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Boiler efficiency

Boiler efficiency software module works in the on-line mode and is designed for use with oil, gas, pulverized coal –fuelled fluidised and recovery boilers. Boiler efficiency calculated in-realtime is a measure of losses occurring when chemical energy of the fuel is transformed to thermal energy. Calculations are based on procedures compliant with the boiler device design and assumed boiler device balancing boundary envelope. Either DIN1942/94 or ASME PTC 4.1 standard may be used.
If liquid-fuels are burned, the boiler efficiency is calculated with the direct method, by developing a balance between the heat introduced to the boiler and the usable heat. In case, when the boiler is fuelled with solid fuels – an indirect method is used. In this case one calculates heat losses that allow the non-measurable chemical energy stream supplied with the fuel to be balanced.

  
 
 

If liquid-fuels are burned, the boiler efficiency is calculated with the direct method, by developing a balance between the heat introduced to the boiler and the usable heat. In case, when the boiler is fuelled with solid fuels – an indirect method is used. In this case one calculates heat losses that allow the non-measurable chemical energy stream supplied with the fuel to be balanced.


Boiler efficiency calculations are possible both if only primary fuels is burner as well as when multiple types of fuels are burned at the same time, e.g. coal and sludge; coal sludge and oil; coal and biomass. This allows boiler’s main heat losses to be also calculated with consideration for current operating conditions, including the volume of additive supplied in order to reduce the sulphur dioxide.

 
Boiler’s flue gas loss (being the main heat loss) as a function of oxygen content in combustion gas and flue gas temperature at the boiler outlet. This family of curves and the operating point are determined individually for current boiler operating conditions, e.g. air excess, temperature and flue gas moisture.