Abstract: The poor and unstable effects of resins separation and transportation for the mixed bed(MB) polisher due to the lack of effective monitoring have greatly affected the operation of the MB polisher. An intelligent monitoring instrument of resins separation and transportation (IRIC) is therefore developed to solve this problem. This instrument is able to not only accurately inspect the terminal point of resins separation and transportation, improving separation effect of exhausted resins, but also adjust a ratio of cation to anion resins depending on the requirement to increase the periodic water production of the MB polisher. In 2014, IRIC was applied to the condensate polishing system in the 2×350-MW supercritical coal-fired units in Hainan. The operational reliability of the MB polisher has been highly improved, with the periodic water production being increased from 26 000 m3 to 82 000 m3 times of resins regeneration have been significantly decreased, saving 112 tons of acid and base, 31 000 m3 of demineralized water and 62 000 m3 of fresh water; annual supplemental resins have been decreased by 3%, producing an annual direct benefit of about 1.1 million RMB.

Key words: power plant, condensate polishing, mixed bed polisher, resins separation and transportation, resins separation percentage, intelligent monitoring