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2017 CO2-Free Hydrogen Production from Methane using Concentrated Solar Energy

Hydrogen can be produced by many processes, by a series of chemical reactions, many of which have been known for centuries. However, most of these reactions raise severe environmental and safety problems. The analysis of Hydrogen production without CO2 emissions is one of the most challenging activities that have been initiated for a sustainable energy supply. As one of the tracks to fulfil such objective, direct methane cracking has been proposed. In this context comes this numerical simulation of the methane cracking phenomenon. The cracking phenomena of the methane into hydrogen and carbon black takes place in a cylindrical cavity of 16 cm in diameter and 40 cm in length under the heat of concentrated solar radiation without any catalyst. The low Reynolds K - ε turbulence model was applied. A time step of 0.04s has been used. A commercial calculation code "ANSYS FLUENT" is used to simulate the cracking phenomena. The effect of temperature, methane flow rate and residence time has been analysed. From the view point of solar energy two cases were studied: the first one applying a maximum solar radiation of 16MW/m2 on the side wall of the reactor and the second one applying a maximum solar radiation of 5 MW/m2. The CH4 flow rates used at the inlet of the reactor are 0.10, 0.30, 0.58, 0.60, 0.62, 0.76, 0.94 and 1.25L/min. From the view point of phase numbers three cases with were considered: first, the mixture is considered to be biphasic formed by a gaseous phase with methane, hydrogen gases and carbon black powder solid phase, this powder is formed by solid particles with same diameter (d=50nm); the second case is a mixture of 3 phases, i.e. a carbon powder of 2 different diameters plus a gas phase; the third case is a mixture of 5 phases, i.e. a carbon powder of 4 different diameters plus a gas phase.

1.st International Conference Energy Systems Engineering
ıcese'17

Rabah Gomri Belkacem Nezzari

94 89
Subject Area: Engineering Broadcast Area: International Type: Oral Paper Language: English