密(mi)相(xiang)氣(qi)力輸送(song)系(xi)列

氣(qi)力輸送原理

氣(qi)力(li)(li)(li)輸(shu)(shu)(shu)送(song)(song)(song)(song)(song)系(xi)統可(ke)分(fen)類(lei)(lei)為(wei)(wei)(wei)不(bu)(bu)同的(de)(de)(de)流(liu)動(dong)型(xing)(xing)式，其中兩種(zhong)(zhong)(zhong)主要(yao)(yao)型(xing)(xing)式是(shi)：(a) 稀(xi)(xi)相輸(shu)(shu)(shu)送(song)(song)(song)(song)(song)和(he)（b）密相輸(shu)(shu)(shu)送(song)(song)(song)(song)(song)每種(zhong)(zhong)(zhong)流(liu)動(dong)型(xing)(xing)式可(ke)按物(wu)(wu)料與(yu)空氣(qi)的(de)(de)(de)流(liu)量(liang)比(bi)(bi)(bi)(bi)率大小分(fen)類(lei)(lei)，其比(bi)(bi)(bi)(bi)率也被(bei)(bei)稱(cheng)為(wei)(wei)(wei)“固氣(qi)比(bi)(bi)(bi)(bi)”： μ=ms/mf (1)許多(duo)稀(xi)(xi)相的(de)(de)(de)運行范(fan)圍為(wei)(wei)(wei)0＜μ＜15，而(er)密相通常是(shi)μ＞15。圖(tu)1所示的(de)(de)(de)是(shi)典型(xing)(xing)輸(shu)(shu)(shu)送(song)(song)(song)(song)(song)狀態圖(tu)。稀(xi)(xi)相輸(shu)(shu)(shu)送(song)(song)(song)(song)(song)可(ke)以被(bei)(bei)認(ren)為(wei)(wei)(wei)是(shi)一種(zhong)(zhong)(zhong)完全的(de)(de)(de)懸浮流(liu)，而(er)密相輸(shu)(shu)(shu)送(song)(song)(song)(song)(song)通常被(bei)(bei)認(ren)為(wei)(wei)(wei)是(shi)非(fei)懸浮流(liu)。然而(er)，如圖(tu)1所示，許多(duo)不(bu)(bu)同種(zhong)(zhong)(zhong)類(lei)(lei)的(de)(de)(de)密相（非(fei)懸浮流(liu)）依靠散料的(de)(de)(de)料性(xing)(xing)和(he)流(liu)動(dong)性(xing)(xing)存在。密相輸(shu)(shu)(shu)送(song)(song)(song)(song)(song)同樣也能被(bei)(bei)定義為(wei)(wei)(wei)輸(shu)(shu)(shu)送(song)(song)(song)(song)(song)物(wu)(wu)料完全填(tian)(tian)滿(man)管道截(jie)面(mian)(mian)的(de)(de)(de)一種(zhong)(zhong)(zhong)輸(shu)(shu)(shu)送(song)(song)(song)(song)(song)方(fang)式。稀(xi)(xi)相輸(shu)(shu)(shu)送(song)(song)(song)(song)(song)通常需要(yao)(yao)使(shi)用大量(liang)的(de)(de)(de)高速(su)氣(qi)體(ti)。氣(qi)流(liu)依靠升力(li)(li)(li)和(he)推動(dong)力(li)(li)(li)以離散粒子的(de)(de)(de)形(xing)式攜帶(dai)著物(wu)(wu)料。參(can)考圖(tu)1中所述(shu)的(de)(de)(de)“懸浮流(liu)”，稀(xi)(xi)相系(xi)統通常是(shi)最為(wei)(wei)(wei)被(bei)(bei)廣泛應用的(de)(de)(de)氣(qi)力(li)(li)(li)輸(shu)(shu)(shu)送(song)(song)(song)(song)(song)系(xi)統。由(you)于稀(xi)(xi)相系(xi)統設計的(de)(de)(de)相對簡(jian)單(dan)性(xing)(xing)，它(ta)們(men)同時(shi)(shi)也被(bei)(bei)頻繁(fan)的(de)(de)(de)應用在工(gong)業(ye)領域。輸(shu)(shu)(shu)送(song)(song)(song)(song)(song)氣(qi)體(ti)的(de)(de)(de)速(su)度減少到(dao)比(bi)(bi)(bi)(bi)保持粒子懸浮狀態的(de)(de)(de)臨(lin)界值更小時(shi)(shi)，導致物(wu)(wu)料在輸(shu)(shu)(shu)送(song)(song)(song)(song)(song)管道的(de)(de)(de)橫截(jie)面(mian)(mian)形(xing)成不(bu)(bu)均勻的(de)(de)(de)分(fen)布。臨(lin)界氣(qi)體(ti)速(su)度被(bei)(bei)稱(cheng)為(wei)(wei)(wei)是(shi)水(shui)(shui)平(ping)輸(shu)(shu)(shu)送(song)(song)(song)(song)(song)的(de)(de)(de)跳(tiao)躍速(su)度，垂(chui)直輸(shu)(shu)(shu)送(song)(song)(song)(song)(song)時(shi)(shi)堵塞。當水(shui)(shui)平(ping)管道中的(de)(de)(de)物(wu)(wu)料表面(mian)(mian)氣(qi)體(ti)速(su)度低于突變速(su)度時(shi)(shi)，輸(shu)(shu)(shu)送(song)(song)(song)(song)(song)將會(hui)以低流(liu)量(liang)通過管道橫截(jie)面(mian)(mian)的(de)(de)(de)上部(bu)，在管道的(de)(de)(de)剩余部(bu)分(fen)以高濃度低速(su)度的(de)(de)(de)形(xing)式填(tian)(tian)充。有時(shi)(shi)沿管道的(de)(de)(de)橫截(jie)面(mian)(mian)會(hui)被(bei)(bei)填(tian)(tian)滿(man)，而(er)有時(shi)(shi)只是(shi)部(bu)分(fen)被(bei)(bei)填(tian)(tian)滿(man).

實際應用(yong)中(zhong), 按照氣力(li)驅(qu)動形(xing)式可(ke)(ke)以(yi)分(fen)(fen)為(wei)負(fu)壓(ya)(ya)和正壓(ya)(ya)氣力(li)輸(shu)(shu)送(song), 在這兩種輸(shu)(shu)送(song)系統中(zhong), 根據(ju)流動狀態圖再區分(fen)(fen)分(fen)(fen)為(wei)稀相(xiang)(xiang), 密相(xiang)(xiang)和流化態輸(shu)(shu)送(song)系統. 除此之(zhi)外,根據(ju)喂料不同分(fen)(fen)為(wei)連(lian)(lian)續和批(pi)次(ci)輸(shu)(shu)送(song). 在高壓(ya)(ya)密相(xiang)(xiang)輸(shu)(shu)送(song)技術中(zhong)常采用(yong)批(pi)次(ci)的壓(ya)(ya)力(li)罐進行高壓(ya)(ya)輸(shu)(shu)送(song), 同時, 可(ke)(ke)以(yi)組合兩個壓(ya)(ya)力(li)罐設計(ji)達到連(lian)(lian)續的輸(shu)(shu)送(song).

密相氣力輸送特點:

● 用氣(qi)量小, 節能

● 無殘留輸送

● 不堵塞, 運行可靠(kao)

● 維護費用低

● 適合于各類粉粒物(wu)料(liao)

● 壓力至0. 6m p a可調

● 適合于柔(rou)性化自動生產(chan)中的物料高效輸(shu)送