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(de)發電廠將(jiang)煤磨成100微米以下的(de)煤粉(fen),用預熱空氣噴入爐膛經(jing)燃(ran)燒形(xing)成懸浮(fu)狀態,產生(sheng)混雜有大量不燃(ran)物的(de)高溫煙氣,經(jing)集塵裝置(zhi)捕集就(jiu)得到(dao)了粉(fen)煤灰。粉(fen)煤灰的(de)化(hua)學組成與粘土質(zhi)相似,主要(yao)成分為二(er)(er)氧化(hua)硅(gui)、三(san)氧化(hua)二(er)(er)鋁、三(san)氧化(hua)二(er)(er)鐵(tie)、氧化(hua)鈣和未燃(ran)盡碳。
工(gong)作(zuo)原理
濕(shi)粉(fen)煤(mei)灰由供料(liao)裝置進(jin)入(ru)三層(ceng)(ceng)(ceng)滾(gun)(gun)筒(tong)(tong)的(de)(de)(de)(de)(de)內層(ceng)(ceng)(ceng),實現順流烘干(gan), 粉(fen)煤(mei)灰在(zai)(zai)(zai)內層(ceng)(ceng)(ceng)的(de)(de)(de)(de)(de)抄(chao)(chao)板下不(bu)斷抄(chao)(chao)起、散(san)落(luo)呈螺旋(xuan)行(xing)(xing)(xing)進(jin)式(shi)實現熱交換,物(wu)(wu)料(liao)移動至(zhi)內層(ceng)(ceng)(ceng)的(de)(de)(de)(de)(de)另一端進(jin)入(ru)中(zhong)(zhong)(zhong)層(ceng)(ceng)(ceng),進(jin)行(xing)(xing)(xing)逆(ni)流烘干(gan),物(wu)(wu)料(liao)在(zai)(zai)(zai)中(zhong)(zhong)(zhong)層(ceng)(ceng)(ceng)不(bu)斷地被反復揚(yang)進(jin),呈進(jin)兩步退一步的(de)(de)(de)(de)(de)行(xing)(xing)(xing)進(jin)方式(shi),物(wu)(wu)料(liao)在(zai)(zai)(zai)中(zhong)(zhong)(zhong)層(ceng)(ceng)(ceng)既充分(fen)吸收內層(ceng)(ceng)(ceng)滾(gun)(gun)筒(tong)(tong)散(san)發的(de)(de)(de)(de)(de)熱量(liang),又吸收中(zhong)(zhong)(zhong)層(ceng)(ceng)(ceng)滾(gun)(gun)筒(tong)(tong)的(de)(de)(de)(de)(de)熱量(liang),同時(shi)又延長了干(gan)燥(zao)時(shi)間,物(wu)(wu)料(liao)在(zai)(zai)(zai)此達到(dao)干(gan)燥(zao)狀態。物(wu)(wu)料(liao)行(xing)(xing)(xing)至(zhi)中(zhong)(zhong)(zhong)層(ceng)(ceng)(ceng)另一端而落(luo)入(ru)外層(ceng)(ceng)(ceng),物(wu)(wu)料(liao)在(zai)(zai)(zai)外層(ceng)(ceng)(ceng)滾(gun)(gun)筒(tong)(tong)內呈矩(ju)(ju)形(xing)多回路方式(shi)行(xing)(xing)(xing)進(jin),達到(dao)干(gan)燥(zao)效果的(de)(de)(de)(de)(de)物(wu)(wu)料(liao)在(zai)(zai)(zai)熱風作用下快速行(xing)(xing)(xing)進(jin)排出滾(gun)(gun)筒(tong)(tong),沒有達到(dao)干(gan)燥(zao)效果的(de)(de)(de)(de)(de)濕(shi)物(wu)(wu)料(liao)因自重而不(bu)能快速行(xing)(xing)(xing)進(jin),物(wu)(wu)料(liao)在(zai)(zai)(zai)此矩(ju)(ju)形(xing)抄(chao)(chao)板內進(jin)行(xing)(xing)(xing)充分(fen)干(gan)燥(zao),由此達到(dao)干(gan)燥(zao)效果,完成干(gan)燥(zao)過(guo)程。
設備特點(dian)
該(gai)設(she)備與(yu)其他(ta)干燥設(she)備相比,生產(chan)能力大(da),可連續操作; 結構簡單,操作方便;故障少(shao),維(wei)修費用低;適用范(fan)圍廣,流體(ti)阻(zu)力小,可以用它干燥顆料狀物料,對(dui)于那些附(fu)著性大(da)的物料也(ye)很有利;操作彈性大(da),生產(chan)上允(yun)許產(chan)品的流量有較大(da)波動范(fan)圍,不(bu)會影響產(chan)品的質量;清掃容易。