密相氣力輸送(song)系(xi)列

氣力(li)輸送原(yuan)理

氣力(li)輸(shu)送(song)(song)(song)(song)(song)系(xi)統(tong)(tong)可分類(lei)為不(bu)同的(de)(de)(de)(de)(de)(de)(de)流(liu)動(dong)型(xing)式(shi)(shi)，其(qi)中(zhong)兩(liang)種(zhong)主要型(xing)式(shi)(shi)是(shi)：(a) 稀(xi)相(xiang)(xiang)(xiang)(xiang)輸(shu)送(song)(song)(song)(song)(song)和（b）密(mi)相(xiang)(xiang)(xiang)(xiang)輸(shu)送(song)(song)(song)(song)(song)每(mei)種(zhong)流(liu)動(dong)型(xing)式(shi)(shi)可按物(wu)(wu)(wu)料與空氣的(de)(de)(de)(de)(de)(de)(de)流(liu)量(liang)比(bi)(bi)率大小(xiao)分類(lei)，其(qi)比(bi)(bi)率也(ye)被(bei)稱為“固氣比(bi)(bi)”： μ=ms/mf (1)許多(duo)稀(xi)相(xiang)(xiang)(xiang)(xiang)的(de)(de)(de)(de)(de)(de)(de)運行范(fan)圍為0＜μ＜15，而密(mi)相(xiang)(xiang)(xiang)(xiang)通(tong)(tong)常(chang)是(shi)μ＞15。圖1所(suo)示(shi)(shi)的(de)(de)(de)(de)(de)(de)(de)是(shi)典型(xing)輸(shu)送(song)(song)(song)(song)(song)狀態(tai)圖。稀(xi)相(xiang)(xiang)(xiang)(xiang)輸(shu)送(song)(song)(song)(song)(song)可以被(bei)認為是(shi)一種(zhong)完全的(de)(de)(de)(de)(de)(de)(de)懸浮流(liu)，而密(mi)相(xiang)(xiang)(xiang)(xiang)輸(shu)送(song)(song)(song)(song)(song)通(tong)(tong)常(chang)被(bei)認為是(shi)非懸浮流(liu)。然而，如圖1所(suo)示(shi)(shi)，許多(duo)不(bu)同種(zhong)類(lei)的(de)(de)(de)(de)(de)(de)(de)密(mi)相(xiang)(xiang)(xiang)(xiang)（非懸浮流(liu)）依靠(kao)散(san)料的(de)(de)(de)(de)(de)(de)(de)料性和流(liu)動(dong)性存在(zai)(zai)。密(mi)相(xiang)(xiang)(xiang)(xiang)輸(shu)送(song)(song)(song)(song)(song)同樣(yang)也(ye)能被(bei)定義為輸(shu)送(song)(song)(song)(song)(song)物(wu)(wu)(wu)料完全填(tian)滿(man)管(guan)(guan)(guan)道截(jie)面(mian)的(de)(de)(de)(de)(de)(de)(de)一種(zhong)輸(shu)送(song)(song)(song)(song)(song)方式(shi)(shi)。稀(xi)相(xiang)(xiang)(xiang)(xiang)輸(shu)送(song)(song)(song)(song)(song)通(tong)(tong)常(chang)需要使用大量(liang)的(de)(de)(de)(de)(de)(de)(de)高(gao)速氣體(ti)。氣流(liu)依靠(kao)升力(li)和推動(dong)力(li)以離散(san)粒(li)子的(de)(de)(de)(de)(de)(de)(de)形式(shi)(shi)攜帶(dai)著物(wu)(wu)(wu)料。參考圖1中(zhong)所(suo)述(shu)的(de)(de)(de)(de)(de)(de)(de)“懸浮流(liu)”，稀(xi)相(xiang)(xiang)(xiang)(xiang)系(xi)統(tong)(tong)通(tong)(tong)常(chang)是(shi)最為被(bei)廣泛應(ying)用的(de)(de)(de)(de)(de)(de)(de)氣力(li)輸(shu)送(song)(song)(song)(song)(song)系(xi)統(tong)(tong)。由(you)于稀(xi)相(xiang)(xiang)(xiang)(xiang)系(xi)統(tong)(tong)設計的(de)(de)(de)(de)(de)(de)(de)相(xiang)(xiang)(xiang)(xiang)對簡單性，它們同時(shi)也(ye)被(bei)頻繁的(de)(de)(de)(de)(de)(de)(de)應(ying)用在(zai)(zai)工(gong)業(ye)領域。輸(shu)送(song)(song)(song)(song)(song)氣體(ti)的(de)(de)(de)(de)(de)(de)(de)速度(du)(du)減少到比(bi)(bi)保持粒(li)子懸浮狀態(tai)的(de)(de)(de)(de)(de)(de)(de)臨(lin)界(jie)值更小(xiao)時(shi)，導致物(wu)(wu)(wu)料在(zai)(zai)輸(shu)送(song)(song)(song)(song)(song)管(guan)(guan)(guan)道的(de)(de)(de)(de)(de)(de)(de)橫(heng)截(jie)面(mian)形成(cheng)不(bu)均(jun)勻的(de)(de)(de)(de)(de)(de)(de)分布。臨(lin)界(jie)氣體(ti)速度(du)(du)被(bei)稱為是(shi)水(shui)平(ping)輸(shu)送(song)(song)(song)(song)(song)的(de)(de)(de)(de)(de)(de)(de)跳躍速度(du)(du)，垂直輸(shu)送(song)(song)(song)(song)(song)時(shi)堵塞。當水(shui)平(ping)管(guan)(guan)(guan)道中(zhong)的(de)(de)(de)(de)(de)(de)(de)物(wu)(wu)(wu)料表面(mian)氣體(ti)速度(du)(du)低于突變(bian)速度(du)(du)時(shi)，輸(shu)送(song)(song)(song)(song)(song)將會以低流(liu)量(liang)通(tong)(tong)過管(guan)(guan)(guan)道橫(heng)截(jie)面(mian)的(de)(de)(de)(de)(de)(de)(de)上(shang)部(bu)，在(zai)(zai)管(guan)(guan)(guan)道的(de)(de)(de)(de)(de)(de)(de)剩余部(bu)分以高(gao)濃度(du)(du)低速度(du)(du)的(de)(de)(de)(de)(de)(de)(de)形式(shi)(shi)填(tian)充。有時(shi)沿(yan)管(guan)(guan)(guan)道的(de)(de)(de)(de)(de)(de)(de)橫(heng)截(jie)面(mian)會被(bei)填(tian)滿(man)，而有時(shi)只是(shi)部(bu)分被(bei)填(tian)滿(man).

實際應用中(zhong), 按照(zhao)氣力(li)驅(qu)動形式可(ke)以分(fen)(fen)為(wei)負(fu)壓和正壓氣力(li)輸送(song)(song), 在這兩種(zhong)輸送(song)(song)系(xi)(xi)統中(zhong), 根(gen)據流動狀態圖再區分(fen)(fen)分(fen)(fen)為(wei)稀(xi)相(xiang), 密相(xiang)和流化態輸送(song)(song)系(xi)(xi)統. 除(chu)此之外,根(gen)據喂料不同分(fen)(fen)為(wei)連續和批(pi)次(ci)輸送(song)(song). 在高壓密相(xiang)輸送(song)(song)技術中(zhong)常采用批(pi)次(ci)的(de)壓力(li)罐(guan)進(jin)行高壓輸送(song)(song), 同時, 可(ke)以組合兩個壓力(li)罐(guan)設計達到連續的(de)輸送(song)(song).

密(mi)相氣力輸送特點(dian):

● 用氣量小, 節能

● 無殘留(liu)輸送

● 不(bu)堵塞, 運(yun)行(xing)可靠

● 維護費用低

● 適合于各類粉粒物料

● 壓(ya)力至0. 6m p a可調

● 適合于(yu)柔(rou)性化自動生產中的物(wu)料(liao)高效輸(shu)送