3 replies to this topic

[augusto]

We intend to control the capacity of a Reciprocating Compressor by modifying the rpm of the Gas Engine that is moving the Compressor. Does anyone know or has experience about the maximum variation range of speed of one Internal Combustion Gas Engine?

Many Thanks

 

Augusto

[Erwin APRIANDI]

Hi augusto,

 

It will be depend on the speed range that the gas engine can give, there are so many type of gas engine in the industry and you failed to give us data on the gas engine that you are questioned here.

[augusto]

Many thanks Erwin,

 

For a better comprehension I will reformulate the question: According to many Reciprocating Gas Engine Manufacturers; i.e. Waukesha, Caterpillar, Wartsila, etc. the Power Rating is normally shown at two rpm and from this information I might conclude that the "Speed Turndown" is no more than 25 %. Is that so or would be possible to have values above 25%?

 

Best Regards

 

Augusto SAVIO

Edited by augusto, 21 May 2014 - 09:46 AM.

[Erwin APRIANDI]

Hi augusto,

 

As a basis, engine or gas engine is similar to the engine that is available in the car that provide the power to driven it. So similar to car which can operate from 0 to max speed, the gas engine driver for reciprocating compressor can also do the same.

Based on this, there is no limitation on the minimum rotation on the speed of engine, but there will be limitation on the max rotation on the engine driver based on the available power.

 

However this is based on the driver, the reciprocating compressor it self will have it own range of mechanically safe, based on the design condition (pressure and temperature) of the compressor.

 

Furthermore, the range of engine speed will also determine by the range of speed control system. 

 

The curve on the engine power rating normally based on the RPM where it gives the best efficiency or likely to operate

(mechanical people to correct me if i'm wrong).

 

Same like a centrifugal compressor curve where the vendor will not gives a curve from 0 rpm to the max rpm with increament of 100 rpm each, but normally they will gives curve on the rpm where you are likely to operate.

Edited by Erwin APRIANDI, 27 May 2014 - 02:03 AM.