Partitioned precise ammonia spraying device for denitration system of thermal power plant

The utility model discloses a partition precise ammonia spraying device for a denitration system of a thermal power plant. According to the main technical scheme, the partition precise ammonia spraying device comprises a boiler; the economizer is connected with the boiler; the SCR reactor is connected with the economizer through a first flue; the ammonia spraying device comprises an ammonia gas supply device, an ammonia spraying total amount control and regulation device connected with the ammonia gas supply device, and two ammonia spraying grids which are connected with the ammonia spraying total amount control and regulation device through a first control and regulation valve and are respectively mounted on two sides in the first flue; the air preheater is connected with the SCR reactor through a second flue; an ammonia nitrogen rapid measuring device; an ammonia escape online monitoring device; according to the partition multi-point synchronous measuring device, two first measuring points are arranged on e