Thursday, Dec 16, 2010 at 18:52
The MAN 51/60DF engine
For power-generation applications, the 51/60DF is available in a nine-cylinder, inline version and in vee-configuration versions with 12, 14 and 18 cylinders. The engines have mechanical ratings of 1,000 kW per cylinder for 60-Hz power generation (514 rpm) and 975 kW for 50-Hz applications (500 rpm). These give an overall generator-set rating range of 8,560 to 17,550 kWe.
With its fuel flexibility and low emissions, the MAN 51/60DF engine targets applications where operation on a back-up fuel is either essential or desirable. The engine’s fuel flexibility centres on the capability to operate on either gaseous or liquid fuel, and to switch between them seamlessly at full-rated output. In the gaseous-fuel mode, an air-gas mixture is ignited by injection of distillate diesel fuel. On the 51/60DF, the liquid fuel micro-pilot amounts to 1% of the quantity of liquid fuel needed to achieve full-rated output.
It is injected via a common-rail system that allows flexible setting of injection timing, duration and pressure for each cylinder. This flexibility allows the engine to achieve low emissions and to respond rapidly to combustion knock signals on a cylinder-by-cylinder basis. In back-up, liquid-fuel mode, the 51/60DF engine operates as a normal diesel engine injecting distillate or heavy fuel oil (HFO) through a separate, normally dimensioned injector in a camshaft actuated, pump-line-nozzle system. At 500 mg/mn3 at 5% O2 on gaseous fuel, the 51/60DF readily achieves emissions of oxides of nitrogen (NOx) in compliance with both Germany’s TA Luft clean-air regulations and the World Bank Pollution Prevention and Abatement Handbook.
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