Other Air Pollution Control Techniques

Hesketh, Howard E.

doi:10.1007/978-1-4612-6236-7_8

Cited by 2 publications

(1 citation statement)

References 3 publications

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“…Cyclones, fabric filters, electrostatic precipitators, or wet scrubbers are conventionally employed to control the emission of particulates in hot gas streams. 1,2 Besides the traditional air pollution control devices, an alternative technology, granular bed filtration, has been used for collecting the micron and submicron dust particles in flue gases for many years. However, this technology has not been widely applied as a means of simultaneously removing fly ash and sulfur dioxide from power plant flue gases at high temperatures.…”

Section: Introductionmentioning

confidence: 99%

Filtration of Fly Ash Using a Fluidized-Bed Filter

Chiang

Wey

Liu

2005

Journal of the Air & Waste Management Association

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This study focuses on the control of particulates with a fluidized-bed filter in exhaust gas stream. The fluidizedbed filter classified in the granular bed filtration technology was employed to demonstrate the performance for removal of fly ash at indicated operating velocities, fixed bed heights, and bed temperatures; then the collecting mechanisms of particulates by fluidized-bed filter were studied. The size distribution of fly ash passing through the fluidized-bed filter was also analyzed. The results indicate that at higher operating velocities and fixed bed heights, the removal of fly ash is more efficient and inertial impaction is the main mechanism when the fluidizedbed is operated at room temperature (25°C). While operating at higher temperatures (200°C), efficiency of 93.2% to 99.4% can be achieved for submicron particles. It is supposed to be the diffusion mechanism that is responsible for collecting such small particles, and high temperature is a favorable condition because of diffusion.

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Section: Introductionmentioning

confidence: 99%

Filtration of Fly Ash Using a Fluidized-Bed Filter

Chiang

Wey

Liu

2005

Journal of the Air & Waste Management Association

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Kinetics of Vapor-Phase Mercury Uptake by Virgin and Sulfur-Impregnated Activated Carbons

Vidić

Chang

Thurnau

1998

Journal of the Air & Waste Management Association

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The injection of powdered activated carbon (PAC) into combustion flue gas, with subsequent collection in a particulate control device, and granular activated carbon (GAC) fixed-bed adsorption offer new promise for achieving high-quality air emissions with respect to elemental mercury concentrations. One of the key parameters that governs the applicability of adsorption technology to flue gas cleanup is the rate of vapor-phase mercury removal, which was the main focus of this study. The kinetics of vapor-phase mercury uptake by a virgin bituminous coal-based activated carbon (BPL), a commercially available sulfur impregnated activated carbon (HGR), and a BPL carbon impregnated with sulfur at 600 C (BPL-S) was evaluated as a function of temperature and elemental mercury concentration. For all three carbons, an increase in mercury concentration and a decrease in temperature resulted in an increased overall mercury uptake. The rate of mercury uptake by HGR carbon was slower at higher temperatures due to the change in sulfur structure, which induced a decreased number of terminal sulfur atoms available to react with mercury. For a given flue gas temperature, an increase in mercury concentration resulted in slower mercury uptake kinetics, which suggests that the rate of mercuric sulfide (HgS) diffusion into the sulfur mass is the rate-limiting step. The rate of mercury uptake by BPL-S carbon deteriorated with an increase in temperature, which indicates that the rate of HgS formation is the rate-limiting step in the overall mercury removal process. BPL-S carbon displayed faster uptake kinetics and higher total mercury uptake than HGR carbon, except for very high initial mercury concentrations (e.g.,>1,000 mg/m ).

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Other Air Pollution Control Techniques

Cited by 2 publications

References 3 publications

Filtration of Fly Ash Using a Fluidized-Bed Filter

Filtration of Fly Ash Using a Fluidized-Bed Filter

Kinetics of Vapor-Phase Mercury Uptake by Virgin and Sulfur-Impregnated Activated Carbons

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