Kinetic studies on low temperature, dry flue gas desulphurization

Aichinger, G.; Brunner, C.; Khinast, Johannes G.; Seebauer, Veronika; Staudinger, Gernot

doi:10.1016/s0167-9449(06)80180-1

Cited by 5 publications

(2 citation statements)

References 2 publications

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“…Whereas Yoon et al19 detected a positive effect of RH on the initial solid reactivity, Rochelle et al16 observed a moderate effect at very short times. Experimental data reported2, 15, 20 at RH > 70% appear to show that the reaction does not stop at long times (after 1 h), even though the reaction rate has already dramatically decreased. On the other hand, the effect of NO 2 on the kinetics of this reaction has rarely been studied.…”

Section: Introductionmentioning

confidence: 90%

Kinetic modeling of the reaction between hydrated lime and SO₂ at low temperature

et al. 2005

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Section: Introductionmentioning

confidence: 90%

Kinetic modeling of the reaction between hydrated lime and SO₂ at low temperature

et al. 2005

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“…From the assumption of the non‐ideal adsorption of the gaseous component on the solid surface as the rate‐controlling step, the kinetic modelling of the desulfurization reaction at low temperatures using hydrated Ca(OH) 2 was described by Irabien et al who pointed out a dramatic influence of the relative humidity on the kinetics included in an estimated parameter defined from the non‐ideal behaviour 18. 19 Additional studies carried out in different reaction systems, (integral sand bed reactor and thermobalance device) confirmed that the main variable for the reactivity of lime is the relative humidity which can be varied by changing the partial pressure of water 20. 21…”

Section: Introductionmentioning

confidence: 95%

Thermogravimetric determination of the influence of water vapour in the FGD in-duct injection at low temperatures

Garea

Herrera

Renedo

et al. 2000

J. Chem. Technol. Biotechnol.

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The practical procedure to design and optimise the FGD in-duct injection processes at low temperatures requires the application of the kinetic rate equation of the reaction SO 2 ±Ca(OH) 2 in the mass balances of gas and solid phases corresponding to the ductwork, the sorbent utilization ability being an important parameter in the kinetic description. The objective of the study was focused on the behaviour of Ca(OH) 2 working under different levels of the process variables, temperature, relative humidity and water vapour content in the gas stream, in order to evaluate their in¯uence on the sorbent utilization in the desulfurization reaction. The experimental data were obtained in an integral ®xed bed reactor, monitoring continuously the SO 2 content in the exit gas stream until the breakthrough curve was completed. The solid product was analysed by a thermogravimetric technique to calculate the ®nal sorbent utilization. From the TG analysis, the contributions of the sulfation and carbonation reactions were established in terms of solid conversion: X S , mol of SO 2 mol of reacted sorbent and X C , mol of CO 2 mol of reacted sorbent, and X, total sorbent utilization considering the amounts of both calcium sulfate and calcium carbonate in the reaction product. A detailed planning of experiments was followed: three different temperature levels were investigated: 54, 60, 70°C, while the range of relative humidity was varied between 40 and 95%. The composition of the gas phase was kept constant (4000 ppmvSO 2 , 12% CO 2 , 5% O 2 , N 2 balance) as well as the amount of sorbent introduced in the reactor. The experimental data obtained were evaluated and the statistical signi®cance of the effects of relative humidity, temperature and their interactions, was tested through an ANOVA table. From the sorption results, it was seen that there was a slightly negative in¯uence of the reaction temperature while the relative humidity dependence was stronger at higher levels due to the sulfation reaction, with X S values increasing from 0.05 to 0.50 when the relative humidity increased from 40% to 95%. The contribution of the carbonation reaction to the solid utilization was not affected signi®cantly by the relative humidity or temperature. The carbonation fraction of reacted solid, X C , reached values of around 0.20 in the whole experimental range.

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Kinetic model for desulphurization at low temperatures using hydrated sorbent

et al. 1999

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Kinetic studies on low temperature, dry flue gas desulphurization

Cited by 5 publications

References 2 publications

Kinetic modeling of the reaction between hydrated lime and SO₂ at low temperature

Kinetic modeling of the reaction between hydrated lime and SO₂ at low temperature

Thermogravimetric determination of the influence of water vapour in the FGD in-duct injection at low temperatures

Kinetic model for desulphurization at low temperatures using hydrated sorbent

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Kinetic studies on low temperature, dry flue gas desulphurization

Cited by 5 publications

References 2 publications

Kinetic modeling of the reaction between hydrated lime and SO2 at low temperature

Kinetic modeling of the reaction between hydrated lime and SO2 at low temperature

Thermogravimetric determination of the influence of water vapour in the FGD in-duct injection at low temperatures

Kinetic model for desulphurization at low temperatures using hydrated sorbent

Contact Info

Product

Resources

About

Kinetic modeling of the reaction between hydrated lime and SO₂ at low temperature

Kinetic modeling of the reaction between hydrated lime and SO₂ at low temperature