Primary air control system of thermal power station

The utility model relates to the field of primary air, in particular to a primary air control system of a thermal power station. The device comprises a hot-air pipeline and a cold-air pipeline, the hot air pipeline is connected with the preheating device; an air mixing device communicated with the cold air pipeline is arranged in the hot air pipeline; the air mixing device comprises an air mixing pipeline spirally arranged in the hot air conveying direction. And air outlets are formed in the air mixing pipeline at intervals. The technical scheme has the beneficial effects that cold air and hot air are fully mixed through the air mixing device arranged in the hot air pipeline, and the situation that the flow field of mixed air, including speed and temperature distribution, is not uniform before the pulverized coal enters a mill is avoided, so that the burning efficiency of the pulverized coal is improved. 本实用新型涉及一次风领域，具体为一种火电站一次风控制系统。它包括热风管道与冷风管道；热风管道与预热装置相连；热风管道内设置有与冷风管道相连通的混风装置；混风装置包括沿热风运输方向螺旋设置的混风管道；混风管道上间隔