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</div> <div id="29t7u9v4q4dg" class="news-main-content"> <p>1、選粉裝置的轉(zhuǎn)速調(diào)整不當(dāng)<br /> 調(diào)整選粉裝置轉(zhuǎn)子轉(zhuǎn)速是普通的調(diào)整細(xì)度的方法，也是重要的一種方法。通常改變細(xì)度：首先想到的是調(diào)整其轉(zhuǎn)速，跑粗時(shí)則增加轉(zhuǎn)速。<br /> 2、通風(fēng)量過(guò)大<br /> 在試生產(chǎn)中，用熱風(fēng)爐或投料較少時(shí)，磨機(jī)內(nèi)部通風(fēng)小，選粉機(jī)轉(zhuǎn)速設(shè)定為70-80%，細(xì)度基本就可以達(dá)到。隨著窯尾熱風(fēng)的增加，磨內(nèi)通風(fēng)增加，EP風(fēng)機(jī)擋板加大，細(xì)度就會(huì)上升，這時(shí)應(yīng)逐漸加大選粉機(jī)轉(zhuǎn)速，保證細(xì)度合格。<br /> 例如：當(dāng)窯投料至滿負(fù)荷時(shí)，窯尾風(fēng)量大，甚至出現(xiàn)EP風(fēng)機(jī)開到100%，磨入口還是出現(xiàn)正壓，這時(shí)細(xì)度容易變大，即使選粉機(jī)加至極限也不能使細(xì)度合格。這時(shí)可以考慮開磨旁路擋板，但這種方法比較危險(xiǎn)，易使磨機(jī)跳停。所以必須小心翼翼，每開1%就得觀察較長(zhǎng)時(shí)間，保證磨機(jī)平穩(wěn)運(yùn)行，在一定的范圍內(nèi)可降低細(xì)度，這種方法僅限于風(fēng)量過(guò)大時(shí)。<br /> 3、研磨壓力小<br /> 立式磨機(jī)壓力可在中控給定，一般開磨時(shí)壓力設(shè)定為小，隨著產(chǎn)量上升，必須逐漸加壓，否則因?yàn)槠扑楹湍肽サ哪芰Σ蛔?，而產(chǎn)生跑粗現(xiàn)象。<br /> 4、溫度影響<br /> 磨機(jī)出口溫度快速上升，或保持較高的溫度，出磨物料也可能跑粗，因?yàn)闇囟壬仙倪^(guò)程中，改變了磨內(nèi)流體速度和磨內(nèi)物料的內(nèi)能，增加細(xì)料做布朗運(yùn)動(dòng)出現(xiàn)偏大的物料被拉出磨體。這可能是窯尾風(fēng)溫、風(fēng)量變化或入磨物料水分變化而形成的這時(shí)可調(diào)節(jié)磨內(nèi)噴水解決。磨機(jī)與增濕塔串聯(lián)的工藝線，可調(diào)節(jié)增濕塔噴水，在風(fēng)量允許的情況下可摻循環(huán)風(fēng)或冷風(fēng)。<br /> 入磨不穩(wěn)易使磨內(nèi)工況大亂，風(fēng)速、風(fēng)量波動(dòng)，造成間斷跑粗。解決方法：穩(wěn)定入磨物料量，保證適量的研磨壓力，或適量降低產(chǎn)量。<br /> 5、入磨物料易磨性差<br /> 入磨物料強(qiáng)度和硬度大，或物料顆粒直徑大，難以破碎和粉磨，加上停磨循環(huán)次數(shù)增加，終表現(xiàn)為磨內(nèi)物料過(guò)多，解決方法：<br /> a.改善入磨物料的易磨性和直徑;<br /> b.適量加量;<br /> c.適量降低產(chǎn)量。<br /> 6、設(shè)備磨損嚴(yán)重<br /> 磨機(jī)長(zhǎng)時(shí)間運(yùn)轉(zhuǎn)后，選粉裝置葉片、磨輥輥皮、磨盤襯板、噴口環(huán)等都會(huì)受到不同程度的磨損，這種磨損可導(dǎo)致磨機(jī)細(xì)度跑粗。<br /> 選粉裝置、噴口環(huán)等平時(shí)要注意維護(hù)，損壞嚴(yán)重時(shí)要及時(shí)換、修補(bǔ)。<br /> 7、設(shè)備故障而產(chǎn)生跑粗<br /> 選粉機(jī)壞，出現(xiàn)物料跑粗，在無(wú)法恢復(fù)選粉裝置的一段時(shí)間內(nèi)，操作員采用控制壓力、風(fēng)量、溫度，使其細(xì)度降至21%左右，基本可供窯煅燒。<br /> 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