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In a coal fired boiler furnace temp. is high but super
heater out let temp. low what reason for this?
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Answer Posted / y v subba rao
Final super heater inlet steam temperature is well below than flue gas temperature of that zone(400degrees). Steam travels trough super heater coils with higher velocity(may be 25m/sec) as per the boiler design to meet the steam requirement of turbine. Hence the pretension time of steam is very less in super heater zone. More over there is always a temperature difference across the tube thickness. Due to this reasons super heater out let steam temperature is always much below than flue gas temperature in that zone. However the boiler itself will be designed in such a way.
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