許多人會有疑惑，為什(shen)么(me)(me)脫(tuo)硫脫(tuo)硝煙(yan)(yan)囪為什(shen)么(me)(me)會冒(mao)白煙(yan)(yan)呢？下面小(xiao)編和(he)大家(jia)一起學習。

      現有混凝(ning)土(tu)煙(yan)(yan)(yan)(yan)囪120米高，鍋爐采(cai)(cai)用(yong)干法脫(tuo)硫，排煙(yan)(yan)(yan)(yan)溫(wen)(wen)度(du)110oC，煙(yan)(yan)(yan)(yan)氣(qi)(qi)濕(shi)(shi)度(du)3%。由于(yu)煙(yan)(yan)(yan)(yan)溫(wen)(wen)高、含濕(shi)(shi)量(liang)(liang)低(di)，從外觀(guan)上不產(chan)生白煙(yan)(yan)(yan)(yan)。新建煙(yan)(yan)(yan)(yan)囪90米，采(cai)(cai)用(yong)濕(shi)(shi)法脫(tuo)硫脫(tuo)硝處理煙(yan)(yan)(yan)(yan)氣(qi)(qi)，排煙(yan)(yan)(yan)(yan)溫(wen)(wen)度(du)會降(jiang)至(zhi)60 oC，煙(yan)(yan)(yan)(yan)氣(qi)(qi)濕(shi)(shi)度(du)會增(zeng)加(jia)。預計會產(chan)生冒白煙(yan)(yan)(yan)(yan)現象。高溫(wen)(wen)煙(yan)(yan)(yan)(yan)氣(qi)(qi)在接觸液體時(shi)被增(zeng)濕(shi)(shi)冷卻，液體中(zhong)的(de)水(shui)(shui)分被吸收(shou)氣(qi)(qi)化，導(dao)致(zhi)煙(yan)(yan)(yan)(yan)氣(qi)(qi)中(zhong)的(de)水(shui)(shui)蒸汽(qi)總量(liang)(liang)增(zeng)加(jia)，隨著脫(tuo)硫過程的(de)進行(xing)，煙(yan)(yan)(yan)(yan)氣(qi)(qi)溫(wen)(wen)度(du)逐漸降(jiang)低(di)，煙(yan)(yan)(yan)(yan)氣(qi)(qi)溫(wen)(wen)度(du)降(jiang)低(di)使煙(yan)(yan)(yan)(yan)氣(qi)(qi)攜帶蒸 汽(qi)的(de)能(neng)力降(jiang)低(di)，煙(yan)(yan)(yan)(yan)氣(qi)(qi)達(da)到飽和時(shi)，水(shui)(shui)蒸汽(qi)重量(liang)(liang)超出(chu)了煙(yan)(yan)(yan)(yan)氣(qi)(qi)的(de)攜帶能(neng)力，就會有大量(liang)(liang)水(shui)(shui)蒸汽(qi)凝(ning)結為小(xiao)水(shui)(shui)滴，形成(cheng)(cheng)濕(shi)(shi)煙(yan)(yan)(yan)(yan)氣(qi)(qi)，濕(shi)(shi)煙(yan)(yan)(yan)(yan)氣(qi)(qi)排放形成(cheng)(cheng)白煙(yan)(yan)(yan)(yan)。
       白煙主要成分是水蒸(zheng)汽，是經過(guo)脫(tuo)硫脫(tuo)硝處理后(hou)的干凈煙氣(qi)(qi)，排放(fang)濃(nong)度(du)達(da)到國家標(biao)準。同時(shi)，國內(nei)火電廠的濕法脫(tuo)硫脫(tuo)硝煙氣(qi)(qi)排放(fang)過(guo)程中也會(hui)產生白煙。

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