Straight-flow pulverized coal burner

The invention discloses a straight-flow pulverized coal burner. The straight-flow pulverized coal burner comprises a shell, a pulverized coal concentrator, a rich pulverized coal primary air pipe connected with a rich pulverized coal outlet of the pulverized coal concentrator, a lean pulverized coal primary air pipe arranged around part of the circumference of the concentrated pulverized coal primary air pipe and a secondary air pipe. The secondary air pipe and the thin pulverized coal primary air pipe are arranged oppositely at the periphery and arranged around the rest part of the circumference of the rich pulverized coal primary air pipe. The secondary air pipe is located on the backfire side of the rich pulverized coal primary air pipe. The nozzle end of the rich pulverized coal primary air pipe and the nozzle end of the lean pulverized coal primary air pipe are arranged in a spaced mode in the radial direction. The nozzle end of the rich pulverized coal primary air pipe and the nozzle end of the lean pulverized coal primary air pipe are both located behind the nozzle end of the secondary air pipe in the axial direction. The straight-flow pulverized coal burner can substantially improve the stable combustion capacity, the combustion efficiency and the anti-coking capacity, resolve the conflict between ignition stable combustion and flame underscouring capacity, can also reduce emissions of NOx, has the advantage of the wide coal quality application range and meets the requirements of boilers for deep peak regulation and fault coal combustion.