Boiler (Steam Generator)



-The Boiler for 1,094 t/h MCR is Single Drum Radiant Natural Circulati** Boiler “ELPASO” Type which has self-drainable heating surface. The unit is of pressurized furnace design with two regenerative air heaters, two forced draught fans and two flue gas recirculati** fans. The boiler c**sists of the following equipment.



Steam drum
Water wall
Primary Superheater, Sec**dary Superheater and Tertiary Superheater
Reheater
Attemperators
Ec**omizer
Two forced draft fans
Two gas recirculati** fans
Two regenerative air heaters
Two steam coil air heaters
Ducts and flues
Gas and oil burner system
Steel structure
Piping and valves
Other auxiliary equipments










-The boiler and its auxiliaries are designed suitable for firing Natural Gas and back-up Mazout and for the following c**diti**s:-
Ec**omizer inlet to drum inlet : 203 bar(g)
Water wall : 204 bar(g)
Drum and superheater : 201 bar(g)
Reheater : 47 bar(g)


Superheater outlet : 541 °C 181.1 bar(g)
Ec**omizer inlet : 275.8 °C 194.9 bar(g)
Reheater outlet : 541 °C 37.6 bar(g)
Reheater inlet : 328.6 °C 38.9 bar(g)


-Superheater outlet steam Temperature is c**trolled to c**stant ****** the load range from 50% turbine to 100%BMCR by spray attemperati**.
-The reheater outlet temperature is c**trolled to c**stant ****** the load range from 50% turbine to 100% BMCR by flue gas recirculati**. The reheater spray attemperati** for reheat c**trol is used **ly as an emergency measure during periods of load changes or of low feedwater temperature due to heater outage, or at overloads.
-The main specificati**s of the boiler are:-

Type of boiler Babcock - Hitachi
Single Drum, Radiant, Natural Circulati** Boiler
Evaporati** (BMCR) : 1,094.4 t/h
Steam Pressure at SH outlet : 181.1 bar(g)
Steam Temperature at SH outlet : 541 °C
Feed water Temperature : 275.8 °C
Reheat Steam Flow : 941.4 t/h
Steam Pressure at RH outlet : 37.6 bar(g)
Steam Temperature at RH outlet : 541 °C
Steam Temperature at RH inlet : 328.6 °C
Ambient Air Temperature : 34.8 °C
Draught system : Forced draught
Fuel : N.Gas, Mazout Oil






That was a small descripti** of the boiler from (HITACHI BABCOK Company.), Used at Thermal Power Stati**, the next Post I will talk about each system of the Boiler.