鍋爐對流受熱面積灰的原因和危害分析

??2022-08-08????????

鍋爐的對流受熱面一般指對流式過熱器、對流式再熱器、對流管束、省煤器和空氣預(yù)熱器。因為這些受熱面的煙氣側(cè)放熱是以對流放熱為主，所以稱為對流受熱面。

鍋爐運行時，對流受熱面的積灰是無法避免的。仔細觀察就會發(fā)現(xiàn)，對流受熱面積的灰都是顆粒很小的灰。當灰粒的當量直徑小于3um時，灰粒與金屬間和灰粒間的萬有引力超過灰粒本身的重量。因此當灰粒接觸金屬表面時，灰粒將會黏附在金屬表面上不掉下來。煙氣流動時，因為煙氣中灰粒的電阻較大會發(fā)生靜電感應(yīng)。雖然對流受熱面的材料是良好的導(dǎo)體，但是當對流受熱面積灰后，其表面就變成絕緣體，很容易將因靜電感應(yīng)而產(chǎn)生異種電荷的灰粒吸附在其表面上。

實踐證明，對流受熱面積的灰大多是當量直徑小于lOum的灰粒。對流受熱面的積灰一開始較快，但很快會達到動態(tài)平衡，一方面積灰繼續(xù)發(fā)生，另一方面在煙氣中顆粒較大的灰粒沖擊下又使對流受熱面上的積灰脫落。由于管子正面受到較大灰粒的沖擊，所以管子的正面積灰較少，而管子的背面積灰較多。由于灰粒的導(dǎo)熱系數(shù)很小，對流受熱面積灰，使得熱阻顯著增加，傳熱惡化，煙氣得不到充分冷卻，排煙溫度升高，導(dǎo)致鍋爐熱效率降低，甚至影響鍋爐出力。積灰還使煙氣流通截面減小，煙氣流動阻力增加，使引風機的耗電量增加。因此采取各種措施保持對流受熱面的清潔對提高鍋爐熱效率，節(jié)約引風機的耗電量是很有必要的。

上一篇：鍋爐從冷態(tài)啟動到穩(wěn)定狀態(tài)要額外消耗多少熱量?

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下一篇：為什么燃油鍋爐的過熱器積灰用水沖洗效果較好?

專題報道

專利余熱鍋爐設(shè)備全解析: 鄭鍋在余熱回收領(lǐng)域深耕三十余載，具有核心的技術(shù)競爭力，僅余熱鍋爐系列就擁有三十余項國家授權(quán)專利，是國內(nèi)余熱鍋爐行業(yè)首家三廢余熱鍋爐、碳素余熱鍋爐等爐型市場占有率達到70%以上的技術(shù)壟斷型企業(yè)。

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鄭鍋熱水鍋爐專題: 鄭鍋熱水鍋爐——打造清潔供熱新模式。鄭鍋股份是中西部知名的供暖熱水鍋爐和工業(yè)熱水鍋爐生產(chǎn)廠家。旗下熱水鍋爐系列包括生物質(zhì)熱水鍋爐、燃煤熱水鍋爐以及燃油燃氣熱水鍋爐等產(chǎn)品，可提供額定熱功率1.4MW-168MW的熱水鍋爐產(chǎn)品，型號參數(shù)多樣，歡迎直接在線咨詢詳情！

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