Abstract
At Foster Wheeler, a three-dimensional CFB furnace model
is essential part of knowledge development of CFB furnace
process regarding solid mixing, combustion, emission
formation and heat transfer. Results of laboratory and
pilot scale phenomenon research are utilized in
development of sub-models. Analyses of field-test results
in industrial-scale CFB boilers including furnace profile
measurements are simultaneously carried out with
development of 3-dimensional process modeling, which
provides a chain of knowledge that is utilized as
feedback for phenomenon research. Knowledge gathered by
model validation studies and up-to-date parameter
databases are utilized in performance prediction and
design development of CFB boiler furnaces. This paper
reports recent development steps related to modeling of
combustion and formation of char and volatiles of various
fuel types in CFB conditions. Also a new model for
predicting the formation of nitrogen oxides is presented.
Validation of mixing and combustion parameters for solids
and gases are based on test balances at several
large-scale CFB boilers combusting coal, peat and
bio-fuels. Field-tests including lateral and vertical
furnace profile measurements and characterization of
solid materials provides a window for characterization of
fuel specific mixing and combustion behavior in CFB
furnace at different loads and operation conditions.
Measured horizontal gas profiles are projection of
balance between fuel mixing and reactions at lower part
of furnace and are used together with both lateral
temperature profiles at bed and upper parts of furnace
for determination of solid mixing and combustion model
parameters. Modeling of char and volatile based formation
of NO profiles is followed by analysis of oxidizing and
reducing regions formed due lower furnace design and
mixing characteristics of fuel and combustion airs
effecting to formation of NO furnace profile by reduction
and volatile-nitrogen reactions. This paper presents CFB
process analysis focused on combustion and NO profiles in
pilot and industrial scale bituminous coal combustion.
| Original language | English |
|---|---|
| Title of host publication | Proceedings of the 20th International Conference on Fluidized Bed Combustion |
| Place of Publication | Beijing |
| Publisher | Springer |
| Pages | 757-763 |
| ISBN (Electronic) | 978-3-642-02682-9 |
| ISBN (Print) | 978-3-642-02681-2 |
| DOIs | |
| Publication status | Published - 2009 |
| MoE publication type | A4 Article in a conference publication |
| Event | 20th International Conference on Fluidized Bed Combustion - Xi'an, China Duration: 18 May 2009 → 21 May 2009 |
Conference
| Conference | 20th International Conference on Fluidized Bed Combustion |
|---|---|
| Country/Territory | China |
| City | Xi'an |
| Period | 18/05/09 → 21/05/09 |
Keywords
- 3-dimensional CFB model
- Combustion
- Furnace profiles
- Nox model
