An approach with use of ega to the mechanism of sulfur release during coal combustion

Schouten, J.C.; Hakvoort, G.; Valkenburg, P.J.M.; Bleek, C.M. van den

doi:10.1016/0040-6031(87)80257-5

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Determination of the Kinetics of SO₂ Absorption Using Thermogravimetry

Duisterwinkel

Hakvoort

1989

Bulletin des Soc Chimique

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SUMMARYA shrinking core model is proposed for the absorption of SO, in a sorbent consisting of CaO on y-A1203, which is made by a sol-gel method. The model assumes that pore diffusion and bulk gas transfer limit the absorption rate. Tests with a thermobalance, equipped with a special sampleholder to minimize external diffusion limitation, show that this model is very likely correct. In the thermobalance external diffusion limitation is important up to a conversion of approx. 40%. The mean effective pore diffusion coefficient is 5.3 t 0.5 lo-' m,/s. Relating this value to the Knudsen diffusion coefficient gives very realistic values for the tortuosity factor.

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Determination of the Kinetics of SO₂ Absorption Using Thermogravimetry

Duisterwinkel

Hakvoort

1989

Bulletin des Soc Chimique

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Evolved gas analysis (EGA) of brick clays

Parsons

Inglethorpe

Morgan

et al. 1997

Journal of Thermal Analysis

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Using a system based on non-dispersive infrared (NDIR) detectors, evolved gas analysis (EGA) was able to identify and quantify the principal volatiles produced by heating powdered samples of UK brick clays. From these results, atmospheric emissions likely to result from brick production can be predicted. In addition, EGA results for extruded brick clay test pieces are significantly different from those of powdered samples. Within an extruded brick clay body, evolved gases are contained within a pore system and evolved gas-solid phase reactions also occur. This EGA study provides further evidence on the nature of firing reactions within brick clay bodies. The qualitative and quantitative influence of heating rate -a key process condition in brick manufacture -on gas release is also outlined.

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