With the rapid development of economy and the increasingly serious problems of energy and environment, the development of alternative fuels and the control of pollutant emission have gradually become the new trend of burner design.Existing rotary kiln burners are generally designed to burn conventional fuels such as natural gas, fuel oil and coal.They not only consume large amounts of energy and cost, but also emit nitrogen oxides at a rate of 65 (t700 mg/m3).Currently, the ministry of environmental protection is studying new standards for nitrogen oxide emissions in the cement industry.The study includes 300 mg/m3 and 400 mg/m3, which is much stricter than the current 800 mg/m3.The existing burner technology cannot meet the requirements.Therefore, it is necessary to design a rotary kiln burner on the basis of existing technology to replace fuel with solid waste and reduce nitrogen oxide emissions to meet environmental requirements.
In order to solve the shortcomings of existing technologies, our company provides a new rotary kiln burner with reasonable structure design, convenient operation and strong environmental protection, which can use solid waste as an alternative fuel to effectively reduce the emission of nitrogen oxides in flue gas.Neodymium has important economic and social effects.Technical solution: to achieve the above goal, adopts the following technical scheme: replace the fuel of the rotary kiln burner with solid waste, including the burner in the shell, burner nozzle, is located in the burner axis current in pulverized coal, external tangential airway, channels, internal tangential air channels, central air, solid waste channel and oil gun.As the preferred scheme, the above rotary kiln burner that USES solid waste instead of fuel, the shaft flow air passage is located in the outermost shell of the burner, the wind direction is axial, and the injection speed is high, which is used to increase the inlet of secondary air into the furnace flame and increase the thrust of secondary air.The flame.There are four groups of rectangular end nozzles in the annular position of the axial flow passage, and each group has nine axial flow passage nozzles.As a preferred option, rotary kiln burners with solid waste as an alternative fuel are described above.The external tangential air passage is located at the second layer of the burner shell, and four groups of rectangular nozzles are set at the annular position of the external tangential air passage.As the preferred scheme, the above-mentioned rotary kiln burner that USES solid waste instead of fuel, the pulverized coal channel is located in the third layer of the burner shell, the inward-tangential air duct is located in the fourth layer, and the four groups of rectangular inward-tangential air duct nozzles are arranged in the annular position of the t-shaped tube.There are six inward-tangential nozzles in each group.As the preferred scheme, the rotary kiln burner that USES solid waste instead of fuel has four sets of tangential airway nozzles, a rectangular end face at the annular position of the external tangential airway, six external tangential airway nozzles in each group, and two nozzles in the middle of each group.External tangential air passage nozzles have end face areas of other nozzles.Half, can improve tangential wind speed, can breathe in more high temperature secondary wind, to get enough combustion power, better control the mixture and combustion of pulverized coal and solid waste, so as to make the combustion full.The combination of external and internal tangential winds of the rotary kiln burner with solid waste (other than the fuel described above) keeps the unburned fuel in the inner circulation area of the flame.The concentration of reducing agent in this area is helpful to control solid waste fuel and nitrogen oxides and effectively reduce the emission of nitrogen oxides in flue gas.As the preferred solution, the rotary kiln burner can substitute solid waste for fuel nozzle through axial air channels and external tangential nozzle air channel and internal tangential nozzle air passage staggered, to ensure that the contact area of the flame and the secondary air, ensure that fire not deformation, is beneficial to the wind and the mixture of solid waste fuel, improve combustion rate.As the preferred option, the tangential wind direction of the air passage.
