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     煤粉爐-SNCR脫硝技術 SNCR denitration technology

核心技術 Core technology

煤粉爐SNCR脫硝技術

   

SNCR技術,即選擇性非催化還原技術,核心是通過流場模擬分析和工藝設計,將尿素還原劑噴入爐膛內進行還原反應,還原劑通過安裝在屏式過熱器區域的噴槍噴入,還原劑迅速熱分解成NH3和其它副產物,隨后NH3與煙氣中的NOx進行SNCR反應而生成N2H2O。它是目前主要的煙氣脫硝技術之一,NH3的反應最佳溫度區為8501250


我們的設計專家擁有豐富的SNCR工程設計經驗,采用精準的流場模擬分析技術,經過詳細的CFD模擬和CKM計算,提供針對項目特點的個性化解決方案,其中CFB模擬包括:確定關鍵工藝參數的有效邊界條件,試驗還原劑分步策略的有效性和確定鍋爐內各點溫度場、煙氣成份的濃度。CKM計算每個化學反應的時間和溫度。制定準確的工藝設計方案和布置,向用戶提供專業的服務。同時采用新型噴射器,結合工藝設計可以達到提高脫硝效率的目的。


煤粉爐SNCR脫硝技術的特點:
· 使用安全的尿素還原劑,不產生液體或固體廢料;
· 所占空間極小,SNCR噴射區可以全部布置在鍋爐平臺上,設備采用模塊化結構,安裝簡便,建設周期短,施工簡單;
· 噴射是多層次的,可隨負載及操作指令分區自動控制;
· NOx脫除效率較高,通常大型鍋爐的SNCR脫硝效率在30%~40%,小爐型可以達到50%以上;
· 在機組排放要求苛刻時,具有與LNB+OFA和SCR技術結合的手段;
· 不需要催化劑,不需要更換引風機、空預器,投資少,運行成本低;
· 對煤種變化不敏感。

 


 

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