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Re: Reducing Chloride Corrosion in Municipal Solid WasteFueled Boilers



Ihab:
Haynes Intl. makes tubing and plates which are used in the chemical processing industries.  They make a wide verity of Hastelloy alloys used in corrosion resistance high temperature processes.  Their web site for technical information is, WWW.haynesintl.com or call them at 1-800-531-0285.  The product oxidizing resistance is about 99 times better then stainless steel.  
If the material is available, in the tube size, for replacing corroded tubes in boilers.  The added cost should be offset by the longer usage befor replacing.   
I've used Hastelloy alloy in piping of corrosive gases to  tools that  are used in the semiconductor processes.

Leo Lujan


Western Regional P2 
Information Clearinghouse
(800) 700-5854
(fax)  (916) 327-4494
c/o DTSC/OPPTD
P.O. Box 806,
Sacramento, CA 95812-0806


>>> Ihab H Farag <ihab.farag@unh.edu> 03/12/00 05:55AM >>>
March 11, 2000

Hello

Municipal solid waste (or trash) is often burned in a
boiler to generate power. Compared to traditional fuel
burning (like coal, or oil) the municipal solid waste has
a high content of plastics and other materials. These
material contain chlorides. At high temperature burning,
these chlorides are released in the hot gases. When the
hot gases come into contact with the boiler tubes, the
chlorides in the vapor cause corrosion of tubes, and as
result, damaging the tubes.

The approach taken by the industry has been to replace
tube metals when corrosion starts. This creates a
pollution problem and is an expensive approach.

P2 basics suggest elimination of chloride substances from
the burned municipal waste. This is not a possible
solution. Actually, as more paper gets recycled, the
plastic content of the municipal waste will increase.

The question is: Are there suggested approaches to
prevent the corrosion of these heated tubes? Is it
possible to inject some chemicals into the boiler, or add
chemical(s) to the municipal waste that will capture the
chlorides and reduce the corrosion.

I welcome any comments or ideas. Thanks.

Ihab Farag

Ihab H. Farag, Sc.D., P.E.         * E-Mail: ihab.farag@unh.edu  or
Robert C. Davison Professor        *         ihf@christa.unh.edu 
Chemical Engineering Department    * Phone Off: (603) 862-2313
University of New Hampshire        *      home: (603) 868-5603
33 College Rd (255 Kingsbury Hall) *      Fax : (603) 862-3747
Durham, NH  03824-3591, USA        *
homepage:
    http://pubpages.unh.edu/~ihf 

N.H. Pollution Prevention Partnership homepage:
    http://pubpages.unh.edu/~ihf/pp2.html