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Q. Explain about Ducts and Flues in steam generators?
All air ducts and gas flues connecting the forced draft fan, fan intake silencer, preheater, and transition piece at the generator outlet shall be supplied.
Ducting shall be of continuous seal welded construction to ensure air tightness, with gasketed / flanged connections for field assembly.
Ducting shall be adequately reinforced and stiffened.
Ducting design shall be based on maximum discharge fan pressure at minimum design temperature. Maximum velocity in intake duct shall be 60 ft/s (18.3 m/s). Maximum velocity in flue gas shall be 90 ft/s (27.5 m/s).
Ducting shall be sized to limit the dynamic head at the point of maximum velocity to no more than ten percent of the burner pressure drop at firing conditions.
Minimum thickness of air ducting shall be 3/16 in (5 mm) for air ducting and 1/4 in (6 mm) for flue gas ducting.
Types Of Polymerisation When some of bifunctional molecules connect in a chain structure, the reaction is termed as addition polymerisation. However, these polymerizations do
Q. What do you mean by Alloys? Metallic materials that contain alloying elements, including chromium (Cr), cobalt (Co), Columbium or niobium (Cb or Nb), copper (Cu), iron (Fe),
Q. What is Coating Thickness? The dry thickness of the coating shall be checked by using a "micro test" magnetic gauge or approved equal which has been properly calibrated, at
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Compute the angular velocity of the wheel: A wheel of 0.5 m radius rolls over a horizontal surface without slipping as illustrated in Figure (a). The velocity of its centre is
A28) cm diameter pipe carries oil of sp. gr. 0.9 at a velocity of 3 m/s . At another section diameter is 20 cm. find the velocity at this section and also mass rate of flow of oil.
Parallelogram law of forces: The law of parallelogram is used to determine the resultant of two forces acting at the point of a rigid body in plane and is inclined to each o
Q. Why we use Nickel Alloys in welding? Nickel weld metals have high creep-rupture strength but often have lower stress-rupture ductility and lower mechanical and thermal fatig
A suspended walkway in an underground cavern consists of a deck supported by three tie rods placed symmetrically about the centre as shown below: The rods are each of
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