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</div> </div> <div id="ewi4gwe" class="bannbottom03"></div> <div id="kcc404w" class="indexbann pagebann_bg4"> </div> <div id="s0ycoc0" class="bannbottom09"></div> <div id="mesiiiu" class="bannbottom08"> <div id="iceuc0c" class="main"> <div id="meycocs" class="crumbs1"><a href="http://www.unionmasks.com">首頁(yè)|HOME PAGE</a><span> > </span><a href="http://www.unionmasks.com/jishu/">幫助與支持</a> > 粉塵爆炸原理</div> </div> </div> <div id="usemgy0" class="main"> <div id="meoamse" class="subna1"> </div> <div class="uoyqecw" id="Article"> <h1>粉塵爆炸原理<br /> <span>2013-08-05 16:03:26 來(lái)源：評論：<a href="#comment_iframe" id="comment">0</a> 點(diǎn)擊：</span><span id="hits"></span></h1> <div id="qgg0cqa" class="summary" >凡是呈細粉狀態(tài)的固體物質(zhì)均稱(chēng)為粉塵。能燃燒和爆炸的粉塵叫做可燃粉塵；浮在空氣中的粉塵叫懸浮粉塵；沉降在固體壁面上的粉塵叫沉積粉塵?，F已發(fā)現以下七類(lèi)物質(zhì)的粉塵具有爆炸性：金屬（如鎂粉、鋁粉）；煤炭；糧食（如小麥、淀粉）；飼料（如血粉、魚(yú)粉）；農副產(chǎn)品（如棉花、煙草）；林產(chǎn)品（如紙粉、木粉）；合成材料（如塑料、染料）。 </div> <div id="iw0y04s" class="content"> <div><strong>凡是呈細粉狀態(tài)的固體物質(zhì)均稱(chēng)為粉塵。能燃燒和爆炸的粉塵叫做可燃粉塵；浮在空氣中的粉塵叫懸浮粉塵；沉降在固體壁面上的粉塵叫沉積粉塵?，F已發(fā)現以下七類(lèi)物質(zhì)的粉塵具有爆炸性：金屬（如鎂粉、鋁粉）；煤炭；糧食（如小麥、淀粉）；飼料（如血粉、魚(yú)粉）；農副產(chǎn)品（如棉花、煙草）；林產(chǎn)品（如紙粉、木粉）；合成材料（如塑料、染料）。 </strong></div> <div><strong> </strong><br /> （1）粉塵爆炸的條件 </div> <div> <br /> 可燃粉塵爆炸應具備三個(gè)條件，即粉塵本身具有爆炸性；粉塵必須懸浮在空氣中并與空氣混合到爆炸濃度；有足以引起粉塵爆炸的熱能源。 </div> <div> 和氣體爆炸相比，粉塵爆炸所要求的最小引燃能較大，達10毫焦耳，為氣體爆炸的近百倍。因此，一個(gè)足夠強度的熱能源也是形成粉塵爆炸的必要條件之一。 </div> <div> <br /> （2）粉塵爆炸的過(guò)程 </div> <div> 第一步：懸浮粉塵在熱源作用下迅速地被干餾或氣化而產(chǎn)生可燃氣體。 </div> <div> 第二步：可燃氣體與空氣混合而燃燒。 </div> <div> 第三步：燃燒產(chǎn)生的熱量從燃燒中心向外傳遞，引起鄰近的粉塵進(jìn)一步燃燒。如此循環(huán)下去，反應速度不斷加快，最后形成爆炸。 </div> <div> <br /> （3）粉塵爆炸的特點(diǎn) </div> <div> 1) 具有二次爆炸的可能。粉塵初始爆炸的氣浪可能將沉積的粉塵揚起，形成爆炸性塵云，在新的空間再次產(chǎn)生爆炸，這叫二次爆炸。這種連續爆炸會(huì )造成嚴重的破壞。 </div> <div> 2) 粉塵爆炸感應期長(cháng)，達數十秒，為氣體的數十倍。 </div> <div> 3) 粉塵爆炸可能產(chǎn)生兩種有毒氣體；一種是一氧化碳，另一種是爆炸物質(zhì)（如塑料等）自身分解產(chǎn)生的毒性氣體。 </div> <div> <br /> （4）影響粉塵爆炸的因素 </div> <div> 1) 物理化學(xué)性質(zhì)。物質(zhì)的燃燒熱越大，則其粉塵的爆炸危險性也越大，例如煤、碳、硫的粉塵等；越易氧化的物質(zhì)，其粉塵越易爆炸，例如鎂、氧化亞鐵、染料等；越易帶電的粉塵越易此起爆炸。粉塵在生產(chǎn)過(guò)程中，由于互相碰撞、磨擦等作用，產(chǎn)生的靜電不易散失，造成靜電積累，當達到某一數值后，便出現靜電放電。靜電放電火花能引起火災和爆炸事故。 </div> <div> <br /> 粉塵爆炸還與其所含揮發(fā)物有關(guān)。如煤粉中當揮發(fā)物低于10%時(shí)，就不再發(fā)生爆炸，因而焦炭粉塵沒(méi)有爆炸危險性。 </div> <div> 2) 顆粒大小。粉塵的表面吸附空氣中的氧，顆粒越細，吸附的氧就越多，因而越易發(fā)生爆炸，而且，發(fā)火點(diǎn)越低，爆炸下限也越低。隨著(zhù)粉塵顆粒的直徑的減小，不僅化學(xué)活性增加，而且還容易帶上靜電。 </div> <div> 3) 粉塵的濃度。與可燃氣體相擬，粉塵爆炸也有一定的濃度范圍，也有上下限之分。但在一般資料中多數只列出粉塵的爆炸下限，因為粉塵的爆炸上限較高 </div> </div> <p style="margin-bottom:10px"> <strong>相關(guān)熱詞搜索：</strong><a href="http://www.unionmasks.com/index.php?m=content&c=tag&a=lists&tag=%E7%B2%89%E5%B0%98%E7%88%86%E7%82%B8%E5%8E%9F%E7%90%86" class="blue">粉塵爆炸原理</a> <a href="http://www.unionmasks.com/index.php?m=content&c=tag&a=lists&tag=%E6%97%A0%E5%B0%98%E5%AE%A4%E5%90%B8%E5%B0%98%E5%99%A8" class="blue">無(wú)塵室吸塵器</a> <a href="http://www.unionmasks.com/index.php?m=content&c=tag&a=lists&tag=%E5%90%B8%E5%B0%98%E5%99%A8" 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