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Monitoring the formation of nitrogen oxides in the furnace of a steam boiler for protection of atmospheric air from pollution

Flaring of coals and, less often, peat is often used in boilers of industrial heat power engineering. High temperature of combustion products can be an indicator of the efficiency of boilers. But it can cause a high level of nitrogen oxides formation posing a threat of air pollution. Therefore, it is necessary to maintain a constant and stable temperature level to keep a certain level of nitrogen oxides formation. This paper presents a method for determining the temperature of combustion products using an Optris pyrometer with an operating wavelength of 4.24 μm in the CO 2 absorption band. For the different heights of the boiler furnace, the experimental dependences of the temperature of combustion products on the emissivity set on the pyrometer are obtained. The results of determining the temperature of combustion products in the furnace of BKZ-210-140F steam boiler during flaring of peat and coal are presented. Current control of the temperature level of combustion products allows to maintain the required environmentally safe level of nitrogen oxides formation.