>2</sub> and CO<sub>2</sub> hydrate was formed, and the replacement amount and recovery efficiency of CH<sub>4</sub> increased with a decrease in sediment particle size. When the sediment particle size was less than 166 μm, the CH<sub>4</sub> recovery efficiency was significantly affected by the particle size. The replacement amount of CH<sub>4</sub> increased with the increase in initial hydrate saturation, and the recovery efficiency decreased. This study provides a basis for selecting suitable hydrate-accumulation areas for on-site mining.https://www.mdpi.com/1996-1073/16/7/3154methane hydrateCO<sub>2</sub> replacementresidual watersediment particle sizeinitial hydrate saturationCH<sub>4</sub> recovery efficiency |
| spellingShingle | Fuqin Lu Xuebing Zhou Caili Huang Dongliang Li Deqing Liang Effect of Residual Water in Sediments on the CO<sub>2</sub>-CH<sub>4</sub> Replacement Process Energies methane hydrate CO<sub>2</sub> replacement residual water sediment particle size initial hydrate saturation CH<sub>4</sub> recovery efficiency |
| title | Effect of Residual Water in Sediments on the CO<sub>2</sub>-CH<sub>4</sub> Replacement Process |
| title_full | Effect of Residual Water in Sediments on the CO<sub>2</sub>-CH<sub>4</sub> Replacement Process |
| title_fullStr | Effect of Residual Water in Sediments on the CO<sub>2</sub>-CH<sub>4</sub> Replacement Process |
| title_full_unstemmed | Effect of Residual Water in Sediments on the CO<sub>2</sub>-CH<sub>4</sub> Replacement Process |
| title_short | Effect of Residual Water in Sediments on the CO<sub>2</sub>-CH<sub>4</sub> Replacement Process |
| title_sort | effect of residual water in sediments on the co sub 2 sub ch sub 4 sub replacement process |
| topic | methane hydrate CO<sub>2</sub> replacement residual water sediment particle size initial hydrate saturation CH<sub>4</sub> recovery efficiency |
| url | https://www.mdpi.com/1996-1073/16/7/3154 |
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