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bgff p12"> <div class="subject"> <div class="position">當前位置：<a href="/">首頁</a> > <a href="/html/xinwendongtai/" title="新聞動態">新聞動態</a> > <a href="/html/huabaike/" title="溴化鋰百科">溴化鋰百科</a></div> <b>溴化鋰百科</b> </div> <div class="artshow"> <h1 class="title">溴化鋰水循環系統的化學除垢與清洗方法</h1> <div class="info">發布時間：2022-7-22 9:27:56　瀏覽次數：<span id="hits">0</span></div> <div class="content infoimg"> <p>溴化鋰吸收式制冷機組是以熱能作為動力，以水為制冷劑，<a href="http://www.1810you.com/html/huarongyejizaisheng/" title="溴化鋰溶液" target="_blank" class="sitelink">溴化鋰溶液</a>為吸收劑，制取高于0oc的冷量，作為空調或生產工藝過程的冷源。溴化鋰吸收式制冷機組由于其本身耗電少、無毒、無污染、無爆炸危險、安全可靠，被譽為無公害的制冷設備。機組運行和維護中常見的問題</p><p>溴化鋰吸收式制冷機過冬措施我國大部分地蒸汽式或熱水式溴化鋰制冷機組經常一年之中實際運行僅一一個季度，其余時間大多處于停機狀態。如對停機的制冷機組不采取保養檢查維修措施，則制冷機組的損害程度會增加，輕則其制冷量衰竭加快，重則制冷機組有可能在3—5年內報廢，因此加強溴化鋰吸收式制冷機的冬季保養是十分必要的。</p><p> 溴化鋰制冷機在使用過一段時間后，常會在冷凝器和吸收器中產生結垢，水系統滋生藻類進而產生粘泥，機組出現嚴重銹蝕等問題，這就需要運用清洗技術對其進行維修保養。</p><p>1. 溴化鋰冷水機組水循環系統的化學除垢與清洗</p><p>溴化鋰冷水機組有兩路水循環系統：冷媒水系統和冷卻水系統。冷媒水系統一般是密閉循環，水量幾乎沒有損失，所以它存在的主要問題是鐵銹、滋生藻類、產生粘泥影響傳熱等。冷卻水系統除上述問題外，還有冷卻塔的水分蒸發導致無機鹽濃度升高產生結垢的問題。無論是粘泥還是結垢，都增加了換熱銅管熱阻，降低傳熱效率，使得吸收式制冷機組的制冷能力下降。資料表明，冷卻水污垢系數由0．000086m2K／w 增加到0．000172mzK／W 和0．000344m2K／W時，機組制冷量將衰減11％和26％左右；冷媒水污垢系數由0．000086m2K／w 增加到0．000172m2K／W時，機組制冷量將下降8％左右；所以應定期對水系統加以清洗和投放化學藥劑。尤其是使用地下水的地區，水的硬度較高，結垢的現象更為突出，有的機組運行數月就會有魚鱗般的垢層產生。需要注意的是，機組冷卻水側和冷媒水側，每年在停機期間應進行認真清洗，對各種過濾網、管道和閥門定期清洗與檢查，以保障良好的供熱效果和循環水量。如果可能，冷卻水側和冷媒水側進口處應設置過濾網，以防止較大的雜物進入機組。在機組清洗完畢后，為防止再次發生結垢現象，需要針對實際水質情況，優選配方，定期投加化學藥劑，提高對溴化鋰吸收式制冷機組的管理水平。</p><p>2. 溴化鋰制冷機組的內部化學清洗</p><p> 溴化鋰溶液在有氧存在的情況下對鋼鐵腐蝕性較強，這也是對溴化鋰制冷機組真空度要求較高的原因之一。此外，機組正常維修要充氮氣隔絕空氣，暴氣維修時間不宜超過6小時，越短越好。由于多方面的原因，一有漏泄，制冷機組內部極易出現腐蝕，產生的銹渣又可能堵塞濾網和噴嘴。所以需要采取化學清洗方法，對制冷機組內部進行清洗維護。</p><p>3. 溴化鋰溶液的再生處理</p><p> 溴化鋰溶液的pH值、酸堿值和鉻酸鋰緩蝕劑的濃度應在維護中做定期檢測。當溴化鋰制冷機組經過長期運行，溶液內容易生成大量的沉淀物和鉻合物，降低機組的制冷效率，減少制冷機組的制冷量。故有必要對溴化鋰溶液進行再生處理，以提高制冷量，降低設備故障率和延長機組使用壽命。溴化鋰溶液的再生方法有以下幾種 L5J：① 將溶液從機組中抽出，置于大型容器中，經沉淀吸取容器上部的清液，拋棄沉在底部的殘液，達到清除沉淀物之目的(但溶液長時間暴露于大氣環境中)；</p><p>使用過濾網對溶液進行過濾(但溶液長時間暴露于大氣環境中)；</p><p> 制冷系統內安裝再生裝置，使污濁的溴化鋰溶液可在制冷系統內真空條件下進行再生處理，并充分發揮制冷系統中原有設備的功能，使用方便，省時有效，可隨時再生溶液，清除沉淀物，保證溶液通暢循環。</p><p>在對溴化鋰制冷機組進行內部化學清洗和再生處理操作中，應注意如下幾點：各屏蔽泵及濾網應在酸洗過程結束后進行水洗的過程中拆開清洗，去掉濾網上的雜質；</p><p>采用鈍化水而不是磷化主要是考慮到機組內不僅有鐵質材料還有銅質材料，鈍化液充注量應比機組正常充液多一些；</p><p> 化學藥劑對環境有一定的污染，能回收的應盡量回收，需排放的應作好排污工作；</p><p>使用化學藥劑，在操作過程中應注意安全，采取必要的防護措施，由專職人員操作。</p><p>4. 傳熱管破裂的處理</p><p> 蒸發器傳熱管在制冷機組運行過程中常會出現凍裂，這是當系統的冷媒水斷水后，操作人員未能及時發現，制冷機繼續運轉，使得積存在蒸發器傳熱管內的冷媒水溫度不斷下降，直至結冰而使管子，凍裂。制冷系統的傳熱管發生凍裂，輕微時可能是一根或數根，嚴重時則可出現數十根或數百根同時凍裂，造成較大的經濟損失，應在機組運行時特別注意。避免傳熱管凍裂的根本措施是加強運轉管理，運轉期間機房值班人員應時常觀察各有關運轉參數的變化情況，一旦出現異樣征兆，例如由于冷媒水斷水而出現系統保護裝置動作、報警電鈴響等情況，立即關閉供熱。當傳熱管出現破裂時，由于冷媒水已灌人機內，溴化鋰溶液的濃度急劇下降，同時，制冷機真空度下降，制冷能力消失。因此如發生傳熱管破裂的事故，一般應請專業制造廠或維修部門進行專業修復。</p><p>但在修復前，必須主動采取隔絕空氣漏人機內的措施，將泄漏部位與環境空氣相通處封死。</p><p>5. 真空度的保持</p><p> 溴化鋰吸收式制冷機是在高真空度下工作的，蒸發器、吸收器中的絕對壓力只有幾毫米汞柱，外部空氣極易泄人，在運行過程中不可避免產生不凝性氣體。即使數量極微也會極大地損害機組的性能，在1臺制冷量為2267．85 kW的機組中加入3O克氮氣(G =9．5％)后，制冷量減少一半，僅有1163 kW；而且隨著不凝氣體的增加，機組的性能將被完全破壞，無法正常運行。因此，真空度是衡量制冷機性能的重要參數。要想機組正常運行，首先必須保證機組真空度，無論是運行還是停機保養，真空度應視為機組的生命線，定人定機進行檢查。一臺合格的優良的制冷機要求達到30Pa的絕對壓力，24小時壓力回升不超過20Pa。如果達不到，就必須檢查。如果充氮保養也要求N2的純度。只有這樣，才能減緩機組腐蝕和制冷性能下降。</p> <div class="list_page page_group"> <ul> </ul> </div> </div> <div class="pn"> <div class="pre">上一篇： <a href="/html/huabaike/490.html" title="溴化鋰制冷機維修出現電路故障該怎么處理">溴化鋰制冷機維修出現電路故障該怎么處理</a> </div> <div class="next">下一篇：沒有了</div> <a class="back" href="/html/huabaike/">返回</a> </div> </div> <div class="clear"></div> </div> <div class="clear"></div> </div> </div> <div class="h0"></div> <div class="nav-f-sub"> <div class="w"> <ul> <h2><a href="/list.asp?classid=12">關于我們</a></h2> <li><a href="/html/gongsijianjie/">公司簡介</a></li> <li><a href="/html/qiyewenhua/">企業文化</a></li> <li><a href="/html/zizhirongyu/">資質榮譽</a></li> </ul> <ul> <h2><a href="/html/chanpinzhongxin/">產品中心</a></h2> <li><a href="/html/zhilengjiweixiu/">制冷機維修</a></li> <li><a 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