Phase Transitions in Mixed Gas Hydrates:  Experimental Observations versus Calculated Data

2006 ◽  
Vol 110 (23) ◽  
pp. 11468-11474 ◽  
Author(s):  
Judith M. Schicks ◽  
Rudolf Naumann ◽  
Jörg Erzinger ◽  
Keith C. Hester ◽  
Carolyn A. Koh ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Gas Hydrates ◽  
Calculated Data ◽  
Mixed Gas

Mixed gas sources induced co-existence of sI and sII gas hydrates in the Qiongdongnan Basin, South China Sea

2021 ◽  
Vol 128 ◽  
pp. 105024
Author(s):  
Jiangong Wei ◽  
Tingting Wu ◽  
Linqi Zhu ◽  
Yunxin Fang ◽  
Jinqiang Liang ◽  
...  
Keyword(s):  
South China Sea ◽  
South China ◽  
Gas Hydrates ◽  
Qiongdongnan Basin ◽  
Mixed Gas ◽  
China Sea

PROSPECTS FOR OBTAINING GAS MOTOR FUEL FROM BIOGAS OF ANAEROBIC DIGESTION OF AGRICULTURAL WASTE

2021 ◽  
Vol 3 (144) ◽  
pp. 22-31
Author(s):  
Viktor S. Grigor’yev ◽  
◽  
Il’ya V. Romanov
Keyword(s):  
Anaerobic Digestion ◽  
Gas Hydrates ◽  
Process Model ◽  
Organic Waste ◽  
Agricultural Waste ◽  
Motor Fuel ◽  
Hydrate Formation ◽  
Research Purpose ◽  
Industrial Complex ◽  
Mixed Gas

The ability of gas hydrates to concentrate gas into a solid chelate structure and the properties of self-preservation of gas hydrates at negative temperatures allows us to consider the possibility of developing a method for the utilization of biogas, environmentally safe storage and transportation of biomethane. (Research purpose) The research purpose is in substantiation the technological possibilities of obtaining synthetic mixed gas hydrates of biogas components, their storage and transportation based on the analysis of the existing regularities of the formation of gas hydrates in time, temperature and external pressure. (Materials and methods) The article presents the accumulated results of studies of the process of obtaining artificial hydrates of natural gas and methane- containing gas mixtures at various initial static pressures and temperatures. The object of research to substantiate the parameters of artificial creation of gas hydrates is biogas obtained during anaerobic thermophilic fermentation of organic waste at an existing experimental biogas plant. Mixed feed SK-8 with a humidity of 90-92 percent was used as an organic substrate of constant composition. The composition of biogas was studied using the Optima-7 Biogas gas analyzer. (Results and discussion) The article presents a process model and a technical appearance of an installation for producing gas motor fuel from the biogas of anaerobic digestion of organic waste of the agro-industrial complex. The hydrate formation time depends on the increase in the interfacial surface and the movement of gas bubbles relative to the liquid, which can be regulated by acting on the hydrate formation zone (shock wave, electromagnetic, mechanical, chemical, temperature). (Conclusions) The research results can be used in modeling processes in two-phase media during the formation of gas hydrates and the creation of installations for their production.

Formation of Ice, Tetrahydrofuran Hydrate, and Methane/Propane Mixed Gas Hydrates in Strong Monovalent Salt Solutions

2014 ◽  
Vol 28 (11) ◽  
pp. 6877-6888 ◽  
Author(s):  
Barbara Sowa ◽  
Xue Hua Zhang ◽  
Patrick G. Hartley ◽  
Dave E. Dunstan ◽  
Karen A. Kozielski ◽  
...  
Keyword(s):  
Gas Hydrates ◽  
Salt Solutions ◽  
Mixed Gas ◽  
Monovalent Salt

Spectroscopic analysis of carbon dioxide and nitrogen mixed gas hydrates in silica gel for CO2 separation

2006 ◽  
Vol 115 (1-4) ◽  
pp. 279-282 ◽  
Author(s):  
Jeasung Park ◽  
Yu-Taek Seo ◽  
Jong-won Lee ◽  
Huen Lee
Keyword(s):  
Carbon Dioxide ◽  
Silica Gel ◽  
Gas Hydrates ◽  
Spectroscopic Analysis ◽  
Co2 Separation ◽  
Mixed Gas

scholarly journals Gas Hydrate Combustion in Five Method of Combustion Organization

Entropy ◽  
2020 ◽  
Vol 22 (7) ◽  
pp. 710
Author(s):  
Sergey Y. Misyura ◽  
Andrey Yu. Manakov ◽  
Galina S. Nyashina ◽  
Olga S. Gaidukova ◽  
Vladimir S. Morozov ◽  
...  
Keyword(s):  
Gas Hydrates ◽  
Gas Hydrate ◽  
Thick Layer ◽  
Combustion Products ◽  
Dissociation Rate ◽  
Powder Layer ◽  
Muffle Furnace ◽  
Mixed Gas ◽  
Harmful Emissions ◽  
Burning Coal

Experiments on the dissociation of a mixed gas hydrate in various combustion methods are performed. The simultaneous influence of two determining parameters (the powder layer thickness and the external air velocity) on the efficiency of dissociation is studied. It has been shown that for the mixed hydrate, the dissociation rate under induction heating is 10–15 times higher than during the burning of a thick layer of powder, when the combustion is realized above the layer surface. The minimum temperature required for the initiation of combustion for different combustion methods was studied. As the height of the sample layer increases, the rate of dissociation decreases. The emissions of NOx and CO for the composite hydrate are higher than for methane hydrate at the same temperature in a muffle furnace. A comparison of harmful emissions during the combustion of gas hydrates with various types of coal fuels is presented. NOx concentration as a result of the combustion of gas hydrates is tens of times lower than when burning coal fuels. Increasing the temperature in the muffle furnace reduces the concentration of combustion products of gas hydrates.

scholarly journals The complex oxides with octahedral structures: Existence areas and phase transitions

2020 ◽  
Vol 10 (01n02) ◽  
pp. 2060013 ◽  
Author(s):  
G. A. Geguzina
Keyword(s):  
Phase Transitions ◽  
Solid State ◽  
Calculated Data ◽  
Complex Oxides ◽  
Interatomic Bond ◽  
The Other ◽  
Layered Perovskite ◽  
Geometric Models ◽  
Antiferroelectric Phase ◽  
The One

The experimental and calculated data on the existence of complex oxides in solid state with the octahedral structures of four families, namely perovskites, Bi-containing layered perovskite-like ones, tetragonal tungsten bronzes and pyrochlores, and about their phase transitions are systematized and summarized on the basis of the quasi-elastic or geometric models of these structures. It has been established that similar existence areas and similar correlations between the interatomic bond strains in their structures, on the one hand, and the temperatures of their ferroelectric or antiferroelectric phase transitions, on the other hand, are observed for all of them, despite the differences in the compositions and structures of these oxides, but taking into account their similar parameters.

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