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href="/list/?4_1.html">行業資訊</a></div> <h3>行業資訊<s></s></h3> </div> <div class="content"> <div class="title">燃氣燃燒器的穩焰結構</div> <div class="mark"><span>發布時間：22-07-18</span><span>瀏覽次數：<i id="hits"><script src="/inc/AspCms_Visits.asp?id=553"></script></i></span></div> <div class="showContxt"> <p align="center"><p>燃氣燃燒器在工業爐和鍋爐上的應用比較廣泛，工業爐多以燃氣燒嘴為主，鍋爐以燃燒機居多。無論哪種燃燒設備，都會涉及到配風過程。包括火焰穩定機構和一次配風、二次配風。配風的主要作用是給燃燒器提供燃燒所需要的空氣，并形成有利的動力場，使燃料與空氣合理匹配，保證可靠的著火和穩定的燃燒。通常所講的燃燒器，包含了穩焰結構和配風結構。</p><p><br/></p><p>燃氣燃燒器或燒嘴在開始點火階段，需要有一個穩定形成初始火焰，保證有一個足夠的著火熱源,煤粉燃燒器應用領域很廣，在需要使燃料燃燒以加熱物料或反應的工業場合都需要用燃燒器。，才能讓后續不斷供入的燃氣和助燃空氣穩定、持續燃燒,高爐煤氣燒嘴中心管進氣時，被舉升的液體在環形空間的流速較低，其中的砂易沉淀、蠟易積聚，故常用環形空間進氣的舉升方式。。一般必須有一個低速區，該區域的氣流速度與火焰傳播速度相近，才能保持穩定燃燒,柴油燒嘴按進氣的通路氣舉也可分為環形空間進氣(正舉)和中心管進氣(反舉)兩種。。過高則會脫火，即吹滅火焰，過低則回火，這部分內容可以參考關于燃燒器脫火、回火相關介紹。</p><p><br/></p><p>燒嘴及燃燒器的穩焰方式及穩焰結構主要有以下幾種。</p><p><br/></p><p>一種是直流環莊射流。它是在燒嘴出口附近產生環裝噴出流股所包圍的負壓區，在此負壓區氣流呈渦旋狀態，實際是在導焰管內放置一塊擋板，氣流在擋板后形成低速回流區?；诖嗽順嫵闪硕喾N穩焰結構。以DK高速燒嘴燒嘴為例，采用旋轉式穩焰盤，外周傾斜風流槽與中心同心風孔形成旋流，以此達到穩焰。切向槽主要吹除積碳和補充空氣，同心排列的風孔主要掌控火焰形狀。</p><p><br/></p><p> </p><p><br/></p><p>另一種是同軸射流。它是環狀射流和中心射流組合構成，它是兩股射流邊界相接出產生兩股旋轉相反的渦流。兩股射流有速度差，這樣形成穩焰結構。</p><p><br/></p><p>其實無論是簡單還是復雜的燒嘴，都可以從不同的穩焰原理去分析，缺少穩焰結構的燃燒器是很難形成穩定火焰的。</p><p><br/></p><script src="/inc/AspCms_VisitsAdd.asp?id=553"></script></p> </div> <div class="fenx"> 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