化工进展 ›› 2018, Vol. 37 ›› Issue (02): 546-553.DOI: 10.16085/j.issn.1000-6613.2017-0869

• 能源加工与技术 • 上一篇    下一篇

凹凸棒石体系下CO2水合物生成动力学实验

俞冬梅1, 陈硕1, 王树立1,2, 饶永超1, 吕晓方1   

  1. 1 常州大学石油工程学院, 江苏 常州 213016;
    2 江苏省油气储运技术重点实验室, 江苏 常州 213016
  • 收稿日期:2017-05-09 修回日期:2017-06-01 出版日期:2018-02-05 发布日期:2018-02-05
  • 通讯作者: 王树立,教授,研究方向为气体水合物理论与应用等。
  • 作者简介:俞冬梅(1993-),女,硕士研究生。E-mail:betterydm@126.com。
  • 基金资助:
    国家自然科学基金(51574045)、江苏省研究生培养创新工程(KYZZ16_0249)及常州市科技计划(CJ20160041)项目。

Experiment on attapulgite for CO2 hydrate formation kinetics

YU Dongmei1, CHEN Shuo1, WANG Shuli1,2, RAO Yongchao1, LÜ Xiaofang1   

  1. 1 School of Petroleum Engineering, Changzhou University, Changzhou 213016, Jiangsu, China;
    2 Jiangsu Key Laboratory of Oil-Gas Storage and Transportation Technology, Changzhou 213016, Jiangsu, China
  • Received:2017-05-09 Revised:2017-06-01 Online:2018-02-05 Published:2018-02-05

摘要: 油气生产、储运及CO2管道输送的过程中易生成CO2水合物,添加抑制剂是预防CO2水合物生成的有效手段。为解决CO2水合物堵塞问题,本文采用超声波处理后的凹凸棒石作为抑制剂,利用可视化高压反应釜实验装置,在初始条件3 MPa和2℃下,研究了添加浓度为0、0.05mg/mL、0.30mg/mL、0.50mg/mL、0.75mg/mL、1.00mg/mL和1.50 mg/mL的凹凸棒石对CO2水合物生成动力学的影响。用压力变化法测定了水合物生成诱导时间,用动力学模型计算了水合物生成量,并分析了凹凸棒石影响CO2水合物生成的微观机理。实验结果表明凹凸棒石能延长CO2水合物生成诱导时间,浓度为0.75mg/mL时作用效果最佳,较纯水体系CO2水合物生成诱导时间延长了200%;凹凸棒石能减少CO2水合物的生成量,浓度为1.5mg/mL时作用效果最佳,与纯水体系相比减少了12.8%。凹凸棒石抑制水合物生成的微观机理主要是由于其独特的选择吸附性以及对传质传热的阻碍。研究表明以凹凸棒石作为CO2水合物抑制剂效果良好,能有效延长其诱导时间,兼具经济性和环境友好的特点。

关键词: 凹凸棒石, CO2水合物, 抑制生成, 微观机理

Abstract: CO2 hydrate is often formed in oil and gas production, storage and transportation, and CO2 transporting via pipelines. The most effective method to prevent CO2 hydrate is to add inhibitor. To solve the problem of CO2 hydrate blockage, the effects of ultrasonic processing attapulgite, as a hydrate inhibitor,(mass concentration of 0, 0.05mg/mL, 0.30mg/mL, 0.50mg/mL, 0.75mg/mL, 1.00mg/mL and 1.50mg/mL) on the kinetics of CO2 hydrate formation were investigated by using the high-pressure reactor. The experiments were conducted at temperatures 2℃ and initial cell pressures 3MPa. The impacts of various concentrations of attapulgite on CO2 hydrate formation were studied. The induction time and the generated quantity were measured by changing pressure. The production of hydrate was calculated by the kinetic model. Furthermore, the microscopic mechanism of inhibiting hydrate formation was analyzed. The results showed that the suspension of attapulgite had significant effect on inhibiting the formation of hydrate. The optimal concentration is 0.75mg/mL. Compared with the formation experiment of CO2 hydrate in deionized water, the induction time increased by 200%; the hydrate formation would be reduced in the attapulgite system, which can be decreased by 12.8% at the optimal concentration of 1.5mg/mL. The inhibition mechanism of attapulgite is mainly due to its selective adsorption and blocking mass and heat transfer. Therefore, the attapulgite, as a new CO2 hydrate inhibitor, has a good inhibitory effect as well as economy and environmental friendly.

Key words: attapulgite, CO2 hydrate, inhibit formation, microscopic mechanism

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