密相氣力輸(shu)送系(xi)列

氣力(li)輸送原理

氣力(li)輸(shu)(shu)送(song)(song)(song)(song)(song)系(xi)統可(ke)(ke)分(fen)(fen)(fen)類(lei)為(wei)(wei)不同的(de)(de)(de)流(liu)(liu)動型式(shi)，其中兩(liang)種主要型式(shi)是(shi)：(a) 稀相(xiang)(xiang)(xiang)(xiang)輸(shu)(shu)送(song)(song)(song)(song)(song)和(he)（b）密(mi)(mi)相(xiang)(xiang)(xiang)(xiang)輸(shu)(shu)送(song)(song)(song)(song)(song)每(mei)種流(liu)(liu)動型式(shi)可(ke)(ke)按(an)物料(liao)與空氣的(de)(de)(de)流(liu)(liu)量比率大小(xiao)分(fen)(fen)(fen)類(lei)，其比率也(ye)(ye)被(bei)(bei)稱為(wei)(wei)“固氣比”： μ=ms/mf (1)許(xu)(xu)多稀相(xiang)(xiang)(xiang)(xiang)的(de)(de)(de)運行范圍為(wei)(wei)0＜μ＜15，而(er)密(mi)(mi)相(xiang)(xiang)(xiang)(xiang)通常是(shi)μ＞15。圖(tu)1所示(shi)的(de)(de)(de)是(shi)典型輸(shu)(shu)送(song)(song)(song)(song)(song)狀態圖(tu)。稀相(xiang)(xiang)(xiang)(xiang)輸(shu)(shu)送(song)(song)(song)(song)(song)可(ke)(ke)以(yi)被(bei)(bei)認(ren)(ren)為(wei)(wei)是(shi)一種完全的(de)(de)(de)懸(xuan)(xuan)浮(fu)流(liu)(liu)，而(er)密(mi)(mi)相(xiang)(xiang)(xiang)(xiang)輸(shu)(shu)送(song)(song)(song)(song)(song)通常被(bei)(bei)認(ren)(ren)為(wei)(wei)是(shi)非懸(xuan)(xuan)浮(fu)流(liu)(liu)。然(ran)而(er)，如圖(tu)1所示(shi)，許(xu)(xu)多不同種類(lei)的(de)(de)(de)密(mi)(mi)相(xiang)(xiang)(xiang)(xiang)（非懸(xuan)(xuan)浮(fu)流(liu)(liu)）依靠散(san)料(liao)的(de)(de)(de)料(liao)性和(he)流(liu)(liu)動性存在。密(mi)(mi)相(xiang)(xiang)(xiang)(xiang)輸(shu)(shu)送(song)(song)(song)(song)(song)同樣也(ye)(ye)能被(bei)(bei)定義為(wei)(wei)輸(shu)(shu)送(song)(song)(song)(song)(song)物料(liao)完全填滿管(guan)道(dao)截(jie)(jie)面的(de)(de)(de)一種輸(shu)(shu)送(song)(song)(song)(song)(song)方(fang)式(shi)。稀相(xiang)(xiang)(xiang)(xiang)輸(shu)(shu)送(song)(song)(song)(song)(song)通常需要使用大量的(de)(de)(de)高速(su)(su)氣體。氣流(liu)(liu)依靠升力(li)和(he)推(tui)動力(li)以(yi)離散(san)粒子的(de)(de)(de)形(xing)式(shi)攜帶(dai)著物料(liao)。參考(kao)圖(tu)1中所述的(de)(de)(de)“懸(xuan)(xuan)浮(fu)流(liu)(liu)”，稀相(xiang)(xiang)(xiang)(xiang)系(xi)統通常是(shi)最為(wei)(wei)被(bei)(bei)廣泛(fan)應用的(de)(de)(de)氣力(li)輸(shu)(shu)送(song)(song)(song)(song)(song)系(xi)統。由(you)于稀相(xiang)(xiang)(xiang)(xiang)系(xi)統設計(ji)的(de)(de)(de)相(xiang)(xiang)(xiang)(xiang)對簡單性，它(ta)們同時(shi)也(ye)(ye)被(bei)(bei)頻繁的(de)(de)(de)應用在工業(ye)領域。輸(shu)(shu)送(song)(song)(song)(song)(song)氣體的(de)(de)(de)速(su)(su)度(du)減少到比保(bao)持粒子懸(xuan)(xuan)浮(fu)狀態的(de)(de)(de)臨界值更小(xiao)時(shi)，導致(zhi)物料(liao)在輸(shu)(shu)送(song)(song)(song)(song)(song)管(guan)道(dao)的(de)(de)(de)橫(heng)截(jie)(jie)面形(xing)成不均勻的(de)(de)(de)分(fen)(fen)(fen)布。臨界氣體速(su)(su)度(du)被(bei)(bei)稱為(wei)(wei)是(shi)水平輸(shu)(shu)送(song)(song)(song)(song)(song)的(de)(de)(de)跳躍速(su)(su)度(du)，垂直輸(shu)(shu)送(song)(song)(song)(song)(song)時(shi)堵塞。當水平管(guan)道(dao)中的(de)(de)(de)物料(liao)表面氣體速(su)(su)度(du)低(di)于突(tu)變速(su)(su)度(du)時(shi)，輸(shu)(shu)送(song)(song)(song)(song)(song)將會以(yi)低(di)流(liu)(liu)量通過管(guan)道(dao)橫(heng)截(jie)(jie)面的(de)(de)(de)上部(bu)，在管(guan)道(dao)的(de)(de)(de)剩(sheng)余部(bu)分(fen)(fen)(fen)以(yi)高濃度(du)低(di)速(su)(su)度(du)的(de)(de)(de)形(xing)式(shi)填充。有(you)時(shi)沿管(guan)道(dao)的(de)(de)(de)橫(heng)截(jie)(jie)面會被(bei)(bei)填滿，而(er)有(you)時(shi)只是(shi)部(bu)分(fen)(fen)(fen)被(bei)(bei)填滿.

實(shi)際應用(yong)中, 按照(zhao)氣(qi)力驅動形式可以(yi)分(fen)(fen)為負(fu)壓(ya)和(he)正壓(ya)氣(qi)力輸送(song)(song), 在(zai)這兩種輸送(song)(song)系(xi)統中, 根(gen)據流(liu)(liu)動狀態圖再區(qu)分(fen)(fen)分(fen)(fen)為稀相(xiang), 密相(xiang)和(he)流(liu)(liu)化(hua)態輸送(song)(song)系(xi)統. 除(chu)此之(zhi)外(wai),根(gen)據喂料不同分(fen)(fen)為連續(xu)和(he)批(pi)次(ci)輸送(song)(song). 在(zai)高(gao)壓(ya)密相(xiang)輸送(song)(song)技術(shu)中常采用(yong)批(pi)次(ci)的壓(ya)力罐進行高(gao)壓(ya)輸送(song)(song), 同時(shi), 可以(yi)組合(he)兩個(ge)壓(ya)力罐設計達到連續(xu)的輸送(song)(song).

密相氣力輸(shu)送特(te)點:

● 用氣量小, 節能

● 無殘留輸送

● 不堵塞, 運(yun)行可(ke)靠

● 維護費用低

● 適合(he)于各類粉粒物料

● 壓力(li)至0. 6m p a可調

● 適合于柔(rou)性化自動生產(chan)中的物料高(gao)效(xiao)輸送(song)