Resistance in preheater system is discussed and index for evaluating preheater resistance is raised. Measures and requirements for resistance reduction in preheater system are set forth by the author.

• 对预热器系统的阻力进行了论述,提出了评价预热器系统阻力的指标要求,并对预热器系统降阻措施及要求进行了阐述。