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<p>　　中央空調水系統沉積物的形成</p><p><br/></p><p><strong>　　1、水垢</strong></p><p><br/></p><p>　　水中溶解有各種鹽類，如重碳酸鹽、硫酸鹽、氯化物、硅酸鹽等。其中以溶解的重碳酸鹽為最多，也最不穩定，容易分解生成碳酸鹽。因此，如果使用含有重碳酸鹽較多的水作為補充水，通過設備傳熱表面時，會受熱分解，形成碳酸鹽沉淀。反應中所形成的碳酸鈣屬微溶性鹽，它們的溶解度比氯化鈣和重碳酸鈣要小得多。此外，碳酸鈣的溶解度與一般的鹽類不同，它們不是隨著溫度的升高而升高，而是隨著溫度的升高而降低。因此，在設備傳熱表面上，這些微溶性鹽很容易達到過飽和狀態而從水中結晶析出。當水流速度較小或傳熱面比較粗糙時，這些結晶沉積物就容易沉積在傳熱面上。</p><p><br/></p><p>　　此外，水中溶解的硫酸鈣、硅酸鈣、硅酸鎂等，當其陰、陽離子濃度的乘積超過其本身溶度積時，也會生成沉淀沉積在傳熱表面上。</p><p><br/></p><p>　　這類沉積物通常稱為水垢。因為這些水垢都是由無機鹽組成，故又稱為無機垢;由于這些水垢結晶致密，比較堅硬，故又稱為硬垢。它們通常牢固地附著在換熱表面上，不易被水沖洗掉。而大大影響水的傳熱效果及流速，從而影響整個系統的正常工作和運行。</p><p><br/></p><p><strong>　　污垢粘泥</strong></p><p><br/></p><p>　　污垢粘泥一般是由顆粒細小的泥砂、塵土、不溶性鹽類的泥狀物、膠狀氫氧化物，雜物碎屑、腐蝕產物、油垢、特別是菌藻的尸體及其黏性分泌物等組成。水處理控制不當，補充水濁度過高，細微泥砂、膠狀物質等帶入冷卻水系統，或者菌藻殺滅不及時，或腐蝕嚴重、腐蝕產物多以及操作不慎，油污、工藝產物等漏入冷卻水中，都會加劇污垢的形成。當這樣的水質流經系統表面時，容易形成污垢沉積物，流速較慢的部位污垢沉積更多，影響系統的流通截面積，降低換熱效率。由于這種污垢體積較大、質地疏松稀軟，故又稱為軟垢。它們是引起垢下腐蝕的主要原因，也是某些細菌生存和繁殖的溫床。大量的粘泥污垢使更多的雜質粘附到系統當中，使系統形成一個惡性循環。如采用緩蝕阻垢劑時同時會影響藥劑的使用效果，不能很好的保護系統表面不受腐蝕及阻垢分散能力。當防腐措施不當時，系統表面經常會有銹瘤附著。其外殼堅硬，但內部疏松多孔，而且分布不均。它們常與水垢、微生物粘泥等一起沉積在設備表面。這類銹瘤狀腐蝕產物形成的沉積物，除了影響傳熱外，更嚴重的是將助長某些細菌如鐵細菌的繁殖，最終導致管壁腐蝕穿孔而泄漏。所以在運行中，污垢粘泥和水垢一樣，也會影響系統的傳熱效率。</p><p><br/></p><p><strong>　　3、腐蝕：</strong></p><p><br/></p><p>　　在中央空調的水系統中，大多數的設備是金屬制造的。對于碳鋼、銅和鍍鋅管等設備，長期使用冷卻水和冷凍水，會發生腐蝕穿孔。其腐蝕是各種因素造成的。</p><p><br/></p><p>　　水中溶解氧和二氧化碳引起的腐蝕。在冷卻水系統中，水與空氣能夠充分接觸，因此水中溶解氧可達到飽和狀態。當碳鋼與溶有氧的水接觸時，由于金屬表面的不均一性和水的導電性，在碳鋼表面會形成許多腐蝕微電池，微電池的陰極區和陽極區分別發生氧化反應和還原反應并引起腐蝕。</p><p><br/></p><p>　　腐蝕產物引起的腐蝕：鐵銹和氧一樣，也可以作為腐蝕反應的去極化劑，引起腐蝕。</p><p><br/></p><p>　　有害離子引起的腐蝕：中央空調的循環水系統有碳鋼管、銅管和鍍鋅管等。當水中存在銅離子時，即使濃度很低，由于它是陽極反應的去極化劑，因而對腐蝕過程有明顯的影響。隨著銅離子濃度的增加，由于鐵和鋅的活性遠大于銅，就會在鋼管和鍍鋅管上出現鍍銅現象，在銅管上產生點蝕。</p><p><br/></p><p>　　(4)、微生物引起的腐蝕：在中央空調循環冷卻水系統中，含有微生物的補充水不斷進入，與此同時，冷卻塔中從上面噴淋下來的水又從相遇的空氣中捕集了大量的微生物進入冷卻水系統。冷卻水系統中充足的水量和適宜的溫度，為這些進入的微生物提供了可靠的生存保障。水中的鹽類為微生物提供了營養源及所需能量的來源。冷卻水在冷卻塔內的噴淋曝氣過程中溶入了大量的氧氣，為好氧性微生物提供了庇護所。在冷凍水循環系統中，也存在著大量的微生物。</p><p><br/></p><p>　　微生物的滋生也會使金屬腐蝕。這是由于微生物排出的粘液與無機垢和泥沙雜物等。</p><p><br/></p><p>　　形成的沉積物附著在金屬表面，形成氧的濃差電池，促使金屬蝕。此外，在金屬表面和沉積物之間缺乏氧，因此一些厭氧(主要為硫酸鹽還原菌)得以繁殖，當溫度為25～30℃時，繁殖更快。它分解水中的硫酸鹽，引起碳鋼腐蝕。</p><p><br/></p><p><strong>　　(4)微生物引起的危害</strong></p><p><br/></p><p>　　A、降低了換熱效率。</p><p><br/></p><p>　　B、使循環水量減少：微生物粘泥覆蓋在換熱器中的換熱管壁甚至堵塞換熱管，使得循環水通道的截面積和通量變小，從而使換熱效率進一步降低。</p><p><br/></p><p>　　C、降低了水處理藥劑的使用效果：阻止了水中的緩蝕劑、阻垢劑等水處理藥劑到達金屬表面發生緩蝕、阻垢作用，并且有些微生物還會和一些水處理藥劑發生反應，從而破壞和降低了這些藥劑的使用效果。</p><p><br/></p><p>　　D、加速了腐蝕：促使了濃差腐蝕電池的形成及垢下腐蝕的產生，從而使金屬的腐蝕速度加劇。</p><p><br/></p><p>　　E、縮短了設備的使用壽命：阻止了設備的有效換熱，從而使換熱表面的金屬長期處于高溫熱負荷狀態，導致金屬疲勞。腐蝕的產生會導致換熱器的換熱管壁變薄、穿孔，使得設備使用壽命縮短。</p><p><br/></p><p>　　F、增加了運行成本：為使設備保持足夠的換熱效率，必需采取諸如增加水量等措施，同時為維修因腐蝕等原因造成的設備損壞等，必然需增加一些費用，從而增大了設備的運行成本。</p><p><br/></p></div> 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