Bed-to-surface heat transfer in a BFB oxy-fuel combustor

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21220%2F24%3A00377808" target="_blank" >RIV/68407700:21220/24:00377808 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1016/j.fuel.2024.131093" target="_blank" >https://doi.org/10.1016/j.fuel.2024.131093</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.fuel.2024.131093" target="_blank" >10.1016/j.fuel.2024.131093</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Bed-to-surface heat transfer in a BFB oxy-fuel combustor

Popis výsledku v původním jazyce

This work presents an experimental determination of heat transfer coefficient between the dense zone of a bubbling fluidized bed combustor and an immersed heat exchanging surface in oxy-fuel combustion mode, air mode being used for a comparison. The experimental work was carried out using a 30 kW scale autothermal bubbling fluidized bed combustor with real wet flue gas recirculation. A lightweight ceramic aggregate was used as the bed material and wood pellet as the fuel, the testing range of the bed temperature and fluidization velocity was within a typical range of fluidized bed combustors. For heat transfer measurement purposes, a single -loop water-cooled heat exchanger was developed. Convection and radiation were evaluated for both combustion modes. The convection in air mode reaches about 120 to 180 W/m2/K, while in the oxy-fuel mode it reaches about 180 to 230 W/m2/K. Radiation is not particularly affected by the combustion mode, reaching 80 to 120 W/ m2/K for both modes. The correlation equations to determine convection were examined and compared with the experimental data. The general shortcoming of most of the available equations is a disagreement in trend between the predicted and experimentally measured convection correlated with the fluidization velocity. The Packet model, which was identified to predict this trend correctly, was fitted with the experimental data to determine new constants. The modified model is capable of predicting convection with a 2 and a 9 % deviation for air and oxyfuel combustion modes, respectively.

Název v anglickém jazyce

Bed-to-surface heat transfer in a BFB oxy-fuel combustor

Popis výsledku anglicky

This work presents an experimental determination of heat transfer coefficient between the dense zone of a bubbling fluidized bed combustor and an immersed heat exchanging surface in oxy-fuel combustion mode, air mode being used for a comparison. The experimental work was carried out using a 30 kW scale autothermal bubbling fluidized bed combustor with real wet flue gas recirculation. A lightweight ceramic aggregate was used as the bed material and wood pellet as the fuel, the testing range of the bed temperature and fluidization velocity was within a typical range of fluidized bed combustors. For heat transfer measurement purposes, a single -loop water-cooled heat exchanger was developed. Convection and radiation were evaluated for both combustion modes. The convection in air mode reaches about 120 to 180 W/m2/K, while in the oxy-fuel mode it reaches about 180 to 230 W/m2/K. Radiation is not particularly affected by the combustion mode, reaching 80 to 120 W/ m2/K for both modes. The correlation equations to determine convection were examined and compared with the experimental data. The general shortcoming of most of the available equations is a disagreement in trend between the predicted and experimentally measured convection correlated with the fluidization velocity. The Packet model, which was identified to predict this trend correctly, was fitted with the experimental data to determine new constants. The modified model is capable of predicting convection with a 2 and a 9 % deviation for air and oxyfuel combustion modes, respectively.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20704 - Energy and fuels

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

2024

Kód důvěrnosti údajů

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

Název periodika

Fuel

ISSN

0016-2361

e-ISSN

1873-7153

Svazek periodika

364

Číslo periodika v rámci svazku

131093

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

12

Strana od-do

1-12

Kód UT WoS článku

001177513800001

EID výsledku v databázi Scopus

2-s2.0-85184059904