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Influence of the cruising speed of a ship on exhaust gas boiler efficacy

Krzyżanowski J.

Journal of Polish CIMAC

2012

Vol. 7, no 1

133-140

The paper presents simulation calculations for a ship’s power transmission system and the associated exhaust gas boiler with the aim of assessing the boiler’s efficacy. Increasing prices of marine fuels force ship owners to limit the cruising speed of ships. This has negative impact on the operation of an exhaust gas boiler powered with exhaust fumes from the main engine. The boiler’s capacity decreases, seriously limiting the tasks ascribed to vapour. Simulation calculations were conducted for the most typical system used on sea ships, i.e. a multi-turn engine and the associated exhaust gas boiler which generates saturated vapour. Adopting several values of ship cruising speed, which were smaller than the nominal speed, was a starting point for he calculations. Main engine powers were calculated with partial loads. Next, relevant values of excess air number were assigned to those powers and classic combustion calculations were conducted with the use of stochiometric combustion equations. For assumed fumes temperatures in front of and behind the boiler drops in fumes enthalpy were noted. It enabled to calculate the values of heat fluxes released by the fumes in the boiler. After adopting relevant vapour parameters boiler capacities were evaluated as appropriate. Results of those calculations are shown in tables and on the graphs. The summary of the paper includes conclusions and suggestions which may be helpful as far as designing waste heat recovery systems is concerned.