Injection device for selective non-catalytic reduction denitration

The utility model discloses an injection device for selective non-catalytic reduction denitration, and relates to a flue gas purification denitration device; the injection device comprises a spray gun provided with a compressed air channel and a urea solution channel, and a compressed air pipeline and a urea solution pipeline which are respectively communicated with the spray gun; the urea solution pipeline comprises a urea water solution storage tank, a first filter group, a urea solution pump, a static mixer and a second filter group which are sequentially communicated by a pipeline; an inlet end of the static mixer is also communicated and provided with a dilution water pipeline provided with a dilution water pump; the compressed air pipeline comprises a compressed air source, a compressed air buffer tank and a third filter group which are sequentially communicated by a pipeline; and outlet pipelines of the second filter group and the third filter group are communicated with the spray gun. The injection device is high in denitration efficiency, more reliable in running and simple and easy to maintain.