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平焰燒嘴的結構及原理

  平焰燒嘴是以進入到燒嘴的煤氣和燃燒所需的空氣,在旋流器的作用下,煤氣和空氣強烈的旋轉,沿垂直于燒嘴磚中心線的爐墻表面展開,并在緊靠爐墻的一層空間內燒盡,形成園盤型火焰,其直徑在1~3m,其厚度在100~200mm。 采用平焰燒嘴后,由于熱輻射能力加強,溫度場均勻,故升溫速度快,金屬氧化燒損率低,對實現鋼材均勻加熱,快速加熱,節約燃料具有顯著的效果

  煤氣平焰燒嘴

  一、結構原理  該型燒嘴以焦爐煤氣為燃料,進入燒嘴的煤氣和空氣以強烈旋轉沿垂直于燒嘴中心線的爐墻表面展開,并在緊靠爐墻表面的一層空間內混合燃燒形成平火焰,火焰直徑1~3米,火焰厚度100~200毫米。采用平焰燒嘴后,由于輻射能力強,溫度場均勻,可實現鋼材均勻加熱,快速加熱,節約燃料顯著。

  燒嘴結構示意,見圖1。性能數據,見表1;結構尺寸,見表2。

  二、燒嘴性能數據及技術性能 燒嘴型號 燒嘴能量(標米3/時) 煤氣低發熱量(千焦/標米3) 燒嘴前煤氣壓力(Pa) 燒嘴前空氣壓力(Pa) PM-Ⅲ-1 30 13400~17600 額定 16750 2000 2500 PM-Ⅲ-2 50 PM-Ⅲ-3 75 PM-Ⅲ-4 100 PM-Ⅲ-5 120 PM-Ⅲ-6 160

  三、使用說明

  1.該燒嘴使用的焦爐或城市煤氣,其發熱量范圍為3200~4200千卡/標米3,選擇燒嘴型號時可根據實際使用的煤氣發熱量按本燒嘴性能表中的額定煤氣發熱量換算燒嘴能量,并依此選擇燒嘴型號。

  2.預熱空氣時,燒嘴能量降為下列數值(嘴前煤氣壓力不變): 空氣預熱溫度(℃) 150 200 250 300 350 400 能量為正常量的百分數(%) 80 76 72 70 65 64

  3.當燒嘴前煤氣壓力700Pa時,燒嘴亦可正常燃燒;

  4.燒嘴火焰的旋轉方向為左、右不同的轉向。當同一爐窯內并排使用時,應把相鄰的兩個燒嘴的火焰轉向調為相反為佳;

  5.燒嘴使用一段時間后,應清理煤氣噴頭的噴孔。

  四、安裝要求

  1.燒嘴可以安裝在側墻或爐頂上。安裝在爐頂上時,外形尺寸為圖1中所示。當裝在側墻時去掉圖中所示燒嘴磚兩側斜角;

  2.燒嘴磚內平面與爐墻(頂)內平面保持平坦,不允許爐墻(頂)平面凸出,影響正常燃燒;

  3.先把燒嘴定位后,再接管道,管道安裝不應影響燒嘴的定位。

  五、點火

  1.打開爐門和煙道閘板,開啟鼓風機,吹掃凈爐膛內可燃氣體;

  2.點火。微開啟燒嘴前空氣蝶閥,供少量空氣,明火放在燒嘴磚喇叭口根部,再開煤氣閥。著火后調節空煤氣比例,達到最佳狀態。以后應隨時注意煤氣、空氣的壓力流量變化,及時調整,保持燃燒穩定;

  3.如一次未點燃,應立即關閉煤氣閥門,打開空氣閥,重新吹掃并查明原因后再次點火;

  4.停爐時先關閉煤氣閥。

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