Heat and mass transfer model of a packed-bed reactor for solar thermochemical CO2 capture

Leanne Reich, Roman Bader, Terrence W. Simon, Wojciech Lipiński

Research output: Contribution to conferencePaperpeer-review

7 Scopus citations

Abstract

A 1 kWth dual-cavity solar thermochemical reactor concept is proposed to capture carbon dioxide via the calcium oxide based calcination-carbonation cycle. The reactor is oriented beam-up wherein concentrated solar energy from a heliostat field enters an aperture located at the bottom of the reactor. In the endothermic calcination step, concentrated solar radiation is captured by the inner cavity and transferred by conduction through a diathermal cavity wall to the particulate CaCO3 medium located in the annular reaction zone. The liberated CO2 is removed from the reactor to external storage. In the exothermic carbonation step, a CO2-containing gas flows through a bed of CaO particles in the reaction zone, forming CaCO3, while CO2-depleted gas leaves the system. The reactor design is refined using a numerical heat and fluid flow model for the calcination step. The Monte Carlo ray-tracing method is employed to solve for radiative exchange in the inner cavity, coupled with a computational fluid dynamics analysis to solve the mass, momentum, and energy equations in the concentric reaction zone modeled as a gas-saturated porous medium consisting of optically large semitransparent particles. The cavity diameter and length-to-diameter ratio are varied to study their effects on pressure drop, temperature distribution, and heat transfer in the reactor. Increasing the cavity diameter and length-to-diameter ratio decreases the radial temperature gradients across the cavity wall and within the reaction zone. However, it also results in increased pressure drop and reduced heat transfer to the reaction zone.

Original languageEnglish (US)
DOIs
StatePublished - 2014
Event15th International Heat Transfer Conference, IHTC 2014 - Kyoto, Japan
Duration: Aug 10 2014Aug 15 2014

Other

Other15th International Heat Transfer Conference, IHTC 2014
CountryJapan
CityKyoto
Period8/10/148/15/14

Keywords

  • Carbon emission mitigation
  • Carbonation-calcination cycle
  • Chemical reactor modeling
  • Radiation
  • Solar energy

Fingerprint Dive into the research topics of 'Heat and mass transfer model of a packed-bed reactor for solar thermochemical CO<sub>2</sub> capture'. Together they form a unique fingerprint.

Cite this