Patent ID: 8950345
Filing Date: 2015-02-10
Classification: F23C,F23D

Abstract:
1. A pulverized coal burner, comprising a primary air cylinder and a pulverized coal concentration device; wherein the pulverized coal concentration device enables the concentration of the pulverized coal flow to gradually increase from outside to inside along the radial direction, with respect to an axis of the primary air cylinder, characterized in that it further comprises a pulverized coal separating cylinder and a pulverized coal guiding cylinder located in the primary air cylinder and downstream of the pulverized coal concentration device, wherein the downstream end of the pulverized coal separating cylinder is connected with the upstream end of the pulverized coal guiding cylinder, and an outlet of the pulverized coal guiding cylinder has a conical expansion portion; and it further comprises a divergent nozzle which is connected with the downstream end of the primary air cylinder and which has a cross-sectional area gradually increasing along the flow direction of the pulverized coal flow, and the expansion angle of the divergent nozzle is not smaller than the expansion angle of the pulverized coal guiding cylinder.