Modeling study on the impaction and humidification process in desulfurization activation reactor

Wang, L.; Song, Yubao; Zhang, M.C.; Hu, Fan; Zhou, Yuegui; Fan, Weidong; Wu, Jinhong

doi:10.1016/j.ces.2004.09.060

Cited by 12 publications

(7 citation statements)

References 12 publications

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“…Due to the fact that the speed of the reaction in the liquid phase is higher than that of diffusion of the dissolved sorbent and SO 2 [28,29], one can assume that the reaction front occurs where there is zero concentration of both components, i.e., dissolved sorbent and SO 2 . This phase is called constant-rate period.…”

Section: Desulfurization Modelmentioning

confidence: 99%

Influence of the Lime Slurry Droplet Spectrum on the Efficiency of Semi‐Dry Flue Gas Desulfurization

Katolicky

Jícha

2012

Chem Eng & Technol

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A numerical model based on computational fluid dynamics is presented to predict the efficiency of a semi-dry flue gas desulfurization process. The Euler-Lagrange particle tracking method is used to predict both evaporation and mass transfer between the flue gas and the lime slurry droplets. The overall desulfurization process is split into two periods, i.e. the constant-rate and the falling-rate period, during which the fundamental chemical reaction between sulfur dioxide and calcium hydroxide is modeled. The absorption efficiency is calculated for different spray characteristics, taking into account different size spectra of the lime slurry droplets characterized by different standard deviations for a constant mass mean diameter d 50 of 25 lm. The results are compared with published experiments and show excellent agreement as well as a significant role of the spray characteristics in the FGD efficiency.

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Section: Desulfurization Modelmentioning

confidence: 99%

Influence of the Lime Slurry Droplet Spectrum on the Efficiency of Semi‐Dry Flue Gas Desulfurization

Katolicky

Jícha

2012

Chem Eng & Technol

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“…The water sprayer used a Y-type two-fluid nozzle. The droplet spray characteristics were selected according to the spray characteristics of two-fluid nozzles commonly used in semidry FGD reactors , . The average droplet diameter was about 75 µm and the spray angle was about 20°.…”

Section: Methodsmentioning

confidence: 99%

“…The contact efficiency between the spray droplets and the sorbent particles is an important parameter affecting the desulfurization efficiency in semidry FGD processes (17). The usual water spray method was a downstream water spray with the water sprayer facing upward, which prevented the negative effect of droplet deposition on the operating stability (18).…”

Section: Effect Of Water Spray Methodmentioning

confidence: 99%

Characteristics and Reactivity of Rapidly Hydrated Sorbent for Semidry Flue Gas Desulfurization

Zhou

You

Zhao

et al. 2008

Environ. Sci. Technol.

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Semidry flue gas desulfurization with a rapidly hydrated sorbent was studied in a pilot-scale circulating fluidized bed (CFB) experimental facility. The desulfurization efficiency was measured for various operating parameters, including the sorbent recirculation rate and the water spray method. The experimental results show that the desulfurization efficiencies of the rapidly hydrated sorbent were 1.5-3.0 times higher than a commonly used industrial sorbent for calcium to sulfur molar ratios from 1.2 to 3.0, mainly due to the higher specific surface area and pore volume. The Ca(OH)2 content in the cyclone separator ash was about 2.9% for the rapidly hydrated sorbent and was about 0.1% for the commonly used industrial sorbent, due to the different adhesion between the fine Ca(OH)2 particles and the fly ash particles, and the low cyclone separation efficiency for the fine Ca(OH)2 particles that fell off the sorbent particles. Therefore the actual recirculation rates of the active sorbent with Ca(OH)2 particles were higher for the rapidly hydrated sorbent, which also contributed to the higher desulfurization efficiency. The high fly ash content in the rapidly hydrated sorbent resulted in good operating stability. The desulfurization efficiency with upstream water spray was 10-15% higher than that with downstream water spray.

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“…As measured by a phase Doppler Particle Analyzer, the average diameters of fogging droplets were 50−100 μm, the fogging angles were 15−25°, and the mass flow rate of the sprayed water was 5−10 kg/h (the mass ratio of the spray water to the sorbents was 0.21−0.42 under the condition of Ca/S = 2.0); these measurements are consistent with commonly used values of droplet diameters and fogging angles. 22 The fogging nozzle was located on the centerline of the bed, 2.5 m above the distributor and 1.0 m above the sorbent feed port.…”

Section: ■ Introductionmentioning

confidence: 99%

Desulfurization Characteristics of Rapidly Hydrated Sorbents with Various Adhesive Carrier Particles for a Semidry CFB-FGD System

You

2013

Environ. Sci. Technol.

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Semidry flue gas desulfurization (FGD) experiments were conducted using rapidly hydrated sorbents with four different adhesive carrier particles: circulation ash from a circulating fluidized bed boiler (CFBB circulation ash), fly ash from the first electrical field of the electrostatic precipitator of a circulating fluidized bed boiler (CFBB ESP ash), fly ash from a chain boiler (chain boiler ash), and river sand smaller than 1 mm. The influences of various adhesive carrier particles and operating conditions on the desulfurization characteristics of the sorbents were investigated, including sprayed water, reaction temperature, and the ratio of calcium to sulfur (Ca/S). The experimental results indicated that the rapidly hydrated sorbents had better desulfurization characteristics by using adhesive carrier particles which possessed better pore, adhesion, and fluidization characteristics. The desulfurization efficiency of the system increased as the reaction temperature decreased, it improved from 35% to 90% as the mass flow rate of the sprayed water increased from 0 to 10 kg/h, and it increased from 65.6% to 82.7% as Ca/S increased from 1.0 to 2.0. Based on these findings, a new semidry circulating fluidized bed (CFB)-FGD system using rapidly hydrated sorbent was developed. Using the rapidly hydrated sorbent, this system uses a cyclone separator instead of an ESP or a bag filter to recycle the sorbent particles, thereby decreasing the system flow resistance, saving investment and operating costs of the solids collection equipment.

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Modeling study on the impaction and humidification process in desulfurization activation reactor

Cited by 12 publications

References 12 publications

Influence of the Lime Slurry Droplet Spectrum on the Efficiency of Semi‐Dry Flue Gas Desulfurization

Influence of the Lime Slurry Droplet Spectrum on the Efficiency of Semi‐Dry Flue Gas Desulfurization

Characteristics and Reactivity of Rapidly Hydrated Sorbent for Semidry Flue Gas Desulfurization

Desulfurization Characteristics of Rapidly Hydrated Sorbents with Various Adhesive Carrier Particles for a Semidry CFB-FGD System

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