Effects of wavelength and number of bends on the performance of zigzag demisters with drainage channels

Hamedi-Estakhrsar, M. H.; Rafee, Roohollah

doi:10.1016/j.apm.2015.08.023

Cited by 35 publications

(12 citation statements)

References 14 publications

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“…They found that the low Re k‐ε model is more superior than other turbulence models; Zamora and Kaiser 12 evaluated the performance for four types of wave plate mist eliminators that are commonly used in cooling towers through numerical calculations, studied the influence of turbulent droplet diffusion, inertial parameters, and the height‐to‐width ratio of separator channel. Besides, they developed a program which used to determine the functional relationship between total demisting efficiency and other parameters; Hamedi‐Estakhrsar and Rafee 13 studied the effects of the change in the number of stages and bending size of “Z” type demister with drainage channel on the separation efficiency and pressure drop. It was concluded that the increase or decrease of bending number or size would significantly improve pressure drop and droplet removal efficiency; Shen 14 analyzed the impact of collision and coalescence between droplets, the fragmentation of droplets by airflow, and the interaction between droplets and wall on separation efficiency.…”

Section: Introductionmentioning

confidence: 99%

Study on the performance of a vortex mist eliminator for improving the separation efficiency of fine particles

Liang

Song

Jiang

et al. 2022

Asia-Pacific J Chem Eng

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In the process of natural gas purification, common baffle demister has the problem of low separation efficiency and incomplete separation of fine droplets with the particle size in the range of 5-25 μm. This situation not only affects the quality of natural gas, but also causes corrosion and damage to gas equipment, and even seriously affects normal production. In order to solve these problems, we have carried out an innovative design for its structure. Based on the single-stage baffle, vortex blades are added at the first straight plate section from the inlet and the second straight plate section in the middle to enhance the turbulent vortex degree and complexity of the flow field in this area and improve the probability of collision of small particles with the wall, thus achieving the purpose of improving the demisting efficiency. In this paper, performance of the new mist eliminator is analyzed and evaluated by means of experimental study and computational fluid dynamics (CFD) numerical simulation. The results show that when the flow rate is 3.5-5.5 m/s, total separation efficiency of the new mist eliminator for fine particles with a particle size of 5-25 μm is about 51.72%-86.13%, which is about 38.57%-55.76% higher than ordinary baffled mist eliminator. The separation efficiency of particles with a diameter of 5 μm is about 31.79%, increased about 26.15%. The separation efficiency of particles with a diameter of 10 μm is about 52.09%, increased about 37.21%. In addition, when the flow rate is 3.5-5.5 m/s, the pressure drop is increased by about 41.68-135.97 Pa. It could be concluded that the new type of mist eliminator could effectively improve the demisting efficiency of fine droplets.

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Section: Introductionmentioning

confidence: 99%

Study on the performance of a vortex mist eliminator for improving the separation efficiency of fine particles

Liang

Song

Jiang

et al. 2022

Asia-Pacific J Chem Eng

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“…According to these assumptions, the factors influencing the separation efficiency including the geometry and distance of the channels, droplet diameters, physical properties of the gas and liquid, and velocities 3, 4 were studied experimentally and/or numerically. Zamora et al 5 Estakhrsar and Rafee, 6, 7 Kauousi, 8 Rafee et al 9 and Liu et al 10 studied the influence of the geometrical parameters, such as the bend number and angle, distance between the parallel plates, length between two successive bends, and drainage channels, on the separation performance of vane demisters. Wilkinson, 11 Koopman et al 12 and Banitabaei et al 13 studied the relationship between the separation efficiency and pressure drop for different the waveplate parameters.…”

Section: Introductionmentioning

confidence: 99%

Forming and stripping of the wall film and the influence on gas–liquid separation

Yuan

Fan

Chen

et al. 2020

Asia-Pacific J Chem Eng

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“…When a particle or droplet contained in the gas passes through the narrow channels between plates, those particles or droplets with high inertial force collide with the wall because they cannot follow the streamline as it repeatedly changes. Thus, collected particles or droplets collect on the wall to form a liquid film, which is drained by gravity (James and Wang, 1998;Melaaen and Jøsang, 2002;Azzopardi et al, 2003;Kulasekharan et al, 2013;Fan et al, 2015;Hamedi Estakhrsar et al, 2016). Due to this removal mechanism, existing ME do not effectively remove mists if the flow velocity is low or particle size is small; increasing the particle size or flow velocity increases the mist removal efficiency (Jiang et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Particle Removal Characteristics of A High-Velocity Electrostatic Mist Eliminator

Kim

Han

et al. 2020

Aerosol Air Qual. Res.

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In this study, we developed a flat plate-type wet electrostatic precipitator that generates stable corona discharge compared to wire-type discharge electrodes. Particle removal efficiencies were compared among differing shapes of the discharge electrode, including varying horizontal and vertical distances between spiked edges, and varying the height of the discharge pin support. When the horizontal distance between spiked edges was increased to 36 mm, the vertical distance between spiked edges increased to 54 mm, and when the height of the discharge pin support was increased to 76 mm, the removal efficiency of PM10 was maintained at approximately 60.0%. Furthermore, the removal efficiency of particles over 5 µm was about 80% or greater. When the flow rate was 4 m s -1 , the gap between collection plates was 60 mm, and -14 kV was applied to the discharge electrode. The particle removal efficiency of the flat plate-type electrostatic precipitator was maintained when the horizontal and vertical distances between spiked edges and the height of the discharge pin support were below threshold levels. Those variables may be important factors for designing the shape of the discharge electrode. Therefore, when designing electrostatic precipitators with multiple channels, the discharge electrode weight and processing costs must be considered when determining the optimal horizontal and vertical distances between spiked edges and the height of discharge pin support.

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Effects of wavelength and number of bends on the performance of zigzag demisters with drainage channels

Cited by 35 publications

References 14 publications

Study on the performance of a vortex mist eliminator for improving the separation efficiency of fine particles

Study on the performance of a vortex mist eliminator for improving the separation efficiency of fine particles

Forming and stripping of the wall film and the influence on gas–liquid separation

Particle Removal Characteristics of A High-Velocity Electrostatic Mist Eliminator

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