19。62 MW at 91 r/min。 The auxiliary engines are three four-stroke DEs developing each one  a maximum power of 900 kW。

The ship requirements in seagoing conditions are as follows:

●For the propulsion power demand: engine power at NCR  working  conditions  (90%  of   MCR): 17,658 kW。 This power is required for a ship speed of 16。2 knot at design draught, heavy running (with 15% sea margin) or 16。8 knot at design draught, light running。

●For the electric power demand: the pertinent    data

are reported in Table 2。 On the basis of the ship- owner indications, it has been considered that the ship  will  work  270 days  per  year,  70%  of    that

(189 days)  in  normal  seagoing  condition  and the

remaining 30% (81 days) in normal seagoing with tank heating condition。

●For  the  thermal  power  demand  (service  steam    in 来,自.优;尔:论[文|网www.youerw.com +QQ752018766-

Figures 1 and 4): thermal users need a saturated steam flow  rate of 1。4 t/h at a  pressure of  at  least 7 bar。 This estimate does not take into account the steam required to heat the load (tank heating)。 This is because such a user requires a steam flow rate of about 35 t/h, therefore incompatible with the steam producible from any heat recovery boiler。

Original WHR plant layout

As mentioned before, the authors’ work starts from the analysis of a WHR plant layout equipped with a typi- cal steam plant,7 basic scheme of which is presented in Figure 1。 Mainly, the DE exhaust gases supply two groups of gas turbines in parallel: the turbocharging set (turbocharger in Figure 1) and a power  gas  turbine (gas turbine)。 The power produced by this last turbine can be used for the generation of additional electric power or to increase the propulsive power。 The exhaust gases of both group of turbines feed a   double-pressure

HRSG, which is the main component of a steam plant for heating services and power production。 The DE jacket water is used to preheat the condensate water coming from the condenser and going to the hot well tank。 The scavenge air compressed by the turbocharger provides heat to the low-pressure (LP) preheater and is subsequently cooled down by the central cooler up to a temperature suitable to enter the cylinders。