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id="zoom">　　《工業(yè)循環(huán)冷卻水處理設計規范》（GB50050）對冷卻水系統中腐蝕速度，污垢熱阻，異養菌數和粘泥量的要求。<br /> 　　敞開(kāi)式循環(huán)冷卻水系統中換熱設備的碳鋼管壁的腐蝕速度小于0.125 mm/a （5mpy）銅，銅合金和不銹鋼管壁的腐蝕速度宜小于0.005mm/a（0.2mpy）<br /> 　　一、腐蝕監測<br /> 　　冷卻水系統中，常用的腐蝕監測方法主要是試片法，試片法是冷卻水系統中最簡(jiǎn)便、最經(jīng)濟、使用最廣泛和最經(jīng)典的腐蝕監測方法。它可以測定腐蝕速度、蝕孔密度、蝕孔深度，并了解腐蝕形態(tài)。<br /> 　　1. 試片材質(zhì)：碳鋼試片，黃銅試片。<br /> 　　2. 試片的安裝：試片應安裝在監測的換熱器設備的回水管線(xiàn)上。也可放在冷卻塔集水池中。<br /> 　　3. 監測時(shí)間：試片的監測時(shí)間一般為30——90天，30天取一次。每月測定一次腐蝕速度。最后繪出腐蝕速度——時(shí)間曲線(xiàn)。<br /> 　　4測定前的試片處理：將試片表面的腐蝕產(chǎn)物清洗干凈，經(jīng)干燥后稱(chēng)重精確到0.1 mg<br /> 　　5腐蝕速度的測定：<br /> 　　由試片的總表面積、金屬的密度、試驗時(shí)間、試片的失重，按下面兩個(gè)計算式計算出金屬的腐蝕速度：<br /> 　　腐蝕速度=87.6ΔW/（spt） mm/a<br /> 　　腐蝕速度=3449ΔW/（spt）mpy<br /> 　　式中：ΔW——試片的失<br /> 　　重 mg<br /> 　　s—— 試片的總表面積 m2<br /> 　　p—— 金屬的密度 g/cm3（碳鋼7.85 黃銅8.50 不銹鋼7.92）<br /> 　　t—— 監測時(shí)間 h<br /> 　　二、污垢——沉積物的監測<br /> 　　冷卻水系統中沉積物的現場(chǎng)監測主要是測定由水垢、淤泥、腐蝕產(chǎn)物和微生物粘泥等沉積物引起的污垢熱阻或壓力降，以及由冷卻水在熱交換器中產(chǎn)生的沉積物量，沉積物層厚度及其組成等。目前，常用的沉積物現場(chǎng)監測的方法有：監測換熱器法，電熱式污垢監測儀法，壓力降法，鈣離子濃度法。<br /> 　　1.熱換器法：用監測換熱器監測冷卻水系統中沉積物，將運行一定時(shí)的監測換熱器拆開(kāi)，將其換熱管（試驗管）剖開(kāi)，觀(guān)察其中污垢沉積情況，測定析出的沉積物層厚度。<br /> 　　2常用的鈣離子濃度法：可以通過(guò)測定補充水和循環(huán)水中鈣離子的濃度。按照循環(huán)冷卻水運行的濃縮倍數，考察循環(huán)水中鈣離子的濃度是否按濃縮倍數成比例地增加來(lái)判斷冷卻水系統中的結垢情況。如果循環(huán)冷卻水中鈣離子的濃度沒(méi)有按濃縮倍數計算那樣增加，而是小于該計算值，則此時(shí)冷卻水系統中可能會(huì )產(chǎn)生結垢或鈣鹽的沉積；反之，則冷卻水系統中不會(huì )產(chǎn)生結垢或鈣鹽的沉積。</div> </div> <div id="pldfhzfvxp" class="fenyefh"><a href="javascript:history.go(-1);" title="返回" >[返回]</a></div> <div id="pldfhzfvxp" class="fenyeud">上一條：<a href='http://www.www.yarnsonfirst.com/news_view.php?id=38' title="循環(huán)水處理難題及解決策略">循環(huán)水處理難題及解決策略</a></div> <div id="pldfhzfvxp" class="fenyeud">下一條：<a href='http://www.www.yarnsonfirst.com/news_view.php?id=36' title="我國水處理藥劑的現狀及發(fā)展戰略">我國水處理藥劑的現狀及發(fā)展戰略</a></div> </div> </div> <div id="pldfhzfvxp" class="pmain-b 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