Medicament powder injection system for treating household garbage incineration flue gas

The embodiment of the invention provides a medicament powder injection system for treating household garbage incineration flue gas. The medicament powder injection system comprises a supporting frame and an injection unit arranged on the supporting frame. The spraying unit comprises a storage tank, a material collecting barrel, a material taking pipe, a material taking screw, a driving mechanism, a material falling pipe, a guide part, a contraction part and a smoke pipe. According to the embodiment of the invention, during operation, the flow of medicament powder can be accurately controlled by controlling the rotating speed of the material taking screw, and a stable dilute phase conveying system is formed in the medicament powder injection system through the entrainment action of compressed air, so that the medicament powder is injected into the flue gas pipe and participates in flue gas purification reaction with incineration flue gas; the feeding amount of the medicament powder is accurate and controllable