Improvement of tar removal performance of oil scrubber by producing syngas microbubbles

Unyaphan, Siriwat; Tarnpradab, Thanyawan; Takahashi, Fumio; Yoshikawa, Kunio

doi:10.1016/j.apenergy.2017.08.071

Cited by 28 publications

(16 citation statements)

References 29 publications

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“…The throat diameter and divergent angle play key roles in determination of the performance of a Venturi-type bubble generator. Unyaphan et al (2017) designed three Venturi tubes with the fixed inlet and outlet diameters (D = 12 mm) but different throat diameters (d = 2, 5, and 8 mm). Considering that bubble coalescence led to the increase of the final bubble size in the case of d = 2 mm, the Venturi tube with a throat diameter of 5 mm (corresponding to the throat ratio d/D = 0.42) produced the smallest bubble with average diameter of 197 μm at the velocity of 5.6 m/s in the throat.…”

Section: Effects Of Geometric Parametersmentioning

confidence: 99%

A review on bubble generation and transportation in Venturi-type bubble generators

Huang

Sun

Liu

et al. 2019

Exp. Comput. Multiph. Flow

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Venturi-type bubble generators own advantages of simplicity in structure, high efficiency, low power consumption, and high reliability, exhibiting a broad application potential in various fields. This work presents a literature review of recent progress in the research concerning Venturi-type bubble generators, with a focus on the performance evaluation, bubble transportation, and breakup mechanisms. Experimental studies employing flow visualization techniques have played an important role in exploring the bubble transportation and breakup phenomena, which is vitally necessary for clarifying the bubble breakup mechanisms and understanding the working principle and performance of a Venturi channel as a bubble generator. A summarization was carried out on both experimental and theoretical work concerning parameters influencing the bubble breakup and the performance of Venturi-type bubble generators. Based on the geometric parameter optimization combined with appropriate flow conditions, it is expected that Venturi-type bubble generators can produce bubbles with controllable size and concentration to satisfy the application requirements, while a further work is required to illustrate the interaction between the liquid and gas bubbles.

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Section: Effects Of Geometric Parametersmentioning

confidence: 99%

A review on bubble generation and transportation in Venturi-type bubble generators

Huang

Sun

Liu

et al. 2019

Exp. Comput. Multiph. Flow

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“…Their main conclusion is that throat length/throat diameter ratio and diverging angle play key roles in determination of the performance of a Venturi-type bubble generator. For the l/d ratio, the results from Reichmann et al [9] and Huang et al [10] showed that bubble diameter reduced with higher l/d ratio while the results from Unyaphan et al [18] did not support this conclusion. For the diverging angle, Lee et al [19] and compared the bubble diameter produced from five Venturi tubes with different diverging angles in the range of 15 • -45 • .…”

Section: The Effect Of Geometrical Parameters On Average Bubble Diameter and Bubble Diameter Distributionmentioning

confidence: 93%

Section: The Effect Of Geometrical Parameters On Average Bubble Diameter and Bubble Diameter Distributionmentioning

confidence: 93%

Geometrical Optimization of a Venturi-Type Microbubble Generator Using CFD Simulation and Experimental Measurements

Wilson

Pun

Ganesan

et al. 2021

Designs

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Microbubble generators are of considerable importance to a range of scientific fields from use in aquaculture and engineering to medical applications. This is due to the fact the amount of sea life in the water is proportional to the amount of oxygen in it. In this paper, experimental measurements and computational Fluid Dynamics (CFD) simulation are performed for three water flow rates and three with three different air flow rates. The experimental data presented in the paper are used to validate the CFD model. Then, the CFD model is used to study the effect of diverging angle and throat length/throat diameter ratio on the size of the microbubble produced by the Venturi-type microbubble generator. The experimental results showed that increasing water flow rate and reducing the air flow rate produces smaller microbubbles. The prediction from the CFD results indicated that throat length/throat diameter ratio and diffuser divergent angle have a small effect on bubble diameter distribution and average bubble diameter for the range of the throat water velocities used in this study.

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“…In a water treatment process [11] microbubble with less than 58 µm diameter increased the total mass transfer of ozone and gave higher concentrations of dissolved ozone than a bubble contactor. Moreover, [12] applied microbubble to improve tar removal. A venturi scrubber that can generate microbubble provided an increased absorption surface area and a tar removal efficiency of about 97.7 %.…”

Section: Introductionmentioning

confidence: 99%

Biogas Upgrading to Biomethane by CO2 Removal using Water Absorber with Microbubble Technique

Dumruangsri

Pongyeela

Chungsiriporn

2021

Walailak J Sci & Tech

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Biogas upgraded to biomethane can be utilized as a renewable energy source to substitute LPG in households and industry. This study explored biogas upgrading by CO2 removal from 20 - 75 % CO2-N2 simulated biogas mixture. The experimental unit using the microbubble technique combined with the water absorption column was set up and used for CO2 removal from the gas. Microbubble sizes of 20 - 30 µm were generated by a venturi ejector and measured with an automated bubble size measurement. The experiments confirmed that a microbubble with an inline mixer could enhance the effectiveness of the absorption process. The tests demonstrated over 85.80 % removal of CO2 from the simulated biogas by the experimental unit. The effects of various parameters, including the size of venturi ejector, gas flow rate, water flow rate, liquid-gas ratio, and initial concentration of CO2, were investigated. The results revealed that 2 L/min gas flow rate, 15 L/min water flow rate, L/G ratio 7.5, and venturi ejector size 0.50 inches are the optimum conditions. The use of the tube absorber gave much higher CH4 recovery than an absorption column. The appropriate operating conditions gave over 96 % CH4 concentration or less than 4 % CO2 concentration, matching the CH4 purity required by biomethane specifications. The results indicated that the new technique demonstrated in this study can upgrade biogas to biomethane.

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Improvement of tar removal performance of oil scrubber by producing syngas microbubbles

Cited by 28 publications

References 29 publications

A review on bubble generation and transportation in Venturi-type bubble generators

A review on bubble generation and transportation in Venturi-type bubble generators

Geometrical Optimization of a Venturi-Type Microbubble Generator Using CFD Simulation and Experimental Measurements

Biogas Upgrading to Biomethane by CO2 Removal using Water Absorber with Microbubble Technique

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