Multi-cycle methane hydrate formation in micro droplets of gelatinous dry solution

作     者：Yang, Liang Lan, Xin Liu, Daoping Cui, Guomin Dou, Binlin Wang, Juan 

作者机构：Univ Shanghai Sci & Technol Sch Energy & Power Engn Shanghai Key Lab Multiphase Flow & Heat Transfer Shanghai 200093 Peoples R China Shanghai Univ Elect Power Sch Environm & Chem Engn Shanghai 200090 Peoples R China China Univ Min & Technol Natl Engn Res Ctr Coal Preparat & Purificat Xuzhou 221116 Jiangsu Peoples R China 

出 版 物：《CHEMICAL ENGINEERING JOURNAL》 (化学工程杂志)

年 卷 期：2019年第374卷

页      面：802-810页

核心收录：

学科分类：0830[工学-环境科学与工程（可授工学、理学、农学学位）] 0817[工学-化学工程与技术] 08[工学] 

基　　金：National Natural Science Foundation of China [51606125, 51802190, 51674240, 51176125] Open Fund of National Engineering Research Center of Coal Preparation and Purification [2018NERCCPP-B05] Innovation Program of Shanghai Municipal Education Commission [13ZZ117] 

主　　题：Methane hydrate Repeated formation Kinetic behavior Gelatinous dry solution Micro droplets 

摘      要：A gelatinous dry solution (GDS) was prepared by blending sodium dodecyl sulfate solution, gellan gum powder, and hydrophobic silica nanoparticles in air at a high speed. It is essentially a pile of free-flowing micro surfactant droplets supported by a gelling agent. The GDS has the dispersion characteristics of dry water, activity of the surfactant solution and stability of the gel. The flour-like droplets can provide abundant micro channels for gas transfer, a considerable surface area for gas-liquid contact and stable gel-like structure for repeated hydrate formation. Multi-cycle methane consumption experiments were conducted in a stainless steel vessel at 5.0-8.1 MPa and 273.2 K, in order to study the repeated kinetics of methane hydrate formation in GDS. The results demonstrated that the dispersed GDS facilitated rapid and reversible methane storage in clathrate hydrate by enhancing the gas-liquid contact and the stability of the regular droplets. Methane uptake (152.2-163.2 m(3).m(-3)) and maximum uptake rates (4.522-5.690 m(3).m(-3).min(-1)) were achieved in the first storage cycle at the experimental pressures. GDS maintained relatively high methane storage capacities (114.3-118.0 m(3).m(-3)) until the ninth cycle, and the capacities only were attenuated by 24.92-27.70% with respect to the first cycle at the above pressures. A hypothesis of droplets breakage by released gas was proposed to illustrate the attenuation of gas storage capacity of the droplets.