Coal Combustion Technology in Wide Load Range Burners

Update item information
Title Coal Combustion Technology in Wide Load Range Burners
Creator Baba, Akira; Nomura, Shin-ichiro; Okiura, Kunio; Akiyama, Iwao; Morita, Shigeki; Azuhata, Shigeru
Publisher Digitized by J. Willard Marriott Library, University of Utah
Date 1991
Spatial Coverage presented at Honolulu, Hawaii
Abstract To develop and design new burners used in wide load range coal firing boilers, the following two fundamental studies were carried out. (1) Theoretical studies on ignition of coal particles and the flame propagation velocity in relation to solid concentration. The theory revealed that the thermal diffusion in a turbulent flow affected greatly to enlarge the flame propagation velocity and that a suitable primary air velocity to sustain the stable ignition of coal existed in terms of the coal concentration. (2) Cold model tests on condensation of coal-airstream near the burner outlet. Coal and air mixture was divided into two flows with dense and lean concentrations of coal by a condensation module mounted inside the burner. Through the cold flow test, we found that the two separated flows met immediately at the burner outlet and were mixed causing the unstable ignition of coal particles. This mixing was enhanced by a large velocity gap between the two flows. Therefore the position of the condensation module inside the burner were examined to minimize the mixing at the burner outlet. Based upon the results of these studies, we devised the burner configuration and arrangement in which the flow and the coal concentration near the burner outlet were optimum for the stable ignition. Two new designed burners (coal:50 kg/h, 3600 kg/h) were succeeded in a range of practical operations without backup fuel.
Type Text
Format application/pdf
Language eng
Rights This material may be protected by copyright. Permission required for use in any form. For further information please contact the American Flame Research Committee.
Conversion Specifications Original scanned with Canon EOS-1Ds Mark II, 16.7 megapixel digital camera and saved as 400 ppi uncompressed TIFF, 16 bit depth.
Scanning Technician Cliodhna Davis
Metadata Cataloger Kendra Yates
ARK ark:/87278/s6028v4c
Setname uu_afrc
Date Created 2012-04-20
Date Modified 2012-09-05
ID 7242
Reference URL
Back to Search Results