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Efficiency of 8TPH Coal Fired Boiler

2016-10-31 16:32:48

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

coal fired steam boiler efficiency

coal fired steam boiler

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.

ZBG is a professional and trusted boiler manufacturer, if you are looking for a new boiler, contact us by TEL 86-371-86062323 or EMAIL zbg@zzboiler.com

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