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href="http://www.shubhyatraindia.com/static/css/jquery.jqzoom.css" /> <script type="text/javascript" src="http://www.shubhyatraindia.com/static/js/jquery.jqzoom-core.js"></script> <script type="text/javascript"> $(document).ready(function() { $('.jqzoom').jqzoom({ zoomType: 'standard', lens:true, preloadImages: false, alwaysOn:false, zoomWidth: 320, zoomHeight: 250 }); }); </script> <div class="product_detail" id="pd1"> <h6 style="text-align: center;"><strong>? <span style="font-size: 24px;color: #333">轉輪/蓄熱式（RTO）廢氣治理工程中電氣設計存在的問題</span></strong> <p class="smal-hide"><span>發布時間：2020-09-15 10:54</span> <span>點擊：<script src="/plus/count.php?view=yes&aid=2103&mid=1" type='text/javascript' language="javascript"></script></span></p> </h6> <div class="wznr"><div> <img alt="" src="/uploads/allimg/200915/1-20091511010bP.png" style="width: 750px; height: 314px;" /><br /> 1 轉輪/蓄熱式（RTO）廢氣治理工程中電氣設計存在的問題</div> <div> 1.1 超溫保護程序不完善</div> <div> 轉輪是 VOCs 濃縮裝置中的核心部件，由耐熱、耐溶劑性的密封材料分割成 3 個區域，連續運轉處理時，有三種不同風量、不同溫度的氣體同時通過，其中包含用于再生的高達180～220℃的高溫氣體。當轉輪在高溫脫附時，若設備異常緊急停車，未經過冷卻的孔道中，聚集的 VOCs 會和殘留的氧氣發生催化反應，放熱形成燜燃，*終釀成火災。目前轉輪控制主要采用PLC程序自動保護：當轉輪內部溫度超高時，PLC將進入停機降溫程序，利用吸附風對轉輪進行冷卻降溫。然而一旦PLC程序失控，高溫可能會進入核心設備，導致轉輪內部溫度超高致使燒毀，存在設備的安全隱患。</div> <div> 1.2 儀表、連鎖設施和控制不到位</div> <div> RTO設備的穩定運行離不開風機變頻器、控制儀表、設備檢測元件、執行機構等設備的正常運行，同時也包括燃燒室溫度與燃燒器連鎖控制、各組閥門之間的連鎖定時切換、燃燒室的壓力與風機的連鎖、閥門故障連鎖保護、系統斷電的連鎖保護等。RTO設備電氣控制的難度顯而易見。</div> <div> 壓縮空氣作為 RTO運行必須資源，維持各閥組的正常運行。當壓縮空氣故障時，現有程序主要由PLC程序立即執行緊急停機，關閉高溫取熱閥，使 RTO處于封閉靜置狀態，自然冷卻。但未考慮到一旦壓縮空氣的壓力過低時，RTO切換閥門無法及時動作到位，而脫附系統風機仍然運行，RTO爐膛內部的高溫熱量無法排除，存在內部壓力過高泄爆危險。另外，RTO在正常工作狀態時溫度高達 800℃，當出現廠區意外停電時，缺少備用電源情況下，PLC無法給執行設備輸出保護指令，也會使RTO和催化燃燒室處于危險狀態。</div> <div> 1.3 自動化程度不夠</div> <div> 雖然目前的電氣自動化程度已經很高，但還是存在有個別操作還沒有實現自動化。當 RTO設備運行出現故障或者設備必要參數不達標，工作人員無法第*時間獲取信息、采取有效措施處理。如燃燒機的點火是 RTO運行控制中不可忽視的一部分，燃燒機點火過程中連續點火失敗，燃燒機口將會存積大量天然氣，再次點火將會引起燃燒機口悶爆的危險?，F有程序反應是當檢測到燃燒機點火失敗后，PLC將進入停機降溫程序，需要依賴人工進行復位重啟。</div> <div> 2 電氣優化策略</div> <div> 2.1 完善超溫保護機制</div> <div> 為了防止高溫氣體對轉輪吸附材料的損毀，在原本單由PLC模塊保護轉輪的基礎上增加外部硬件實現雙重保護。轉輪配置一臺消防閥和一根帶開關量輸出觸點的溫度計，消防閥安裝在轉輪外殼頂部，介質采用氮氣做消防措施。當轉輪脫附溫度達到報警設定值 250℃時：關閉燃燒機加熱系統，程序自動進入停機降溫；當轉輪脫附溫度達到報警設定值 280℃時：關閉吸附閥門，停止吸附風機，防止轉輪空氣流通；當轉輪脫附溫度達到報警設定值 300℃時：溫度計自帶觸點吸合，打開消防閥，氮氣灌入轉輪降溫；PLC發出指令打開消防閥，氮氣灌入轉輪降溫。針對 RTO過來的熱源，在混流器出口至轉輪脫附區域段，新增一臺開關量 F3截止閥門（圖 1），在脫附入口管道增加配置一根帶開關觸點的限溫熱電阻。當 F1 高溫取熱閥出現故障后，PLC程序進入停機降溫，停止燃燒機，關閉 F3截止閥門，F2新風閥打開，利用新鮮空氣對 RTO冷卻降溫?；虍斆摳綔囟瘸^300℃時，觸點吸合，關閉 F3截止閥。<br /> <img alt="" src="/uploads/allimg/200915/1-200915110124223.png" style="width: 550px; height: 354px;" /></div> <div> 2.2 優化電氣配置</div> <div> 增加電氣模塊，提高自動化水平。在燃燒機控制器的配置上增加“遠程復位模塊”，當檢測到點火失敗信號后，PLC會對遠程復位模塊執行一次復位輸出指令，燃燒機控制器得到指令后將會再次執行一次點火動作，如果連續點火失敗次數大于 5 次，PLC將進入停機降溫程序：自動停止加熱系統，脫附管道閥門關閉，新風閥打開。增加連鎖控制，保證異常停機是閥門的正常動作。配置容量不小于 1m³的儲氣罐，供氣給 RTO切換閥組和其它氣動閥門。當前檢測到儲氣罐前端氣壓低故障信號后，儲氣罐仍然可以保證 RTO切換閥組能夠在一定時間內正常動作。程序將進入停機降溫：自動停止加熱系統，脫附管道閥門關閉，新風閥打開；降溫 20min 后，如果仍然檢測到氣壓低故障，程序將進入緊急停機：自動停止加熱系統，停止脫附系統風機，RTO切換閥組全部關閉。防止因壓縮空氣的壓力過低時，RTO切換閥門無法及時動作到位，導致 RTO爐膛高溫熱量下泄至氣缸提升閥處，損壞 RTO切換閥氣缸連桿執行器件、RTO下部外殼及保溫材料。</div> <div> 加強保證控制系統正常運行的措施。配置容量不小于6kVA的UPS存儲電源，供電于PLC控制系統和外排系統，當檢測到停電信號后，程序進入緊急停機，自動停止燃燒器，停止脫附系統風機，RTO切換閥組全部關閉，RTO處于靜置冷卻狀態；系統的外排閥門由 UPS電源供電強制打開狀態；無外排閥系統的設備強制打開吸附管道的相關閥門，保證生產車間通風順暢。UPS電源在廠區意外停電后，可以維持PLC控制系統一段時間。PLC程序可以輸出保護動作指令，HMI系統仍然可以監視設備儀器狀態，幫助操作員做出反應判斷。</div> <div> 2.3 建立無線遠程監控</div> <div> 對觸摸屏進行更新換代，選擇帶有手機軟件的觸摸屏，運用手機 App 與現場觸摸屏進行連接，實現在手機上實時監控設備的運行情況?；蛘呃?Android 手機平臺和 C#服務器網絡通訊對廢氣治理設備電氣控制進行遠程無線測控。</div> </div> <p id="cztz">版權聲明：本網注明來源為“環亞環?！钡奈淖?、圖片內容，版權均屬本站所有，如若轉載，請注明本文出處：http://www.shubhyatraindia.com 。同時本網轉載內容僅為傳播資訊，不代表本網觀點。如涉及作品內容、版權和其它問題，請與本網站聯系，我們將在及時刪除內容。</p> <p><br></p> <span class="czt"> <li id="tjyd"> 推薦閱讀：<a class="czt" href="/style/hyxw/2021/0628/2426.html">湖州市環境局用VOCs走航監測車發現企業VOCs廢氣直排，罰款超7萬</a> </li> </span> <div class="page" id="qhfy">上一篇：<a href='/style/hyxw/2020/0915/2102.html'>重點行業VOCs治理詳解之石化行業</a> 下一篇：<a href='/style/hyxw/2020/0915/2105.html'>國內主要省市大氣綜合排放標準制定情況匯總</a> </div> </div> <div class="czt">您可能喜歡：</div><br> <div class="czc"> <li 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