Efficient coal dust combustor for reducing smoke NOx content

The invention relates to coal dust combustion technology and particularly relates to an efficient coal dust combustor for reducing smoke NOx content. The invention solves the problem that the existing grading air supply coal dust combustor cannot be applied to small and medium coal dust boilers. The efficient coal dust combustor comprises a primary air pipe, wherein an inner cavity of the primary air pipe forms a primary air channel; the outer side of the primary air pipe is coaxially sleeved with an air mixing sleeve; the inlet end of the air mixing sleeve is communicated with an air mixing inlet pipe; the air outlet end of the air mixing sleeve is provided with an air mixing expansion section; the inner wall of the air mixing sleeve and the outer wall of the primary air pipe jointly encircle an annular air mixing channel; the outer side of the air mixing sleeve is coaxially sleeved with an inner secondary air sleeve; and the inlet end of the inner secondary air inlet is communicated with an inner secondary air inlet pipe. Based on a brand-new structure, the efficient coal dust combustor disclosed by the invention effectively solves the problem that the existing grading air supply coal dust combustor cannot be applied to the small and medium coal dust boilers; in addition, the efficient coal dust combustor can be applied to the small and medium coal dust boilers.