Media Center
HomeMedia CenterZBG Info

Coal Fired Boiler Efficiency Calculation

2017-12-19 16:10:26

coal fired boiler efficiency calculation

Coal fried boiler is a steam generating device, which produce steam with burning of coal fuel. If the fuel has higher gross calorific value, than it is able to produce more heat per kg of fuel. It is directly proportional to the efficiency.

In high capacity pulverized coal fired boilers, the total losses account to about 12 to 14%, i.e. 86 to 88% boiler efficiency. Roughly 50% of the losses can be tuned to the optimum and the other 50% is governed by fuel properties like hydrogen in fuel, moisture in fuel, and ambient air conditions.

This is only a theoretical value, boiler efficiency is mainly depended on the amount of losses in the system. The Losses method is used to calculate boiler efficiency. Each of the different Losses is calculated to determine the efficiency. For a coal fired boiler to calculate these losses we require these data.

Carbon loss

Carbon loss is due to unburned carbon in fly ash and bottom ash. Normally the unburned in bottom ash in the pulverised fuel firing are higher sized particle and of higher specific gravity having the unburned macerals like fusinite embedded in mineral matter and the low melting constituents encapsulating the reactive maceral. Fly ash of pulverised coal firing system is around 80 to 90 percent of the total ash removed. The normal types of unburned are inert macerals, cenospheres, and carbonaceous clay.

Dry gas loss

The dry gas loss accounts to about 40% of total losses. Dry gas loss is due to the heat carried away by the flue gases leaving the boiler. Today many of the boiler designers reduce this loss by recovering the heat after low temperature superheater by larger economizer and air pre-heaters. As designers go for lower and lower exit gas temperature the size of air pre-heaters go up.

Other losses

Like loss due to moisture in fuel, air moisture loss, loss due to hydrogen in fuel, etc also get affected by change in exit gas temperature, but the major impact on these losses is by fuel and ambient property.
Coal fired boiler efficiency % = 100 - sum of all losses %.

Products Recommended
DHL Corner Tube Biomass Fired Bo
DHL Corner Tube Biomass Fired Bo 10-160 t/7-112 MW
Pressure: ≤5.29MPa
Biomass Power Plant Boiler
Biomass Power Plant Boiler 10 - 75 t/ 7-52.5 MW
Pressure: ≤5.29MPa
Biomass Fired CFB Boiler
Biomass Fired CFB Boiler 20-280 t/ 14-196 MW
Pressure: ≤5.29MPa
DZL Packaged Biomass Steam Boile
DZL Packaged Biomass Steam Boile 2-10 t/1.4-7 MW
Pressure: ≤1.6MPa
Success Stories
3 Tons Gas Fired Boiler Exported
3 Tons Gas Fired Boiler Exported Application: Building materials industry
Capacity: 3 tons
49 Tons Waste Heat Steam Boiler
49 Tons Waste Heat Steam Boiler Application: Chemical industry
Capacity: 49 tons
Indonesia Customer Ordered 2 Set
Indonesia Customer Ordered 2 Set Application: Dry cleaning industry
Capacity: 8 ton
60 Ton CFB Power Plant Boiler Pr
60 Ton CFB Power Plant Boiler Pr Application: Power plant
Capacity: 60 tons
Checking Order Quality Test Before Delivery Check Items When Packing Packaging And Transport
Get An Instant Quotation

For all inquiries, please fill in the form below (* are required) to send us a brief message, and we will get back to you as soon as possible.

Product:
* Email:
Tel:
Name:
Boiler fuel:
  • Gas
  • Oil
  • Biomass
  • Coal
  • Waste Heat
  • Other
Application:
  • Textile Industry
  • Central Heating
  • Food Plant
  • Power Plant
  • Chemical Industry
  • Waste Heat Recovery
  • AAC Block Plant
  • Hotel & Resort
  • CHP
  • Other