密相(xiang)氣力(li)輸送系列

氣力輸送原理

氣力(li)輸(shu)(shu)(shu)(shu)送(song)(song)系(xi)統(tong)可分(fen)類為(wei)(wei)不(bu)(bu)同(tong)的(de)(de)(de)流(liu)動型式(shi)，其中兩種(zhong)主要型式(shi)是(shi)(shi)(shi)：(a) 稀(xi)(xi)相輸(shu)(shu)(shu)(shu)送(song)(song)和（b）密(mi)(mi)(mi)相輸(shu)(shu)(shu)(shu)送(song)(song)每種(zhong)流(liu)動型式(shi)可按物料與空(kong)氣的(de)(de)(de)流(liu)量(liang)比率大(da)小分(fen)類，其比率也(ye)被(bei)稱(cheng)為(wei)(wei)“固氣比”： μ=ms/mf (1)許(xu)多稀(xi)(xi)相的(de)(de)(de)運行范圍(wei)為(wei)(wei)0＜μ＜15，而(er)密(mi)(mi)(mi)相通(tong)(tong)常是(shi)(shi)(shi)μ＞15。圖(tu)1所(suo)(suo)示(shi)的(de)(de)(de)是(shi)(shi)(shi)典型輸(shu)(shu)(shu)(shu)送(song)(song)狀態圖(tu)。稀(xi)(xi)相輸(shu)(shu)(shu)(shu)送(song)(song)可以(yi)被(bei)認為(wei)(wei)是(shi)(shi)(shi)一(yi)種(zhong)完(wan)全的(de)(de)(de)懸(xuan)浮(fu)(fu)流(liu)，而(er)密(mi)(mi)(mi)相輸(shu)(shu)(shu)(shu)送(song)(song)通(tong)(tong)常被(bei)認為(wei)(wei)是(shi)(shi)(shi)非懸(xuan)浮(fu)(fu)流(liu)。然而(er)，如圖(tu)1所(suo)(suo)示(shi)，許(xu)多不(bu)(bu)同(tong)種(zhong)類的(de)(de)(de)密(mi)(mi)(mi)相（非懸(xuan)浮(fu)(fu)流(liu)）依靠(kao)(kao)散料的(de)(de)(de)料性和流(liu)動性存在(zai)(zai)。密(mi)(mi)(mi)相輸(shu)(shu)(shu)(shu)送(song)(song)同(tong)樣也(ye)能被(bei)定義為(wei)(wei)輸(shu)(shu)(shu)(shu)送(song)(song)物料完(wan)全填(tian)滿(man)管(guan)(guan)道(dao)截面(mian)的(de)(de)(de)一(yi)種(zhong)輸(shu)(shu)(shu)(shu)送(song)(song)方式(shi)。稀(xi)(xi)相輸(shu)(shu)(shu)(shu)送(song)(song)通(tong)(tong)常需要使用大(da)量(liang)的(de)(de)(de)高(gao)速(su)(su)(su)(su)氣體(ti)。氣流(liu)依靠(kao)(kao)升力(li)和推動力(li)以(yi)離(li)散粒子的(de)(de)(de)形(xing)式(shi)攜帶(dai)著物料。參考圖(tu)1中所(suo)(suo)述(shu)的(de)(de)(de)“懸(xuan)浮(fu)(fu)流(liu)”，稀(xi)(xi)相系(xi)統(tong)通(tong)(tong)常是(shi)(shi)(shi)最為(wei)(wei)被(bei)廣(guang)泛應用的(de)(de)(de)氣力(li)輸(shu)(shu)(shu)(shu)送(song)(song)系(xi)統(tong)。由于(yu)稀(xi)(xi)相系(xi)統(tong)設計的(de)(de)(de)相對簡(jian)單性，它(ta)們同(tong)時(shi)也(ye)被(bei)頻繁的(de)(de)(de)應用在(zai)(zai)工業領域。輸(shu)(shu)(shu)(shu)送(song)(song)氣體(ti)的(de)(de)(de)速(su)(su)(su)(su)度(du)減少到比保持(chi)粒子懸(xuan)浮(fu)(fu)狀態的(de)(de)(de)臨界(jie)值更小時(shi)，導致物料在(zai)(zai)輸(shu)(shu)(shu)(shu)送(song)(song)管(guan)(guan)道(dao)的(de)(de)(de)橫截面(mian)形(xing)成不(bu)(bu)均勻(yun)的(de)(de)(de)分(fen)布。臨界(jie)氣體(ti)速(su)(su)(su)(su)度(du)被(bei)稱(cheng)為(wei)(wei)是(shi)(shi)(shi)水平輸(shu)(shu)(shu)(shu)送(song)(song)的(de)(de)(de)跳躍速(su)(su)(su)(su)度(du)，垂直輸(shu)(shu)(shu)(shu)送(song)(song)時(shi)堵塞。當水平管(guan)(guan)道(dao)中的(de)(de)(de)物料表面(mian)氣體(ti)速(su)(su)(su)(su)度(du)低(di)于(yu)突變速(su)(su)(su)(su)度(du)時(shi)，輸(shu)(shu)(shu)(shu)送(song)(song)將(jiang)會(hui)以(yi)低(di)流(liu)量(liang)通(tong)(tong)過管(guan)(guan)道(dao)橫截面(mian)的(de)(de)(de)上部，在(zai)(zai)管(guan)(guan)道(dao)的(de)(de)(de)剩余部分(fen)以(yi)高(gao)濃(nong)度(du)低(di)速(su)(su)(su)(su)度(du)的(de)(de)(de)形(xing)式(shi)填(tian)充。有(you)時(shi)沿管(guan)(guan)道(dao)的(de)(de)(de)橫截面(mian)會(hui)被(bei)填(tian)滿(man)，而(er)有(you)時(shi)只是(shi)(shi)(shi)部分(fen)被(bei)填(tian)滿(man).

實際應用(yong)中, 按照氣力驅(qu)動形式可以(yi)分為(wei)(wei)負壓(ya)(ya)和正壓(ya)(ya)氣力輸(shu)(shu)送(song)(song), 在這兩種輸(shu)(shu)送(song)(song)系統中, 根據流動狀態(tai)圖再區分分為(wei)(wei)稀相, 密相和流化態(tai)輸(shu)(shu)送(song)(song)系統. 除此之外(wai),根據喂料不同分為(wei)(wei)連續和批次輸(shu)(shu)送(song)(song). 在高(gao)壓(ya)(ya)密相輸(shu)(shu)送(song)(song)技術(shu)中常采用(yong)批次的壓(ya)(ya)力罐進行高(gao)壓(ya)(ya)輸(shu)(shu)送(song)(song), 同時, 可以(yi)組合(he)兩個壓(ya)(ya)力罐設計達到連續的輸(shu)(shu)送(song)(song).

密相氣力輸送特點:

● 用氣量小(xiao), 節能

● 無殘留輸送

● 不堵塞(sai), 運行可靠(kao)

● 維護費用低

● 適合于各類(lei)粉粒物料

● 壓力至0. 6m p a可調(diao)

● 適合(he)于(yu)柔(rou)性化自動生(sheng)產中的物料高效(xiao)輸送