Experimental Investigation into the Combustion Characteristics of Propane Hydrates in Porous Media

Energies

Xiang-Ru Chen¹  Xiao-Sen Li¹  Zhao-Yang Chen¹  Yu Zhang¹  Ke-Feng Yan¹  Qiu-Nan Lv¹ 

[1] Key Laboratory of Gas Hydrate, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China; E-Mails:

关键词: propane hydrates;    combustion;    porous media;    flame propagation;   

DOI  :  10.3390/en8021242

来源: mdpi

【 摘 要 】

The combustion characteristics of both pure propane hydrates and the mixtures of hydrates and quartz sands were investigated by combustion experiments. The flame propagation, flame appearance, burning time and temperature in different hydrate layers were studied. For pure propane hydrate combustion, the initial flame falls in the “premixed” category. The flame propagates very rapidly, mainly as a result of burnt gas expansion. The flame finally self-extinguishes with some proportion of hydrates remaining unburned. For the hydrate-sand mixture combustion, the flame takes the form of many tiny discontinuous flames appearing and disappearing at different locations. The burn lasts for a much shorter amount of time than pure hydrate combustion. High porosity and high hydrate saturation is beneficial to the combustion. The hydrate combustion is the combustion of propane gas resulting from the dissociation of the hydrates. In both combustion test scenarios, the hydrate-dissociated water plays a key role in the fire extinction, because it is the main resistance that restrains the heat transfer from the flame to the hydrates and that prevents the hydrate-dissociated gas from releasing into the combustion zone.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.