The kinetics of the absorption of sulfur dioxide in calcium hydroxide suspensions

“…The absorption of SO 2 into aqueous slurries of sodium, calcium, and magnesium compounds, serving as the absorbent (7)(8)(9)(10)(11)(12)(13)(14), and alkaline solutions, has been studied for decades. The medium used in the alkaline solutions was typically alkaline salts (15)(16)(17)(18)(19), inorganic acids (20), organic acids (21)(22)(23)(24), and amines for reversible reaction (25)(26)(27)(28)(29).…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Absorption of Carbon Dioxide and Sulfur Dioxide into Aqueous 1,8-Diamino-p-menthane

Hwang¹,

Kim²,

Park³

et al. 2009

Separation Science and Technology

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Carbon dioxide and sulfur dioxide were simultaneously absorbed into aqueous 1,8-diamino-p-menthane (DAM) in a stirred semi-batch tank with a planar gas-liquid interface within a range of 0-2.0 kmol=m 3 of DAM, 0.01-0.12 mole fraction of CO 2 , 0.001-0.012 mole fraction of SO 2 , and 298-318 K. Absorption data of each gas in the CO 2 -DAM and SO 2 -DAM systems are obtained to verify their reaction regimes, based on film theory, respectively, which are used to analyze the simultaneous absorption mechanisms of CO 2 and SO 2 in the CO 2 -SO 2 -DAM systems. In the simultaneous absorption rate of CO 2 and SO 2 into DAM solution, the absorption of CO 2 belongs to the second-order reaction of finite rate and the absorption of SO 2 belongs to the instantaneous reaction regime.

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“…The net result is that typically only minor amounts of CO 2 are absorbed. 1,[7][8][9] The spray-dry FGD process is characterized by a complex interplay of two-phase fluid dynamics, heat and mass transfer, liquid-phase dissolution, ionic reactions, and precipitation. The process can be divided into three steps: a first short stage after atomization in which the droplets decelerate until they reach their terminal velocity; a second "constant rate" drying stage, accounting for most of the S removal, until a solid shell (crust) starts to form at the surface of the drops; and a third "falling rate" drying stage, characterized by lower mass transfer rates, until the particles are dried.…”

Section: Introductionmentioning

confidence: 99%

Spray-Dry Desulfurization of Flue Gas from Heavy Oil Combustion

Scala

Lancia

Nigro

et al. 2005

Journal of the Air & Waste Management Association

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An experimental investigation on sulfur dioxide removal in a pilot-scale spray dryer from the flue gas generated by combustion of low-sulfur (S) heavy oil is reported. A limewater slurry was sprayed through an ultrasonic two-fluid atomizer in the spray-dry chamber, and the spent sorbent was collected downstream in a pulse-jet baghouse together with fly ash. Flue gas was sampled at different points to measure the desulfurization efficiency after both the spray-dry chamber and the baghouse. Parametric tests were performed to study the effect of the following variables: gas inlet temperature, difference between gas outlet temperature and adiabatic saturation temperature, lime-to-S ratio, and average size of lime particles in the slurry.Results indicated that spray drying is an effective technology for the desulfurization of low-S fuel oil flue gas, provided operating conditions are chosen carefully.In particular, the lowest gas inlet and outlet temperatures compatible with baghouse operation should be selected, as should a sufficiently high lime-to-S ratio. The attainment of a small lime particle size in the slurry is critical for obtaining a high desulfurization efficiency.A previously presented spray-dry flue gas desulfurization model was used to simulate the pilot-scale desulfurization tests, to check the ability of the model to predict the S capture data and its usefulness as a design tool, minimizing the need for pilot-scale experimentation.Comparison between model and experimental results was fairly good for the whole range of calcium/S ratios considered.

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The kinetics of the absorption of sulfur dioxide in calcium hydroxide suspensions

Cited by 19 publications

References 9 publications

Modelling of trona based spray dry scrubbing of SO2

Modelling of trona based spray dry scrubbing of SO2

Simultaneous Absorption of Carbon Dioxide and Sulfur Dioxide into Aqueous 1,8-Diamino-p-menthane

Spray-Dry Desulfurization of Flue Gas from Heavy Oil Combustion

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