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(ta)是燃(ran)燒煤(mei)的發電(dian)廠(chang)將煤(mei)磨成(cheng)(cheng)(cheng)100微米(mi)以(yi)下的煤(mei)粉,用預熱空氣(qi)噴入爐膛經(jing)燃(ran)燒形成(cheng)(cheng)(cheng)懸(xuan)浮(fu)狀態(tai),產(chan)生混(hun)雜(za)有大量不燃(ran)物的高溫煙氣(qi),經(jing)集塵裝(zhuang)置(zhi)捕集就得到(dao)了粉煤(mei)灰。粉煤(mei)灰的化(hua)學組成(cheng)(cheng)(cheng)與粘(zhan)土質相(xiang)似,主要成(cheng)(cheng)(cheng)分為二氧化(hua)硅、三氧化(hua)二鋁(lv)、三氧化(hua)二鐵、氧化(hua)鈣(gai)和未燃(ran)盡碳。
工(gong)作原理
濕(shi)粉煤灰由供料(liao)(liao)(liao)(liao)裝置進(jin)入(ru)三(san)層(ceng)(ceng)滾筒的(de)(de)(de)內(nei)層(ceng)(ceng),實(shi)現(xian)順(shun)流烘干(gan)(gan), 粉煤灰在內(nei)層(ceng)(ceng)的(de)(de)(de)抄板(ban)下不斷(duan)(duan)抄起、散落呈螺旋行(xing)(xing)(xing)進(jin)式(shi)實(shi)現(xian)熱(re)(re)交(jiao)換,物(wu)(wu)(wu)料(liao)(liao)(liao)(liao)移(yi)動至內(nei)層(ceng)(ceng)的(de)(de)(de)另一端(duan)(duan)進(jin)入(ru)中(zhong)層(ceng)(ceng),進(jin)行(xing)(xing)(xing)逆流烘干(gan)(gan),物(wu)(wu)(wu)料(liao)(liao)(liao)(liao)在中(zhong)層(ceng)(ceng)不斷(duan)(duan)地被反復揚進(jin),呈進(jin)兩步(bu)(bu)退一步(bu)(bu)的(de)(de)(de)行(xing)(xing)(xing)進(jin)方式(shi),物(wu)(wu)(wu)料(liao)(liao)(liao)(liao)在中(zhong)層(ceng)(ceng)既充(chong)分吸(xi)收(shou)內(nei)層(ceng)(ceng)滾筒散發(fa)的(de)(de)(de)熱(re)(re)量(liang),又吸(xi)收(shou)中(zhong)層(ceng)(ceng)滾筒的(de)(de)(de)熱(re)(re)量(liang),同時又延長(chang)了干(gan)(gan)燥(zao)(zao)時間,物(wu)(wu)(wu)料(liao)(liao)(liao)(liao)在此(ci)達(da)到(dao)干(gan)(gan)燥(zao)(zao)狀態。物(wu)(wu)(wu)料(liao)(liao)(liao)(liao)行(xing)(xing)(xing)至中(zhong)層(ceng)(ceng)另一端(duan)(duan)而(er)落入(ru)外(wai)層(ceng)(ceng),物(wu)(wu)(wu)料(liao)(liao)(liao)(liao)在外(wai)層(ceng)(ceng)滾筒內(nei)呈矩形(xing)多回(hui)路方式(shi)行(xing)(xing)(xing)進(jin),達(da)到(dao)干(gan)(gan)燥(zao)(zao)效(xiao)果(guo)的(de)(de)(de)物(wu)(wu)(wu)料(liao)(liao)(liao)(liao)在熱(re)(re)風作用(yong)下快速行(xing)(xing)(xing)進(jin)排(pai)出滾筒,沒有達(da)到(dao)干(gan)(gan)燥(zao)(zao)效(xiao)果(guo)的(de)(de)(de)濕(shi)物(wu)(wu)(wu)料(liao)(liao)(liao)(liao)因自重(zhong)而(er)不能快速行(xing)(xing)(xing)進(jin),物(wu)(wu)(wu)料(liao)(liao)(liao)(liao)在此(ci)矩形(xing)抄板(ban)內(nei)進(jin)行(xing)(xing)(xing)充(chong)分干(gan)(gan)燥(zao)(zao),由此(ci)達(da)到(dao)干(gan)(gan)燥(zao)(zao)效(xiao)果(guo),完成干(gan)(gan)燥(zao)(zao)過程。
設備特點(dian)
該設備(bei)與(yu)其(qi)他干燥(zao)設備(bei)相比,生(sheng)產(chan)能力大,可(ke)連續操作(zuo); 結(jie)構簡單,操作(zuo)方便(bian);故障少,維修費用(yong)低;適用(yong)范(fan)圍廣,流體阻力小,可(ke)以用(yong)它干燥(zao)顆料狀物(wu)料,對于那些附著(zhu)性(xing)大的(de)物(wu)料也很(hen)有利;操作(zuo)彈(dan)性(xing)大,生(sheng)產(chan)上允許(xu)產(chan)品(pin)的(de)流量(liang)有較(jiao)大波動范(fan)圍,不會影響產(chan)品(pin)的(de)質量(liang);清(qing)掃(sao)容易。