气水体系甲烷水合物生成和分解动力学

doi:10.16085/j.issn.1000-6613.2019-1641

化工进展 ›› 2020, Vol. 39 ›› Issue (8): 2954-2961.DOI: 10.16085/j.issn.1000-6613.2019-1641

气水体系甲烷水合物生成和分解动力学

黄婷¹^,²(), 李长俊³, 丁麟⁴, 李清平¹^,²

^1.中海油研究总院有限责任公司，北京 100028
^2.天然气水合物国家重点实验室，北京 100028
^3.西南石油大学石油与天然气工程学院，四川成都 610500
^4.中国石油勘探开发研究院，北京 100083
^5.西澳大学机械与化学工程学院，澳大利亚珀斯 6009

出版日期:2020-08-01 发布日期:2020-08-12
通讯作者: 黄婷
作者简介:黄婷（1991—），女，博士，研究方向为天然气水合物流动安全保障及海洋天然气水合物开采数值模拟。E-mail：huangting7@cnooc.com.cn。
基金资助:
国家自然科学基金(51474184);国家重点研发计划(2016YFC0.04000);中海石油（中国）有限公司科技课题(2019-KJYFPT-002)

Study on methane hydrate formation and decomposition characteristics in gas-water system

Ting HUANG¹^,²(), Changjun LI³, Ling DING⁴, Qingping LI¹^,², M Aman ZACHARY⁵

^1.CNOOC Research Institute Company Limited, Beijing 100028, China
^2.State Key Laboratory of Natural Gas Hydrate, Beijing 100028, China
^3.School of Petroleum and Natural Gas Engineering, Southwest Petroleum University, Chengdu 610500, Sichuan, China
^4.PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China
^5.School of Mechanical and Chemical Engineering, The University of Western Australia, Perth 6009, WA, Australia

Online:2020-08-01 Published:2020-08-12
Contact: Ting HUANG

摘要/Abstract

摘要：

为进一步探明搅拌对甲烷水合物生成和分解动力学特性的影响，借助容积约为522mL，最高操作压力21MPa的高压全透明反应釜装置，开展了不同搅拌条件下甲烷水合物的生成、分解和浆液流动实验，得到了搅拌对水合物生成量、生长速率和分解速率的影响规律，基于搅拌电机扭矩值分析了不同搅拌速率下水合物浆液的流动特性。搅拌电机型号ViscoPakt Rheo-57，带有扭矩测量功能，测量最大范围57N·cm，精度±0.04N·cm。结果表明：在水合物开始快速生成的前期，水合物的最大生成量、最大生长速率及平稳生长速率都随搅拌速率的增大而增大，进一步验证了传质是控制水合物生成过程的首要因素；在水合物分解阶段，搅拌能提高水合物颗粒的分散性，促进分解气的运移产出；此外，不同搅拌速率下，水合物浆液的电机扭矩随着水合物体积分数的增大都呈现先保持平稳再逐渐增大最后剧烈波动的规律，由此得到了水合物浆液携带固相颗粒的临界体积分数。研究结论在一定程度上揭示了水合物的生长和分解机理，为动力学预测模型研究提供了参考。

关键词: 水合物, 动力学, 搅拌, 流动特性, 甲烷

Abstract:

In order to further find out the effect of stirring on the methane hydrate formation and decomposition characteristics, a series of methane hydrate kinetically experiments under different stirring conditions was conducted by means of a transparent high-pressure autoclave. This autoclave had a volume of 522mL with the highest operating pressure of 21MPa. Several aspects were obtained including the function of stirring on the amount of total hydrate volume, the hydrate growth and decomposition rate, as well as the hydrate slurry flow property under different stirring rate based on the measured motor torque. The type of the stirring motor was ViscoPakt Rheo-57 which had the function of measuring stirring torque. The range of acceptable torque was 0~57N·cm with an accuracy of ±0.04N·cm. The experimental results indicated mainly three pieces of information. Firstly, the maximum amount of hydrate volume, the biggest and the stable hydrate growth rates increased with increasing stirring rate during the hydrate fast growth period. It was further verified that mass transfer was the primary factor controlling the hydrate formation process. Secondly, in the hydrate decomposition period, stirring can improve the dispersivity of hydrate particles and promote the transport of decomposition gas. Lastly, the motor torque of hydrate slurry presented a first stable and then increasing and final drastic fluctuation feature along with the increase of stirring rate. As a result, the critical volume fraction of solid hydrate particles that the hydrate slurry can carry was defined. The conclusions of this study can uncover the mechanisms of hydrate formation and decomposition to some degree and also provide a reference for the research of kinetic prediction models.

Key words: gas hydrate, kinetics, stirring, flow property, methane

中图分类号:

黄婷, 李长俊, 丁麟, 李清平. 气水体系甲烷水合物生成和分解动力学[J]. 化工进展, 2020, 39(8): 2954-2961.

Ting HUANG, Changjun LI, Ling DING, Qingping LI, M Aman ZACHARY. Study on methane hydrate formation and decomposition characteristics in gas-water system[J]. Chemical Industry and Engineering Progress, 2020, 39(8): 2954-2961.

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气水体系甲烷水合物生成和分解动力学

Study on methane hydrate formation and decomposition characteristics in gas-water system

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