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<div class="content" style="width:963px;margin:0;padding:0;"> <div class="news_xaingxi"> 换热器清‹z—的必要性浅æž?</div> <div class="news_author"> 来源åQšwww.ijaqqxs.cn 发表旉™—´åQ?020-07-07 </div> <div class="news_content" style="width:935px;margin:0 auto;padding:0;"> <p>所有类型的热交换器¾lè¿‡é•¿æ—¶é—´çš„˜qè¡ŒåQŒä¸å¯é¿å…ä¼šå‡ºçŽ°¾l“垢、锈蚀½{‰é—®é¢˜ï¼Œå…¶ä¸»è¦åŽŸå› å®ƒä»¬å‡æ˜¯åº”自来水作为工作媒介的åQŒåœ¨å¤–界条äšgåQˆå¦‚温度、流速、浓度)改变æ—Óž¼Œæ°´è´¨å¤šè¡¨çŽîCؓ不稳定的状态,会äñ”生结垢、腐蚀、生物粘泥等现象ã€?br />  1、结åž?br />  沉积物及垢类在却水系¾lŸä¸­æ‰€æº¶è§£çš„重酸式盐浓度随着蒸发‹¹“度而增加,当其‹¹“度辑ֈ°è‡³é«˜é™åº¦çŠ¶å†µåQŒæˆ–者在¾lè¿‡æ¢çƒ­å™¨çš„传热表面使水温升高时åQŒæ°´ä¸­ç›ä»½æº¶è§£åã^衡遭到破坏,会äñ”生下面列反应åÏx°´åž¢çš„生成åQšCaåQˆHCO3åQ?=CaCO3+CO2+H2OåQŒäñ”生的CaCO3水垢沉积在换热器的热传表面,形成一层硬垢,使设备的导热性能极差åQŒä¸¥é‡åª„响换热效率,其次水系¾lŸè®¾å¤‡ã€ç®¡é“主要材质是¼„³é’¢åQŒå…¶è…åŒ–产物主要是氢氧化物以及铁氧化物的水化物,呈胶体状åQŒç¨³å®šçš„悬æÕQ于水中,但当通过热交换器是易在受热面胶体ç›æ€º’凝集沉淀åQŒæ²‰æ·€ç‰©ä¸»è¦æ˜¯Fe2O3åQŒå› ä¸ºFe2O3的不˜qžç®‹æ€§ä»¥åŠä¸è‡´å¯†æ€§è€Œå¯¹é‡‘属无保护效用,而因为它的磁性、粘附力å¼ÞZ¸”比重大,清除困难åQŒåŞ成污垢;另外åQŒè½®å›žæ°´ä¸­ä¹Ÿæœ‰å¤©ç„¶æœ‰æœºç‰©ã€æƒ”沙、微生物½{‰æ‚¬‹¹®ç‰©åQŒä»–们于‹¹é€Ÿæ…¢è€Œæ¸©åº¦é«˜çš„地æ–ÒŽ…¢æ…¢æ²‰¿U¯è€ŒåŞ成污垢沉¿U¯åœ¨è®‘Ö¤‡ã€ç®¡é“表面,此类污垢一般比较疏松,易用水冲‹z—清除ã€?br />  2、腐蚀<br />  ¼„³é’¢æè´¨ä¸Žæ°´ä¸­çš„氧气起反应而发生腐蚀åQŒå…¶ååº”如下åQšFe+O2+H2O=FeåQˆOHåQ?。水在浓¾~©è¿‡½E‹ä¸­åQŒå„¿Uç›¾cȝš„‹¹“度相应增加åQŒå½“Cl以及SO4¼›Õd­‹¹“度较高æ—Óž¼Œä¼šä‹É金属表面的保护膜的防腐性能降低ž®¤å…¶æ˜¯Cl¼›Õd­åŠå¾„ž®ã€ç©¿é€æ€§å¼ºåQŒå®¹æ˜“粉¼„Žç®€˜q°è¡¨é¢çš„保护膜增加其腐蚀反应的阳极过½E‹é€Ÿåº¦åQŒè‹±æ°”金属的局部腐蚀åQŒä¸¤¿Uå·®åˆ«çš„金属接触æ—Óž¼Œå› é‡‘属间电位差而造成甉|± è…èš€åQŒä¾‹å¦‚热交换器的通关和碳钢端板,其接触部分的钢铁材质会因此加速腐蚀。水中微生物的滋生也会äñ”生球菌性腐蚀åQŒå¦‚¼‹«é…¸˜q˜åŽŸèŒã€é“çƒèŒ½{‰ã€‚其他引赯‚…èš€çš„媄响因素有åQšPH倹{€æº¶è§£çš„气体、温度、流速等ã€?br />  3、微生物<br />  水系¾lŸä¸­çš„微生物可分为球菌、真菌及è—ȝ±»åQŒå› ä¸ºå…¶æ•£å¸ƒåœ¨å¤©ç„¶ç•Œå„个加罗åQŒè€Œé•¿æœŸæœªæ¸…洗处理的水¾pȝ»Ÿä¸­ï¼Œå…¶ç›åˆ†ã€PH倹{€æº¶è§£æ°§½{‰æ¯”例适合微生物生ŒD–,若未能得到有效控åˆÓž¼Œå¾®ç”Ÿç‰©ä¸æ–­æ»‹ç”Ÿï¼Œòq¶åˆ†æ³Œå‡ºå¤§é‡¾_˜æ¶²åQŒå°†æ°´ä¸­ä¸æº¶æ€§æ‚质粘¾l“在一èµøP¼Œäº§ç”Ÿ¾_˜æƒ”附着于设备以及管道的内表面,é˜È¢æ°´çš„‹¹åŠ¨ä»¥åŠ¾pȝ»Ÿçƒ­äº¤æ¢ï¼Œä¸”在¾_˜æƒ”沉积的地方往往会造成沉积物下腐蚀<br />  ¾lég¸Šæ‰€˜q?nbsp;     <br />  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