An experiment investigation of particle collection efficiency in a fixed valve tray washing column

Wang, Qingli; Chen, Xueli; Guo, Zhiguo; Gong, Xinglong

doi:10.1016/j.powtec.2013.12.044

Cited by 10 publications

(6 citation statements)

References 24 publications

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“…Less important mechanisms of dust capture include diffusion and interception and empirical relations for the collection efficiency due to these mechanisms were reported by Wang et al These mechanisms were not taken into account in the current simulations as they only play a significant impact on collection of extremely small particles (<1 µm) and centrifugal scrubbers are not widely used for collecting such small particles. Note that in applications which make use of wet centrifugal scrubbers, the mean inlet dust particle size is usually greater than 10 µm and inertial impaction is responsible for collection of virtually all the particles…”

Section: Introductionmentioning

confidence: 90%

Numerical prediction of dust capture efficiency of a centrifugal wet scrubber

2017

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The gas, liquid, and dust particle behavior inside a centrifugal wet scrubber was simulated and a submodel for predicting its collection efficiency was developed that also takes in account the reduction in collection efficiency due to droplet carryover. Centrifugal wet scrubbers are used in many industries and deliver a high scrubbing efficiency at relatively low capital and operational costs. However, they often experience problems such as droplet carryover at high gas flows and reduced collection efficiency at low gas flows. An improved understanding of flow processes inside the scrubbers is needed to develop a better scrubber design. An experimental test facility was setup for this purpose which also served to validate the CFD modeling results. Ideal operating parameters for maximum scrubbing efficiency and minimum droplet carryover were identified. © 2017 American Institute of Chemical Engineers AIChE J, 64: 1001–1012, 2018

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Section: Introductionmentioning

confidence: 90%

Numerical prediction of dust capture efficiency of a centrifugal wet scrubber

2017

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“…Such dependence of DF on particle number density has scarcely been reported in literatures. Only a few results can be found for pool scrubbing [4,5] or wet scrubbing in non-pool geometry [6].…”

Section: Introductionmentioning

confidence: 99%

The dependence of pool scrubbing decontamination factor on particle number density: modeling based on bubble mass and energy balances

Sun

Sibamoto

Hirose

et al. 2021

Journal of Nuclear Science and Technology

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Pool scrubbing is one of the promising means for mitigating radioactive aerosol release into the environment in nuclear severe accident scenarios. The influence of operational conditions on its performance is therefore of much interest. This paper focuses on the influence of particle number density found in our experiments. The experiments, conducted for insoluble monodispersed (0.5 µm) particles, indicated a sharp decrease in the decontamination factor (DF) for inlet number densities higher than ~1 × 10 11 m −3 . A model is proposed based on a hypothesis that particle removal becomes inefficient at high number densities because particle condensational growth is limited by the depletion of vapor supersaturation in rising bubbles. The model calculates the magnitude of supersaturation from the bubble mass and energy balances considering the condensational vapor consumption and heat addition by all particles in the bubble, where the rate of condensation on each particle is dependent on supersaturation. The particle size, condensationally growing with time, is then used in the calculation of centrifugal particle removal. It is shown that the model reproduces qualitatively the experimental dependence of DF on particle number density, providing further proof that such dependence is a physical reality deserving attention in the evaluation of pool scrubbing performance.

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“…In the opposed multiburner gasification purification system, the washing column is used to deeply purify the high-temperature syngas. ,, After the particle-laden gas rises in counterflow to the water layer on the tray, the airborne particles will be dispersed into bubbles, transported to the bubble surface, and collide on it. The impact of micron particles on the bubble surface is one of the control steps of the separation process.…”

Section: Introductionmentioning

confidence: 99%

Impact Behavior of Hydrophilic Micron Particles on a Planar Gas–Liquid Interface

et al. 2019

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The behavior of hydrophilic micron particles impacting on the gas−liquid interface has been further experimentally studied using a high-speed camera at different surface tensions and dynamic viscosities of liquids. The results show that the impact behavior exhibits suspension and submergence modes, whose boundary cannot be clearly identified because the overlap between the impact velocity ranges occurs because of the unstable pinning of the three-phase contact line on the surface of hydrophilic particles. The liquid properties have little effect on the wettability of hydrophilic particles but greatly influence the hydrodynamic and capillary force exerted on the particles, leading to the expansion of the suspension mode range. In addition, the penetration probability changes little with the decrease in surface tension, while it significantly reduces with the increase in dynamic viscosity. A penetration probability model is predicted as an exponential function of the inertial and supporting forces, and the experimental values agree well with the predicted values. The outcomes of this research will be helpful for understanding the mechanism of particle−interface interaction and providing guidance for enhancing the separation of hydrophilic fine ash via a bubble scrubbing system.

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An experiment investigation of particle collection efficiency in a fixed valve tray washing column

Cited by 10 publications

References 24 publications

Numerical prediction of dust capture efficiency of a centrifugal wet scrubber

Numerical prediction of dust capture efficiency of a centrifugal wet scrubber

The dependence of pool scrubbing decontamination factor on particle number density: modeling based on bubble mass and energy balances

Impact Behavior of Hydrophilic Micron Particles on a Planar Gas–Liquid Interface

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