What the equipment can be use for inject sat.steam@60bar(g) direcly to heating water

[pjoxygenis]

Dear Sirs
I have some problem about steam direct contact heater.
I want to use sat.steam 60bar(g) to heating water from 105deg.C to 280deg.C at 60bar(g) by direct contact in the vessel.
then I would like to use "Steam injector" but mostly steam injector can be operate not exceed 20bar(g).
Please advised me following
1.What is the limit of steam injector operating pressure?
2.What method or application can be use in this case?
Thank for your advised

 

[TD2K]

Are you looking for something like this that you could heat the water as it enters the vessel?

http://www.hydro-thermal.com/produc...steam-injection-hydroheater/key-benefits.html

They are a little short of infomation on their flows, pressure and temperature ranges that I could see. You can also get direct steam injection into the incoming water sort of like a desuperheater in reverse.

http://www2.spiraxsarco.com/resourc...heating-tanks-and-vats-by-steam-injection.asp

Scroll down the webpage to direct steam injection.

Part of your decision in selecting how you do this depends on how your system operates and what it can tolerate, flow rates, etc.

I'm not sure what you mean by "I want to use sat.steam 60bar(g) to heating water from 105deg.C to 280deg.C at 60bar(g) by direct contact in the vessel" followed by "but mostly steam injector can be operate not exceed 20bar(g)"

If the maximum pressure of the vessel is 20 barg and you are using 60 barg steam to heat up the water in the vessel, you will have to provide adequate overpresusre protection for the vessel. That is typically done using pressure relief valves.

 

[georgeverghese]

Pls check the numbers again - saturated steam at 60barg is at 277degC - beyond 277degC, it is superheated steam.

 

[pjoxygenis]

For "mostly steam injector can be operate not exceed 20bar(g)"is from my opinion followed. I have asked supplier about 4 company. They said their product can't operate over 20bar and I want to heat water to sat.liquid at vessel pressure 60bar. Thank for you suggest
what the importance reaction to beware for steam direct to water?

 

[moltenmetal]

The danger is cavitation damage, not a "reaction" per se.

As a final "trim" heating step, live steam injection at high pressure can be successfully applied (by this I mean we've done it successfully, at a very small scale mind you, with nothing more complicated than a dip tube). But starting with 105 C water and 280 C saturated steam, you're going to encounter some serious trouble in my opinion, irrespective of how you design the device to contact that steam with that water. You'll need to do some indirect heating first.

 

[mbt22]

Have you miss-typed something?

I want to use sat.steam 60bar(g) to heating water from 105deg.C to 280deg.C at 60bar(g) by direct contact in the vessel.

As George says, 60 barg steam is 277 deg C. Assuming that 280 deg C is a rounding error, it's more like about 1 kg steam to 2 kg water, or 20 vol. steam to 1 vol. water. Unless there's something special about this application, this doesn't feel like the right answer - is low pressure condensate returning to the dearator of a boiler?

Matt

 

[georgeverghese]

The steam injector pressure limit is most likely a differential pressure limit, since the injector is not a pressure containing member - hence at 60barg in the vessel, steam supply pressure should not exceed 80barg.

Or, when vessel pressure is 40barg, steam supply pressure should not exceed 60barg. Even if it did rupture, it would not cause a loss of containment, since this injector is not part of the pressure containment wall of the vessel - Check if this is valid in this assembly.

Doesnt look like you've got anything to worry about re this injector's mechanical design limit, unless you plan to overload it on flow control and rip it to shreds due to high diff pressure. Even then, all you will have is a damaged injector inside this vessel.

 

[georgeverghese]

Am assuming the entire injector nozzle is a fitting bolted or screwed on to a nozzle which is within the vessel.

 

[EdStainless]

What did the guys at Pick tell you? I agree that it is probably a differential pressure limit.
But if you are pumping water in at 60bar how will 60bar steam enter the vessel?

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