Boiler denitration device

The invention discloses a boiler denitration device. An injection system comprises an injection pipe, wherein the injection pipe is arranged in the boiler wall of a boiler and located at the lower portion of a conveying belt, and a blind plate is arranged at the end, close to the outside of the boiler wall, of the injection pipe. An ammonium water vaporization system comprises a gasification tank provided with an interlayer, wherein the gasification tank is connected with the boiler through a delivery pipe, the conveying belt connected with the outside is arranged in the middle of the boiler, multiple groups of gasification injection pipes are arranged at the upper portion of the boiler, baffles are arranged at the contact position between the gasification injection pipes and the outside of the boiler wall, sealing plates are arranged at the tail ends of the gasification injection pipes, the tail ends of the gasification injection pipes penetrate through the boiler to be arranged at the upper portion of the inside of a boiler cavity, the gasification injection pipes outside a boiler body are mutually connected by using flanges and are connected with the delivery pipe, and one side of the boiler is connected into the interlayer through a waste heat recovery device. The boiler denitration device is simple in structure, convenient to operate and capable of efficiently performing denitration and uniform injection, decreases ammonia gas escape, avoids the direct contact between ammonia water and a product and can reasonably utilize waste heat resources while improving the product quality.