coking coal

non coking or free burning coal

pulverised coal

high sulphur coal

heating takes place at bottom and the water supplied at bottom gets converted into the mixture of steam bubbles and hot water which rise to drum

water is supplied in durm and through down-comers located in atmospheric conditon it passes to the water wall and rises to drum in the form of mixture of water and steam

feed pump is employed to supplement natural circulation in water wall type furnace

water is converted into steam in one . pass without any recirculation

atmospheric temperature

500-600°C

70O-850°C

95O-1100°C

cement industry

thermal power plant

blast furnace

domestic use

cornish is fire tube and lancashire is water tube

cornish is water tube and lancashire is fire tube

cornish has two fire tubes and lancashire has one

lancashire has two fire tubes and cornish has one