HEAT-RECOVERY FROM THE STARTING VESSEL OF A ONCE-THROUGH BOILER SYSTEM

An increasing number of coal-and oil-fired boilers are employed in cov ering the week-day load and are shut down at weekends. This paper desc ribes an attempt to calculate the amount of heat recovery in a once-th rough boiler system during its start-up. A mathematical model has been firstly developed, and an experimental study is carried out to check the model. The 300 MW once-through boiler system is taken as an exampl e. Both theoretical analysis and an experimental study show that the c apacity for heat recovery in the deaerator tank largely depends on the working pressure of the deaerator tank and the starting vessel. The v olume of the deaerator tank, especially the volume of water, has a lar ge effect on the heat recovery capacity. (C) 1997 Published by Elsevie r Science Ltd.