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Title	Riley-Takuma Technology for Refuse Combustion Plants
Creator	Itse, Daniel C.; Penterson, Craig A.; Wakamura, Yasujiro
Publisher	Digitized by J. Willard Marriott Library, University of Utah
Date	1987
Spatial Coverage	presented at Palm Springs, California
Abstract	This paper describes the design and operation of the Riley-Takuma combustion system for Muncipal Solid Wastes (MSW). Fuels such as MSW have widely variable heating values, moisture contents, and size distributions. Refuse firing systems, therefore, require flexible combustion control systems to insure complete combustion and to minimize the formation of pollutants such as CO, NOx and organic emissions. The Riley-Takuma system includes three grates, with individual undergrate air controls, designed to promote fuel drying, combustion, and burnout. Multiple levels of OFA jets in the furnace are used to control mixing and temperature above the grate. An automatic combustion air control system provides the flexibility to burn a variety of MSW fuels regardless of source, season, or geographic origin. In MSW systems, the primary purpose of overfire air is to promote turbulent combustion above the grate, to enhance burnout and to destroy trace organic species. However, these conditions have been found to enhance the formation of NOx. Data are presented and discussed on methods of NOx control which have been tested in Japan. Results of recent field tests on a commercial MSW combustor are presented and the effects of overfire air are discussed. Current research efforts on applying natural gas co-firing technology to the Riley-Takuma combustion systems are also described.
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/s63j3ghm
Setname	uu_afrc
ID	4398
Reference URL	https://collections.lib.utah.edu/ark:/87278/s63j3ghm

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Title	Page 3
Format	application/pdf
OCR Text	Show INTRODUCTION Mass Burning comprises 68 percent of the refuse combustion systems in the United States. This trend is expected to continue through the next decade. Mass burning totals 59 percent of the installations currently planned or under construction. Estimates by the EPA predict mass burning to account for 60 - 70 percent of the market through the year 2000 (1). Mass burning of refuse to produce steam is not a new concept. The first waterwall mass burning combustor was installed in the United States in 1967 (2). This unit represented a developed European technology, which had already been in use for some time. In 1971 Riley Stoker installed its first resource recovery system for the town of Braintree, Massachusetts. This furnace employs a traveling grate stoker developed for coal and wood. Since that time Riley Stoker has provided boilers for a number of MSW combustors. The current evolution of mass burning technology centers around more efficient combustion and emissions control. In 1984 Riley Stoker Corporation acquired the exclusive licensee of the Takuma MSW combustion technology in America. Takuma has designed and built over 70 MSW combustion facilities in Japan. To date Riley Stoker has designed and constructed four 100 ton/day MSW combustors at two locations incorporating the Riley-Takuma technology. Figure 1 shows the cross-sectional view of the Jackson County Michigan Facility. The Jackson County Facility includes a spray dryer and baghouse for acid gas and particulate control. The technology centers around the Takuma Stoker, a unique overfire air (OFA) system design, and the Automatic Combustion Control (ACC) system. The Takuma Stoker was developed to improve combustion efficiency by improving air and fuel distribution on the grate. The - OFA system uses three rows of OFA jets to promote mixing and 01130 1
Setname	uu_afrc
ID	4380
Reference URL	https://collections.lib.utah.edu/ark:/87278/s63j3ghm/4380