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</span></p><p><span style="font-family: Arial;color: rgb(51, 51, 51);letter-spacing: 0;font-size: 13px;background: rgb(255, 255, 255)"><span style="font-family:宋體">國六柴油發(fā)動機普遍加裝了</span>DOC(<span style="font-family:宋體">氧化催化器</span><span style="font-family:Arial">)</span><span style="font-family:宋體">，</span><span style="font-family:Arial">DOC</span><span style="font-family:宋體">這個東西很多人都是頭一次聽說和頭一次見。今天我們就來聊聊</span><span style="font-family:Arial">DOC</span><span style="font-family:宋體">，看看它到底是個啥東西？</span></span></p><p style="text-align:center"><img src="/upload/202106/03/202106031341270759.jpeg" title="b151f8198618367a5ae334abaee104d1b21ce5f2.jpeg" alt="b151f8198618367a5ae334abaee104d1b21ce5f2.jpeg"/><span style="font-family: 宋體;color: rgb(51, 51, 51);letter-spacing: 0;font-size: 13px;background: rgb(255, 255, 255)"> </span></p><p style="text-align:center"><span style="font-family: 宋體;color: rgb(51, 51, 51);letter-spacing: 0;font-size: 13px;background: rgb(255, 255, 255)"> </span></p><p><strong><span style="font-family: Arial;letter-spacing: 0;font-size: 14px;background: rgb(255, 255, 255)">DOC<span style="font-family:宋體">結(jié)構(gòu)與工作原理</span></span></strong></p><p><strong><span style="font-family: Arial;letter-spacing: 0;font-size: 14px;background: rgb(255, 255, 255)"> </span></strong></p><p><span style="font-family: Arial;color: rgb(51, 51, 51);letter-spacing: 0;font-size: 13px;background: rgb(255, 255, 255)">DOC<span style="font-family:宋體">一般封裝在排氣管中，其結(jié)構(gòu)由蜂窩狀載體組成。載體一般都是陶瓷或金屬材料制成。載體表面涂覆有鉑系貴金屬，其作用有二：</span></span></p><p><span style="font-family: Arial;color: rgb(51, 51, 51);letter-spacing: 0;font-size: 13px;background: rgb(255, 255, 255)"> </span></p><p><span style="font-family: 宋體;color: rgb(51, 51, 51);letter-spacing: 0;font-weight: bold;font-size: 14px;background: rgb(255, 255, 255)">一、</span><strong><span style="font-family: Arial;color: rgb(51, 51, 51);letter-spacing: 0;font-size: 14px;background: rgb(255, 255, 255)"><span style="font-family:宋體">鉑金屬可以很好的吸附各種汽車尾氣排放氣體，包括沒有參與燃燒的氧氣。而氧是</span>DOC<span style="font-family:宋體">與后處理各部件</span><span style="font-family:Arial">“</span><span style="font-family:宋體">催化氧化</span><span style="font-family:Arial">”</span><span style="font-family:宋體">功能的核心。</span></span></strong></p><p><strong><span style="font-family: Arial;color: rgb(51, 51, 51);letter-spacing: 0;font-size: 14px;background: rgb(255, 255, 255)"><span style="font-family:宋體">二、鉑系金屬作為催化劑可以降低被氧化物的氧化溫度。</span></span></strong></p><p style="text-align:center"><img src="/upload/202106/03/202106031341556037.jpg" title="cdbf6c81800a19d8c6399296b3680d8ea71e4686.jpg" alt="cdbf6c81800a19d8c6399296b3680d8ea71e4686.jpg"/><strong><span style="font-family: 宋體;letter-spacing: 0;font-size: 14px;background: rgb(255, 255, 255)"><span style="font-family:宋體">、</span></span></strong></p><p style="margin-top:29px;margin-right:0;margin-bottom:0;margin-left:0;padding:0 0 0 0 ;line-height:19px"><strong><span style="font-family: Arial;letter-spacing: 0;font-size: 14px;background: rgb(255, 255, 255)">DOC<span style="font-family:宋體">的三大作用：</span></span></strong></p><p style="margin-top:18px;margin-right:0;margin-bottom:0;margin-left:0;padding:0 0 0 0 ;line-height:19px"><span style="font-family: Arial;color: rgb(51, 51, 51);letter-spacing: 0;font-size: 13px;background: rgb(255, 255, 255)">1.<span style="font-family:宋體">發(fā)動機燃燒后的氣體經(jīng)過</span><span style="font-family:Arial">DOC</span><span style="font-family:宋體">蜂窩狀載體的時候會被載體表面涂覆的鉑系金屬吸附，同時鉑系金屬作為催化劑與吸附的氧一起對于發(fā)動機尾氣中的一氧化碳和碳氫化合物氣體氧化燃燒，成為對環(huán)境影響不大的二氧化碳氣體與水。</span></span></p><p style="margin-top:18px;margin-right:0;margin-bottom:0;margin-left:0;padding:0 0 0 0 ;line-height:19px"><span style="font-family: Arial;color: rgb(51, 51, 51);letter-spacing: 0;font-size: 13px;background: rgb(255, 255, 255)">2.DOC<span style="font-family:宋體">作為主動再生時候的</span><span style="font-family:Arial">“</span><span style="font-family:宋體">爐子</span><span style="font-family:Arial">”</span><span style="font-family:宋體">起到點燃噴射到排氣管里面燃油的</span><span style="font-family:Arial">“</span><span style="font-family:宋體">重任</span><span style="font-family:Arial">”</span><span style="font-family:宋體">。為什么是</span><span style="font-family:Arial">DOC</span><span style="font-family:宋體">而不是其它部分呢？主要是</span><span style="font-family:Arial">DOC</span><span style="font-family:宋體">大量吸附儲存了發(fā)動機富氧燃燒后多余的氧氣，只有充足的氧氣才能保證再生功能穩(wěn)定持續(xù)地進行。</span></span></p><p style="margin-top:18px;margin-right:0;margin-bottom:0;margin-left:0;padding:0 0 0 0 ;line-height:19px"><span style="font-family: Arial;color: rgb(51, 51, 51);letter-spacing: 0;font-size: 13px;background: rgb(255, 255, 255)">3.DOC<span style="font-family:宋體">可以將發(fā)動機燃燒過后產(chǎn)生的一氧化氮</span><span style="font-family:Arial">(NO</span><span style="font-family:宋體">，氣體，屬于</span><span style="font-family:Arial">NOX</span><span style="font-family:宋體">其中的一部分</span><span style="font-family:Arial">)</span><span style="font-family:宋體">氧化為二氧化氮</span><span style="font-family:Arial">(NO2)</span><span style="font-family:宋體">，二氧化氮作為催化劑可以降低顆粒物燃燒溫度。這一點我們后面詳細講解。</span></span></p><p style="text-align:center"><img src="/upload/202106/03/202106031342182859.jpg" title="6a63f6246b600c339434c8989edede0ad8f9a1ac.jpg" alt="6a63f6246b600c339434c8989edede0ad8f9a1ac.jpg"/><strong><span style="font-family: 宋體;letter-spacing: 0;font-size: 14px;background: rgb(255, 255, 255)"> </span></strong></p><p style="margin-top:29px;margin-right:0;margin-bottom:0;margin-left:0;padding:0 0 0 0 ;line-height:19px"><strong><span style="font-family: Arial;letter-spacing: 0;font-size: 14px;background: rgb(255, 255, 255)"><span style="font-family:宋體">看的是不是有點頭暈？下面具體解讀。</span></span></strong></p><p style="margin-top:18px;margin-right:0;margin-bottom:0;margin-left:0;padding:0 0 0 0 ;line-height:19px"><span style="font-family: Arial;color: rgb(51, 51, 51);letter-spacing: 0;font-size: 13px;background: rgb(255, 255, 255)"><span style="font-family:宋體">國六階段對于發(fā)動機做功時候沒有充分燃燒的可燃氣體需要在</span>DOC<span style="font-family:宋體">里面再次燃燒，這需要氧氣和足夠的溫度。而</span><span style="font-family:Arial">DOC</span><span style="font-family:宋體">里面鉑金屬吸附和儲存了足夠的氧，并且鉑金屬可以降低可燃氣體對于溫度的要求</span><span style="font-family:Arial">(</span><span style="font-family:宋體">可以低溫燃燒</span><span style="font-family:Arial">)</span><span style="font-family:宋體">。這是</span><span style="font-family:Arial">DOC</span><span style="font-family:宋體">功能之一。</span></span></p><p style="margin-top:18px;margin-right:0;margin-bottom:0;margin-left:0;padding:0 0 0 0 ;line-height:19px"><span style="font-family: Arial;color: rgb(51, 51, 51);letter-spacing: 0;font-size: 13px;background: rgb(255, 255, 255)"><span style="font-family:宋體">不管是康明斯燃油后噴再生還是如錫柴</span>“<span style="font-family:宋體">第七噴油器</span><span style="font-family:Arial">”</span><span style="font-family:宋體">，燃油在到達</span><span style="font-family:Arial">DOC</span><span style="font-family:宋體">遇到富氧與催化劑的雙重作用在適當?shù)臏囟认聲×胰紵艧?。如果說</span><span style="font-family:Arial">DOC</span><span style="font-family:宋體">是</span><span style="font-family:Arial">“</span><span style="font-family:宋體">爐子</span><span style="font-family:Arial">”</span><span style="font-family:宋體">的話，那么</span><span style="font-family:Arial">DPF</span><span style="font-family:宋體">就是</span><span style="font-family:Arial">“</span><span style="font-family:宋體">爐子</span><span style="font-family:Arial">”</span><span style="font-family:宋體">上面的</span><span style="font-family:Arial">“</span><span style="font-family:宋體">鍋</span><span style="font-family:Arial">”</span><span style="font-family:宋體">。</span></span></p><p style="margin-top:18px;margin-right:0;margin-bottom:0;margin-left:0;padding:0 0 0 0 ;line-height:19px"><span style="font-family: Arial;color: rgb(51, 51, 51);letter-spacing: 0;font-size: 13px;background: rgb(255, 255, 255)">DPF<span style="font-family:宋體">這口</span><span style="font-family:Arial">“</span><span style="font-family:宋體">鍋</span><span style="font-family:Arial">”</span><span style="font-family:宋體">的溫度可以達到</span><span style="font-family:Arial">650°</span><span style="font-family:宋體">。高溫條件下可以徹底的將碳顆粒物燒得干干凈凈。這是</span><span style="font-family:Arial">DOC</span><span style="font-family:宋體">功能之二！</span></span></p><p style="text-align:center"><img src="/upload/202106/03/202106031342329708.jpg" title="d788d43f8794a4c2ba5728738f6694d0ac6e398e.jpg" alt="d788d43f8794a4c2ba5728738f6694d0ac6e398e.jpg"/><strong><span style="font-family: 宋體;letter-spacing: 0;font-size: 14px;background: rgb(255, 255, 255)"> </span></strong></p><p><strong><span style="font-family: Arial;color: rgb(51, 51, 51);letter-spacing: 0;font-size: 14px;background: rgb(255, 255, 255)"><span style="font-family:宋體">說點題外話：這么高的溫度對于燒小油產(chǎn)生的硫覆蓋的清除與再生是福還是禍需要大量的應(yīng)用才能知道結(jié)果。</span></span></strong></p><p style="text-align:center"><img src="/upload/202106/03/202106031342481459.jpg" title="6a63f6246b600c339434c8989edede0ad8f9a1ac.jpg" alt="6a63f6246b600c339434c8989edede0ad8f9a1ac.jpg"/><strong><span style="font-family: 宋體;color: rgb(51, 51, 51);letter-spacing: 0;font-size: 14px;background: rgb(255, 255, 255)"> </span></strong></p><p style="margin-top:29px;margin-right:0;margin-bottom:0;margin-left:0;padding:0 0 0 0 ;line-height:19px"><span style="font-family: Arial;color: rgb(51, 51, 51);letter-spacing: 0;font-size: 13px;background: rgb(255, 255, 255)"><span style="font-family:宋體">碳顆粒物完全氧化需要</span>600℃<span style="font-family:宋體">的高溫，而正常運轉(zhuǎn)時候</span><span style="font-family:Arial">DPF</span><span style="font-family:宋體">過濾器內(nèi)的溫度是</span><span style="font-family:Arial">350℃</span><span style="font-family:宋體">，這個溫度無法使碳顆粒物進行燃燒。</span></span></p><p style="margin-top:18px;margin-right:0;margin-bottom:0;margin-left:0;padding:0 0 0 0 ;line-height:19px"><span style="font-family: Arial;color: rgb(51, 51, 51);letter-spacing: 0;font-size: 13px;background: rgb(255, 255, 255)"><span style="font-family:宋體">因此，只能利用排氣管噴射柴油或噴油器后噴射將</span>DPF<span style="font-family:宋體">過濾器加熱到</span><span style="font-family:Arial">600℃</span><span style="font-family:宋體">以上，以使碳顆粒物燃燒。如果頻繁使用噴射柴油燃燒會增加很多油耗成本。</span></span></p><p style="margin-top:18px;margin-right:0;margin-bottom:0;margin-left:0;padding:0 0 0 0 ;line-height:19px"><span style="font-family: Arial;color: rgb(51, 51, 51);letter-spacing: 0;font-size: 13px;background: rgb(255, 255, 255)"><span style="font-family:宋體">有沒有什么辦法能夠利用正常運轉(zhuǎn)時候的尾氣溫度來進行再生呢？研究人員著重對與碳顆粒物同樣通過氧化催化器</span>(DOC)<span style="font-family:宋體">進入</span><span style="font-family:Arial">DPF</span><span style="font-family:宋體">過濾器的二氧化氮進行了研究，發(fā)現(xiàn)二氧化氮具有奇妙的性質(zhì)。</span></span></p><p style="margin-top:18px;margin-right:0;margin-bottom:0;margin-left:0;padding:0 0 0 0 ;line-height:19px"><span style="font-family: Arial;color: rgb(51, 51, 51);letter-spacing: 0;font-size: 13px;background: rgb(255, 255, 255)"><span style="font-family:宋體">這個性質(zhì)就是二氧化氮可作為催化劑，使碳顆粒物在</span>250℃<span style="font-family:宋體">以上的相對低溫下進行氧化。幸運的是，尾氣中含有二氧化氮。</span></span></p><p style="margin-top:18px;margin-right:0;margin-bottom:0;margin-left:0;padding:0 0 0 0 ;line-height:19px"><span style="font-family: Arial;color: rgb(51, 51, 51);letter-spacing: 0;font-size: 13px;background: rgb(255, 255, 255)"><span style="font-family:宋體">而且，正常運轉(zhuǎn)條件下</span>DPF<span style="font-family:宋體">過濾器的溫度可以達到</span><span style="font-family:Arial">350℃</span><span style="font-family:宋體">，所以，完全無需從外部加熱，利用二氧化氮催化劑僅用發(fā)動機廢氣熱量即可使碳顆粒物燃燒。</span></span></p><p style="text-align:center"><img src="/upload/202106/03/202106031343080025.jpeg" title="4afbfbedab64034f1f9a77eed051f6340b551d1e.jpeg" alt="4afbfbedab64034f1f9a77eed051f6340b551d1e.jpeg"/><strong><span style="font-family: 宋體;color: rgb(51, 51, 51);letter-spacing: 0;font-size: 14px;background: rgb(255, 255, 255)"> </span></strong></p><p style="margin-top:29px;margin-right:0;margin-bottom:0;margin-left:0;padding:0 0 0 0 ;line-height:19px"><span style="font-family: Arial;color: rgb(51, 51, 51);letter-spacing: 0;font-size: 13px;background: rgb(255, 255, 255)"><span style="font-family:宋體">也就是說，</span>DOC<span style="font-family:宋體">將來自于發(fā)動機的氮癢化物</span><span style="font-family:Arial">(NOX)</span><span style="font-family:宋體">其中所含的一氧化氮氧化為二氧化氮，二氧化氮氣體作為一種腐蝕性氣體是極好的氧化劑，它可以作為助燃劑與</span><span style="font-family:Arial">DPF</span><span style="font-family:宋體">配合工作，僅需正常行駛即可，無需任何操作就能在低溫條件下將顆粒物氧化燃燒。</span></span></p><p style="margin-top:18px;margin-right:0;margin-bottom:0;margin-left:0;padding:0 0 0 0 ;line-height:19px"><span style="font-family: Arial;color: rgb(51, 51, 51);letter-spacing: 0;font-size: 13px;background: rgb(255, 255, 255)"><span style="font-family:宋體">通過以上措施，顆粒捕捉器可再生處理發(fā)動機排出的</span>90<span style="font-family:宋體">％以上的顆粒物。</span></span></p><p style="margin-top:18px;margin-right:0;margin-bottom:0;margin-left:0;padding:0 0 0 0 ;line-height:19px"><span style="font-family: Arial;color: rgb(51, 51, 51);letter-spacing: 0;font-size: 13px;background: rgb(255, 255, 255)"><span style="font-family:宋體">這就是被動再生的機理！也是</span>DOC<span style="font-family:宋體">功能之三！</span></span></p><p style="text-align:center"><img src="/upload/202106/03/202106031343231425.jpg" title="cb8065380cd79123bb488eef2da6d687b3b7801c.jpg" alt="cb8065380cd79123bb488eef2da6d687b3b7801c.jpg"/><strong><span style="font-family: 宋體;color: rgb(51, 51, 51);letter-spacing: 0;font-size: 14px;background: rgb(255, 255, 255)"> </span></strong></p><p style="margin-top:18px;margin-right:0;margin-bottom:0;margin-left:0;padding:0 0 0 0 ;line-height:19px"><span style="font-family: Arial;color: rgb(51, 51, 51);letter-spacing: 0;font-size: 13px;background: rgb(255, 255, 255)"><span style="font-family:宋體">旋轉(zhuǎn)慣性式空氣濾清器通過進氣旋轉(zhuǎn)的方法可以過濾掉</span>85<span style="font-family:宋體">％的灰塵顆粒物。剩下的</span><span style="font-family:Arial">15</span><span style="font-family:宋體">％才是需要紙濾芯過濾的。</span></span></p><p style="margin-top:18px;margin-right:0;margin-bottom:0;margin-left:0;padding:0 0 0 0 ;line-height:19px"><span style="font-family: Arial;color: rgb(51, 51, 51);letter-spacing: 0;font-size: 13px;background: rgb(255, 255, 255)"><span style="font-family:宋體">同樣道理，在</span>DPF<span style="font-family:宋體">再生的過程中</span><span style="font-family:Arial">90</span><span style="font-family:宋體">％的顆粒物是需要在我們正常行駛的時候燃燒掉。而燃燒這</span><span style="font-family:Arial">90</span><span style="font-family:宋體">％的顆粒物是不需要多消耗我們一丁點燃油，也不需要我們特意去管它，被動再生省油，省精力。</span></span></p><p style="margin-top:18px;margin-right:0;margin-bottom:0;margin-left:0;padding:0 0 0 0 ;line-height:19px"><span style="font-family: Arial;color: rgb(51, 51, 51);letter-spacing: 0;font-size: 13px;background: rgb(255, 255, 255)"><span style="font-family:宋體">只有</span>10<span style="font-family:宋體">％無法被動再生的顆粒物需要電腦或我們手動干預(yù)去燃燒再生！電腦或人干預(yù)就是主動再生！主動再生需要額外消耗燃油！</span></span></p><p style="text-align: center;"><img src="/upload/202106/03/202106031343402955.jpg" title="11385343fbf2b2119ed9f8694a12ea3d0dd78ebd.jpg" alt="11385343fbf2b2119ed9f8694a12ea3d0dd78ebd.jpg"/><strong><span style="font-family: 宋體;color: rgb(51, 51, 51);letter-spacing: 0;font-size: 14px;background: rgb(255, 255, 255)"> </span></strong></p><p style="margin-top:29px;margin-right:0;margin-bottom:0;margin-left:0;padding:0 0 0 0 ;line-height:19px"><span style="font-family: Arial;color: rgb(51, 51, 51);letter-spacing: 0;font-size: 13px;background: rgb(255, 255, 255)"><span style="font-family:宋體">與進氣濾清器一樣，</span>DOC<span style="font-family:宋體">在使用中也有一些必須注意的問題！</span><span style="font-family:Arial">DPF</span><span style="font-family:宋體">被動再生需要足夠的催化劑</span><span style="font-family:Arial">(</span><span style="font-family:宋體">二氧化氮</span><span style="font-family:Arial">)</span><span style="font-family:宋體">，如果</span><span style="font-family:Arial">DOC</span><span style="font-family:宋體">表面被小油燃燒后的硫覆蓋就不能產(chǎn)生足夠的催化劑供</span><span style="font-family:Arial">DPF</span><span style="font-family:宋體">被動再生。</span></span></p><p style="margin-top:18px;margin-right:0;margin-bottom:0;margin-left:0;padding:0 0 0 0 ;line-height:19px"><span style="font-family: Arial;color: rgb(51, 51, 51);letter-spacing: 0;font-size: 13px;background: rgb(255, 255, 255)"><span style="font-family:宋體">如果采用以前的老辦法特意小油門，排氣溫度不達標</span>DPF<span style="font-family:宋體">也不能正常被動再生。當長時間不能被動再生的時候，只能多消耗燃油主動再生或者進服務(wù)站花錢處理了！</span></span></p><p style="margin-top:18px;margin-right:0;margin-bottom:0;margin-left:0;padding:0 0 0 0 ;line-height:19px"><span style="font-family: Arial;color: rgb(51, 51, 51);letter-spacing: 0;font-size: 13px;background: rgb(255, 255, 255)"><span style="font-family:宋體">這就是國六</span>DOC<span style="font-family:宋體">的全部故事！</span></span></p><p><strong><span style="font-family: 宋體;color: rgb(51, 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