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(shao)煤(mei)的發電廠將煤(mei)磨成100微米以下的煤(mei)粉,用預熱空氣噴入(ru)爐(lu)膛(tang)經燃(ran)燒(shao)形成懸浮(fu)狀態(tai),產生混雜有大量不燃(ran)物的高(gao)溫煙氣,經集塵(chen)裝置(zhi)捕集就(jiu)得到了粉煤(mei)灰(hui)。粉煤(mei)灰(hui)的化學組成與(yu)粘土(tu)質(zhi)相似,主要成分為二(er)(er)(er)氧(yang)化硅、三(san)氧(yang)化二(er)(er)(er)鋁、三(san)氧(yang)化二(er)(er)(er)鐵(tie)、氧(yang)化鈣和未燃(ran)盡碳。
工作(zuo)原(yuan)理(li)
濕(shi)粉煤灰由供料裝置進入三層(ceng)(ceng)(ceng)滾(gun)(gun)(gun)筒的(de)(de)內層(ceng)(ceng)(ceng),實(shi)現(xian)順流烘(hong)干(gan)(gan), 粉煤灰在(zai)內層(ceng)(ceng)(ceng)的(de)(de)抄板(ban)下(xia)不(bu)斷(duan)抄起、散落(luo)呈螺旋行(xing)(xing)(xing)(xing)(xing)(xing)進式(shi)(shi)實(shi)現(xian)熱交換,物(wu)料移動至(zhi)內層(ceng)(ceng)(ceng)的(de)(de)另(ling)一端(duan)進入中層(ceng)(ceng)(ceng),進行(xing)(xing)(xing)(xing)(xing)(xing)逆流烘(hong)干(gan)(gan),物(wu)料在(zai)中層(ceng)(ceng)(ceng)不(bu)斷(duan)地被反復揚進,呈進兩(liang)步(bu)退一步(bu)的(de)(de)行(xing)(xing)(xing)(xing)(xing)(xing)進方式(shi)(shi),物(wu)料在(zai)中層(ceng)(ceng)(ceng)既(ji)充分吸(xi)(xi)收內層(ceng)(ceng)(ceng)滾(gun)(gun)(gun)筒散發(fa)的(de)(de)熱量,又吸(xi)(xi)收中層(ceng)(ceng)(ceng)滾(gun)(gun)(gun)筒的(de)(de)熱量,同(tong)時又延(yan)長了干(gan)(gan)燥(zao)(zao)(zao)時間,物(wu)料在(zai)此達到干(gan)(gan)燥(zao)(zao)(zao)狀態。物(wu)料行(xing)(xing)(xing)(xing)(xing)(xing)至(zhi)中層(ceng)(ceng)(ceng)另(ling)一端(duan)而落(luo)入外層(ceng)(ceng)(ceng),物(wu)料在(zai)外層(ceng)(ceng)(ceng)滾(gun)(gun)(gun)筒內呈矩形多回路方式(shi)(shi)行(xing)(xing)(xing)(xing)(xing)(xing)進,達到干(gan)(gan)燥(zao)(zao)(zao)效(xiao)果的(de)(de)物(wu)料在(zai)熱風(feng)作用下(xia)快(kuai)速(su)行(xing)(xing)(xing)(xing)(xing)(xing)進排(pai)出滾(gun)(gun)(gun)筒,沒(mei)有達到干(gan)(gan)燥(zao)(zao)(zao)效(xiao)果的(de)(de)濕(shi)物(wu)料因自重而不(bu)能快(kuai)速(su)行(xing)(xing)(xing)(xing)(xing)(xing)進,物(wu)料在(zai)此矩形抄板(ban)內進行(xing)(xing)(xing)(xing)(xing)(xing)充分干(gan)(gan)燥(zao)(zao)(zao),由此達到干(gan)(gan)燥(zao)(zao)(zao)效(xiao)果,完成干(gan)(gan)燥(zao)(zao)(zao)過程。
設備特點
該(gai)設備(bei)與其他干燥設備(bei)相(xiang)比,生產能力大(da),可連(lian)續操(cao)作; 結構簡單,操(cao)作方(fang)便;故障少(shao),維修費用低;適(shi)用范(fan)圍廣,流體(ti)阻(zu)力小(xiao),可以用它干燥顆(ke)料狀物(wu)料,對(dui)于那些(xie)附著性(xing)大(da)的物(wu)料也很(hen)有利;操(cao)作彈性(xing)大(da),生產上(shang)允許產品的流量有較大(da)波動(dong)范(fan)圍,不(bu)會影響(xiang)產品的質量;清掃容易。