the draft to be created

limitation of construction facilities

control of pollution

quantity of flue gases to be handled

boiler drum

superheater tubes

economiser

a separate coil located in convection path.

more

equal

less

could be more or less depending on the size of plant

desirable

economical

essential

uneconomical.

chimney

induced draft fan

both combined (a) and (b)

steam jet draught