MIXING STEAM AND AIR

[roker]

Hello,

What is the best way (simple and low cost) for mixing steam and air low flow streams (about 25 kg/hr)?

regards,
roker

 

[TD2K]

Crack open a valve on a steam line.

If you give us some more details what you are trying to do, what the system looks like, you'll get more useful suggestions.

 

[roker]

Thanks TD2K,

We intend to mix 25 kg/hr 14 barg steam at 250 C with 25 kg/hr 6 barg air at 25 C, the mixture will be routed to a furnace.

Hope these data clarifies the issue.

regards,
roker

 

[sshep]

Hey roker,

The easiest way to mix them is just a tee and let the piping mix the streams. It sounds like pretty small stuff.

Most of the cost will be the instrumentation (control valves, flows, cabling, etc). Not sure of your control objective or how important the ratio is, Maybe all you need is a restriction orifice.

more info=better answer. You know this.

Best wishes,
sshep

 

[TD2K]

These can't be very large lines even for air at that flow and pressure, are you using tubing? How critical is it to get good mixing? I was originally thinking of using a drilled pipe to add the steam to the flowing air stream but perhaps just a tee combining the steam and the air.

 

[Latexman]

What is the distance from mixing point to furnace? What size line/tubing?

Good luck,
Latexman

 

[roker]

Thanks all,

We will use 1 inch pipes and the length after the mixing to the furnace is about 2 meters.

Should the tee be a special one? since it is a pilot the ratio is important.

Will an ejector be "overkill" ?

Regards,
roker

 

[Latexman]

Your L/D ~ 80. All my references suggest L/D > 10 for "complete mixing". Probably more like 95% mixing. I'd say you are good with just the pipe as long as the flow is very turbulent.

Good luck,
Latexman