1. The low-nitrogen burner for rotary kilns mainly consists of pipelines, nozzles, metallic bellows compensators, butterfly valves, pressure measuring instruments, and a protective layer. 。

　　● Pipelines: From the outside to the inside, these are the axial flow channel, coal-air channel, swirl flow channel, central air channel, and fuel oil pipe. Since the fuel oil pipe is only used for ignition, it is customarily called a four-channel system.

　　● Nozzles: Processed from special materials, the outlet area of the swirl flow can be adjusted, thereby adjusting the ejection speed and air volume of the swirl flow. The entire nozzle is a key component in ensuring the flame shape.

　　● Swirl flow bellows compensator: This is the main component connecting the inner and outer pipelines of the swirl flow, sealing, and adjusting the flame shape.

　　● Butterfly valve: Used to adjust the air volume.

　　● Pressure measuring instrument: Indirectly displays the ejection speed of the burner's air outlet.

　　● Protective layer: That is, the refractory castable layer, which withstands high temperatures of 1300-1700℃.

　　2. Head structure and working principle:

　　Coal powder is carried by airflow from the coal-air pipe and ejected outwards at a certain diffusion angle. The adjacent auxiliary air gives it considerable momentum and angular momentum. The inner swirl flow mixes with the ejected coal powder airflow and advances spirally at high speed, meeting the high-speed ejected axial airflow. The insertion of the axial airflow further enhances the mixing of coal and air (including the surrounding secondary air) and can adjust the divergence of the flame, allowing adjustment of the flame's length and thickness as needed to achieve the desired flame shape.

　　The role of the central air is to promote the combustion of a small amount of coal powder and CO in the central part, making the combustion more complete and playing a stabilizing role. Due to this combustion mechanism and the high speed of the swirl flow and axial flow, the combustion is very rapid and complete.

　　3. Performance characteristics of the rotary kiln burner:

　　● Reasonable structural design, convenient flame adjustment. In addition to adjusting the air volume of the draft flow and swirl flow, the outlet area of the swirl flow can also be adjusted to change the wind speed at the burner outlet, ensuring normal fuel combustion.

　　● All air ducts of the burner use flange connections, making them easy to disassemble and maintain.

　　● The nozzle material is easy to replace.

　　● Reduce CO and NOx content: Because the auxiliary air and coal powder are mixed more thoroughly and the combustion is faster and more complete, the content of CO and NOx in the kiln tail exhaust gas is reduced, which is beneficial to the operation of the electrostatic precipitator.

　　Zhongwei Company designs burners for mixed combustion of coal powder and other fuels, including coal gas mixed combustion, coal oil mixed combustion, rice husk and gas mixed combustion, and rice husk and coal powder mixed combustion multi-channel burners.

Zhongwei Company designs pulverized coal and other fuel mixed combustion burners, including coal gas co-firing, coal oil co-firing, rice husk and gas co-firing, and rice husk and pulverized coal co-firing multi-channel burners.