On the basis of traditional lumped parameter model of the deaerator

a sectional model of the build-in type deaerater

including sub-models such as that in spraying section

mixed heat exchanger section

and the bubbling section

as well as the arrangement of steam flowing pipes in the deaerator

has been established

reflecting the influence of internal structure and working process

such as arrangement of steam flowing pipes and atomization using nozzles

upon the thermodynamic performance of the said deaerator.Taking the deaerator of one supercritical 600 MW unit as an example

the working situation of deaerator under different designed operating conditions have been simulated by using the sectional model and the non-sectional model respectively.Results show that the accuracy and stability of the sectional model are far higher than that of the traditional non-sectional model

being able to be used for analysing the thermodynamic behavior of deaerator.