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class="details_f"><p>[一]、改造為靜電袋式盆合除塵器<br/></p><p>靜電除塵器是一種新型的除塵裝置，它是靜電除塵器和袋式除塵器的有機結合，第為一電場的靜電除塵結構，后面為低壓脈沖袋式除塵結構。通過這兩種成熟可靠技術的有機申聯，它既能充分發揮靜電除塵器一電場具有收塵效率高的優點，又有袋式除塵單元捕集細微粉塵的優點。一電場的靜申徐塵單元能除去80-90%的粉塵，袋式除塵單元只需除去其余10一20%的粉塵。因此，袋式除塵單元的負荷大大降低，濾袋的過濾阻力減小、清灰時間間隔延長、濾袋使用壽命增加；同時可以買用較高的氣布比，濾袋的使用數量減少；粉塵荷電還可以使粉塵在濾袋表面凝并成為多孔晾的灰餅，大大提高濾袋對粒徑ion以下的細微顆粒物(PM10)捕集效率。同常規袋式除塵器相比，靜電袋式復合除塵器具有：過濾阻力小、投資運行成本低、對微細粉塵收集效率很高等優點。</p><p>在改造為靜電袋式復合除塵器時，可以保留原靜電除塵器的殼體、煙道、輸灰系統、進口煙箱和一電場，只需拆除二、三電場內部的陰陽極構件及槽板、高壓變壓器、進線、絕緣裝置以及出口煙箱和尾部煙道等。在原靜電除塵器一電場和二電場之間加裝煙氣分布和導流裝置，在其殼體內的二、三電場空間布置布袋及脈沖清灰系統，在原靜電除塵器的外殼頂部增設凈氣室，在凈氣室尾部設出口煙箱。</p><p>國外已經開始將靜電袋式復合除塵器應用于燃煤電廠。我國在這方面的研究工作起步較晚，要將該技術應用于燃煤電廠，目前仍需要解決的以下問題：(1)靜電除塵單元和袋式除塵單元之間的結合形式，結合間煙氣分配的均勻性問題：氣流的均勻性既影響靜電除塵單元的除塵效率，又影響袋式除塵單元中布袋的壽命。在大型靜電除塵器內煙氣通常為水平流動方式，而袋式除塵器傳統的進氣方式為下進氣。因此，需要采取適當的布風措施，既滿足煙氣在靜電除塵單元和袋式除塵單元都能均勻和合理分布，又盡量減少壓力損失。(2)靜電除塵單元電場和袋式除塵單元運行技術參數的合理選擇：復合除塵器內的運行條件等都發生很大的改變，因此除塵器的運行參數也要做相應的調整，特別是袋式除塵單元的噴吹壓力、清灰周期等參數需要重新選擇。</p><p>[二]、濕式靜電除塵器的故障類型及故障原因分析</p><p>1、故障類型</p><p>靜電除塵器配件在運行過程中的故障可歸為兩大類：電氣故障和運行不穩定造成的故障。土要表現有：(1)電源裝置送不上電；(2)運行中一次電壓、電流正常，但二次電壓升不起來；(3)運行中毫安表突然為零，電壓正常；(4)硅整流控制系統閃絡，放電頻繁，電源裝置頻繁跳閘；(5)絕緣了一箱溫度降低；(6)穿墻瓷套管和柱形絕緣子裂損；(7)電暈極折斷；(8)高壓硅整流管擊穿或可控硅損壞；(9)除塵器阻力過大；(10)爆炸引起設備重大損壞。</p><p>2、原因分析</p><p>1造成電氣故障的原因有：電器元件損壞，電暈極調整不到位，以及穿墻瓷套管和柱形絕緣子損裂等幾種。</p><p>1.1電器元件損壞，如：保險絲熔斷、高壓硅整流管擊穿或可控硅損壞均可導致送不上電；毫安表損壞或變壓器故障，貝口會出現故障類型(3)所發生的現象。</p><p>1.2未使用鎳鉻合金線，電暈極使用時間不長就會銹蝕折斷。電暈線松緊不勻，受力不均，個別電暈極負荷過大，也會造成電暈極折斷；電暈極安裝不到位，偏離沉淀管的中心，或積垢過多，會使電場頻繁閃絡，甚至運行中斷。</p><p>1.3若穿墻瓷套管和柱形絕緣子機械性能不過關，承受不了上下吊架的拉力，會出現裂損；絕緣子箱溫度控制不合理，溫度偏低或劇烈變化，也會使絕緣子裂損；絕緣子表面積垢過多，同樣使絕緣子裂損。然后結果是電場接地，電除塵器運行中斷，出現故障(2)和(4)所發生的現象。</p><p>2運行不穩定造成的故障原因有：絕緣子箱溫度控制不當；分氣格板堵塞，沉淀極積垢過厚；水膜調節不當；系統氧含量超標等幾種。</p><p>2.1蒸汽壓力不足，蒸汽管路堵塞，可使絕緣子箱溫度偏低。長此以往，絕緣子表面溫度偏低，積存焦油和塵粒，造成電場短路。若絕緣子箱升溫過快，或在運行中溫度變化劇烈，會導致絕緣子裂損。</p><p>2.2如果在運行中不能按要求進行間斷沖洗，沉淀管壁上積存的焦油難以得到較為徹底的清理，日積月累，不但造成設備運行阻力大，而比導致電場遭到破壞。</p><p>2.3在檢修時.沒按要求調整水膜.水膜不均勻或厚度不夠，投人運行后，就會出現故障(4)所述的現象。運行中水膜遭到破壞也會發生以上情況。</p><p>2.4電除塵器發生爆炸的原因是煤氣中氧含量超標，在設備內形成混合爆炸性氣體并比達到爆炸，遇到電火花而發生爆炸。</p><p><br/></p></div> 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