Internal Combustion Engine
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Posted by: matin ® 06/05/2004, 04:49:13 Author Profile Mail author Edit

I have in my factory ABC Dual fuel turbo charged engine 6 piston inline arrangement.Its a 1MW engine used for power generation.Its pilot injection is Diesel fuel and the second fuel is natural gas.When the engine runs on diesel fuel say at 800KW its temperatures are around say for eg 450C (average on engine panel) when we switch it to dual fuel its temperature goes upto 520 C at the same load.When it switched to dual fuel mode its diesel actuator starts decreasing the amount of diesel being injected and simultaneously opening the gas actuator.Why does the temperature goes up when at dual fuel operation. Secondly the injector pumps are set at 245bar but the maximum combustion pressure is around 60bar why is the injector set at that much high pressure. What is the advantage turbo washing on the engine performance only the compressor side.

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Re: Internal Combustion Engine
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Posted by: matin ® 06/08/2004, 03:32:28 Author Profile Mail author Edit

The natural gas has a better octane number(96) and although it mixes with the intake air much better and burns more efficiently then why does the gas engine are poor in taking care of torque loads.I have in my facility two Guascors 2*725KW V-16 turbo charged there RPM goes down too much when I put a torque load of around 80--100KW on them but the same I do with the diesel engines there response is very good.why is that.Has it got to do with the calorific value? Secondly when here in Pakistan when we convert our cars to CNG we feel a loss of power while driving on CNG as compared driving on Petrol.

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Re: Internal Combustion Engine
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Posted by: bruce38100 ® 06/07/2004, 03:54:49 Author Profile Mail author Edit

The first question gas has a higher octaine rating and being a gas it mixes with the air itake better and burns at a higher temperature.

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Internal Combustion Engine
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Posted by: RandyKimball ® 06/05/2004, 15:01:51 Author Profile Mail author Edit

I'll grab the second part of the question. The injectors of a diesel pop at a high pressure because it is able to force the fuel through smaller holes and cause a better atomization (vaporization) which improves burn rate and percentage complete burn at igition at heat of compression. The worst suggestion of you lifetime may be the catalyst to the grandest idea of the century, never let suggestions go unsaid nor fail to listen to them.

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