A bubbling fluidized bed solar reactor model of biomass char high temperature steam-only gasification

Gordillo, E.D.; Belghit, Abdelhamid

doi:10.1016/j.fuproc.2010.09.021

Cited by 35 publications

(28 citation statements)

References 23 publications

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“…To our knowledge the only solar reactor modelling attempts in the literature that utilise this approach are found in studies of coal-or biomass-based STRSs. Momentum conservation in the dense fluidised systems studied in (Gordillo and Belghit, 2011a;Kenarsari and Zheng, 2014;Zedtwitz et al, 2007) were treated only implicitly by assuming plug flow and choosing a minimum fluidisation velocity calculated from an empirical correlation, and not at all in (von Zedtwitz and Steinfeld, 2005).…”

Section: Momentum Transfermentioning

confidence: 99%

“…Energy transfer in modelling studies of dense fluidised beds in the literature use coarse-grained, onedimensional LTNE models with correlations for the volumetric heat transfer coefficient (Gordillo and Belghit, 2011a;Kenarsari and Zheng, 2014;Zedtwitz et al, 2007;Zedtwitz and Steinfeld, 2005). Gordillo and Belghit (2011a) proposed a one-dimensional model that accounts for the existence of bubbles in the dense fluidised bed by essentially treating them as an independent phase by assigning them their own energy and mass balance equations. The power per volume delivered to the control volume by thermal conduction is described by Fourier's law and is included in almost all modelling studies:…”

Section: Energy Transfermentioning

confidence: 99%

“…Studies such as (Keene et al, 2013;Lipiń ski and Steinfeld, 2004;Yue and Lipiń ski, 2015a,b,c) deal with the nonlinear temperature dependence of enthalpy by including the temperature dependence implicitly which allows for a natural inclusion of the enthalpy of formation when solving for the energy of individual gas and solid components. The use of a temperature dependent specific heat times a temperature in place of an enthalpy was used in (Gordillo and Belghit, 2011a;Lapp and Lipiń ski, 2014;Wang et al, 2014b) among others. Enthalpy of formation may also appear as a source term in the energy balance equation when considering a single-phase equation only.…”

Section: Energy Transfermentioning

confidence: 99%

“…The Rosseland diffusion approximation (RD) is an approximate solution to the RTE in the optically thick limit that allows the definition of an effective thermal conductivity (with a cubic temperature dependence) to be defined and simply added in the thermal conduction term of the energy equation. This approximation has found wide use in the literature among studies in the dense fluidised (Gordillo and Belghit, 2011a), and stationary (Bader et al, 2015;Bala Chandran et al, 2015a;Dombrovsky et al, 2009;Ebner and Lipiń ski, 2012;Gordillo and Belghit, 2011b;Keene et al, 2013Keene et al, , 2014Lapp et al, 2013;Lapp and Lipiń ski, 2014;Lipiń ski and Steinfeld, 2004;Martinek et al, 2014;Müller et al, 2008;Yue and Lipiń ski, 2015b regimes. A thermal conductivity correlation to account for radiation in optically thick media that behaves much like the RD was used in (Ströhle et al, 2014).…”

Section: Radiative Energy Transfermentioning

confidence: 99%

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Modelling of solar thermochemical reaction systems

et al. 2017

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a b s t r a c tThis article reviews the progress, challenges and opportunities in numerical modelling of thermal transport, thermochemical reactions and thermomechanics in high-temperature solar thermochemical systems. Continuum-scale models are presented in mathematical detail while highlighting the literature that uses them. The discussion is enhanced by selected examples of numerical studies of solar thermochemical systems for solar fuels and commodity material production. Property predictions necessary for the modelling of solar thermochemical reaction systems are covered.

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Section: Momentum Transfermentioning

confidence: 99%

Section: Energy Transfermentioning

confidence: 99%

Section: Energy Transfermentioning

confidence: 99%

Section: Radiative Energy Transfermentioning

confidence: 99%

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Modelling of solar thermochemical reaction systems

et al. 2017

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“…However, they mainly focused on reactor scale experiments and modeling. These studies have yielded more insight on the design of the reactors (fixed bed [14][15][16][17], fluidized bed [18,19], cyclonic [9,20]) and the possibilities of the technology. Two reviews are available on the subject [21,22].…”

Section: Introductionmentioning

confidence: 99%

Biomass gasification under high solar heat flux: Experiments on thermally thick samples

Pozzobon

Salvador

Bézian

2016

Fuel

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gasification under high solar heat flux: Experiments on thermally thick samples. Fuel, Elsevier, 2016, 174, pp.257-266 Beech wood is exposed to radiative heat flux higher than 1000 kW/m 2 . Sample geometry evolves dramatically. Temperature higher than 1500°C are reached. Tar yield is lowered by thermal cracking and steam reforming. Initial moisture content plays key role in the biomass behavior. t r a c tIn this study, thermally thick samples of beech wood are exposed to radiative heat flux above 1 MW/m 2 (1000 suns). It was motivated by the fact that concentrated solar energy allows to achieve temperatures higher than 1200 °C where char gasification, tar thermal cracking and tar steam reforming can take place. It is achieved using a new experimental device made of an artificial sun and a new reaction chamber, that monitors the sample mass throughout a run and can trap the produced tars using a liquid nitrogen cooled tar condensing device. Thanks to this experimental device, it is possible to compute the average wood consumption rate as well as drying water, char, gas and tar production rates. The produced light gases are also analyzed using microGC. Furthermore, a radiometer is used to monitor surface temperature, which is around 1500 °C. First, a new behavior has been highlighted. Under high radiative heat flux, a char crater which mirrored incident heat flux distribution, is formed inside of the sample. Then, using this device, the impact of two major parameters was tested: wood fiber orientation relative to the solar flux and initial moisture content. Wood fiber orientation (end grain and with the grain) was shown to only have a minor impact on the production rates, gas composition and crater formation. Three initial moisture contents (0, 9 and 55 %wb) were tested. It was shown that increasing the sample moisture leads to direct drying steam gasification of the char produced by the pyrolysis. Moreover, steam also promotes tar steam reforming and therefore decreases the tar yield. Finally, form an energetic point of view, the dry samples can achieve an energetic conversion efficiency of 90%, capturing up to 72% of the incident solar power in chemical form.

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Simulation of high‐temperature steam‐only gasification of woody biomass with dry‐sorption CO₂ capture

et al. 2016

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Over the last few decades, research on the abatement of carbon dioxide (CO2) gas has gained momentum, due to its increasing atmospheric levels. This study investigated high‐temperature steam‐only gasification of woody biomass for the production of high‐purity hydrogen integrated with CO2 capture in a moving‐bed gasifier. Extensive process modelling and simulation were performed using the superior solid handling features of the Aspen Plus process simulator software. After validating the model with experimental data from a demonstration plant available in the open literature, a reversible carbonation‐calcination reaction of calcium oxide (CaO) with CO2 was added to the system. Sensitivity analyses were conducted to verify the predictive accuracy of the model. The effects of steam‐to‐carbon (S/C) ratio on the resulting gas composition were thoroughly studied to delineate the complex process of gasification. Beyond the mitigation of CO2 emissions, the introduction of a CaO‐based sorbent in the process simulation significantly enhanced hydrogen production by simultaneously promoting the forward water‐gas shift reaction and reducing tars through increased tar‐cracking reactions. The results show that hydrogen of a higher purity was produced with the inclusion of dry‐sorption CO2 capture in the gasification process. Moreover, the addition of the sorbent increased the higher heating values (HHV) by 3 times and improved the cold gas efficiency by 34 %.

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A bubbling fluidized bed solar reactor model of biomass char high temperature steam-only gasification

Cited by 35 publications

References 23 publications

Modelling of solar thermochemical reaction systems

Modelling of solar thermochemical reaction systems

Biomass gasification under high solar heat flux: Experiments on thermally thick samples

Simulation of high‐temperature steam‐only gasification of woody biomass with dry‐sorption CO₂ capture

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A bubbling fluidized bed solar reactor model of biomass char high temperature steam-only gasification

Cited by 35 publications

References 23 publications

Modelling of solar thermochemical reaction systems

Modelling of solar thermochemical reaction systems

Biomass gasification under high solar heat flux: Experiments on thermally thick samples

Simulation of high‐temperature steam‐only gasification of woody biomass with dry‐sorption CO2 capture

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Product

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Simulation of high‐temperature steam‐only gasification of woody biomass with dry‐sorption CO₂ capture