煤(mei)粉灰(hui)烘干機是煤(mei)粉經高溫(wen)燃(ran)燒后形成的一種似火山灰(hui)質混合(he)材料。
它是燃(ran)燒煤(mei)(mei)的(de)(de)(de)發(fa)電(dian)廠將煤(mei)(mei)磨成(cheng)100微米以下的(de)(de)(de)煤(mei)(mei)粉,用預熱空氣噴入(ru)爐(lu)膛經(jing)燃(ran)燒形成(cheng)懸(xuan)浮狀態,產生(sheng)混雜有大(da)量不(bu)燃(ran)物的(de)(de)(de)高溫煙氣,經(jing)集塵裝置捕集就得到了粉煤(mei)(mei)灰。粉煤(mei)(mei)灰的(de)(de)(de)化學組成(cheng)與粘土質相似,主要成(cheng)分為二(er)氧化硅(gui)、三(san)氧化二(er)鋁、三(san)氧化二(er)鐵、氧化鈣(gai)和未燃(ran)盡碳(tan)。
工(gong)作原(yuan)理
濕粉煤灰由供料(liao)(liao)(liao)裝置進(jin)入三層(ceng)(ceng)(ceng)滾(gun)筒(tong)的(de)內(nei)層(ceng)(ceng)(ceng),實現(xian)(xian)順流(liu)烘(hong)干, 粉煤灰在(zai)內(nei)層(ceng)(ceng)(ceng)的(de)抄(chao)(chao)板(ban)下不斷抄(chao)(chao)起(qi)、散落(luo)呈(cheng)(cheng)螺旋行(xing)(xing)(xing)進(jin)式實現(xian)(xian)熱交換,物(wu)(wu)(wu)料(liao)(liao)(liao)移動至內(nei)層(ceng)(ceng)(ceng)的(de)另(ling)一(yi)端進(jin)入中(zhong)層(ceng)(ceng)(ceng),進(jin)行(xing)(xing)(xing)逆流(liu)烘(hong)干,物(wu)(wu)(wu)料(liao)(liao)(liao)在(zai)中(zhong)層(ceng)(ceng)(ceng)不斷地(di)被反(fan)復揚進(jin),呈(cheng)(cheng)進(jin)兩步退一(yi)步的(de)行(xing)(xing)(xing)進(jin)方式,物(wu)(wu)(wu)料(liao)(liao)(liao)在(zai)中(zhong)層(ceng)(ceng)(ceng)既充(chong)分吸收(shou)內(nei)層(ceng)(ceng)(ceng)滾(gun)筒(tong)散發(fa)的(de)熱量,又吸收(shou)中(zhong)層(ceng)(ceng)(ceng)滾(gun)筒(tong)的(de)熱量,同時(shi)又延長(chang)了干燥時(shi)間,物(wu)(wu)(wu)料(liao)(liao)(liao)在(zai)此達(da)到(dao)(dao)(dao)干燥狀(zhuang)態。物(wu)(wu)(wu)料(liao)(liao)(liao)行(xing)(xing)(xing)至中(zhong)層(ceng)(ceng)(ceng)另(ling)一(yi)端而落(luo)入外層(ceng)(ceng)(ceng),物(wu)(wu)(wu)料(liao)(liao)(liao)在(zai)外層(ceng)(ceng)(ceng)滾(gun)筒(tong)內(nei)呈(cheng)(cheng)矩形(xing)多回路方式行(xing)(xing)(xing)進(jin),達(da)到(dao)(dao)(dao)干燥效(xiao)(xiao)果(guo)的(de)物(wu)(wu)(wu)料(liao)(liao)(liao)在(zai)熱風作(zuo)用(yong)下快(kuai)速行(xing)(xing)(xing)進(jin)排出滾(gun)筒(tong),沒有達(da)到(dao)(dao)(dao)干燥效(xiao)(xiao)果(guo)的(de)濕物(wu)(wu)(wu)料(liao)(liao)(liao)因自重而不能快(kuai)速行(xing)(xing)(xing)進(jin),物(wu)(wu)(wu)料(liao)(liao)(liao)在(zai)此矩形(xing)抄(chao)(chao)板(ban)內(nei)進(jin)行(xing)(xing)(xing)充(chong)分干燥,由此達(da)到(dao)(dao)(dao)干燥效(xiao)(xiao)果(guo),完(wan)成干燥過程。
設(she)備特點
該(gai)設(she)備(bei)與其(qi)他干燥設(she)備(bei)相比,生產(chan)能力大(da),可(ke)連續操作(zuo); 結構簡單(dan),操作(zuo)方便;故障少(shao),維修費用(yong)低;適用(yong)范(fan)圍(wei)廣,流體阻力小(xiao),可(ke)以(yi)用(yong)它干燥顆料狀(zhuang)物料,對于那些附著性(xing)大(da)的物料也很有利;操作(zuo)彈性(xing)大(da),生產(chan)上允許產(chan)品的流量有較大(da)波動(dong)范(fan)圍(wei),不會影響產(chan)品的質量;清掃容易。