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Combustion experiments of fuel gases in atmospheric fluidized bed combustor test rig

Technical Report:

Abstract

This paper describes the combustion measurements done in a bubbling fluidized bed combustor at Tampere University of Technology. This study forms a part of a larger project, the object of which is to develop a total model for ignition and combustion of the volatile matter released from solid high-volatile fuel in a bubbling fluidized bed. In modelling of fluidized bed combustor it is important to describe correctly the combustion reactions and the phases in which they occur. In peat combustion, although a large percentage of the heat content can be contained within the volatiles, the mechanism of volatile combustion has not been determined so far. In a fluidized bed every sand particle acts like a wall and the so-called `wall effects` have a strong influence on the combustion mechanism. Therefore combustion models in which the wall reactions are not included cannot be used in the particulate or in the bubble phase of a fluidized bed. The moisture present in bed was found to be of great importance especially when carbon monoxide was used as fuel gas. The effect of moisture to the reaction rate of carbon monoxide-air mixture was found to be opposite to that measured in air. This means,  More>>
Authors:
Publication Date:
Dec 31, 1993
Product Type:
Technical Report
Report Number:
TTKK-LT-90
Reference Number:
SCA: 014000; PA: FI-95:003084; EDB-95:027069; SN: 95001320436
Resource Relation:
Other Information: PBD: 1993
Subject:
01 COAL, LIGNITE, AND PEAT; FLUIDIZED-BED COMBUSTORS; MEASURING METHODS; FUEL GAS; FLUIDIZED-BED COMBUSTION; VOLATILE MATTER; BUBBLES; SOLID FUELS; CARBON MONOXIDE; METHANE; PROPANE; TEMPERATURE RANGE 1000-4000 K; PEAT; COAL; SAND; 014000; COMBUSTION
OSTI ID:
10115083
Research Organizations:
Tampere Univ. of Technology (Finland). Thermal Engineering
Country of Origin:
Finland
Language:
English
Other Identifying Numbers:
Other: ON: DE95737622; ISBN 951-722-048-0; TRN: FI9503084
Availability:
OSTI; NTIS
Submitting Site:
FI
Size:
22 p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Wallen, V. Combustion experiments of fuel gases in atmospheric fluidized bed combustor test rig. Finland: N. p., 1993. Web.
Wallen, V. Combustion experiments of fuel gases in atmospheric fluidized bed combustor test rig. Finland.
Wallen, V. 1993. "Combustion experiments of fuel gases in atmospheric fluidized bed combustor test rig." Finland.
@misc{etde_10115083,
title = {Combustion experiments of fuel gases in atmospheric fluidized bed combustor test rig}
author = {Wallen, V}
abstractNote = {This paper describes the combustion measurements done in a bubbling fluidized bed combustor at Tampere University of Technology. This study forms a part of a larger project, the object of which is to develop a total model for ignition and combustion of the volatile matter released from solid high-volatile fuel in a bubbling fluidized bed. In modelling of fluidized bed combustor it is important to describe correctly the combustion reactions and the phases in which they occur. In peat combustion, although a large percentage of the heat content can be contained within the volatiles, the mechanism of volatile combustion has not been determined so far. In a fluidized bed every sand particle acts like a wall and the so-called `wall effects` have a strong influence on the combustion mechanism. Therefore combustion models in which the wall reactions are not included cannot be used in the particulate or in the bubble phase of a fluidized bed. The moisture present in bed was found to be of great importance especially when carbon monoxide was used as fuel gas. The effect of moisture to the reaction rate of carbon monoxide-air mixture was found to be opposite to that measured in air. This means, that correlations for carbon monoxide oxidation found in the literature cannot be used when modelling combustion inside a fluidized bed. The results presented in this paper are some of those I got from nearly 300 test runs. A lot more experiments have to be made with different fuel gases before we can better understand the nature of volatile combustion in fluidized bed}
place = {Finland}
year = {1993}
month = {Dec}
}