Environmental Engineering Reference
In-Depth Information
Lean Blowout Detection Techniques
for Partially Premixed Flames in a Dump
Combustor
Swarnendu Sen, Rajendra R. Chaudhari
and Achintya Mukhopadhyay
Abstract Lean premixed or partially premixed combustion in gas turbine com-
bustors is one of the popular strategies for achieving very low NO
x
levels. However,
lean combustion is extremely susceptible to lean blowout (LBO). LBO is a sig-
ni
cant safety hazard for aeroengines and necessitates an expensive and time-
consuming shutdown and restarting procedure for stationary engines. To avoid
blowout, usually current combustors are therefore typically operated with a fuel
air
-
mixture that is signi
Φ
LBO
). These techniques
found to be good in terms of safety margin but produces higher NO
x
due to high
temperature of
cantly richer than the LBO limit (
flame. Online LBO prediction techniques are required for real-time
control of combustors to maintain a continuous
fl
flame with smaller margins from the
LBO limit. Experiments carried out on a gas-fueled swirl-stabilized dump com-
bustor at different degrees of premixing and
fl
ow rates. LPG and methane are used
as fuel for the combustor. Combustion behavior at different degrees of premixing
has been studied. Existing LBO detection techniques are evaluated, which neces-
sitates the development of new LBO techniques. Two optical signal-based detection
techniques have been discussed here
fl
ame color-based technique and symbolic
time series analysis (STSA)-based technique. Both the methods performed well for
a wide range of parametric variation.
—
fl
Keywords Environmental degradation
Lean blowout detection
Liquid
petroleum gas
Stoichiometric combustion
Anomaly measure
The monograph is based on a part of the doctoral work of R. R. Chaudhari and published papers
by the authors in International Journal of Spray and Combustion Dynamics,5,49
-
66, 2013 and
Journal of propulsion and Power, 29, 950
-
960, 2013.
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