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)燒煤的發電廠將(jiang)煤磨成(cheng)(cheng)100微米以下的煤粉,用預熱空(kong)氣(qi)噴入爐(lu)膛經(jing)燃(ran)燒形(xing)成(cheng)(cheng)懸浮狀態,產生混(hun)雜(za)有大(da)量不燃(ran)物的高溫煙氣(qi),經(jing)集塵(chen)裝(zhuang)置(zhi)捕集就得到了粉煤灰。粉煤灰的化(hua)學(xue)組成(cheng)(cheng)與粘(zhan)土質相似,主要成(cheng)(cheng)分為(wei)二(er)氧化(hua)硅、三(san)氧化(hua)二(er)鋁(lv)、三(san)氧化(hua)二(er)鐵、氧化(hua)鈣和未(wei)燃(ran)盡碳。
工作原理
濕粉煤灰(hui)(hui)由供(gong)料(liao)裝置進(jin)(jin)(jin)(jin)入(ru)三層(ceng)(ceng)滾筒(tong)的(de)(de)內(nei)層(ceng)(ceng),實現順流烘(hong)干, 粉煤灰(hui)(hui)在(zai)(zai)(zai)內(nei)層(ceng)(ceng)的(de)(de)抄(chao)(chao)(chao)板下不(bu)斷(duan)抄(chao)(chao)(chao)起、散落呈螺(luo)旋行(xing)(xing)進(jin)(jin)(jin)(jin)式實現熱(re)(re)交換,物料(liao)移動至內(nei)層(ceng)(ceng)的(de)(de)另一端進(jin)(jin)(jin)(jin)入(ru)中(zhong)層(ceng)(ceng),進(jin)(jin)(jin)(jin)行(xing)(xing)逆流烘(hong)干,物料(liao)在(zai)(zai)(zai)中(zhong)層(ceng)(ceng)不(bu)斷(duan)地被反復揚進(jin)(jin)(jin)(jin),呈進(jin)(jin)(jin)(jin)兩步(bu)退(tui)一步(bu)的(de)(de)行(xing)(xing)進(jin)(jin)(jin)(jin)方式,物料(liao)在(zai)(zai)(zai)中(zhong)層(ceng)(ceng)既充分(fen)吸(xi)(xi)收(shou)內(nei)層(ceng)(ceng)滾筒(tong)散發的(de)(de)熱(re)(re)量,又吸(xi)(xi)收(shou)中(zhong)層(ceng)(ceng)滾筒(tong)的(de)(de)熱(re)(re)量,同(tong)時又延長了干燥(zao)時間,物料(liao)在(zai)(zai)(zai)此達到干燥(zao)狀態。物料(liao)行(xing)(xing)至中(zhong)層(ceng)(ceng)另一端而(er)落入(ru)外(wai)層(ceng)(ceng),物料(liao)在(zai)(zai)(zai)外(wai)層(ceng)(ceng)滾筒(tong)內(nei)呈矩形(xing)(xing)多(duo)回路方式行(xing)(xing)進(jin)(jin)(jin)(jin),達到干燥(zao)效果(guo)的(de)(de)物料(liao)在(zai)(zai)(zai)熱(re)(re)風作(zuo)用下快速(su)行(xing)(xing)進(jin)(jin)(jin)(jin)排出滾筒(tong),沒有達到干燥(zao)效果(guo)的(de)(de)濕物料(liao)因自(zi)重而(er)不(bu)能(neng)快速(su)行(xing)(xing)進(jin)(jin)(jin)(jin),物料(liao)在(zai)(zai)(zai)此矩形(xing)(xing)抄(chao)(chao)(chao)板內(nei)進(jin)(jin)(jin)(jin)行(xing)(xing)充分(fen)干燥(zao),由此達到干燥(zao)效果(guo),完(wan)成干燥(zao)過程。
設備特點
該(gai)設(she)備與(yu)其他干燥(zao)設(she)備相比,生產能力大,可連續操(cao)作; 結(jie)構簡單(dan),操(cao)作方(fang)便;故障少,維修費用低;適用范圍(wei)廣,流(liu)體阻力小,可以用它干燥(zao)顆料(liao)狀物料(liao),對于那些(xie)附著(zhu)性大的物料(liao)也很(hen)有利;操(cao)作彈性大,生產上允許(xu)產品(pin)(pin)的流(liu)量有較大波動(dong)范圍(wei),不會影響產品(pin)(pin)的質(zhi)量;清掃容易。