Control method and device for spraying denitration reducing agent

The embodiment of the invention provides a control method and system for spraying a denitration reducing agent. The method comprises the steps that flue gas detection data of flue gas input at a flue gas inlet are obtained based on a flue gas detection device; based on the flue gas detection data, a motor rotating speed adjusting value and/or a valve opening adjusting value of a reducing agent injection dosage device are/is determined; and adjusting the reducing agent injection dosage device based on the motor rotating speed adjusting value and/or the valve opening adjusting value. 本说明书实施例提供一种喷射脱硝还原剂的控制方法及系统，该方法包括：基于烟气检测装置获取入烟口处输入烟气的烟气检测数据；基于烟气检测数据，确定还原剂喷射剂量装置的电机转速调节值和/或阀门开度调节值；以及基于电机转速调节值和/或阀门开度调节值，对还原剂喷射剂量装置进行调节。