密相氣力輸送系列

氣力輸送原(yuan)理

氣(qi)(qi)力輸(shu)(shu)送(song)(song)(song)系統可(ke)分(fen)(fen)類(lei)(lei)為(wei)不(bu)同(tong)的(de)(de)(de)(de)(de)(de)流動(dong)型(xing)式(shi)，其(qi)中兩(liang)種(zhong)(zhong)主要(yao)型(xing)式(shi)是(shi)：(a) 稀(xi)相(xiang)(xiang)輸(shu)(shu)送(song)(song)(song)和（b）密(mi)相(xiang)(xiang)輸(shu)(shu)送(song)(song)(song)每種(zhong)(zhong)流動(dong)型(xing)式(shi)可(ke)按物(wu)料與(yu)空氣(qi)(qi)的(de)(de)(de)(de)(de)(de)流量比(bi)率大(da)小分(fen)(fen)類(lei)(lei)，其(qi)比(bi)率也(ye)(ye)被(bei)(bei)(bei)稱為(wei)“固氣(qi)(qi)比(bi)”： μ=ms/mf (1)許(xu)多(duo)稀(xi)相(xiang)(xiang)的(de)(de)(de)(de)(de)(de)運行(xing)范(fan)圍為(wei)0＜μ＜15，而密(mi)相(xiang)(xiang)通(tong)常(chang)是(shi)μ＞15。圖1所示(shi)的(de)(de)(de)(de)(de)(de)是(shi)典型(xing)輸(shu)(shu)送(song)(song)(song)狀態(tai)圖。稀(xi)相(xiang)(xiang)輸(shu)(shu)送(song)(song)(song)可(ke)以被(bei)(bei)(bei)認(ren)為(wei)是(shi)一(yi)種(zhong)(zhong)完全(quan)的(de)(de)(de)(de)(de)(de)懸浮(fu)流，而密(mi)相(xiang)(xiang)輸(shu)(shu)送(song)(song)(song)通(tong)常(chang)被(bei)(bei)(bei)認(ren)為(wei)是(shi)非(fei)懸浮(fu)流。然而，如圖1所示(shi)，許(xu)多(duo)不(bu)同(tong)種(zhong)(zhong)類(lei)(lei)的(de)(de)(de)(de)(de)(de)密(mi)相(xiang)(xiang)（非(fei)懸浮(fu)流）依靠散(san)(san)料的(de)(de)(de)(de)(de)(de)料性(xing)(xing)和流動(dong)性(xing)(xing)存在(zai)(zai)。密(mi)相(xiang)(xiang)輸(shu)(shu)送(song)(song)(song)同(tong)樣也(ye)(ye)能(neng)被(bei)(bei)(bei)定(ding)義為(wei)輸(shu)(shu)送(song)(song)(song)物(wu)料完全(quan)填(tian)滿(man)管(guan)(guan)(guan)道(dao)截面(mian)的(de)(de)(de)(de)(de)(de)一(yi)種(zhong)(zhong)輸(shu)(shu)送(song)(song)(song)方式(shi)。稀(xi)相(xiang)(xiang)輸(shu)(shu)送(song)(song)(song)通(tong)常(chang)需要(yao)使(shi)用(yong)大(da)量的(de)(de)(de)(de)(de)(de)高速氣(qi)(qi)體。氣(qi)(qi)流依靠升力和推動(dong)力以離散(san)(san)粒子的(de)(de)(de)(de)(de)(de)形式(shi)攜(xie)帶著物(wu)料。參考圖1中所述的(de)(de)(de)(de)(de)(de)“懸浮(fu)流”，稀(xi)相(xiang)(xiang)系統通(tong)常(chang)是(shi)最為(wei)被(bei)(bei)(bei)廣泛應用(yong)的(de)(de)(de)(de)(de)(de)氣(qi)(qi)力輸(shu)(shu)送(song)(song)(song)系統。由于稀(xi)相(xiang)(xiang)系統設計的(de)(de)(de)(de)(de)(de)相(xiang)(xiang)對(dui)簡(jian)單(dan)性(xing)(xing)，它們同(tong)時(shi)也(ye)(ye)被(bei)(bei)(bei)頻繁(fan)的(de)(de)(de)(de)(de)(de)應用(yong)在(zai)(zai)工業(ye)領域。輸(shu)(shu)送(song)(song)(song)氣(qi)(qi)體的(de)(de)(de)(de)(de)(de)速度(du)減少到比(bi)保持粒子懸浮(fu)狀態(tai)的(de)(de)(de)(de)(de)(de)臨界(jie)值更小時(shi)，導致物(wu)料在(zai)(zai)輸(shu)(shu)送(song)(song)(song)管(guan)(guan)(guan)道(dao)的(de)(de)(de)(de)(de)(de)橫截面(mian)形成不(bu)均勻(yun)的(de)(de)(de)(de)(de)(de)分(fen)(fen)布。臨界(jie)氣(qi)(qi)體速度(du)被(bei)(bei)(bei)稱為(wei)是(shi)水(shui)平(ping)輸(shu)(shu)送(song)(song)(song)的(de)(de)(de)(de)(de)(de)跳躍速度(du)，垂(chui)直輸(shu)(shu)送(song)(song)(song)時(shi)堵塞(sai)。當水(shui)平(ping)管(guan)(guan)(guan)道(dao)中的(de)(de)(de)(de)(de)(de)物(wu)料表面(mian)氣(qi)(qi)體速度(du)低(di)于突變速度(du)時(shi)，輸(shu)(shu)送(song)(song)(song)將會以低(di)流量通(tong)過管(guan)(guan)(guan)道(dao)橫截面(mian)的(de)(de)(de)(de)(de)(de)上部，在(zai)(zai)管(guan)(guan)(guan)道(dao)的(de)(de)(de)(de)(de)(de)剩余部分(fen)(fen)以高濃(nong)度(du)低(di)速度(du)的(de)(de)(de)(de)(de)(de)形式(shi)填(tian)充。有時(shi)沿(yan)管(guan)(guan)(guan)道(dao)的(de)(de)(de)(de)(de)(de)橫截面(mian)會被(bei)(bei)(bei)填(tian)滿(man)，而有時(shi)只是(shi)部分(fen)(fen)被(bei)(bei)(bei)填(tian)滿(man).

實際應(ying)用(yong)中(zhong), 按照氣力(li)驅動(dong)形式可(ke)(ke)以分為負(fu)壓和正壓氣力(li)輸(shu)(shu)(shu)送(song)(song), 在這兩種輸(shu)(shu)(shu)送(song)(song)系統(tong)中(zhong), 根據流動(dong)狀(zhuang)態圖(tu)再區分分為稀相(xiang), 密(mi)相(xiang)和流化態輸(shu)(shu)(shu)送(song)(song)系統(tong). 除此之外,根據喂料不同(tong)分為連續和批次輸(shu)(shu)(shu)送(song)(song). 在高壓密(mi)相(xiang)輸(shu)(shu)(shu)送(song)(song)技術中(zhong)常采用(yong)批次的壓力(li)罐(guan)進行(xing)高壓輸(shu)(shu)(shu)送(song)(song), 同(tong)時, 可(ke)(ke)以組合兩個壓力(li)罐(guan)設(she)計達到連續的輸(shu)(shu)(shu)送(song)(song).

密相氣(qi)力輸送特點(dian):

● 用氣量小, 節能

● 無殘留輸送

● 不堵塞, 運行可靠

● 維護費用低

● 適合于各類粉粒物料(liao)

● 壓力至0. 6m p a可調

● 適合于柔性化自動生產(chan)中的(de)物料高效輸送(song)