What Are the Implications of De-rating Boiler Pressure Below that of Boiler Design Pressure

Is it appropriate on your plant to reduce the boiler operating pressure with a view to saving money on fuel costs, when you consider both the effects on the plant and equipment and the associated risks of making the necessary changes?

In these days of pushing the boundaries on energy efficiency it’s very easy to connect a lower working temperature in a boiler to a lower flue gas temperature and therefore higher efficiency; but is that really the case?  While it’s true that a 15°C reduction in flue gas temperature will save most steam users 1% of the boiler running cost, it isn’t quite that simple when it comes to looking at the effect on the system as whole.

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Adrian Rhodes – CEA Vice Chairman