Natural Gas Condensate

[MexTijuana]

Hello together,

a gas turbine is operating with natural gas. The dew point of the gas is 35°C. The supply pressure 30 bar and the mass flow 7 kg/s. In case the natural gas temperature is below the dew Point, e.g. 30°C condensate should occur.

Is it possible to calculate the amount of condensate within 1 Operation hour.

Thanks for your help!

 

[zdas04]

The dew point is 35 C at 30 bar? That is a lot of pressure what is your condensible hydrocarbon?

David Simpson, PE
MuleShoe Engineering

"Belief" is the acceptance of an hypotheses in the absence of data.
"Prejudice" is having an opinion not supported by the preponderance of the data.
"Knowledge" is only found through the accumulation and analysis of data.
The plural of anecdote is not "data"

 

[MexTijuana]

The natural gas has about 0.34 mol% Heptane+.

 

[BigInch]

As natural gas has no hydrocarbon condensates, I think you mean the amount of condensing .... water.

See page 8

http://www.sintef.no/project/Trondh...ater content of high pressure natural gas.pdf

Independent events are seldomly independent.

 

[zdas04]

BigInch,
The term "Natural Gas" is very context dependent. Commodity "Natural Gas" has no condensible hydrocarbons while wellhead "Natural Gas" can have significant natural gas. With 0.34% C7+, this ain't commodity gas.

It is possible, but incredibly complex to predict the liquid fall out. You need to use something like Hysys, or ProSim with a detailed analysis (typified C7+ won't generally work, you need an extended analysis). For less than $20k worth of software your options are very limited. You just can't successfully do the MANY iterations required by hand.

David Simpson, PE
MuleShoe Engineering

"Belief" is the acceptance of an hypotheses in the absence of data.
"Prejudice" is having an opinion not supported by the preponderance of the data.
"Knowledge" is only found through the accumulation and analysis of data.
The plural of anecdote is not "data"

 

[LittleInch]

Dew point at what pressure?? If it's lower than 30 bar you may be getting drop out even at or above the dew point dpeeigin on your composition, but this indicates to me that it's pretty raw looking gas.

Can you calcualte it - yes, but as zdas04 says very eloquently, you need a decent computer simualtion package (HYSYS etc) to work it out.

I would stick in a pre-heater if I was you - I've had to do that on many fuel gas systems to get the gas above the water and condensate dewpooint. If there's one easy way to wreck a rather expensive GT it's putting liquids in it that it doesn't expect....

My motto: Learn something new every day

Also: There's usually a good reason why everyone does it that way

 

[BigInch]

Yes I think that I have heard once or twice that there are many flavors of natural gas. I was telling the OP that one of them is no condensates, so that he would properly describe his stream.

Independent events are seldomly independent.

 

[zdas04]

Too subtle for me apparently. Sorry.

David Simpson, PE
MuleShoe Engineering

"Belief" is the acceptance of an hypotheses in the absence of data.
"Prejudice" is having an opinion not supported by the preponderance of the data.
"Knowledge" is only found through the accumulation and analysis of data.
The plural of anecdote is not "data"

 

[BigInch]

No argument from me. "Natural gas" means everything and nothing.
I have always assumed CH4 + water in the absence of a stream analysis.
Anyway, and fortunately, you asked him directly.

Independent events are seldomly independent.