摘要：Porous hydrogel particles of poly(2-hydroxyethyl methacrylate) (PHEMA) and poly(N-isopropylacrylamide) (PNIPAAm) with varying water absorbability and quantities were investigated upon their ability and stability to support the reversible methane hydrates storage in the presence of silica nanoparticles and water. Results from experimental and computational simulation indicated that the equilibrium water content and types of hydrogels, and the quantity of the hydrogel particles used in the mixture affect the hydrate formation kinetics. At the experimental condition of 4.5 MPa, all types of porous hydrogel particles were proved to be effective to store methane in the hydrates form. A storage capacity of 206 cm(3) methane gas (as at standard temperature and pressure) per gram water was achieved when the hydrate forming mixture contained four parts of PHEMA20, one part of silica nanoparticles and fifteen parts of water. Quantitative analysis using the shrinking-core model indicated that the presence of the hydrogel particles could increase the overall methane diffusivity and improve the hydrate formation kinetics, therefore the overall water conversion rate also enhanced. A strong reversibility was demonstrated by the added porous hydrogel particles. Changing water uptake by the hydrogel particles during the cool-thawing procedure was evident by the simulated water distribution data. The hydrogels with higher equilibrium water content, greater pore volumes and more stable porous structures and the lower operational pressure have shown better methane storage capacity and reversibility. (C) 2017 Elsevier Ltd. All rights reserved.

关键字：Methane hydrates formation Hydrogel particles Dry-water droplets Reversible methane storage Shrinking-core model Equilibrium water content

ISSN号：0016-2361

卷、期、页：卷: 194 页: 395-405

发表日期：2017-04-15

影响因子：0.000000

收录情况：SCI（科学引文索引印刷版）,ESI（基本科学指标数据库）,EI（工程索引）,SCIE（科学引文索引网络版）

发表期刊名称：Fuel

参与作者：杨亮,樊栓狮,娄峡

第一作者：史博会

论文类型：期刊论文

论文概要：史博会,杨亮,樊栓狮,娄峡，An investigation on repeated methane hydrates formation in porous hydrogel particles，Fuel，2017，卷: 194 页: 395-405

论文题目：An investigation on repeated methane hydrates formation in porous hydrogel particles