On the Carbonation of Calcium Hydroxide

駿吉, 浅野; 達三, 杉田; 康暎, 山際; 嘉亀, 井上

doi:10.2109/jcersj1950.79.907_82

Cited by 4 publications

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“…Jander’s equation is frequently used in gas–solid reactions, − and it has been considered for the sorption model. The general form of this equation is shown in eq where t is the time (s), m is the reaction order ( m = 1 when the chemical reaction is the rate-determining step, and m = 2 when diffusion controls the reaction), and k is the kinetic constant (s –1 ), following Arrhenius’ law (eq ) where k 0 is the pre-exponential constant (s –1 ), E a is the energy of activation (kJ/mol), R is the gas constant (kJ mol –1 K –1 ), and T is the temperature (K).…”

Section: Mathematical Model Descriptionmentioning

confidence: 99%

Energy Assessment of Ethanol-Enhanced Steam Reforming by Means of Li₄SiO₄ Carbon Capture

et al. 2015

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High-temperature solid looping cycles for carbon capture provide a number of benefits when coupled with fuel reforming because they may combine the fuel reactor where the fuel is decarbonized with the CO 2 sorption step in the capture cycle. The heat released in the carbonation reaction may be used to run the endothermic steam reforming occurring in the same reactor, leading to an overall autothermic reaction. Another benefit derived from the presence of a CO 2 sorbent is the shifting of the equilibrium to greater hydrogen yields. A very promising approach is the utilization of Li 4 SiO 4 because this sorbent does not present a cyclic degradation as pronounced as the traditional Ca-based sorbents. The extremely high cost of Li 4 SiO 4 may be overcome through the production of the sorbent from rice husk, a kind of agriculture waste, which provides the silica source. Furthermore, rice husk Li 4 SiO 4 exhibits better sorption properties compared to that of pure Li 4 SiO 4 because of the alkaline element content from rice husks. In the State Key Laboratory of Coal Combustion, the kinetics of this enhanced process has been characterized. Different configurations may be adopted to integrate this capture process in a precombustion process for enhanced hydrogen production and minimize the energy penalty associated with sorbent regeneration. A fixed bed system has been modeled to assess the energy requirements of the system and the available energy for integration. By application of the experimental results obtained for Li 4 SiO 4 kinetics, the developed model allows for the estimation of syngas compositions, production rate, and energy flows. This model represents an interesting tool for the assessment of further applications of the enhanced reforming of gaseous fuels through in situ carbon capture with Li 4 SiO 4 .

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Section: Mathematical Model Descriptionmentioning

confidence: 99%

Energy Assessment of Ethanol-Enhanced Steam Reforming by Means of Li₄SiO₄ Carbon Capture

et al. 2015

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Development of porous solid reactant for thermal-energy storage and temperature upgrade using carbonation/decarbonation reaction

et al. 2001

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Influence of storage conditions on the carbonation of powdered Ca(OH)2

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On the Carbonation of Calcium Hydroxide

Cited by 4 publications

References 0 publications

Energy Assessment of Ethanol-Enhanced Steam Reforming by Means of Li₄SiO₄ Carbon Capture

Energy Assessment of Ethanol-Enhanced Steam Reforming by Means of Li₄SiO₄ Carbon Capture

Development of porous solid reactant for thermal-energy storage and temperature upgrade using carbonation/decarbonation reaction

Influence of storage conditions on the carbonation of powdered Ca(OH)2

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On the Carbonation of Calcium Hydroxide

Cited by 4 publications

References 0 publications

Energy Assessment of Ethanol-Enhanced Steam Reforming by Means of Li4SiO4 Carbon Capture

Energy Assessment of Ethanol-Enhanced Steam Reforming by Means of Li4SiO4 Carbon Capture

Development of porous solid reactant for thermal-energy storage and temperature upgrade using carbonation/decarbonation reaction

Influence of storage conditions on the carbonation of powdered Ca(OH)2

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Energy Assessment of Ethanol-Enhanced Steam Reforming by Means of Li₄SiO₄ Carbon Capture

Energy Assessment of Ethanol-Enhanced Steam Reforming by Means of Li₄SiO₄ Carbon Capture