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Lokalne układy kogeneracyjne wyposażone w silniki parowe Spilling

100%

Liebmann W. , Żórański T.

tom nr 124

75-82

Wytwarzanie pary technologicznej w wyniku spalania drewna jest procesem, przy którym jednoczesne wytwarzanie energii elektrycznej jest możliwe i uzasadnione tak pod względem ekonomicznym jak i technicznym. Moc cieplna i elektryczna zaprojektowanego układu kogeneracyjnego musi być dostosowana do lokalnych potrzeb energetycznych oraz możliwości pozyskania surowca.

Flow computations and experimental investigation of exhaust hoods

75%

Tajć L. , Polansky J. , Knourek J. , Feldberg L. A.

1999

tom nr 115

371--378

The results are presented here of a piece of experimental research, the aim of which was to find the most suitable shapes of all parts of the double-flow design of the exhaust hood in a steam turbine. Various forms of the walls of the casing and their influence upon the loss coefficient are described. Attention was paid to the process of blowing the steam into the boundary layer on the wall of the diffuser and stating the overall loss. The computations of the flow in the diffuser proper are presented and the influence of the density of the grid and the influence of the rotation of flow are shown. The actual inlet flow parameters are taken into consideration.

Identification of waste heat energy sources of a conventional steam propulsion plant of an LNG carrier

63%

Adamkiewicz A. , Grzesiak S.

2019

tom Vol. 40, no 3

195--210

This paper presents the origins of marine steam turbine application on liquefied natural gas carriers. An analysis of alternative propulsion plant trends has been made. The more efficient ones with marine diesel engines gradually began to replace the less efficient plants. However, because of many advantages of the steam turbine, further development research is in progress in order to achieve comparable thermal efficiency. Research has been carried out in order to achieve higher thermal efficiency throughout increasing operational parameters of superheated steam before the turbine unit; improving its efficiency to bring it nearer to the ideal Carnot cycle by applying a reheating system of steam and multi stage regenerative boiler feed water heating. Furthermore, heat losses of the system are reduced by: improving the design of turbine blades, application of turbine casing and bearing cooling, as well as reduction in steam flow resistance in pipe work and maneuvering valves. The article identifies waste energy sources using the energy balance of a steam turbine propulsion plant applied on the liquefied natural gas carrier which was made out basing on results of a passive operation experiment, using the measured and calculated values from behavioral equations for the zero-dimensional model. Thermodynamic functions of state of waste heat fluxes have been identified in terms of their capability to be converted into usable energy fluxes. Thus, new ways of increasing the efficiency of energy conversion of a steam turbine propulsion plant have been addressed.