RELANCE 0-60028-2 靜態(tài)跳閘模塊
隨著DCS在大型火電廠的普遍應用，如何確定DCS檢修內(nèi)容、檢修周期及維修項目才能保證DCS在火電廠應用條件下安全運行，是提高其可靠性的關(guān)鍵。實際應用中，應充分利用計算機系統(tǒng)自診斷功能，及早發(fā)現(xiàn)異常情況，防止模件故障;檢修時也要有合理的檢修工藝和程序，兼顧DCS本身檢修和重視控制系統(tǒng)外部設(shè)備的檢修，并要根據(jù)DCS系統(tǒng)特性列出檢修注意事項，做好一定的防護措施，以避免DCS裝置模件在檢修中受到損害。
調(diào)節(jié)閥儀表氣源壓力低或儀表空氣全部斷氣
當發(fā)現(xiàn)多個自調(diào)系統(tǒng)失靈，監(jiān)控畫面上自調(diào)閥閥位在全開或全關(guān)位置，立即檢查儀表氣源壓力，若氣源壓力小于0．4MPa，則不正常，檢查氣源管道有無堵塞或 漏氣現(xiàn)象；若氣源壓力小于0．2MPa，立即進行緊急停車。將監(jiān)控畫面上的自調(diào)系統(tǒng)全部打到手動，將調(diào)節(jié)閥閥位調(diào)到安全位置，通知儀表工檢查氣源，同時到 現(xiàn)場進行操作，關(guān)閉調(diào)節(jié)閥兩端的截止閥，用旁路閥操作。
結(jié) 論
DCS發(fā)生故障時，操作工應掌握一定的判別方法，及早發(fā)現(xiàn)問題，進行適當處理，可以避免或者減少對工藝控制的影響。
In the control group screen, manual and automatic switching is not possible, or after manually inputting data, once confirmed, it returns to the original data and cannot be modified.
(3) In the trend chart screen, several trends remain unchanged as straight lines.
(4) In the monitoring screen, multiple data fluctuate significantly at the same time.
View data from the monitoring screen
When the following situations occur, it indicates that there is a problem with the control system. The microcomputer maintenance personnel should be notified immediately for repair, and the operator should come to the site for handling.
Frequently changing data remains unchanged for a long time, and several or all data remain unchanged.
DCS system fault diagnosis and handling methods: With the improvement of automation level, DCS control system (distributed control system) has gradually replaced conventional instruments, and its superiority has been accepted by a large number of operators. But when a malfunction occurs, it can cause the device to shut down or even cause accidents. It is very important to detect and handle various faults early and appropriately. Our company's synthetic ammonia process uses multiple sets of Zhejiang University Central Control JX-300XDCS for control, which is stable and reliable. Based on years of maintenance experience, we have summarized an effective set of fault identification and handling methods to address some of the existing problems.