People are always concerned about the boiler price and efficiency, for even 1% efficiency improved can save large money finally. We know there are two methods to calculate a boiler efficiency: direct method and indirect method, of which the direct method is much easier than the indirect one. Here we use the easy way to calculate a 8 ton coal fired boiler efficiency.
Before we start the calculating, we should to know the parameters for the calculation of boiler efficiency by direct method are :
Quantity of steam generated per hour (Q) in kg/hr.
Quantity of fuel used per hour (q) in kg/hr.
The working pressure (in kg/cm2(g)) and superheat temperature (oC), if any
The temperature of feed water (oC)
Type of fuel and gross calorific value of the fuel (GCV) in kCal/kg of fuel
where, hg - Enthalpy of saturated steam in kCal/kg of steam
hf - Enthalpy of feed water in kCal/kg of water
After we grasp the method, we can find out the efficiency of the boiler by direct method with the data given below:
- Type of boiler : Coal fired
- Quantity of steam (dry) generated : 8 TPH
- Steam pressure (gauge) / temp : 10 kg/cm2(g)/ 180oC
- Quantity of coal consumed : 1.8 TPH
- Feed water temperature : 85oC
- GCV of coal : 3200 kCal/kg
- Enthalpy of steam at 10 kg/cm2 pressure : 665 kCal/kg (saturated)
- Enthalpy of feed water : 85 kCal/kg
It should be noted that boiler may not generate 100% saturated dry steam, and there may be some amount of wetness in the steam.
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