除(chu)塵骨架的工作機理及因素
除塵器骨架的工作機理是含(han)塵(chen)(chen)(chen)煙氣通(tong)過過濾(lv)(lv)材(cai)料(liao)(liao),塵(chen)(chen)(chen)粒被(bei)過濾(lv)(lv)下(xia)來(lai),過濾(lv)(lv)材(cai)料(liao)(liao)捕(bu)集粗粒粉塵(chen)(chen)(chen)主要(yao)(yao)靠慣性碰撞作用(yong)(yong)(yong),捕(bu)集細(xi)粒粉塵(chen)(chen)(chen)主要(yao)(yao)靠擴散和(he)篩分作用(yong)(yong)(yong)。濾(lv)(lv)料(liao)(liao)的粉塵(chen)(chen)(chen)層也有 的過濾(lv)(lv)作用(yong)(yong)(yong)。除(chu)塵(chen)(chen)(chen)器(qi)骨(gu)架(jia)除(chu)塵(chen)(chen)(chen)效果的優(you)劣與多(duo)種因(yin)素有關(guan),但主要(yao)(yao)取決(jue)于濾(lv)(lv)料(liao)(liao)。布(bu)袋除(chu)塵(chen)(chen)(chen)器(qi)的濾(lv)(lv)料(liao)(liao)就是合成纖維、 纖維或玻(bo)(bo)璃纖維織成的布(bu)或氈。根(gen)據(ju)(ju)需要(yao)(yao)再把(ba)布(bu)或氈縫成圓筒(tong)或扁平形濾(lv)(lv)袋。根(gen)據(ju)(ju)煙氣性質,選(xuan)擇(ze)出適(shi)合于應用(yong)(yong)(yong)條件的濾(lv)(lv)料(liao)(liao)。通(tong)常,在(zai)煙氣溫(wen)度低于120℃,要(yao)(yao)求濾(lv)(lv)料(liao)(liao)具有耐酸性和(he)的情況下(xia),常選(xuan)用(yong)(yong)(yong)滌綸絨布(bu)和(he)滌綸針刺氈;在(zai)處(chu)理高溫(wen)煙氣(<250℃)時,主要(yao)(yao)選(xuan)用(yong)(yong)(yong)石墨化玻(bo)(bo)璃絲布(bu);在(zai)某(mou)些情況下(xia),選(xuan)用(yong)(yong)(yong)炭素纖維濾(lv)(lv)料(liao)(liao)等。
除塵(chen)骨架運行中控制煙氣(qi)通過濾料的(de)速(su)度(du)(稱為(wei)過濾速(su)度(du))頗為(wei)重要。一般取過濾速(su)度(du)為(wei)0.5—2m/min,對于大于0.1的(de)微粒效(xiao)率可達99%以(yi)上(shang),設備阻力損失約(yue)為(wei)980—I470Pa 。