Canadian Maritime Section Discusses Paper On Waste Heat Recovery System

The second meeting of the 1977-78 season of the Canadian Maritime Section of The Society of Naval Architects and Marine Engineers was held at the Wandlyn Motel in Saint John, New Brunswick, on November 15,1977.

The guest speaker for the evening, E.P. Crowdy, presented his paper, "Waste Heat Conversion Plant for Use with Diesel and Gas Turbine Installation." The speaker started through basic thermodynamics and physical limitations such as sulphuric acid dew point to the ideal cycle and concluded that, theoretically, it was possible to recover from 7 to 121/2 percent of the waste heat of a slow speed diesel. According to the authors, this heat recovery would be viable provided that powers in excess of 10,000 hp were available. The waste heat recovery unit described by the authors is a self-contained generating plant comprising a condenser, steam generator, and vertically mounted steam turbine.

The author spent some time ex- plaining the unique characteristics of this turbine, which were as follows: (1) vertical mounting, (2) water lubricating thrust bearing, and (3) fabricated stainless steel rotor.

An interesting detail of this presentation was the manufacturing method for the turbine blades.

The turbine consisted of sandwiched turbine stages which were made of cast stainless steel. An unusual f e a t u r e was that the blades were machined by an electro- chemical process from the cast stainless steel, thus no residual strains or anchoring problems.

The unit itself is self-contained and is designed for fully automatic operation. The author pointed out that this system became viable as a result of the Arab oil price hike in 1973.

Following the presentation, a very active question period concluded the meeting. The author was precise and very well informed, and this allowed for a very interesting evening for all members.

Maritime Reporter Magazine, page 42, Jan 1978

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