Losses and Efficiency in Thermal Power Plant
% of heat losses at different stages in a thermal power plant.
|
Stages |
% |
|
To dry flue gases To moisture in gases To ash and unburnt carbon To radiation and leakage Unknown losses Heat rejected to condenser Alternator losses |
5% 5% in boiler 1% 2.5% 2.5% 54% 1% |
|
|
Total 71% |
Hence overall efficiency is only 29%.
How to Improve efficiency of thermal power plant ?
- The steam turbine is operated at high temperature and high pressure.
- The condenser is operated at low pressure.
- The steam is reheated between turbine stages.
- Bleeding of turbine is done to improve the thermal efficiency.
The overall efficiency can be improved upto 40 % with above methods.