Experimental and simulation study of heat transfer in fluidized beds with heat production
Autor: | M. van Sint Annaland, Kay A. Buist, Zizi Li, NG Niels Deen, J.A.M. Kuipers, T.C.E. Janssen |
---|---|
Přispěvatelé: | Multi-scale Modelling of Multi-phase Flows, Power & Flow, Chemical Process Intensification, Group Deen |
Jazyk: | angličtina |
Rok vydání: | 2017 |
Předmět: |
Exothermic reaction
Thermogravimetric analysis Materials science General Chemical Engineering Thermodynamics 02 engineering and technology Computational fluid dynamics Industrial and Manufacturing Engineering Adsorption 020401 chemical engineering Discrete element model Thermal Environmental Chemistry 0204 chemical engineering Thermal analysis Infrared technique business.industry General Chemistry 021001 nanoscience & nanotechnology Fluidized bed Heat transfer 0210 nano-technology business Gas solid fluidized beds Heat production Particle temperature distribution |
Zdroj: | Chemical Engineering Journal, 317, 242-257. Elsevier |
ISSN: | 1385-8947 |
Popis: | As a result of highly exothermic reactions during gas-phase olefin polymerization in fluidized bed reactors, difficulties with respect to the heat management play an important role in the optimization of these reactors. To obtain a better understanding of the particle temperature distribution in fluidized beds, a high speed infrared (IR) camera and a visual camera have been coupled to capture the hydrodynamic and thermal behavior of a pseudo-2D fluidized bed. The experimental data were subsequently used to validate an in-house developed computational fluid dynamics and discrete element model (CFD-DEM). In order to mimic the heat effect due to the exothermic polymerization reaction, a model system was used. In this model system, heat is released in zeolite 13X particles (1.8–2.0 mm, Geldart D type) due to the adsorption of CO2. All key aspects of the adsorption process (kinetics, equilibrium and heat effect) were studied separately using Thermogravimetric Analysis (TGA) and Simultaneous Thermal Analysis (STA), and subsequently fluidized bed experiments were conducted, by feeding gas mixtures of CO2 and N2 with different CO2 concentrations to the bed, where the total heat of liberation could be controlled. The combined infrared/visual camera technique generated detailed information on the thermal behavior of the bed. Furthermore, the comparison of the spatial and temporal distributions of the particle temperature measured in the fluidized bed with the simulation results of CFD-DEM provides qualitative and quantitative validation of the CFD-DEM, in particular concerning the thermal aspects. |
Databáze: | OpenAIRE |
Externí odkaz: |
Pro tento záznam nejsou dostupné žádné jednotky.