密相氣(qi)力輸(shu)送(song)系(xi)列(lie)

氣力輸送原理

氣(qi)(qi)力(li)(li)輸(shu)送(song)(song)(song)(song)(song)系統可分(fen)類為(wei)(wei)不同的(de)(de)流(liu)(liu)動型(xing)(xing)(xing)式(shi)(shi)，其中兩種(zhong)(zhong)主要(yao)型(xing)(xing)(xing)式(shi)(shi)是(shi)(shi)(shi)：(a) 稀(xi)(xi)相(xiang)(xiang)輸(shu)送(song)(song)(song)(song)(song)和（b）密(mi)相(xiang)(xiang)輸(shu)送(song)(song)(song)(song)(song)每種(zhong)(zhong)流(liu)(liu)動型(xing)(xing)(xing)式(shi)(shi)可按物料(liao)(liao)(liao)與空(kong)氣(qi)(qi)的(de)(de)流(liu)(liu)量(liang)比率(lv)大小分(fen)類，其比率(lv)也(ye)(ye)被(bei)(bei)稱(cheng)為(wei)(wei)“固氣(qi)(qi)比”： μ=ms/mf (1)許多稀(xi)(xi)相(xiang)(xiang)的(de)(de)運行范圍(wei)為(wei)(wei)0＜μ＜15，而(er)(er)密(mi)相(xiang)(xiang)通(tong)(tong)(tong)常是(shi)(shi)(shi)μ＞15。圖(tu)1所(suo)示(shi)的(de)(de)是(shi)(shi)(shi)典(dian)型(xing)(xing)(xing)輸(shu)送(song)(song)(song)(song)(song)狀(zhuang)態圖(tu)。稀(xi)(xi)相(xiang)(xiang)輸(shu)送(song)(song)(song)(song)(song)可以(yi)(yi)被(bei)(bei)認為(wei)(wei)是(shi)(shi)(shi)一(yi)種(zhong)(zhong)完全的(de)(de)懸浮流(liu)(liu)，而(er)(er)密(mi)相(xiang)(xiang)輸(shu)送(song)(song)(song)(song)(song)通(tong)(tong)(tong)常被(bei)(bei)認為(wei)(wei)是(shi)(shi)(shi)非懸浮流(liu)(liu)。然而(er)(er)，如圖(tu)1所(suo)示(shi)，許多不同種(zhong)(zhong)類的(de)(de)密(mi)相(xiang)(xiang)（非懸浮流(liu)(liu)）依靠散(san)料(liao)(liao)(liao)的(de)(de)料(liao)(liao)(liao)性和流(liu)(liu)動性存在(zai)(zai)。密(mi)相(xiang)(xiang)輸(shu)送(song)(song)(song)(song)(song)同樣也(ye)(ye)能(neng)被(bei)(bei)定(ding)義為(wei)(wei)輸(shu)送(song)(song)(song)(song)(song)物料(liao)(liao)(liao)完全填(tian)滿(man)管(guan)道(dao)截面(mian)(mian)的(de)(de)一(yi)種(zhong)(zhong)輸(shu)送(song)(song)(song)(song)(song)方式(shi)(shi)。稀(xi)(xi)相(xiang)(xiang)輸(shu)送(song)(song)(song)(song)(song)通(tong)(tong)(tong)常需要(yao)使(shi)用大量(liang)的(de)(de)高速(su)氣(qi)(qi)體(ti)。氣(qi)(qi)流(liu)(liu)依靠升力(li)(li)和推(tui)動力(li)(li)以(yi)(yi)離散(san)粒(li)子(zi)(zi)的(de)(de)形式(shi)(shi)攜(xie)帶(dai)著物料(liao)(liao)(liao)。參考圖(tu)1中所(suo)述的(de)(de)“懸浮流(liu)(liu)”，稀(xi)(xi)相(xiang)(xiang)系統通(tong)(tong)(tong)常是(shi)(shi)(shi)最為(wei)(wei)被(bei)(bei)廣(guang)泛應用的(de)(de)氣(qi)(qi)力(li)(li)輸(shu)送(song)(song)(song)(song)(song)系統。由于(yu)稀(xi)(xi)相(xiang)(xiang)系統設計的(de)(de)相(xiang)(xiang)對(dui)簡單性，它們同時也(ye)(ye)被(bei)(bei)頻繁的(de)(de)應用在(zai)(zai)工業領域。輸(shu)送(song)(song)(song)(song)(song)氣(qi)(qi)體(ti)的(de)(de)速(su)度(du)(du)減少到比保持(chi)粒(li)子(zi)(zi)懸浮狀(zhuang)態的(de)(de)臨界值更小時，導致物料(liao)(liao)(liao)在(zai)(zai)輸(shu)送(song)(song)(song)(song)(song)管(guan)道(dao)的(de)(de)橫(heng)截面(mian)(mian)形成不均(jun)勻的(de)(de)分(fen)布。臨界氣(qi)(qi)體(ti)速(su)度(du)(du)被(bei)(bei)稱(cheng)為(wei)(wei)是(shi)(shi)(shi)水平輸(shu)送(song)(song)(song)(song)(song)的(de)(de)跳躍速(su)度(du)(du)，垂直輸(shu)送(song)(song)(song)(song)(song)時堵(du)塞。當水平管(guan)道(dao)中的(de)(de)物料(liao)(liao)(liao)表面(mian)(mian)氣(qi)(qi)體(ti)速(su)度(du)(du)低(di)于(yu)突變速(su)度(du)(du)時，輸(shu)送(song)(song)(song)(song)(song)將會以(yi)(yi)低(di)流(liu)(liu)量(liang)通(tong)(tong)(tong)過管(guan)道(dao)橫(heng)截面(mian)(mian)的(de)(de)上(shang)部，在(zai)(zai)管(guan)道(dao)的(de)(de)剩余部分(fen)以(yi)(yi)高濃(nong)度(du)(du)低(di)速(su)度(du)(du)的(de)(de)形式(shi)(shi)填(tian)充。有時沿(yan)管(guan)道(dao)的(de)(de)橫(heng)截面(mian)(mian)會被(bei)(bei)填(tian)滿(man)，而(er)(er)有時只是(shi)(shi)(shi)部分(fen)被(bei)(bei)填(tian)滿(man).

實際應(ying)用(yong)中(zhong), 按照氣(qi)力驅動形式可以分為(wei)負壓(ya)和正壓(ya)氣(qi)力輸(shu)(shu)送(song), 在這兩種輸(shu)(shu)送(song)系(xi)統中(zhong), 根(gen)據(ju)(ju)流動狀態圖再區分分為(wei)稀(xi)相, 密(mi)相和流化態輸(shu)(shu)送(song)系(xi)統. 除此之外,根(gen)據(ju)(ju)喂料不同分為(wei)連續和批次輸(shu)(shu)送(song). 在高(gao)壓(ya)密(mi)相輸(shu)(shu)送(song)技術(shu)中(zhong)常(chang)采用(yong)批次的壓(ya)力罐進行高(gao)壓(ya)輸(shu)(shu)送(song), 同時, 可以組合兩個壓(ya)力罐設計達到連續的輸(shu)(shu)送(song).

密相氣力輸送特點:

● 用氣量小, 節能

● 無殘留輸送

● 不堵塞, 運(yun)行可靠(kao)

● 維護費用低

● 適(shi)合于各類粉粒(li)物料

● 壓力至0. 6m p a可(ke)調

● 適合(he)于(yu)柔性(xing)化自動(dong)生產中(zhong)的物(wu)料(liao)高效(xiao)輸送