High Molecular Weight Fuel Gas in Gas Turbine Generator

[JayEhVee]

I have a high mwt. fuel gas, which has a very high proportion of LPGs. This fuel gas is 60mol% C1, around 16% C2, 12% C3 and 5% C4. Mwt is 25.1. LHV is around 50MJ/m3 and it has a high Modified Wobbe Index.

My question is, is this fuel suitable for an aeroderivative gas turbine?

I have seen GTs which can operate in dual fuel mode, i.e., either a natural gas or an LPG, but my fuel gas stream is really a very rich gas, a combination of "natural gas" plus a significant fraction of LPGs.

I can't find much specifically about this online. any help much appreciated!!

 

[LittleInch]

You're going to need to ask each of the vendors in turn via technical sales.

That's a pretty rich gas so maybe not.

Solar turbines are usually good to respond and often accept "off spec" gas, i.e. not the gas you get from the sales gas line. I've used "raw" gas in Solar turbine before now and it works, but might be de-rated a bit from its nominal power and they are Open cycle so efficiency is ~30% or less.

Just make up a compositional table and properties such as Wobbe index, HHV etc and send it to them and ask the question. You won't find this on the web as it's not standard spec natural gas.

I also tried to use high MW gas in a gas engine, but most of those really don't like it.

Is this temporary or permanent use?
Power rating?

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[JayEhVee]

LittleInch, thanks for the response.

This will be permanent use for elimination of flaring to generate power. Around 10MMSCFD so I'm estimating around 40-50MW power potential.

 

[LittleInch]

That's a sizeable demand.

Most "dual fuel" turbines are either natural gas or Kerosene. I don't think I've seen one which runs on Propane or Butane.

Happy hunting and when you find one please come back and let us know...

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.