煤(mei)粉灰烘干機(ji)是煤(mei)粉經高(gao)溫燃燒后形成的一種似火山(shan)灰質混(hun)合材料。
它是燃(ran)燒(shao)(shao)煤(mei)(mei)的發(fa)電(dian)廠(chang)將煤(mei)(mei)磨成(cheng)100微米(mi)以下的煤(mei)(mei)粉,用(yong)預熱空氣噴入爐膛(tang)經燃(ran)燒(shao)(shao)形(xing)成(cheng)懸(xuan)浮狀態,產生混雜有大量不(bu)燃(ran)物的高溫煙氣,經集塵裝置捕集就得(de)到(dao)了粉煤(mei)(mei)灰。粉煤(mei)(mei)灰的化(hua)學組成(cheng)與(yu)粘(zhan)土質相似,主要成(cheng)分(fen)為(wei)二(er)氧化(hua)硅、三氧化(hua)二(er)鋁、三氧化(hua)二(er)鐵、氧化(hua)鈣和未燃(ran)盡碳(tan)。
工作原(yuan)理(li)
濕粉煤(mei)灰(hui)(hui)由供(gong)料(liao)裝(zhuang)置進(jin)(jin)(jin)(jin)入(ru)三層(ceng)滾(gun)筒(tong)(tong)的(de)內(nei)(nei)層(ceng),實現順流烘干, 粉煤(mei)灰(hui)(hui)在(zai)內(nei)(nei)層(ceng)的(de)抄(chao)板下(xia)不(bu)斷抄(chao)起、散(san)落呈螺旋行進(jin)(jin)(jin)(jin)式實現熱交換,物(wu)(wu)料(liao)移動(dong)至內(nei)(nei)層(ceng)的(de)另一端進(jin)(jin)(jin)(jin)入(ru)中(zhong)(zhong)層(ceng),進(jin)(jin)(jin)(jin)行逆流烘干,物(wu)(wu)料(liao)在(zai)中(zhong)(zhong)層(ceng)不(bu)斷地被反復(fu)揚進(jin)(jin)(jin)(jin),呈進(jin)(jin)(jin)(jin)兩步退一步的(de)行進(jin)(jin)(jin)(jin)方(fang)式,物(wu)(wu)料(liao)在(zai)中(zhong)(zhong)層(ceng)既充分(fen)吸收內(nei)(nei)層(ceng)滾(gun)筒(tong)(tong)散(san)發的(de)熱量(liang),又(you)吸收中(zhong)(zhong)層(ceng)滾(gun)筒(tong)(tong)的(de)熱量(liang),同(tong)時又(you)延長了(le)干燥(zao)(zao)(zao)時間(jian),物(wu)(wu)料(liao)在(zai)此達到(dao)干燥(zao)(zao)(zao)狀(zhuang)態。物(wu)(wu)料(liao)行至中(zhong)(zhong)層(ceng)另一端而(er)落入(ru)外(wai)(wai)層(ceng),物(wu)(wu)料(liao)在(zai)外(wai)(wai)層(ceng)滾(gun)筒(tong)(tong)內(nei)(nei)呈矩(ju)形多(duo)回路方(fang)式行進(jin)(jin)(jin)(jin),達到(dao)干燥(zao)(zao)(zao)效(xiao)(xiao)果(guo)的(de)物(wu)(wu)料(liao)在(zai)熱風作用(yong)下(xia)快速(su)行進(jin)(jin)(jin)(jin)排出(chu)滾(gun)筒(tong)(tong),沒有達到(dao)干燥(zao)(zao)(zao)效(xiao)(xiao)果(guo)的(de)濕物(wu)(wu)料(liao)因自重而(er)不(bu)能快速(su)行進(jin)(jin)(jin)(jin),物(wu)(wu)料(liao)在(zai)此矩(ju)形抄(chao)板內(nei)(nei)進(jin)(jin)(jin)(jin)行充分(fen)干燥(zao)(zao)(zao),由此達到(dao)干燥(zao)(zao)(zao)效(xiao)(xiao)果(guo),完(wan)成干燥(zao)(zao)(zao)過程。
設備特點
該設備(bei)與其他干燥設備(bei)相比,生產(chan)能力大,可連續(xu)操(cao)作(zuo); 結構簡(jian)單(dan),操(cao)作(zuo)方便;故障(zhang)少,維修費用(yong)低;適用(yong)范(fan)圍廣,流體阻力小,可以用(yong)它干燥顆料狀物(wu)料,對(dui)于(yu)那些附著性(xing)(xing)大的(de)物(wu)料也(ye)很有(you)利;操(cao)作(zuo)彈性(xing)(xing)大,生產(chan)上允許產(chan)品的(de)流量(liang)(liang)有(you)較大波(bo)動范(fan)圍,不會影響產(chan)品的(de)質量(liang)(liang);清(qing)掃容易。