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Modelling and CFD simulation of a fluidized bed reactor to capture CO2 by solid sorbents

Modelling and CFD simulation of a fluidized bed reactor to capture CO2 by solid sorbents

Molaei, M., Pericleous, K.A. and Patel, M.K. (2012) Modelling and CFD simulation of a fluidized bed reactor to capture CO2 by solid sorbents. In: Proceedings of the 8th International Conference on CFD in the oil & gas, metallurgical and process industries. E SINTEF research reports, A22601 . SINTEF, Trondheim, Norway. ISBN 9788214052626 (Print), 9788251928113 (Electronic)

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Abstract

CO2 capture from combustion exhaust gases by carbonation using a fluidised bed is a possible technological route to reduce carbon dioxide discharge to the atmosphere. Fossil fuels comprise main source of energy for power generation in existing power plants responsible, for 32% of CO2 emitted in the UK. Since most of these emissions are due to single large sources, in situ post-treatment of the combustion flue gas seems to be an efficient means of capture. In this work, CFD modelling has been used to study the efficiency of CO2 capture in a fluidized bed reactor containing a solid sorbent. A Lagrangian/Eulerian scheme has been developed for this purpose, with the particle tracking model used to describe CaO particle trajectories and mass, momentum and energy exchange with the carrier gas, entering the reactor in a typical flue gas composition. A steady-state condition is assumed, with each trajectory representing a parcel of particles of a given mass and diameter. The number of particles entering the fluidised bed is kept constant, and the fluidization velocity is chosen so that particles remain in the reactor. As the carbonation progresses, ‘heavier’ well-reacted particles are collected to the bottom of the reactor. In the case of a non-uniform size distribution, fine particles would escape from the top of the reactor; in order to keep such particles inside, the geometry was modified to reduce the fluidization velocity. CO2 reduction of the order of 37% was achieved in a single pass, with a mass loading of 116% particles to CO2 in gas phase and an effective reaction area of 29 m2/g of CaO.

Item Type: Conference Proceedings
Title of Proceedings: Proceedings of the 8th International Conference on CFD in the oil & gas, metallurgical and process industries
Additional Information: [1] This paper was presented at the 8th International Conference on CFD in Oil & Gas, Metallurgical and Process Industries, hosted by SINTEF and NTNU (Norwegian University of Science & Technology) in Trondheim, Norway from 21-23 June 2011. [2] This conference paper was originally published electronically on USB key only. [3] Paper reference: CFD11-116
Uncontrolled Keywords: CFD simulation, fluidized bed reactor, CO2 capture, carbonation
Subjects: T Technology > T Technology (General)
Pre-2014 Departments: School of Computing & Mathematical Sciences
School of Computing & Mathematical Sciences > Centre for Numerical Modelling & Process Analysis > Computational Science & Engineering Group
Related URLs:
Last Modified: 14 Oct 2016 09:17
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: None
URI: http://gala.gre.ac.uk/id/eprint/6671

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