desirable

economical

essential

uneconomical.

chimney

induced draft fan

both combined (a) and (b)

steam jet draught

entropy

enthalpy

pressure

temperature

infinitely long

around 200 meters

equal to the height of the hot gas column producing draught

outside temperature is very low

carbon, hydrogen, nitrogen, sulphur, moisture

fixed carbon, ash, volatile matter, moisture

higher calorific value

lower calorific value