Sulfation Rates of Particles in Calcium Looping Reactors

Alonso, Mònica; Cordero, José María; Arias, B.; Abanades, J.C.

doi:10.1002/ceat.201200614

Cited by 15 publications

(12 citation statements)

References 37 publications

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“…The effect of the different variables on the sulphation rates in the CaL reactors have been studied previously [19,56,61,62], including an investigation of the sulphation of the purges from a pilot [19], with the samples being taken from the calciner of the CaL.…”

Section: Resultsmentioning

confidence: 99%

Modelling of the kinetics of sulphation of CaO particles under CaL reactor conditions

Cordero

Alonso

2015

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Furthermore it is demonstrated that the number of calcination carbonation cycles changes the sulphation patterns of the CaO from heterogeneous to homogeneous in all the limestones tested. For 50 carbonation calcination cycles and for particle sizes below 200 µm, the sulphation pattern is in all cases homogeneous. The sulphation rates were found to be first order with respect to SO 2 , and zero with respect to CO 2 . Steam was observed to have a positive effect only in the diffusion through the product layer controlled regime, as it leads to an improvement in the sulfation rates and effectiveness of the sorbent. Most of the experimental results of sulfation of highly cycled sorbents under all conditions can be fitted by means of the Random Pore Model (RPM) assuming that the kinetics and diffusion through the product layer of the CaSO 4 are the controlling regimes.

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Section: Resultsmentioning

confidence: 99%

Modelling of the kinetics of sulphation of CaO particles under CaL reactor conditions

Cordero

Alonso

2015

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“…The arsenate reaction and sulfate reaction were probably taken place at the same reactive site on the surface of CaO particles. The formation of CaSO 3 /CaSO 4 products layer occupied the free surface available for arsenic capture [26,31], decreasing the arsenic capture capacity. With the temperature increasing from 573 to 1023 K, the interaction between CaO and SO 2 was enhanced and more active sites were occupied by forming CaSO 3 /CaSO 4 .…”

Section: Effect Of So 2 On the As 2 O 3 (G) Capture By Caomentioning

confidence: 99%

Findings of proper temperatures for arsenic capture by CaO in the simulated flue gas with and without SO2

Chen

Zhang

et al. 2015

Chemical Engineering Journal

119

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“…). Thanks to the very high Ca/S ratio, sulfur dioxide is also removed with very high efficiency in the carbonator (Alonso et al, 2014;Arias et al, 2013) by reaction with CaO forming CaSO 4 . Therefore, gas treated in the carbonator does not need further desulfurization in a wet flue gas desulfurizer (FGD).…”

Section: Reference Pcpp+cal Power Plant Without Solids Storagementioning

confidence: 99%

Improved Flexibility and Economics of Calcium Looping Power Plants by Thermochemical Energy Storage

2018

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In this work, a Calcium looping (CaL) system including high temperature sorbent storage is presented, allowing to reduce the size of the calciner and the associated capital-intensive equipment (ASU and CPU). Reduction of the capital costs is particularly important for power plants with low capacity factors, which is becoming increasingly frequent for fossil fuel power plants in electric energy mixes with increasing share of intermittent renewables. The process assessment is performed by: (i) defining pulverized coal power plant (PCPP) with CaL capture system with and without sorbent storage and their mass and energy balances at nominal load; (ii) defining a simple method to predict the performance of the plant at part-load; (iii) defining the economic model, including functions for the estimation of the plant equipment cost; (iv) performing yearly simulations of the systems to calculate yearly electricity production, CO 2 emissions and levelized cost of electricity for different sizes of the calcination line and the storage system and (v) performing sensitivity analysis with different power production plans and carbon taxes. With this process, optimal size of the calciner and of the storage system minimizing the cost of electricity have been found. The optimal plant design was found to correspond to a solids storage system sized to manage the weekly cycling and a calciner line sized on the average weekly load. However, to avoid excessively large solids storage system, sizing the calciner on the average daily load and the storage system to manage the daily cycling appears more feasible from the logistic viewpoint and leads to minor economic penalty compared with the optimal plant design. For the selected case sized on the daily cycling, reduction of the cost of CO 2 avoided between 16% and 26% have been obtained compared to the reference CaL plant without solids storage, for representative medium and low capacity factor scenarios respectively.

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Sulfation Rates of Particles in Calcium Looping Reactors

Cited by 15 publications

References 37 publications

Modelling of the kinetics of sulphation of CaO particles under CaL reactor conditions

Modelling of the kinetics of sulphation of CaO particles under CaL reactor conditions

Findings of proper temperatures for arsenic capture by CaO in the simulated flue gas with and without SO2

Improved Flexibility and Economics of Calcium Looping Power Plants by Thermochemical Energy Storage

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