本文分析回转式空气预热器造成漏风的原因,设计并实现了STD-BUS为主控制机的预热器间隙控制系统,解决了在400℃高温区非接触式测量间隙值的难点,所构成的闭环调节系统实时检测并调整间隙,同时可处理多路故障信号,及时发出信号完成显示、报警及打印等多种功能,系统研制成功为大型电站锅炉节能提供了新的途径。 This paper analyzes the cause of air leakage caused by the rotary air preheater, designs and realizes the preheater gap control system of the STD-BUS based controller, solves the difficulty of non-contact measurement gap value in the high temperature zone of 400 ℃, Closed-loop control system real-time detection and adjustment of the gap, at the same time can handle multiple fault signals, timely signal to complete the display, alarm and printing and other functions, the successful development of the system for large power station boiler provides a new way to save energy.