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(shi)燃燒煤(mei)的發電廠將(jiang)煤(mei)磨成(cheng)(cheng)100微(wei)米以下(xia)的煤(mei)粉(fen)(fen),用預熱(re)空氣(qi)噴入(ru)爐膛經燃燒形成(cheng)(cheng)懸浮狀態,產(chan)生混雜有(you)大(da)量(liang)不燃物的高溫煙氣(qi),經集塵裝(zhuang)置捕集就得到了粉(fen)(fen)煤(mei)灰(hui)。粉(fen)(fen)煤(mei)灰(hui)的化(hua)學組成(cheng)(cheng)與粘土質相似(si),主要成(cheng)(cheng)分(fen)為(wei)二氧化(hua)硅、三(san)氧化(hua)二鋁、三(san)氧化(hua)二鐵(tie)、氧化(hua)鈣和未燃盡碳。
工作原理
濕粉(fen)煤灰由供料(liao)(liao)(liao)裝置進(jin)入三層(ceng)(ceng)(ceng)(ceng)滾(gun)(gun)(gun)筒的(de)內層(ceng)(ceng)(ceng)(ceng),實現順流(liu)烘干, 粉(fen)煤灰在內層(ceng)(ceng)(ceng)(ceng)的(de)抄(chao)板下不(bu)斷抄(chao)起(qi)、散落呈(cheng)螺旋行(xing)進(jin)式(shi)實現熱(re)(re)(re)交換,物(wu)(wu)(wu)(wu)料(liao)(liao)(liao)移動至內層(ceng)(ceng)(ceng)(ceng)的(de)另(ling)一(yi)端進(jin)入中(zhong)(zhong)層(ceng)(ceng)(ceng)(ceng),進(jin)行(xing)逆流(liu)烘干,物(wu)(wu)(wu)(wu)料(liao)(liao)(liao)在中(zhong)(zhong)層(ceng)(ceng)(ceng)(ceng)不(bu)斷地被反復揚進(jin),呈(cheng)進(jin)兩步退一(yi)步的(de)行(xing)進(jin)方式(shi),物(wu)(wu)(wu)(wu)料(liao)(liao)(liao)在中(zhong)(zhong)層(ceng)(ceng)(ceng)(ceng)既充(chong)分吸(xi)收內層(ceng)(ceng)(ceng)(ceng)滾(gun)(gun)(gun)筒散發(fa)的(de)熱(re)(re)(re)量,又吸(xi)收中(zhong)(zhong)層(ceng)(ceng)(ceng)(ceng)滾(gun)(gun)(gun)筒的(de)熱(re)(re)(re)量,同時又延長了(le)干燥時間,物(wu)(wu)(wu)(wu)料(liao)(liao)(liao)在此(ci)達到干燥狀態。物(wu)(wu)(wu)(wu)料(liao)(liao)(liao)行(xing)至中(zhong)(zhong)層(ceng)(ceng)(ceng)(ceng)另(ling)一(yi)端而(er)落入外層(ceng)(ceng)(ceng)(ceng),物(wu)(wu)(wu)(wu)料(liao)(liao)(liao)在外層(ceng)(ceng)(ceng)(ceng)滾(gun)(gun)(gun)筒內呈(cheng)矩形多回路方式(shi)行(xing)進(jin),達到干燥效(xiao)(xiao)果的(de)物(wu)(wu)(wu)(wu)料(liao)(liao)(liao)在熱(re)(re)(re)風(feng)作(zuo)用(yong)下快(kuai)速(su)行(xing)進(jin)排出滾(gun)(gun)(gun)筒,沒有達到干燥效(xiao)(xiao)果的(de)濕物(wu)(wu)(wu)(wu)料(liao)(liao)(liao)因自重而(er)不(bu)能快(kuai)速(su)行(xing)進(jin),物(wu)(wu)(wu)(wu)料(liao)(liao)(liao)在此(ci)矩形抄(chao)板內進(jin)行(xing)充(chong)分干燥,由此(ci)達到干燥效(xiao)(xiao)果,完成干燥過程。
設備特點
該設備(bei)與其他(ta)干燥(zao)設備(bei)相比,生產(chan)(chan)能(neng)力(li)大(da),可(ke)連續操(cao)作(zuo); 結構簡單,操(cao)作(zuo)方(fang)便(bian);故障少,維修費用低;適用范圍(wei)廣,流(liu)體阻力(li)小,可(ke)以用它干燥(zao)顆料狀(zhuang)物料,對于那(nei)些附著性(xing)大(da)的(de)物料也很有利;操(cao)作(zuo)彈性(xing)大(da),生產(chan)(chan)上允許產(chan)(chan)品的(de)流(liu)量(liang)有較大(da)波動范圍(wei),不會影(ying)響產(chan)(chan)品的(de)質量(liang);清掃(sao)容(rong)易。