密(mi)相氣力輸(shu)送系(xi)列

氣(qi)力輸(shu)送原理

氣(qi)力輸(shu)(shu)(shu)(shu)送(song)(song)(song)系統(tong)(tong)可分(fen)(fen)(fen)(fen)類為不(bu)同(tong)的(de)流(liu)(liu)動型(xing)式(shi)，其(qi)中兩(liang)種(zhong)主(zhu)要(yao)型(xing)式(shi)是(shi)(shi)：(a) 稀相(xiang)(xiang)輸(shu)(shu)(shu)(shu)送(song)(song)(song)和(he)(he)（b）密(mi)相(xiang)(xiang)輸(shu)(shu)(shu)(shu)送(song)(song)(song)每種(zhong)流(liu)(liu)動型(xing)式(shi)可按物料與空(kong)氣(qi)的(de)流(liu)(liu)量(liang)(liang)比率大小分(fen)(fen)(fen)(fen)類，其(qi)比率也被(bei)稱(cheng)為“固氣(qi)比”： μ=ms/mf (1)許多稀相(xiang)(xiang)的(de)運(yun)行(xing)范圍為0＜μ＜15，而(er)(er)密(mi)相(xiang)(xiang)通(tong)(tong)(tong)(tong)常(chang)是(shi)(shi)μ＞15。圖1所(suo)示的(de)是(shi)(shi)典型(xing)輸(shu)(shu)(shu)(shu)送(song)(song)(song)狀態圖。稀相(xiang)(xiang)輸(shu)(shu)(shu)(shu)送(song)(song)(song)可以(yi)被(bei)認為是(shi)(shi)一種(zhong)完全(quan)的(de)懸(xuan)(xuan)浮(fu)(fu)(fu)流(liu)(liu)，而(er)(er)密(mi)相(xiang)(xiang)輸(shu)(shu)(shu)(shu)送(song)(song)(song)通(tong)(tong)(tong)(tong)常(chang)被(bei)認為是(shi)(shi)非(fei)懸(xuan)(xuan)浮(fu)(fu)(fu)流(liu)(liu)。然而(er)(er)，如圖1所(suo)示，許多不(bu)同(tong)種(zhong)類的(de)密(mi)相(xiang)(xiang)（非(fei)懸(xuan)(xuan)浮(fu)(fu)(fu)流(liu)(liu)）依(yi)靠散料的(de)料性和(he)(he)流(liu)(liu)動性存(cun)在。密(mi)相(xiang)(xiang)輸(shu)(shu)(shu)(shu)送(song)(song)(song)同(tong)樣(yang)也能被(bei)定(ding)義為輸(shu)(shu)(shu)(shu)送(song)(song)(song)物料完全(quan)填(tian)滿管(guan)道截(jie)(jie)面的(de)一種(zhong)輸(shu)(shu)(shu)(shu)送(song)(song)(song)方式(shi)。稀相(xiang)(xiang)輸(shu)(shu)(shu)(shu)送(song)(song)(song)通(tong)(tong)(tong)(tong)常(chang)需要(yao)使用(yong)大量(liang)(liang)的(de)高速(su)氣(qi)體。氣(qi)流(liu)(liu)依(yi)靠升力和(he)(he)推動力以(yi)離散粒(li)子的(de)形(xing)式(shi)攜帶著物料。參考圖1中所(suo)述的(de)“懸(xuan)(xuan)浮(fu)(fu)(fu)流(liu)(liu)”，稀相(xiang)(xiang)系統(tong)(tong)通(tong)(tong)(tong)(tong)常(chang)是(shi)(shi)最為被(bei)廣泛應(ying)用(yong)的(de)氣(qi)力輸(shu)(shu)(shu)(shu)送(song)(song)(song)系統(tong)(tong)。由于(yu)稀相(xiang)(xiang)系統(tong)(tong)設(she)計的(de)相(xiang)(xiang)對簡單(dan)性，它們(men)同(tong)時(shi)也被(bei)頻繁的(de)應(ying)用(yong)在工業領域。輸(shu)(shu)(shu)(shu)送(song)(song)(song)氣(qi)體的(de)速(su)度(du)減少到(dao)比保持粒(li)子懸(xuan)(xuan)浮(fu)(fu)(fu)狀態的(de)臨界值(zhi)更小時(shi)，導致(zhi)物料在輸(shu)(shu)(shu)(shu)送(song)(song)(song)管(guan)道的(de)橫截(jie)(jie)面形(xing)成不(bu)均(jun)勻的(de)分(fen)(fen)(fen)(fen)布。臨界氣(qi)體速(su)度(du)被(bei)稱(cheng)為是(shi)(shi)水平(ping)輸(shu)(shu)(shu)(shu)送(song)(song)(song)的(de)跳躍速(su)度(du)，垂直輸(shu)(shu)(shu)(shu)送(song)(song)(song)時(shi)堵塞。當水平(ping)管(guan)道中的(de)物料表(biao)面氣(qi)體速(su)度(du)低(di)(di)于(yu)突變速(su)度(du)時(shi)，輸(shu)(shu)(shu)(shu)送(song)(song)(song)將會以(yi)低(di)(di)流(liu)(liu)量(liang)(liang)通(tong)(tong)(tong)(tong)過管(guan)道橫截(jie)(jie)面的(de)上部，在管(guan)道的(de)剩余部分(fen)(fen)(fen)(fen)以(yi)高濃度(du)低(di)(di)速(su)度(du)的(de)形(xing)式(shi)填(tian)充(chong)。有(you)時(shi)沿管(guan)道的(de)橫截(jie)(jie)面會被(bei)填(tian)滿，而(er)(er)有(you)時(shi)只是(shi)(shi)部分(fen)(fen)(fen)(fen)被(bei)填(tian)滿.

實際應用中, 按照氣力驅動形式(shi)可以分為負壓(ya)和正壓(ya)氣力輸送, 在這兩種輸送系統中, 根(gen)據流動狀態(tai)(tai)圖再區(qu)分分為稀相, 密相和流化(hua)態(tai)(tai)輸送系統. 除此之外(wai),根(gen)據喂料不同(tong)分為連續(xu)和批(pi)次(ci)輸送. 在高壓(ya)密相輸送技術中常采用批(pi)次(ci)的(de)壓(ya)力罐進行高壓(ya)輸送, 同(tong)時, 可以組合(he)兩個壓(ya)力罐設計達到(dao)連續(xu)的(de)輸送.

密相氣力輸送特點:

● 用(yong)氣量(liang)小, 節能

● 無殘留輸送

● 不堵塞, 運行可靠(kao)

● 維護費(fei)用低

● 適合于各類粉粒物料

● 壓力至(zhi)0. 6m p a可(ke)調

● 適合于(yu)柔性化(hua)自動(dong)生(sheng)產(chan)中的(de)物(wu)料高效輸送