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class="c_portalResNews_detail-01001"> <div id="0ixuono" class="demo"> <div id="0c00rx5" class="container">  <div id="oo51his" class="p_NewsDetail">  <h1 class="title-box">SCR脫硝催化劑為什么需要更換？ </h1>  <div id="l0dbmco" class="picBox">  <div id="okknnon" class="swiper-container pic-top"> <div id="ecxjl0s" class="swiper-wrapper"> <div id="d506owr" class="swiper-slide"> <a class="ahref" href="" target="_blank"> <img src="/upload/s.png" lazy-src="http://img601.yun300.cn/repository/image/4887c7cf-8cec-44ff-b0ce-b351aed14cc5.png_{i}xaf.png?tenantId=288018&viewType=1" class='pic' title='' alt='' /> </a> <div id="qfqrtbr" class="content"> <div id="0mow010" class="e_box p_textBoxs btn-ic"> <h4 class="picTitle"></h4> <p class="picSummary"></p> </div> </div> </div> </div>  <div id="bdbypkw" class=" button1 button-next1 swiper-button-white"> <i class="iconfont btn-ic1"></i> </div> <div id="fo5fr66" class=" button1 button-prev1 swiper-button-white"> <i class="iconfont btn-ic1"></i> </div>  <div id="o056kwn" class="swiper-pagination pagination"></div> </div>  <div id="0j51sxl" class="small-pic-box"> <div id="pu01bef" class="swiper-container pic-bottom"> <div id="gergiag" class="swiper-wrapper"> <div id="mz51msi" class="swiper-slide smSlide"> <div id="j0mhqmh" class="p_sImgBox"> <img src="/upload/s.png" lazy-src="http://img601.yun300.cn/repository/image/4887c7cf-8cec-44ff-b0ce-b351aed14cc5.png_{i}xaf.png?tenantId=288018&viewType=1" class='smPic' title='' alt= /> </div> </div> </div> </div>  <div id="ccnm5bt" class="button2 button-next2 swiper-button-white"> <i class="iconfont btn-ic2"></i> </div> <div id="5t01vun" class=" button2 button-prev2 swiper-button-white"> <i class="iconfont btn-ic2"></i> </div> </div> </div>  <article class="summary"> <div id="0v56lzw" class="lead"> <p>　　催化劑在活性穩定期間接觸少量雜質(zhì)而使活性顯著(zhù)下降，使催化劑活性中心發(fā)生化學(xué)反應稱(chēng)為化學(xué)中毒，催化劑表面被覆蓋或者堵塞被稱(chēng)為物理中毒！</p> <p>　　1、物理中毒的常見(jiàn)現象</p> <p>　?、俅呋瘎┑哪p</p> <p>　　實(shí)際運行過(guò)程中空氣空氣流量大、流速高，因此高溫煙氣會(huì )造成催化劑表面煙氣磨損甚至損失，同時(shí)在催化劑的安裝和更換過(guò)程中導致結構受到損傷！活性成分主要集中在表面的催化劑，受磨損后活性影響較大。影響磨損的因素有煙氣流速、飛灰特性、沖擊角度和催化劑本身特性等。避免反應器局部出現高流速區，設計煙氣流動(dòng)的線(xiàn)速度為6m/s以?xún)取?/p> <p>　?、诳變榷氯?/p> <p>　　催化劑的堵塞分為孔堵塞和通道堵塞！孔堵塞主要是銨鹽及飛灰的小顆粒引起的。銨鹽是有SO2氧化生成的SO3與SCR系統中噴入的過(guò)剩NH3產(chǎn)生反應生成的化合物NH4HSO4和（NH4）2SO4，通常硫酸銨的沉積現象可通過(guò)提高溫度來(lái)消除。集聚在催化劑表面的飛灰最終形成搭橋造成催化劑堵塞，這類(lèi)堵塞可通過(guò)減少催化劑層疊區和優(yōu)化流態(tài)設計來(lái)減少倒流現象，或加裝吹灰器減少飛灰的沉積?？傊?，煙氣中銨鹽、細小顆粒及煙氣中粉塵沉積在催化劑小微觀(guān)孔道中，阻礙了NOX、NH3、O2到達催化劑表面，引起鈍化，導致催化劑活性降低。</p> <p>　?、?ldquo;覆蓋層”中毒</p> <p>　　“覆蓋層”中毒是指煙氣飛灰中AL2O3、SiO2等沉積在催化劑表面，導致催化劑表面微孔發(fā)生“堵塞”現象，從而阻礙NOX與NH3在催化劑表面發(fā)生SCR發(fā)應。此外，飛灰中CaO沉積在催化劑表面，容易與SO3反應生成CaSO4,阻礙NOX與NH3結合，導致催化劑中毒。</p> <p>　?、艽呋瘎Y</p> <p>　　燒結也是催化劑失活的重要原因之一。對于應用在燃氣鍋爐的催化劑，經(jīng)過(guò)長(cháng)時(shí)間運行后，燒結和銳鐵礦TiO2金紅石化是其主要失活機理。一般在煙氣溫度高于400℃時(shí)，燒結就開(kāi)始發(fā)生。對于常規催化劑，當煙氣溫度低于420-430℃，催化劑燒結速度處于可以接受的范圍；當煙氣溫度高于450℃，催化劑的壽命就會(huì )在較短時(shí)間內大幅度降低。</p> <p>　　2、催化劑化學(xué)中毒</p> <p>　　燃煤煙氣飛灰中含有大量的堿金屬（如Na、K等）、堿土金屬元素（如Ca和Mg）、磷（P）和砷（As),使得SCR催化劑用于燃煤、生物質(zhì)等鍋爐煙氣處理時(shí)存在明顯的化學(xué)中毒現象。</p> <p>　?、賶A金屬中毒</p> <p>　　飛灰中的堿金屬（如Na、K等的氧化物）存在于生物質(zhì)電廠(chǎng)、垃圾焚燒廠(chǎng)和燃煤電廠(chǎng)的尾氣中，這個(gè)商用VWTi催化劑的使用帶來(lái)困難，而對于燃油鍋爐的SCE催化劑，堿金屬中毒被公認為是最重要的。在SCR反應過(guò)程中和催化劑表面活性位的發(fā)生結合，在占據活性位的同時(shí)中和催化劑表面活性位的酸性，從而影響還原劑NH3的吸附，導致催化劑失活。</p> <p>　?、阝}中毒</p> <p>　　我國的煤中CaO含量相對較高，CaO的堿性使得催化劑酸性下降和生成CaSO4，使得活性下降。</p> <p>　?、鬯嵝晕镔|(zhì)（S、CL、P等）中毒</p> <p>　　SO2會(huì )在釩基催化劑的作用下被氧化成SO3，并造成金屬活性硫酸化，阻礙催化劑活性組分的氧化還原循環(huán)過(guò)程；除此之外，SO2還會(huì )與NH3形成（亞）硫酸銨等覆蓋催化活性位。這就是NH3-SCR催化劑的SO2中毒。</p> <p>　?、苤亟饘偕?、鉛等中毒</p> <p>　　煤炭中砷的含量變化很大，一般3-45mg/kg，煤中砷多數以硫化砷或六神鐵礦等形式存在，小部分為有機物形態(tài)。</p> </div> </article>   <div id="oign0vl" class="e_box d_pcDom p_PrevAndNext " data-ename="上一篇、下一篇信息區"> <div id="rggixl5" class="e_box p_previewBox"> <span id="et6za0b" class="i_title"><span id="0j0pq01" class="i_pageUpTitle">上一個(gè)</span> <span id="e5anyun" class="clons">: </span> </span> <a href="/news/9.html" 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