The effect of water on the sulphation of limestone

Wang, Chunbo; Jia, Lei; Tan, Yewen; Anthony, Edward J.

doi:10.1016/j.fuel.2010.04.022

Cited by 48 publications

(57 citation statements)

References 14 publications

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“…The CFBC conditions ( Figure 10a) were simulated using a mixed gas conditions. During the first step of reaction where the kinetic controlled regime was predominant (Figure 10b), the steam content had no effect on sulphation conversion during the fast stage, which is consistent with the data reported by other authors [65,66]. However, the maximum X CaO achieved increased with the steam content.…”

Section: Resultssupporting

confidence: 90%

“…However, steam is a common component of the gas streams produced in power generation. Recently some works [65,66] have been published that take into account the influence of steam on the sulphation of CaO. They found an enhancement of the sulphur carrying capacities of the limes tested because of an improvement in the rates of diffusion through the product layer.…”

Section: Resultsmentioning

confidence: 99%

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

Cordero

Alonso

2015

Fuel

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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: Resultssupporting

confidence: 90%

Section: Resultsmentioning

confidence: 99%

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

Cordero

Alonso

2015

Fuel

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“…Apparently, under this test condition, carbonation of CaO was not greatly influenced by SO 2 concentration. In other words, the carbonation reaction was faster than the sulfation reaction under this particular test condition and the same phenomenon had been observed in the authors' previous works [23,34]. Also, from the data presented in Fig.…”

Section: The Effect Of So 2 Concentrationsupporting

confidence: 90%

“…It was found that carbonation could significantly be accelerated by H 2 O. The sulfation of CaO could also be greatly improved by the presence of H 2 O [34]. However, in that study, the influence of SO 2 on the carbonation of CaO was not considered.…”

Section: Introductionmentioning

confidence: 86%

Simultaneous Carbonation and Sulfation of CaO in Oxy‐Fuel CFB Combustion

Wang

Jia²,

Tan³

2011

Chem Eng & Technol

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For anthracites and petroleum cokes, the typical combustion temperature in a circulating fluidized bed (CFB) is > 900°C. At CO 2 concentrations of 80-85 % (typical of oxy-fuel CFBC conditions), limestone still calcines. When the ash which includes unreacted CaO cools to the calcination temperature, carbonation of fly ash deposited on cool surfaces may occur. At the same time, indirect and direct sulfation of limestone also will occur, possibly leading to more deposition. In this study, CaO was carbonated and sulfated simultaneously in a thermogravimetric analyzer (TGA) under conditions expected in an oxy-fuel CFBC. It was found that temperature, and concentrations of CO 2 , SO 2 , and especially H 2 O are important factors in determining the carbonation/sulfation reactions of CaO.

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“…Figure 4 shows the conversion-time curves of the two limestones obtained at different temperatures, with particle sizes in the range of 0.1-0.2 mm. As commented by others researchers [25][26][27][28], two different stages can be observed both at direct and indirect sulphation conditions. This is better observed in Figure 5 where the first hours of the sulphation reaction is showed for Granicarb limestone.…”

Section: Effect Of Temperaturementioning

confidence: 67%