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Proceedings of the 25th National and 3rd International ISHMT-ASTFE Heat and Mass Transfer Conference (IHMTC-2019)

ISBN Druckformat: 978-1-56700-497-7 (Flash Drive)
ISBN Online: 978-1-56700-496-0

Methane Hydrate Dissociation in Porous Media using Multistep Depressurization: An Experimental Study

DOI: 10.1615/IHMTC-2019.370
pages 217-220

Randeep Ravesh
Department of Mechanical Engineering, IIT Kanpur, 208016, India

Ayaj Ahamad Ansari
Department of Mechanical Engineering, IIT Kanpur, 208016, India

Sabyasachi Mohapatra
Department of Mechanical Engineering, IIT Kanpur, 208016, India

Pradipta K. Panigrahi
Department of Mechanical Engineering, IIT Kanpur, Kanpur, India, 208016

Malay K Das
Department of Mechanical Engineering, IIT Kanpur

Abstrakt

This work deals with formation and dissociation of methane hydrates in porous media in a cylindrical reactor. Recovery of Methane from Methane hydrate involves various techniques that leads to destabilisation of hydrate. Single step depressurization is extensively used in laboratory experiments to recover gas. Here, multi-step depressurization technique is used to dissociate hydrate. A 25 L reactor is designed and fabricated to facilitate the formation and dissociation of gas hydrates. Temperature and pressure variation is used to understand the transport process during experiment. Hydrate formation and dissociation processes are exothermic and endothermic respectively which motivated to place the temperature sensors at radial and axial locations. It is observed during hydrate formation that the temperature spikes occur at different time intervals, indicated that nucleation sites are distributed randomly throughout the reactor and the formation happens in the reactor at different locations. Further, it is concluded that multistep depressurization can enhance gas recovery compared to single step depressurization. However, if interval between depressurization pressures is shortened, it may enhance hydrate regeneration because of the hydrate dissociation is endothermic.