Utility experience of Phase I compliance on Chalk Point Unit 2
- Stone & Webster Engineering Corporation, Cherry Hill, NJ (United States)
- Potomac Electric Power Company, Washington, DC (United States)
Potomac Electric Power Company`s Chalk Point Generating Station Unit 2 has recently undergone a retrofit to comply with Phase I of the 1990 Clean Air Act Amendments (CAAA) Title IV requirements. The approach taken was to install low NOx burners and overfire air to reduce NOx emissions and switch to lower sulfur coal to comply with Phase I sulfur dioxide (SO{sub 2}) emission limits. This approach was chosen based on a unique combination of sophisticated tools, boiler modeling, experience, testing, and cooperation between the Owners, Engineers, and the equipment Manufacturers. The result was a project performed at a reasonable cost and minimum risk to plant reliability and performance while meeting the specified requirements of the regulations. The Unit 2 retrofit will be followed by the retrofit of its identical sister unit, Unit 1, in the late fall of 1994. In addition to the Low NOx system retrofit and coal switching, a new distributed control system (DCS), burner management system (BMS), new ignitors, and the capability to fire natural gas on both main burners and ignitors was added. A four month outage was followed by a series of optimization tests which were designed to reduce the emissions to the compliance limit while minimizing impacts on the boiler operation. After boiler startup, burner and pulverizer performance adjustments were required resulting in dramatic improvement in both boiler and burner performance. This paper describes the approach towards achieving CAAA compliance and the net results: impacts of the Low NOx system and the Phase I coal on the boiler and auxiliary plant equipment and the adjustments which had to be made to eliminate initial operating problems. Results of months of optimization testing are presented as related to emissions, furnace slagging, flame shape, unburned carbon, steam temperatures, and tube metal temperatures.
- Research Organization:
- Electric Power Research Inst. (EPRI), Palo Alto, CA (United States); Reaction Engineering International, Salt Lake City, UT (United States)
- OSTI ID:
- 83337
- Report Number(s):
- EPRI-TR-104982; CONF-9408200-; TRN: 95:005151-0030
- Resource Relation:
- Conference: 4. EPRI conference on the effect of coal quality on power plants, Charleston, SC (United States), 17-19 Aug 1994; Other Information: PBD: Mar 1995; Related Information: Is Part Of Effects of coal quality on power plants: Fourth International Conference. Proceedings; Harding, N.S. [ed.] [Reaction Engineering International, Salt Lake City, UT (United States)]; Mehta, A.K. [ed.] [Electric Power Research Inst., Palo Alto, CA (United States)]; PB: 776 p.
- Country of Publication:
- United States
- Language:
- English
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