Maintaining low-NO{sub x} emissions after your burner retrofit
- Spectrum Diagnostix, Inc., Andover, MA (United States)
- PSI Technologies, Andover, MA (United States)
To achieve NO{sub x} reduction requirements, utilities are retrofitting their coal-fired boilers with either combustion and post-combustion NO{sub x} control systems. For either system, controlling the gas composition, temperature, and residence time where NO{sub x} is reduced determines the success of the retrofit. Creating the optimum conditions for NO{sub x} reduction over a wide range of operating conditions is difficult due to normal changes in coal and air feeding systems, burners, and furnace conditions. While such changes used to create only minor operating problems, with low-NO{sub x} systems the result can be NO{sub x} emissions outside the compliance limits or costly operational impacts (e.g. high flyash carbon or ammonia salt deposition on air heater surfaces). To maintain low-NO{sub x} emission requires an advance in burner and furnace monitoring and control technology. This paper discusses the results of demonstration tests at New England Power and Alabama Power of two advanced monitoring techniques: flame signature scanning for burner balancing and tuning, and continuous gas temperature monitoring for controlling furnace exit and convective pass temperatures. The combination of these advanced monitoring techniques with automatic or manual control systems will enable utilities to maintain low-NO{sub x} emissions when using low-NO{sub x} burners or SNCR.
- Research Organization:
- Electric Power Research Inst. (EPRI), Palo Alto, CA (United States)
- OSTI ID:
- 269442
- Report Number(s):
- EPRI-TR-105978-V2; CONF-9505150-Vol.2; TRN: 96:003478-0007
- 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 2, Wednesday, May 17, 1995, Sessions 4 and 5; PB: 229 p.
- Country of Publication:
- United States
- Language:
- English
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