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Re: boiler water chemistry

Feedwater pretreatment can drastically reduce the amount of water
treatment chemicals that are needed.  It also can reduce boiler blowdown,
reduce scale-removing needs, and increase heat transfer efficiency
(because of less scale). Reverse osmosis is a pretreatment alternative
that has really come down in price and that has found uses in large scale
feedwater pretreatment applications -- like for refineries. 

Whether feedwater pretreatment will be economically feasible depends on a 
number of factors, like what contaminants are present in the feedwater and 
how many problems will be solved by pretreating.  It's not necessarily an 

 Kirsten Sinclair Rosselot, P.E.                   Process Profiles 
                                                      P.O. Box 8264 
 1-818-878-0454                            Calabasas, CA 91372-8264
 rosselot@netcom.com                                         U.S.A.

> Hydrazine is used by the power industry to remove dissolved oxygen in
> the boiler water to prevent corrosion.  Apparently during startpup
> hydrazine also helps to form a passivation layer that protects the
> system.  Does anyone know of any effective, less toxic alternatives to
> hydrazine?