Steam System Thermal Cycle Efficiency – A Important Benchmark in the Steam System
A question that all steam system managers need to answer is the steam system thermal cycle efficiency. The average steam system thermal cycle efficiency is 58%, which means that 42% of the energy that is consumed in the boilers is wasted or loss. To utilize all the energy input into the boilers is not achievable and the operation will have a few acceptable losses, but a high percentage of losses can be prevented or eliminated.
The total system is shown in Figure No. 1
Total fuel energy or Btu’s input into the boiler to generate the steam
Btu’s that are recovered and delivered back to the boiler plant
- When benchmarking the thermal cycle, the sensible energy in the condensate and quantity that is delivered back to the boiler is considered the recovered energy.
- The deaerator uses steam from the main steam line maintain pressure and temperature on the deaerator, therefore can not be the benchmark for recovered condensate.