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2 Michalski R.

2 2012

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The methods of the evaluation of the waste energy recovery systems in the marine Diesel power plants

Michalski R.

Zeszyty Naukowe / Akademia Morska w Szczecinie

2012

nr 32 (104) z. 1

34-41

The article presents the general description of the waste energy recovery systems in the marine Diesel power plants. Both, the simple as well as the complex recovery systems have been discussed. The substantial part of the article concerns the overview of the evaluation methods of the recovery systems arrangements. There have been presented the rudiments of the thermodynamic evaluation which in the effect provides the material for the determination of the energetic and exergetic efficiency of the recovery systems. The significant issue is also the description of the method of the arrangements economic evaluation, including the method of the determination of the annual profit ensuing from the operation of the waste energy recovery system and the dynamic methods of the economic analysis with the particular emphasis on the investment outlay payback period index. There have been presented the examples of the dependence of the waste heat turbo-generators on the main engine power output, the estimated payback times of the investment outlays incurred in connection with the discussed systems and the payback time of the outlays with reference to the main engine power output in the function of its power output.

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.