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　　當含水、硫化鐵粉末等粉塵或其他雜質(zhì)的天然氣流經(jīng)<strong>電磁流量計</strong>時(shí)，由于雜質(zhì)的長(cháng)期存在，得以在流量計的探頭部位和流量計表體管道內壁不斷積累，形成一層覆蓋層，影響電磁的發(fā)送效率和相關(guān)計量數據，從而出現電磁流量計計量的不穩定性。<div>　　液體<strong>電磁流量計</strong>是利用超聲脈沖在氣流中傳播的速度與氣流的速度有對應的關(guān)系，即順流時(shí)的超聲脈沖傳播速度比逆流時(shí)傳播的速度要快，這兩種超聲脈沖傳播的時(shí)間差越大，則流量也越大的原理。在實(shí)際工作過(guò)程中，處在上下游的換能器將同時(shí)發(fā)射電磁脈沖，顯然一個(gè)是逆流傳播，一個(gè)是順流傳播。氣流的作用將使兩束脈沖以不同的傳播時(shí)間到達接收換能器。由于兩束脈沖傳播的實(shí)際路程相同，傳輸時(shí)間的不同直接反映了液體流速的大小。這種方法稱(chēng)為速度時(shí)間差法。由于<strong>電磁流量計</strong>采用數字時(shí)間差法檢測液體的流量。</div><div>　　當有粉塵層存在時(shí)，相當于縮小了管道內壁直徑D，也使電磁發(fā)射和接收之間的距離L偏小，順流和逆流傳播時(shí)間也都偏小，由于電磁的速度基本恒定，L和時(shí)間的偏離是等比例的。實(shí)際的管道內徑和實(shí)際的反射長(cháng)度要小于正常工作時(shí)的管道內徑和超聲反射距離?？墒橇髁坑嬎銠C在計算流量時(shí)，依然以正常的管道內徑和反射距離來(lái)計算，可以得知，會(huì )使得測得的液體平均流速偏大。同時(shí)由于管道內徑D大于管道實(shí)</div><div>　　際內徑，流量計算機所計算出的瞬時(shí)流量也就偏大。尤其是在管道內徑較小時(shí)，這種影響尤為明顯。</div><div>　　另外，由于粉塵在管道內積聚時(shí)并不能形成平滑如管壁的積聚層，有較大的不確定性和粗糙度，同時(shí)，在大輸量下管道存在一定的振動(dòng)，更加劇了這種不確定性的頻繁波動(dòng)，所以這種計量偏離也是不確定的，這就出現了所說(shuō)的數據漂移現象。例如我單位某站數據漂移現象時(shí)，瞬時(shí)流量的波動(dòng)并不是長(cháng)期固定在某個(gè)值，而是頻繁波動(dòng)，但是波動(dòng)方向卻是一致的，均是偏大。</div> </div> <div id="ft33fd9" class="ly_PrevNext"> <ul> <li>上一篇：<a href="/Article-1573083.html">工業(yè)在線(xiàn)PH計的特性</a></li> <li>下一篇：<a href="/Article-1564278.html">電磁流量計對不同混合液體的測量方式</a></li> </ul> </div> </div>   <div id="hzb8r3d" class="ly_foot"> <div id="x89fmel" class="ly_Ftmain"> <div id="9vmokcz" class="ly_FtLeft"> <div id="i3kqx8v" class="Ft_nav"><a href="/">首頁(yè)</a><a href="/aboutus.html" target="_blank">關(guān)于我們</a><a href="/products.html" target="_blank">產(chǎn)品展示</a><a href="/news.html" target="_blank">新聞中心</a><a href="/article.html" target="_blank">技術(shù)文章</a><a href="/honor.html" target="_blank">榮譽(yù)資質(zhì)</a></div> 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