22-03-2014, 04:57 PM
ENERGY PERFORMANCE ASSESSMENT OF BOILERS
ENERGY PERFORMANCE.pptx (Size: 402.28 KB / Downloads: 20)
Boiler performance
Causes of poor boiler performance
Poor combustion
Heat transfer surface fouling
Poor operation and maintenance
Deteriorating fuel and water quality
Heat balance: identify heat losses
Boiler efficiency: determine deviation from best efficiency
Advantage & Disadvantage of Direct Method
Advantages
Quick evaluation
Few parameters for computation
Few monitoring instruments
Easy to compare evaporation ratios with benchmark figures
Disadvantages
No explanation of low efficiency
Various losses not calculated
Required calculation data
Ultimate analysis of fuel (H2, O2, S, C, moisture content, ash content)
% oxygen or CO2 in the flue gas
Fuel gas temperature in ◦C (Tf)
Ambient temperature in ◦C (Ta) and humidity of air in kg/kg of dry air
GCV of fuel in kcal/kg
% combustible in ash (in case of solid fuels)
GCV of ash in kcal/kg (in case of solid fuels