STUDY OF THE HEAT TRANSFERIN THE SUPERHEATER REGION OF BOILE,R

Abstract

The superhcater zone of the boiler is the convective heat transfer region of the boiler, that is the heat in this region mostly transferred by the convection between the flew gases outside and steam inside tubes. The factors that effected the heat transfer rate and heat transfer coefficient in the Mosiab power station boiler (980000kgihr capacity under pressure of 175bar) at its superlieater is studied here. The super heater is divided into two parts, primary and secondary super heater. Each part is
divided into many zones depending on the pipe size and material. The effect of boiler load mass flow rate of steam on the heat transfer rate, heat transfer coefficient, steam temperature is studied. It is concluded that as the load on the boiler increased the heat transfer rate is also increased and the heat transfer coefficient. The heat transfer coefficient in secondary superheater is less that that in the primary. The reduction in mass flow rate of steam increases the wall temperature of tubes because of low capacity of water to receive heat.