Through comparison of different connecting schemes in retrofitting water side system of low-pressure economizer

the influence of each connecting scheme upon the economic efficiency of unit has been obtained.Analysis shows that the economic efficiency of commonly used connecting scheme

i.e.the water supply of low-pressure economizer being taken from outlet of the final-stage low-pressure heater

and returning water to the deaeratori is the lowest

and then the feasibility of other connecting schemes has been analysed

and the most economic and feasible scheme being choised.