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Chloride limits in boiler water

Thursday, September 13, 2018   By: basem belal [2194] 2 Stars
dear all what is the limits of chlorides in feed water tank and in boiler water, for 45 bar water tube boilers?

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Wednesday, September 19, 2018   By: MWN [2231] 1 Stars
Please, tell us what you are currently measuring. Have you noticed any pH decrease? What is the purpose of the steam?

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Friday, September 21, 2018   By: basem belal [2194] 2 Stars
Chloride is 6.5 ppm in feed water tank, the same in boiler too.
we have steam turbine in the way of steam, we use Demi water depending on R.O and mixed bed to get make up water source of water is river.
I decreased it by blowing down from boiler, but what is the limits of this value.
PH in normal range after feed tank and in boiler drum.

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Wednesday, September 19, 2018   By: Ross Burns [390] 5 Stars
This is a good question regardless of the pressure like your 45-bar or 650-psi steam boiler. Chloride limits in a Rankin cycle or steam cycle is important to when there are stainless steels in a nuclear power plant. A good reason to test for Chlorides in your fossil fueled boilers feedwater is to determine if there is a problem in a demineralizer or ionic exchanger for acid is used like HCl to recharge the cation bed. Of course there can be other sources of Chlorides that may be unique to your plant, but you need to account for the source of the Chlorides.

There are no standards identifying limits or ranges that I know of for Chlorides in a boiler.

Ross

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Friday, September 21, 2018   By: basem belal [2194] 2 Stars
thanks for your answer, it seems that no known limits for it, I dont have stainless steel in the boiler but what about other effects coming from Chloride?
Chloride can be come from water treatment programs any way.


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Friday, September 21, 2018   By: Ross Burns [390] 5 Stars
You will need to review the your boiler water treatment chemicals and look for Cl or Chloride in the molecules that make up the treatment chemical. It is unlikely to be in your treatment chemicals, but I would expect it as a back wash to recharge the cation bed in the form a HCl hydprchloric acid. If it is, then carry over may be occurring. Look at your Deminerallizer operation.

Ross

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Saturday, September 22, 2018   By: basem belal [2194] 2 Stars
I will check water treatment plant to find the source of Chloride, many thanks.

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Friday, September 21, 2018   By: Jim Watts [764] 5 Stars
Chloride limits are not widely used because you will reach other limits long befor you reach chloride limits.
This is because chlorides to not change under boiler temperatures and precipitate or take part in any of the water treatment reactions.
This makes chloride ratio from feedwater to drum water represent the correct concentration of cycles and is why it is measured by water treatment chemists but is not controlled by its own limit.
The use of stainless steel does introduce problems which mainly arrise when pressure testing with undemineralised water otherwise chloride is low due to other limits in boiler.

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Saturday, September 22, 2018   By: basem belal [2194] 2 Stars
analysis report

Picture

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

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Sunday, September 23, 2018   By: Jim watts [764] 5 Stars
This result is inconsistent with what I said previously and something must be wrong.
There are not enough results to be certain but it looks like your feedwater chloride is reported 10 times higher than it is.

The tds of feedwater shows water concentrating 10 times approx.
The tds of boiler water is high enough to contain the amount of chloride but the feed water not.
The results of analysis are never accurate enough to allow mathematical exactness but you can see what is happening.

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Sunday, September 23, 2018   By: basem belal [2194] 2 Stars
thanks Jim, I have the same doubt, it is better for me to check the procedure of measuring Chloride.

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Featured
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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