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Title	Low-NOx DRB-XCL PC Burners for Plug-in Retrofit Applications
Creator	Sarv, Hamid ; LaRue, Albert D.
Publisher	Digitized by J. Willard Marriott Library, University of Utah
Date	1997
Spatial Coverage	presented at Chicago, Illinois
Abstract	Many conventional wall-fired boilers use fast mixing and high velocity pulverized coal (PC) circular burners which generate high NOx emissions. Significant down time and expenses can be associated with boiler modifications to retrofit the smaller diameter high velocity burners with the larger throat and lower velocity low - NOx burners. Development of an effective plug-in low - NOx burner that easily replaces a high - NOx burner would provide a more cost-effective means of meeting the emissions regulations. A plug-in adaptation of the commercially successful Babcock & Wilcox (B&W) DRB-XCL ® low - NOx PC burner was developed and optimized at 100 million Btu/hr in a large-scale pilot facility with a high volatile eastern bituminous Ohio Mahoning coal. Effects of excess air, thermal load, and fuel variations on the combustion and emissions performance of the burner were investigated. The plug-in DRB-XCL ® PC burner can meet or exceed existing requirements for NOx, CO, and LOI (loss on ignition) in low - NOx retrofits. At a typical operating condition of 17% excess combustion air (3.2% stack 02) and without an overfire air system, average NOx, CO, and LOI values for a plug-in and swirler-equipped configuration were 249 PPMV (0.34 lb NO2/10^6 Btu), 11 PPMV , and 1.9%, respectively. The success of these tests enables commercial use of the DRB-XCL ® PC burners in plug-in applications.
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/s6f47rrj
Setname	uu_afrc
ID	14043
Reference URL	https://collections.lib.utah.edu/ark:/87278/s6f47rrj

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Title	Page 6
Format	application/pdf
OCR Text	Show RESULTS T w o high volatile eastern bituminous Ohio coals were used in these tests. Table 1 lists the representative proximate, ultimate, and heating value analyses of the coal samples. Pulverized coal samples were extracted from the PC-laden stream after the mill (before the filterhouse) according to the A S M E P T C 4.2 procedure. Mass percentage of as-fired P C particles passing through a 200 mesh screen (<74 urn) was checked by screening the collected sample every time that coal was pulverized. Table 2 lists the 16 to 200 sieve (1190 to 74 u m ) cut sizes for the nominal 7 0 % through a 200 mesh screen PC. Table 1. Coal Analysis Proximate Fixed Carbon (%) Volatile Matter (%) Moisture (%) Ash (%) Fixed Carbon/Volatile Matter Ultimate Carbon (%) Hydrogen (%) Nitrogen (%) Sulfur (%) Oxygen (%) Heating Value (Btu/lb) Mahoning 7A 51.47 37.64 5.37 5.52 1.37 73.71 4.98 1.49 1.56 7.37 13267 Meigs Creek 9 45.90 38.52 2.40 13.18 1.19 67.05 4.78 1.10 3.98 7.51 12056 Table 2. Typical PC Size Distribution Mesh Designation and Size Screen # (um) 16(1190) 30 (595) 50 (297) 70(210) 100(149) 140(105) 200 (74) Mahoning 7A Meigs Creek 9 Percent Smaller 100.00 99.98 99.60 98.40 93.50 84.40 70.30 100.00 100.00 99.80 99.20 96.20 88.10 74.60 6
Setname	uu_afrc
ID	14037
Reference URL	https://collections.lib.utah.edu/ark:/87278/s6f47rrj/14037