Venturi scrubber performance model

Yung, S.C.; Calvert, Seymour; Barbarika, Harry F.

doi:10.1021/es60140a009

Cited by 58 publications

(51 citation statements)

References 6 publications

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“…It is known that gravitational wet scrubbers are generally not suitable for removing particles smaller than 1.0 mm. Scrubbers combined with electrical precipitation (Laitinen et al, 1997) and modified scrubbers (Boll, 1973;Yung et al, 1978;Fan et al, 1988;Spink, 1988) had been suggested as a means to increase small particle removal efficiency. However, operational conditions of the gravitational wet scrubber, including droplet residence time, droplet size, and liquid-to-gas flow ratio, may play a role in removing particles much smaller than 1.0 mm in diameter.…”

Section: Introduction Ementioning

confidence: 99%

Particle Removal Efficiency of Gravitational Wet Scrubber Considering Diffusion, Interception, and Impaction

Kim

Jung

et al. 2001

Environmental Engineering Science

120

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A method of predicting the particle removal efficiency of gravitational wet scrubbers and the particle size distribution properties, that considers diffusion, interception, and impaction, is presented to study the particle removal mechanisms of gravitational wet scrubbers. This method assumes a lognormal size distribution of aerosol particles as well as three additive collection efficiencies. Thus, the overall collection efficiency is described as the sum of all three. It is represented as a U-shaped curve with a minimum in the region of around 1.0 mm in particle diameter. This allows aerosols in the diffusion-and in the impactiondominant regions to be removed at a higher rate compared with aerosol in the intermediate region. As aerosols pass through the gravitational wet scrubber, the geometric standard deviations of the size distribution of polydispersed aerosols decrease. The geometric mean diameter of aerosol in the diffusion-dominant region increases, whereas it decreases in the impaction-dominant region. The present study also shows that in optimum operation conditions such as low droplet falling velocity, small droplet size, and high liquid-to-gas flow ratio, the gravitational wet scrubber has sufficient ability to remove particles whose diameters are much smaller than 1.0 mm.

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Section: Introduction Ementioning

confidence: 99%

Particle Removal Efficiency of Gravitational Wet Scrubber Considering Diffusion, Interception, and Impaction

Kim

Jung

et al. 2001

Environmental Engineering Science

120

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“…For purposes of calculating the example cost effectiveness, the pollutant is assumed to be PM at an inlet loading of approximately 7 g/sm 3 (3 gr/scf). The costs do not include costs for post-treatment or disposal of used solvent or waste [19]. Actual costs can be substantially higher than in the ranges shown for applications which require expensive materials, solvents, or treatment methods.…”

Section: Cost Estimationmentioning

confidence: 99%

Study of Venturi Scrubber Efficiency for Pesticide Industry

Desai

Sahu²

2014

ILNS

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A venturi scrubber is designed to effectively use the energy from the inlet gas stream to atomize the liquid being used to scrub the gas stream. This type of technology is a part of the group of air pollution controls. The air pollution generated from the industry is now become serious problem for the environment, which affect the living and non living thing on the Earth. Among all the air pollution monitoring equipment venturi scrubber found to suitable for prevention of air pollution by pesticide. It was found that scrubber shows 99.1 % efficiency.

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“…(I), each model applying a different set of assumptions (Calvert, 1970;Calvert et al, 1972;Behie and Beeckmans, 1973;Boll, 1973;Goel and Hollands, 1977b;Yung et al, 1978;Dau, 1979;Loffler and Schuch, 1981;Placek and Peters, 1981;Crowder et al, 1982;Azzopardi and Govan, 1983;Muir and Kuye, 1986). These assumptions are necessary since Eq.…”

Section: Theorymentioning

confidence: 99%

Gas-Borne Liquid Flow Rate in a Venturi Scrubber with Two Different Liquied Injection Arrangements

Koehler

Feldman

Leith

1987

Aerosol Science and Technology

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Although current theory for venturi scrubber efficiency assumes that gas-borne liquid flow rate, QL, remains constant throughout the scrubber, it actually varies as liquid evaporates, condenses, atomizes from the scrubber wall, or deposits to the wall. Experiments were conducted to measure QL at various locations in a venturi scrubber. Water was injected in two ways: (1) radially inward through a circumferential slot at the throat inlet, and (2) axially downward through a centered pipe at the converging section inlet. For each liquid injection arrangement, Q , was determined by measuring the water in the gas at 180 points in the venturi, under each of nine operating conditions defined by varying liquiddo-gas ratio and gas velocity in the throat. For radial injection, relatively little injected water was found to be gas borne throughou* the scrubber, whereas for axial injection, most or all injected water remained in the gas. For both liquid injection arrangements, the radial distribution of gas-borne liquid varied consistently with axial position; under every operating condition, the concentration of gas-borne liquid in the throat was highest near the injection point, whereas by the end of the diverging section, it was highest near the centerline. A mathematical model is proposed to explain the observed axial variations in gas-borne liquid Row rate. NOMENCLATUREA total cross-sectional area, m2A, cross-sectional area tor location j, m2 C average droplet mass concentration 111 gas core, kg/m3 Koehler, Feldman, and Leith fractional penetration (fraction of particles of specified diameter not collected by scrubber), dimensionless gas volumetric flow rate, m3/s gas volumetric flow rate entering scrubber (measured), m3/s gas-borne liquid volumetric flow rate, m3/s liquid volumetric flow rate injected into scrubber (measured), m3/s injected liquid-to-gas ratio (measured), dimensionless liquid volumetric flow rate injected into scrubber (model input; see Table I), m3/s liquid volumetric flow rate on wall, m3/s instantaneous change in Q , at specified axial position, m3/s local scrubber radius, m inlet and outlet duct radi-US, m throat radius, m cross-sectional radius, m gas-phase Reynolds number, dimensionless wall surface area, m2 sum of squares droplet velocity relative to scrubber wall, m/s gas velocity relative to scrubber wall, m/s gas velocity in throat relative to scrubber wall, m/s ratio of actual liquid flow rate at location j to average liquid flow rate through scrubber cross section, dimensionless

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Venturi scrubber performance model

Cited by 58 publications

References 6 publications

Particle Removal Efficiency of Gravitational Wet Scrubber Considering Diffusion, Interception, and Impaction

Particle Removal Efficiency of Gravitational Wet Scrubber Considering Diffusion, Interception, and Impaction

Study of Venturi Scrubber Efficiency for Pesticide Industry

Gas-Borne Liquid Flow Rate in a Venturi Scrubber with Two Different Liquied Injection Arrangements

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