Closing-to-wall air adding device on sidewall of opposed firing boiler

The utility model discloses a closing-to-wall air adding device on a sidewall of an opposed firing boiler. The device comprises the opposed firing boiler, a flue and a chimney at the tail end of the flue, an air preheater is arranged on the flue, a closing-to-wall air nozzle is arranged on a water wall of the sidewall of the opposed firing boiler, the inner end of the closing-to-wall air nozzle is blocked off, air blowing holes are arranged on the circumferential face of the inner end of the closing-to-wall air nozzle, and the outer end of the closing-to-wall air nozzle is connected with a secondary hot air pipeline of the preheater through a connecting hose. The closing-to-wall air adding device is simple in structure, convenient to implement, safe and reliable and is capable of effectively changing smoke compositions on the water wall of the sidewall of the opposed firing boiler, decreasing the temperature of the metal pipe wall in a corresponding area and preventing pulverized-coal particles from directly washing the wall, and accordingly requirements on high-temperature and reducible sulfur corrosion control of related portions are met, and normal firing of the boiler cannot be influenced.