密(mi)相氣力輸送系列

氣(qi)力(li)輸送原理

氣力(li)輸(shu)(shu)(shu)送(song)(song)(song)(song)系統(tong)可(ke)分(fen)類(lei)為(wei)(wei)不(bu)同(tong)的(de)(de)(de)流(liu)(liu)動(dong)(dong)型(xing)(xing)式(shi)(shi)，其(qi)中(zhong)兩種主要(yao)型(xing)(xing)式(shi)(shi)是(shi)(shi)(shi)：(a) 稀相(xiang)輸(shu)(shu)(shu)送(song)(song)(song)(song)和(he)（b）密相(xiang)輸(shu)(shu)(shu)送(song)(song)(song)(song)每種流(liu)(liu)動(dong)(dong)型(xing)(xing)式(shi)(shi)可(ke)按(an)物(wu)料與空氣的(de)(de)(de)流(liu)(liu)量(liang)比(bi)率(lv)大小(xiao)分(fen)類(lei)，其(qi)比(bi)率(lv)也(ye)被(bei)(bei)稱為(wei)(wei)“固氣比(bi)”： μ=ms/mf (1)許多(duo)稀相(xiang)的(de)(de)(de)運行范圍為(wei)(wei)0＜μ＜15，而(er)密相(xiang)通常(chang)是(shi)(shi)(shi)μ＞15。圖(tu)1所示(shi)的(de)(de)(de)是(shi)(shi)(shi)典型(xing)(xing)輸(shu)(shu)(shu)送(song)(song)(song)(song)狀(zhuang)態圖(tu)。稀相(xiang)輸(shu)(shu)(shu)送(song)(song)(song)(song)可(ke)以(yi)被(bei)(bei)認(ren)為(wei)(wei)是(shi)(shi)(shi)一種完全(quan)(quan)的(de)(de)(de)懸浮流(liu)(liu)，而(er)密相(xiang)輸(shu)(shu)(shu)送(song)(song)(song)(song)通常(chang)被(bei)(bei)認(ren)為(wei)(wei)是(shi)(shi)(shi)非懸浮流(liu)(liu)。然而(er)，如圖(tu)1所示(shi)，許多(duo)不(bu)同(tong)種類(lei)的(de)(de)(de)密相(xiang)（非懸浮流(liu)(liu)）依靠散料的(de)(de)(de)料性和(he)流(liu)(liu)動(dong)(dong)性存在。密相(xiang)輸(shu)(shu)(shu)送(song)(song)(song)(song)同(tong)樣也(ye)能被(bei)(bei)定義為(wei)(wei)輸(shu)(shu)(shu)送(song)(song)(song)(song)物(wu)料完全(quan)(quan)填(tian)滿(man)管(guan)道截(jie)面(mian)的(de)(de)(de)一種輸(shu)(shu)(shu)送(song)(song)(song)(song)方式(shi)(shi)。稀相(xiang)輸(shu)(shu)(shu)送(song)(song)(song)(song)通常(chang)需要(yao)使(shi)用(yong)大量(liang)的(de)(de)(de)高速(su)(su)氣體。氣流(liu)(liu)依靠升(sheng)力(li)和(he)推動(dong)(dong)力(li)以(yi)離散粒子的(de)(de)(de)形式(shi)(shi)攜(xie)帶著物(wu)料。參考圖(tu)1中(zhong)所述的(de)(de)(de)“懸浮流(liu)(liu)”，稀相(xiang)系統(tong)通常(chang)是(shi)(shi)(shi)最為(wei)(wei)被(bei)(bei)廣泛應用(yong)的(de)(de)(de)氣力(li)輸(shu)(shu)(shu)送(song)(song)(song)(song)系統(tong)。由(you)于(yu)稀相(xiang)系統(tong)設(she)計的(de)(de)(de)相(xiang)對(dui)簡單性，它們同(tong)時也(ye)被(bei)(bei)頻(pin)繁的(de)(de)(de)應用(yong)在工(gong)業領(ling)域。輸(shu)(shu)(shu)送(song)(song)(song)(song)氣體的(de)(de)(de)速(su)(su)度(du)減少到比(bi)保持粒子懸浮狀(zhuang)態的(de)(de)(de)臨界(jie)值更小(xiao)時，導致物(wu)料在輸(shu)(shu)(shu)送(song)(song)(song)(song)管(guan)道的(de)(de)(de)橫截(jie)面(mian)形成不(bu)均勻(yun)的(de)(de)(de)分(fen)布(bu)。臨界(jie)氣體速(su)(su)度(du)被(bei)(bei)稱為(wei)(wei)是(shi)(shi)(shi)水(shui)平輸(shu)(shu)(shu)送(song)(song)(song)(song)的(de)(de)(de)跳躍(yue)速(su)(su)度(du)，垂直輸(shu)(shu)(shu)送(song)(song)(song)(song)時堵塞。當水(shui)平管(guan)道中(zhong)的(de)(de)(de)物(wu)料表面(mian)氣體速(su)(su)度(du)低于(yu)突變速(su)(su)度(du)時，輸(shu)(shu)(shu)送(song)(song)(song)(song)將會以(yi)低流(liu)(liu)量(liang)通過(guo)管(guan)道橫截(jie)面(mian)的(de)(de)(de)上部(bu)，在管(guan)道的(de)(de)(de)剩余部(bu)分(fen)以(yi)高濃(nong)度(du)低速(su)(su)度(du)的(de)(de)(de)形式(shi)(shi)填(tian)充(chong)。有時沿管(guan)道的(de)(de)(de)橫截(jie)面(mian)會被(bei)(bei)填(tian)滿(man)，而(er)有時只(zhi)是(shi)(shi)(shi)部(bu)分(fen)被(bei)(bei)填(tian)滿(man).

實際(ji)應用中, 按照氣力(li)驅動形式可以(yi)分為(wei)負壓(ya)和正(zheng)壓(ya)氣力(li)輸(shu)送(song), 在這兩種(zhong)輸(shu)送(song)系統中, 根據流動狀態(tai)(tai)圖再區(qu)分分為(wei)稀相, 密相和流化態(tai)(tai)輸(shu)送(song)系統. 除(chu)此之外(wai),根據喂料(liao)不同分為(wei)連續和批次輸(shu)送(song). 在高(gao)壓(ya)密相輸(shu)送(song)技(ji)術中常(chang)采用批次的(de)壓(ya)力(li)罐進(jin)行高(gao)壓(ya)輸(shu)送(song), 同時, 可以(yi)組(zu)合(he)兩個壓(ya)力(li)罐設計達到連續的(de)輸(shu)送(song).

密(mi)相氣力輸送特點:

● 用氣量小, 節能

● 無殘留輸送

● 不堵塞, 運行可靠(kao)

● 維護費用低

● 適(shi)合于(yu)各(ge)類粉粒物料(liao)

● 壓力(li)至0. 6m p a可調

● 適(shi)合于柔性化自動(dong)生產(chan)中的物料高(gao)效(xiao)輸送