The SCR intelligent ammonia injection zone control system improves the uniformity of NOx concentration distribution at the SCR outlet by controlling the ammonia injection amount in zones, avoiding local ammonia under injection or over injection at the SCR inlet. While meeting the requirements of ultra-low NOx emission standards, it reduces ammonia escape rate, alleviates corrosion and ash accumulation problems of boiler tail equipment, and extends the life of denitrification catalysts. The specific implementation method is to add a zone leveling valve (pneumatic or electric adjustment) and a zone ammonia flow meter between the total control valve and the branch control valve of the traditional ammonia injection pipeline, and to patrol the NOx/O2 concentration (temperature optional) distribution value at the SCR outlet. The control system calculates the deviation percentage of ammonia flow rate in each zone at the SCR inlet as the control target value, and closed-loop adjusts the zone leveling valve to make the measured flow rate change percentage of the zone ammonia flow meter consistent with the control target value.

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