Answer / randhir singh yadav

Two reason
1. Scale deposit inside the boiler & superheater tube,
2. Soot deposits outer surface of boiler & superheater tube,

Answer / ritesh patel

The specific heat of water is higher
than that of air.

Answer / 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.

Answer / pradeip

because we designed boiler like that, what temperature we
require.

Answer / lalit shukla

high cal value of coal is also the reason if we use high
amount of petcoke then furnace temp high but boiler outlet
steam temp not high

Answer / k.p.selvakumar

1.super heated coil have any leak or puntcure.
2.continousely opened condition of attemperator valve.
3.opened all turbine draine valves in trip condition.
4.forced draught fan tamper open value high.
5.operating problem having in super heater outlet valve to main sream line.

Our 8mw steam turbine (condensing cum extraction) exhaust steam temperature is high even after taken it in hogger why

1 Answers   Bombay Rayon Fashions,

why seal air fan is used and where it is used and where is suction taken from

7 Answers   Bhel, ETO,

What do mean by 3t

1 Answers   Aman, Birla, Grasim,

what is voltage transformer explain in details

5 Answers   Khulna Power, NCC, Reliance Power,

What will happen if id fan on boiler not functioning?.Can the Boiler run without id fan? What is the effect?

4 Answers  

Why reheater is not used after IP turbine.

3 Answers   Hindalco, SEC,

what equipment is most efficient in power plant?

4 Answers   Adani,

what is the difference between flow and force ,draught and vaccum ,tube and pipe?

3 Answers  

Why cold water is used for Boiler Hydro test

1 Answers  

What will happen if the Air Preheater is placed before the Economiser?

6 Answers   Bhel, KSPL, Tata Power,

How We Calibrate the vaccum transmitter?

0 Answers  

why the Steam Turbine(20MW)center line and gear box center line not in same elevation during coupling alignment ?

3 Answers   Greenesol Power Systems,