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Title: Low NOx modifications on front-fired pulverized coal fuel burners

Abstract

Burner optimizations and modifications were performed on Public Service of New Hampshire`s Schiller Units 4, 5, and 6. These are Foster-Wheeler 50 MWg pulverized coal and No.6 fuel oil-fired boilers with six burners each. Burner optimizations consisted of fuel flow, primary air, secondary air testing and balancing. Burner modifications consisted of the addition of circumferentially and radially staged flame stabilizers, circumferentially-staged coal spreaders, and modifications to the existing pulverized coal pipe. NO{sub x} emissions on Unit 6 of .41 lb/mmBtu were achieved at optimized burner settings at full load with all burners in service and without the use of overfire air or bias firing. This represented a 50% NO{sub x} reduction from the average pre-modification baseline NO{sub x} emissions of .81 lb/mmBtu prior to the optimizations and burner modification program. NO{sub x} emissions as low as .38 lb/mmBtu were achieved with the use of overfire air. There was essentially no quantifiable change in LOIs (baseline LOIs averaged 40%). Furnace excess O{sub 2} as low as 1.2% was achieved with CO emissions of less than 200 ppm. Total installed costs including the overfire air system were approximately $7/kW.

Authors:
;  [1];  [2]
  1. Public Service of New Hampshire, Manchester, NH (United States)
  2. RJM Corp., Ridgefield, CT (United States)
Publication Date:
Research Org.:
Electric Power Research Inst., Palo Alto, CA (United States)
OSTI Identifier:
269432
Report Number(s):
EPRI-TR-105978-V1; CONF-9505150-Vol.1
TRN: 96:003477-0009
Resource Type:
Technical Report
Resource Relation:
Conference: EPRI/EPA joint symposium on stationary combustion NO/sub x/ control, Kansas City, MO (United States), 16-19 May 1995; Other Information: PBD: Jan 1996; Related Information: Is Part Of Proceedings: EPRI/EPA 1995 joint symposium on stationary combustion NO{sub x} control: Volume 1, Tuesday, May 16, 1995, Sessions 1, 2, 3; PB: 148 p.
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; 20 FOSSIL-FUELED POWER PLANTS; FOSSIL-FUEL POWER PLANTS; BURNERS; MODIFICATIONS; PERFORMANCE; NITROGEN OXIDES; AIR POLLUTION CONTROL; BOILERS; OPTIMIZATION; COAL; COMBUSTION; EMISSION

Citation Formats

Owens, B, Hitchko, M, and Broderick, R G. Low NOx modifications on front-fired pulverized coal fuel burners. United States: N. p., 1996. Web.
Owens, B, Hitchko, M, & Broderick, R G. Low NOx modifications on front-fired pulverized coal fuel burners. United States.
Owens, B, Hitchko, M, and Broderick, R G. Mon . "Low NOx modifications on front-fired pulverized coal fuel burners". United States.
@article{osti_269432,
title = {Low NOx modifications on front-fired pulverized coal fuel burners},
author = {Owens, B and Hitchko, M and Broderick, R G},
abstractNote = {Burner optimizations and modifications were performed on Public Service of New Hampshire`s Schiller Units 4, 5, and 6. These are Foster-Wheeler 50 MWg pulverized coal and No.6 fuel oil-fired boilers with six burners each. Burner optimizations consisted of fuel flow, primary air, secondary air testing and balancing. Burner modifications consisted of the addition of circumferentially and radially staged flame stabilizers, circumferentially-staged coal spreaders, and modifications to the existing pulverized coal pipe. NO{sub x} emissions on Unit 6 of .41 lb/mmBtu were achieved at optimized burner settings at full load with all burners in service and without the use of overfire air or bias firing. This represented a 50% NO{sub x} reduction from the average pre-modification baseline NO{sub x} emissions of .81 lb/mmBtu prior to the optimizations and burner modification program. NO{sub x} emissions as low as .38 lb/mmBtu were achieved with the use of overfire air. There was essentially no quantifiable change in LOIs (baseline LOIs averaged 40%). Furnace excess O{sub 2} as low as 1.2% was achieved with CO emissions of less than 200 ppm. Total installed costs including the overfire air system were approximately $7/kW.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1996},
month = {1}
}

Technical Report:
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