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。
它是燃燒煤的發電廠(chang)將煤磨成(cheng)(cheng)100微米以下的煤粉,用預熱空氣(qi)(qi)噴(pen)入(ru)爐膛經燃燒形成(cheng)(cheng)懸(xuan)浮(fu)狀態,產生混雜有大量(liang)不(bu)燃物的高溫煙氣(qi)(qi),經集(ji)塵裝置捕集(ji)就得到了粉煤灰(hui)。粉煤灰(hui)的化學組成(cheng)(cheng)與(yu)粘土質相似,主要成(cheng)(cheng)分為二氧化硅、三氧化二鋁(lv)、三氧化二鐵、氧化鈣和(he)未(wei)燃盡碳。
工(gong)作原理
濕(shi)粉(fen)煤(mei)灰由(you)供料裝置進(jin)入三層(ceng)(ceng)(ceng)滾(gun)(gun)筒(tong)的(de)(de)(de)內層(ceng)(ceng)(ceng),實現順流(liu)烘干(gan)(gan)(gan), 粉(fen)煤(mei)灰在(zai)(zai)(zai)內層(ceng)(ceng)(ceng)的(de)(de)(de)抄板下(xia)不(bu)(bu)斷抄起、散落呈螺旋行(xing)進(jin)式(shi)實現熱(re)交(jiao)換,物(wu)(wu)(wu)料移動至內層(ceng)(ceng)(ceng)的(de)(de)(de)另一(yi)端進(jin)入中(zhong)(zhong)(zhong)層(ceng)(ceng)(ceng),進(jin)行(xing)逆流(liu)烘干(gan)(gan)(gan),物(wu)(wu)(wu)料在(zai)(zai)(zai)中(zhong)(zhong)(zhong)層(ceng)(ceng)(ceng)不(bu)(bu)斷地(di)被反復(fu)揚進(jin),呈進(jin)兩步(bu)(bu)退一(yi)步(bu)(bu)的(de)(de)(de)行(xing)進(jin)方式(shi),物(wu)(wu)(wu)料在(zai)(zai)(zai)中(zhong)(zhong)(zhong)層(ceng)(ceng)(ceng)既充分吸(xi)收內層(ceng)(ceng)(ceng)滾(gun)(gun)筒(tong)散發的(de)(de)(de)熱(re)量,又(you)吸(xi)收中(zhong)(zhong)(zhong)層(ceng)(ceng)(ceng)滾(gun)(gun)筒(tong)的(de)(de)(de)熱(re)量,同(tong)時又(you)延長了干(gan)(gan)(gan)燥時間(jian),物(wu)(wu)(wu)料在(zai)(zai)(zai)此(ci)達到干(gan)(gan)(gan)燥狀態(tai)。物(wu)(wu)(wu)料行(xing)至中(zhong)(zhong)(zhong)層(ceng)(ceng)(ceng)另一(yi)端而(er)落入外層(ceng)(ceng)(ceng),物(wu)(wu)(wu)料在(zai)(zai)(zai)外層(ceng)(ceng)(ceng)滾(gun)(gun)筒(tong)內呈矩(ju)形(xing)多回路方式(shi)行(xing)進(jin),達到干(gan)(gan)(gan)燥效(xiao)(xiao)果的(de)(de)(de)物(wu)(wu)(wu)料在(zai)(zai)(zai)熱(re)風作用下(xia)快速行(xing)進(jin)排出滾(gun)(gun)筒(tong),沒有達到干(gan)(gan)(gan)燥效(xiao)(xiao)果的(de)(de)(de)濕(shi)物(wu)(wu)(wu)料因自重而(er)不(bu)(bu)能快速行(xing)進(jin),物(wu)(wu)(wu)料在(zai)(zai)(zai)此(ci)矩(ju)形(xing)抄板內進(jin)行(xing)充分干(gan)(gan)(gan)燥,由(you)此(ci)達到干(gan)(gan)(gan)燥效(xiao)(xiao)果,完(wan)成干(gan)(gan)(gan)燥過程(cheng)。
設備特點
該(gai)設備(bei)(bei)與其他干燥(zao)設備(bei)(bei)相比,生(sheng)產(chan)能(neng)力大(da),可(ke)連續(xu)操作; 結構簡(jian)單(dan),操作方便;故障少,維修費(fei)用低;適用范(fan)圍(wei)廣,流體阻(zu)力小(xiao),可(ke)以用它干燥(zao)顆料狀(zhuang)物(wu)料,對于那(nei)些(xie)附著性大(da)的(de)物(wu)料也很(hen)有利;操作彈性大(da),生(sheng)產(chan)上允許產(chan)品的(de)流量有較大(da)波動(dong)范(fan)圍(wei),不會(hui)影響產(chan)品的(de)質量;清掃(sao)容易。