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过程工程学报 ›› 2019, Vol. 19 ›› Issue (1): 216-222.DOI: 10.12034/j.issn.1009-606X.218118

• 环境与能源 • 上一篇    

初始压力对冰冻石英砂中CO2水合物生成特性的影响

李金平1,2,3,4*, 李 洋1,2,3,4, 姚 泽1,2,3,4, 张学民1,2,3,4, 黄娟娟1,2,3, 康 健1,2,3   

  1. 1. 兰州理工大学西部能源与环境研究中心,甘肃兰州 730050 2. 西北低碳城镇支撑技术协同创新中心,甘肃 兰州 730050 3. 甘肃省生物质能与太阳能互补供能系统重点试验室,甘肃 兰州730050 4. 兰州理工大学能源与动力工程学院,甘肃 兰州 730050
  • 收稿日期:2018-01-22 修回日期:2018-04-17 出版日期:2019-02-22 发布日期:2019-02-12
  • 通讯作者: 李金平
  • 基金资助:
    国家自然科学基金;甘肃省自然科学基金;中科院天然气水合物重点实验室开放基金

Influence of the initial pressure on formation characteristics of CO2 hydrate in quartz sand below freezing point

Jinping LI1,2,3,4*, Yang LI1,2,3,4, Ze YAO1,2,3,4, Xuemin ZHANG1,2,3,4, Juanjuan HUANG1,2,3,4, Jian KANG1,2,3   

  1. 1. Western China Energy and Environment Research Center, Lanzhou University of Technology, Lanzhou, Gansu 730050, China 2. China Northwestern Collaborative Innovation Center of Low-carbon Urbanization Technologies, Lanzhou, Gansu 730050, China 3. Key Laboratory of Energy Supply System Drived by Biomass Energy and Solar Energy of Gansu Province, Lanzhou, Gansu 730050, China 4. College of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China
  • Received:2018-01-22 Revised:2018-04-17 Online:2019-02-22 Published:2019-02-12

摘要: 利用冰冻石英砂模拟冻土水合物的赋存条件,研究了压力对二氧化碳水合物生成特性的影响,在300 mL高压水合物反应釜中于271 K下进行了多组CO2液化压力以上及以下的霰状冰粉包裹的石英砂中水合物生成实验。结果表明,充入的CO2未液化时,初始压力越大,水合反应速率越快,压力越早达稳定状态;充入压力达液化压力后,注入的CO2越多,水合反应速率越快。压力作为水合反应的驱动力,压力越高水合物生成越多,冰的最终转化率越高。采用CO2置换冻土区中甲烷水合物时,控制压力低于液化压力或注入过量的CO2,置换效果更好。

关键词: 液化, 二氧化碳水合物, 冰冻石英砂, 生成特性, 转化率

Abstract: The permafrost region contains a large amount of natural gas hydrate resources. Carbon dioxide replaces methane to recover gas hydrates in the frozen soil, can not only obtain a large amount of natural gas resources, but also can save carbon dioxide gas and reduce the greenhouse effect caused by carbon dioxide emissions. It is a very promising gas hydrate extraction methods. At present, there are few studies on the carbon dioxide replacement of natural gas hydrates by methane production in the permafrost region, and the formation and decomposition characteristics of methane hydrate and carbon dioxide hydrate in the permafrost region have not yet been revealed. In this work, the occurrence condition of frozen quartz sands sleet shape to simulate permafrost gas hydrate, experimental study on effect of stress on carbon dioxide hydrate formation characteristics, several experimental groups were carried out respectively in 271 K, which the generated pressure of carbon dioxide above or below liquefaction pressure in 300 mL high pressure hydration reactor. The results showed that carbon dioxide below freezing temperatures in quartz sand pressure without liquefaction, the higher the initial pressure, the faster the hydration reaction rate and the earlier the pressure will reach the stable state. But above liquefaction pressure, the more the amount of carbon dioxide was filled, the faster the hydration reaction rate was. From the overall trend, the pressure acted as a driving force of the hydration reaction. The higher the pressure, the more formation of carbon dioxide hydrate was, and the higher the final conversion rate was. Therefore, when carbon dioxide was used to replace methane hydrate in the permafrost region, it was necessary to control the pressure below the liquefaction pressure or to inject excess carbon dioxide, and the final conversion rate will increase dramatically.

Key words: Liquefaction, CO2 hydrate, Frozen quartz sand, Formation characteristic, Conversion rate