煤粉(fen)灰烘(hong)干機(ji)是煤粉(fen)經高溫燃燒后形(xing)成的一(yi)種似火山灰質混合材料。
它是燃燒煤(mei)的(de)(de)發電廠(chang)將煤(mei)磨(mo)成(cheng)100微米以下的(de)(de)煤(mei)粉,用(yong)預(yu)熱空氣(qi)噴入爐膛經燃燒形成(cheng)懸浮狀態(tai),產生混(hun)雜有大量不(bu)燃物的(de)(de)高溫(wen)煙氣(qi),經集塵裝置捕集就得到了粉煤(mei)灰。粉煤(mei)灰的(de)(de)化(hua)學組成(cheng)與粘(zhan)土質相似,主要成(cheng)分為二氧化(hua)硅、三(san)氧化(hua)二鋁、三(san)氧化(hua)二鐵、氧化(hua)鈣和(he)未燃盡(jin)碳。
工作原理
濕粉煤灰由供料(liao)(liao)裝置進(jin)(jin)(jin)(jin)入(ru)三層(ceng)(ceng)滾(gun)筒(tong)的(de)(de)內(nei)(nei)層(ceng)(ceng),實(shi)現(xian)順流烘(hong)(hong)干, 粉煤灰在(zai)(zai)內(nei)(nei)層(ceng)(ceng)的(de)(de)抄(chao)板下不(bu)斷抄(chao)起、散落(luo)(luo)呈螺旋(xuan)行(xing)進(jin)(jin)(jin)(jin)式(shi)實(shi)現(xian)熱(re)交換,物(wu)料(liao)(liao)移動至內(nei)(nei)層(ceng)(ceng)的(de)(de)另(ling)一端進(jin)(jin)(jin)(jin)入(ru)中(zhong)層(ceng)(ceng),進(jin)(jin)(jin)(jin)行(xing)逆(ni)流烘(hong)(hong)干,物(wu)料(liao)(liao)在(zai)(zai)中(zhong)層(ceng)(ceng)不(bu)斷地被反復揚進(jin)(jin)(jin)(jin),呈進(jin)(jin)(jin)(jin)兩(liang)步退一步的(de)(de)行(xing)進(jin)(jin)(jin)(jin)方(fang)式(shi),物(wu)料(liao)(liao)在(zai)(zai)中(zhong)層(ceng)(ceng)既充分(fen)吸(xi)收(shou)內(nei)(nei)層(ceng)(ceng)滾(gun)筒(tong)散發的(de)(de)熱(re)量(liang),又吸(xi)收(shou)中(zhong)層(ceng)(ceng)滾(gun)筒(tong)的(de)(de)熱(re)量(liang),同時又延長了干燥(zao)(zao)時間(jian),物(wu)料(liao)(liao)在(zai)(zai)此達到(dao)(dao)干燥(zao)(zao)狀態。物(wu)料(liao)(liao)行(xing)至中(zhong)層(ceng)(ceng)另(ling)一端而落(luo)(luo)入(ru)外層(ceng)(ceng),物(wu)料(liao)(liao)在(zai)(zai)外層(ceng)(ceng)滾(gun)筒(tong)內(nei)(nei)呈矩(ju)(ju)形(xing)多回路方(fang)式(shi)行(xing)進(jin)(jin)(jin)(jin),達到(dao)(dao)干燥(zao)(zao)效果的(de)(de)物(wu)料(liao)(liao)在(zai)(zai)熱(re)風(feng)作用(yong)下快速行(xing)進(jin)(jin)(jin)(jin)排出(chu)滾(gun)筒(tong),沒有達到(dao)(dao)干燥(zao)(zao)效果的(de)(de)濕物(wu)料(liao)(liao)因自重而不(bu)能快速行(xing)進(jin)(jin)(jin)(jin),物(wu)料(liao)(liao)在(zai)(zai)此矩(ju)(ju)形(xing)抄(chao)板內(nei)(nei)進(jin)(jin)(jin)(jin)行(xing)充分(fen)干燥(zao)(zao),由此達到(dao)(dao)干燥(zao)(zao)效果,完成(cheng)干燥(zao)(zao)過(guo)程。
設備特點
該設(she)備與(yu)其(qi)他干燥設(she)備相比,生產(chan)能力(li)大(da),可連續操(cao)作(zuo); 結構(gou)簡(jian)單,操(cao)作(zuo)方便;故(gu)障少,維修費用(yong)低;適用(yong)范圍(wei)廣,流體阻力(li)小,可以(yi)用(yong)它干燥顆料狀物(wu)料,對于(yu)那些附著性大(da)的物(wu)料也很有利;操(cao)作(zuo)彈性大(da),生產(chan)上(shang)允許產(chan)品的流量有較(jiao)大(da)波動(dong)范圍(wei),不會影響產(chan)品的質(zhi)量;清掃容易。