This paper introduces the process of the ultra-low emission renovation of the 300MW subcritical unit which has been in service for many years in a thermal power plant.From the perspective of the major of thermal control,the whole-process dynamic adjustment and optimization of the control mode and logic of the subsequent operation of the newly-added ultra-low emission equipment have been implemented.Through continuous improvement of the con-trol logic,the requirements of environmental protection for realizing the operation with ultra-low emission of the sub-critical coal-fired unit have been finally met,which provides reference for same types of units.
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