Heat Exchanger Coal Boiler Superheater And Reheater For Generating Furnace

The function of Super heater in the thermal power plant is to remove the last traces of moisture from the saturated steam coming out of boiler and to increase its temperature above saturation temperature as per requirement at inlet of steam turbine.
 

Details

Superheating raises overall efficiency as well as avoids too much condensation in last stages of turbine which avoids blade erosion.
The heat of combustion gases from furnace is utilised for removal of moisture from steam and to superheat the steam.
Super-heaters ususlly have several tube circuits in parallel with one or more return bends,connected between headers.
Heat from the hot gases to the vapour in the surperheater is transferred at high temperatures.
Therefore promary section of superheater is arranged in counterflow and secondary section in parallel flow to reduce the temp.stressing of the tube wall.


Principle

Principle of superheater is similar to steam generating tubes of boiler.
The hot gases at high temperature sweep over superheater tubes and raise the temperature of steam which magnitude depends upon exit gas temperature leaving the superheater and gas velocity.
use for heating saturated steam, steam temperature could be up to 900 degree C.
Superheater Capacity Upgrades to Increase Power Generation
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Function

Superheater is to increase the temperature of the steam above its saturation point.
Reheater is basically a superheater that superheats steam exiting the high-pressure stage of a turbine. The reheated steam is then sent to the low-pressure stage of the turbine. By reheating steam between high-pressure and low-pressure turbine it is possible to increase the electrical efficiency of the power plant cycle beyond 40%.The reheat cycle is used in large power boilers since it is feasible economically only in larger power plants.