Protection of boiler tubes 3

[21121956]

Hello everybody:

We have in operation several waste heat boilers, installed after medium speed Diesel engines. They are water tube boilers and produce 3760 kg/h of saturated steam, @7 barg and @170ºC. They were put into operation 15 months ago.

After this period of operation, we have found that the schedule of the tubes (80 mm in diameter) has been reduced drastically, to the point of rupture.

Is there any treatment we can apply to these tubes? Maybe some especial paint or resin? or we should have to change the material of these tubes?

Your help will be very much appreciated.

Ricardo

 

[rmw]

Because soot blowers are used intermittently, the metal parts in the steam path are initially colder than the steam and the first steam to come from the blowers could be wet. Try orienting the rotation such that the first part of the soot blower arc is not blowing directly on the tubes, but into space. Give as many degrees of rotation possible in before the steam actually impinges on the tubes. Hopefully your steam will be dry by then.

rmw

 

[rjoaks]

In The old days, Foster Wheeler Corp made a cast iron extended surface gill ring boiler for diesel engine service. The tubes were made by shrinking cast iron sections on carbon steel tubes. These boilers were also used in sulfuric acid plants to burn sulfur.
I don't believe they still make these boilers but I believe there may be others who do.
Why not try high pressure air in the soot blowers
vty rjoaks