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TSP TriSodium Phosphate

Thursday, February 15, 2018   By: MM [2231] 0 Stars
Hello,

We currently dose TSP TriSodium Phosphate before our economiser and after the take off for de-superheating spay water. Am I correct in thinking that it is after de-superheating spay due to problems caused by phosphate depositions if it was to be dosed directly after the feedwater pump?

Thanks.

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Thursday, February 15, 2018   By: Murphy [21] 4 Stars
Using any treated feedwater for spray attemperation whether TPS or not is a problem for desuperheating. I think of this method as a poor substitute for pure water. I have seen this situation many times that you described over my life time career and more often than seeing a sweetwater condenser or a water drum coil to create pure distilled water. Dont get me wrong, boiler feedwater is pretty clean, but not distilled pure. Spray attemperation will always be a problem for deposits and in the long run will show less control of controlling a stable superheater temp. especially on load changes.

Murphy

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Thursday, February 15, 2018   By: Murphy [21] 4 Stars
Oops! I meant TSP and not TPS.

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Thursday, February 15, 2018   By: WN [2231] 0 Stars
Thank you. So if I understand correctly, the problem with using TSP treated water for spray attemperation would be deposit formation?

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Thursday, February 15, 2018   By: Murphy [21] 4 Stars
Just to reconfirm, using any feedwater, which is never distilled pure, will cause deposits whether treated with what every miracle chemical treatment or not. TSP is good for your boiler water, but will cause problems with attemperation equipment and steam line eventually. It is a short term solution.

Murphy

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Friday, February 16, 2018   By: Jim Watts [764] 5 Stars
The water used for attemporator spray is evaporated to steam. Any solids such as TSP in the water is therefore left as solids in the steam flow and can accumulate as scale on bends. Volatile chemicals which also evaporate to gas or vapour are perfectly ok dosed at the dearator to protect the feed piping and the boiler eg hydrazine.

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Saturday, February 17, 2018   By: basem belal [2194] 1 Stars
yes it is correct, the designer of your boiler choose dosing point of TSP after take off spray water for De-super-heater to avoid deposits coming into super-heater coils, steam pipes, valves and any equipment in the steam way.
it is not recommended to take the spray from feed water, the best to have condensing system above the drum feeding by saturated steam from drum and taking this condensate for spry it to control steam temperature.
I saw this situation before in five boilers in different countries and also I saw the deposits in steam line and valves.

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Sunday, February 18, 2018   By: Jim Watts [764] 5 Stars
It is not recommended to take spray water from Feedwater of Boilers being fed with softened water instead of Demineralised Water usually boilers around 18 bar or less. In such cases a source of condensate from a special condensing vessel above the drum is required.
In poorly controlled boilers usually in industrial service such as refineries, frequent foaming in the drum causes carryover of phosphate which then appears on valve stems and flanges with slight steam leaks.
My guess is you have refinery experience .

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Monday, February 19, 2018   By: basem belal [2194] 1 Stars
here I put some photo for deposits inside one control valve.

PicturePicturePicture

Click on picture for full size view or to view PDF!

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Monday, February 19, 2018   By: Murphy [21] 4 Stars
Excellent photos of a spray attemperator nozzle depicting deposits. Just by looking at the blockage we can see how maddening trying to control the downstream temperature when the buildup starts.

Murphy

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Monday, February 19, 2018   By: Jim Watts [764] 5 Stars
Im not sure if you are trying to show the copper corrosion in your condenser or the foaming from your drum reaching overhead condenser.
It is not what you find in a Demineralised water spray.

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Tuesday, February 20, 2018   By: basem belal [2194] 1 Stars
dear Jim,
this photos from one boiler in sugar plant, boiler running pressure is 25 bar, they take the spray water from feed water line, but their problem happened because they were using soft water and by time TDS reached to high value 60 ppm, then they get this problem.
agree with you if you use Demi water for control main steam temperature you will not face the same problem. but still the best way is to use condensate water for De-superheater.
thanks for valuable notes.

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Tuesday, February 20, 2018   By: Jim Watts [764] 5 Stars
While I stand by Demin water I would just like to clarify for inexperienced readers that the condensate you are refering to is not just any old condensate but a special supply from a dedicated condenser cooled with boiler feed water whose condensate is called sweet water.

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