Subcritical coal-fired boiler full-load denitration system

The invention discloses a subcritical coal-fired boiler full-load denitration system which comprises a flue gas pipeline, and a denitration structure is installed in the flue gas pipeline. The denitration structure comprises a coal economizer, an SCR denitration device, a motor, a gear, two sliding rails, a rotary spraying disc, a gear ring, a containing groove, a conveying pipe, a plurality of discharging heads, a circulating assembly, a water supply assembly and a steam assembly. The subcritical coal-fired boiler full-load denitration system has the beneficial effects that according to the denitration structure, flue gas generated by a boiler enters the coal economizer, the water supply assembly is heated through the built-in coal economizer, the flue gas is subjected to denitration treatment through the SCR denitration device installed in the flue gas pipeline, the driving motor works, and the motor drives the gear to rotate slowly, therefore, the rotary spraying disc is driven to rotate in the two sliding