Heat transfer occurs between the feed water temperature in the tube with extraction steam from the steam turbine and the drain of the Feed Water Heater on the top shell. Condensate Pump Condensate water is pumped by the deaerator through LPH 1, 2 and 3 respectively. Then the feed water is pumped by a Boiler Feed Pump (BFP) to the economizer to advance through the timber 5, 6 and 7. Another function of the heater is to improve the steam quality, which capture some steam at the turbine blade will reduce the wetness of steam, thereby reducing the effect of condensation heat transfer processes Most of the heater on the condensing section occurs. Although superheating made very high temperature, the heat transfer in desuperheating section remains small. Drain the cooling is the smallest part of the process of heat transfer in the heater.
A. A condition
One or more non-contiguous heater (nonadjacent - one chasing turbine) can be out of service from the system.
Example: Heater 7, 5, 3 out of service. Load 100%
2. The condition B
If there is a heater that successive (adjacent) in the out of service then the load can still be maintained as long as there is above all the heater come on out of service.
Example: Heater 7, 6, 5 out of service. Load 100%
3. The condition C
Turbine heater can be operated with the highest in service and a combination heater out of service sequentially below. Load must be reduced 10% when there are 2 consecutive heater out of service, reduced 20% when there are three successive heater out of service. Reduction of the maximum allowable load is 50% of the nameplate. Loading beyond these limits is the responsibility of the owner.
Example: Heater 6, 5 out of service. Load 90%
Heater 6, 5, 3, 2 out of service. Load 90%
Heater 6, 5, 3, 2, 1 out of service. Load 80%
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