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(shi)燃(ran)燒煤的發電廠將煤磨(mo)成100微(wei)(wei)米以下的煤粉,用預熱(re)空氣(qi)噴入(ru)爐膛經燃(ran)燒形成懸浮(fu)狀(zhuang)態,產生(sheng)混雜有大量不燃(ran)物的高(gao)溫(wen)煙氣(qi),經集(ji)塵裝置捕集(ji)就得到(dao)了粉煤灰(hui)。粉煤灰(hui)的化(hua)(hua)學組成與粘土質相似,主要(yao)成分為二(er)氧化(hua)(hua)硅(gui)、三(san)氧化(hua)(hua)二(er)鋁、三(san)氧化(hua)(hua)二(er)鐵、氧化(hua)(hua)鈣和未燃(ran)盡碳。
工作原理
濕粉煤灰由供料(liao)(liao)裝(zhuang)置進(jin)(jin)(jin)入三層(ceng)(ceng)(ceng)(ceng)滾(gun)筒的(de)(de)內(nei)層(ceng)(ceng)(ceng)(ceng),實現順(shun)流烘干(gan), 粉煤灰在內(nei)層(ceng)(ceng)(ceng)(ceng)的(de)(de)抄(chao)板下(xia)不(bu)斷抄(chao)起、散(san)落呈(cheng)(cheng)螺旋行(xing)(xing)進(jin)(jin)(jin)式(shi)實現熱交換,物(wu)(wu)(wu)(wu)料(liao)(liao)移動至內(nei)層(ceng)(ceng)(ceng)(ceng)的(de)(de)另一(yi)端進(jin)(jin)(jin)入中(zhong)層(ceng)(ceng)(ceng)(ceng),進(jin)(jin)(jin)行(xing)(xing)逆流烘干(gan),物(wu)(wu)(wu)(wu)料(liao)(liao)在中(zhong)層(ceng)(ceng)(ceng)(ceng)不(bu)斷地被(bei)反復揚進(jin)(jin)(jin),呈(cheng)(cheng)進(jin)(jin)(jin)兩步退一(yi)步的(de)(de)行(xing)(xing)進(jin)(jin)(jin)方式(shi),物(wu)(wu)(wu)(wu)料(liao)(liao)在中(zhong)層(ceng)(ceng)(ceng)(ceng)既充分吸(xi)收內(nei)層(ceng)(ceng)(ceng)(ceng)滾(gun)筒散(san)發(fa)的(de)(de)熱量,又吸(xi)收中(zhong)層(ceng)(ceng)(ceng)(ceng)滾(gun)筒的(de)(de)熱量,同時(shi)又延長了干(gan)燥(zao)時(shi)間,物(wu)(wu)(wu)(wu)料(liao)(liao)在此(ci)達到(dao)干(gan)燥(zao)狀(zhuang)態。物(wu)(wu)(wu)(wu)料(liao)(liao)行(xing)(xing)至中(zhong)層(ceng)(ceng)(ceng)(ceng)另一(yi)端而(er)落入外層(ceng)(ceng)(ceng)(ceng),物(wu)(wu)(wu)(wu)料(liao)(liao)在外層(ceng)(ceng)(ceng)(ceng)滾(gun)筒內(nei)呈(cheng)(cheng)矩(ju)形多回路方式(shi)行(xing)(xing)進(jin)(jin)(jin),達到(dao)干(gan)燥(zao)效果的(de)(de)物(wu)(wu)(wu)(wu)料(liao)(liao)在熱風作用下(xia)快速行(xing)(xing)進(jin)(jin)(jin)排(pai)出滾(gun)筒,沒有達到(dao)干(gan)燥(zao)效果的(de)(de)濕物(wu)(wu)(wu)(wu)料(liao)(liao)因(yin)自重(zhong)而(er)不(bu)能快速行(xing)(xing)進(jin)(jin)(jin),物(wu)(wu)(wu)(wu)料(liao)(liao)在此(ci)矩(ju)形抄(chao)板內(nei)進(jin)(jin)(jin)行(xing)(xing)充分干(gan)燥(zao),由此(ci)達到(dao)干(gan)燥(zao)效果,完(wan)成干(gan)燥(zao)過程。
設備(bei)特(te)點(dian)
該設備(bei)與其(qi)他干燥(zao)設備(bei)相(xiang)比,生產能力大(da),可連續操作; 結構簡單(dan),操作方便;故障少,維修費用低;適(shi)用范圍廣,流體阻力小(xiao),可以用它干燥(zao)顆料(liao)狀物料(liao),對于那(nei)些附(fu)著性大(da)的物料(liao)也很有利(li);操作彈(dan)性大(da),生產上允許產品的流量(liang)有較大(da)波動(dong)范圍,不會影響產品的質量(liang);清掃容易。