Directiong against improper jointing point of returned cooling water from slag cooler of 2×300 MW units in Mengxi Power Plant

the decrease of integral cycle efficiency and its influence upon economic efficiency in operation of the units have been analysed

and an optimized improvement scheme being put forward on the basis of data obtained from results of analysis.Compared with the original units

a scheme

in which the returened cooling water from slag cooler is jointed into the inlet of low-pressure heater no.7

and all condensate being passed through the salg cooler and low-pressure heater no.7 in series has been adopted

the net coal consumption rate can be lowered by 1.25 g/(kw·h) and 1.67 g/(kw·h) under load of the unit being 292 MW and 202 MW respectively.In the event of returned cooling water being jointed into the inlet of low-pressure heater no.6

and all condensate being passed through the slag cooler and low-pressure heater no.7

the net coal consumption rate can be lowered by 0.83 g/(kw·h) and 1.22 g/(kw·h) under load of the unit being 292 MW and 202 MW respectively.