Abstract: As the core equipment of cement firing system, the performance of cement rotary kiln burner has an important impact on cement production efficiency and quality. However, due to the difficulty of comprehensively measuring the high-temperature and complex reaction process in the rotary kiln, the evaluation of burner performance often relies on experience and lacks theoretical guidance. To this end, computational fluid dynamics (CFD) is used to simulate the combustion process of pulverized coal to optimize the burner of cement rotary kiln. The optimization simulation results show that with the increase of axial wind velocity within a reasonable range, the gas phase temperature increases significantly, the high temperature region expands, the oxygen consumption rate increases, the mass fraction of carbon monoxide decreases, and the combustion efficiency is improved. The increase of swirl flow wind velocity has little effect on the temperature field, but it can significantly improve the mixing effect of pulverized coal and air and promote combustion. On this basis, the performance of the burner is optimized by increasing the axial flow wind velocity and swirl flow wind velocity, which improves the temperature field and component field distribution in the kiln, and affects the clinker mineral composition, in which the content of C3S and C4AF increase, and the content of C2S and C3A decrease, which has a positive impact on the performance of cement. In conclusion, the effects of axial flow wind velocity and swirl flow wind velocity on the performance of cement rotary kiln burner are deeply analyzed by numerical simulation method, which provides theoretical support for the optimal design of the burner, and the proposed burner optimization scheme effectively improves the distribution of temperature field and species field in the kiln, and improve the combustion efficiency and clinker quality of the fuel.

Key words: cement rotary kiln, four-channel pulverized coal burner, coal combustion, numerical simulation

摘要： 水泥回转窑燃烧器作为水泥烧成系统的核心装备，其性能对水泥生产效率和质量具有重要影响。由于回转窑内部的高温复杂反应过程难以全面测量，燃烧器性能的评估往往依赖于经验，缺乏理论指导。为此，本研究通过计算流体力学(CFD)对煤粉燃烧过程进行模拟，以实现水泥回转窑燃烧器的优化。模拟结果表明，随着轴流风速在合理范围内增加，气相温度显著升高，高温区域扩大，氧气消耗速率增大，二氧化碳生成速率增大，一氧化碳质量分数降低，燃烧效率提高。旋流风速增加对温度场影响相对较小，但能显著改善煤粉与空气的混合效果，促进燃烧。以此为基础，通过增大轴流风速和旋流风速对燃烧器性能进行优化，优化结果改善了窑内的温度场和组分场，影响了熟料矿物成分，其中C3S和C4AF含量增加，C2S和C3A含量减少，对水泥性能产生积极影响。本工作通过数值模拟方法深入分析了轴流风速、旋流风速对水泥回转窑燃烧器性能的影响，为燃烧器的优化设计提供了理论支持，提出的燃烧器优化方案有效改善了窑内温度场和组分场的分布，提高了燃料的燃烧效率和熟料质量。

关键词: 水泥回转窑, 四通道煤粉燃烧器, 煤燃烧, 数值模拟