YOKOGAWA UT550-11自动化
商品详情
1 引言
随着企业生产变化,方大特钢4500nm3/h制氧由最初定位的过渡机组变成了主力机组,为提高该制氧机组运行的性能,2010年1月对该机组控制系统实施了全面改造,由常规仪表结合小型plc控制改为dcs系统控制,所采用的dcs系统为hollias-macs系统,所有控制信号点均进入dcs系统,经过1个余月时间安装、调试,完成了改造工程。实现了:空压机、膨胀机、氧压机、氮压机启停自动控制及联锁,分子筛系统自动控制、空分装置调节阀自动控制、空压机、膨胀机双油泵互备控制等功能。
2010年4月初,4500nm3/h制氧开机,从运行情况看,所设计的主控制方案满足了系统需要,但由于4500制氧机组本身的特性,加上组态时局部的漏项,部分报警参数、画面的设置仍存有一定的不合理性,为此在设备运行期间多次进行了在线修改、下装,
hollias-macs系统良好的无扰动下装、增量下装功能,在线下载一直没有影响设备的正常运行。但2010年6月20日的一次程序下载,不仅引起了空分装置停机,同时造成了空压机烧瓦重大事故发生。dcs程序下载引起装置停机可以想象(行业内有事例);造成空压机烧瓦却难以理解,表明空压机的自动联锁都没有发生作用。为此专门组织力量对本次事故进行剖析。
2 事故描述
2010年6月20日10:30左右,由于v1212阀门阀开信号未在规定的时间闭合,造成分子筛切换系统控制程序自动转为暂停。
分子筛系统控制程序是制氧机组的主控制程序,是通过dcs系统控制14个阀及电加热器的周期动作。执行1#分子筛吸附器“卸压→加热→冷吹→充压→切换”——2#分子筛吸附器“卸压→加热→冷吹→充压→切换”动作,除系统初始化步,控制系统共分10步动作,不断循环,两个分子筛吸附器轮流工作、再生。一旦不能正常运行或故障较长时间不能发现,将影响生产正常运行,甚至较长时间停产。v1212阀位开关不到位造成分子筛程序暂停已出现数次,虽经处理,但经过一段时间运行后,总是不理想(并且经常处于报警临界状态),给生产造成了一定影响。
v1212阀门实际动作是正常的,只是阀位反馈不正常。程序设计是:阀位反馈与阀门动作不同步超30s报警,且联锁程序转为手动。为此对程序进行修改,同时进行了下装(考虑到和利时系统可以增量下装),但在本次下装后,却最终造成了制氧机组的停机,空压机烧瓦事故。
3 事故分析
程序下装因素造成设备停机是可预测的,但程序下装造成空压机烧瓦事故难以理解。在本案例中,程序下装后,各联锁都没有发生作用,油泵没有联锁启动,压缩机没有联锁停机,这是很不正常的现象。
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***************漳州鼎晟达自动化设备有限公司***************
联系人:林朝艺(销售经理)
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【主营产品】
1:Invensys Foxboro(福克斯波罗):I/A Series系统,FBM(现场输入/输出模块)顺序控制、梯形逻辑控制、事故追忆处理、数模转换、输入/输出信号处理、数据通信及处理等。
2:Invensys Triconex: 冗余容错控制系统、基于三重模件冗余(TMR)结构的最现代化的容错控制器。
3:Westinghouse(西屋): OVATION系统、WDPF系统、WEStation系统备件。
4:Rockwell Allen-Bradley: Reliance瑞恩、SLC500/1747/1746、MicroLogix/1761/1763/1762/1766/1764、
CompactLogix/1769/1768、Logix5000/1756/1789/1794/1760/1788、PLC-5/1771/1785等。
5:Schneider Modicon(施耐德莫迪康):Quantum 140系列处理器、控制卡、电源模块等。
6:ABB:工业机器人备件DSQC系列、Bailey INFI 90等。
7:Siemens(西门子):Siemens MOORE, Siemens Simatic C1,Siemens数控系统等。
8:Motorola(摩托罗拉):MVME 162、MVME 167、MVME1772、MVME177等系列。
9:XYCOM:I/O 、VME板和处理器等。
10:GE FANUC(GE发那科):模块、卡件、驱动器等各类备件。
11:Yaskawa(安川):伺服控制器、伺服马达、伺服驱动器。
12:Bosch Rexroth(博世力士乐):Indramat,I/O模块,PLC控制器,驱动模块等。
13:Woodward(伍德沃德):SPC阀位控制器、PEAK150数字控制器。
14:工业机器人系统备件。
15: 英维斯(TRICONEX):TRICON DCS的系列,如:3805E
另外还有 雅马哈(YAMAHA), 贝加莱(B&R), 欧姆龙(OMRON), KEBA, 安川(YASKAWA) 等品牌的停产备件。
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