旋风筒阻力特性机理(英文)

MECHANISIM OF RESISTANCE CHARACTERISTICS IN CYCLONE

水泥窑尾预热器的旋风筒研究开发主要考虑提高气固分离效率和减小阻力,且后者更重要。通过采用计算流体动力学的方法模拟和计算了旋风筒的阻力特性,其结果与实际运行有很好的一致性。从旋风预热器的压损机理研究出发,把旋风筒的压损分为有效能和无效能,提出了旋风预热器的阻力特性计算方法,并在已投产的生产线上得到了验证。计算结果表明,与常规型旋风筒相比,大蜗壳型旋风筒的有效能高,其能量利用率高,具有节能和减小阻力的优点,应当在水泥熟料烧成系统中推广应用。

In the design and construction of a cyclone used for cement production, the reduction of resistance and the increase of separation efficiency should be considered. Much attention was mainly paid to the reduction of pressure loss. The pressure loss was calculated by the computational fluid dynamics with Reynolds stress model, showing a good accordance with the experimental data. By analyzing the mechanism of pressure loss, the pressure loss of a cyclone can be divided into the effective energy loss and the non-effective energy loss. A method to calculate the cyclone resistance is proposed and verified in practice. The results show that the pressure loss in a cyclone depends mainly on its structure and the operating parameters. A higher energy efficiency was obtained for a cyclone with a larger volute, compared to that of a conventional one. Since the cyclone with a larger volute has some advantages such as energy-saving and resistance-reducing, it could be thus used in the cement clinker burning system.