A02B-0299-C081電路板
A02B-0299-C081電路板
A02B-0299-C081電路板
4 處置措施
4.1 dcs程序修改
根據(jù)生產(chǎn)工藝、設(shè)備運(yùn)行要求,各類(lèi)裝置都設(shè)置了報(bào)警、聯(lián)鎖控制參數(shù),一旦參數(shù)異常,當(dāng)參數(shù)超過(guò)報(bào)警值時(shí),dcs發(fā)出報(bào)警提示,當(dāng)參數(shù)超過(guò)聯(lián)鎖值時(shí),dcs系統(tǒng)聯(lián)鎖停機(jī)。保護(hù)設(shè)備,是設(shè)置聯(lián)鎖參數(shù)的主要目的,一臺(tái)設(shè)備設(shè)置了聯(lián)鎖參數(shù),除特殊情況,都應(yīng)該及時(shí)投入聯(lián)鎖,如表1所示。
表1為空壓機(jī)聯(lián)鎖“取消聯(lián)鎖/投入聯(lián)鎖”參數(shù)表,這些點(diǎn)均為dcs自定義一字節(jié)變量點(diǎn),專(zhuān)門(mén)用于各測(cè)點(diǎn)聯(lián)鎖是否投用,是為了儀表檢修、設(shè)備調(diào)試等因素設(shè)置。這些參數(shù)在系統(tǒng)進(jìn)行初始化下裝時(shí)有的為on,有的為off,是由于系統(tǒng)初始化設(shè)置不同。
為此進(jìn)入控制算法→資源→變量設(shè)置程序段,對(duì)聯(lián)鎖用變量按實(shí)際需要進(jìn)行修改,表2為修改前后,空壓機(jī)變量設(shè)置部分程序段。變量屬性修改后,在初始化下裝時(shí),參數(shù)的聯(lián)鎖能自動(dòng)投用,油泵能自動(dòng)隨設(shè)備、工藝參數(shù)變化自動(dòng)控制,設(shè)備能聯(lián)鎖停機(jī),提高了設(shè)備運(yùn)行的性。
4.2 完善應(yīng)急操作措施
在程序下裝后,從dcs操作畫(huà)面上可以看到分子篩系統(tǒng)閥門(mén)全部關(guān)閉,空壓機(jī)自動(dòng)放空,一系列參數(shù)報(bào)警發(fā)生了??諌簷C(jī)兩油泵均停止了工作,油壓只有0.04mpa(低于聯(lián)鎖停車(chē)值),空壓機(jī)仍在運(yùn)行,操作人員立即在dcs上手動(dòng)啟動(dòng)空壓機(jī)油泵(約10s時(shí)間),而后空壓機(jī)軸承溫度、軸位移等參數(shù)出現(xiàn)報(bào)警,軸位移超過(guò)聯(lián)鎖設(shè)定值,操作人員到現(xiàn)場(chǎng)確認(rèn)空壓機(jī)運(yùn)行情況,空壓機(jī)有異聲響,為此,操作人員在dcs上緊急將空壓機(jī)停下來(lái)(整個(gè)過(guò)程約45s)。通知維護(hù)人員檢查空壓機(jī)狀況,拆開(kāi)空壓機(jī),發(fā)現(xiàn)止推瓦、徑向瓦受到嚴(yán)重的損傷,空壓機(jī)軸承亦有量的磨損。
整個(gè)事故發(fā)生在不足1分鐘的時(shí)間,但空壓機(jī)卻受到了較大的損壞(該空壓機(jī)還帶有高位油箱)。如果一發(fā)現(xiàn)空壓機(jī)油泵停止運(yùn)行,且油壓低于聯(lián)鎖值,立即將空壓機(jī)停下來(lái),設(shè)備的損傷可能會(huì)更小一些。為此,一是在dcs每幅操作畫(huà)面上設(shè)置緊急停機(jī)操作鍵;二是修改應(yīng)急操作措施,明確規(guī)定,一旦出現(xiàn)類(lèi)似情況,立即實(shí)施停機(jī)操作。
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