Design of low-NOx burner for coal-fired lime rotary kiln

Lime rotary kilns are widely used in the industrial calcination of quicklime. However, coal-fired rotary kilns, while ensuring output, also emit a large amount of NO_x, which causes significant environmental pollution. It is imperative to promote NO_x emission reduction in coal-fired rotary kilns. Based on the production parameters of a rotary kiln at an enterprise, a new low-NOx burner suitable for coal-fired rotary kilns was designed. The burner reduces NO_x emissions by enhancing air and fuel mixing to avoid localized high temperatures. The technical parameters and structural parameters of the burner have been calculated in detail. The design dimensions of the primary coal grinding channel, central air channel, secondary coal grinding channel, swirling air channel, and axial air channel are 108*4mm, 133*4mm, 219*5mm, 345*6.5mm, and 325*7mm, respectively. This work provides theoretical guidance for the processing and use of low-NO_x burners.