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mid="" deg='0'> <div id="fjpljtr" class="artview_content" style="display:block;font-family:Microsoft YaHei;font-size:12px;color:#5A5A5A;font-weight:normal;text-decoration:none;"> 眾所周知，通風(fēng)系統是工業(yè)建筑中必不可少的一部分，在我們日常生活中隨處可見(jiàn)，如地鐵、商場(chǎng)、工廠(chǎng)等，但通風(fēng)管道工程設計是一個(gè)系統而復雜的過(guò)程，許多人對此只有一個(gè)模糊的概念，因為它是一項非常專(zhuān)業(yè)的工程，下面就和大家一起學(xué)習通風(fēng)管道工程設計需要注意的問(wèn)題。 <div style="text-align:center;"> <img alt="" src="/datasy/editor/attached/image/20220509/20220509104937_79095.jpg" style="height:477px;width:400px;" /><br /> <p style="text-align:left;"> 在通風(fēng)管道工程設計過(guò)程中，涉及的計算主要包括通風(fēng)管道內的氣流阻力、通風(fēng)管道內的壓力分布、通風(fēng)管道的水力計算、均勻通風(fēng)管道的計算等。通過(guò)多年對通風(fēng)管道工程設計工程應用的研究和實(shí)踐分析，在通風(fēng)管道工程設計中應注意七個(gè)方面： </p> <p style="text-align:left;"> 1、通風(fēng)系統的劃分 </p> <p style="text-align:left;"> 不同地區的工業(yè)通風(fēng)系統對送風(fēng)和排風(fēng)有不同的要求。當區域較大時(shí)，相應的送風(fēng)和排風(fēng)點(diǎn)也較多，可分為多個(gè)送風(fēng)和排風(fēng)子系統，由一臺風(fēng)扇及其連接的管道組成，便于管理。系統劃分的依據主要為：生產(chǎn)工藝流程和運行時(shí)間相同的，建議劃分為一個(gè)系統；運行參數和空氣處理要求相同的，建議劃分為一個(gè)系統；位于風(fēng)機附近的排風(fēng)量較大的排風(fēng)點(diǎn)與遠處排風(fēng)量較小的排風(fēng)點(diǎn)不建議劃分為一個(gè)系統，這將增加排風(fēng)系統的阻力。另外，兩種或兩種以上有害物質(zhì)混合后能增加毒性和腐蝕性、容易引起火災和爆炸的，不能劃分為一個(gè)系統，建議單獨設置排風(fēng)系統。 </p> <p style="text-align:left;"> 2、通風(fēng)管道材質(zhì)的選擇 </p> <p style="text-align:left;"> 通風(fēng)管道的材質(zhì)主要有鋼板，金屬軟管、塑料和橡膠軟管，纖維板、膠合板、石膏板、硬聚氯乙烯塑料板，磚及混凝土等。鋼板是最常用的通風(fēng)管道材質(zhì)，主要是鋼板具有耐腐蝕、耐高溫等特點(diǎn)，且加工制作和安裝都很方便。有的通風(fēng)管道工藝上需要經(jīng)常移動(dòng)，該類(lèi)通風(fēng)管道需要金屬軟管、塑料和橡膠軟管等柔性材料制成。硬聚氯乙烯塑料板表面光滑、加工方便，但不耐高溫，適用于有腐蝕的工業(yè)通風(fēng)排氣系統。磚及混凝土等材質(zhì)制作的通風(fēng)管道主要適合與建筑等銜接的場(chǎng)合，阻力小，比較耐用?？傊?，通風(fēng)管道的材質(zhì)要根據應用場(chǎng)合等條件綜合選擇。 </p> <p style="text-align:left;"> <br /> 3、通風(fēng)管道斷面形狀的選擇 </p> <p style="text-align:left;"> 通風(fēng)管道斷面的形狀一般分矩形和圓形2種，在斷面積相同的情況下，圓形的通風(fēng)管道不僅阻力較小，強度大，也節省管材。對于圓形通風(fēng)管道來(lái)說(shuō)，直徑越小越容易制造，而且保溫也比較方便。但矩形通風(fēng)管道的管件制作比圓形通風(fēng)管道的制作要容易一些，且布置也比圓形通風(fēng)管道要簡(jiǎn)單。一般情況下，通風(fēng)管道截面較小而管中流速較高時(shí)，適合采用圓形通風(fēng)管道；通風(fēng)管道截面較大時(shí)，宜采用矩形通風(fēng)管道，還可以充分利用建筑空間。對于矩形通風(fēng)管道來(lái)說(shuō)，寬與高的比例越接近于1越好，不僅可以節省運行的動(dòng)力，還可以節省投資。 </p> <p style="text-align:left;"> 4、通風(fēng)管道的布置 </p> <p style="text-align:left;"> 通風(fēng)管道的布置直接關(guān)系到通風(fēng)系統的總體布置，要與其他專(zhuān)業(yè)緊密配合，不僅要協(xié)調美觀(guān)，還要符合總圖專(zhuān)業(yè)的各項規定。如果通風(fēng)管道的排氣點(diǎn)較多，可以用大截面的集合管連接各個(gè)支管；通風(fēng)管道的布置應盡可能直，以避免復雜的局部管件；如果輸送的氣體含有液滴，通風(fēng)管道應設置坡度，通風(fēng)管道的低點(diǎn)應設置水封管，以便排除積液；通風(fēng)管道上應設置調節和測量裝置，以方便系統的運行控制。 </p> <p style="text-align:left;"> 5、通風(fēng)管道的保溫 </p> <p style="text-align:left;"> 在通風(fēng)管道輸送空氣過(guò)程中，熱量和冷量的損耗都比較大，還要保持空氣溫度基本恒定，這就需要對通風(fēng)管道進(jìn)行保溫。通風(fēng)管道的保溫結構通常分為3個(gè)部分，即保溫層、防潮層和保護層。保溫層是通風(fēng)管道保溫的主要部分，防潮層主要用來(lái)防止水或蒸汽滲入保溫材料，保護層主要是用來(lái)保護保溫層和防潮層不受損傷。 </p> <p style="text-align:left;"> 6、通風(fēng)系統的進(jìn)風(fēng)口和排風(fēng)口 </p> <p style="text-align:left;"> 在通風(fēng)管道工程設計過(guò)程中，通風(fēng)系統的進(jìn)風(fēng)口應設置在空氣比較新鮮的地域，且要設置在排風(fēng)口的上風(fēng)向，高度要低于排風(fēng)口，同時(shí)要避免進(jìn)風(fēng)口和排風(fēng)口的短路。新污染源的排氣筒通常情況下不應低于15m。對于2個(gè)相同污染物的排氣筒，如果之間的距離小于其幾何高度之和，應該合并為1個(gè)等效排氣筒。排氣口排出的空氣通常含有害物質(zhì)，需要大氣擴散和稀釋。此時(shí)，排氣口應設置在建筑物氣流的負壓區和正壓區以上，無(wú)風(fēng)帽，防止雨水進(jìn)入通風(fēng)管道。 </p> <p style="text-align:left;"> 7、通風(fēng)系統的防火與防爆 </p> <p style="text-align:left;"> 在設計有火災和爆炸危險的通風(fēng)系統時(shí)，不僅要滿(mǎn)足風(fēng)量要求，還要設置可燃和爆炸物濃度檢測設施，選擇防爆風(fēng)機和防爆門(mén)，確?？扇己捅ㄎ镌谕L(fēng)管道中沒(méi)有死角。 </p> </div> </div> </div> </div> </div> <style type="text/css"> #site_footer{ position: relative!important; top: 200px!important; } </style> <div class="flnpppr" id="site_footer" style="width:1000px;position:absolute;height:123px;z-index:500;margin-top:0px"> <div id="rzfdffh" class="full_width" margintopheight="0" 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