Impact of bubble coalescence on separation performance of a degassing hydrocyclone

Xu, Xiahong; Yang, Qiang; Wang, Chaoyang; Wang, Hualin

doi:10.1016/j.seppur.2015.07.058

Cited by 18 publications

(2 citation statements)

References 25 publications

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“…A degassing hydrocyclone with tangential inlets was reported by Xu et al 10 In this apparatus, the gas is treated as a dispersed phase in the continuous liquid phase. The results of multiple-size group models for degassing hydrocyclones show that the coalescence among bubbles and the pressure drop characteristics can be described by a turbulence model.…”

Section: Introductionmentioning

confidence: 99%

Bubble‐separation dynamics in a planar cyclone: Experiments and CFD simulations

Qian

et al. 2018

AIChE Journal

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A planar cyclone is designed for visualizing bubbles in the cross‐section of a degassing hydrocyclone. The pressure distribution is studied through a series of experiments and Reynolds stress model simulations. The velocity distribution of the planar cyclone mostly exhibits the quasi‐forced vortex zone and boundary layer zone. The bubble dynamics are simulated using both Euler‐Euler and Euler‐Lagrange approaches, and the output is compared with the imaging results. The Euler‐Euler simulation provides more accurate predictions of the bubble trajectory. The histograms of residence time and traveling distance given by the Euler‐Lagrange approach exhibit a reasonably regular pattern. With higher values of the inlet Reynolds number, stronger forces acting on the bubbles lead to a decreased but more uniform residence time. © 2018 American Institute of Chemical Engineers AIChE J, 64: 2689–2701, 2018

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Section: Introductionmentioning

confidence: 99%

Bubble‐separation dynamics in a planar cyclone: Experiments and CFD simulations

Qian

et al. 2018

AIChE Journal

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“…The planar cyclone is an evolution of the degassing hydrocyclone . Extant studies have focused on bubble separation from liquids through the action of the centrifugal force and pressure gradients in swirling flows . The bubbles dynamics is accompanied by the separation of dissolved gas because of the gas stripping which is important in the exact prediction of swirling flow behaviors.…”

Section: Introductionmentioning

confidence: 99%

Gas–liquid mass transfer and bubble size distribution in a multi‐Cyclone separator

Qian

et al. 2018

AIChE Journal

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This article discusses the use of a multi-cyclone separator, which is a simplified form of a degassing hydrocyclone, in the separation of sweeping nitrogen bubbles and dissolved oxygen from water. The motion of the nitrogen bubbles and mass transfer of dissolved oxygen is discussed. It was observed that the Sauter mean diameter and gas volume in the swirling flow region as well as the total gas holdup increased as the volumetric ratio of gas to liquid flow increased. Almost all bubbles were found to exit through the gas outlet, indicating optimum performance of the bubble-separation process. The multi-cyclone separator was found to achieve good performance for the mass transfer of oxygen from water to nitrogen. This work is important in predicting the destination of bubbles and dissolved gas in swirling flow.

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Optimizing CO₂ Purification in a Negative CO₂ Emission Power Plant

Amiri,

Mikielewicz,

Ziółkowski

et al. 2024

Chem Eng & Technol

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In the pursuit of mitigating CO2 emissions, this study investigates the optimization of CO2 purification within a negative CO2 emission power plant using a spray ejector condenser (SEC) coupled with a separator. The approach involves direct‐contact condensation of vapor, primarily composed of an inert gas (CO2), facilitated by a subcooled liquid spray. A comprehensive analysis is presented, employing a numerical model to simulate a cyclone separator under various SEC outlet conditions. Methodologically, the simulation, conducted in Fluent, encompasses three‐dimensional, transient, and turbulent characteristics using the Reynolds stress model turbulent model and mixture model to replicate the turbulent two‐phase flow within a gas–liquid separator. Structural considerations are delved into, evaluating the efficacy of single‐ and dual‐inlet separators to enhance CO2 purification efficiency. The study reveals significant insights into the optimization process, highlighting a notable enhancement in separation efficiency within the dual‐inlet cyclone, compared to its single inlet counterpart. Specifically, a 90.7 % separation efficiency is observed in the former, characterized by symmetrical flow patterns devoid of wavering CO2 cores, whereas the latter exhibits less desirable velocity vectors. Furthermore, the investigation explores the influence of key parameters, such as liquid volume fraction (LVF) and water droplet diameter, on separation efficiency. It is ascertained that a 10 % LVF with a water droplet diameter of 10 µm yields the highest separation efficiency at 90.7 %, whereas a 20 % LVF with a water droplet diameter of 1 µm results in a reduced efficiency of 50.79 %. Moreover, the impact of structural modifications, such as the addition of vanes, on separation efficiency and pressure drop is explored. Remarkably, the incorporation of vanes leads to a 9.2 % improvement in separation efficiency and a 16.8 % reduction in pressure drop at a 10 % LVF. The findings underscore the significance of structural considerations and parameter optimization in advancing CO2 capture technologies, with implications for sustainable energy production and environmental conservation.

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Impact of bubble coalescence on separation performance of a degassing hydrocyclone

Cited by 18 publications

References 25 publications

Bubble‐separation dynamics in a planar cyclone: Experiments and CFD simulations

Bubble‐separation dynamics in a planar cyclone: Experiments and CFD simulations

Gas–liquid mass transfer and bubble size distribution in a multi‐Cyclone separator

Optimizing CO₂ Purification in a Negative CO₂ Emission Power Plant

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Impact of bubble coalescence on separation performance of a degassing hydrocyclone

Cited by 18 publications

References 25 publications

Bubble‐separation dynamics in a planar cyclone: Experiments and CFD simulations

Bubble‐separation dynamics in a planar cyclone: Experiments and CFD simulations

Gas–liquid mass transfer and bubble size distribution in a multi‐Cyclone separator

Optimizing CO2 Purification in a Negative CO2 Emission Power Plant

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Product

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About

Optimizing CO₂ Purification in a Negative CO₂ Emission Power Plant