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Silica in condensate

Saturday, May 12, 2018   By: Shareef luberef [2259] 0 Stars
We have problem with silica 39PPB+ in condensate polishing package outlet. We use ACF and a mixed bed strong acid/base exchanger. Still silica level is high. can u suggest method to control the silica. We use Desalinated water conductivity 5us/cm max. feed to our DEMIN unit to produce demin. water conductivity 0.1 us/cm max.

can u help me to find the source and control measures?

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Monday, May 14, 2018   By: Basem Belal [2194] 2 Stars
better to tell us how much the silica in the steam? what is the purpose of your steam? is it for steam turbine? how much P & T ? do you have one boiler or more? are they connected together by saturation steam in any line?
any details will help more.

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Tuesday, May 15, 2018   By: Ross Burns [390] 5 Stars
I am not sure what your makeup water arrangement looks like, but if you are using ACF -activated carbon filtration- then I can guess that you have a RO reverse osmosis unit inline with it too. As I expressed earlier I am not sure how the ACF applies, except you are either recycling effluent back into the plant for the boilers or you are drawing water from a river or body of water that needs pretreatment of the boiler makeup water because of what is in the water source. So, I can imagine that the source of your Silica SO2 or Silicates SO3 is from the same pretreatment sources. Of course this makes the assumption you have no leaks in your surface condenser if you have one.

Basem Belal has asked a very good set of questions to take the guess work out of the answers. Maybe you can answer his questions.


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Thursday, May 17, 2018   By: Murphy [21] 4 Stars
It seems to me that if your condensate polisher is upstream of of your make up water then you have a leak. I think you are going to have to sample the water at each component or heater in the condensate system from the hot well to the condensate polisher to find the source of silica. Seems your infiltration of silica is from your brackish water, which I think you are located where salt water meets the mouth of a river.

I also think you should be measuring the silica in the steam going to the steam turbine generators. It will be problem if you are loosing steam turbine thermal efficiency.


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Monday, May 21, 2018   By: Jim Watts [764] 5 Stars
Your configuration implies a very high pressure boiler and turbine.
You do not say your silica after poishing is high at start of run or at end of run so I will assume it is continuous slippage.
Although it is possible to imagine multiple problems to cause this it is unlikely your operation would have more than one and it needs to supply silica and at the same time degrade your polisher.
I would check your regeneration acid and caustic has not had a change of quality and contains silica.
High slippage can also be due to organic fouling of the anion resin or poor mixing of the mixed bed but you should not have silica in the first place.
Checking silica before the mixed bed should confirm this.

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Wednesday, May 30, 2018   By: MW [2231] 1 Stars
Please also tell us:

Silica in boiler water
Silica in feed water
Source of condensate
Silica in steam for turbine
Steam pressure / temperaure
Temperature of caustic for regeneration

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Published on steamforum.com


High Sulfite Residual
By: Ross. [390]

First, I want to say that large amounts of Sodium Sulfite NaSO3 becomes a contaminate because it will produce foaming and other problems, but foaming is the primary problem.

Your 500-psi Water Tube Boiler is seems to have reasonable level of residual Sodium Sulfite NaSO3 remaining in the boiler water. Nice pH too.

Your 300-psi Waste Heat Recovery Boiler has twice what I would expect for Sodium Sulfite NaSO3 at ranging 80-ppm to 100-ppm. pH is good so you are getting a good yield.

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