Study on performance of wave-plate mist eliminator with porous foam layer as enhanced structure. Part II: Experiments

Xu, Yichen; Yang, Zhenming; Zhang, Jinsong

doi:10.1016/j.ces.2017.05.030

Cited by 21 publications

(7 citation statements)

References 16 publications

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“…With ever-increasing attention being paid to environmental protection and green production, mist removal has recently become an indispensable step to prevent the escape of liquid droplets from a thermal system. [1,2] For example, in power generation plants, the wave-plate demisters are widely installed as an accessory to cooling towers for eliminating the generation of plume and reducing the carry-over of droplets. [3] To achieve these goals, wave-plate demisters are designed with a series of parallel and tortuously narrow channels between the shaped plates.…”

Section: Introductionmentioning

confidence: 99%

“…In addition to the compound demisters, demisters with specialized material like porous silicon carbide foam layers have demonstrated promising characteristics that can be employed in improving the flow behaviour of multi-phase in the demister and thus boost the droplets deriving from the air stream. [2] Although several techniques can be used to measure the amount and size distribution of droplets emitted, it is usually costly and time-consuming. [15][16][17] Thus, most of these experiments are implemented on simplified wet cooling towers, which results in a limited range of applicability.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental and numerical evaluation of the performances of type‐C and three‐segment demisters used in cooling towers

et al. 2021

Can J Chem Eng

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Demisters have become a key vapour‐liquid separation device for eliminating mist and preventing any escape of liquid droplets from cooling towers. In this paper, the overall performances of two types of demisters, namely type‐C and three‐segment demisters, are systematically investigated by using both experimental and numerical methods. The validation results show that the numerical results agree well with experimental data. On this basis, the underlying influences of key operating parameters, such as the circulating pressure of the pump, spray water flow rate, inlet gas velocity, and droplet size on the overall performance, are revealed. The results show that the overall separation efficiency is more sensitive to the gas velocity and increasing the gas velocity leads to two distinct declining stages of the overall separation efficiency for both demisters. The first stage appears due to the competition between the drag force and the inertial/centrifugal forces, while the next stage arises mainly due to the droplet re‐entrainment. The geometric design of the type‐C demister is more conducive to the separation of the fine droplets due to the presence of the hook plate, even at a relatively low gas velocity. Besides, the type‐C demister has more potential to reduce the power consumption while achieving a higher profit for a given grade separation efficiency.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental and numerical evaluation of the performances of type‐C and three‐segment demisters used in cooling towers

et al. 2021

Can J Chem Eng

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“…Kavousi and Venkatesan optimized drainage channel size and proposed the best match between drainage channels and runner structures [9,10]. Xu et al added a thin layer of porous structure on the inner plate wall, which intercepts small droplets and has a stabilizing effect on the liquid film on the wave-plate wall [11].…”

Section: Introductionmentioning

confidence: 99%

Design and performance measurement of wave-plate mist eliminator with microstructural feature plate surface

Ma¹,

Ji²

2019

Desalination and Water Treatment

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Wave-plate mist eliminators are widely used to remove airflow droplets in industrial processes. However, with an increase of the gas velocity, a negative impact from re-entrainment becomes obvious and energy consumption from mist eliminator becomes too high. To resolve these problems, a new kind of wave-plate mist eliminator with microstructural features added on the surfaces of wave-plates, is proposed. The effects of microstructural features (triangular, trapezoidal, and square columnar) on mist eliminator drainage performance are experimentally investigated. The separation efficiency and pressure drop of wave-plate mist eliminator are compared and analyzed. The influence of key microstructural dimensional parameters, including microcolumn unit width, circumference center distance spacing, and height, on mist eliminator performance is evaluated. The results indicate that microstructural features significantly increase droplet contact angles on wave-plate surfaces and enhance surface hydrophobicity. The separation efficiency of wave-plate mist eliminator with microstructural features is improved at high gas velocity. The pressure drop of wave-plate mist eliminator with microstructural features is only approximately one-third of pressure drop of a conventional mist eliminator with drainage channels. The three key structural parameters of microcolumn units have a comprehensive effect on mist eliminator performance.

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“…They used the experimental results to validate the theoretical and CFD models. Xu et al (2017) experimentally characterized a novel wave-plate eliminator using porous foam layers as enhanced structure proposed by the authors. They investigated the eect of some geometry parameters on separation eciency and pressure drop and developed correlations to predict the eliminator performance.…”

mentioning

confidence: 99%

Experimental study on pressure loss and collection efficiency of drift eliminators

Ramírez

Cutillas

Kaiser

et al. 2019

Applied Thermal Engineering

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Drift eliminators play a major role in cooling tower operation. They are designed to reduce the discharge aerosols in their exhaust air stream to a minimum since inhaled airborne particles can cause the well-known Legionnaires disease. However, the pressure drop induced into the air stream increases the power consumption of the system. Accordingly, the design and selection of these elements should be a trade-o between the pressure drop and the collection eciency. In this paper, six commercial drift eliminators (vane, wire mesh, and honeycomb-type) have been characterized in terms of pressure drop and collection eciency with the aim of providing reliable information that can be used in drift eliminator design and selection. Fifty three experiments were conducted regarding the pressure drop and collection eciency characterization of the eliminators. Generally speaking, for the same type of eliminators the higher the pressure drop, the more ecient it is. Concerning typologies, wire-mesh eliminators perform better than the rest in terms of both pressure drop and collection eciency. Dimensionless correlations for the pressure drop coecient and the collection eciency have been developed for the tested eliminators, showing a good agreement with the experimental results. A selection criterion has been proposed based on the dimensionless parameters that govern the problem and the experimental data of power consumption. It is based on determining the power consumed by the fans of the tower by setting a limit of collection eciency and the droplet distribution characteristics at the cooling tower outlet area.

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Study on performance of wave-plate mist eliminator with porous foam layer as enhanced structure. Part II: Experiments

Cited by 21 publications

References 16 publications

Experimental and numerical evaluation of the performances of type‐C and three‐segment demisters used in cooling towers

Experimental and numerical evaluation of the performances of type‐C and three‐segment demisters used in cooling towers

Design and performance measurement of wave-plate mist eliminator with microstructural feature plate surface

Experimental study on pressure loss and collection efficiency of drift eliminators

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