Mixing of LPG with natural gas
Mixing of LPG with natural gas
(OP)
I have a situation where we need to mix 20,000 bbl/d of LPG with 200 mmscfd of gas upstream of a compressor. The 6" LPG connection seems to be able to only "dump" the liquid into the gas line, leaving me with concerns about reaching steady state. HYSYS says that thermodynamically it will work. Any ideas on how to ensure it will?





RE: Mixing of LPG with natural gas
Maybe super heating the liquid under increased pressure and then use some sort of (packed) tower with a bottom stream going back to the LPG distillation tower?
Best regards
Morten
RE: Mixing of LPG with natural gas
Personally, I have always found mixing to be a tough thing to predict well so I always go to an expert. In this case you also have to deal with evaporation which makes it even more complicated.
Things I would look closely at: time to get from injection point to compressor, distance from injection point to compressor, routing of pipe (ie elbows, etc.), temperatures (and how stable they are).
Another area to look closely at is control. Is 20,000 bbl/d an average number? Does this fluctuate a lot (short bursts of high flow)? If so, you will probably have problems.
Besides nozzles, you might have some luck with others things to atomize the liquids (or at least get some small drops or films) and get good quick mixing). Static mixers or some sort of other piping internals may help.
RE: Mixing of LPG with natural gas
RE: Mixing of LPG with natural gas
http://www.komax.com/det-gasliquidcontacting.html
RE: Mixing of LPG with natural gas
If you had a lean gas and compres it to dense phase, and a liquid LPG stream, pump it to the same pressure, mix the two streams (assuming that the combined fluid remains in the dense phase - what would then happen? Would the two fluids just mix and for a uniform dense phase or what? Anybody know of experiments performed and perhaps observed visually?
Just curious.
Best regards
Morten
RE: Mixing of LPG with natural gas
One time we did this, we had to stop flareing for 4 hours. When we continued, the flare went out way sooner than it should. We set up the GC and watched the stream. It took about twice the volume to get the ethylene out becasue the nitrogen floated under the ethylene and stayed two phase.
You will need a mixer or have something get them to mix. but being supercritical is not any different.
RE: Mixing of LPG with natural gas
Best regards
Morten