NDLI: An Evaluation of Hybrid Coal Combustion Technology for Repowering H.F. Lee Unit 2

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Steven, J. Castagnero Richard, E. Weinstein Thomas, J. King Donald, L. Bonk Edward, B. Toll
Copyright Year	2003
Abstract	Combustion-based hybrid systems use coal as fuel, and employ combustion technologies in combination with a gas turbine in a number combined cycle configurations. One of these hybrid systems is known by its acronym: CHIPPS, for: ‘combustion-based high-performance power system.’ CHIPPS is a coal-fueled technology that is suited for repowering units that have boilers in good condition, as it continues the use of the existing furnace and steam tubes. This paper describes a conceptual evaluation to establish the feasibility of using CHIPPS technology to repower an existing coal-fired steam plant. The H.F. Lee power plant, owned by CP&L Progress Energy, is located on the Neuse River, just outside Goldsboro, North Carolina. CHIPPS would repower Unit 2, a 1950’s era non-reheat steam unit, one of the three units at this site. If CHIPPS repowering proved feasible for Unit 2, it would likely be a good choice for a wide range of other similar units throughout the U.S. CHIPPS retains the use of the existing Unit 2 furnace and steam turbine/generator, but adds a combustion turbine to increase energy efficiency in a way that makes this coal-fired plant nearly as efficient as a combined cycle power plant that would otherwise use more expensive natural gas. The CHIPPs technology concept used employs a Foster Wheeler circulating fluidized bed partial gasifier that would supply syngas to a General Electric 6B combustion turbine. Only a portion of the coal is gasified to syngas. The remaining coal energy is transferred as char to the lower of three boiler burner rows of the existing Unit 2 furnace that would be fitted with special burners for the char. The upper two rows are not changed and continue to burn coal from the existing mills. With CHIPPS: • Output is expected to increase from 78,520 kW to 139,750 kW, • 7 percent less fuel would be needed per kWh generated, • Environmental improvement would become exemplary, however, • Cost is high, about $214,606,000; Unit 2 is too small for attractive economics, and a non-reheat unit leads to only modest efficiency improvement. Future CHIPPS repowering might be better suited for a larger reheat steam plant instead of at H.F. Lee Unit 2. This paper summarizes the CHIPPS repowering power plant concept and describes: • An overview of the CHIPPS process; • A description of the existing H.F. Lee Unit 2; • An estimate of the performance improvements expected with Unit 2 repowered with CHIPPS; • An estimate of the environmental performance expectation from the unit with CHIPPS; and, • An estimate of the expected costs to upgrade the unit. Significant conclusions and suggestions for where this class of hybrid combustion technologies might best be applied.
Sponsorship	Advanced Energy Systems
Starting Page	91
Ending Page	97
Page Count	7
File Format	PDF
ISBN	0791836800
DOI	10.1115/FBC2003-142
e-ISBN	0791836754
Conference Proceedings	17th International Conference on Fluidized Bed Combustion
Language	English
Publisher Date	2003-05-18
Publisher Place	Jacksonville, Florida, USA
Access Restriction	Subscribed
Subject Keyword	Chipps Repowering Coal hybrid Fluidized bed combustion Combined cycle Coal Gas turbine Cfb Combustion technologies
Content Type	Text
Resource Type	Article

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