Stack gas temperature is a parameter that effects the efficiency of a steam boiler and needs to be traced closely. An increase in stack gas temperature affects boiler efficiency negatively. When the stack gas temperature is higher than the accepted value, heat is lost from the stack to the atmosphere. Every 20°C increase in temperature causes a 1% decrease in boiler efficiency.
Fuel and the required amount of combustion air are fed into the boiler. The fuel reacts with the oxygen in the boiler and flue gas is drawn out. Released heat is captured by the water pumped into the boiler, transforming it into the steam that flows from the boiler. Sign in to download full-size image
Nov 01, 2008 · The heat input required by the boiler to produce the required steam is only 1,149.1 Btu/lbm (1,474.1 325.0), while the feedwater temperature is much warmer. Thus, …
Boiler efficiency has an influence on heat transfer to the water where various losses by hot flue gas, radiation, unburnt fuel, moisture content of the air and fuel and blowdown etc. as the temperature of the flue gas leaving a boiler typically ranges from 150-250 0C, about 10-40% of the heat energy is lost .
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