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Текст статьи не публикуется в открытом доступе в соответствии с политикой журнала.During combustion of fossil fuels a large amount of harmful substances aredischarged into the atmospheres of cities by industrial heating boiler houses. The most harmfulsubstances among them are nitrogen oxides. The paper presents one of the most effectivetechnological solutions for suppressing nitrogen oxides; it is arrangement of circulation processwith additional mounting of the nozzle directed into the bottom of the ash hopper. When brownhigh-moisture coals are burnt in the medium power boilers, generally fuel nitrogen oxides areproduced. It is possible to reduce their production by two ways: lowering the temperature in thecore of the torch or decreasing the excess-air factor in the boiler furnace. Proposed solutionincludes the arrangement of burning process with additional nozzle installed in the lower partof the ash hopper. Air supply from these nozzles creates vortex involving large unburned fuelparticles in multiple circulations. Thereby time of their staying in the combustion zone isprolonging. The findings describe the results of the proposed solution; and recommendationsfor the use of this technological method are given for other boilers

Reduction of Nitrogen Oxides Emissions from a Coal-Fired Boiler Unit