Efficient gas stream cooling in Second-Generation PFBC plants
Conference
·
OSTI ID:10167206
- Foster Wheeler Development Corp., Livingston, NJ (United States)
The coal-fueled Advanced or Second-Generation Pressurized Fluidized Bed Combustor concept (APFBC) is an efficient combined cycle in which coal is carbonized (partially gasified) to fuel a gas turbine, gas turbine exhaust heats feedwater for the steam cycle, and carbonizer char is used to generate steam for a steam turbine while heating combustion air for the gas turbine. The system can be described as an energy cascade in which chemical energy in solid coal is converted to gaseous form and flows to the gas turbine followed by the steam turbine, where it is converted to electrical power. Likewise, chemical energy in the char flows to both turbines generating electrical power in parallel. The fuel gas and vitiated air (PFBC exhaust) streams must be cleaned of entrained particulates by high-temperature equipment representing significant extensions of current technology. The energy recovery in the APFBC cycle allows these streams to be cooled to lower temperatures without significantly reducing the efficiency of the plant. Cooling these streams would allow the use of lower-temperature gas cleanup equipment that more closely approaches commercially available equipment, reducing cost and technological risk, and providing an earlier path to commercialization. This paper describes the performance effects of cooling the two hottest APFBC process gas streams: carbonizer fuel gas and vitiated air. Each cooling variation is described in terms of energy utilization, cycle efficiency, and cost implications.
- Research Organization:
- Foster Wheeler Development Corp., Livingston, NJ (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC21-86MC21023
- OSTI ID:
- 10167206
- Report Number(s):
- DOE/MC/21023--94/C0345; CONF-941024--1; ON: DE94015290; BR: AA1510050/AA3510100
- Country of Publication:
- United States
- Language:
- English
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