Full-load denitration device with urea fume pyrolysis function

The invention discloses a full-load denitration device with a urea fume pyrolysis function and relates to the technical field of boilers. Key techniques of 'urea fume pyrolysis' and 'full-load denitration' are adopted, the device comprises equipment such as a boiler tail flue transferring chamber, a bypass flue, a bypass flue adjusting door, an expansion joint, a closing door, a urea solution metering and allocation device, a urea solution spray gun, an ammonia gas flow equalizing device and a main flue adjusting door, a fume bypass is arranged above a low-temperature overheater in the boilertail flue transferring chamber, an ammonia ejection device and a structure similar to a boiler partition wall are arranged inside the bypass flue, and full-load denitration and urea fume pyrolysis ofa boiler can be carried out. Electric energy and other fuel energy required by urea pyrolysis can be replaced. By adopting the device, equipment such as a urea pyrolysis furnace, a diluted air-power heater or a fuel oil/gas flue heater and an ammonia spraying grid of the prior art can be replaced, and the device is simple and smart in structure, and stable and reliable in effect.