Re: Steam Blanket vs Boost

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Posted by Raymond on July 08, 2001 at 05:37:02:

In Reply to: Steam Blanket vs Boost posted by Jimbo on July 03, 2001 at 18:14:07:

: We have 3-500 hp CB firetube steam boilers. We normally steam 1 except for Dec-Feb. The idle boilers boost from 98-124 psi every 5 hours.

: Would it make sense to put the idle boilers under a steam blanket from the online boiler, and steam
: down the water level in the idle boilers daily.

: Is this a worth while energy and wear and tear saver?

: How long would it take for the water level to rise
: 6" in this boiler. Normal operating Pressure is
: 90 psi.

: We have minimized cooldown of idle boilers by installing tight sealing stack damper control.

Although I second Tony Connerís opinion I would like to ad some remarks:
- Apart from the nitrogen blanket make sure there is a considerable excess of oxygen scavenger in the boiler water. Check this on a regular basis say ones a week.
- You should also take care of the fire side of the boiler. The best option is to clean the flue gas side. The second best is to put the boiler on 100 % gas firing at least twelve hours before shut down of the boiler. Further make sure that the temperature flue gas side never drops below its dew point. Normally some extra heating is needed. Possibilities for extra heating are steam heating of combustion air by either the existing or a temporary heating coil.

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