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連鑄二冷動態配水優化控制系統
詳細介紹

一、系統簡介:
東北大學自動化儀表研究所與東北大學自動化儀器儀表中心合作研發的連鑄二冷動態配水系統(NEU_CAST)是應用于連鑄方坯、板坯生產過程穩定和提高鑄坯質量、開發新品種鋼的二級動態配水系統,尤其適用于澆注溫度、拉速波動較為頻繁,鑄坯質量不穩定、要求改善鑄坯質量以及新鑄機二冷配水系統開發等應用場合。該系統融合檢測、模型和控制三位一體,采用先進的復合控制方法,在基礎自動化級(L1)實現基于有效拉速和中間包連續測溫的前饋開環控制,在過程控制級(L2)實現基于在線凝固傳熱模型的閉環反饋控制,克服澆注溫度和拉速波動等影響,實現對鑄坯表面溫度和凝固速率的穩定控制,改善鑄坯內部凝固組織與結構,減輕或消除鑄坯內部裂紋、中心縮孔、疏松和中心偏析等缺陷,提高鑄坯質量。
2003年該系統通過江蘇省科技廳技術鑒定,2010年與臺灣中鋼進行技術交流,技術成果經同行專家鑒定為“國內一流、國際先進”,其先進性可比擬國外VAI、Danieli同類技術。
該系統目前已在多家鋼廠獲得應用,取得了改善鑄坯質量的明顯效果,現場反饋良好,繼續積極推廣應用中。
二、技術特點:
(1) 在線凝固傳熱模型,對凝固傳熱過程進行實時跟蹤顯示;模型通過現場鑄坯表面測溫等手段進行修正,保證其準確性和可靠性;
(2) 基于混沌蟻群算法(CACO) 及冶金準則,結合應力場分析模型,對拉速基礎水量進行多目標優化,汲取二次方配水和等比水量配水的優點,實現三次方配水形式;
(3) 基于有效拉速實現拉速水量動態前饋,克服拉速突變時引起的鑄坯表面溫度劇烈變化和引發的鑄坯質量不穩定問題;
(4) 將中間包過熱度引入二冷配水,克服其波動引起的鑄坯表面溫度變化,促進恒穩拉速工藝的實現,以穩定鑄坯液芯,保持凝固前沿界面的平整光滑,避免液芯波動引起凝固前沿參差不齊,在凝固遲后部位引發鑄坯內部質量問題;同時保持最佳工作拉速將有利于充分發揮末端電磁攪拌等裝備的冶金效果,保證良好穩定的鑄坯質量;
(5) 基于在線凝固傳熱模型實時計算鑄坯表面溫度,實現連鑄二冷配水的閉環控制,進一步減小擾動影響,精確控制鑄坯表面溫度,提高鑄機控制水平,完善鑄坯質量;
(6) 提供穩定可靠的下位機PLC程序和簡潔友好的上位機人機界面,便于現場操作和應用。


 

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