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Subject: Re: Variable pressure operation

Date: 09/24/00 at 11:07 PM
Posted by: Fred Pfeifer
E-mail: PfeiferF@aol.com
Message Posted:

In Reply to: Re: Variable pressure operation posted by Anthony Salvarezza on 05/11/00 at 10:10 AM:

The heat rate savings for a drum type unit are primarily due to reduced pumping power. If electric boiler feed pumps are used, this is wasted due to throttle losses in the drum level regulator. If a variable speed feedpump is used, some savings will be realized. I have found that the primary benefit if variable pressure operation is the reduced turbine stress since the first stage inlet temperature is constant.

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