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Low pH of Boiler HP water HRSG

Saturday, December 30, 2017   By: Fazal [2214] 0 Stars

We have HRSG with three drum LP, IP and HP. Pressure of HP drum is 120. We have facing problem of low pH 5-8 and Low PO4 in HP drum in spite of continuous dosing of Tri Sodium Phosphate. Conductivity of boiler water is also high i.e about 200 us/cm. While Feed, Hot well condensate pH and steam pH is ok. We dosing Ammonia and Hydrazine in feed water system.
Beside this Sio2 in both IP and HP Boiler water is higher than Limit i.e above 500-900 ug/l. but Sio2 in feed and in our demi storage is within limit i.e less than 10 ug/l
Please solve our this problem that what are the causes that:
1. pH and Po4 is not maintaining in HP boiler.
2. High conductivity of Boiler water.
3. High Sio2 in Boiler water.

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Sunday, December 31, 2017   By: Murphy [21] 4 Stars
Your Boiler HP section in your HRSG is experiencing Phosphate Hide-out. To learn if this is Phosphate Hide-out just lower the boiler HRSG firing rate to a low steaming rate then wait and do water treatment tests. I would expect your water treatment readings to right themselves. Your professional water treatment people should help you resolve this.

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Sunday, December 31, 2017   By: Jim Watts [764] 5 Stars
Since all of your feed and condensate is normal but your boiler water is high in silica conductivity and low in PH and you are pumping in chemicals continuously I would say your problem is in your chemical feed tank.
You should not increase silica unless you have stopped blowdown or are pumping it in.
Phosphate hideout should increase PH when phosphate goes low.
It is possible you are pumping in monosodium phosphate which will reduce PH and may cause hideout at the same time.

Increase blowdown to control silica and TDS
Change your chemical dosing tank over to a new batch of TSP
Vary the load a bit as Murphy suggests

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Is Cp/Cv applicable to steam to calculate?
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So for all gases and/or steam the work required to expand a given volume is the same that being the work required to displace our atmosphere by a given volume.

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