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。
它是燃燒煤(mei)的發(fa)電廠(chang)將煤(mei)磨成100微米以下的煤(mei)粉(fen),用預熱空氣(qi)噴入爐膛經燃燒形成懸浮狀態(tai),產生(sheng)混(hun)雜有大量不燃物的高溫煙氣(qi),經集塵裝置捕集就得(de)到(dao)了粉(fen)煤(mei)灰。粉(fen)煤(mei)灰的化(hua)學組(zu)成與粘土質相似,主要成分(fen)為二(er)(er)氧(yang)(yang)化(hua)硅、三(san)氧(yang)(yang)化(hua)二(er)(er)鋁、三(san)氧(yang)(yang)化(hua)二(er)(er)鐵、氧(yang)(yang)化(hua)鈣和未燃盡碳。
工(gong)作(zuo)原(yuan)理
濕粉(fen)煤灰由(you)供料(liao)(liao)裝置進(jin)(jin)(jin)(jin)入(ru)(ru)三層(ceng)滾(gun)筒(tong)的(de)內(nei)(nei)層(ceng),實現順流烘(hong)干(gan), 粉(fen)煤灰在內(nei)(nei)層(ceng)的(de)抄板(ban)下不斷(duan)抄起、散落呈螺旋行(xing)(xing)(xing)進(jin)(jin)(jin)(jin)式實現熱交換(huan),物(wu)料(liao)(liao)移動(dong)至內(nei)(nei)層(ceng)的(de)另(ling)一端(duan)進(jin)(jin)(jin)(jin)入(ru)(ru)中(zhong)(zhong)層(ceng),進(jin)(jin)(jin)(jin)行(xing)(xing)(xing)逆流烘(hong)干(gan),物(wu)料(liao)(liao)在中(zhong)(zhong)層(ceng)不斷(duan)地被反復揚進(jin)(jin)(jin)(jin),呈進(jin)(jin)(jin)(jin)兩步退一步的(de)行(xing)(xing)(xing)進(jin)(jin)(jin)(jin)方式,物(wu)料(liao)(liao)在中(zhong)(zhong)層(ceng)既充分(fen)吸收內(nei)(nei)層(ceng)滾(gun)筒(tong)散發的(de)熱量(liang),又(you)吸收中(zhong)(zhong)層(ceng)滾(gun)筒(tong)的(de)熱量(liang),同時又(you)延長了(le)干(gan)燥(zao)(zao)時間,物(wu)料(liao)(liao)在此達到(dao)干(gan)燥(zao)(zao)狀態。物(wu)料(liao)(liao)行(xing)(xing)(xing)至中(zhong)(zhong)層(ceng)另(ling)一端(duan)而落入(ru)(ru)外(wai)層(ceng),物(wu)料(liao)(liao)在外(wai)層(ceng)滾(gun)筒(tong)內(nei)(nei)呈矩形(xing)多回路方式行(xing)(xing)(xing)進(jin)(jin)(jin)(jin),達到(dao)干(gan)燥(zao)(zao)效(xiao)果的(de)物(wu)料(liao)(liao)在熱風作用下快(kuai)速行(xing)(xing)(xing)進(jin)(jin)(jin)(jin)排出滾(gun)筒(tong),沒有達到(dao)干(gan)燥(zao)(zao)效(xiao)果的(de)濕物(wu)料(liao)(liao)因自(zi)重(zhong)而不能快(kuai)速行(xing)(xing)(xing)進(jin)(jin)(jin)(jin),物(wu)料(liao)(liao)在此矩形(xing)抄板(ban)內(nei)(nei)進(jin)(jin)(jin)(jin)行(xing)(xing)(xing)充分(fen)干(gan)燥(zao)(zao),由(you)此達到(dao)干(gan)燥(zao)(zao)效(xiao)果,完成干(gan)燥(zao)(zao)過程(cheng)。
設備特點
該(gai)設備與其他干燥設備相比,生產能(neng)力大(da)(da)(da),可連續操(cao)(cao)作; 結構簡單,操(cao)(cao)作方便;故障少,維修費(fei)用低;適(shi)用范圍廣,流(liu)體阻力小,可以用它(ta)干燥顆(ke)料狀物料,對(dui)于那些附(fu)著性大(da)(da)(da)的(de)物料也很有利;操(cao)(cao)作彈性大(da)(da)(da),生產上允(yun)許產品(pin)的(de)流(liu)量(liang)有較大(da)(da)(da)波動范圍,不會影響產品(pin)的(de)質量(liang);清掃容易。