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class="content"><p><span>需求數(shù)量：</span>0</p><p><span>價格要求：</span>面議</p><p><span>所在地：</span>上海市</p><p><span>包裝要求：</span><span style="color: #f30;"></span></p><p><span>產(chǎn)品關(guān)鍵詞：</span>貴州空氣預(yù)熱器誠信企業(yè)</p><p><span>***更新：</span>2020-06-18 16:29:29</p><p><span id="click" >瀏覽次數(shù)：0次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="b8pg8ah" class="rightbox"><h3>公司基本資料信息</h3><p style="border:0;"><a rel="nofollow">上海板換機(jī)械設(shè)備有限公司</a></p><p><span>聯(lián)系人：</span>張云周</p><p><span>郵箱: </span>shinfo@shphe.com</p><p><span>電話: </span>15921733465</p><p><span>傳真: </span>021_</p><p><span>網(wǎng)址: </span>http://www.shphe.com</p><p><span>手機(jī): </span>021-57247534</p><p><span>地址: </span>山陽鎮(zhèn)山寧路99號</p><p>[當(dāng)前離線] <a rel="nofollow"> [加為商友] </a><a rel="nofollow"> [發(fā)送信件] </a></p></div></div><div id="o2xsx78" class="page-proshow02"><p class="title">詳細(xì)說明</p><div id="i2a3tqx" class="box"><p><p> 在選擇傳熱元件時，要考慮到用戶的實際情況，從設(shè)備長期安全穩(wěn)定運(yùn)行的角度出發(fā)，適應(yīng)煤種在一定范圍內(nèi)的變化，確保在使用過程中不堵灰，保持較低的排煙溫度，保證在長時間的運(yùn)行過程中，鍋爐的效率保持在較高水平。而不能*考慮單一設(shè)計煤種，在燃料變化后，無法滿足機(jī)組經(jīng)濟(jì)、穩(wěn)定和安全運(yùn)行的需要，貴州空氣預(yù)熱器誠信企業(yè)。元件板型的選擇需同時考慮傳熱效果、流通阻力和堵灰可能三個因素。采用傳熱效果好的傳熱元件能降**造成本，但是不一定流通阻力小或耐堵灰，造成運(yùn)行成本上升。例如某公司在預(yù)熱器冷段采用HS7、HS8等DU系列波形元件，雖然預(yù)熱器轉(zhuǎn)子重量變輕，但是當(dāng)燃料灰分變多，或用于SCR預(yù)熱器時，貴州空氣預(yù)熱器誠信企業(yè)，很容易造成堵灰，使阻力上升，貴州空氣預(yù)熱器誠信企業(yè)。傳熱效果和流通阻力往往構(gòu)成一對矛盾，因為提高換熱效果是通過加強(qiáng)氣流通道的局部紊流狀況，即加大換熱表面波紋密度或傾斜角，但這種方式也同時加大了流通阻力系數(shù)。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="貴州空氣預(yù)熱器誠信企業(yè)" src="http://tyunfile.71360.com/UploadFile/shbhjxsb/637220412821406250/101176.jpg"></div><p> 加寬扇形板，形成雙密封面，漏風(fēng)率可降低30%，通常漏風(fēng)率低于6%。不足之處是風(fēng)煙阻力略有增加，轉(zhuǎn)子重量增加；如將原傳熱元件拆包切割，易造成傳熱面積下降和損元件。鶴崗電廠采用了該方案。2）三道密封改造：在原雙密封改造基礎(chǔ)上，進(jìn)一步增加轉(zhuǎn)子隔倉，加寬扇形板，形成三道密封面，漏風(fēng)率可在雙密封基礎(chǔ)上進(jìn)一步下降12%。但造成隔倉過密，傳熱元件偏小，風(fēng)煙阻力上升10%左右。目前部分一次風(fēng)壓頭較高的新機(jī)組采用。3）拖拽式軟密封技術(shù)：類似柔性密封技術(shù)，在徑向隔板原徑向密封片的基礎(chǔ)上，再增加一道較薄的有一定彈性和折角較大的密封片，以增加密封道數(shù)，并允許密封片與扇形板有一定接觸。在投運(yùn)初期能有效降低漏風(fēng)率（可至4%左右）。不足之處：只在間隙小于10mm時有效，大機(jī)組無LCS（間隙自調(diào)裝置）時熱端效果不明顯；運(yùn)行時間長后接觸式密封片易磨損失效。加壓密封技術(shù)：通常用于GGH，即GGH的低泄漏風(fēng)系統(tǒng)。綜合性密封技術(shù)：部分廠家綜合以上多種技術(shù)的特點，對空預(yù)器徑向、軸向、周向（旁路）密封和相關(guān)靜密封進(jìn)行針對性設(shè)計，實施漏風(fēng)率控制；1）運(yùn)行調(diào)節(jié)及維護(hù)注意事項1）除精心控制好徑向、軸向密封間隙外，還要注意控制好密封板的端部密封。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="貴州空氣預(yù)熱器誠信企業(yè)" src="http://tyunfile.71360.com/UploadFile/shbhjxsb/637220414500673828/8758232.jpg"></div><p> 空氣預(yù)熱器漏風(fēng)主要可以分為以下兩類:(1)攜帶漏風(fēng)。攜帶漏風(fēng)主要是因為空氣預(yù)熱器在轉(zhuǎn)動過程中,一部分駐留在換熱元件中的空氣被攜帶到煙氣中去,一部分駐留在換熱元件中的煙氣被攜帶到空氣中去。這種情況造成的漏風(fēng)量很小,但這種漏風(fēng)是空氣預(yù)熱器的構(gòu)造無法避免的。(2)直接漏風(fēng)。直接漏風(fēng)主要是由于空氣預(yù)熱器結(jié)構(gòu)本身為保證安全運(yùn)行而使煙氣與空氣之間存在一定的間隙;同時,由于煙氣和空氣之間存在壓差也會產(chǎn)生漏風(fēng)。對于三分倉空氣預(yù)熱器，它不但有空氣區(qū)與煙氣區(qū)之間的間隙漏風(fēng)，還有一次風(fēng)倉與二次風(fēng)倉之間漏風(fēng)。此外，外界的空氣也可以通過轉(zhuǎn)軸和機(jī)殼之間的間隙漏入煙氣區(qū)。直接漏風(fēng)主要包括徑向漏風(fēng)、軸向漏風(fēng)、環(huán)向漏風(fēng)。徑向漏風(fēng)占直接漏風(fēng)量的2/3左右,主要是因為轉(zhuǎn)子上、下端溫度差異而發(fā)生蘑菇狀變形,進(jìn)而造成密封間隙的增大和漏風(fēng)率的增加；其次環(huán)向的密封間隙漏風(fēng)，**小的是軸向風(fēng)。在間隙及漏風(fēng)通流面積相同條件下冷端漏風(fēng)量較熱端大。為了減小漏風(fēng)，回轉(zhuǎn)式空氣預(yù)熱器均裝有密封裝置，主要有徑向密封、軸向密封、和環(huán)向密封。徑向密封：用以防止和減少空預(yù)器中空氣沿轉(zhuǎn)子的上、下端面通過徑向間隙漏到煙氣區(qū)的漏風(fēng)量。</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/303976.html</p></div></div></div></div></div><div id="ca8pax8" class="page-right twoColRt"><div id="337l88y" class="box01 margin10 clearfix"><h3><a 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