Flue Gas Compression - Need Impurities

[Danangeles]

Hello everyone,

I am a new engineer and I have a question I find quite challenging. I am working on a project in which we need to compress flue gas into cylinders from one of our plants to a research facility approximately 300 miles away. We are conducting research on the scrubbing potential of a certain mixture and would like to simulate the flue gas' original composition as closely as possible. The composition is approximately as follows:

H2O: 4.5%
O2: 15.5%
CO2: 3%
N2: 77%
Trace amounts of NOx, SOx, CO, assorted HC

The flue exits the stack at around 450 F. If we were to chill it to 100 F and then compress it to 1500 PSI, would all of the impurities and CO2 drop out? For this project, I am looking to keep as many of the impurities as possible. I imagine I would have to compress it to a lower pressure to keep them from dropping out.

Thanks,
Dan

 

[LittleInch]

Your issue I would imagine is that as you cool the gas and the water condenses, different amounts of the gases will dissolve into the water. So you need to keep every thing together so that in the remote facility then can heat it all up and get back to the original composition. If you have a good analyser you can then check to see that your samples capture all of the gases.

My motto: Learn something new every day

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

 

[dcasto]

Spoiler alert, I added just .01% methane for grins. This is the composition going into your cylinder after 4 stages of compression with intercooling and separation.

Why not just make your own sample of the stuff in the lab, why compress and ship it?

TOTAL VAPOR INCIP L1 LIQUID 2 TOTAL
ID COMPONENT NAME LBMOL/HR LBMOL/HR MOL FRA LBMOL/HR MOLE % KVALUE
---- ---------------- --------- --------- --------- --------- --------- ---------
2 METHANE 0.009999 0.009999 .1594E-06 .3854E-07 0.010423 655.429
47 OXYGEN 15.4984 15.4983 0.000201 .4868E-04 16.1551 804.236
48 CARBON MONOXIDE 0. 0. 0. 0. 0. 7.96209
49 CARBON DIOXIDE 2.99913 2.99889 0.000999 0.000241 3.12622 31.3723
46 NITROGEN 76.9919 76.9918 0.000750 0.000181 80.2546 1072.31
62 WATER 0.435196 0.193916 0.998051 0.241280 0.453638 0.002030
---- ---------------- --------- --------- --------- --------- ---------
TOTAL 95.9346 95.6929 1.00000 0.241751 100.000