Modelling mass transfer in gas‐liquid two‐phase flow in a jet zone loop reactor

Heithoff, Susanne; Kück, Ulf Daniel; Volkmer, Pascal; Räbiger, Norbert; Fritsching, Udo

doi:10.1002/cjce.22660

Cited by 6 publications

(4 citation statements)

References 17 publications

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“…The EDM measurement principle is described in . The particle grid investigations are performed in a flow channel with 0.1 m in diameter and 2.5 m in height according to . The EDM only resolves data at a single location but with complete temporal resolution.…”

Section: Methodsmentioning

confidence: 99%

Emulation of Bubble‐Induced Turbulence Using Randomly Moving Particles in a Grid Structure

et al. 2017

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An approach to generate turbulence with systematically controllable properties and statistically comparable to real bubble-induced turbulence is evaluated. Particles are arranged in a flexible regular grid and can move freely in the directions perpendicular to the flow direction. The flow induced by different grid configurations is characterized by particle image velocimetry and electrodiffusion measurement. With these techniques, spatially resolved velocity fields and time-resolved energy spectra are achieved. Homogeneous turbulence with the intensity comparable to regular bubble flow is obtained downstream from the particle grid. The energy spectra of these emulated turbulent flows agree with the energy spectra of real bubble-induced turbulence. The proposed concept of turbulence generation is suitable for detailed scientific investigations of bubbles in turbulent flows using sophisticated optical measurement techniques.

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Section: Methodsmentioning

confidence: 99%

Emulation of Bubble‐Induced Turbulence Using Randomly Moving Particles in a Grid Structure

et al. 2017

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“…The step size is

Δ r = 1 cm.

The EDM is a polarographic measurement cell where the measured liquid velocity is proportional to a diffusion limited electrode reaction. A detailed description of the EDM is given by Pannek et al and Heithoff et al…”

Section: Methodsmentioning

confidence: 99%

Modelling gas‐liquid mass transfer in a two‐phase jet flow

et al. 2018

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The efficiency and selectivity of chemical reactions are influenced by the mixing characteristic of the reactor. Existing models for reactor precalculation are often based on mean values, e.g. for the energy dissipation rate or the volumetric mass transfer coefficient, and assume a homogeneous mass transfer behaviour. As a result, process optimization by avoiding mass transfer limitations is not efficient, due to the missing knowledge of local limitations. Jet reactors typically provide inhomogeneous mixing and mass transfer behaviour, where the highest rates occur in the jet vicinity. Hence, the mass transfer processes in the jet flow, which cannot be properly characterized in gas‐liquid two‐phase flow, dominate the reactor performance. Experimental results concerning the volumetric mass transfer coefficient in the jet vicinity of the Jetzone‐Loopreactor are discussed, and a model approach for describing the phenomenon is presented. It is shown that the mass transfer rates strongly depend on the hydrodynamics of the loop flow. The normalknormalLa model is adapted to the loop flow determining mechanisms, the drag coefficient, and the density difference between the circulation and the jet flow.

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“…The design of the jet-zone loop reactor corresponds to that from Heithoff et al [11]. The gas-liquid mixture enters the regenerator at the bottom through a nozzle, resulting in very fine air bubbles.…”

Section: Pilot Plantmentioning

confidence: 99%

Wet‐Oxidative Desulfurization as a Flexible and Greener Way for H₂S Removal from Acid Gases

Wurm,

Thielert,

von Morstein

et al. 2023

Chemie Ingenieur Technik

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In wet‐oxidative gas desulfurization processes, absorbed H2S is directly converted to sulfur by a redox catalyst dissolved in a circulating scrubbing solution. High flexibility is achieved through the availability of different catalyst classes. In this work, a process based on the Takahax process was investigated in a pilot plant under industrially relevant conditions with coke oven gas. A stable plant operation without sulfur precipitation was achieved by a suitable choice of the operating conditions. The solid‐free operating window was determined and a sulfur redissolution strategy developed.

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Modelling mass transfer in gas‐liquid two‐phase flow in a jet zone loop reactor

Cited by 6 publications

References 17 publications

Emulation of Bubble‐Induced Turbulence Using Randomly Moving Particles in a Grid Structure

Emulation of Bubble‐Induced Turbulence Using Randomly Moving Particles in a Grid Structure

Modelling gas‐liquid mass transfer in a two‐phase jet flow

Wet‐Oxidative Desulfurization as a Flexible and Greener Way for H₂S Removal from Acid Gases

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Modelling mass transfer in gas‐liquid two‐phase flow in a jet zone loop reactor

Cited by 6 publications

References 17 publications

Emulation of Bubble‐Induced Turbulence Using Randomly Moving Particles in a Grid Structure

Emulation of Bubble‐Induced Turbulence Using Randomly Moving Particles in a Grid Structure

Modelling gas‐liquid mass transfer in a two‐phase jet flow

Wet‐Oxidative Desulfurization as a Flexible and Greener Way for H2S Removal from Acid Gases

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Product

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Wet‐Oxidative Desulfurization as a Flexible and Greener Way for H₂S Removal from Acid Gases