The high load nitrogen oxide for the boiler it is low generation ba - na

摘要

PURPOSE:To form a thin film of annular flame at an outer periphery of a front plate by a method wherein a rear plate is arranged at an outer circumference near an extreme end of an inner tube, several secondary air injection holes are radially arranged in the rear plate and the front plate is arranged at an extreme end of the inner tube. CONSTITUTION:A rear plate 2 is arranged at an outer circumference near an extreme end of an inner tube 1, and several secondary air injection holes 3 are radially arranged. An combustion air is fed into a secondary air flow passage 10, a part of it is fed into the inner tube 1 through primary air injection holes 7. In turn, since combustion gas is being injected from gas injection holes 6, gas and primary air are being mixed and reach an extreme end of the inner tube 1 and injected from mixed gas injection holes 5. During this period, other portions of the secondary air is flowed in the secondary air flow passage 10, reach the secondary air injection holes 3 and then injected from there. A part of the secondary air strikes against the front plate 4 to form a limitless number of small eddy flows over an entire rear area of the front plate 4. Mixed gas is injected from the mixed gas injection holes 5 into the small eddy currents.