Air and flue gas mixing device

The utility model provides an air and flue gas mixing device, and belongs to the technical field of boilers. The problem that noise is too large due to the fact that an existing boiler is insufficientin stability during operation is solved. The air and flue gas mixing device is arranged on a heating boiler, the injection and suction mixing device comprises a flue gas taking device and an injection and suction mixer, one end of an FGR gas return passage is connected with a flue gas exhaust passage through the flue gas taking device, the other end of the FGR gas return passage is connected witha boiler body, and the injection and suction mixer is arranged on the FGR gas return passage and connected with an air pipeline. The method is carried out at an FGR flue gas extraction point and an FGR mixing point; the smoke taking device and the injection and suction mixing device are respectively arranged, so that the phenomenon of air pressure vibration caused in the process of adjusting FGRsmoke through the air baffle and the FGR smoke baffle can be avoided, the FGR smoke can be guided and smoothly mixed into air, and the phenomenon of air pressure fluctuation caused by high or low airpressure is avoided. 本实用新型提供了一种空气烟气混合装置，属于锅炉技术领域。它解决了现有锅炉运行时稳定性不足而导致噪声过大的的问题。本空气烟气混合装置，设置在采暖锅炉上，射吸混合装置包括取烟器和射吸混合器，FGR回气通路的一端与通过取烟器与烟气排放通路相连，另一端与锅炉本体相连，射吸混合器设置在FGR回气通路上，且射吸混合器与空气管路相连接。它在FGR烟气抽取点和FGR混入点，分别设置取烟装置和射吸混合装置，这样的设计可以避免FGR烟气通过空气挡板和FGR烟气挡板调节过程中引起的气压震动现象，能够对FGR烟气进行引流并使其顺利混入空气中，不至于空气压或髙或低，造成气压波动现象。