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Title	Preliminary Performance Results on Retrofitting Gas Cofiring on a Coal Stoker Boiler
Creator	Keve, Edward; Schindler, Edmund
Publisher	Digitized by J. Willard Marriott Library, University of Utah
Date	1998
Spatial Coverage	presented at Maui, Hawaii
Abstract	The realities of boiler operation at the end of the 20th Century require that the boiler run as clean as possible. No more are we allowed startup opacity spikes, no more soot blowing opacity spikes, NOx and S02 can be sold as commodities on the open market and downwind states require upwind operators to clean up their smog. We all breathe the same air and it seems like there is less and less. Forward looking boiler operators are looking for solutions to these problems at the lowest cost. Up to now, stoker boilers have been grandfathered and have been allowed to operate within certain limits. The application of continuous opacity monitors has sharpened the dialogue with state regulators to look for solutions. One of these solutions is the installation of a small gas burner in the upper furnace. This burner can be used for boiler warmup, cold start up or shut down; but it can also be used to reduce NOx, S02 and particulates. This paper presents actual results from a single burner installed in the upper furnace of a 70,000 LB/hr stoker boiler. The results are a preliminary snapshot without any tuning or optimization of the process.
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
ARK	ark:/87278/s6n87dd5
Setname	uu_afrc
ID	12187
Reference URL	https://collections.lib.utah.edu/ark:/87278/s6n87dd5

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Title	Page 3
Format	application/pdf
OCR Text	Show was handled by the University staff overseeing a local contractor. The system was installed and started up in 1997 for the 97-98 winter. BOILER SPECIFICATION Each boiler, of two, is a Union Iron Works boiler with a Detroit Stoker Spreader. The boilers were installed in 1952 and burn Indiana stoker grade coal. The University is very conscience of the effect of coal sizing on boiler performance and maintains a very tight control over the specification and delivery of the coal. Each boiler is rated at 70,000 lb/hr steam flow and the superheater outlet temperature is rated at 720° F. The superheater has no temperature control system other than excess 02. The boiler is a two-drum unit with an economizer installed after the boiling section. The furnace depth is 13'4" the width is 12' and the furnace height is 26'4" to the center of the ceiling. A single natural gas fired burner, TODD's Variflame burner, is installed six feet above the bed in the sidewall. The burner was installed above the overfire air system to complement the overfire air system. The burner heat input is 48 MMBTU/hr. The combustion air temperature is 80°F. The boiler air system is a balanced draft system with an additional fan supplied for the Variflame burner and a small blower for the O F A system. A boiler side view is shown in Figure 1. A multiclone is used for ash collection. BURNER DESCRIPTION The cofiring burner is a T O DD Combustion Variflame burner. This is TODD's standard low N O x industrial burner normally used in a variety of IWK AJFRC SYMPOSIM MAI q
Setname	uu_afrc
ID	12180
Reference URL	https://collections.lib.utah.edu/ark:/87278/s6n87dd5/12180