Discussions on Particle Flux Measurement in Gas-Solids Risers
-
Yongmin Zhang
Abstract
In gas-solids risers of fast fluidization regime, the gross particle flux determined by integrating the product of the measured average particle concentration and velocity is always found several times or even larger than that measured by direct experimental methods. Based on analysis of the measurement mechanisms and a simple model for two-phase flow structure in gas-solids risers, this big unidirectional deviation is first explained in depth in this study. It is concluded that the unique two-phase flow structure (i.e. the low-velocity dense phase and high-velocity dilute phase in a gas-solids riser) and the bad coupling quality of the measured transient particle concentration and velocity during data processing lead to this big unidirectional deviation. Finally, this explanation is extended to wider multiphase flow systems and advices are proposed in measuring phase fluxes.
Funding statement: Funding: The authors acknowledge the financial supports by the National Natural Science Foundation of China (21276273), the Ministry of Science and Technology of China (2012CB215004), the Science Foundation of China University of Petroleum, Beijing (2462015YQ0312).
Acknowledgements
The authors are also indebted to Dr. Yiping Fan in China University of Petroleum, Beijing, China, for the precious discussions with him on this topic. Finally, the precious advices and revisions in writing this paper by Profs. John R. Grace and Xiaotao Bi in the University of British Columbia, Canada are also acknowledged here.
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©2016 by De Gruyter
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- Research Articles
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- Oxidative Degradation of Methylene Blue in Aqueous Medium Catalyzed by Lab Prepared Nickel Hydroxide
- CFD Modelling of a Hollow Fibre Membrane for CO2 Removal by Aqueous Amine Solutions of MEA, DEA and MDEA
- Performance Study of a Thermally Double Coupled Multi-Tubular Reactor by Considering the Effect of Flow Type Patterns
- Radiative Three-Dimensional Flow with Chemical Reaction
- Three-Phase Model of a Fluidized-Bed Catalytic Reactor for Polyethylene Synthesis
- Study on the Effect of Nickel Doping on Mo-Bi Based Catalyst for Selective Oxidation of Isobutene to Methacrolein
- DM Water Plant Sedimentation as a Cheap and Waste Source of Catalyst for Biodiesel Production
- Recovery of Biogas from Meat Industry Wastewater Using Continuously Stirred Tank Reactor (CSTR): Modeling and Optimization
- Comparison of CFD Simulation and Simplified Modeling of a Fluidized Bed CO2 Capture Reactor
- Kinetic Study for Platinum Extraction from Spent Catalyst in Cyanide Solution at High Temperatures
- Hydroisomerization of Biomass Derived n-Hexadecane Towards Diesel Pool: Effect of Selective Removal External Surface Sites from Pt/ZSM-22
- Heat Flux and Variable Thermal Conductivity Effects on Casson Flow and Heat Transfer due to an Exponentially Stretching Sheet with Viscous Dissipation and Heat Generation
- Optimization of Nickel Chemical Extraction from Hazardous Residue
- Green Approach for Biodiesel Production from Jojoba Oil Supported by Process Modeling and Simulation
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