密相氣力輸送系(xi)列

氣(qi)力輸(shu)送(song)原理

氣(qi)(qi)力(li)輸(shu)(shu)(shu)送(song)(song)(song)系(xi)統(tong)可分類(lei)為不(bu)同的(de)(de)(de)(de)流(liu)(liu)(liu)(liu)動(dong)(dong)型(xing)式(shi)(shi)(shi)，其中兩(liang)種(zhong)(zhong)主要型(xing)式(shi)(shi)(shi)是(shi)：(a) 稀(xi)相(xiang)輸(shu)(shu)(shu)送(song)(song)(song)和(he)（b）密(mi)相(xiang)輸(shu)(shu)(shu)送(song)(song)(song)每種(zhong)(zhong)流(liu)(liu)(liu)(liu)動(dong)(dong)型(xing)式(shi)(shi)(shi)可按(an)物料(liao)(liao)與空氣(qi)(qi)的(de)(de)(de)(de)流(liu)(liu)(liu)(liu)量比(bi)(bi)率大小(xiao)分類(lei)，其比(bi)(bi)率也(ye)被(bei)(bei)稱為“固氣(qi)(qi)比(bi)(bi)”： μ=ms/mf (1)許多稀(xi)相(xiang)的(de)(de)(de)(de)運行范圍為0＜μ＜15，而(er)密(mi)相(xiang)通(tong)(tong)常(chang)是(shi)μ＞15。圖(tu)1所示的(de)(de)(de)(de)是(shi)典型(xing)輸(shu)(shu)(shu)送(song)(song)(song)狀(zhuang)態圖(tu)。稀(xi)相(xiang)輸(shu)(shu)(shu)送(song)(song)(song)可以被(bei)(bei)認(ren)為是(shi)一種(zhong)(zhong)完(wan)全(quan)(quan)的(de)(de)(de)(de)懸(xuan)浮流(liu)(liu)(liu)(liu)，而(er)密(mi)相(xiang)輸(shu)(shu)(shu)送(song)(song)(song)通(tong)(tong)常(chang)被(bei)(bei)認(ren)為是(shi)非懸(xuan)浮流(liu)(liu)(liu)(liu)。然而(er)，如圖(tu)1所示，許多不(bu)同種(zhong)(zhong)類(lei)的(de)(de)(de)(de)密(mi)相(xiang)（非懸(xuan)浮流(liu)(liu)(liu)(liu)）依(yi)(yi)靠散(san)料(liao)(liao)的(de)(de)(de)(de)料(liao)(liao)性(xing)(xing)(xing)和(he)流(liu)(liu)(liu)(liu)動(dong)(dong)性(xing)(xing)(xing)存在(zai)(zai)。密(mi)相(xiang)輸(shu)(shu)(shu)送(song)(song)(song)同樣也(ye)能被(bei)(bei)定義為輸(shu)(shu)(shu)送(song)(song)(song)物料(liao)(liao)完(wan)全(quan)(quan)填(tian)滿(man)(man)管(guan)道(dao)截(jie)面(mian)的(de)(de)(de)(de)一種(zhong)(zhong)輸(shu)(shu)(shu)送(song)(song)(song)方式(shi)(shi)(shi)。稀(xi)相(xiang)輸(shu)(shu)(shu)送(song)(song)(song)通(tong)(tong)常(chang)需要使用大量的(de)(de)(de)(de)高速(su)氣(qi)(qi)體(ti)(ti)。氣(qi)(qi)流(liu)(liu)(liu)(liu)依(yi)(yi)靠升力(li)和(he)推動(dong)(dong)力(li)以離散(san)粒子的(de)(de)(de)(de)形式(shi)(shi)(shi)攜(xie)帶著物料(liao)(liao)。參考圖(tu)1中所述(shu)的(de)(de)(de)(de)“懸(xuan)浮流(liu)(liu)(liu)(liu)”，稀(xi)相(xiang)系(xi)統(tong)通(tong)(tong)常(chang)是(shi)最為被(bei)(bei)廣泛應(ying)用的(de)(de)(de)(de)氣(qi)(qi)力(li)輸(shu)(shu)(shu)送(song)(song)(song)系(xi)統(tong)。由于稀(xi)相(xiang)系(xi)統(tong)設計的(de)(de)(de)(de)相(xiang)對(dui)簡(jian)單性(xing)(xing)(xing)，它們同時(shi)(shi)(shi)(shi)也(ye)被(bei)(bei)頻(pin)繁的(de)(de)(de)(de)應(ying)用在(zai)(zai)工(gong)業(ye)領域。輸(shu)(shu)(shu)送(song)(song)(song)氣(qi)(qi)體(ti)(ti)的(de)(de)(de)(de)速(su)度(du)減少(shao)到比(bi)(bi)保持粒子懸(xuan)浮狀(zhuang)態的(de)(de)(de)(de)臨界值更小(xiao)時(shi)(shi)(shi)(shi)，導致物料(liao)(liao)在(zai)(zai)輸(shu)(shu)(shu)送(song)(song)(song)管(guan)道(dao)的(de)(de)(de)(de)橫截(jie)面(mian)形成不(bu)均勻的(de)(de)(de)(de)分布。臨界氣(qi)(qi)體(ti)(ti)速(su)度(du)被(bei)(bei)稱為是(shi)水(shui)平(ping)輸(shu)(shu)(shu)送(song)(song)(song)的(de)(de)(de)(de)跳(tiao)躍(yue)速(su)度(du)，垂直輸(shu)(shu)(shu)送(song)(song)(song)時(shi)(shi)(shi)(shi)堵塞。當水(shui)平(ping)管(guan)道(dao)中的(de)(de)(de)(de)物料(liao)(liao)表面(mian)氣(qi)(qi)體(ti)(ti)速(su)度(du)低于突變速(su)度(du)時(shi)(shi)(shi)(shi)，輸(shu)(shu)(shu)送(song)(song)(song)將會(hui)以低流(liu)(liu)(liu)(liu)量通(tong)(tong)過(guo)管(guan)道(dao)橫截(jie)面(mian)的(de)(de)(de)(de)上(shang)部，在(zai)(zai)管(guan)道(dao)的(de)(de)(de)(de)剩余部分以高濃(nong)度(du)低速(su)度(du)的(de)(de)(de)(de)形式(shi)(shi)(shi)填(tian)充。有(you)時(shi)(shi)(shi)(shi)沿(yan)管(guan)道(dao)的(de)(de)(de)(de)橫截(jie)面(mian)會(hui)被(bei)(bei)填(tian)滿(man)(man)，而(er)有(you)時(shi)(shi)(shi)(shi)只(zhi)是(shi)部分被(bei)(bei)填(tian)滿(man)(man).

實際應(ying)用中, 按照(zhao)氣力驅動(dong)形式可以分為負壓(ya)和正壓(ya)氣力輸(shu)(shu)送(song)(song), 在這兩種輸(shu)(shu)送(song)(song)系統中, 根(gen)據流(liu)動(dong)狀態圖再區分分為稀相, 密相和流(liu)化態輸(shu)(shu)送(song)(song)系統. 除此之外(wai),根(gen)據喂料不(bu)同分為連(lian)續和批(pi)次輸(shu)(shu)送(song)(song). 在高(gao)壓(ya)密相輸(shu)(shu)送(song)(song)技術中常(chang)采用批(pi)次的壓(ya)力罐(guan)進行高(gao)壓(ya)輸(shu)(shu)送(song)(song), 同時, 可以組合兩個壓(ya)力罐(guan)設計(ji)達到連(lian)續的輸(shu)(shu)送(song)(song).

密相氣力(li)輸送(song)特點:

● 用(yong)氣量小, 節能

● 無殘留輸送

● 不(bu)堵塞(sai), 運行可靠

● 維護(hu)費(fei)用低

● 適合于各(ge)類粉粒(li)物(wu)料(liao)

● 壓力至0. 6m p a可調

● 適合于柔性化自動生產中的(de)物料(liao)高(gao)效輸送