Abstract:Lean premixed combustion
is one of the most effective methods to
constrain pollutant emissions for modern industrial gas turbines.
An experimental study was performed on its propagation speed and internal
structure at engine-relevant temperatures. A Bunsen burner was employed
for the measurement with an optical schlieren system. The results
show that the increase of preheating temperature dramatically accelerates
the propagation of methane flames. The numerical results predicted
by
GRI-Mech 3.0, FFCM-1, and US… Show more
“…Most studies use statistical characteristics of the image pixel values, − ,− which are related to the intensity of light emissions. Additionally, other methods can also compute texture , and geometrical characteristics ,,− and flame speeds. , Before the characteristics are extracted from the image, several preprocessing techniques are used. These preprocessing techniques include the averaging of image sequences, ,, flame segmentation with thresholding, ,, noise filters, color space conversions to grayscale, and finally hue, saturation, and intensity (HSI). , …”
The use of blast
furnace gas (BFG) as a fuel provides an alternative
for waste stream valorization in the steel industry, enhancing the
sustainability and decarbonization of its processes. Nevertheless,
the implementation of this solution on an industrial scale requires
a continuous control of the combustion due to the low calorific value
of BFG. This work analyzes the combustion behavior and monitoring
of BFG/CH
4
blends in a laboratory premixed fuel burner.
We evaluate several stable combustion conditions by burning different
BFG/CH
4
mixtures at a constant power rate over a wide range
of air/fuel equivalence ratios. In addition, relevant image features
and chemiluminescence emission spectra have been extracted from flames,
using advanced optical devices. BFG combustion causes an increase
in CO
2
and CO emissions, since those fuels are the main
fuel components of the mixture. On the other hand, NO
x
emissions decreased because of the low temperature
of combustion of the BFG and its mixtures. Chemiluminescence shows
that, in the case of CH
4
combustion, peaks associated with
hydrocarbons are present, while during the substitution of CH
4
by BFG those peaks are attenuated. Image flame features extracted
from both ultraviolet and visible bandwidths show a correlation with
the fuel blend and air/fuel equivalence ratio. In the end, methodologies
developed in this work have been proven to be valuable alternatives
with a high potential for the monitoring and control of BFG cofiring
for the steel industry.
“…Most studies use statistical characteristics of the image pixel values, − ,− which are related to the intensity of light emissions. Additionally, other methods can also compute texture , and geometrical characteristics ,,− and flame speeds. , Before the characteristics are extracted from the image, several preprocessing techniques are used. These preprocessing techniques include the averaging of image sequences, ,, flame segmentation with thresholding, ,, noise filters, color space conversions to grayscale, and finally hue, saturation, and intensity (HSI). , …”
The use of blast
furnace gas (BFG) as a fuel provides an alternative
for waste stream valorization in the steel industry, enhancing the
sustainability and decarbonization of its processes. Nevertheless,
the implementation of this solution on an industrial scale requires
a continuous control of the combustion due to the low calorific value
of BFG. This work analyzes the combustion behavior and monitoring
of BFG/CH
4
blends in a laboratory premixed fuel burner.
We evaluate several stable combustion conditions by burning different
BFG/CH
4
mixtures at a constant power rate over a wide range
of air/fuel equivalence ratios. In addition, relevant image features
and chemiluminescence emission spectra have been extracted from flames,
using advanced optical devices. BFG combustion causes an increase
in CO
2
and CO emissions, since those fuels are the main
fuel components of the mixture. On the other hand, NO
x
emissions decreased because of the low temperature
of combustion of the BFG and its mixtures. Chemiluminescence shows
that, in the case of CH
4
combustion, peaks associated with
hydrocarbons are present, while during the substitution of CH
4
by BFG those peaks are attenuated. Image flame features extracted
from both ultraviolet and visible bandwidths show a correlation with
the fuel blend and air/fuel equivalence ratio. In the end, methodologies
developed in this work have been proven to be valuable alternatives
with a high potential for the monitoring and control of BFG cofiring
for the steel industry.
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