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The analysis of design limitations of the selected thermodynamic parameters of the working media in the marine waste energy recovery systems

Michalski R.

Journal of Polish CIMAC

2012

Vol. 7, no 1

159-166

The waste energy utilisation degree in the marine Diesel power plants grows as the exhaust gas boiler exhaust gas temperature decreases. The limitation in this case is not only a likelihood of sulphur corrosion occurrence in the boiler and exhaust gas ducts, but also the obtainment of too little, or altogether negative values of so called pinch point. The article presents the analysis of the limitations related with the pinch point and minimum boiler exhaust gas temperature which are possible for the acceptance at the stage of the preliminary design in terms of the system correct operation and its energetic effectiveness. The possible negative results of the exhaust gas boiler exhaust gas temperature reduction and the methods to prevent the results have been presented. In the effect of conducting the calculations for the selected thermodynamic parameters of a model waste energy recovery system there has been presented the graphic course of the changes in the achieved power of the steam turbine generator and the pinch point in exhaust gas boiler in relation to the boiler exhaust gas temperature, the generated steam pressure, recovery system feedwater temperature and the main engine exhaust gas temperature. The data presented in the article are but of general nature and reflect the relations between the selected thermodynamic parameters that characterise the model of the waste energy recovery system in the marine Diesel power plant.