煤粉灰(hui)烘干機是煤粉經高溫燃(ran)燒(shao)后形成(cheng)的一種(zhong)似火山灰(hui)質(zhi)混合(he)材料。
它(ta)是燃燒煤的(de)(de)發電廠將煤磨(mo)成(cheng)100微(wei)米(mi)以(yi)下的(de)(de)煤粉(fen),用預熱空氣噴入爐膛經燃燒形成(cheng)懸浮狀(zhuang)態(tai),產生混雜有大(da)量不(bu)燃物的(de)(de)高溫煙氣,經集塵裝(zhuang)置捕集就得到了粉(fen)煤灰。粉(fen)煤灰的(de)(de)化(hua)(hua)學組成(cheng)與(yu)粘土質相(xiang)似,主要成(cheng)分為二(er)氧(yang)化(hua)(hua)硅、三氧(yang)化(hua)(hua)二(er)鋁、三氧(yang)化(hua)(hua)二(er)鐵、氧(yang)化(hua)(hua)鈣(gai)和未燃盡(jin)碳。
工(gong)作原理
濕粉煤灰由供料(liao)裝置進入三層(ceng)(ceng)(ceng)滾筒(tong)的(de)(de)(de)內(nei)(nei)層(ceng)(ceng)(ceng),實現順(shun)流烘干, 粉煤灰在(zai)內(nei)(nei)層(ceng)(ceng)(ceng)的(de)(de)(de)抄板(ban)下(xia)不(bu)(bu)斷抄起(qi)、散(san)(san)落(luo)呈螺(luo)旋行進式(shi)實現熱(re)交換(huan),物(wu)(wu)料(liao)移(yi)動至(zhi)內(nei)(nei)層(ceng)(ceng)(ceng)的(de)(de)(de)另(ling)一端進入中(zhong)(zhong)(zhong)層(ceng)(ceng)(ceng),進行逆流烘干,物(wu)(wu)料(liao)在(zai)中(zhong)(zhong)(zhong)層(ceng)(ceng)(ceng)不(bu)(bu)斷地被反復揚進,呈進兩步退(tui)一步的(de)(de)(de)行進方(fang)式(shi),物(wu)(wu)料(liao)在(zai)中(zhong)(zhong)(zhong)層(ceng)(ceng)(ceng)既充分吸收(shou)內(nei)(nei)層(ceng)(ceng)(ceng)滾筒(tong)散(san)(san)發(fa)的(de)(de)(de)熱(re)量,又吸收(shou)中(zhong)(zhong)(zhong)層(ceng)(ceng)(ceng)滾筒(tong)的(de)(de)(de)熱(re)量,同時(shi)又延長了干燥(zao)(zao)時(shi)間(jian),物(wu)(wu)料(liao)在(zai)此達(da)到(dao)干燥(zao)(zao)狀態。物(wu)(wu)料(liao)行至(zhi)中(zhong)(zhong)(zhong)層(ceng)(ceng)(ceng)另(ling)一端而落(luo)入外(wai)層(ceng)(ceng)(ceng),物(wu)(wu)料(liao)在(zai)外(wai)層(ceng)(ceng)(ceng)滾筒(tong)內(nei)(nei)呈矩(ju)形多回路方(fang)式(shi)行進,達(da)到(dao)干燥(zao)(zao)效(xiao)果的(de)(de)(de)物(wu)(wu)料(liao)在(zai)熱(re)風(feng)作用下(xia)快速行進排出滾筒(tong),沒有達(da)到(dao)干燥(zao)(zao)效(xiao)果的(de)(de)(de)濕物(wu)(wu)料(liao)因自重(zhong)而不(bu)(bu)能快速行進,物(wu)(wu)料(liao)在(zai)此矩(ju)形抄板(ban)內(nei)(nei)進行充分干燥(zao)(zao),由此達(da)到(dao)干燥(zao)(zao)效(xiao)果,完成干燥(zao)(zao)過程。
設備特點(dian)
該設備(bei)與其他干燥(zao)設備(bei)相比,生產(chan)能力大(da),可連續操作; 結構簡(jian)單,操作方(fang)便(bian);故障(zhang)少,維修費(fei)用(yong)低;適用(yong)范(fan)圍廣,流體阻(zu)力小,可以用(yong)它干燥(zao)顆料(liao)狀物料(liao),對于那些附著性大(da)的(de)物料(liao)也很有利(li);操作彈性大(da),生產(chan)上允許產(chan)品(pin)的(de)流量有較大(da)波動范(fan)圍,不會影(ying)響產(chan)品(pin)的(de)質(zhi)量;清掃容易(yi)。