煤粉(fen)灰(hui)烘干機是(shi)煤粉(fen)經(jing)高溫燃(ran)燒后(hou)形成的一種似火山灰(hui)質混(hun)合材(cai)料。
它是燃燒煤(mei)(mei)的發電廠(chang)將(jiang)煤(mei)(mei)磨成100微(wei)米以下的煤(mei)(mei)粉,用預熱空氣(qi)噴入爐膛經燃燒形成懸浮狀態,產生混雜有大量不燃物的高溫煙氣(qi),經集塵裝(zhuang)置捕(bu)集就得(de)到了粉煤(mei)(mei)灰。粉煤(mei)(mei)灰的化(hua)學組成與(yu)粘土質(zhi)相似,主(zhu)要成分為二氧化(hua)硅、三(san)氧化(hua)二鋁(lv)、三(san)氧化(hua)二鐵、氧化(hua)鈣(gai)和未燃盡碳。
工(gong)作原(yuan)理
濕粉煤(mei)(mei)灰由供料(liao)(liao)裝置(zhi)進(jin)(jin)(jin)入三層(ceng)(ceng)(ceng)滾(gun)筒(tong)(tong)的內層(ceng)(ceng)(ceng),實(shi)現順流烘(hong)干(gan), 粉煤(mei)(mei)灰在內層(ceng)(ceng)(ceng)的抄板下(xia)不(bu)斷抄起(qi)、散落呈螺旋行(xing)(xing)(xing)(xing)進(jin)(jin)(jin)式(shi)實(shi)現熱交換(huan),物料(liao)(liao)移(yi)動至(zhi)(zhi)內層(ceng)(ceng)(ceng)的另一端進(jin)(jin)(jin)入中層(ceng)(ceng)(ceng),進(jin)(jin)(jin)行(xing)(xing)(xing)(xing)逆流烘(hong)干(gan),物料(liao)(liao)在中層(ceng)(ceng)(ceng)不(bu)斷地被反復揚進(jin)(jin)(jin),呈進(jin)(jin)(jin)兩步退(tui)一步的行(xing)(xing)(xing)(xing)進(jin)(jin)(jin)方式(shi),物料(liao)(liao)在中層(ceng)(ceng)(ceng)既充分吸(xi)收(shou)內層(ceng)(ceng)(ceng)滾(gun)筒(tong)(tong)散發的熱量,又吸(xi)收(shou)中層(ceng)(ceng)(ceng)滾(gun)筒(tong)(tong)的熱量,同時又延長了干(gan)燥時間,物料(liao)(liao)在此達(da)到(dao)(dao)(dao)干(gan)燥狀態。物料(liao)(liao)行(xing)(xing)(xing)(xing)至(zhi)(zhi)中層(ceng)(ceng)(ceng)另一端而落入外層(ceng)(ceng)(ceng),物料(liao)(liao)在外層(ceng)(ceng)(ceng)滾(gun)筒(tong)(tong)內呈矩形(xing)多(duo)回(hui)路方式(shi)行(xing)(xing)(xing)(xing)進(jin)(jin)(jin),達(da)到(dao)(dao)(dao)干(gan)燥效果(guo)的物料(liao)(liao)在熱風(feng)作用下(xia)快(kuai)速(su)行(xing)(xing)(xing)(xing)進(jin)(jin)(jin)排出滾(gun)筒(tong)(tong),沒有達(da)到(dao)(dao)(dao)干(gan)燥效果(guo)的濕物料(liao)(liao)因自重而不(bu)能快(kuai)速(su)行(xing)(xing)(xing)(xing)進(jin)(jin)(jin),物料(liao)(liao)在此矩形(xing)抄板內進(jin)(jin)(jin)行(xing)(xing)(xing)(xing)充分干(gan)燥,由此達(da)到(dao)(dao)(dao)干(gan)燥效果(guo),完(wan)成(cheng)干(gan)燥過程。
設備特點
該設備與其他干燥(zao)設備相比,生(sheng)(sheng)產(chan)能力(li)大,可(ke)連續操作; 結構簡(jian)單,操作方便;故障少(shao),維修(xiu)費用低;適用范圍廣(guang),流體(ti)阻力(li)小,可(ke)以用它干燥(zao)顆料狀物料,對(dui)于那些附著(zhu)性大的物料也(ye)很有利;操作彈性大,生(sheng)(sheng)產(chan)上允許(xu)產(chan)品(pin)的流量(liang)有較大波動范圍,不會影(ying)響產(chan)品(pin)的質(zhi)量(liang);清掃容(rong)易。