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onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="nho3hjq" class="content"><p><span>需求數(shù)量：</span>0</p><p><span>價(jià)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>海南空氣預(yù)熱器生產(chǎn)廠家</p><p><span>***更新：</span>2020-06-18 00:39:52</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="la7jqn7" 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?jiān)浦?/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(yáng)鎮(zhèn)山寧路99號(hào)</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="3r224w7" class="page-proshow02"><p class="title">詳細(xì)說(shuō)明</p><div id="bahuwda" class="box"><p><p> 空預(yù)器吹灰器故障、減壓閥調(diào)節(jié)性能不好，蒸汽帶水，不但減弱吹灰效果，嚴(yán)重時(shí)還會(huì)在高溫下與積灰泥化板結(jié)。吹灰蒸汽閥門不嚴(yán)泄露鍋爐空預(yù)器吹灰進(jìn)汽閥門不嚴(yán)密，導(dǎo)致水蒸氣漏入空預(yù)器內(nèi)部，導(dǎo)致空預(yù)器堵塞。故此，在每次停爐時(shí)，對(duì)空預(yù)器吹灰進(jìn)汽閥進(jìn)行檢查處理，能有效避免此原因?qū)е碌亩氯l(fā)生?？疹A(yù)器水沖洗不徹底鍋爐每次停爐后，都要進(jìn)行空預(yù)器水沖洗，沖洗過(guò)程一定要徹底，可采用透光法等手段進(jìn)行檢查，避免沖洗不徹底。否則會(huì)在極短時(shí)間內(nèi)加重堵塞，失去沖洗的意義。空預(yù)器壓差偏大，而在實(shí)行超低排放后，這一現(xiàn)象更加突出。高負(fù)荷時(shí)達(dá)到，吹灰器投運(yùn)后效果不明顯，海南空氣預(yù)熱器生產(chǎn)廠家，海南空氣預(yù)熱器生產(chǎn)廠家，原因分析如下：空預(yù)器堵塞燃煤鍋爐爐膛內(nèi)煙氣中的SO2約有％～％被氧化成SO3。加裝SCR系統(tǒng)后，海南空氣預(yù)熱器生產(chǎn)廠家，催化劑在把NOx還原成Ｎ２的同時(shí)，將約％的SO2氧化成SO3。SCR反應(yīng)器出口煙氣中存在的未反應(yīng)的逃逸氨（NH３）、SO３及水蒸氣反應(yīng)生成***氫氨或***氨：ＮＨ３＋ＳＯ３＋Ｈ２Ｏ→ＮＨ４ＨＳＯ４２ＮＨ３＋ＳＯ３＋Ｈ２Ｏ→（ＮＨ４）２ＳＯ４當(dāng)煙氣中的ＮＨ３含量遠(yuǎn)高于SO3濃度時(shí)，主要生成干燥的粉末狀***氨，不會(huì)對(duì)空預(yù)器產(chǎn)生粘附結(jié)垢。當(dāng)煙氣中的SO3濃度高于逃逸氨濃度時(shí)，主要生成***氫氨（ABS）。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="海南空氣預(yù)熱器生產(chǎn)廠家" src="http://tyunfile.71360.com/UploadFile/shbhjxsb/637220405032539062/8800983.jpg"></div><p> NH3和SO3濃度乘積影響***氫氨形成的另一重要因素是NH3和SO3濃度的乘積。以往認(rèn)為如果氨逃逸量在2μL/L以下將不會(huì)形成***氫氨，然而事實(shí)上在足夠高的SO3煙氣濃度下即使1μL/L的氨逃逸量仍可形成***氫氨。而且，隨著NH3和SO3濃度乘積的升高，***氫氨的**溫度升高，使得空預(yù)器發(fā)生***氫氨沉積的范圍進(jìn)一步加大。隨鍋爐運(yùn)行負(fù)荷變化，會(huì)導(dǎo)致通過(guò)催化劑的煙氣量、溫度、煙氣流速等發(fā)生變化，從而對(duì)***氫氨的形成產(chǎn)生影響：在鍋爐滿負(fù)荷(MCR)運(yùn)行時(shí)，催化劑區(qū)域溫度較高，流場(chǎng)也較為均勻，***氫氨的形成可能降低；反之，隨著鍋爐運(yùn)行負(fù)荷的降低，煙氣流量降低，催化劑區(qū)域溫度降低，***氫氨的形成可能增加。3***氫氨的控制～230℃之間的溫區(qū)位于空預(yù)器常規(guī)設(shè)計(jì)的冷段層上方和中間層下方，由于***氫氨在此溫區(qū)為液態(tài)向固態(tài)轉(zhuǎn)變階段，具有極強(qiáng)的吸附性，會(huì)造成大量灰分在空預(yù)器沉降，引起空預(yù)器堵塞及阻力上升，嚴(yán)重時(shí)將迫使停爐以清理空預(yù)器。同時(shí)，***氫氨或***氨本身對(duì)金屬有較強(qiáng)的腐蝕性，會(huì)造成催化劑金屬支撐架和空預(yù)器冷段腐蝕。因此必須嚴(yán)格控制氨泄漏量，一般要求小于3μL/L。當(dāng)反應(yīng)器入口管道設(shè)計(jì)不合理時(shí)，會(huì)引起反應(yīng)器截面上的NH3/NOx摩爾比、流量或溫度出現(xiàn)偏差。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="海南空氣預(yù)熱器生產(chǎn)廠家" src="http://tyunfile.71360.com/UploadFile/shbhjxsb/637220424328769531/3189655.jpg"></div><p> 達(dá)到破壞板片表面鈍化層的腐蝕條件。同時(shí)，由于此區(qū)域板片冷沖壓形成的內(nèi)部應(yīng)力較大，在表面鈍化層被破壞的情況下，內(nèi)部應(yīng)力作用導(dǎo)致應(yīng)力腐蝕的發(fā)生。處理方法：①更換有裂紋或穿孔板片，在現(xiàn)場(chǎng)用透光法查找板片裂紋。②調(diào)整運(yùn)行參數(shù)，使其達(dá)到設(shè)計(jì)條件。③換熱器維修組裝時(shí)夾緊尺寸應(yīng)符合要求，并不是越小越好。④板式換熱器板片材料合理匹配。壓降過(guò)大產(chǎn)生原因：①運(yùn)行系統(tǒng)管路未進(jìn)行正常吹洗，特別是新安裝系統(tǒng)管路中許多臟物（如焊渣等）進(jìn)入板式換熱器的內(nèi)部。由于板式換熱器流道截面積較窄，換熱器內(nèi)的沉淀物和懸浮物聚集在角孔處和導(dǎo)流區(qū)內(nèi)，導(dǎo)致該處的流道面積大為減小，造成壓力主要損失在此部位。②板式換熱器選型時(shí)面積偏小，造成板間流速過(guò)高而壓降偏大。③板式換熱器運(yùn)行一段時(shí)間后，因板片表面結(jié)垢引起壓降過(guò)大。實(shí)例：2000年我廠為新疆用戶提供了BR10型板式換熱器，用于水一水換熱的集中供熱系統(tǒng)，一次供水設(shè)計(jì)溫度為130℃。在換熱器設(shè)計(jì)選型時(shí)。傳熱導(dǎo)數(shù)偏高，接近5500w/(rn·K），而實(shí)際應(yīng)在3500w/(rn·K）。同時(shí)，設(shè)計(jì)單位在水泵選型時(shí)流量余量又偏大，造成換熱器二次側(cè)介質(zhì)板間流速超過(guò)1m/s，實(shí)際運(yùn)行壓降在～MPa，使得二次網(wǎng)水力平衡嚴(yán)重失調(diào)。</p></p><br /><p>文章來(lái)源地址: http://www.cdcfah.com/cp/295560.html</p></div></div></div></div></div><div id="qfcu3qk" class="page-right twoColRt"><div id="cmegda7" 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