Reducing agent uniform distribution and distribution injection system for natural gas flue gas denitration reactor

The utility model relates to a reducing agent uniform distribution and distribution injection system for a natural gas flue gas denitration reactor, which comprises a front flue, a middle flue and a rear flue, a plurality of catalyst layers are arranged in the middle flue, at least one group of injection positions I is arranged in the front flue, and at least one group of injection positions II is arranged between adjacent catalyst layers. Each group of injection positions I comprises a flue body, a reducing agent inlet pipe, a front annular main pipe, a reducing position, a rear annular main pipe, an injection pipe and a control valve are arranged outside the flue body, the front annular main pipe and the rear annular main pipe are connected through the reducing position, and the reducing agent inlet pipe is arranged on the front annular main pipe; at least two injection pipes are evenly arranged on the front annular main pipe and the rear annular main pipe, a control valve is arranged on each injection pipe