Current and advanced NO/sub x/-control technology for coal-fired industrial boilers
A NOx-control-technology assessment study of coal-fired industrial boilers was conducted to examine the effectiveness of combustion-modification methods, including low excess air, staged combustion, and burner modifications. Boiler types considered included overfed and underfed stokers, spreader stokers, pulverized-coal and coal-fired cyclone units. Significant variations in NOx emissions occur with boiler type, firing method, and coal type; a relative comparison of emission-control performance, cost, and operational considerations is presented for each method. Baseline (as-found) emissions from grate-fired stokers were shown to be in the range of 200 to 300 ppM. Similarly, as-found emissions from suspension-fired units were quite low (350 to 600 ppM) as compared to comparably designed utility-sized units. Low excess air was shown to be the most effective method on existing units, reducing emissions by approximately 10%. Evaluation of staged combustion and burner modification, however, were limited due to current boiler designs. Major hardware modification/design and implementation are necessary before the potential of these techniques can be fully evaluated. The study emphasized the numerous operational factors that are of major importance to the user in selecting and implementing a combustion-modification program, including energy considerations, incremental capital and operating costs, corrosion, secondary pollutants, and retrofit potential.
- Research Organization:
- KVB, Inc., Tustin, CA (USA)
- DOE Contract Number:
- W-31-109-ENG-38
- OSTI ID:
- 6085645
- Report Number(s):
- ANL/ECT-4
- Country of Publication:
- United States
- Language:
- English
Similar Records
Environmental control implications of generating electric power from coal. 1977 technology status report. Appendix D. Assessment of NO/sub x/ control technology for coal fired utility boilers. [Low-excess-air, staged combustion, flu gas recirculation and burner design]
Thirty-day field tests of industrial boilers: site 1 - coal-fired spreader stoker. Final report, March 1979-March 1980
Related Subjects
54 ENVIRONMENTAL SCIENCES
BOILERS
AIR POLLUTION CONTROL
NITROGEN OXIDES
BURNERS
FUEL-AIR RATIO
INDUSTRIAL PLANTS
CHALCOGENIDES
NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
010800* - Coal
Lignite
& Peat- Waste Management
500200 - Environment
Atmospheric- Chemicals Monitoring & Transport- (-1989)