期刊
CHEMICAL ENGINEERING JOURNAL
卷 374, 期 -, 页码 802-810出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2019.05.219
关键词
Methane hydrate; Repeated formation; Kinetic behavior; Gelatinous dry solution; Micro droplets
资金
- 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]
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.
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