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Thermal Analysis Kinetics of CO2Capture from Cement Industrial Flue Gases by Calcium-based Sorbents

Author: ZhangLeLe
Tutor: LiHui
School: Xi'an University of Architecture and Technology
Course: Materials Science
Keywords: high carbon dioxide concentration limestone decomposition CaOcarbonation reaction state kinetic parameters
CLC: TQ132.32
Type: Master's thesis
Year: 2013
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Abstract


To develope a technology of CO2capture from cement industrial flue gases by acombination of oxygen-enriched combustion and calcium based sorbents in a cyclicprocess of calcination and carbonation, investigation were carried out to study thekinetics of limestone thermal decomposition and CaO carbonation in a stacked state anda simulated suspension state respectively under a high CO2concentration condition（C CO2≥30%）. The results showed that:Under a stacked state or a simulated suspension state, limestone thermaldecomposition process coud be both modelled as a randomly nucleation, accompaniedby its growth. The reaction order of limestone thermal decomposition varied from2/5to3/4under different CO2concentrations. The higher the CO2concentration was, thehigher activation energy E and pre-exponential factor lnA could be. It was measured andcalculated that the activation energy varied from958.28to2556.10kJ/mol and thepre-exponential factor lnA changed from103.67to242.44. In addition, the activationenergy E rised exponentially with an increase of CO2concentration in a stacked state,fllowed a relationship as Eα→0=655.19e1.4CCO2。.Under a stacked state and a simulated suspension state, the mechanism of CaOcarbonation in chemical control phase followed a model of randomly nucleation and itsgrowth. It was calculated that the activation energy varied from86.77to187.46kJ/mol,the pre-exponential factor lnA was from5.9to19.94. In the diffusion controlled phase,however, the reaction mechanism followed a model of spherical interface contractionreaction, where the required reaction activation energy E could be between138.70and 275.44kJ/mol, the pre-exponential factor lnA from10.29to27.56. The higher the CO2concentration was, the lower activation energy of CaO carbonatation was needed.Containing a certain amount of dolomite in limestone was in favor of limestonedecomposing and CaO carbonating. The smaller the limestone particle size was, thelower activation energy and pre-exponential factor lnA were required for limestonedecomposition and CaO carbonation.Under the same CO2concentration, both the activation energy E and thepre-exponential factor lnA of limestone thermal decomposition and CaO carbonationin a simulated suspension state were lower than those in a stacked state.

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CLC: > Industrial Technology > Chemical Industry > Inorganic compounds, the chemical industry of the metal elements > Section II group metal elements of inorganic compounds > Inorganic compounds of elements of the alkaline earth metal (Ⅱ A family ) > Inorganic compounds of calcium
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