Heat transfer in a directly irradiated solar receiver/reactor for solid–gas reactions

A two‐dimensional model of methane thermal decomposition reactors is developed which accounts for coupled radiative heat and polydisperse carbon particle nucleation, growth, and transport. The model uses the Navier–Stokes equations for the fluid dynamics, the radiative transfer equation for methane and particle species radiation absorption, the advection–diffusion equation for gas and particle species transport, and a sectional method for particle species nucleation, heterogenous growth, and coagulation. The model is applied to a tubular laminar flow reactor. The simulation results indicate the development of a reaction boundary layer inside the reactor, which results in significant variation of the local particle size distribution across the reactor. © 2011 American Institute of Chemical Engineers AIChE J, 58: 2545–2556, 2012

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“…16,47,48 All of the above terms are explained in greater detail in Ref. 16,47,48 All of the above terms are explained in greater detail in Ref.…”

Section: Particle Transport Modelmentioning

confidence: 99%

Two‐dimensional model of methane thermal decomposition reactors with radiative heat transfer and carbon particle growth

et al. 2011

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“…Besides the SPR concepts where sand-like particles of 0.4-1 mm diameter are used, there are several designs utilizing sub-micrometer carbon particles [18][19][20][21]. Particle-laden gas flows are radiated, and temperatures above 2,100 K with nitrogen and 1,900 K with CO 2 as working gas were reported [18].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of a Centrifugal Particle Receiver for High-Temperature Concentrating Solar Applications

Uhlig

Buck

et al. 2015

Numerical Heat Transfer, Part A: Applications

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A three-dimensional, steady-state finite-element model (FEM) model of a centrifugal particle receiver for high-temperature concentrating solar applications has been developed. The model is built according to an experimentally examined 15 kW prototype in order to investigate the thermal receiver performance and the governing heat transfer mechanisms of the proposed receiver concept. Comparison to the experimental data reveals good agreement in terms of particle outlet temperature and absorbed heat. For a target particle outlet temperature of 900 C and a design input flux of 1 MW/m 2 , a receiver efficiency of >85% is predicted, indicating promising perspectives for the proposed receiver concept.

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“…Relatively few studies have deal with solar reactor modeling and simulation (Abanades et al, 2007;Agrafiotis et al, 2007;Petrasch and Steinfeld, 2007;Kogan et al, 2007;Palumbo et al, 2004;Meier et al, 1996). Some of those studies have been focused on radiative heat transfer within particle suspension exposed to concentrated solar radiation, included, steady state models based on the discrete ordinates methods, Monte Carlo (MC) methods and transient models based on the MC and Rosseland approximations and diffusion approach (Evans et al, 1987;Miller and Koenigsdorff, 1991;Mischler and Steinfeld, 1995;Hirsch and Steinfeld, 2004b;Osinaga et al, 2004;Lipinski and Steinfeld, 2004;Dombrovsky, 2002;Dombrovsky et al, 2007;Klein et al, 2007;Müller and Steinfeld, 2007). Other models and simulations have been developed in order to describe the temperature profile in the reactor and to have a multiphase flow method in the case of solid particle dissociation reaction (Abanades et al, 2007) and for the description of the thermochemical cycles for hydrogen production inside a honeycomb monolithic reactor under the influx of solar radiation on its front face (Agrafiotis et al, 2007;2005).…”

Section: Introductionmentioning

confidence: 99%

Heat Transfer Numerical Analysis of a Thermochemical Solar Reactor

Vázquez–Rodríguez¹,

Varela-Ham²,

Avalos-Zuniga³

et al. 2014

Energy Research Journal

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In this study a 2D transient temperature distribution in a onedimensional thermochemical solar reactor of gas-particles is presented. The gas-particles medium is contained in a reactor where an endothermic chemical reaction of some oxide-metal at high temperature is expected to be occurred. The reactor receives the concentrated solar power on the reactor walls, or directly to the gas-particles medium. As expected the temperature distribution in the reactor is quite homogeneous when it operates to close steady state conditions, but also due to the fact that the inlet cold gas is reheated with the exit warm gas. However, when the reactor starts to operate, the temperature distribution is non-homogeneous depending on how the reactor receives the concentrated solar power.

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Heat transfer in a directly irradiated solar receiver/reactor for solid–gas reactions

Cited by 54 publications

References 17 publications

Two‐dimensional model of methane thermal decomposition reactors with radiative heat transfer and carbon particle growth

Two‐dimensional model of methane thermal decomposition reactors with radiative heat transfer and carbon particle growth

Numerical Simulation of a Centrifugal Particle Receiver for High-Temperature Concentrating Solar Applications

Heat Transfer Numerical Analysis of a Thermochemical Solar Reactor

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