Abstract
An energy and exergy analysis of the condensate pump from the marine steam propulsion system during the condensate leakage between pump stages is presented in this paper. Measurements from the steam propulsion system during exploitation were necessary for collecting all the data for the condensate pump analysis. Due to condensate leakage inside the pump casing, the producer specified condensate pressures at the pump outlet could not be obtained during the exploitation. Low condensate pressure at the pump inlet and condensate temperature slightly above the atmospheric significantly influences the pump exergy analysis. Increase in pump load resulted in an increase of pump energy and exergy losses and efficiencies. In the observed load range during the leakage, pump energy losses are between 19.88 kW and 24.78 kW, while pump energy efficiencies are between 11.12 % and 41.54 %. Pump exergy losses are slightly higher, while exergy efficiencies are slightly lower when compared to energy losses and efficiencies. During normal operation, without leakage, the pump energy efficiencies are from 5 % to 20 % higher in comparison with pump operation when the leakage occurs.
Highlights
Diesel engines have a dominant role in marine propulsion if the entire world fleet is taken into account
Measurements of the required operating parameters have been performed during the steam propulsion system exploitation
The reason for the condensate inlet volume flow calculation has been its usage in equation (1), in order to compare the results of the pump energy efficiency change obtained by this analysis with the producer test data
Summary
Diesel engines have a dominant role in marine propulsion if the entire world fleet is taken into account. Marine steam propulsion systems are only slightly present in the entire world fleet, but still they are dominant propulsion systems of LNG (Liquefied Natural Gas) carriers [7] due to specificity of LNG carrier operation and transported cargo. New systems for LNG carrier propulsion, partially based on steam turbines, are today under the development [8]. Such propulsion systems are very complex, so they require proper power management systems [9], decision support systems (usually multi-objective) [10] as well as appropriate maintenance systems [11]. Improvements on LNG carriers do not include only the propulsion system, but they include optimal manipulation and management of the transported cargo [12]
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