Investigation of the Kinetics of Carbonation Reaction with Cao-Based Sorbents Using Experiments and Aspen Plus Simulation

Sedghkerdar, Mohammad Hashem; Mostafavi, Ehsan; Mahinpey, Nader

doi:10.1080/00986445.2013.871709

Cited by 28 publications

(27 citation statements)

References 18 publications

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“…In previous studies, the optimal carbonation temperature of Cadomin limestone over the temperature range of 600–750 °C and atmospheric pressure was found to be nearly 675 °C through thermogravimetric analysis. Optimal carbonation temperature was defined as the temperature at which the highest conversion of CaO occurs for the carbonation reaction.…”

Section: Resultsmentioning

confidence: 98%

“…Overall, there was close agreement between the simulation results and the experimental data for gasification without sorbent. Using the validated model in conjunction with our previous study on the carbonation of Cadomin limestone, predictions were made for the cases of biomass gasification with sorbent using the developed Aspen Plus model. The extents to which the S/C ratio in gasification affected product distribution and CGE were also reviewed and are discussed in the following section.…”

Section: Resultsmentioning

confidence: 99%

“…The optimal temperature for carbonation reaction (reaction 12) is 650–700 °C . At the top of the reactor, near the gasifier exit, where the temperature ranges from 350–475 °C, the carbonation reaction does not take place fast enough to substantially influence other reactions such at WGS and SMR.…”

Section: Resultsmentioning

confidence: 99%

“…Higher values of activation energies were chosen from the literature to achieve this goal. A sorbent‐to‐biomass ratio of ∼1 (g/g) was found to be sufficient under theoretical conditions with the assumption that the sorbent consisted primarily of CaO. A CaO stream flow of 50 kg/h was added to study the effect of sorbent. For the carbonation reaction, kinetic parameters for Cadomin limestone determined from our previous study were incorporated into the process model, as shown in Table (reaction 12). The proximate and ultimate analyses for the biomass sample according to Umeki et al appear in Table . Experimental conditions for the five experiments were based on data from Umeki et al These experimental conditions are shown in Table . The temperature profiles along the height of the gasifier are presented in Table . These temperatures are specified in the model for simulating each experimental case.…”

Section: Process Modelmentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Process Modelmentioning

confidence: 99%

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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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“…[41] The CO 2 was then replaced by N 2 , and the sample was heated to 850 8C. The Pyris software was used to control temperature and gas flow rate.…”

Section: Cyclic Co 2 Capturementioning

confidence: 99%

Core‐shell structured CaO‐based pellets protected by mesoporous ceramics shells for high‐temperature CO₂ capture

et al. 2016

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In this study, a series of core-shell structured spheriform CO 2 sorbents were synthesized by using CaO-based pellets as cores and different mesoporous metal oxides (e.g. alumina, ceria, and yttrium-stabilized zirconia) as shells through a repeated wet impregnation coating process. Cyclic CO 2 capture performance of the obtained sorbents was investigated using a thermogravimetric analyzer. Among all the core/shell sorbents under study, the pellets coated with a layer of alumina exhibit the best performance in the retention of CO 2 uptake over 20 cycles with the lowest activity loss of only 30.4 %, attributed to the existence of the thermal stable porous alumina shell which prevents the sintering and the aggregation of the CaO grains. Moreover, the attrition study using an air-jet apparatus and a standard test method reveals that such sorbents exhibit enhanced attrition resistance due to the protection of the porous shell providing them with a great potential for application in fluidized bed conditions.

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Potassium‐catalyzed steam gasification of ash‐free lignite coal with CO₂ capture

et al. 2017

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The purpose of this research was to study steam gasification of ash-free coal integrated with CO 2 capture in the presence of a K 2 O catalyst for enhancement of the key water-gas shift reaction and promotion of hydrogen production. To achieve this goal, gasification experiments on ash-free coal (AFC) were carried out at varying temperatures (600, 650, 675, 700, and 750 8C) with a sorbent-to-carbon (CaO/C) ratio of 2 and a catalyst (K 2 O) loading of 0.2 g/g (20 weight percent (wt%)) in a fixed-bed reactor equipped with a gas chromatography analyzer. The sorbent-to-carbon (CaO/C) ratio of 2 is based on dry and ash-free basis. The CaO/C ratio and K 2 O wt% were chosen to maximize hydrogen production based on our previously determined optimal values. The AFC was originally extracted from raw lignite coal using organic solvents, which allowed the sorptionenhanced gasification to be conducted with minimal ash-catalyst interactions. The effect of temperature on the yield and the initial reaction rate were investigated. The optimal reaction temperature of 675 8C was determined. Carbon balance and final carbon conversions were calculated based on the residue analysis. Activation energy was also calculated using intrinsic kinetics of the reaction. In this study, using AFC offered the potential advantage of operating the gasification process with catalyst recycle.

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Investigation of the Kinetics of Carbonation Reaction with Cao-Based Sorbents Using Experiments and Aspen Plus Simulation

Cited by 28 publications

References 18 publications

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

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

Core‐shell structured CaO‐based pellets protected by mesoporous ceramics shells for high‐temperature CO₂ capture

Potassium‐catalyzed steam gasification of ash‐free lignite coal with CO₂ capture

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Investigation of the Kinetics of Carbonation Reaction with Cao-Based Sorbents Using Experiments and Aspen Plus Simulation

Cited by 28 publications

References 18 publications

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

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

Core‐shell structured CaO‐based pellets protected by mesoporous ceramics shells for high‐temperature CO2 capture

Potassium‐catalyzed steam gasification of ash‐free lignite coal with CO2 capture

Contact Info

Product

Resources

About

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

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

Core‐shell structured CaO‐based pellets protected by mesoporous ceramics shells for high‐temperature CO₂ capture

Potassium‐catalyzed steam gasification of ash‐free lignite coal with CO₂ capture