The paper describes some of the design considerations given to the application of gas turbines to the Canadian Coast Guard Icebreaker, The Norman McLeod Rogers. The completion of the sea trials of the Norman McLeod Rogers in September 1969 marked the introduction of the gas turbine as a prime mover candidate for ice breaking service in Canada. The Herman McLeod Rogers is the latest of a series of Canadian Coast Guard Icebreakers built in Canadian shipyards and notable among them are the John. A. MacDonald and the Louis St. Laurent, participants in the Manhattan voyage of the summer of 1969. The propulsion system chosen for the Norman McLeod Rogers was a combination of diesel and gas turbine electric with a rated shaft power of 13200 BHP. It is the intention of this paper to discuss in some detail the development considerations given the gas turbine portion of this power plant. Gas turbine development does not occur only on the drawing board. It is also a process of applying experience to new environments and new tasks. Such was the case with the gas turbines for the Norman McLeod Rogers. Prior to 1969 Westinghouse Canada Limited had two gas turbines of the 4000 HP class, known as the W-41 frame, in service for six years in a pipeline compressor application. The operating history of these turbines had been excellent and with the exception of the marine environment they had undergone a service profile somewhat similar to that expected in ice breaking service. They had been subjected to rapid applications of load during initial loading which is often a characteristic of a single shaft turbine in pipeline service and arises from the need to overcome the head on the pipeline when the control valves are redirected from 'recycle' to 'on line.' With the certainty of basic product integrity in the W-41 frame attention was then given to the actual turbine requirements for the ice breaking application. The rating selected for this application was 4000 HP at I.S.O. (sea level and 60 deg F) with inlet and exhaust losses totaling approximately four inches of water. In view of the contractual requirements to provide the maximum in life and reliability, the firing temperature was reduced to 1350 deg F thereby extending blade life and producing less distortion of structural components over the long haul.
Icebreaking with a gas turbine generator drive
Eisbrecher mit Gasturbinenantrieb
1973
26 Seiten, 6 Bilder, 1 Tabelle, 4 Quellen
(+ S. 237 Discussion)
Aufsatz (Konferenz)
Datenträger
Englisch
Springer Verlag | 2022
|