袋式除塵器高溫技術措施
袋式(shi)除塵器高溫技術措施(shi)介(jie)紹(shao)如下(xia)：
1、高溫涂
用于(yu)高(gao)溫(wen)煙氣的袋式(shi)除塵器防(fang)腐涂(tu)裝是不(bu)可(ke)缺少(shao)的。因為涂(tu)裝不(bu)良(liang)，不(bu)僅影響美(mei)觀，而(er)且會加快腐蝕降低除塵器的使(shi)用壽命。
2、采用耐(nai)高溫除塵(chen)布袋(dai)：耐(nai)高溫濾袋(dai)品種很多，應用較(jiao)廣(guang)，如Nomex、美(mei)塔斯(si)、Ryton、P84、玻纖氈、泰氟隆、Kerme等。對(dui)于高溫干燥的(de)氣體可用Nomex等，如果煙(yan)氣中(zhong)含(han)有(you)一定量的(de)水分或煙(yan)氣容易(yi)結(jie)露則(ze)必須選用不發生水解的(de)耐(nai)高溫濾布如P84等。
3、保溫措施
除塵器的(de)灰斗不論怎樣組(zu)織氣流(liu)都難免產生氣流(liu)的(de)停滯(zhi)，所以(yi)在(zai)設計中采取了保(bao)溫措(cuo)施。保(bao)溫層結構按防止結露計算。
4、濾(lv)袋(dai)口形式
用脈沖袋(dai)(dai)式(shi)除(chu)塵器處理高溫(wen)(wen)(wen)煙氣時，必須防止(zhi)濾(lv)袋(dai)(dai)口(kou)的(de)局(ju)部冷卻結露(lu)(lu)。清灰(hui)用的(de)壓(ya)(ya)縮空(kong)(kong)氣溫(wen)(wen)(wen)度(du)較(jiao)低(di)，待凈化的(de)煙氣溫(wen)(wen)(wen)度(du)較(jiao)高，當壓(ya)(ya)縮空(kong)(kong)氣通過(guo)噴(pen)吹管噴(pen)入濾(lv)袋(dai)(dai)時，壓(ya)(ya)縮空(kong)(kong)氣突然釋放，袋(dai)(dai)口(kou)周圍溫(wen)(wen)(wen)度(du)急速下降(jiang)(jiang)，由(you)于溫(wen)(wen)(wen)度(du)的(de)差(cha)異和壓(ya)(ya)力(li)的(de)降(jiang)(jiang)低(di)，溫(wen)(wen)(wen)度(du)較(jiao)高的(de)濾(lv)袋(dai)(dai)口(kou)很(hen)容易形成結露(lu)(lu)現象；如果壓(ya)(ya)縮空(kong)(kong)氣質量較(jiao)差(cha)，含水(shui)含油，則結露(lu)(lu)更為嚴(yan)重。
用N2代替(ti)壓縮空氣(qi)，其優點是N2質量好，可(ke)減輕(qing)結露可(ke)能；同時，除塵(chen)布袋口(kou)導流管也有利于避免袋口(kou)結露。
5、煙氣進除塵器前(qian)的高(gao)溫(wen)措施
由于(yu)煙(yan)(yan)(yan)(yan)(yan)(yan)氣(qi)(qi)(qi)(qi)(qi)(qi)(qi)溫(wen)(wen)(wen)(wen)度(du)(du)高(gao)(gao)(gao)達約550℃，現(xian)在(zai)(zai)已(yi)有(you)的(de)普通袋式(shi)(shi)(shi)除(chu)(chu)(chu)塵(chen)器(qi)(qi)無(wu)法(fa)(fa)適應(ying)，故在(zai)(zai)煙(yan)(yan)(yan)(yan)(yan)(yan)氣(qi)(qi)(qi)(qi)(qi)(qi)(qi)進入袋式(shi)(shi)(shi)除(chu)(chu)(chu)塵(chen)器(qi)(qi)采取三項降(jiang)溫(wen)(wen)(wen)(wen)及(ji)(ji)預防措施(shi)。設置氣(qi)(qi)(qi)(qi)(qi)(qi)(qi)體(ti)(ti)冷(leng)(leng)(leng)(leng)(leng)(leng)卻(que)(que)(que)器(qi)(qi) 冷(leng)(leng)(leng)(leng)(leng)(leng)卻(que)(que)(que)高(gao)(gao)(gao)溫(wen)(wen)(wen)(wen)煙(yan)(yan)(yan)(yan)(yan)(yan)氣(qi)(qi)(qi)(qi)(qi)(qi)(qi)的(de)介質可以(yi)(yi)(yi)采用(yong)(yong)(yong)(yong)溫(wen)(wen)(wen)(wen)度(du)(du)低(di)(di)的(de)空(kong)氣(qi)(qi)(qi)(qi)(qi)(qi)(qi)或水(shui)(shui)，稱為(wei)風(feng)(feng)冷(leng)(leng)(leng)(leng)(leng)(leng)或水(shui)(shui)冷(leng)(leng)(leng)(leng)(leng)(leng)。不(bu)論風(feng)(feng)冷(leng)(leng)(leng)(leng)(leng)(leng)、水(shui)(shui)冷(leng)(leng)(leng)(leng)(leng)(leng)，可以(yi)(yi)(yi)是(shi)(shi)直接(jie)冷(leng)(leng)(leng)(leng)(leng)(leng)卻(que)(que)(que)，也可以(yi)(yi)(yi)是(shi)(shi)間接(jie)冷(leng)(leng)(leng)(leng)(leng)(leng)卻(que)(que)(que)，所以(yi)(yi)(yi)冷(leng)(leng)(leng)(leng)(leng)(leng)卻(que)(que)(que)方(fang)式(shi)(shi)(shi)用(yong)(yong)(yong)(yong)以(yi)(yi)(yi)下方(fang)法(fa)(fa)分類。裝(zhuang)設冷(leng)(leng)(leng)(leng)(leng)(leng)風(feng)(feng)閥 吸風(feng)(feng)冷(leng)(leng)(leng)(leng)(leng)(leng)卻(que)(que)(que)閥用(yong)(yong)(yong)(yong)在(zai)(zai)袋式(shi)(shi)(shi)除(chu)(chu)(chu)塵(chen)器(qi)(qi)以(yi)(yi)(yi)前主要是(shi)(shi)為(wei)了防止高(gao)(gao)(gao)煙(yan)(yan)(yan)(yan)(yan)(yan)氣(qi)(qi)(qi)(qi)(qi)(qi)(qi)超過允許溫(wen)(wen)(wen)(wen)度(du)(du)進入除(chu)(chu)(chu)塵(chen)器(qi)(qi)。它是(shi)(shi)一(yi)(yi)(yi)個有(you)調節功(gong)能的(de)蝶(die)閥，一(yi)(yi)(yi)端(duan)與高(gao)(gao)(gao)溫(wen)(wen)(wen)(wen)管道(dao)(dao)(dao)相接(jie)，另一(yi)(yi)(yi)端(duan)與大(da)氣(qi)(qi)(qi)(qi)(qi)(qi)(qi)相通。調節閥用(yong)(yong)(yong)(yong)溫(wen)(wen)(wen)(wen)度(du)(du)信號自(zi)動操(cao)作，控制吸入煙(yan)(yan)(yan)(yan)(yan)(yan)道(dao)(dao)(dao)系(xi)統(tong)的(de)空(kong)氣(qi)(qi)(qi)(qi)(qi)(qi)(qi)量，使(shi)煙(yan)(yan)(yan)(yan)(yan)(yan)氣(qi)(qi)(qi)(qi)(qi)(qi)(qi)溫(wen)(wen)(wen)(wen)度(du)(du)降(jiang)低(di)(di)，并調節在(zai)(zai)一(yi)(yi)(yi)定值范(fan) 圍(wei)內。吸風(feng)(feng)支(zhi)管與煙(yan)(yan)(yan)(yan)(yan)(yan)道(dao)(dao)(dao)相交處的(de)負壓(ya)應(ying)不(bu)小于(yu)50～100Pa，吸入的(de)空(kong)氣(qi)(qi)(qi)(qi)(qi)(qi)(qi)應(ying)與煙(yan)(yan)(yan)(yan)(yan)(yan)氣(qi)(qi)(qi)(qi)(qi)(qi)(qi)有(you)良好(hao)的(de)混(hun)(hun)合，然后(hou)進入袋式(shi)(shi)(shi)除(chu)(chu)(chu)塵(chen)器(qi)(qi)。這(zhe)種(zhong)(zhong)方(fang)法(fa)(fa)適用(yong)(yong)(yong)(yong)于(yu)煙(yan)(yan)(yan)(yan)(yan)(yan)氣(qi)(qi)(qi)(qi)(qi)(qi)(qi)溫(wen)(wen)(wen)(wen)度(du)(du)不(bu)太高(gao)(gao)(gao)的(de)系(xi)統(tong)。由于(yu)該方(fang)法(fa)(fa)溫(wen)(wen)(wen)(wen)度(du)(du)控制簡單(dan)，在(zai)(zai)用(yong)(yong)(yong)(yong)冷(leng)(leng)(leng)(leng)(leng)(leng)卻(que)(que)(que)器(qi)(qi)將高(gao)(gao)(gao)溫(wen)(wen)(wen)(wen)煙(yan)(yan)(yan)(yan)(yan)(yan)氣(qi)(qi)(qi)(qi)(qi)(qi)(qi)溫(wen)(wen)(wen)(wen)度(du)(du)大(da)幅度(du)(du)降(jiang)低(di)(di)后(hou)，再(zai)用(yong)(yong)(yong)(yong)這(zhe)種(zhong)(zhong)方(fang)法(fa)(fa)將溫(wen)(wen)(wen)(wen)度(du)(du)波動控制在(zai)(zai)較(jiao)低(di)(di)范(fan)圍(wei)，如土20℃內。噴霧直接(jie)冷(leng)(leng)(leng)(leng)(leng)(leng)卻(que)(que)(que)，往高(gao)(gao)(gao)溫(wen)(wen)(wen)(wen)煙(yan)(yan)(yan)(yan)(yan)(yan)氣(qi)(qi)(qi)(qi)(qi)(qi)(qi)中(zhong)直接(jie)噴水(shui)(shui)，用(yong)(yong)(yong)(yong)水(shui)(shui)霧的(de)蒸發吸熱(re)，使(shi)煙(yan)(yan)(yan)(yan)(yan)(yan)氣(qi)(qi)(qi)(qi)(qi)(qi)(qi)冷(leng)(leng)(leng)(leng)(leng)(leng)卻(que)(que)(que)。間接(jie)水(shui)(shui)冷(leng)(leng)(leng)(leng)(leng)(leng)，用(yong)(yong)(yong)(yong)水(shui)(shui)冷(leng)(leng)(leng)(leng)(leng)(leng)卻(que)(que)(que)在(zai)(zai)管內流(liu)(liu)動的(de)煙(yan)(yan)(yan)(yan)(yan)(yan)氣(qi)(qi)(qi)(qi)(qi)(qi)(qi)，可以(yi)(yi)(yi)用(yong)(yong)(yong)(yong)水(shui)(shui)冷(leng)(leng)(leng)(leng)(leng)(leng)夾(jia)套或冷(leng)(leng)(leng)(leng)(leng)(leng)卻(que)(que)(que)器(qi)(qi)等(deng)形(xing)成(cheng)(cheng)。間接(jie)冷(leng)(leng)(leng)(leng)(leng)(leng)風(feng)(feng)，用(yong)(yong)(yong)(yong)空(kong)氣(qi)(qi)(qi)(qi)(qi)(qi)(qi)冷(leng)(leng)(leng)(leng)(leng)(leng)卻(que)(que)(que)在(zai)(zai)管內流(liu)(liu)動的(de)高(gao)(gao)(gao)溫(wen)(wen)(wen)(wen)煙(yan)(yan)(yan)(yan)(yan)(yan)氣(qi)(qi)(qi)(qi)(qi)(qi)(qi)。吸風(feng)(feng)直接(jie)冷(leng)(leng)(leng)(leng)(leng)(leng)卻(que)(que)(que)，將常溫(wen)(wen)(wen)(wen)的(de)空(kong)氣(qi)(qi)(qi)(qi)(qi)(qi)(qi)直接(jie)混(hun)(hun)人高(gao)(gao)(gao)煙(yan)(yan)(yan)(yan)(yan)(yan)煙(yan)(yan)(yan)(yan)(yan)(yan)氣(qi)(qi)(qi)(qi)(qi)(qi)(qi)中(zhong)(摻冷(leng)(leng)(leng)(leng)(leng)(leng)方(fang)法(fa)(fa))。用(yong)(yong)(yong)(yong)自(zi)然對流(liu)(liu)空(kong)氣(qi)(qi)(qi)(qi)(qi)(qi)(qi)冷(leng)(leng)(leng)(leng)(leng)(leng)卻(que)(que)(que)的(de)風(feng)(feng)冷(leng)(leng)(leng)(leng)(leng)(leng)稱為(wei)自(zi)然風(feng)(feng)冷(leng)(leng)(leng)(leng)(leng)(leng)，用(yong)(yong)(yong)(yong)風(feng)(feng)機強迫(po)對流(liu)(liu)空(kong)氣(qi)(qi)(qi)(qi)(qi)(qi)(qi)冷(leng)(leng)(leng)(leng)(leng)(leng)卻(que)(que)(que)稱為(wei)機械風(feng)(feng)冷(leng)(leng)(leng)(leng)(leng)(leng)。各(ge)種(zhong)(zhong)冷(leng)(leng)(leng)(leng)(leng)(leng)卻(que)(que)(que)方(fang)法(fa)(fa)都(dou)適用(yong)(yong)(yong)(yong)于(yu)一(yi)(yi)(yi)定范(fan)圍(wei)，其特點、適用(yong)(yong)(yong)(yong)溫(wen)(wen)(wen)(wen)度(du)(du)和用(yong)(yong)(yong)(yong)途各(ge)不(bu)相同(tong)。混(hun)(hun)入低(di)(di)溫(wen)(wen)(wen)(wen)煙(yan)(yan)(yan)(yan)(yan)(yan)氣(qi)(qi)(qi)(qi)(qi)(qi)(qi) 在(zai)(zai)同(tong)一(yi)(yi)(yi)個除(chu)(chu)(chu)塵(chen)系(xi)統(tong)如果(guo)是(shi)(shi)不(bu)同(tong)溫(wen)(wen)(wen)(wen)度(du)(du)的(de)氣(qi)(qi)(qi)(qi)(qi)(qi)(qi)體(ti)(ti)，應(ying)首先把這(zhe)部(bu)(bu)(bu)分低(di)(di)溫(wen)(wen)(wen)(wen)氣(qi)(qi)(qi)(qi)(qi)(qi)(qi)體(ti)(ti)混(hun)(hun)合高(gao)(gao)(gao)溫(wen)(wen)(wen)(wen)氣(qi)(qi)(qi)(qi)(qi)(qi)(qi)體(ti)(ti)。結構(gou)措施(shi) 為(wei)防止高(gao)(gao)(gao)溫(wen)(wen)(wen)(wen)煙(yan)(yan)(yan)(yan)(yan)(yan)氣(qi)(qi)(qi)(qi)(qi)(qi)(qi)冷(leng)(leng)(leng)(leng)(leng)(leng)卻(que)(que)(que)后(hou)結露，在(zai)(zai)袋式(shi)(shi)(shi)除(chu)(chu)(chu)塵(chen)器(qi)(qi)內部(bu)(bu)(bu)結構(gou)沒計首先應(ying)盡量減少(shao)氣(qi)(qi)(qi)(qi)(qi)(qi)(qi)體(ti)(ti)停滯的(de)區(qu)域(yu)。除(chu)(chu)(chu)塵(chen)器(qi)(qi)根據布置含(han)塵(chen)空(kong)氣(qi)(qi)(qi)(qi)(qi)(qi)(qi)從箱體(ti)(ti)下部(bu)(bu)(bu)進人，而出(chu)口設置在(zai)(zai)箱體(ti)(ti)的(de)上部(bu)(bu)(bu)，與入口同(tong)側。此(ci)時，濾袋下部(bu)(bu)(bu)區(qu)域(yu)以(yi)(yi)(yi)及(ji)(ji)與出(chu)口相對的(de)部(bu)(bu)(bu)位，氣(qi)(qi)(qi)(qi)(qi)(qi)(qi)流(liu)(liu)會滯流(liu)(liu)，由于(yu)箱體(ti)(ti)壁面散熱(re)冷(leng)(leng)(leng)(leng)(leng)(leng)卻(que)(que)(que)，就(jiu)容易結露。為(wei)減少(shao)壁面散熱(re)，設計成(cheng)(cheng)在(zai)(zai)箱體(ti)(ti)內側面裝(zhuang)加強筋結構(gou)的(de)特殊形(xing)式(shi)(shi)(shi)。箱體(ti)(ti)上用(yong)(yong)(yong)(yong)的(de)環保型無(wu)石棉襯(chen)墊(dian)和密封材(cai)料(liao)，應(ying)選(xuan)擇能承受耐設定溫(wen)(wen)(wen)(wen)度(du)(du)的(de)材(cai)料(liao)。
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