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(shao)煤的發電廠將煤磨成(cheng)100微(wei)米以下的煤粉(fen),用預熱空氣噴入(ru)爐膛(tang)經(jing)(jing)燃燒(shao)形成(cheng)懸浮(fu)狀態,產(chan)生(sheng)混雜(za)有大量不燃物(wu)的高溫(wen)煙氣,經(jing)(jing)集塵裝置捕集就(jiu)得到(dao)了粉(fen)煤灰。粉(fen)煤灰的化(hua)學組成(cheng)與粘土質相似,主要成(cheng)分(fen)為二氧化(hua)硅、三(san)氧化(hua)二鋁、三(san)氧化(hua)二鐵、氧化(hua)鈣和未燃盡碳。
工作原理
濕粉煤灰由(you)供料(liao)裝置進(jin)入(ru)三層(ceng)滾(gun)(gun)筒(tong)(tong)的(de)內層(ceng),實(shi)現(xian)順流(liu)烘干(gan)(gan)(gan), 粉煤灰在(zai)(zai)(zai)內層(ceng)的(de)抄板下不斷抄起、散落(luo)呈螺旋行(xing)(xing)(xing)(xing)進(jin)式實(shi)現(xian)熱交(jiao)換,物(wu)(wu)(wu)(wu)料(liao)移動至內層(ceng)的(de)另一(yi)(yi)端(duan)進(jin)入(ru)中(zhong)(zhong)層(ceng),進(jin)行(xing)(xing)(xing)(xing)逆流(liu)烘干(gan)(gan)(gan),物(wu)(wu)(wu)(wu)料(liao)在(zai)(zai)(zai)中(zhong)(zhong)層(ceng)不斷地被反復揚進(jin),呈進(jin)兩步退一(yi)(yi)步的(de)行(xing)(xing)(xing)(xing)進(jin)方式,物(wu)(wu)(wu)(wu)料(liao)在(zai)(zai)(zai)中(zhong)(zhong)層(ceng)既充分吸(xi)收(shou)內層(ceng)滾(gun)(gun)筒(tong)(tong)散發的(de)熱量,又吸(xi)收(shou)中(zhong)(zhong)層(ceng)滾(gun)(gun)筒(tong)(tong)的(de)熱量,同(tong)時(shi)(shi)又延(yan)長(chang)了干(gan)(gan)(gan)燥(zao)時(shi)(shi)間,物(wu)(wu)(wu)(wu)料(liao)在(zai)(zai)(zai)此達到(dao)干(gan)(gan)(gan)燥(zao)狀態。物(wu)(wu)(wu)(wu)料(liao)行(xing)(xing)(xing)(xing)至中(zhong)(zhong)層(ceng)另一(yi)(yi)端(duan)而落(luo)入(ru)外層(ceng),物(wu)(wu)(wu)(wu)料(liao)在(zai)(zai)(zai)外層(ceng)滾(gun)(gun)筒(tong)(tong)內呈矩(ju)形多回路方式行(xing)(xing)(xing)(xing)進(jin),達到(dao)干(gan)(gan)(gan)燥(zao)效(xiao)果(guo)的(de)物(wu)(wu)(wu)(wu)料(liao)在(zai)(zai)(zai)熱風作用下快速行(xing)(xing)(xing)(xing)進(jin)排出滾(gun)(gun)筒(tong)(tong),沒有達到(dao)干(gan)(gan)(gan)燥(zao)效(xiao)果(guo)的(de)濕物(wu)(wu)(wu)(wu)料(liao)因自重而不能(neng)快速行(xing)(xing)(xing)(xing)進(jin),物(wu)(wu)(wu)(wu)料(liao)在(zai)(zai)(zai)此矩(ju)形抄板內進(jin)行(xing)(xing)(xing)(xing)充分干(gan)(gan)(gan)燥(zao),由(you)此達到(dao)干(gan)(gan)(gan)燥(zao)效(xiao)果(guo),完成干(gan)(gan)(gan)燥(zao)過程(cheng)。
設備(bei)特點(dian)
該(gai)設(she)備(bei)(bei)與其他(ta)干(gan)燥(zao)設(she)備(bei)(bei)相比,生產能力大,可連續操(cao)作(zuo); 結構簡單(dan),操(cao)作(zuo)方便;故(gu)障少,維修費(fei)用(yong)低;適用(yong)范圍廣,流(liu)體阻力小,可以用(yong)它干(gan)燥(zao)顆料狀物(wu)料,對于那(nei)些附著性大的物(wu)料也很(hen)有利;操(cao)作(zuo)彈(dan)性大,生產上允(yun)許產品的流(liu)量有較大波動范圍,不會影響產品的質(zhi)量;清(qing)掃容易。