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 DUAL FUEL:-dual fuel consist either heavy fuel, Marine diesel or LNG gas which is mostly methane or ethane.  Dual fuel ...
WORKING PRINCIPLE:- there are many modern developed dual fuel engine such as MAN B&W 51/60,WARTSILA 50df,WARTSILA 32df etc...
WORKING:- FIRST STAGE Engine starting is always in diesel mode. automatically changes from fuel oil to gas operation at ...
SECOND STAGE The gas admission valve is closed and the piston moves up the cylinder compressing the gas/air mixture
THIRD STAGE  At just before TDC a pilot injector injects a small amount of fuel oil into the cylinder which starts to bur...
FOURTH STAGE The piston is forced down the cylinder by burning & expanding gas.
FIFTH STAGE The exhaust valve opens followed by the scavenge ports. Air enters the cylinder pushing out the exhaust gas. ...
THERMAL EFFICIENCY
COMPARISON OF FUEL S.NO. PROPERTIES HEAVY FUEL OIL DIESEL GAS 01 CALORIFIC VALUE(KJ/KG) 42500 48500 55500 02 FLASH POINT(‘...
HFO EFFECT ON ENVIRONMENT
GRAPHICAL ANALYSIS
COMPARISON OF EMISSION S. NO. EMISSION HEAVY FUEL GAS 01 NOx 100% 10%-15% 02 COx 100% 80% 03 SOx 100% ELIMINATED 04 SOOT/A...
DUAL FUEL Advantages • Reduce NOx, SOx,COx emission • Low cost operation • Long engine life • Low maintenance • Corrosion ...
FUTURE • HFO crisis in 2050. • Future HFO hard to adopt IMO regulation(Annex6 tier 3). • 1 JAN ,2020 IMO required Sulpher ...
ANY QUERY???
2 stroke marine duel fuel engine (by dwivedi)
2 stroke marine duel fuel engine (by dwivedi)
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2 stroke marine duel fuel engine (by dwivedi)

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regarding paper explains about uses and management of boil of gases in LNG carriers. it mainly focused on latest duel fuel technology to avoid wastage of LNG boil of gases.

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2 stroke marine duel fuel engine (by dwivedi)

  1. 1.  DUAL FUEL:-dual fuel consist either heavy fuel, Marine diesel or LNG gas which is mostly methane or ethane.  Dual fuel engine is the modern developed engine used for marine propulsion which is suitable for heavy fuel oil, marine diesel as well as LNG gases.
  2. 2. WORKING PRINCIPLE:- there are many modern developed dual fuel engine such as MAN B&W 51/60,WARTSILA 50df,WARTSILA 32df etc. The cylinder cover is slightly changed for DF engine to accommodate the gas valve and gas handling block as well as pilot injection valve.
  3. 3. WORKING:- FIRST STAGE Engine starting is always in diesel mode. automatically changes from fuel oil to gas operation at load below 80% of full load.  The exhaust valve is closed and the gas admission valve is open, Gas at a higher pressure than cylinder pressure flows into the cylinder.
  4. 4. SECOND STAGE The gas admission valve is closed and the piston moves up the cylinder compressing the gas/air mixture
  5. 5. THIRD STAGE  At just before TDC a pilot injector injects a small amount of fuel oil into the cylinder which starts to burn and ignites the gas/air mixture.
  6. 6. FOURTH STAGE The piston is forced down the cylinder by burning & expanding gas.
  7. 7. FIFTH STAGE The exhaust valve opens followed by the scavenge ports. Air enters the cylinder pushing out the exhaust gas. In the event of gas supply interruption the engine transfers from gas to fuel oil
  8. 8. THERMAL EFFICIENCY
  9. 9. COMPARISON OF FUEL S.NO. PROPERTIES HEAVY FUEL OIL DIESEL GAS 01 CALORIFIC VALUE(KJ/KG) 42500 48500 55500 02 FLASH POINT(‘C) 65 60 65-68 03 SG 0.9-0.99 0.85 0.82-0.85 04 H.C.RATIO 1.5:1 2.5:1 4:1(METHANE)
  10. 10. HFO EFFECT ON ENVIRONMENT
  11. 11. GRAPHICAL ANALYSIS
  12. 12. COMPARISON OF EMISSION S. NO. EMISSION HEAVY FUEL GAS 01 NOx 100% 10%-15% 02 COx 100% 80% 03 SOx 100% ELIMINATED 04 SOOT/ASH 100% 1%-2%
  13. 13. DUAL FUEL Advantages • Reduce NOx, SOx,COx emission • Low cost operation • Long engine life • Low maintenance • Corrosion free • High power weight ratio Disadvantages • Tendency of vapor lock while using light fuel. • More Chance of leakage. • Dissipate if rupture occurs.  storage and handling of fuel
  14. 14. FUTURE • HFO crisis in 2050. • Future HFO hard to adopt IMO regulation(Annex6 tier 3). • 1 JAN ,2020 IMO required Sulpher to 0.1% . • Future HFO will be more worst. • Synchronizing with future IMO regulation. • Non toxic ,no contamination • many problem ,one solution
  15. 15. ANY QUERY???

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