Research and development of the low NOx radially stratified flame core (RSFC) burner is followed from its fundamental concept through prototype burner design, pilot scale experiments at M.I.T. and scale-up and commercial design by ABB-CE (now ALSTOM Power) to applications in industrial and utility plant boilers. The principle that turbulence can be significantly damped in a rotating flow field with a strong positive radial density gradient was used to increase the fuel rich zone residence time in internally staged low NOx burners. The continuous interaction of ideas from laboratory experimental and computational studies with those from the commercial design and industrial scale tests played a pivotal role in the development of the final product, the commercial RSFC burner. Examples of application in gas, oil, and coal fired industrial and utility boilers are discussed.
This paper presents a novel approach toward a fundamental understanding of ash deposit phenomena and describes a laboratory bench-scale technique for assessing the slagging and fouling potential of mineral matter in coal in a boiler firing pulverized fuel. Coal ash deposits collected from boiler tube surfaces have been found to differ from the composition of the coal ash as fired; i.e., selective deposition has occurred. Data are presented to show that analysis of the distribution of mineral matter in the coal matrix can account for this difference. The technique that has been developed consists of a gravity fractionation of pulverized coal so that the ash can be analyzed in groups of particles that are capable of unique behavior in the boiler. The collective behavior of individual ash particles during combustion is not necessarily equivalent to the behavior of a mixture of all ash particles as would be determined by conventional ASTM tests.
w m rnAW is UW'GiSfrn Portions of this document m y be illegible in electronic image products. Images are produced from the best available original dOCUmeIIt0 DISCLAIMER This report was prepared as an account of work sponsored by a n agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, make any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not neceSSacily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof.
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