煤粉(fen)灰烘干機是煤粉(fen)經高溫燃(ran)燒(shao)后形成的(de)一(yi)種似火山灰質混合材(cai)料(liao)。
它是燃(ran)燒(shao)煤(mei)(mei)的(de)發電廠將(jiang)煤(mei)(mei)磨成(cheng)(cheng)100微米以下的(de)煤(mei)(mei)粉,用預熱空氣噴(pen)入爐膛經燃(ran)燒(shao)形成(cheng)(cheng)懸浮狀態,產生混雜有大(da)量不燃(ran)物的(de)高溫煙(yan)氣,經集塵裝置捕集就得到了粉煤(mei)(mei)灰。粉煤(mei)(mei)灰的(de)化學組成(cheng)(cheng)與(yu)粘土(tu)質相似,主要成(cheng)(cheng)分為二氧(yang)化硅、三氧(yang)化二鋁、三氧(yang)化二鐵(tie)、氧(yang)化鈣(gai)和未燃(ran)盡碳。
工作原理
濕粉煤灰由供料裝置進(jin)(jin)(jin)入三層(ceng)(ceng)滾(gun)筒的(de)(de)內(nei)(nei)層(ceng)(ceng),實現(xian)順流(liu)(liu)烘干(gan), 粉煤灰在內(nei)(nei)層(ceng)(ceng)的(de)(de)抄板(ban)下(xia)不(bu)斷抄起、散(san)落呈(cheng)螺旋行(xing)(xing)(xing)(xing)進(jin)(jin)(jin)式(shi)實現(xian)熱(re)交換(huan),物(wu)(wu)料移動至內(nei)(nei)層(ceng)(ceng)的(de)(de)另一(yi)端進(jin)(jin)(jin)入中(zhong)層(ceng)(ceng),進(jin)(jin)(jin)行(xing)(xing)(xing)(xing)逆流(liu)(liu)烘干(gan),物(wu)(wu)料在中(zhong)層(ceng)(ceng)不(bu)斷地(di)被反復(fu)揚(yang)進(jin)(jin)(jin),呈(cheng)進(jin)(jin)(jin)兩步退一(yi)步的(de)(de)行(xing)(xing)(xing)(xing)進(jin)(jin)(jin)方(fang)式(shi),物(wu)(wu)料在中(zhong)層(ceng)(ceng)既充(chong)分吸收(shou)內(nei)(nei)層(ceng)(ceng)滾(gun)筒散(san)發的(de)(de)熱(re)量(liang),又(you)吸收(shou)中(zhong)層(ceng)(ceng)滾(gun)筒的(de)(de)熱(re)量(liang),同時(shi)又(you)延長了干(gan)燥(zao)時(shi)間,物(wu)(wu)料在此達到(dao)干(gan)燥(zao)狀態。物(wu)(wu)料行(xing)(xing)(xing)(xing)至中(zhong)層(ceng)(ceng)另一(yi)端而落入外(wai)層(ceng)(ceng),物(wu)(wu)料在外(wai)層(ceng)(ceng)滾(gun)筒內(nei)(nei)呈(cheng)矩形(xing)多回路(lu)方(fang)式(shi)行(xing)(xing)(xing)(xing)進(jin)(jin)(jin),達到(dao)干(gan)燥(zao)效(xiao)果的(de)(de)物(wu)(wu)料在熱(re)風作用下(xia)快(kuai)速行(xing)(xing)(xing)(xing)進(jin)(jin)(jin)排(pai)出(chu)滾(gun)筒,沒有(you)達到(dao)干(gan)燥(zao)效(xiao)果的(de)(de)濕物(wu)(wu)料因自重而不(bu)能(neng)快(kuai)速行(xing)(xing)(xing)(xing)進(jin)(jin)(jin),物(wu)(wu)料在此矩形(xing)抄板(ban)內(nei)(nei)進(jin)(jin)(jin)行(xing)(xing)(xing)(xing)充(chong)分干(gan)燥(zao),由此達到(dao)干(gan)燥(zao)效(xiao)果,完(wan)成(cheng)干(gan)燥(zao)過程。
設備特點
該設備與其他干燥(zao)設備相比(bi),生(sheng)產(chan)能力大(da)(da),可(ke)連續操(cao)作; 結構簡單,操(cao)作方(fang)便;故障(zhang)少(shao),維修費用(yong)低;適用(yong)范圍(wei)(wei)廣,流體阻(zu)力小,可(ke)以用(yong)它(ta)干燥(zao)顆料狀物(wu)料,對于(yu)那些附著性(xing)大(da)(da)的物(wu)料也很(hen)有利;操(cao)作彈性(xing)大(da)(da),生(sheng)產(chan)上允許產(chan)品的流量(liang)有較大(da)(da)波(bo)動范圍(wei)(wei),不會影(ying)響產(chan)品的質(zhi)量(liang);清掃(sao)容易。