密(mi)相氣力輸送(song)系(xi)列

氣力(li)輸送原理

氣(qi)力輸(shu)送(song)(song)(song)系(xi)(xi)(xi)統(tong)(tong)可分類為(wei)(wei)(wei)不同的(de)(de)(de)(de)流(liu)動(dong)(dong)型(xing)式(shi)(shi)，其中兩種(zhong)(zhong)主要型(xing)式(shi)(shi)是(shi)(shi)：(a) 稀(xi)相(xiang)(xiang)(xiang)輸(shu)送(song)(song)(song)和（b）密(mi)(mi)相(xiang)(xiang)(xiang)輸(shu)送(song)(song)(song)每種(zhong)(zhong)流(liu)動(dong)(dong)型(xing)式(shi)(shi)可按物(wu)料(liao)與空氣(qi)的(de)(de)(de)(de)流(liu)量比率大小分類，其比率也被(bei)(bei)(bei)稱(cheng)為(wei)(wei)(wei)“固氣(qi)比”： μ=ms/mf (1)許多稀(xi)相(xiang)(xiang)(xiang)的(de)(de)(de)(de)運行(xing)范圍為(wei)(wei)(wei)0＜μ＜15，而(er)密(mi)(mi)相(xiang)(xiang)(xiang)通常是(shi)(shi)μ＞15。圖(tu)1所(suo)示的(de)(de)(de)(de)是(shi)(shi)典型(xing)輸(shu)送(song)(song)(song)狀態圖(tu)。稀(xi)相(xiang)(xiang)(xiang)輸(shu)送(song)(song)(song)可以被(bei)(bei)(bei)認為(wei)(wei)(wei)是(shi)(shi)一種(zhong)(zhong)完(wan)全的(de)(de)(de)(de)懸(xuan)浮流(liu)，而(er)密(mi)(mi)相(xiang)(xiang)(xiang)輸(shu)送(song)(song)(song)通常被(bei)(bei)(bei)認為(wei)(wei)(wei)是(shi)(shi)非(fei)懸(xuan)浮流(liu)。然而(er)，如圖(tu)1所(suo)示，許多不同種(zhong)(zhong)類的(de)(de)(de)(de)密(mi)(mi)相(xiang)(xiang)(xiang)（非(fei)懸(xuan)浮流(liu)）依靠散(san)料(liao)的(de)(de)(de)(de)料(liao)性(xing)和流(liu)動(dong)(dong)性(xing)存在(zai)。密(mi)(mi)相(xiang)(xiang)(xiang)輸(shu)送(song)(song)(song)同樣也能被(bei)(bei)(bei)定義為(wei)(wei)(wei)輸(shu)送(song)(song)(song)物(wu)料(liao)完(wan)全填(tian)(tian)(tian)滿(man)(man)管道截(jie)(jie)面(mian)的(de)(de)(de)(de)一種(zhong)(zhong)輸(shu)送(song)(song)(song)方式(shi)(shi)。稀(xi)相(xiang)(xiang)(xiang)輸(shu)送(song)(song)(song)通常需要使用大量的(de)(de)(de)(de)高(gao)速(su)氣(qi)體。氣(qi)流(liu)依靠升(sheng)力和推(tui)動(dong)(dong)力以離散(san)粒(li)子(zi)的(de)(de)(de)(de)形式(shi)(shi)攜帶著物(wu)料(liao)。參考圖(tu)1中所(suo)述的(de)(de)(de)(de)“懸(xuan)浮流(liu)”，稀(xi)相(xiang)(xiang)(xiang)系(xi)(xi)(xi)統(tong)(tong)通常是(shi)(shi)最為(wei)(wei)(wei)被(bei)(bei)(bei)廣泛應(ying)(ying)用的(de)(de)(de)(de)氣(qi)力輸(shu)送(song)(song)(song)系(xi)(xi)(xi)統(tong)(tong)。由(you)于稀(xi)相(xiang)(xiang)(xiang)系(xi)(xi)(xi)統(tong)(tong)設計(ji)的(de)(de)(de)(de)相(xiang)(xiang)(xiang)對(dui)簡(jian)單性(xing)，它們同時(shi)(shi)也被(bei)(bei)(bei)頻繁的(de)(de)(de)(de)應(ying)(ying)用在(zai)工業領(ling)域。輸(shu)送(song)(song)(song)氣(qi)體的(de)(de)(de)(de)速(su)度(du)(du)(du)減(jian)少到(dao)比保持粒(li)子(zi)懸(xuan)浮狀態的(de)(de)(de)(de)臨界值更小時(shi)(shi)，導致物(wu)料(liao)在(zai)輸(shu)送(song)(song)(song)管道的(de)(de)(de)(de)橫(heng)截(jie)(jie)面(mian)形成(cheng)不均勻的(de)(de)(de)(de)分布。臨界氣(qi)體速(su)度(du)(du)(du)被(bei)(bei)(bei)稱(cheng)為(wei)(wei)(wei)是(shi)(shi)水(shui)平(ping)輸(shu)送(song)(song)(song)的(de)(de)(de)(de)跳躍速(su)度(du)(du)(du)，垂直輸(shu)送(song)(song)(song)時(shi)(shi)堵塞(sai)。當水(shui)平(ping)管道中的(de)(de)(de)(de)物(wu)料(liao)表面(mian)氣(qi)體速(su)度(du)(du)(du)低于突變速(su)度(du)(du)(du)時(shi)(shi)，輸(shu)送(song)(song)(song)將會以低流(liu)量通過(guo)管道橫(heng)截(jie)(jie)面(mian)的(de)(de)(de)(de)上部(bu)，在(zai)管道的(de)(de)(de)(de)剩余部(bu)分以高(gao)濃度(du)(du)(du)低速(su)度(du)(du)(du)的(de)(de)(de)(de)形式(shi)(shi)填(tian)(tian)(tian)充。有時(shi)(shi)沿管道的(de)(de)(de)(de)橫(heng)截(jie)(jie)面(mian)會被(bei)(bei)(bei)填(tian)(tian)(tian)滿(man)(man)，而(er)有時(shi)(shi)只是(shi)(shi)部(bu)分被(bei)(bei)(bei)填(tian)(tian)(tian)滿(man)(man).

實際應用(yong)中, 按照氣(qi)力(li)驅動(dong)形式(shi)可(ke)以(yi)分(fen)為負壓和(he)正壓氣(qi)力(li)輸送, 在這兩種輸送系統(tong)中, 根(gen)據流動(dong)狀態圖再區(qu)分(fen)分(fen)為稀相(xiang), 密相(xiang)和(he)流化態輸送系統(tong). 除(chu)此(ci)之(zhi)外,根(gen)據喂料不(bu)同分(fen)為連續和(he)批(pi)次(ci)(ci)輸送. 在高(gao)壓密相(xiang)輸送技術(shu)中常采用(yong)批(pi)次(ci)(ci)的壓力(li)罐進行(xing)高(gao)壓輸送, 同時, 可(ke)以(yi)組合兩個壓力(li)罐設計達到連續的輸送.

密相氣力輸送特點:

● 用氣量小, 節能

● 無殘留輸送

● 不堵塞, 運行可(ke)靠

● 維護(hu)費(fei)用低

● 適合于(yu)各類粉粒(li)物料(liao)

● 壓力至0. 6m p a可調

● 適合于(yu)柔性(xing)化自動生(sheng)產中的物料高效輸送