Hey Kujah,
My comment about the pressure drop was only because you specified the water pressure to be 200kpad above the pipe pressure. I envisioned this supply to be from a header and since you had a flowrate in mind, then it seemed logical you would have some sort of control- a typical on the cheap installation might be nonreturn valve, a hand control valve, rotometer, and injection device. If you have an injection pump to control capacity then my vision may not apply.
You are dispersing water droplets into vapor for cleaning purposes. The water you put in will have to come out somewhere (i.e. drawn off in your boot) and so the goal seems to be to get the best wash you can with a small amount of water. This means we want to get small enough water droplets to be entrained to all the fouled surfaces.
The energy for dispersing the water can come from the 200kpad available (i.e. a spray device at tip), or from the vapor stream. Although my experience is that many injection points are not commercial designs, the applications are too numberous for such equipment not to exist. A quick internet check for chemical injection quills will turn-up many sites. I found this site for a device which allows connection of quills, open tip, nozzles, and strainer/heads. Their quill design terminates with a 45deg cut, and a slot:
Other designs are flat tips or rely on only on the normal 45deg bevel:
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In all these designs the dispersion from a quill tip uses energy from the vapor stream via turbulance at the tip. 15ft/sec is described as excellent. No quantitative guidence is given for quill inside diameter, but as the liquid is dispersed by flowing into turbulance at the tip, we expect a low exit velocity to be fine.
If you have a quill design as described above with a high velocity vapor, then I continue to think you can probably use your existing system as is- i.e. replacing will likely result in little improvement. Have you calculated the velocity at the point of injection yet? If your velocity is low, some sort of spray tip may be required.
Best of luck, sshep
also search quill keword in threads:
thread301-75398, thread135-90634; thread378-9202