Control of NO/sub x/ from coal-fired boilers: combustion-modification techniques. [Effect of boiler type, coal type and firing method]

Technical Report · Thu Oct 01 04:00:00 EDT 1981

OSTI ID:6676436

Huang, H S

The effectiveness of commercially available combustion-modification (CM) techniques and prospects for seven advanced CM methods now under development are evaluated in terms of controlling NO/sub x/ emissions in coal-fired boilers. Boiler types considered include single-wall-fired and horizontally opposed wall-fired, tangentially fired, and down-fired boilers; underfed, overfed, and spreader stokers; and cyclone units. Significant variations in NO/sub x/ emissions occur with boiler type, coal type, and firing method. Emission-control performance, cost, and operating characteristics are compared for the applicable CM techniques. This study finds off-stoichiometric, or staged, combustion (OSC) and low-excess-air operation to be the most cost-effective methods for existing units, while OSC and low-NO/sub x/ burners are best for new units. Further research is needed to resolve potential corrosion problems associated with low-NO/sub x/ operations. Advanced burner/boiler designs now under active development could lower NO/sub x/ emissions from coal-fired boilers to about 0.2 lb/10/sup 6/ Btu heat input. Present efforts to understand NO formation/destruction mechanisms and their interaction with operating characteristics of these new designs should be accelerated.

• Research Organization: Argonne National Lab., IL (USA)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 6676436
• Report Number(s): ANL/ECT-13; ON: DE83002344
• Country of Publication: United States
• Language: English

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AIR POLLUTION CONTROL
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CHALCOGENIDES
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DATA
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THERMAL POWER PLANTS