A CFD study on the effect of carbon particle seeding for the improvement of solar reactor performance

Nesrin Ozalp, Anoop Baby

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

With the increasing concern of CO2 emissions and climate change, efforts have grown to include solar technologies in chemical processes to manufacture products that can be used both as a commodity and as a fuel, such as hydrogen. This study focuses on a technique, referred to as "solar cracking" of natural gas for the co-production of hydrogen and carbon as byproduct with zero emission footprint via the following reaction: CH 4→C(s)+2H2(g). However, some portion of the incoming solar energy absorbed by the cavity greatly exceeds the surface absorption of the inner walls because of multiple internal reflections. Studies have shown that by seeding the reactor with micron-sized carbon particles, methane conversion improves drastically due to the radiation absorbed by the carbon particles and additional nucleation sites formed by carbon particles for heterogeneous decomposition reaction. This can maintain more heat at the core and can reduce the carbon deposits on the reactor walls. Present study numerically tries to investigate the above fact by tracking carbon particles in a Lagrangian frame-work. Initially, the numerical model is validated qualitatively by comparing the particle deposition on reactor window with the experimental observations. Effect of particle loading, particle emissivity, injection point location, and effect of using different window screening gases on a flow and temperature distribution inside a confined tornado flow reactor are studied. It is observed that the methane conversion substantially increases by particle seeding. The results of this research can be used in thermo-chemical reactor design.

Original languageEnglish
Title of host publicationASME 2010 4th International Conference on Energy Sustainability, ES 2010
Pages143-152
Number of pages10
Volume2
DOIs
Publication statusPublished - 2010
EventASME 2010 4th International Conference on Energy Sustainability, ES 2010 - Phoenix, AZ, United States
Duration: 17 May 201022 May 2010

Other

OtherASME 2010 4th International Conference on Energy Sustainability, ES 2010
CountryUnited States
CityPhoenix, AZ
Period17/5/1022/5/10

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Keywords

  • Carbon seeding
  • Computational flow dynamics
  • Hydrogen
  • Solar cracking
  • Solar reactor

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Renewable Energy, Sustainability and the Environment

Cite this

Ozalp, N., & Baby, A. (2010). A CFD study on the effect of carbon particle seeding for the improvement of solar reactor performance. In ASME 2010 4th International Conference on Energy Sustainability, ES 2010 (Vol. 2, pp. 143-152) https://doi.org/10.1115/ES2010-90326