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    煤粉鍋爐等離子體點火技術
    低NOx優化燃燒技術
    煤粉鍋爐微油點火技術
    typical case
    典型案例

    粵電靖海發電有限公司1000MW機組

    2018-12-09文章來源:原創文章

    1、工程概況

      粵電靖海發電有限公司廠址位于廣東省揭陽市惠來縣東端南海靖海灣,天和技術的等離子體點火系統應用于4#機組上(1000MW).鍋爐是東方鍋爐廠生產的超超臨界參數、一次中間再熱、前后墻對沖燃燒、單爐膛、平衡通風、固態排渣、全鋼構架、全懸吊結構的Π型直流爐。采用中速磨煤機冷一次風機正壓直吹式制粉系統,每爐配6臺HP1163/Dyn型中速磨煤機,5臺運行,1臺備用,每臺磨煤機帶同層的8只煤粉燃燒器。

      燃燒器采用前后墻對沖布置,總共48只煤粉燃燒器分6層布置在鍋爐前后墻水冷壁上(前3、后3),每層各8只。鍋爐前、后墻最下層各布置1層等離子點火裝置。

      2、煤質特性

      設計和校核煤種的煤質成分分析見下表:

      3、等離子燃燒器改造方案

      本工程將鍋爐前墻和后墻最下層各8只煤粉燃燒器(共16只)改為等離子燃燒器。原燃燒器的配風分為一次風、二次風和三次風,二、三次風為旋流設計,中心風管內裝有啟動油槍和高能點火器。

      根據鍋爐及燃燒器的特點,不改變原燃燒器的接口尺寸,取消原燃燒器的中心風管及其內部的啟動油槍,置換成等離子燃燒器。等離子燃燒器的噴口尺寸及風粉混合氣流特性保留了原有的煤粉燃燒器特性。

    粵電靖海電廠等離子體燃燒器結構圖

      4、項目運行情況

      粵電靖海電廠4#爐等離子體點火系統,2010年10月開始安裝,12月底安裝完成。2011年4月底進行等離子點火系統調試, 5月底開始點火吹管, 7月底168小時試運結束,等離子體點火系統總計運行300多小時。此期間等離子點火系統運行穩定,成功地實現了點火穩燃零投油。陰極的壽命超過200小時,陽極一直未更換,仍在繼續使用。

      據調試單位介紹,與該廠同型號的3#爐等離子點火裝置相比,天和技術在以下幾方面具有以下優勢:

      1)等離子燃燒器壁溫一直控制在200℃以下,從未出現過超溫。

      2)4#爐點火期間飛灰含碳量明顯要低于3#爐。

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