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一、前言青海水泥厂是70年代末设计并投产的年生产能力为30万t的老厂，拥有一条φ4m×60m双立筒预热器窑系统。受历史条件的报制，全厂生产控制设备采用较落后的控制方式。长期以来，电机设备的启停一直延用“按钮、搬把开关—继电器”单机工作方式，部分工艺段和岗位采用继电
I. Introduction Qinghai Cement Plant is an old plant with an annual production capacity of 300,000 tons designed and put into operation in the late 1970s and has a φ4m × 60m dual vertical preheater kiln system. By the historical conditions of the newspaper, the whole plant production control equipment used more backward control. For a long time, motor equipment start and stop has been extended with “button, move the switch - relay” stand-alone work, some process sections and posts using relay