Modeling Spray Dryer Performance in Flue Gas Scrubbing

Kolluri, Ramana; Hatcher, William J.; Jefcoat, I.A.

doi:10.1080/07373939108916671

Cited by 4 publications

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“…Numerous studies have been conducted to improve the desulfurization efficiency and the utilization of sorbents, including the addition of deliquescent salts or fly ash to the absorbing slurry ( − ); the recycling of particles ( , ); and the behavior of mixing and reaction between gas and spray through experimental or numerical approaches ( − ). Some mathematical models have also been suggested for single droplets ( − ). However, most studies on spray drying absorbers have focused on the development of the sorbents, the recycling process of dried products, and the effects of additives.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Spray Characteristics in the Spray Drying Absorber

Yang

Kim

2000

Environ. Sci. Technol.

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A pilot-scale spray drying absorber (SDA) system was set up to evaluate the effect of spray characteristics on flue gas desulfurization efficiency. Varying spray injection conditions and inlet gas conditions, SO 2 concentrations were measured using a combustion gas analyzer. As a reagent, a slaked lime (Ca(OH) 2 ) slurry was treated with flue gas containing SO 2 . The influence of each parameter is determined by the compromise between the droplet absorption capability and SO 2 gas supply to the region of the droplet cloud. When the SO 2 molecules are sufficiently supplied to the wet droplet surface, the variation of the total droplet surface area plays a dominant role in the desulfurization process. The conditions of low inlet gas temperature and low slurry feed rate are included in this case. However, when the droplets of sprayed slurries are too small or evaporation proceeds too fast, the SO 2 molecules cannot be sufficiently transferred to the droplet surface. The excess calcium sorbents in the droplets dry out before they react with the hot gas. Consequently, the desulfurization efficiency as well as the utilization efficiency of Ca decreases for the smaller droplets. This trend appears to be dominant in conditions of high gas temperature and large slurry feed rate with the small Sauter mean diameter (SMD) of spray droplets. From the experimental results, we proposed two empirical models for the desulfurization efficiency and operating conditions.

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Section: Introductionmentioning

confidence: 99%

Experimental Study on the Spray Characteristics in the Spray Drying Absorber

Yang

Kim

2000

Environ. Sci. Technol.

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Effect of initial droplet size distribution on sulfur removal efficiency in FGD/SDA

Jung

Kim

et al. 1999

Korean J. Chem. Eng.

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Application of basic 3‐phase equilibrium distribution model to spray drying sorber for simultaneous removal of so₂and vinyl chloride

Koo

Baek

1997

Journal of Environmental Science and Health . Part A: Environme

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Simultaneous removal efficiencies of hydrophilic (SO 2 ) and hydrophobic (vinyl chloride) gaseous pollutants are experimentally determined, and the macroscopic removal mechanism of pollutants in a spray drying sorber(SDS) is analyzed using the extended model of three phase equilibrium distribution of pollutant at high temperatures which is basically based on the different morphological conditions of adsorbent and water at varying relative humidities.For the practical simplicity, the inside of spray drying sorber is divided into three regions of ; (1) absorption, (2) transition and (3) adsorption, and the removal efficiencies of each pollutants at three different regions are observed at different experimental conditions to estimate the effects of important parameters of SDS. The two types of slurry are made of the two sorbents : 10 wt% Ca(OH) 2 and 10 wt% NaOH.The result of temperature effect shows the height of absorption and transition region is decreased as the operation temperature is increased. Therefore, it resulted in the lower removal efficiency for SO 2 , and the higher removal 1557 1558 KOO AND BAEK efficiency for vinyl chloride in the adsorption region of SDS. The removal efficiency of SO 2 with NaOH slurry is higher than with Ca(OH) 2 slurry due to the hygroscopic nature of NaOH, while the removal of vinyl chloride is higher in Ca(OH) 2 case.From the analysis of results using three-phase equilibrium distribution model, the effective two-phase partition coefficients can be obtained, and the possible extension in the application of the three-phase equilibrium model in SDS design has been demonstrated.

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Modeling Spray Dryer Performance in Flue Gas Scrubbing

Cited by 4 publications

References 1 publication

Experimental Study on the Spray Characteristics in the Spray Drying Absorber

Experimental Study on the Spray Characteristics in the Spray Drying Absorber

Effect of initial droplet size distribution on sulfur removal efficiency in FGD/SDA

Application of basic 3‐phase equilibrium distribution model to spray drying sorber for simultaneous removal of so₂and vinyl chloride

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Modeling Spray Dryer Performance in Flue Gas Scrubbing

Cited by 4 publications

References 1 publication

Experimental Study on the Spray Characteristics in the Spray Drying Absorber

Experimental Study on the Spray Characteristics in the Spray Drying Absorber

Effect of initial droplet size distribution on sulfur removal efficiency in FGD/SDA

Application of basic 3‐phase equilibrium distribution model to spray drying sorber for simultaneous removal of so2and vinyl chloride

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Application of basic 3‐phase equilibrium distribution model to spray drying sorber for simultaneous removal of so₂and vinyl chloride