PLC控制系统主要是实现三座热风炉的燃烧、焖炉、送风等三个状态的转换，以及实现三座热风炉状态转换时的相互联锁。保障热风炉的送风温度和风量，促进高炉炼铁的顺利进行。●阀门控制关系及联锁热风炉的工作状态有燃烧、焖炉、送风三种状态，状态的转换靠控制名阀门的动作，其受控阀门及三种状态对应的阀门状态符合工艺要求。实现三座热风炉的相互联锁，促进高炉的稳定生产，主要是冷风联锁功能。并通过工艺参数的设定，保障热风炉燃烧制度的实现。实现热风炉状态转换的阀门联锁和自动开关，达到能够实现计算机手动/半自动换炉的目的，在设备条件、工艺调件达到要求的时候能够实现自动换炉。对煤气总管压力调节阀、空气总管压力调节阀、煤气支管调节阀、空气支管调节阀能够进行计算机手动操作，在设备条件达到的情况下，能够进行自动调节。
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