The world’s largest diesel engine - double acting two stroke engine
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- Опубліковано 20 лют 2016
- The world’s largest diesel engine; double-acting two-stroke engine is 24.5m long, 12.5m tall and it weights 1.400 tonnes and its located in Copenhagen.
The diesel engine generates 15MW which corresponds to 22.500 effective horsepower. A special feature of the engine is that it is a double-acting two-stroke engine. This means that ignition takes place both when the piston is in its top position and when it is in its bottom position - a technology which is no longer in use.
The engine works on diesel oil with a calorific value of approx. 10,000 kcal/kg. The diesel oil is injected into the cylinders with a pressure of approx. 350-400 bar. The fuel oil consumption is approx. 240 g per kWh at 12.000 kW. The scavenge air comes from four blowers, powered by the engine via a gear, with an output of approx. 1.800 m3 air per minute at a pressure of 0.25 bar. The exhaust gas temperature is 300 degrees at 12.000 kW. The bearings are pressure lubricated at a pressure of 2.5 bar. The 40 tons content of the lubricating oil tank is injected through the bearings as lubricating oil and through the pistons as cooling oil approx. 10 times an hour.
The engine is freshwater cooled in a closed system which is cooled by water from the Copenhagen harbor. It is 24.5 m long, 12.5 m tall and weighs 1,400 tons. From this, the weight of 1 complete cylinder constitutes 20 tons, the weight of one opposed piston with 10 piston rings constitutes 4.5 tons, the weight of the 730 mm thick crankshaft constitutes 140 tons and the weight of the turning wheel 80 tons.
Source: www.dieselhouse.dk/en/h-c-orst... - Розваги
ces moteurs m'ont bercé depuis mon enfance...au son encore enfoui dans ma mémoire, les souvenirs du bien-être marin reviennent...
what kind of diesel fuel
What does this engine power?
Damn. It is big, double acting and two stroke. Everything a diesel should be! It may be the biggest, but it is not the most powerful. That belongs to an engine which powers the largest container ships, like the Emma Maersk. It generates about 4x the horsepower this mammoth does.
There are for sure bigger engines than on Emma Maersk.
Not diesels but steam turbines powered by nuclear reactors or otther fuels( could be diesel fuel too).
@@mihaiilie8808 Of course
@@theq4602 another thing i like about steam turbines its that they are double as efficient than diesels.
If Emma Maersk had a steam turbine engine it would have consumed half the fuel for the same power output than the diesel engine it has.
There were made ships with steam turbines in the past but nowadays only nuclear submarines have steam turbines as propulsors.
@@mihaiilie8808 What are your sources for this? Diesels regularly achieve 40+% fuel efficiency. Some can even push it to 50% Steam turbine engines are not as efficient. This is due to the large amounts of heat escaping from the steam pipes and the boiler before that heat is converted into mechanical energy at the turbine. Nuclear powered cargo ships is something I long for. Must less pollution. But I would not say a steam turbine can be twice as efficient as a diesel engine. Most steam turbines are about 30% efficient.
You should take a look at Brayton cycle turbines. They can be extremely efficient and compact.
@@theq4602 Carnot efficiency says that new diesels are 20% efficient( i think can go up to 25%) ,gasoline engines are at maximum 15% efficient( not 2 strokes but diesel 2 strokes are more efficient) and modern steam turbines are 40 % efficient but there is the possibility to achieve the highest efficiency ,60%.
The fuel for a steam turbine doesnt have to be nuclear and in fact non nuclear fuels are better because they achieve higher temperatures of steam than nuclear.
The modern steam turbines recycle the condensed hot water as it is a cloosed loop.They reheat the water that its warm .
Because of the high efficiency of the steam turbines they are used to power generators and produce electricity .
When diesel engines are used to drive generators ,the cost of electricity would be double than if was produced by a steam turbine.
I was engineer on 6 leg Doxford engines, this one looks like a toy compared,
Doxfords were single action engines. How come they were more complicated? This one is a “exhausting engine crew” champion
Double acting???
Or opposed piston???
Double acting
@@mollachouse That is an opposed piston engine not a double acting!!!!!
both
@@johnhili8664 as an ex marine engineer, i will reply this BW engine is double acting : it has two sets of fuel injectors, one set above the main piston, one set under.
there is no fixed cylinder heads, cylinder heads (top and bottom) are piston moving opposite ways from the lain piston.
So, three pistons in each cylinder.
The main piston moves the whole thing through rod and crankdhaft.
Upper and lower pistons are mived from an excentric.
@@jean-claudedemartin3810 Ok thanks for the information, I have worked on Doxford engines when I was an engine fitter in a ship yard but never worked on B&W engines!!!!!!
This isn't even close to being the world's largest engine. Wartsila RTA-Flex 96C, 2300 tons, 107,000 hp at 90 rpm.
Why is the double acting technology not in use now? Please reply.
it is n used, actually this doesn't work anymore. Its been only used for demonstration :)
in comertial aplications efficiency and endurance its more important than power, and two stroke are less efficient and less endurable than four strokes.
@@santiagoperez2094 on naval applications most of the time the opposite is true the huge two strokes that run the container vessels are vastly more reliable than the 4 stroke counter parts. Most of these double action engines were used in ships and it boiled down to maintenance was alot more intensive and if a break down occured was also alot more intensive. normal 2 strokes got to the same effiencency as these fairly quickly anyway now. courtosy of a 3rd engineering officer
@@santiagoperez2094 This is a diesel 2 stroke and its double as efficient than a 4 stroke gasoline.
This is an opposed-piston, two-stroke engine, and is not double-acting. There are measurable advantages of thermal efficiency in opposed-piston engines, but this is offset by issues of mechanical complexity, which makes them expensive to manufacture and maintain.
This specific engine was used to generate electricity for an entire city, somewhere in Europe (I can't remember which one). During WWll, they hid arms and valuables inside of it, so the Nazis wouldn't find them. I'd like to see the generator that it powered.
Lets fit this in a 2024 arctic cat catalyst!
Don't recognise this particular engine, but it looks like a doxford opposed piston style, and definitely not double-acting. Also nowhere even close to the biggest engine either in horsepower or physical dimensions. go and look at engines by Sulzer, Mitsubishi, Burmeister and Wein, Wartsila usw. Speaking as someone who has sailed with engines from all of those manufacturers...
It's a Danish B&W Engine and indeed double acting. The Yokes (or however you call these Things) on Top may make it look like an Opposed Piston Engine; I myself thought that at first. If you look closely, you can find similar Yokes below the Pistons. They move the Piston Sliders which act as Exhaust Valves. Scavenge Air is admitted in the Middle of the Cylinders through Ports in the Cylinder Liner which are opened and closed by the Main Piston (just like in almost any Two Stroke Engine), and the Exhaust Gas leaves through similar Ports at the Ends of the Cylinder Liner, creating an Uniflow Scavenging System. The Piston Sliders there have a much shorter "Stroke" than the Main Piston as they don't do any work and only open and close the Exhaust Ports.
This is not the largest diesel engine.
I really want to believe you but you have to prove it 😏
Their own website states the record was broken in the 1960s.
it was
@@mollachouse Winterthur Gas and Diesel (back then known as Wärtsilä-Sulzer and Development started when it was just Sulzer) built the 14RT-Flex 96C Engine which is fitted to the Emma Maersk Class Container Ships. It is commonly regarded as the largest Diesel Engine ever made, with 960 mm Bore, 2500 mm Stroke and a Maximum Continuous Rating of over 84,000 kW at 102 RPM for said 14 Cylinder Version. The M.A.N. K98-Series is even larger at 980 mm Bore and 2660 mm Stroke and 5720 kW per Cylinder (same as the WinGD 14RT-Flex 96C) at 94 RPM, although I'm not sure if it has ever been built with 14 Cylinders. The slower Speed also allows to fit larger Propellers, which are more Efficient. The largest Diesel Engine in the World would be an M.A.N. 14K108, which is essentially the same as a 14K98 but upscaled to a Bore of 1080 mm. No K108 Engine has ever been built though, not even the smallest Version 6K98 with six Cylinders.
God spared me from that monster. Real Dark Genius had invented double acting engines. No wonder they extinct as dinos. B&W made tem all dead. Including more simple and newer such as MAN and Sulzer
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