煤(mei)粉灰烘干(gan)機(ji)是煤(mei)粉經(jing)高(gao)溫燃燒后(hou)形成的(de)一種似火山灰質混合材料。
它(ta)是燃燒煤(mei)(mei)的(de)發電廠將煤(mei)(mei)磨成100微(wei)米以(yi)下的(de)煤(mei)(mei)粉,用預熱空氣噴入爐膛經燃燒形成懸浮狀(zhuang)態(tai),產生混雜有大量(liang)不燃物(wu)的(de)高溫煙氣,經集(ji)(ji)塵(chen)裝置捕集(ji)(ji)就得到了(le)粉煤(mei)(mei)灰。粉煤(mei)(mei)灰的(de)化學組成與粘土質(zhi)相(xiang)似,主(zhu)要成分為二氧(yang)化硅、三(san)氧(yang)化二鋁、三(san)氧(yang)化二鐵、氧(yang)化鈣和未燃盡(jin)碳。
工作原理
濕(shi)粉煤灰由供(gong)料裝(zhuang)置進(jin)(jin)(jin)(jin)(jin)(jin)入三層(ceng)滾筒的內(nei)層(ceng),實現(xian)順流烘(hong)(hong)干(gan)(gan)(gan), 粉煤灰在(zai)內(nei)層(ceng)的抄(chao)板(ban)下(xia)不斷抄(chao)起、散(san)落呈螺旋行(xing)(xing)進(jin)(jin)(jin)(jin)(jin)(jin)式(shi)(shi)實現(xian)熱(re)交(jiao)換,物(wu)(wu)(wu)料移動至內(nei)層(ceng)的另一端進(jin)(jin)(jin)(jin)(jin)(jin)入中(zhong)層(ceng),進(jin)(jin)(jin)(jin)(jin)(jin)行(xing)(xing)逆(ni)流烘(hong)(hong)干(gan)(gan)(gan),物(wu)(wu)(wu)料在(zai)中(zhong)層(ceng)不斷地被反復揚進(jin)(jin)(jin)(jin)(jin)(jin),呈進(jin)(jin)(jin)(jin)(jin)(jin)兩(liang)步退一步的行(xing)(xing)進(jin)(jin)(jin)(jin)(jin)(jin)方式(shi)(shi),物(wu)(wu)(wu)料在(zai)中(zhong)層(ceng)既充分(fen)吸收(shou)內(nei)層(ceng)滾筒散(san)發(fa)的熱(re)量,又(you)(you)吸收(shou)中(zhong)層(ceng)滾筒的熱(re)量,同時(shi)又(you)(you)延長了干(gan)(gan)(gan)燥(zao)(zao)(zao)時(shi)間,物(wu)(wu)(wu)料在(zai)此(ci)達(da)到(dao)(dao)干(gan)(gan)(gan)燥(zao)(zao)(zao)狀態。物(wu)(wu)(wu)料行(xing)(xing)至中(zhong)層(ceng)另一端而落入外層(ceng),物(wu)(wu)(wu)料在(zai)外層(ceng)滾筒內(nei)呈矩(ju)形(xing)多(duo)回路方式(shi)(shi)行(xing)(xing)進(jin)(jin)(jin)(jin)(jin)(jin),達(da)到(dao)(dao)干(gan)(gan)(gan)燥(zao)(zao)(zao)效(xiao)果(guo)的物(wu)(wu)(wu)料在(zai)熱(re)風作用下(xia)快速行(xing)(xing)進(jin)(jin)(jin)(jin)(jin)(jin)排出滾筒,沒有達(da)到(dao)(dao)干(gan)(gan)(gan)燥(zao)(zao)(zao)效(xiao)果(guo)的濕(shi)物(wu)(wu)(wu)料因自重而不能快速行(xing)(xing)進(jin)(jin)(jin)(jin)(jin)(jin),物(wu)(wu)(wu)料在(zai)此(ci)矩(ju)形(xing)抄(chao)板(ban)內(nei)進(jin)(jin)(jin)(jin)(jin)(jin)行(xing)(xing)充分(fen)干(gan)(gan)(gan)燥(zao)(zao)(zao),由此(ci)達(da)到(dao)(dao)干(gan)(gan)(gan)燥(zao)(zao)(zao)效(xiao)果(guo),完(wan)成干(gan)(gan)(gan)燥(zao)(zao)(zao)過程。
設備特(te)點
該設(she)備(bei)與其他干(gan)燥設(she)備(bei)相比(bi),生產能力大(da),可(ke)連(lian)續操作; 結構(gou)簡(jian)單,操作方(fang)便;故障少,維修費用(yong)(yong)低;適用(yong)(yong)范(fan)圍廣,流(liu)體(ti)阻(zu)力小,可(ke)以用(yong)(yong)它干(gan)燥顆料狀物料,對(dui)于那些附著性(xing)大(da)的(de)物料也很有(you)利;操作彈性(xing)大(da),生產上允許產品的(de)流(liu)量有(you)較(jiao)大(da)波動范(fan)圍,不(bu)會影響產品的(de)質量;清(qing)掃容易。