Energy Conversion and Management | VOL. 136
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Flue gas injection into gas hydrate reservoirs for methane recovery and carbon dioxide sequestration

Publication Date Mar 1, 2017

Abstract

Abstract Flue gas injection into methane hydrate-bearing sediments was experimentally investigated to explore the potential both for methane recovery from gas hydrate reservoirs and for direct capture and sequestration of carbon dioxide from flue gas as carbon dioxide hydrate. A simulated flue gas from coal-fired power plants composed of 14.6 mol% carbon dioxide and 85.4 mol% nitrogen was injected into a silica sand pack containing different saturations of methane hydrate. The experiments were conducted at typical gas hydrate reservoir conditions from 273.3 to 284.2 K and from 4.2 to 13.8 MPa. Results of the experiments show that injection of the flue gas leads to significant dissociation of the methane hydrate by shifting the methane hydrate stability zone, resulting in around 50 mol% methane in the vapour phase at the experimental conditions. Further depressurisation of the system to pressures well above the methane hydrate dissociation pressure generated methane-rich gas mixtures with up to 80 mol% methane. Meanwhile, carbon dioxide hydrate and carbon dioxide-mixed hydrates were formed while the methane hydrate was dissociating. Up to 70% of the carbon dioxide in the flue gas was converted into hydrates and retained in the silica sand pack.

Concepts
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Flue Gas Injection
Gas Hydrate Reservoirs
Carbon Dioxide Hydrate
Methane Hydrate
Flue Gas
Methane Hydrate-bearing Sediments
Carbon Dioxide
Carbon Dioxide Sequestration
Simulated Flue Gas
Reservoirs For Sequestration

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