粉煤灰烘干機是煤粉經高溫燃燒后形成的一種似火山灰質混合材料。
它是燃(ran)燒煤(mei)的(de)發(fa)電(dian)廠(chang)將煤(mei)磨成(cheng)100微米(mi)以下的(de)煤(mei)粉(fen),用預熱空氣(qi)噴入爐膛經(jing)燃(ran)燒形(xing)成(cheng)懸浮狀態,產生混雜有(you)大(da)量不(bu)燃(ran)物(wu)的(de)高溫煙氣(qi),經(jing)集塵裝置捕(bu)集就得到了(le)粉(fen)煤(mei)灰(hui)。粉(fen)煤(mei)灰(hui)的(de)化學組成(cheng)與粘土質相似(si),主要成(cheng)分為二(er)(er)氧化硅、三(san)氧化二(er)(er)鋁、三(san)氧化二(er)(er)鐵、氧化鈣和(he)未燃(ran)盡碳。
工作原理
濕粉煤(mei)灰由供料(liao)(liao)(liao)裝置進(jin)入(ru)三層(ceng)(ceng)(ceng)(ceng)滾(gun)筒的內層(ceng)(ceng)(ceng)(ceng),實(shi)現(xian)順(shun)流(liu)烘干, 粉煤(mei)灰在(zai)(zai)內層(ceng)(ceng)(ceng)(ceng)的抄板下(xia)(xia)不斷(duan)抄起(qi)、散(san)落呈(cheng)螺旋(xuan)行進(jin)式(shi)實(shi)現(xian)熱(re)(re)交(jiao)換,物(wu)(wu)料(liao)(liao)(liao)移動至(zhi)內層(ceng)(ceng)(ceng)(ceng)的另(ling)一端(duan)(duan)進(jin)入(ru)中(zhong)(zhong)層(ceng)(ceng)(ceng)(ceng),進(jin)行逆流(liu)烘干,物(wu)(wu)料(liao)(liao)(liao)在(zai)(zai)中(zhong)(zhong)層(ceng)(ceng)(ceng)(ceng)不斷(duan)地被反復揚進(jin),呈(cheng)進(jin)兩步退一步的行進(jin)方式(shi),物(wu)(wu)料(liao)(liao)(liao)在(zai)(zai)中(zhong)(zhong)層(ceng)(ceng)(ceng)(ceng)既充分吸(xi)(xi)收內層(ceng)(ceng)(ceng)(ceng)滾(gun)筒散(san)發的熱(re)(re)量,又吸(xi)(xi)收中(zhong)(zhong)層(ceng)(ceng)(ceng)(ceng)滾(gun)筒的熱(re)(re)量,同時又延長了干燥(zao)(zao)時間,物(wu)(wu)料(liao)(liao)(liao)在(zai)(zai)此(ci)達到干燥(zao)(zao)狀態(tai)。物(wu)(wu)料(liao)(liao)(liao)行至(zhi)中(zhong)(zhong)層(ceng)(ceng)(ceng)(ceng)另(ling)一端(duan)(duan)而(er)落入(ru)外(wai)層(ceng)(ceng)(ceng)(ceng),物(wu)(wu)料(liao)(liao)(liao)在(zai)(zai)外(wai)層(ceng)(ceng)(ceng)(ceng)滾(gun)筒內呈(cheng)矩(ju)形多回(hui)路方式(shi)行進(jin),達到干燥(zao)(zao)效(xiao)果的物(wu)(wu)料(liao)(liao)(liao)在(zai)(zai)熱(re)(re)風作用下(xia)(xia)快速(su)行進(jin)排(pai)出滾(gun)筒,沒(mei)有達到干燥(zao)(zao)效(xiao)果的濕物(wu)(wu)料(liao)(liao)(liao)因自重(zhong)而(er)不能快速(su)行進(jin),物(wu)(wu)料(liao)(liao)(liao)在(zai)(zai)此(ci)矩(ju)形抄板內進(jin)行充分干燥(zao)(zao),由此(ci)達到干燥(zao)(zao)效(xiao)果,完成干燥(zao)(zao)過程。
設(she)備特(te)點
該(gai)設備與其他干燥設備相比,生(sheng)(sheng)產(chan)能力(li)大(da)(da),可(ke)連續操(cao)作(zuo); 結構簡單,操(cao)作(zuo)方便;故障少,維修費用低(di);適用范(fan)圍廣,流(liu)體(ti)阻力(li)小,可(ke)以用它(ta)干燥顆料狀物(wu)料,對于那些(xie)附著性(xing)大(da)(da)的(de)物(wu)料也(ye)很有利;操(cao)作(zuo)彈性(xing)大(da)(da),生(sheng)(sheng)產(chan)上允許產(chan)品(pin)的(de)流(liu)量有較(jiao)大(da)(da)波動范(fan)圍,不(bu)會影響產(chan)品(pin)的(de)質量;清掃容易。