Urea pyrolysis ammonia preparation energy saving device for boiler smoke denitrification

The invention discloses a urea pyrolysis ammonia preparation energy saving device for boiler smoke denitrification. The device comprises a boiler high-temperature reheater communicated through a pipe, a smoke-air heat exchanger, an air preheater and a urea pyrolysis furnace; high-temperature smoke of the boiler high-temperature reheater enters the smoke-air heat exchanger through the pipe to exchange heat with air for cooling to enter an inlet flue of the air preheater; and low-temperature air led out from an outlet of the air preheater enters the smoke-air heat exchanger through the pipe to exchange heat with smoke for heating to enter the urea pyrolysis furnace through the pipe. The device uses the smoke heat in the boiler as a urea pyrolysis heat source, is safe, simple, practical and reliable, and is high in economic value and largely reduces operation cost. 本发明公开一种用于锅炉烟气脱硝的尿素热解制氨节能装置,包括通过管道连通的锅炉高温再热器、烟气?空气换热器、空气预热器和尿素热解炉，从锅炉高温再热器后的高温烟气通过管道进入烟气?空气换热器与空气进行热交换降温后进入空气预热器的入口烟道；从空气预热器出口引出的低温空气通过管道进入烟气?空气换热器与烟气