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四川广元旺苍建材有限公司
日产4500T/D新型干法水泥生产线主要能利用的余热在旋转窑的窑头和窑尾废气中,在正常生产时,窑头废气温度通常为350-400℃之间,而窑尾的废气温度也在300-350℃之间,这种工况通常利用纯低温余热锅炉进行窑炉热量的充分利用,锅炉产生蒸汽推动汽轮机转动从而驱动发动机发电,本工程采用4.5MW低压凝汽式汽轮机及发电机组,工艺虽然简单但控制却要求较高,汽机监测系统部分主要是本特利公司的3500系统平台,技术很成熟在此不多描述,DCS集散控制系统选用ABB 的Industrial IT AC800F系统,本系统执行方式采用多级进程方式,对多级任务可以采用不同的优先级和采样周期,优化系统负荷便于灵活控制,由于本系统控制的重要性,本系统采用一对冗余的AC800F控制器,冗余配置的优点在于一旦某个工作的控制器发生故障,热备控制器会无扰动的切换的主控制器的角色,然后通过各种方式报警,例如:操作站硬件报警,现场站故障灯报警等,提示故障。冗余控制器之间通过以太网模件进行数据交换,保持主辅控制器的数据同步,而且所有的模件(包括电源模件,以太网模件和总线模件)都为相同配置,保证冗余的完整性和可恢复性,一旦失电,以太网模件中的后备电池能保证程序存贮的完整性,系统受电之后能在程序的引导下自动恢复正常工作而无需人为做任何设置。控制器直接通过Profibus-DP通讯连接S800系列可支持热拔插IO模块,数字量模块为16通道,模拟量为8通道,选择这些模块的优势是在同一个模块上减少通道损坏时对其他通道的影响,便于更换。控制器通过以太网直接和上位机通讯,同时,系统还提供Modbus接口连接水泥生产线的主控系统,以便进行重要数据交换.

本系统在锅炉和汽机的控制及联锁说明:
主要控制对象有窑头、窑尾锅炉三冲量控制,控制对象为给水调节阀,以锅炉液位,蒸汽流量为参量实现串级调节;汽机调速由上位给定转速,再通过505调速系统控制汽机转速,主要联锁涉及汽机部分多,有汽机转速保护联锁,汽机前、后轴震动保护联锁,汽机推力轴承轴瓦温度及回油温度保护联锁,保安油压保护联锁,凝汽器压力及润滑油压力保护联锁。系统在并网回路上主要监测点有保安联络开关柜的分、合闸监测,主进线开关柜的分、合闸监测。
脚注信息
版权所有 Copyright(C)2009-2014 上海协开自动化科技有限公司 技术支持:寻程科技 沪ICP备15001616

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