Experimental and numerical investigation of air flow through the distributor plate in a laboratory-scale model of a bubbling fluidized bed boiler

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21220%2F22%3A00363156" target="_blank" >RIV/68407700:21220/22:00363156 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68407700:21340/22:00363156

Výsledek na webu

<a href="https://doi.org/10.1007/s13160-022-00518-x" target="_blank" >https://doi.org/10.1007/s13160-022-00518-x</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s13160-022-00518-x" target="_blank" >10.1007/s13160-022-00518-x</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Experimental and numerical investigation of air flow through the distributor plate in a laboratory-scale model of a bubbling fluidized bed boiler

Popis výsledku v původním jazyce

In fluidized bed boilers, the distributor plate is a perforated metal plate which forms the bottom of the combustion chamber and separates it from the windbox. It prevents the fluidized granular material from falling through. At the same time, it allows an even distribution of the fluidization air which flows through the small holes. In this contribution, we consider an experimental model of the fluidized bed boiler and study the dependence of pressure drop at the distributor plate on the air flow rate. Numerical simulations of turbulent flow through the detailed three-dimensional geometry of the device are compared to experimental measurements. Two different simulation tools are used: our in-house high performance GPU solver based on the lattice Boltzmann method (LBM) and the ANSYS Fluent CFD software based on the finite volume method (FVM). The accuracy of both methods is strongly dependent on the mesh/lattice resolution inside (and in the vicinity of) the small holes of the distributor plate. When similar resolutions are used, FVM provides more accurate results than the original LBM scheme. However, the accuracy of LBM can be significantly improved by changing the parameters of the collision model so that it outperforms FVM. A simple convergence study of all involved numerical methods indicates improvement of the results with mesh/lattice refinement. In addition, LBM uses a structured lattice with the same resolution in the whole domain, which allows it to provide a detailed information on the non-uniformity of the velocity field above the distributor plate. The obtained results can be utilized to design a simplified model of the distributor plate for the purpose of complex CFD simulations of multiphase flow and combustion in fluidized bed boilers.

Název v anglickém jazyce

Experimental and numerical investigation of air flow through the distributor plate in a laboratory-scale model of a bubbling fluidized bed boiler

Popis výsledku anglicky

In fluidized bed boilers, the distributor plate is a perforated metal plate which forms the bottom of the combustion chamber and separates it from the windbox. It prevents the fluidized granular material from falling through. At the same time, it allows an even distribution of the fluidization air which flows through the small holes. In this contribution, we consider an experimental model of the fluidized bed boiler and study the dependence of pressure drop at the distributor plate on the air flow rate. Numerical simulations of turbulent flow through the detailed three-dimensional geometry of the device are compared to experimental measurements. Two different simulation tools are used: our in-house high performance GPU solver based on the lattice Boltzmann method (LBM) and the ANSYS Fluent CFD software based on the finite volume method (FVM). The accuracy of both methods is strongly dependent on the mesh/lattice resolution inside (and in the vicinity of) the small holes of the distributor plate. When similar resolutions are used, FVM provides more accurate results than the original LBM scheme. However, the accuracy of LBM can be significantly improved by changing the parameters of the collision model so that it outperforms FVM. A simple convergence study of all involved numerical methods indicates improvement of the results with mesh/lattice refinement. In addition, LBM uses a structured lattice with the same resolution in the whole domain, which allows it to provide a detailed information on the non-uniformity of the velocity field above the distributor plate. The obtained results can be utilized to design a simplified model of the distributor plate for the purpose of complex CFD simulations of multiphase flow and combustion in fluidized bed boilers.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10305 - Fluids and plasma physics (including surface physics)

Projekt

<a href="/cs/project/EF16_019%2F0000753" target="_blank" >EF16_019/0000753: Centrum výzkumu nízkouhlíkových energetických technologií</a><br>

Návaznosti

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

Rok uplatnění

2022

Kód důvěrnosti údajů

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

Název periodika

Japan Journal of Industrial and Applied Mathematics

ISSN

0916-7005

e-ISSN

1868-937X

Svazek periodika

39

Číslo periodika v rámci svazku

12

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

16

Strana od-do

943-958

Kód UT WoS článku

000825216900001

EID výsledku v databázi Scopus

2-s2.0-85133604916