Noise Pollution Reduction of Steam Injection

What I understand what you are saying here, one has to address the origin of the problem at hand.

The noise from the steam injection is the steam traveling at/near the speed of sound. What you have to do is to slow and disperse this speed without impinging on the flow rate..

It's your equipment and you don't know?

"what is the optimal orientation of this pipe"?

You tell us, "what is the optimal orientation of this pipe" after you try some different variations.

Decreasing steam speed..hmm good idea I can install a titanium baffle/impingement plate arrangement.

As for the orientation we keep the holes pointing upwards, however common sense says that sideways arrangement (holes pointing to the sides of the tank) will also disperse steam(heat) radially

decreasing the speed, but keeping the flow constant, with an impingement plate, the energy is still there.

Normally what is done is with a form of an expansion chamber on the ejector (increased cross section area). the best I know of is that this will only reduce the noise.

The problem you are having is typical. if it could have been solved it would be. Its still is an issue.

A while back we did some experiments to reduce this where it improved it... nominally.

There may have been a post here on CR4 about this in the past. Try searching this site.

good luck

Thanks for the valuable post but can you recommend anything about its orientation. Also why the end blind of this distributor keeps breaking.

Your idea of increasing cross sectional area will decrease incoming steam speed, well thats what Bernouli says however if the dia of distributor is doubled similar effect can be achieved.

may be you should make the holes that can perform balance pressure and injection to reduce the noise pollution of the steam injection. (better you use mechanical drawing's principle)

Replace new one, or fabricate another similar design with original though diffrent material close property to titanium. That is the design, don't play with injector velocity, you'll affect the vacuum effect. Do some Bernoullis equation and reflect on the design parameter. Does the original design noisy? If not, replacing it with new original design will eliminate the noise. Other than this, good luck with your production and raw materials you'll sacrifice a loss for such modification. What are the tangible odds eliminating the noise? What are the tangible odds effecting vacuum on the process. These are the questions before doing modification, your credentials included.

That is the design, don't play with injector velocity, you'll affect the vacuum effect.

I doubt that decreasing speed at distributor pipe & way after ejector outlet will have any adverse affect on vacuum upstream, am not decreasing inlet steam to ejector neither playing with its outlet bore...

Then what's the main purpose of distributor pipe?

Sir its main purpose is heat recovery from ejector outlet, & the perforations for heat distribution to a liquid containing tank as shown in pic, thats why the distributor pipe enters from below the tank.

As I explained high temperature accelerates chlorate decompositions or oxidation to chlorine

If you are actually injecting the steam into a solution in a tank, then to quiet this from having cavitation bumps, you will need to improve solution movement around the steam nozzle(s). It is recommended to have only a few steam nozzles of sufficient diameter to meet flow conditions, but include around these a venturi in the solution that starts off at large diameter (straight for at least one diameter of this large diameter), but which cones down to a concentric annular opening around the steam nozzle, with a short straight section (against of at least one pipe diameter). This results in changes in pressure near the steam nozzle that induce extra solution flow around the nozzle, and result in a much quieter admission of steam to the solution.

You need to search the web for the supplier of these, no need to fabricate this yourself. If you cannot buy them in Pakistan, I don't know what else to tell you.

Sir are you suggesting something like this

I mean I have to make it horizontal (instead of vertical), Stream A will be ejector effluent at the inlet of my tank from below, Stream C will be the solution drawn in it (which you refer), E section would be omitted & there can be holes in the D section...

No matter what type of Venturi you use, it will nominally help but the velocity of the outlet still will be traveling high, the noise level will remain.

check out some of the newer devices. If the mixing is under a pretty stiff velocity, and is intimately making contact with water and steam (as is it desired to), then the chattering, simmering, etc. noise is greatly reduced.

Nope. What I was referring to is a steam jet arranged horizontal in a tank of water, with an outer shroud that is 15cm diameter cylinder for about 20 cm, then cones down to a diameter about 3-5 cm which is about 1-2 cm larger than the diameter of the steam jet. All of this is under water in an open vessel being heated, but this really moves the water around providing mixing, and cuts down on bumping, boiling, and water hammer. Noise is sufficiently low for practical purposes. Kind of hard to draw picture on here. Will see what I can find.

More like this:

http://www.spiraxsarco.com/Documents/Steam_injectors-Sales_Brochure.pdf

or this:

http://www.tappi.org/Bookstore/Technical-Papers/Journal-Articles/Archive/Solutions/Archives/2003/November/Heating-of-viscous-slurries-with-direct-steam-injection-Solutions-Online-Exclusives-November-200.aspx

Pay special attention to the Mach diffuser, this is an even more quiet and efficient design that I had initially described. As stated before, there are a number of steam injector heater manufacturers here in the States.

Currently I cannot find any CAD drawing but of intuition can you tell me that the internal & the largest bore in the center of injector ...is it a see through? I mean can I see through steam inlet to the opposite side via central bore?

I am not the expert on that company's product, why not ask them instead? They can guide you to the product fit for your application.