Modifying structure for reducing heat primary air flue resistance of direct-blowing type coal pulverizing system

The invention discloses a modifying structure for reducing heat primary air flue resistance of a direct-blowing type coal pulverizing system. The modifying structure comprises a circular pipeline, a conveying pipeline, an air preheater, a circular heat primary air contact mother tube, a coal mill and a connecting pipeline, wherein one end of the circular pipeline and one end of the conveying pipeline communicate with a heat primary air outlet of the air preheater; the other end of the circular pipeline and the other end of the conveying pipeline communicates with the circular heat primary aircontact mother tube; and the coal mill is connected to the circular heat primary air contact mother tube through the connecting pipeline. The modifying structure can effectively reduce resistance of the coal pulverizing system. 本发明公开了一种降低直吹式制粉系统热一次风道阻力的改造结构，包括圆形管道、输送管道、空气预热器、圆形热一次风联络母管、磨煤机及连接管道；圆形管道的一端及输送管道的一端与空气预热器的热一次风出口相连通，圆形管道的另一端及输送管道的另一端与圆形热一次风联络母管相连通，磨煤机经连接管道与圆形热一次风联络母管相连接，该改造结构能够有效的降低制粉系统的阻力。