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<script>window._bd_share_config={"common":{"bdSnsKey":{},"bdText":"","bdMini":"2","bdPic":"","bdUrl":'http:///article/show/sid/1217/id/225.html',"bdStyle":"0","bdSize":"16"},"share":{}};with(document)0[(getElementsByTagName('head')[0]||body).appendChild(createElement('script')).src='http://bdimg.share.baidu.com/static/api/js/share.js?v=89860593.js?cdnversion='+~(-new Date()/36e5)];</script> </span> </div> <ul style=" margin:10px 0px;"> </ul> <div id="epo7iti" class="text editor">　　鍋爐燃料油的一個(gè)流量調(diào)節(jié)系統(tǒng)，流量指示出現(xiàn)上下波動(dòng)現(xiàn)象，不僅僅是測(cè)量問(wèn)題，還有系統(tǒng)問(wèn)題。將調(diào)節(jié)器由自動(dòng)切換成手動(dòng)，看流量指示變化情況。如流量指示仍然上下波動(dòng)，說(shuō)明是測(cè)量系統(tǒng)問(wèn)題。如流量指示不波動(dòng)，說(shuō)明是調(diào)節(jié)系統(tǒng)的問(wèn)題,可以通過(guò)改變P、I、D參數(shù)重新整定調(diào)節(jié)系統(tǒng)，但有時(shí)這種辦法不能解決問(wèn)題。<br /> <p> 　　針對(duì)鍋爐燃料油流量指示出現(xiàn)上下波動(dòng)故障現(xiàn)象，分析其原因，導(dǎo)壓管保溫系統(tǒng)的保溫棉外面沒(méi)有防濕措施，保溫層淋濕，熱量損失，使導(dǎo)壓管內(nèi)重油粘度增加，壓力傳遞阻力增加，反應(yīng)滯后。也就是說(shuō)，測(cè)量滯后增加。從物理意義上講，壓力傳遞阻力增加，反應(yīng)遲滯，孔板兩側(cè)的壓差變化不能及時(shí)傳到變送器上，使調(diào)節(jié)器不能對(duì)流量變化的信號(hào)進(jìn)行調(diào)節(jié)。如流量指示稍有下降，出現(xiàn)偏差，調(diào)節(jié)器隨即反應(yīng)，輸出一個(gè)調(diào)節(jié)信號(hào)，增加調(diào)節(jié)閥開度，流量很快達(dá)到設(shè)定值,現(xiàn)在測(cè)量出現(xiàn)滯后，流量變化了，但調(diào)節(jié)器不能立即做出反應(yīng)，流量繼續(xù)變化，待調(diào)節(jié)器做出反應(yīng)時(shí)，流量已大大地超過(guò)工藝指標(biāo)，再進(jìn)行反向調(diào)節(jié)，由于滯后太大而出現(xiàn)流量過(guò)小，這樣反復(fù)不止，使系統(tǒng)指示上下波動(dòng)。由于測(cè)量滯后過(guò)大，僅改變P、I、D參數(shù)不能克服。 </p> 　　應(yīng)打開鍋爐燃料油保溫蒸汽，使導(dǎo)壓管溫度上升，重油粘度降低，克服測(cè)量滯后，流量指示不再上下波動(dòng)，恢復(fù)正常，停止保溫伴熱蒸汽，在原保溫棉基礎(chǔ)上，加油氈，防止雨水。<br /></div> <div id="epo7iti" class="page" style="clear:both;"> 上一條： <a href="http:///xinwen/xwzx/show227.html">鍋爐燃料油維護(hù)哪些部件？</a> <br> 下一條： <a href="http:///xinwen/xwzx/show223.html">小技巧：環(huán)保燃料油泄露處理方法</a> <br> </div> <h4 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