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(fa)電廠將煤磨成100微米(mi)以(yi)下的煤粉,用預熱空氣噴入(ru)爐(lu)膛經(jing)燃(ran)燒形成懸浮狀(zhuang)態,產(chan)生混雜有大量(liang)不(bu)燃(ran)物的高溫煙氣,經(jing)集塵裝置捕集就得到了粉煤灰(hui)。粉煤灰(hui)的化學(xue)組成與粘土質(zhi)相似,主要(yao)成分為二氧(yang)(yang)化硅、三(san)氧(yang)(yang)化二鋁、三(san)氧(yang)(yang)化二鐵、氧(yang)(yang)化鈣和未燃(ran)盡碳(tan)。
工作原理
濕粉煤(mei)灰由供(gong)料(liao)裝(zhuang)置進(jin)(jin)(jin)入(ru)三層(ceng)(ceng)(ceng)(ceng)滾(gun)(gun)(gun)筒(tong)的(de)內(nei)層(ceng)(ceng)(ceng)(ceng),實(shi)現(xian)順(shun)流烘干(gan)(gan), 粉煤(mei)灰在(zai)內(nei)層(ceng)(ceng)(ceng)(ceng)的(de)抄板下(xia)不斷抄起、散落(luo)呈(cheng)(cheng)螺(luo)旋(xuan)行(xing)(xing)進(jin)(jin)(jin)式實(shi)現(xian)熱(re)(re)交換,物(wu)(wu)料(liao)移動至(zhi)內(nei)層(ceng)(ceng)(ceng)(ceng)的(de)另一端進(jin)(jin)(jin)入(ru)中(zhong)層(ceng)(ceng)(ceng)(ceng),進(jin)(jin)(jin)行(xing)(xing)逆流烘干(gan)(gan),物(wu)(wu)料(liao)在(zai)中(zhong)層(ceng)(ceng)(ceng)(ceng)不斷地(di)被反復揚進(jin)(jin)(jin),呈(cheng)(cheng)進(jin)(jin)(jin)兩步(bu)退(tui)一步(bu)的(de)行(xing)(xing)進(jin)(jin)(jin)方式,物(wu)(wu)料(liao)在(zai)中(zhong)層(ceng)(ceng)(ceng)(ceng)既充分吸收內(nei)層(ceng)(ceng)(ceng)(ceng)滾(gun)(gun)(gun)筒(tong)散發的(de)熱(re)(re)量,又(you)吸收中(zhong)層(ceng)(ceng)(ceng)(ceng)滾(gun)(gun)(gun)筒(tong)的(de)熱(re)(re)量,同時又(you)延長了干(gan)(gan)燥(zao)時間,物(wu)(wu)料(liao)在(zai)此(ci)達到(dao)干(gan)(gan)燥(zao)狀態。物(wu)(wu)料(liao)行(xing)(xing)至(zhi)中(zhong)層(ceng)(ceng)(ceng)(ceng)另一端而落(luo)入(ru)外(wai)層(ceng)(ceng)(ceng)(ceng),物(wu)(wu)料(liao)在(zai)外(wai)層(ceng)(ceng)(ceng)(ceng)滾(gun)(gun)(gun)筒(tong)內(nei)呈(cheng)(cheng)矩形(xing)多回路方式行(xing)(xing)進(jin)(jin)(jin),達到(dao)干(gan)(gan)燥(zao)效(xiao)果(guo)的(de)物(wu)(wu)料(liao)在(zai)熱(re)(re)風(feng)作用下(xia)快速(su)行(xing)(xing)進(jin)(jin)(jin)排出滾(gun)(gun)(gun)筒(tong),沒有達到(dao)干(gan)(gan)燥(zao)效(xiao)果(guo)的(de)濕物(wu)(wu)料(liao)因自(zi)重而不能快速(su)行(xing)(xing)進(jin)(jin)(jin),物(wu)(wu)料(liao)在(zai)此(ci)矩形(xing)抄板內(nei)進(jin)(jin)(jin)行(xing)(xing)充分干(gan)(gan)燥(zao),由此(ci)達到(dao)干(gan)(gan)燥(zao)效(xiao)果(guo),完成干(gan)(gan)燥(zao)過(guo)程。
設備特點
該(gai)設(she)備(bei)與(yu)其他干燥設(she)備(bei)相比,生(sheng)產(chan)能(neng)力大(da),可連續操作(zuo); 結構簡單,操作(zuo)方便;故(gu)障少,維修費用(yong)低;適用(yong)范圍廣,流(liu)體阻(zu)力小,可以用(yong)它(ta)干燥顆料狀物料,對于那些附著(zhu)性大(da)的物料也很(hen)有利(li);操作(zuo)彈(dan)性大(da),生(sheng)產(chan)上允許(xu)產(chan)品的流(liu)量有較大(da)波動范圍,不會影響(xiang)產(chan)品的質量;清掃容易。