Experimental validation of multiphase particle-in-cell simulations of fluidization in a bubbling fluidized bed combustor

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F22%3A00377764" target="_blank" >RIV/68407700:21340/22:00377764 - isvavai.cz</a>

Result on the web

<a href="https://sites.google.com/view/comfos22/conference-details" target="_blank" >https://sites.google.com/view/comfos22/conference-details</a>

DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Experimental validation of multiphase particle-in-cell simulations of fluidization in a bubbling fluidized bed combustor

Original language description

As part of our long-term aim at developing a complex CFD simulation tool for bubbling fluidized bed boilers operating in oxyfuel regime, we have performed several fluidization experiments to validate our numerical algorithm for multiphase flow simulation. The algorithm combines and extends the function of several components of OpenFOAM, using the Multiphase Particle In Cell method within a custom solver derived from coalChemistryFoam. In this contribution, we summarize the features of the numerical solver. Afterward, we focus on the design of the experiment, the methodology of data processing, and the obtained results. The experimental device used is a model of the combustion chamber, the distributor, and the windbox. Its transparent walls are made of polymethyl methacrylate. In the experiments, three different materials (sand and two types of LECA suitable for use in fluidized bed combustion) were subjected to fluidization at different flow rates, using air at room temperature as the fluidization medium. The flow rates and the pressure drop at the fluidized bed were measured. Video recordings were taken and image postprocessing allowed to identify the level of the fluidized bed, its height and its shape as viewed from the front. Based on the sieve analysis, accurate particle size distributions were calculated and implemented in the model. Afterward, simulations were performed and model parameters (especially those of the particle stress model and the gas-solid drag model) were adjusted to obtain satisfactory agreement with the experiments in terms of the time-averaged pressure drop, bed height, and qualitative behavior. In addition, bubble size statistics were obtained from sand simulations by taking advantage of the solids volume fraction field of the MP-PIC algorithm. The results were compared with data from literature and a surprisingly high degree of agreement has been found. In summary, we present a unique combination of mathematical modeling, numerical simulation and experimental work aimed at creating a reliable computational model of a fluidized bed boiler.

Czech name

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Czech description

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Type

O - Miscellaneous

CEP classification

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OECD FORD branch

10305 - Fluids and plasma physics (including surface physics)

Project

<a href="/en/project/EF16_019%2F0000753" target="_blank" >EF16_019/0000753: Research centre for low-carbon energy technologies</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2022

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů