Company founded 1975 US-based machinery business experienced in worldwide sales.

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Wartsila, 20V34SG, Gas Power Plant, 20 Cylinders, 750 RPM, 131500kg

Description

  1. Overview
    1. Complete Wartsila gas power plant including the building
    2. Power generation section
    3. Generating set: Wartsila 20V34SG engine and generator mounted on a common base frame
    4. Common base frame is flexibly mounted on a concrete foundation by means of steel springs
    5. Generating set main dimensions: length 12700 mm, width 3300 mm, height 4650 mm, weight 131,500 kg
    6. Dimensions and weight may vary depending on the generator make and type
  2. Engine General Description
    1. Two Wartsila 20V34SG engines
    2. Four stroke, lean burn, pre chamber, spark ignited, port injected, trunk piston, turbocharged and intercooled design
    3. Embedded engine control system controlling combustion process individually in each cylinder
    4. Designed for continuous operation in gas mode at any load between 40-100% of nominal power
    5. Can be operated at 25-40% load for a maximum of 2 hours, after which load should be increased to above 70%
  3. Engine Main Data
    1. Configuration: V engine form
    2. Number of cylinders: 20
    3. Cylinder bore: 340 mm
    4. Stroke: 400 mm
    5. Speed: 750 rpm
    6. Mean piston speed: 10.00 m/s
    7. Mean effective pressure: 19.8 bar
    8. Swept volume per cylinder: 36.3 dm3
    9. Compression ratio: 12:1
    10. Number of inlet valves: 2
    11. Number of outlet valves: 2
    12. Direction of rotation faced towards flywheel: clockwise
    13. Length: 9276 mm
    14. Width: 3300 mm
    15. Height: 4650 mm
    16. Weight: 76,400 kg
    17. High degree of function integration requires only minimum external system support
  4. Engine Block
    1. Made of nodular cast iron, stiff and durable design, cast in one piece
    2. Carries the underslung crankshaft
    3. Main bearing caps fixed from below by two hydraulically tensioned studs, fixed sideways by hydraulically tensioned horizontal side studs
    4. Inlet air receiver and cooling water and lubricating oil channels integrated into the engine block
    5. Provided with an oil sump mounted against the engine block and sealed by an o-ring gasket
  5. Crankshaft
    1. Forged from one piece of high tensile steel
    2. Counterweights fitted on the crankshaft webs
    3. High degree of balancing results in even and thick oil film for all bearings
    4. Main bearings and crankpin bearings have steel backing and soft running layer with excellent corrosion resistance
  6. Connecting Rod
    1. Drop forged, totally machined type
    2. Three-piece design with horizontal split at the crankpin bearing and flanged connection to the rod
    3. Oil supply for piston cooling, gudgeon pin bush and piston skirt lubrication through a single drilling in the connecting rod
  7. Cylinder Liner
    1. Centrifugally cast iron with special alloy elements for wear resistance and high strength
    2. Stiff bore cooled collar design, supported symmetrically at the top of the engine block
    3. Equipped with an anti-polishing ring at the top preventing bore polishing
  8. Piston
    1. Consists of an oil cooled steel crown bolted onto an aluminium skirt
    2. Piston crown has two compression rings and one oil scraper ring
    3. Piston skirt and cylinder liner lubricated by a patented pressurized lubricating system utilizing lubricating nozzles in the piston skirt
  9. Cylinder Head
    1. Made of nodular cast iron
    2. Ample height and stiff design allow only four hydraulically tightened studs to fix the cylinder head onto the cylinder block/liner
    3. Each cylinder head has two inlet and two exhaust valves, all equipped with rotators
    4. Exhaust valve seat rings are water cooled
  10. Camshaft and Valve Mechanism
    1. Cams integrated in the drop forged camshaft material
    2. Bearing journals made of separate pieces fitted to camshaft sections by flanged connections, allowing lateral dismantling
    3. Camshaft bearings located in integrated bores in the engine block casting
    4. Camshaft driven from the crankshaft through a fully integrated gear train
  11. Gas Fuel Admission System
    1. Gas supplied via header pipes along the engine, continuing with individual feed pipes to the main gas admission valve on each cylinder head
    2. Separate header pipes feed gas to the prechamber gas valves
    3. Gas admission controlled with main gas valves for the main charge and pre-chamber valves for the pre-chamber gas
    4. Main gas valves are direct actuated solenoid valves controlled by the engine control system
    5. Pre-chamber valves are mechanically activated from the camshaft
    6. System comprises: gas pipes made of stainless steel, electronically actuated main gas valve, camshaft actuated pre-chamber gas valve
  12. Ignition System
    1. Ignition module located on top of each cylinder head cover contains the ignition coil
    2. Module connected to the spark plug with a high voltage extension
    3. Spark plug is high energy type, specially manufactured for use in gas engines
    4. Spark plug located in the prechamber, timing controlled by the engine control system
  13. Lubricating Oil System
    1. Lubricates main moving parts of the engine and cools the piston tops
    2. Engine has a wet lubricating oil sump
    3. System comprises: pipes made of steel, oil sump of wet type, engine driven main lubricating oil pump with pressure regulating valve, pre-lubricating pump with electrical motor, lubricating oil cooler, lubricating oil thermostatic valve, lubricating oil automatic back-flushing fine filter with integrated safety filter, centrifugal filter to clean back-flushing oil from automatic filter, start up/running in filters, non-return valves in oil supply pipes, crankcase ventilation pipe
  14. Starting Air System
    1. Engine started by compressed air with nominal pressure of 30 bar
    2. Start performed by direct injection of air into cylinders through starting air valves in the cylinder heads
    3. System comprises: pipes made of steel, starting air master valve electrically and manually operated, start blocking valve to prevent starting when turning gear is engaged, starting air distributor, starting air valves in a-bank cylinder heads, slow turning device, flame arrestors
  15. Cooling Water System
    1. Engine cooling system divided into three circuits: jacket cooling circuit, 1st stage charge air cooler circuit, 2nd stage charge air cooler circuit
    2. System comprises: pipes made of steel, engine driven pump for jacket cooling circuit, engine driven pump for low temperature cooling circuit, non-return valves after circulating pumps
  16. Combustion Air System
    1. Compressor side of the turbocharger feeds air into the cylinders via the charge air cooler
    2. Engine is equipped with turbocharger and intercooler