Rapid solar-thermal dissociation of natural gas in an aerosol flow reactor

Jaimee K Dahl, Karen J Buechler, Ryan Finley, Timothy Stanislaus, Alan W Weimer, Allan Lewandowski, Carl Bingham, Alexander Smeets and Adrian Schneider

Energy, 2004, vol. 29, issue 5, 715-725

Abstract: A solar-thermal aerosol flow reactor process is being developed to dissociate natural gas (NG) to hy drogen (H2) and carbon black at high rates. Concentrated sunlight approaching 10 kW heats a 9.4 cm long×2.4 cm diameter graphite reaction tube to temperatures ~2000 K using a 74% theoretically efficient secondary concentrator. Pure methane feed has been dissociated to 70% for residence times less than 0.1 s. The resulting carbon black is 20–40 nm in size, amorphous, and pure. A 5 million (M) kg/yr carbon black/1.67 M kg/yr H2 plant is considered for process scale-up. The total permanent investment (TPI) of this plant is $12.7 M. A 15% IRR after tax is achieved when the carbon black is sold for $0.66/kg and the H2 for $13.80/GJ. This plant could supply 0.06% of the world carbon black market. For this scenario, the solar-thermal process avoids 277 MJ fossil fuel and 13.9 kg-equivalent CO2/kg H2 produced as compared to conventional steam-methane reforming and furnace black processing.

Date: 2004
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:29:y:2004:i:5:p:715-725

DOI: 10.1016/S0360-5442(03)00179-8

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