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(ran)燒煤的發電廠(chang)將煤磨成100微米以下(xia)的煤粉(fen),用預熱空氣噴入(ru)爐(lu)膛經燃(ran)燒形成懸浮狀態,產生混雜有大量(liang)不燃(ran)物(wu)的高溫煙氣,經集塵(chen)裝置(zhi)捕集就得到(dao)了粉(fen)煤灰。粉(fen)煤灰的化學組成與粘(zhan)土質相似,主要成分(fen)為(wei)二氧(yang)化硅、三(san)氧(yang)化二鋁、三(san)氧(yang)化二鐵、氧(yang)化鈣和未(wei)燃(ran)盡(jin)碳。
工(gong)作原(yuan)理
濕(shi)(shi)粉煤(mei)(mei)灰由(you)供(gong)料(liao)(liao)裝置進入三層(ceng)(ceng)(ceng)(ceng)(ceng)滾(gun)筒(tong)的(de)內(nei)(nei)(nei)層(ceng)(ceng)(ceng)(ceng)(ceng),實(shi)(shi)現(xian)順流烘干(gan)(gan), 粉煤(mei)(mei)灰在內(nei)(nei)(nei)層(ceng)(ceng)(ceng)(ceng)(ceng)的(de)抄(chao)板(ban)下不斷抄(chao)起、散(san)落呈(cheng)(cheng)螺旋行(xing)進式實(shi)(shi)現(xian)熱(re)交(jiao)換,物(wu)(wu)料(liao)(liao)移動至內(nei)(nei)(nei)層(ceng)(ceng)(ceng)(ceng)(ceng)的(de)另(ling)(ling)一(yi)端進入中(zhong)層(ceng)(ceng)(ceng)(ceng)(ceng),進行(xing)逆(ni)流烘干(gan)(gan),物(wu)(wu)料(liao)(liao)在中(zhong)層(ceng)(ceng)(ceng)(ceng)(ceng)不斷地被反復揚進,呈(cheng)(cheng)進兩步退一(yi)步的(de)行(xing)進方(fang)式,物(wu)(wu)料(liao)(liao)在中(zhong)層(ceng)(ceng)(ceng)(ceng)(ceng)既(ji)充分(fen)吸收內(nei)(nei)(nei)層(ceng)(ceng)(ceng)(ceng)(ceng)滾(gun)筒(tong)散(san)發的(de)熱(re)量,又吸收中(zhong)層(ceng)(ceng)(ceng)(ceng)(ceng)滾(gun)筒(tong)的(de)熱(re)量,同時(shi)又延長了(le)干(gan)(gan)燥(zao)時(shi)間,物(wu)(wu)料(liao)(liao)在此(ci)達(da)到(dao)干(gan)(gan)燥(zao)狀態。物(wu)(wu)料(liao)(liao)行(xing)至中(zhong)層(ceng)(ceng)(ceng)(ceng)(ceng)另(ling)(ling)一(yi)端而落入外層(ceng)(ceng)(ceng)(ceng)(ceng),物(wu)(wu)料(liao)(liao)在外層(ceng)(ceng)(ceng)(ceng)(ceng)滾(gun)筒(tong)內(nei)(nei)(nei)呈(cheng)(cheng)矩(ju)形多回路(lu)方(fang)式行(xing)進,達(da)到(dao)干(gan)(gan)燥(zao)效(xiao)果(guo)的(de)物(wu)(wu)料(liao)(liao)在熱(re)風(feng)作(zuo)用下快(kuai)速行(xing)進排出滾(gun)筒(tong),沒有達(da)到(dao)干(gan)(gan)燥(zao)效(xiao)果(guo)的(de)濕(shi)(shi)物(wu)(wu)料(liao)(liao)因自重(zhong)而不能快(kuai)速行(xing)進,物(wu)(wu)料(liao)(liao)在此(ci)矩(ju)形抄(chao)板(ban)內(nei)(nei)(nei)進行(xing)充分(fen)干(gan)(gan)燥(zao),由(you)此(ci)達(da)到(dao)干(gan)(gan)燥(zao)效(xiao)果(guo),完成干(gan)(gan)燥(zao)過程。
設備特點
該設備(bei)與其他干燥(zao)設備(bei)相比,生產能力(li)大,可連續操(cao)作(zuo); 結構簡單(dan),操(cao)作(zuo)方(fang)便(bian);故障少,維(wei)修費用(yong)低(di);適(shi)用(yong)范圍(wei)廣(guang),流(liu)體阻(zu)力(li)小,可以(yi)用(yong)它干燥(zao)顆料(liao)狀物料(liao),對于那些附(fu)著(zhu)性大的(de)(de)物料(liao)也很有利;操(cao)作(zuo)彈性大,生產上允許(xu)產品(pin)的(de)(de)流(liu)量有較大波動范圍(wei),不會影響產品(pin)的(de)(de)質量;清(qing)掃容(rong)易。