Method and equipment for reducing nitrogen oxide emission in yellow phosphorus tail gas combustion

The invention discloses a method and equipment for reducing nitrogen oxide emission in yellow phosphorus tail gas combustion. The equipment comprises a boiler, a tail gas purification device and a urea spraying device, wherein the boiler is a two-section boiler and is divided into a first combustion chamber and a second combustion chamber, the first combustion chamber is connected with the secondcombustion chamber, the first combustion chamber is connected with a tail gas inlet pipe, the other end of the tail gas inlet pipe is connected with the tail gas purification device, the excess air coefficient of the first-section combustion furnace is controlled to be smaller than 1, generation of nitrogen oxides is reduced, combusted tail gas enters the second combustion furnace to be further combusted, the urea spraying device is arranged in the second combustion furnace and reacts with the nitrogen oxides generated in the tail gas, and finally harmless nitrogen is generated. The boiler canreduce generation of the