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(ta)是燃(ran)燒煤的(de)發電廠將煤磨成(cheng)100微米以下的(de)煤粉,用預(yu)熱空(kong)氣噴入爐膛經(jing)燃(ran)燒形成(cheng)懸浮狀(zhuang)態,產生混雜有大量不燃(ran)物的(de)高溫(wen)煙氣,經(jing)集(ji)塵(chen)裝置(zhi)捕集(ji)就得到了粉煤灰(hui)(hui)。粉煤灰(hui)(hui)的(de)化(hua)學組(zu)成(cheng)與粘(zhan)土質(zhi)相似,主要成(cheng)分為二氧(yang)化(hua)硅、三氧(yang)化(hua)二鋁、三氧(yang)化(hua)二鐵、氧(yang)化(hua)鈣和未燃(ran)盡碳。
工作原理
濕(shi)粉煤(mei)灰由(you)供料(liao)裝置進(jin)(jin)(jin)入三層(ceng)(ceng)滾筒的(de)內(nei)(nei)層(ceng)(ceng),實現(xian)順(shun)流(liu)烘(hong)干(gan), 粉煤(mei)灰在(zai)(zai)(zai)(zai)內(nei)(nei)層(ceng)(ceng)的(de)抄板下不斷抄起(qi)、散落(luo)呈(cheng)螺旋行(xing)(xing)進(jin)(jin)(jin)式(shi)實現(xian)熱交換,物(wu)(wu)(wu)料(liao)移(yi)動至內(nei)(nei)層(ceng)(ceng)的(de)另(ling)一(yi)端進(jin)(jin)(jin)入中(zhong)層(ceng)(ceng),進(jin)(jin)(jin)行(xing)(xing)逆流(liu)烘(hong)干(gan),物(wu)(wu)(wu)料(liao)在(zai)(zai)(zai)(zai)中(zhong)層(ceng)(ceng)不斷地被反復揚(yang)進(jin)(jin)(jin),呈(cheng)進(jin)(jin)(jin)兩步退一(yi)步的(de)行(xing)(xing)進(jin)(jin)(jin)方(fang)式(shi),物(wu)(wu)(wu)料(liao)在(zai)(zai)(zai)(zai)中(zhong)層(ceng)(ceng)既(ji)充(chong)分(fen)吸(xi)(xi)收內(nei)(nei)層(ceng)(ceng)滾筒散發的(de)熱量,又吸(xi)(xi)收中(zhong)層(ceng)(ceng)滾筒的(de)熱量,同(tong)時(shi)又延長了干(gan)燥時(shi)間(jian),物(wu)(wu)(wu)料(liao)在(zai)(zai)(zai)(zai)此(ci)(ci)達到干(gan)燥狀態。物(wu)(wu)(wu)料(liao)行(xing)(xing)至中(zhong)層(ceng)(ceng)另(ling)一(yi)端而(er)落(luo)入外層(ceng)(ceng),物(wu)(wu)(wu)料(liao)在(zai)(zai)(zai)(zai)外層(ceng)(ceng)滾筒內(nei)(nei)呈(cheng)矩(ju)形(xing)多回路(lu)方(fang)式(shi)行(xing)(xing)進(jin)(jin)(jin),達到干(gan)燥效(xiao)(xiao)果(guo)的(de)物(wu)(wu)(wu)料(liao)在(zai)(zai)(zai)(zai)熱風(feng)作用下快速(su)行(xing)(xing)進(jin)(jin)(jin)排(pai)出滾筒,沒有達到干(gan)燥效(xiao)(xiao)果(guo)的(de)濕(shi)物(wu)(wu)(wu)料(liao)因自(zi)重而(er)不能快速(su)行(xing)(xing)進(jin)(jin)(jin),物(wu)(wu)(wu)料(liao)在(zai)(zai)(zai)(zai)此(ci)(ci)矩(ju)形(xing)抄板內(nei)(nei)進(jin)(jin)(jin)行(xing)(xing)充(chong)分(fen)干(gan)燥,由(you)此(ci)(ci)達到干(gan)燥效(xiao)(xiao)果(guo),完成干(gan)燥過程。
設備特(te)點(dian)
該(gai)設(she)備與其(qi)他干燥設(she)備相比(bi),生產能力(li)大,可(ke)連續操作(zuo); 結構(gou)簡(jian)單(dan),操作(zuo)方便;故(gu)障(zhang)少,維修費(fei)用(yong)低;適用(yong)范圍廣(guang),流(liu)體阻力(li)小,可(ke)以用(yong)它干燥顆料(liao)狀物(wu)料(liao),對于那些附著性(xing)大的物(wu)料(liao)也很有利;操作(zuo)彈性(xing)大,生產上允許產品的流(liu)量有較(jiao)大波動范圍,不會影響產品的質(zhi)量;清掃容易。