Re: alkalinity of boiler drum water

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Posted by David Bobkoski on October 02, 2001 at 17:02:11:

In Reply to: Re: alkalinity of boiler drum water posted by Abid Q.Alvi on September 14, 2001 at 22:02:30:

I Would not recommend having a zero percent OH- Level within a process boiler operating with an organic polymer treatment. Due to that it is near impossible if your feedwater contains some carbonate form of alk. This is due to the fact that carbonate breaks down under temperature to from co2, and oh- ...In most industrial applications (Non superheated) the Minimum Oh- should be at least 50 p.p.m. Keep in mind this level is normally only present, during very low loads, or when either a splitsteam, or full cycle cation-anion demineralizer is employed.
If your p.h. Before the deareator is near 8.0 then it is most likely that you will not need any alk. addition.

: how to improve boiler pH?
: my boiler working at 40bar/385c for process useage
: amine
: sodium tripoly phosphate
: and DEHA
: the above chemicals are of BUCKMAN but found not effective.
: Frequent use of Caustic is a common practice for pH improvement.
: Would u suggest caustic free pH enviornment for boiler.
: Also will be appriciated water and steam quality
: like pH, cond,SiO2 and other matters parameters the latest one.
: Thanks a lot.

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