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热变形是回转式预热器的关键技术问题。受热后回转式预热器的各部件都要产生热变形,因此,一个完整的密封系统应针对各部件的热变形特点进行设计。本文从大直径(φ9.5米)转子转预热器密封结构改进前后的运行实践出发,阐述了掌握热变形规律的重要性,该预热器原设计时未考虑上横梁的热变形,在试运行中暴露了一些问题,经过调查和测量,掌握了上横梁的热变形规律,对该预热器密封系统作了局部改进,并重新确定冷态预留密封间隙,和充分利用上横梁的热变形来吻合转子的热态蘑菇形曲面。该预热器经局部改进后,漏风系数为:△α甲=0.072,△α乙=0.084,折算成(美国ASME标准)漏风率为:A甲=0.051,A乙=0.06,密封性能达到国际先进水平。该预热器上横梁结构与英国豪登公司一致,其热变形规律对预热器的密封设计有一定的参考价值。
Thermal deformation is the key technical issue of rotary preheater. After heating the components of the rotary preheater are to produce thermal deformation, therefore, a complete sealing system should be designed for the thermal deformation characteristics of the various components. In this paper, starting from the operation practice before and after the improvement of the seal structure of the large diameter (φ9.5m) rotor to the preheater, the importance of grasping the law of thermal deformation is expounded. The original design of the preheater does not consider the thermal deformation of the upper beam. During commissioning, some problems were exposed. After investigation and measurement, the heat deformation of the upper beam was mastered. Local improvements were made to the sealing system of the preheater, and the cold seal clearance was newly determined. Thermal deformation to match the rotor’s hot mushroom-shaped surface. After the local improvement of the preheater, the air leakage coefficient is: △ α A = 0.072, △ α B = 0.084, converted into (American ASME standard) air leakage rate: A A = 0.051, A B = 0.06, Advanced level. The preheater on the beam structure and the British company Gordon, the thermal deformation of preheater seal design has a certain reference value.