Gas distribution characteristics for heterogeneous flows in the slender particle-containing scrubbing–cooling chamber of an entrained-flow gasifier

Peng, Xin; Wang, Yifei; Wei, Zongyao; Yu, Guangsuo

doi:10.1016/j.cherd.2018.05.038

Cited by 8 publications

(12 citation statements)

References 60 publications

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“…However, the mean bubble velocity in a 0.01% fiber volume fraction slightly increased in region 3. Because the hydrophobicity of the nylon fiber is poor, 12 the long effective range of hydrophobic interactions will enhance the adhesion between bubbles and fibers. 35 Furthermore, more bubbles will be attached to the fibers, which accelerates the movement of the fiber-bubble agglomerate.…”

Section: Resultsmentioning

confidence: 99%

“…As shown in Figure 7a, the interfacial areas show central and wall peak distributions at low and high superficial gas velocities, respectively. At a low superficial gas velocity, the gas mainly flows upward along the outer wall of the downcomer 12 which results in the small radial diffusion. As shown in Figure 7a, most of the bubble diameters are larger than 6 mm and few of them are between 5 and 6 mm.…”

Section: Resultsmentioning

confidence: 99%

“…The three scaling-up criteria we used in this study were proposed by Wilkinson et al 16 The critical value of the dimensionless diameter, D H *, in criterion 1 we adopted in this study is the same with those in our previous studies. 12,13 The D H,Cr * should be no less than 30 (D H,Cr * ≥ 30), which was proposed by Kataoka and Ishii 58 (this critical value was also adopted by Pagan et al 59 ). It is slightly different from that of the D H,Cr * ≥ 52 proposed by Wilkinson et al We also notice that some researchers also defined this critical value as 40, such as Schlegel et al 60 In this study, the upper part of the scrubbing−cooling chamber is an annular bubbling bed.…”

Section: Introductionmentioning

confidence: 99%

“…The drag coefficient of nonspherical particles is remarkably different from that of the spherical particles, which inevitably affects the fluid movement and distribution characteristics . In our previous studies, , gas distribution characteristics in a scrubbing–cooling chamber containing slender particles have been studied. Local and global gas holdup models were proposed and a local flow regime map was obtained.…”

Section: Introductionmentioning

confidence: 99%

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Local Distributions of Bubble Velocity and Interfacial Area in the Slender Particle-Containing Scrubbing–Cooling Chamber of an Entrained-Flow Gasifier

Zhao

Peng

Wang

et al. 2020

Ind. Eng. Chem. Res.

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Radial bubble velocities, chord lengths, and local gas holdups were measured by a dual-tip conductivity probe in a slender particle-containing scrubbing–cooling chamber. The annulus region of the bubbling bed was divided into three regions according to the radial distributions of bubble velocity, bubble size, and local gas holdup. Bubble velocity distributions were obtained by the kernel density estimation, and the relationships between mean bubble velocity and diameter were discussed. The interfacial area was calculated by the size distribution of total bubbles in the bed which was transformed from that of total bubbles touching the probe by an analytical transformation method. Effects of superficial gas velocity, fiber volume fraction, and aspect ratio on the distributions of bubble velocity and interfacial area were discussed. The experimental interfacial area values were in good agreement with the calculated ones obtained by the modified Besagni and Inzoli correlation.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Local Distributions of Bubble Velocity and Interfacial Area in the Slender Particle-Containing Scrubbing–Cooling Chamber of an Entrained-Flow Gasifier

Zhao

Peng

Wang

et al. 2020

Ind. Eng. Chem. Res.

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“…The BVW-2 bubble parameter measuring instrument is used for local gas content and bubble characteristic parameter measurement. As shown in Figure a, the tip of the conductivity probe consists of two stainless steel wires with a diameter of 0.25 mm, and the rest of the probe is fixed in a metal sleeve to enhance the mechanical strength, thus facilitating the use of the probe . The diameter of the measuring end of the probe is 5 mm, and the length of the measuring section is 500 mm.…”

Section: Methodsmentioning

confidence: 99%

Prediction of Bubble Size Distribution above the Bubble-Breaking Plate

Wang

Zeng

et al. 2023

Ind. Eng. Chem. Res.

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The chord length distribution (CLD) of bubbles in the region above the bubble-breaking plate in the scrubbing−cooling chamber was studied experimentally using a conductivity probe. The predictive correlations of the shape parameters were established by fitting the CLD with a distribution function. The bubble shape was discussed, and the CLD was analytically converted to the size distribution of the direct contact of the probe. The results showed that the CLD has specific right-skewed characteristics, and the Rayleigh distribution has the best-fitting effect on the CLD. The correlation equation of the shape parameter k of the Rayleigh distribution concerning the Fr number, local gas holdup ε g , and dimensionless radius r/R was established. The predicted bubble size distributions (BSDs) based on ellipsoids are in good morphological agreement with the experimental size distributions. The relative error between the calculated and experimental values of the gas−liquid interface area was within ±20%, which verified the accuracy of the prediction of the BSD.

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An experimental and numerical investigation of the three‐phase flow in the washing chamber of an entrained flow gasifier

Pan

Liu

et al. 2021

Can J Chem Eng

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This study established a cold experimental platform and a mathematical model to examine the gas-liquid-solid three-phase flow in the washing process of the gas-solid flow as it passes through a liquid pool in an entrained flow coal gasifier. It visualized the three-phase flow process and separation of the solid particles, including the bubble motion and particle separation processes. The concentration distribution and separation efficiency of the particles were quantitatively analyzed considering various major influencing factors. The particle separation mechanism was analyzed based on the characteristics of the threephase flow, and the results confirm that a multi-peak distribution of particle concentration exists in the liquid pool along the axial and radial directions.There is considerable variation in peak particle concentration points with different particle sizes; as particle size increases, the particle separation efficiency also rises. Based on the calculation conditions in this study, the separation efficiencies obtained with particle diameters of 50, 20, and 10 μm were 96.98%, 94.48%, and 87.31%, respectively.

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Gas distribution characteristics for heterogeneous flows in the slender particle-containing scrubbing–cooling chamber of an entrained-flow gasifier

Cited by 8 publications

References 60 publications

Local Distributions of Bubble Velocity and Interfacial Area in the Slender Particle-Containing Scrubbing–Cooling Chamber of an Entrained-Flow Gasifier

Local Distributions of Bubble Velocity and Interfacial Area in the Slender Particle-Containing Scrubbing–Cooling Chamber of an Entrained-Flow Gasifier

Prediction of Bubble Size Distribution above the Bubble-Breaking Plate

An experimental and numerical investigation of the three‐phase flow in the washing chamber of an entrained flow gasifier

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