Combustion in large boilers: Design and operating effects on efficiency and emissions

Breen, B. P.

doi:10.1016/s0082-0784(77)80311-1

Cited by 3 publications

(2 citation statements)

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“…Plenty of studies investigated water or steam injection techniques [4,[8][9][10][11][12], but this method is uncommon in the state-of-the-art combustion systems. Typically, water-fuel --------------emulsion improves the atomization characteristics since the lower boiling point of the water leads to micro-explosions and results in a finer fuel spray [8,13].…”

Section: Introductionmentioning

confidence: 99%

“…This method is utilized in several land-based power generating gas turbines in order to keep the emission of NO x below the threshold. In industrial boilers where the steam generator is already present, steam injection to the combustion zone is more prevalent [10,11]. Furuhata et al [4] concluded that the most efficient burner configuration for steam addition from the NO x emission point of view is neighborhood of the atomizer.…”

Section: Introductionmentioning

confidence: 99%

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Flame emission spectroscopy measurement of a steam blast and air blast burner

Józsa

Sztankó

2017

THERM SCI

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Control and online monitoring of combustion have become critical to meet the increasingly strict pollutant emission standards. For such a purpose, optical sensing methods, like flame emission spectrometry, seem to be the most feasible technique. Spectrometry is capable to provide information about the local equivalence ratio inside the flame through the chemiluminescence intensity ratio measurement of various radicals. In the present study, a 15 kW atmospheric burner was analyzed utilizing standard diesel fuel. Its plain jet type atomizer was operated with both air and steam atomizing mediums. Up to now, injection of steam into the reaction zone has attracted less scientific attention contrary to its practical importance. Spatial plots of OH*, CH*, and C 2 * excited radicals were analyzed at 0.35, 0.7, and 1 bar atomization gauge pressures, utilizing both atomizing mediums. The C 2 * was found to decrease strongly with increasing steam addition. The OH*/CH* and OH*/C 2 * chemiluminescence intensity ratios along the axis showed a divergent behavior in all the analyzed cases. Nevertheless, CH*/C 2 * chemiluminescence intensity ratio decreased only slightly, showing low sensitivity to the position of the spectrometer. The findings may be directly applied in steady operating combustion systems, i. e., gas turbines, boilers, and furnaces.

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