A Study of Waste-Heat-Boiler Size and Performance of a Conceptual Marine COGAS System.
Abstract
The effect of waste-heat-boiler weight and volume on the performance of an LM2500-based combined gas and steam turbine system (COGAS) is examined. The boiler is a once-through type which is controlled to extract the maximum heat from the gas turbine exhaust and still maintain acceptable minimum wall temperature. At a gas turbine power of 12,000 hp (8.95 MW), the boiler without feed-water heating can produce sufficient steam to generate 2840 hp (2120 kW) at a turbine efficiency of 80%. This boiler, including diffuser, weighs 19,300 lbs (8770 kg) and has a gas side pressure drop of 9 in. H2O (2.2 kPa). With feed-water heating, the steam power can be increased to 4000 hp (2980 kW) with a boiler weight of 38,3000 lbs. (17,400 kg). The 24 and 33% respective increases in power for these two systems at cruise are translated to 15 and 20% improvement in fuel consumption over the LM2500 gas turbine at the higher power levels of the COGAS system. At the lower power levels, both COGAS systems yield a 20% improvement in fuel consumption over the basic gas turbine. Keywords: Waste-heat recovery, Waste-heat-boiler sizing, Gas turbine, Heat Transfer, and Steam bottoming cycle.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1980
- Accession Number
- ADA173434
Entities
People
- D. T. Knauss
- J. G. Purnell
- R. K. Muench