Samenvatting

This research is performed to give an advice for the current problem of Canada Feeder Lines regarding the purifier installation. This research has given an answer to the following main question:
‘’What is the best way to improve the cost-effectivity of the purifier installation on board of a 10.000 DWT ship of CFL?’’
On each of the six ships of the Sole series from Canada Feeder Lines containing the Momentum Scan, Marvel Scan, Motion Scan, Industrial Maya, Industrial More and Industrial Merchant, is a main engine installed which is lubricated by oil. The oil that is used for direct lubrication is stored in the sump tank below the main engine. There is also a cleaning system connected in parallel to the lubrication line one the sump tank. This cleaning system contains a purifier who is only able to clean the lubrication oil properly if the oil temperature is 95°C or higher. In the sump tank, the oil temperature is normally about 60°C. A heat exchanger is placed in the circuit between the purifier and the sump tank to heat the oil before the cleaning process. Unfortunately the capacity of this heat exchanger is not enough to heat the oil out of the sump tank to the minimum required inlet temperature of 95°C with the current water temperatures of the heating system when the main engine is not running and the oil temperature in the sump tank drops too far.
Continuing the purifying of the lubrication oil while the main engine is not running will have cleaner lubrication oil as result because the main engine will not foul the oil while the cleaning process continuous. Cleaner lubrication oil will reduce the wear of the main engine (H.Wytzes, 1998).
To solve this problem, three solutions have been found and investigated:
1. Replacing the current heat exchanger by a heat exchanger with more capacity or expanding the capacity of the current heat exchanger
2. Heat recovery by using the returning lubrication oil temperature
3. Reduction of the oil flow
To determine which method is the most cost-effective, measurements have been done. After the measurements calculations are made. The outcome of the research results in three available options with heat recovery by using the returning lubrication oil temperature as the most suitable. The answer to the main research question is that all three options will increase the availability of the purifier installation but only the option based on using the returning oil for heat recovery will increase also the efficiency of the purifier installation on board of the 10.000 DWT ships of Canada Feeder Lines. Therefore this option appeared to be the best cost-effective solution.