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。
它是燃燒煤的(de)發(fa)電廠將煤磨成(cheng)100微米以下的(de)煤粉(fen)(fen),用預熱(re)空氣噴入(ru)爐膛(tang)經(jing)燃燒形成(cheng)懸(xuan)浮狀態,產生(sheng)混雜(za)有大量不燃物的(de)高(gao)溫煙氣,經(jing)集塵裝置捕集就(jiu)得(de)到了粉(fen)(fen)煤灰。粉(fen)(fen)煤灰的(de)化(hua)學組成(cheng)與粘土質(zhi)相似,主(zhu)要成(cheng)分為二氧(yang)化(hua)硅(gui)、三氧(yang)化(hua)二鋁、三氧(yang)化(hua)二鐵、氧(yang)化(hua)鈣和(he)未(wei)燃盡碳。
工作原(yuan)理
濕粉煤灰由供料(liao)(liao)裝(zhuang)置(zhi)進(jin)(jin)入(ru)三(san)層(ceng)(ceng)(ceng)(ceng)滾(gun)(gun)(gun)筒的(de)(de)內層(ceng)(ceng)(ceng)(ceng),實(shi)現(xian)(xian)順流烘干(gan), 粉煤灰在(zai)(zai)內層(ceng)(ceng)(ceng)(ceng)的(de)(de)抄(chao)(chao)板下不(bu)斷抄(chao)(chao)起、散落呈螺旋行(xing)進(jin)(jin)式實(shi)現(xian)(xian)熱(re)交換,物料(liao)(liao)移動至內層(ceng)(ceng)(ceng)(ceng)的(de)(de)另(ling)一(yi)端進(jin)(jin)入(ru)中(zhong)(zhong)(zhong)層(ceng)(ceng)(ceng)(ceng),進(jin)(jin)行(xing)逆流烘干(gan),物料(liao)(liao)在(zai)(zai)中(zhong)(zhong)(zhong)層(ceng)(ceng)(ceng)(ceng)不(bu)斷地被反復揚進(jin)(jin),呈進(jin)(jin)兩步(bu)退一(yi)步(bu)的(de)(de)行(xing)進(jin)(jin)方式,物料(liao)(liao)在(zai)(zai)中(zhong)(zhong)(zhong)層(ceng)(ceng)(ceng)(ceng)既充(chong)分(fen)吸收內層(ceng)(ceng)(ceng)(ceng)滾(gun)(gun)(gun)筒散發的(de)(de)熱(re)量(liang),又吸收中(zhong)(zhong)(zhong)層(ceng)(ceng)(ceng)(ceng)滾(gun)(gun)(gun)筒的(de)(de)熱(re)量(liang),同(tong)時又延長了干(gan)燥時間(jian),物料(liao)(liao)在(zai)(zai)此(ci)達到(dao)干(gan)燥狀態(tai)。物料(liao)(liao)行(xing)至中(zhong)(zhong)(zhong)層(ceng)(ceng)(ceng)(ceng)另(ling)一(yi)端而落入(ru)外層(ceng)(ceng)(ceng)(ceng),物料(liao)(liao)在(zai)(zai)外層(ceng)(ceng)(ceng)(ceng)滾(gun)(gun)(gun)筒內呈矩形多回路方式行(xing)進(jin)(jin),達到(dao)干(gan)燥效(xiao)果(guo)的(de)(de)物料(liao)(liao)在(zai)(zai)熱(re)風(feng)作用下快速行(xing)進(jin)(jin)排出滾(gun)(gun)(gun)筒,沒有(you)達到(dao)干(gan)燥效(xiao)果(guo)的(de)(de)濕物料(liao)(liao)因自重(zhong)而不(bu)能快速行(xing)進(jin)(jin),物料(liao)(liao)在(zai)(zai)此(ci)矩形抄(chao)(chao)板內進(jin)(jin)行(xing)充(chong)分(fen)干(gan)燥,由此(ci)達到(dao)干(gan)燥效(xiao)果(guo),完成干(gan)燥過(guo)程。
設備特點(dian)
該設備與(yu)其他(ta)干燥設備相(xiang)比(bi),生產能(neng)力(li)大(da),可連續操(cao)作; 結構簡單,操(cao)作方便;故障少,維(wei)修(xiu)費用(yong)低;適用(yong)范(fan)圍廣,流(liu)體阻力(li)小,可以用(yong)它干燥顆料(liao)(liao)狀物料(liao)(liao),對(dui)于那些附(fu)著性(xing)大(da)的(de)物料(liao)(liao)也(ye)很(hen)有利(li);操(cao)作彈(dan)性(xing)大(da),生產上(shang)允許產品的(de)流(liu)量有較大(da)波動(dong)范(fan)圍,不會(hui)影響產品的(de)質量;清掃容易。