Auxiliary Engine (Generator Set) · Auxiliary Engines
Marine auxiliary engines like the 7LH21/32-GS-50Hz are commonly used in ships to provide reliable power for electrical systems when the main propulsion engines are not in use. This engine operates at 750 rpm and has a power output of 1400 kW, capable of running on Marine Diesel Oil (MDO) or Heavy Fuel Oil (HFO) up to 700 cSt at 50°C. It features a 7-cylinder configuration, with each cylinder having a bore of 210 mm and a stroke of 320 mm, resulting in a compression ratio of 17:1 and a maximum combustion pressure of 200 bar. The engine’s dry weight is 16.7 tons and it produces a genset output of 1330 kW and 1662 kVA at 50 Hz frequency. The specific fuel oil consumption (SFOC) ranges from 182 to 187 grams per kilowatt-hour at 720 to 1000 rpm. Common maintenance issues include piston cooling nozzle blockage, crankcase oil mist build-up due to blow-by from defective piston rings, exhaust valve seat erosion, and fuel injection nozzle coking, all of which require regular inspection and timely intervention to ensure optimal performance and longevity.
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