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Posted by Pete on January 12, 2004 at 12:11:20:
In Reply to: Re: 600# 700 degree superheated steam boiler bottom blows posted by David on January 12, 2004 at 06:45:29:
: What do you mean by bottom blow? Blowing down via a mud drum blowdown should not cause any problems, as it should not adversely affect the circulation inside the boiler. We have done this in the past when we have had high silica excursions, or a pH excursion to speed up the turnover of the boiler water with good feedwater. It is not good practice however to leave the valve open for more than about 2 minutes.
You should never open a waterwall header drain when a boiler is on line as this WILL interfere with circulation. The result will be overheating leading to tube failure.