Boilers specific fuel consumption

Some explanation is required for specific fuel consumption of 1.56MMBtu/klb steam. About 5-10% of the boiler gross steam is used internally for spinning steam turbines to run water circulation pumps and air fans. As an average, 7% internal... 

The usual response to the apparently high and out-of-specification result is to correct the problem by increasing boiler blowdown. The net result is an unnecessary waste of BD water and the heat associated with it. Consequentially, there is an unnecessary increase in fuel consumption. 

An estimate of emissions of a species from a source is based on a technique that uses emission factors, which are based on source-specific emission measurements as a function of activity level (e.g., amount of annual production at an industrial facility) with regard to each source. For example, suppose one wants to sample a power plant s emissions of S02 or NO. at the stack. The plant s boiler design and its fuel consumption rate are known. The sulfur and nitrogen content of fuel burned can be used to calculate an emissions factor of kilograms (kg) of S02 or NO emitted per metric ton (Mg) of fuel consumed. 

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