Abstract
A method for simultaneously visualizing the two-dimensional distributions of temperature and soot volume fraction in an ethylene flame was presented. A single-color charge-coupled device (CCD) camera was used to capture the flame image in the visible spectrum considering the broad-response spectrum of the R and G bands of the camera. The directional emissive power of the R and G bands were calibrated and used for measurement. Slightly increased temperatures and reduced soot concentration were predicted in the central flame without self-absorption effects considered, an iterative algorithm was used for eliminating the effect of self-absorption. Nine different cases were presented in the experiment to demonstrate the effects of fuel mass flow rate and oxygen concentration on temperature and soot concentration in three different atmospheres. For ethylene combustion in pure-air atmosphere, as the fuel mass flow rate increased, the maximum temperature slightly decreased, and the maximum soot volume fraction slightly increased. For oxygen fractions of 30%, 40%, and 50% combustion in O2/N2 oxygen-enhanced atmospheres, the maximum flame temperatures were 2276, 2451, and 2678 K, whereas combustion in O2/CO2 atmospheres were 1916, 2322, and 2535 K. The maximum soot volume fractions were 4.5, 7.0, and 9.5 ppm in oxygen-enriched O2/N2 atmosphere and 13.6, 15.3, and 14.8 ppm in oxygen-enriched O2/CO2 atmosphere. Compared with the O2/CO2 atmosphere, combustion in the oxygen-enriched O2/N2 atmosphere produced higher flame temperature and larger soot volume fraction. Preliminary results indicated that this technique is reliable and can be used for combustion diagnosis.
Highlights
Numerous thermal power plants in China use coal as fuel
O2 /CO2 combustion is a process of burning coal in a mixture of oxygen and recycled flue gas, generating a CO2 -concentrated sequestration-ready flue gas [1,2]
The flame flameimages images ethylene combustion in nine different cases are in shown these images represent the unsaturated flame images, which were used for reconstructing the flame. These images represent the unsaturated flame images, which were used for reconstructing temperature and soot volume fraction
Summary
Numerous thermal power plants in China use coal as fuel. When dealing with technologies related to coal combustion, particulate removal and CO2 reduction have to be considered. A potential technique for CO2 capture is oxy-combustion of coal. O2 /CO2 combustion is a process of burning coal in a mixture of oxygen and recycled flue gas, generating a CO2 -concentrated sequestration-ready flue gas [1,2]. Success in the implementation of O2 /CO2 combustion in coal-fired boilers depends on understanding the differences after the replacement of N2 with CO2. The difference in the thermal properties of N2 and CO2 renders O2 /CO2 combustion significantly different from air combustion
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