In a plant's 2×1,000MW ultra-supercritical units,oxygenation treatment(OT)is applied to the boil-er feedwater.Based on the diagnosis on polishing high-speed mixed bed and regeneration system by utilizing the Specialized System for Diagnosis and Optimization of Operation Performance of High-speed Mixed Beds in Thermal Power Plants developed by Xi'an Thermal Power Research Institute Co.,Ltd.,problems such as lack of intelligent monitoring device for ion leakage and regeneration system,and large consumption of acids and bases in regeneration at the later phase of operation were identified.After the retrofit with instrument of image recognition and intelligent control of resin transportation(IRIC)and double-layer perforated plate water distributor,the external regeneration of resins was put under intelligent control,the accuracy in recognition of resin transportation endpoints reached up to 100%,average water produced per cycle of high-speed mixed bed increased by 108%,and content of Na+ and Cl-in effluents was superior to that required in the Quality Criterion of Water and steam for power plant and Steam-generating Equipment(GB/T12145-2016),with signif-icant improvement in economic and safety benefits.
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