April 2015
Intermediate to advanced
888 pages
23h 21m
English
Content preview from Power Plant Engineering
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7
Draught System
Contents
7.1 Introduction to draught system
7.2 Air and supply systems (natural mechanical draught systems)
7.3 Chimneys
7.4 Calculations involving height of chimney to produce a given draught
7.1 INTRODUCTION TO DRAUGHT SYSTEM
Boiler draught is the pressure difference required to maintain constant flow of air into the furnace and to discharge the flue gases to the atmosphere through a chimney. Thus, boiler draught is one of the most essential systems of a thermal plant.
The total draught required to produce the current of air and to expel the flue gases is given as follows:
Total draught loss = Velocity head loss at the chimney exit + fuel bed resistance + head loss in equipments such as economizer, air heater, etc. + ...
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