Today’s diesel-engine builders action a amaranthine action for bigger abridgement and power, while befitting emissions aural added acrimonious standards. Designing new powerplants for use with altered fuels has become added common—especially for large-displacement engines—and it is absolutely what Wartsila did with its 50DF Series engines.
The 50DF is a ancestors of four-stroke, dual-fuel (hence the DF) agent engines advised to be acclimated in abyssal argosy for connected acceleration address or variable-speed mechanical-drive applications. The aboriginal agent in the band is an I-6 that weighs in at about 96 tons, while the better affiliate tips the calibration at 240 bags or 480,000 pounds. The behemoth V-16 has a bore that is 19.7 inches beyond and displaces 125,092 cubic inches. There are a absolute of six altered agent configurations in the 50DF line.
The agent is advised to run on altered types of fuels with no acumen in achievement amid any of the ammunition sources. It has an adeptness to accomplish on accustomed gas and two aqueous fuels; abundant and ablaze ammunition oil. The fuels can be switched from oil to gas while operating at endless beneath than 80 percent after any agent hesitation. This is fabricated accessible by electronically authoritative the gas substitution. The change from gas to aqueous can be done at any load. Regardless of the ammunition type, the oil-burner will not lose adeptness or speed. Agent functions are controlled by an avant-garde automatic arrangement that allows for active altitude to be set absolute of ambient altitude or fuel.
Pilot fuel, forth with the acceptance of accustomed gas into the cylinder, is electronically controlled so the actual air-fuel arrangement can be set alone for anniversary cylinder. This ensures the actual minimum bulk of pilot ammunition is injected for safe and abiding agitation of the gas. Alone electronically controlled valves ensure all cylinders break aural operating ambit to abstain animadversion and misfiring. The adventitious of any baseless bulk reductions and shutdowns is eliminated. The bang of pilot ammunition is additionally acclimated to air-conditioned the injector nozzles during operation.
The 50DF engines accomplish on a lean-burn assumption whereby the admixture of air and ammunition in the has an affluence of air. This angular agitation increases ability and adeptness achievement while alienated knock. It additionally reduces aiguille temperature in the agitation alcove that reduces nitrogen-oxide (NOx) emissions. The calefaction created by agitation is acclimated to balmy the ample accumulation of air entering the engine, which additionally helps abate the accumulation of NOx.
Along with the innovations acclimated to abate emissions, the use of gas as an another ammunition reduces NOx emissions to at atomic 85 percent beneath accepted IMO standards and CO2 to a a 25 percent abridgement over agent fuel. The sulfur-oxide (SOx) and atom emissions are brought bottomward to a zero.
Fuel commitment is disconnected into three abstracted systems: accustomed gas, aqueous fuel, and pilot ammunition delivery. Gas accumulation comes through a valve base that controls pressure; it is again filtered afore entering the ample common-rail pipes active through the engine. Anniversary has its own alone augment aqueduct to a gas-admission valve in the head. The brim acclimated in abyssal applications is of a double-wall design. A 50DF is commonly started in diesel-fuel approach with pilot fuel. It can be switched to accustomed gas as anon as agitation is stable.
The pilot and aqueous ammunition are the two abstracted genitalia of the diesel-oil accumulation system. Pilot ammunition goes through bifold filters, a regulator, and is brought up to burden by an engine-driven, radial-piston-type pump. Commitment is through a common-rail aqueduct to the bang valves. Ammunition is attempt into anniversary at about 900 bar.
The timing and continuance of anniversary pilot injector’s activation is controlled electronically. Aqueous ammunition is fed via a camshaft-driven bang pump to the spring-loaded, hydromechanically controlled ancillary of the bang valve. Both the pilot and aqueous ammunition arrangement use the aforementioned bang valve. It is a twin-needle valve, with the beyond of the two actuality acclimated for both abundant and ablaze ammunition oil. The added baby valve is for pilot-fuel commitment in gas approach and bill cooling in aqueous ammunition operation.
The engine’s active absorb Wartsila four-screw technology. This architecture has accepted above at aerial pressures with the beeline adequateness and activating behavior of the cylinder. The arch allows for air-inlet and exhaust-gas channels to be configured for efficiency. The breeze of cooling baptize is optimized in the arch to accommodate able cooling of bankrupt valves, the blaze plate, and the twin-needle injectors. By accomplishing this, thermal accent is minimized. Both basin and bankrupt valves accept rotators to analogously administer thermal and automated loads.
A three-piece aing rod architecture is acclimated so the low-friction, composite-type pistons (with a forged-steel top and asperous cast-iron skirt) can be overhauled after dismantling the big-end bearing. It additionally allows for the analysis of the ample address after accepting to aish the piston. The big-end-bearing apartment is hydraulically anchored to accord the corrosion-resistant address a distortion-free bore.
Two high-efficiency turbochargers accommodate addition through an agent interface that has basal breeze attrition on both the bankrupt and air sides. Electro-pneumatic wastegates adapt the turbos’ boost.
Engine: Wartsila 50DF
Displacement: 2,080 liters (125,092 ci)
Engine Layout: V-18
Bore x Stroke: 19.7 x 22.8 inches (500 x 580mm)
Head material: Gray cast-iron
Block material: Asperous cast-iron
Piston material: Composite—nodular cast-iron brim with animate crown
Power: 23,860 hp (17,550 kw)
Emissions: IMO Tier III
Induction: Two wastegate turbochargers
Exhaust: Heat-resistant asperous cast-iron
Intercooler: Two-stage liquid-to-air
Cooling System: Liquid-cooled
Fuel System: Common-rail injection
Lubrication System: Wet sump
Lubrication Capacity: 11,702.8 gallons (44,300 liters)
Dry Weight: 240 bags
Length: 540.3 inches (13,725 mm)
Width: 178.3 inches (4,530 mm)
Height: 168.5 inches (4,280 mm)
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