Cement kiln pulverized coal burners: kiln-head burner, decomposition furnace burner
2026-05-08
It is used to provide high temperatures (flame temperature of 1600–1800°C), thereby facilitating the complete formation of the final silicate minerals. Another type consists of multiple coal-injection nozzles installed in the decomposition furnace, through which pulverized coal is conveyed into the furnace under high-pressure air and comes into contact with the fresh air inside, where it combusts to generate heat and supply substantial thermal energy to the feed material, enabling the decomposition of carbonate minerals—the primary raw materials for cement clinker.
What we would like to discuss here is the use of multi-airflow burners at the kiln head.
1. Burner positioning: Many companies use the “light-column method” for burner positioning, which offers precise control but is inconvenient to operate. It is preferable to use a position scale to locate the burner on the kiln-head cross-section; generally, setting the position slightly to the right of the X-axis or slightly in the fourth quadrant of the kiln-head cross-section yields better results. Under special process conditions, minor fine adjustments may be made. (This adjustment assumes a clockwise kiln rotation; the opposite—counterclockwise rotation—requires a different approach.)
2. Influence of Flame Shape on Calcination: The optimal flame shape in burner design is achieved when the axial and swirl air streams intersect at the (0.0) position—where the airflow rates in all air passages are maximized—resulting in a complete and robust flame.
Adjusting the flame shape is achieved by modifying the cross-sectional areas of the air passages. At the (0.0) position, the cross-sectional areas for both axial and swirl airflow are at their maximum. The flame shape results from the mutual interaction and mutual restraint between the swirl and axial flows, while its stability is maintained by the central air flow. The volume of the central air flow must be neither too high nor too low; ideally, its pressure should be kept within the range of 6–8 kPa, with the swirl airflow at 24–26 kPa and the axial airflow at 23–25 kPa, provided that the cross-sectional area of each air passage remains no less than 90% of its nominal value. To achieve changes in the flame shape, a stable primary-air outlet pressure is essential; by stabilizing the pressure at the burner and adjusting the cross-sectional areas of the individual branch ducts, the desired modification of the flame shape can be attained.
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Address: No. 118, Fengqing Road, Jinshui District, Zhengzhou City
Tel:+86-371-60960056
Mobile:+8613849187223
Email:zhongweigongyelu@126.com
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