Modelling the Turbocharger Cut Off Application Due to Slow Steaming Operation 12RTA96C-B Engine
Out of the total operational costs of a ship, fuel costs account for by far the highest proportion. In view of the global economic situation and the rising oil prices, shipowners and charterers are looking for solutions to cut costs by reducing fuel consumption. Low load operation, also well-known as “slow steaming”, represents the currently most effective and popular measure to cut fuel costs and, in consequence, the total operational costs for increased competitiveness in the market. Low load operation is possible and there is an increasing trend to operate in these very low engine load ranges. As the engines were not designed for this operational condition, various retrofit modifications to the engine can compensate for this. By using low load operation, the reduction of the RPM gives problems when sailing at low speed. A turbocharger (TC) compresses inlet air to a high pressure and after cooling this compressed air it results in higher mass of air in the cylinder. But when running at a low power load this air reaches temperatures that are too low for an optimal combustion process. One of the solution comes from the company Wärtsilä. They install so called “low steam engine kits”. When this kit is installed it allows the engine operators to cut off one turbocharger of the engine, this result’s in a higher RPM for the operating turbochargers. When the remaining TC’s have a higher RPM their efficiency improves and gives the engine more air for combustion.The goal of this Bachelor thesis is to make a calculation modelling and prove that by switching off one or more turbocharger on the system will improve the efficiency in slow steaming operation. Beside that, this thesis is aims to estimated the performance of the engine in both operation condition.
. Andreas Wiesmann, General Manager Innovation & Business Development, Two-stroke, Wärtsilä Services. 2010. Slow steaming- a viable long-term option? Helsinki, Finlandia: Wartsilla Company.
. Bahadori, Alireza. 2011. "Energy Conversion and Management." Estimation of air specific heat ratio at elevated pressures using simple.
. Christiaan Muilwijk, Wouter den Boer, Laurens van der Kooij, Koen Stroomberg . March 31th 2011. Good speed is low speed - Efficient low speed sailing. Rotterdam, Netherland: Shipping and Transport College.
. Company, Dosoan Engine Product. n.d. Turbocharger Cut Out System. Seongsan-gu, Changwon-si, Gyeongsangnam-do, South Korea: Doosan.
. Company, GT Suite Product. 2015. GT Suite Software Overview. Westmont, USA: Gamma Technologies.
. Company, Tecumseh Product. 2015. "Detail compressor modeling and bottle cooler simulation." Frankfurt.
. Coorporation, MAN B&W. 2010. "MAN B&W K90MC-C6-TII Project Guide." Copenhagen.
. Jääskeläinen, Hannu. 2011. Diesel Exhaust Gas. https://www.dieselnet.com/tech/diesel_exh.php.
. Kleimola, Matti. n.d. "Turbocharger Efficiency." Definition and Guidelines for Measurment and Calculation.
. Korczewski, Prof. Zbigniew. 2015. "Exhaust Gas Temperature Measurements In Diagnostics Of Turbocharged Marine Internal Combustion Engines."
. Michael J.Moran, Howard N. Shapiro, Daisie_D.Bo. 1996. Gas Turbine Theory 4th Edition. London: Longman Group.
. Semin, Iswantoro A., Faris F. “Performance and NOx Investigation on Diesel Engine using Cold EGR Spiral Tube: A Review.” International Journal of Marine Engineering Innovation and Research., vol. 1, no. 3, Jun. 2017
. Zuhdi A., Busse W., Clausthaldi. “Fluid Flow Analysis of Jacket Cooling System for Marine Diesel Engine 93 KW”. International Journal of Marine Engineering Innovation and Research., vol. 1, no. 2, Mar. 2017
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