0 votes
60 views
asked in power plant by (215k points)

From the following data for the underfeed stoker boiler, find draft required in mm of water column and power required to drive the fan:

      Mean temperatures of flue gases

              passing through duct – 227 0C

      Plenum pressure – 15 cm of water

      Atmospheric pressure – 75 cm of Hg

      Mean velocity of flue gases in duct – 900 m/min

      Length of the duct – 150 m

      Mean size of the non-circular duct – 75 cm2k

      Number of 900 bends – 4

      Number of 450 bends – 4

      Loss of draft in every 900 bend – 0.1 cm of water

      Draft available from chimney – 1.5 cm of water

      Fuel bed resistance for underfeed stoker – 10 cm of water

      Fan efficiency – 60%

      Motor efficiency – 92.5%

Assuming that 450 bend is equivalent to one-half of 900 bend, resistance offered by non-circular duct is 20% higher than a similar circular duct, friction factor for circular duct is 0.006, find draft required to be produced by fan and the fan power for flue gases. Take R = 294.35 

Please log in or register to answer this question.

Welcome to Q&A discussion forum, where you can ask questions and receive answers from other members of the community.

10.4k questions

274 answers

26 comments

15.3k users

...