Heat Transfer Engineering, Vol.39, No.13-14, 1217-1226, 2018
Optimum Heating of Boiler Evaporator
To speed up the boiler start-up, especially from the cold state, the boiler evaporator may be flooded with hot water at the beginning of the process. The temperature of water supplied to the boiler evaporator through lower chambers of the boiler furnace chamber waterwalls will be found from the condition of equality between allowable stresses and circumferential thermal stresses on the edge of the opening for the downcomer. A mathematical model of the evaporator hot-water heating with distributed parameters is presented. The hot water needed to fill the boiler evaporator may be supplied from the feed water tank of another operating boiler or a separate hot water tank.