Dispersion characteristics of the plug flow hazardous waste by multiple gas jets

In cement kilns co-processing hazardous solid wastes, the material is transported to the calciner for incineration via pipelines. When the viscous material enters the calciner in the form of plug flow, the CO and NO_x emitted by the cement kiln fluctuate greatly as a result of insufficient combustion. In order to improve the dispersion of materials, avoid accumulation and make the combustion more sufficient, an experimental system was established to study the influence of nozzle system i, distance d, and pushing speed v on the dispersion characteristics.The slump test showed that the material with a sludge mass fraction of 35   40% had good fluidity. Moreover, the shape of the dispersion area was V-shape when the dispersion length was less than 4   6 m and became a rectangle when the dispersion length was more than 6 m. Finally, the results showed that i = 3 yielded the best effect, followed by i = 5, and i = 2 had the worst effect. In addition, d = 160 mm yielded the best effect, followed by d = 240 mm, and d = 80 mm had the worst effect. As the pushing speed v increased, the dispersion effect gradually worsened. The material that was 2 m away from the spray gun accounted for about 50% of the total.Implications: In this paper, a method based on multiple gas jets atomization of hazardous waste is proposed and verified. This method can atomize the plug hazardous waste into granules, which not only improves the combustion efficiency of hazardous waste, but also reduces the fluctuation of CO. We believe that this method can be widely used in industry to increase the output of cement kiln collaborative disposal of hazardous waste.