Energy Conservation by the Combination of the Fire Tube Boiler + Once Through Boiler
The variation due to burden of usage of steam, that is applied to the boiler is not constant. For example, as shown in the graph below, in one day, A: If the usage is constant roughly, B: If the usage is different significantly in day and night, C: 2 ~ 3 of the day there is a peak time only. If the usage of steam up and down extremely, energy saving can measure by a combination of boiler different type.

 

 

For example, case B, might load in less than half of day load.
KM+K boiler operate at day time and K boiler operate at night time only.