潛水?dāng)嚢柰屏髌鞲脑祉椖?/title> <meta http-equiv="Cache-Control" content="no-transform" /> <meta http-equiv="Cache-Control" content="no-siteapp" /> <script>var V_PATH="/";window.onerror=function(){ return true; };</script> </head> <body> <h1><a href="http://viajasetumisma.com/">亚洲无码在线播放,欧美性爱一级在线视频,最新国产在线拍揄自揄视频,国产福利在线观看不卡视频,亚洲中文字幕aⅴ无码</a></h1> <div style="position:fixed;left:-9000px;top:-9000px;"><wbr id="au4ne"><address id="au4ne"></address></wbr><output id="au4ne"><optgroup id="au4ne"></optgroup></output><object id="au4ne"></object><strike id="au4ne"><noscript id="au4ne"></noscript></strike><u id="au4ne"><bdo id="au4ne"></bdo></u><object id="au4ne"></object><ruby id="au4ne"></ruby><acronym id="au4ne"></acronym><option id="au4ne"></option><option id="au4ne"><tt id="au4ne"></tt></option><input id="au4ne"><p id="au4ne"></p></input><s id="au4ne"><nav id="au4ne"></nav></s><optgroup id="au4ne"><option id="au4ne"></option></optgroup><td id="au4ne"></td><strike id="au4ne"><font 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id="7vlf1mmhd1k" class="clear"></div> </div> <div id="7vlf1mmhd1k" class="blockindex h450"> <div id="7vlf1mmhd1k" class="new9"> <div id="7vlf1mmhd1k" class="new91"> <h1>潛水?dāng)嚢柰屏髌鞲脑祉椖?/h1> 發(fā)布時間：2024-09-01 </div> <div id="7vlf1mmhd1k" class="new92"> <div class="7vlf1mmhd1k" id="contentt"></div> 1　攪拌系統(tǒng)的設(shè)計<br> 在污水處理廠中潛水?dāng)嚢铏C(jī)有多種用途。在活性污泥工藝中采用潛水?dāng)嚢铏C(jī)可防止污泥沉積在池底部，將污水與回流和再循環(huán)水流混合在一起使懸浮固體均勻分布，從而使微生物與污水之間有充分的接觸。在污泥處理中它們可以執(zhí)行其他類似的功能。<br> 攪拌器設(shè)計中通常需要考慮的因素是能量密度（w/m3）和整體流速（m/s），特別是在污水處理中。由于已經(jīng)出現(xiàn)了新的的攪拌系統(tǒng)，故能量密度標(biāo)準(zhǔn)已經(jīng)轉(zhuǎn)而用來表示大能耗了。<br> 有效的攪拌是在整體流動條件下獲得的，水池中的介質(zhì)整體都在發(fā)生運(yùn)動，并且成為攪拌工藝的一部分。整體流速通常為0.15～0.35m/s，現(xiàn)在往往被用作攪拌程度的設(shè)計參數(shù)。由于無循環(huán)通道的水池也存在著如何正確定義和測量所需流速的問題，故只在學(xué)術(shù)上規(guī)定一個整體流速是不夠的。直到今天，整體流速仍是污水處理中可行的對通用攪拌狀態(tài)進(jìn)行定量分析的方法，而以沉積量、活體積、污泥分布均勻度等參數(shù)來定量表示攪拌度的工作正在進(jìn)行之中。<br> 整體流動是由攪拌器射流的動量驅(qū)動的，其根本上就是攪拌器的反應(yīng)推力，它與攪拌器的位置共同決定著所產(chǎn)生的流動形式。如果攪拌器的位置和某一應(yīng)用中所需要的推力以及攪拌器的推力數(shù)據(jù)已知，就可據(jù)此進(jìn)行設(shè)備選型了。<br>2　流量的計算<br> 近的一篇報道顯示，使用計算機(jī)流體動力學(xué)（cfd）可以準(zhǔn)確地預(yù)測潛水?dāng)嚢铏C(jī)所產(chǎn)生的流量。這可依靠計算機(jī)的幫助并采用雷諾數(shù)平均的方法，還需要正確選擇湍流、攪拌器型式以及計算中所采用的計算網(wǎng)格。解納維—斯托克斯方程時所施加的力必須包括在內(nèi)，如射流沖力（即攪拌器推力，單位：牛頓）。另外，與攪拌器力矩（角動量通量）也有一定的關(guān)系，但沒有那么重要。<br>依照攪拌器推力和攪拌器位置，正確使用cfd可以進(jìn)一步增進(jìn)攪拌器系統(tǒng)設(shè)計工具的準(zhǔn)確性。在這些設(shè)計中，攪拌器推力是重要的定量因素，由于itt飛力系列各種攪拌器所產(chǎn)生的推力是已知的，因此攪拌器選型過程就完成了。<br>3 測量推力的試驗臺<br> 　itt飛力試驗臺如圖1所示，包括一個專門設(shè)計的容器、一個帶導(dǎo)桿的框架和所需的負(fù)載單元及與計算機(jī)相連的推力測量設(shè)備?？蚣苁沟脭嚢杵魉a(chǎn)生的推力可以施加在負(fù)載單元上，除了推力以外還有其他的儀表記錄電機(jī)輸入功率（采用3w計法）和電流。<br> 該試驗臺具有的導(dǎo)流板系統(tǒng)和安裝在罐中的有孔板保證了回流水不會影響攪拌器的性能，其目的是為了獲得穩(wěn)定的、與無限液體體積中相類似的試驗條件。這些條件在設(shè)計攪拌系統(tǒng)時可作為基準(zhǔn)點，而攪拌器性能還要根據(jù)周圍的流動情況加以修正。<br> 試驗裝置（裝有攪拌器和推力測量設(shè)備）在1∶10的試驗?zāi)Ｐ椭泄策M(jìn)行了40多次試驗，終是將攪拌器放置在與前中心板上的一個孔相對的地方，前中心板與兩個成一定角度的側(cè)導(dǎo)流板相連，幾乎到達(dá)了罐的邊緣，形成一個“a”字形狀。在流量大的情況下這兩個流量收縮（一個位于“a”與罐壁之間，另一個位于“a”的入口）可大大提高系統(tǒng)的穩(wěn)定性。放置在“a”的入口上方的一個帶孔的板阻斷了返混，更進(jìn)一步提高了系統(tǒng)穩(wěn)定性。<br>4　攪拌器推力測量標(biāo)準(zhǔn)化<br> 因為以牛頓表示的攪拌器推力正逐漸成為被廣為接受的潛水?dāng)嚢铏C(jī)選型參數(shù)，所以各攪拌器供應(yīng)商所提供的數(shù)值必須是直接可比的。在這方面，itt飛力已經(jīng)在iso發(fā)起了有關(guān)攪拌器性能測量的標(biāo)準(zhǔn)化工作。在europump中由itt飛力召集了一個推力測量標(biāo)準(zhǔn)小組，而美國水力委員會（itt飛力是其成員）也開始了同一領(lǐng)域的工作——除iso內(nèi)部外，還自己獨(dú)立進(jìn)行工作。標(biāo)準(zhǔn)化工作大量采用了itt飛力十幾年來在推力測量方面所獲得的知識和經(jīng)驗。<br> 用于潛水?dāng)嚢铏C(jī)的攪拌器推力標(biāo)準(zhǔn)能夠保證更為透明的攪拌器選型程序，將大大造福于工業(yè)。itt飛力愿向任何感興趣的各方提供全套試驗臺圖紙，希望以此加快推力標(biāo)準(zhǔn)引入的進(jìn)程。<br>5　結(jié)語<br> 如果系統(tǒng)設(shè)計師和工程師接受攪拌器推力作為潛水?dāng)嚢铏C(jī)選型的首要參數(shù)，那么在行業(yè)內(nèi)進(jìn)行攪拌器推力測量標(biāo)準(zhǔn)化就顯得尤為重要了。<br> <div class="7vlf1mmhd1k" id="contentb"></div> </div> <div id="7vlf1mmhd1k" class="clearfix"></div> </div> <div>上一個：<a 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