On the possible increasing of efficiency of ship power plant with the system combined of marine Diesel engine, gas turbine and steam turbine in case of main engine cooperation with the gas turbine fed in series and the steam turbine

Abstract

The article presents a concept of a combined large power ship propulsion system consisting of the leading Diesel main engine, associated with a power gas turbine and the steam turbine system which utilise the energy contained in the exhaust gas leaving the Diesel engine. In the examined variant of the combined system the power turbine is fed in series with the exhaust gas. A calculation algorithm is given along with the results of calculations of particular subsystems of: the turbocharging system, the power gas turbine, and the steam turbine cycle. Assumptions

Analysis of Possible Application of High-Temperature Nuclear Reactors to Contemporary Large-Output Steam Power Plants on Ships

“…Engines of the type, i.e. internal-combustion ones, are characterized by a high efficiency of the order of 51% [3,11,12]. Their huge popularity in shipbuilding results from economic conditions, namely, relatively low investment cost , low specific fuel combustion, possible charging with cheap heavy fuel oil.…”

“…Piston engines have also some disadvantages such as large mass of power plant , generation of nuisance vibration , long start-up period as well as emission of gas black and sulphur oxides in case of heavy oil charging. Aspects of emission of noxious substances negatively influence profitability of low-speed engines as regulations limiting exhaust gas emission level become more and more restrictive [3,11,12,14].…”

“…The aims can be reached by applying balanced energy conversion which becomes more and more popular both in the case of conventional fuels and alternative ones [2]. As far as sea transport has been concerned this means perfecting the combustion engine power plants and combined systems [3,11,12], improving operational parameters of gas turbines [13] and steam thermal cycles [8], developing novel systems based on fuel cells -SOFC [14] as well as making use of nuclear energy [15]. Special attention should be paid to HTR nuclear reactors.…”

The Experimental Identification of the Dynamic Coefficients of two Hydrodynamic Journal Bearings Operating at Constant Rotational Speed and Under Nonlinear Conditions

“…4 clearly indicates a phenomenon called "whirl". [10]. It should be stressed that dynamics of the rotating system are affected not only by the coupling and bearings but also by the whole supporting structure [2].…”

“…Article [10], provides one example of how complex such a system can be and how its efficiency can be increased using a combination of different devices, i.e. Diesel engine, gas turbine and steam turbine.…”