The 2×300MW units in Shaoguang Power Plant was enlarged to 2×600MW units

but the original boiler make-up water treatment system with total ion change can not satisfy the requirement of newly built units.Therefore

the integrated membrane boiler make-up water treatment technology combined with ultra-filtration(UF)

reverse osmosis(RO)and electrodeionization(EDI)technologies was applied.The technological process and major equipments of this water treatment system were presented

and the operation cost was analyzed.The practical application indicated that

the conductivity of the effluent from the integrated membrane water treatment system was lower than 0.15μS/cm

and the SiO2content in that was below 10g/L

which met the needs of the boiler make-up water quality;the water preparation cost was 2.69yuan/t

about 0.11 yuan/t lower than that of the original system;this new system also saved energy

occupied small area

be friendly to the environment and simple operation.