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Optimal design of gas distributor in fluidized bed for synthesis of silicone monomer

Particuology 2023年第12期83卷 115-128页

作者： Shanlin Du Guoqiang Lv Wenhui Ma Guangkai Gu Boqiang Fu Faculty of Metallurgical and Energy Engineering Kunming University of Science and TechnologyKunming650093China State Key Laboratory of Complex Nonferrous Metal Resources Cleaning Utilization in Yunnan Province Kunming650093China

The structure of the gas distributor is closely related to the production efficiency of organosilicon monomers.To improve the production efficiency of organosilicon monomers,this study uses Eulerian-Eulerian two fluid model and proposes a design formula for the gas distributor to optimize the gas distributor.It is proposed that the pressure drop of the gas distributor,the velocity nonuniformity coefficient,the relative standard deviation of the solid holdup,and the solid particle dispersion coefficient are used to evaluate the performance of the gas distributor.The results show that the performance of the gas distributor is significantly improved when the opening ratioΦ=0.53%is optimized toΦ=0.18%,in which the relative standard deviation of the solid holdup is reduced by 22%,and the solid particle dispersion coefficient is reduced by 40%.On this basis,this article studies the influence of different arrangements of vent holes on gas-solid fluidization characteristics.The results show that the circular arrangement of vent holes is helpful to the mixing of gas and solid.

关键词： Fluidizedbed reactor gas distributor Opening ratio Arrangement

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Effect of gas distributor Structure on Fluidization Characteristics in a gas-Solid Fluidized Bed

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China Petroleum Processing & Petrochemical Technology 2020年第2期22卷 102-110页

作者： Jang Kwangbyol Feng Yali Li Haoran School of Civil&Resource Engineering University of Science and Technology BeijingBeijing 100083 National Key Laboratory of Biochemical Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100080

In the present paper,the experimental method and computational fluid dynamics(CFD)method were used to investigate the effect of gas distributors with different orifice sizes and orifice pitches on fluidization characteristics in a gas-solid fluidized bed.The Euler-Euler two fluid model(TFM)approach based on the kinetic theory of granular flow(KTGF)and the standard k-epsilon turbulence model was employed in the numerical simulation by using ANSYS Fluent 15.0.The results showed that the orifice size and the orifice pitch of gas distributor had a significant influence on the flow characteristics in the gas-solid fluidized bed.With a decreasing orifice size and orifice pitch of gas distributor having the same opening area,the distributor pressure drop,the initial bubble size,and the height of dead zone just above the distributor were decreased,and the bed pressure drop was increased more than that of the larger orifice size and orifice pitch of distributors,the distribution of solid volume fraction was also more homogeneous for the smaller orifice size.

关键词： fluidized bed gas distributor orifice size bubble numerical simulation

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Optimal Design of Two-Chamber gas distributor with CFD Approach

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Journal of Harbin Institute of Technology(New Series) 2015年第2期22卷 79-85页

作者： Dongfang Zhao Fengguo Liu Xueyi You Xinhua Wang School of Energy and Safety Engineering Tianjin Chengjian University School of Environmental Science and Engineering Tianjin University Tianjin Urban Construction Management and Vocational Technology College

Computational fluid dynamics( CFD) is used to investigate a new type of two-chamber natural gas distributor,which has a natural gas inlet and nine nozzle outlets. The uniformity at the outlet of distributor is practice proven to have significant degree influence on its comprehensive performance. To improve the uniformity at the nozzles of the gas distributor,CFD modeling with the RNG k-ε turbulence model is undertaken to understand the mass flow rate of nozzles with reference to different length of chambers and the most optimal length is obtained. The internal flow pattern of the natural gas distributor is analyzed. It is found that the local maximum deviation of the nozzle outflow rate increases with the increase of chambers length when the length is more than 64 mm. The results provide useful suggestions for the optimal design of two-chamber natural gas distributor.

关键词： gas distributor two-chamber CFD uniformity nozzle mass flow rate

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Effects of internals and distributors on the distribution and growth of bubbles in the conventional gas-solid fluidized bed

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Particuology 2021年第2期19卷 1-15页

作者： Haidong Zhang Zeneng Sun Chengguo Liu Shurui Dong Yuanyuan Shao Jesse Zhu Collaborative Innovation Center of Chemical Science and Engineering(Tianjin) School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072PR China Particle Technology Research Centre Department of Chemical&Biochemical EngineeringThe University of Western OntarioLondonOntario N6A 5B9Canada

The effects of internals and gas distributors on the local dynamics of the bubbles in the conventional gas-solid fluidized bed were studied.Mesh-type internals with different opening areas(50%,70%and 90%)and different arrangements(two-layer and four-layer);and a sintered plate with a smaller pore size(1μm)and a perforated plate with a larger pore size as distributors were investigated.Differential pressure drops and local solids holdups were measured under various superficial gas velocities to compare the performances of the different types of internals and distributors.The instantaneous solids holdup signals from the optical fibre probe were used to further examine the local bubble dynamics in detail.Smaller bubbles were found,with the installation of internals or using the sintered plate,resulting in lower pressure drops and a higher bed expansion.Internals with reduced opening area or distributor with smaller pore size further leads to a higher changeover rate between the bubbles and dense phase,both axially and radially,and hence a better gas-solid contacting and an earlier transition to the turbulent flow regime of the bed.

关键词： gas-solid fluidized bed Internal gas distributor Bubble dynamics Flow regime transition

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NUMERICAL SIMULATION OF gas-LIQUID FLOW IN AN AIRLIFT LOOP REACTOR

NUMERICAL SIMULATION OF GAS-LIQUID FLOW IN AN AIRLIFT LOOP R...

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多相流研究进展国际会议

作者： J.Wang Y.Mao H.JiangDepartment of Chemical Engineering University of Petroleum Beijing 102249 China

＜正＞ In the present paper, a full-scale numerical simulation of an airlift loop reactor with gas distributor was carried out. The standard κ-εturbulence model and Euler multiphase flow model were used to simulate gas-liquid two-phase turbulent flow in the reactor. All details of gas hold up and velocities distribution anywhere in the reactor were obtained. It was confirmed that the flow inside of draft tube was not plug flow. Eddies and reversed flow were found in it. They affect greatly gas hold up distribution and the contact of gas and liquid, which influence the reacting process. The computing results were compared with experimental data on global gas hold up and the agreement was found rather satisfactory.

关键词： loop reactor gas distributor numerical simulation gas hold up

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