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Abid KH, Mendil J, Al-Dahhan MH. Studying dispersed phase holdup in a pilot plant agitated liquid–liquid mixer by developing online expanded laser beam based technique. Chem Eng Sci 2022. [DOI: 10.1016/j.ces.2022.117461] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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2
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Ma Y, Liu M, Li C, Zhou X. Mesoscale model of radial hydrodynamics for fluidizing small particles with low solid holdup in gas-liquid-solid circulating fluidized bed. Chem Eng Sci 2022. [DOI: 10.1016/j.ces.2021.117413] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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3
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Li W, Zhou G, Sun J, Guo Y, Wang R. Impacts of Particle Properties on Gas Holdup under Four Flow Regimes in Three‐Phase Bubble Columns. Chem Eng Technol 2021. [DOI: 10.1002/ceat.202100291] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Weiling Li
- Southeast University Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and Environment 210096 Nanjing China
- Nanjing Normal University Jiangsu Provincial Key Laboratory of Materials Cycling and Pollution Control School of Energy and Mechanical Engineering 2 Xuelin road 210042 Nanjing China
| | - Genfu Zhou
- Water Conservancy and Flood Control Material Reserve Center of Jiangsu Province 210029 Nanjing China
| | - Jian Sun
- Nanjing Normal University Jiangsu Provincial Key Laboratory of Materials Cycling and Pollution Control School of Energy and Mechanical Engineering 2 Xuelin road 210042 Nanjing China
| | - Yafei Guo
- Nanjing Normal University Jiangsu Provincial Key Laboratory of Materials Cycling and Pollution Control School of Energy and Mechanical Engineering 2 Xuelin road 210042 Nanjing China
| | - Ruilin Wang
- Nanjing Normal University Jiangsu Provincial Key Laboratory of Materials Cycling and Pollution Control School of Energy and Mechanical Engineering 2 Xuelin road 210042 Nanjing China
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Li L, Zhao Y, Lian W, Han C, Zhang Q, Huang W. Review on the Effect of Gas Distributor on Flow Behavior and Reaction Performance of the Bubble/Slurry Reactors. Ind Eng Chem Res 2021. [DOI: 10.1021/acs.iecr.1c00609] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Le Li
- State Key Laboratory of Clean and Efficient Coal Utilization, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China
| | - Yansheng Zhao
- School of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China
| | - Wenhao Lian
- School of Chemical Engineering and Technology, North University of China, Taiyuan 030024, Shanxi, China
| | - Chun Han
- State Key Laboratory of Clean and Efficient Coal Utilization, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China
| | - Qian Zhang
- State Key Laboratory of Clean and Efficient Coal Utilization, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China
| | - Wei Huang
- State Key Laboratory of Clean and Efficient Coal Utilization, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China
- Taiyuan Coal Conversion Technology Engineering Co., Ltd. Taiyuan 030024, Shanxi, China
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Basha OM, Sehabiague L, Abdel-Wahab A, Morsi BI. Fischer–Tropsch Synthesis in Slurry Bubble Column Reactors: Experimental Investigations and Modeling – A Review. INTERNATIONAL JOURNAL OF CHEMICAL REACTOR ENGINEERING 2015. [DOI: 10.1515/ijcre-2014-0146] [Citation(s) in RCA: 56] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
This paper presents an extensive review of the kinetics, hydrodynamics, mass transfer, heat transfer and mathematical as well as computational fluid dynamics (CFD) modeling of Low-Temperature Tropsch Synthesis (LTFT) synthesis in Slurry Bubble Column Reactors (SBCRs), with the aim of identifying potential research and development areas in this particular field. The kinetic expressions developed for F-T synthesis over iron and cobalt catalysts along with the water gas shift (WGS) reactions are summarized and compared. The experimental data and empirical correlations to predict the hydrodynamics (gas holdup, Sauter mean bubble diameter, and bubble rise velocity), mass transfer coefficients and heat transfer coefficients are presented. The effects of various operating variables, including pressure, temperature, gas velocity, catalyst concentration, reactor geometry, and reactor internals on the hydrodynamic and transport parameters as well as the performance of SBCRs are discussed. Additionally, modeling efforts of SBCRs, using axial dispersion models (ADM), multiple cell recirculation models (MCCM) and computational fluid dynamics (CFD), are addressed. This review revealed the following:
(1)Numerous F-T and WGS kinetic rate expressions are available for cobalt and iron catalysts and one must be careful in selecting the appropriate expressions for LTFT. Iron catalyst suffers from severe attrition and subsequent deactivation in SBCRs and accordingly building a costly catalyst manufacturing facility onsite is required to maintain a steady operation of the F-T reactor;
(2)Experimental data on the hydrodynamic and transport parameters at high pressures and temperatures, typical to those of actual F-T synthesis, remain scanty when compared with the plethora of studies conducted using air–water systems in small reactors at ambient conditions;
(3)Several empirical correlations for predicting the hydrodynamic and mass as well heat transfer parameters are available and one should select those which consider the reactor diameter, gas mixtures and the potential foamability of the F-T liquids;
(4)The effect of cooling internals configuration and sparger design on the hydrodynamic and transport parameters, local turbulence, mixing and catalyst attrition are yet to be seriously addressed;
(5)The impact of operating variables on the hydrodynamic and transport parameters as well as the overall performance of the SBCRs should be investigated using actual F-T fluid–solid systems under typical pressures and temperatures using a large-scale reactor (>0.15 m ID) in the presence of gas spargers and cooling internals;
(6)Significant efforts are still required in order to advance CFD modeling of SBCRs, particularly those pertaining to the relevant closure models, such as drag, lift and turbulence. Also, cooling internals configuration and the design as well as orientation of gas spargers should be accounted for in the CFD modeling; and
(7)Proper validations of the CFD formulations using actual systems for F-T SBCR are needed.
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Shakya S, Munshi P. Error analysis of tomographic reconstructions in the absence of projection data. PHILOSOPHICAL TRANSACTIONS. SERIES A, MATHEMATICAL, PHYSICAL, AND ENGINEERING SCIENCES 2015; 373:rsta.2014.0394. [PMID: 25939629 DOI: 10.1098/rsta.2014.0394] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 02/25/2015] [Indexed: 06/04/2023]
Abstract
Error estimates for tomographic reconstructions (using Fourier transform-based algorithm) are available for cases where projection data are available. These data are used for reconstructions with different filter functions and the reliability of these reconstructions can be checked as per guidelines of those error estimates. There are cases where projection data are large (in gigabytes or terabytes) so storage of these data becomes an issue. It leads to storing of only the reconstructed images. Error estimation in such cases is presented here. Second-level projection data are calculated from the given reconstructed images ('first-level' images). These 'second-level' data are now used to generate 'second-level' reconstructed images. Different filter functions are employed to check the fidelity of these 'second-level' images. This inference is extended to first-level images in view of the characteristics of the convolution operator. This approach is validated with experimental data obtained by the X-ray micro-CT scanner installed at IIT Kanpur. Five specimens (of same material) have been scanned. Data are available in this case thus we have performed a comparative error estimate analysis for the 'first-level' reconstructions (data obtained from CT machine) and second-level reconstructions (data generated from first-level reconstructions). We observe that both approaches show similar outcome. It indicates that error estimates can also be applied to images when data are not available.
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Affiliation(s)
- Snehlata Shakya
- Department of Mechanical Engineering, Indian Institute of Technology, Kanpur 208016, India
| | - Prabhat Munshi
- Department of Mechanical Engineering, Indian Institute of Technology, Kanpur 208016, India
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8
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Affiliation(s)
- Tiefeng Wang
- Beijing Key Laboratory of Green Reaction Engineering and Technology, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
| | - Jinfu Wang
- Beijing Key Laboratory of Green Reaction Engineering and Technology, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
| | - Yong Jin
- Beijing Key Laboratory of Green Reaction Engineering and Technology, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
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Cao C, Liu M, Guo Q. Experimental Investigation into the Radial Distribution of Local Phase Holdups in a Gas−Liquid−Solid Fluidized Bed. Ind Eng Chem Res 2007. [DOI: 10.1021/ie060798g] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Changqing Cao
- College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, People's Republic of China, and School of Chemical Engineering & Technology, Tianjin University, Tianjin 300072, People's Republic of China
| | - Mingyan Liu
- College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, People's Republic of China, and School of Chemical Engineering & Technology, Tianjin University, Tianjin 300072, People's Republic of China
| | - Qingjie Guo
- College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, People's Republic of China, and School of Chemical Engineering & Technology, Tianjin University, Tianjin 300072, People's Republic of China
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Akhtar MA, Tadé MO, Pareek VK. Two-Fluid Eulerian Simulation of Bubble Column Reactors with Distributors. JOURNAL OF CHEMICAL ENGINEERING OF JAPAN 2006. [DOI: 10.1252/jcej.39.831] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Muhammad Abid Akhtar
- Process Systems Computational Laboratory, Department of Chemical Engineering, Curtin University of Technology
| | - Moses Oludayo Tadé
- Process Systems Computational Laboratory, Department of Chemical Engineering, Curtin University of Technology
| | - Vishnu Kumar Pareek
- Process Systems Computational Laboratory, Department of Chemical Engineering, Curtin University of Technology
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The important role of local dispersed phase hold-ups for the calculation of three-phase bubble columns. Chem Eng Sci 2005. [DOI: 10.1016/j.ces.2005.02.017] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Seeger A, Kertzscher U, Affeld K, Wellnhofer E. Measurement of the local velocity of the solid phase and the local solid hold-up in a three-phase flow by X-ray based particle tracking velocimetry (XPTV). Chem Eng Sci 2003. [DOI: 10.1016/s0009-2509(03)00010-1] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Enß J, Schallenberg J, Michele V, Hempel D. Messung und Modellierung von Strömungsstrukturen und Phasengehalten bei dreiphasigen Strömungen in Blasensäulenreaktoren. CHEM-ING-TECH 2002. [DOI: 10.1002/1522-2640(20020915)74:9<1326::aid-cite1326>3.0.co;2-u] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Michele V, Hempel DC. Liquid flow and phase holdup—measurement and CFD modeling for two-and three-phase bubble columns. Chem Eng Sci 2002. [DOI: 10.1016/s0009-2509(02)00051-9] [Citation(s) in RCA: 60] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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