密相氣力輸送系(xi)列

氣力(li)輸(shu)送原理

氣力(li)輸(shu)(shu)(shu)送(song)(song)系統可(ke)分類(lei)(lei)為(wei)(wei)不同(tong)的(de)(de)(de)(de)流(liu)(liu)動型式(shi)，其中(zhong)兩種(zhong)(zhong)主要型式(shi)是(shi)：(a) 稀(xi)相(xiang)(xiang)輸(shu)(shu)(shu)送(song)(song)和(he)（b）密(mi)相(xiang)(xiang)輸(shu)(shu)(shu)送(song)(song)每種(zhong)(zhong)流(liu)(liu)動型式(shi)可(ke)按物(wu)(wu)料(liao)與(yu)空氣的(de)(de)(de)(de)流(liu)(liu)量比率(lv)大小分類(lei)(lei)，其比率(lv)也(ye)被(bei)稱為(wei)(wei)“固(gu)氣比”： μ=ms/mf (1)許多稀(xi)相(xiang)(xiang)的(de)(de)(de)(de)運行范圍為(wei)(wei)0＜μ＜15，而密(mi)相(xiang)(xiang)通(tong)常(chang)(chang)是(shi)μ＞15。圖1所(suo)示的(de)(de)(de)(de)是(shi)典型輸(shu)(shu)(shu)送(song)(song)狀態圖。稀(xi)相(xiang)(xiang)輸(shu)(shu)(shu)送(song)(song)可(ke)以被(bei)認為(wei)(wei)是(shi)一種(zhong)(zhong)完全(quan)的(de)(de)(de)(de)懸(xuan)浮(fu)流(liu)(liu)，而密(mi)相(xiang)(xiang)輸(shu)(shu)(shu)送(song)(song)通(tong)常(chang)(chang)被(bei)認為(wei)(wei)是(shi)非懸(xuan)浮(fu)流(liu)(liu)。然而，如圖1所(suo)示，許多不同(tong)種(zhong)(zhong)類(lei)(lei)的(de)(de)(de)(de)密(mi)相(xiang)(xiang)（非懸(xuan)浮(fu)流(liu)(liu)）依靠散料(liao)的(de)(de)(de)(de)料(liao)性和(he)流(liu)(liu)動性存在。密(mi)相(xiang)(xiang)輸(shu)(shu)(shu)送(song)(song)同(tong)樣也(ye)能被(bei)定義為(wei)(wei)輸(shu)(shu)(shu)送(song)(song)物(wu)(wu)料(liao)完全(quan)填滿(man)管道(dao)截(jie)(jie)面(mian)(mian)的(de)(de)(de)(de)一種(zhong)(zhong)輸(shu)(shu)(shu)送(song)(song)方式(shi)。稀(xi)相(xiang)(xiang)輸(shu)(shu)(shu)送(song)(song)通(tong)常(chang)(chang)需(xu)要使用大量的(de)(de)(de)(de)高速氣體(ti)(ti)。氣流(liu)(liu)依靠升力(li)和(he)推動力(li)以離(li)散粒子(zi)的(de)(de)(de)(de)形式(shi)攜帶著物(wu)(wu)料(liao)。參考(kao)圖1中(zhong)所(suo)述的(de)(de)(de)(de)“懸(xuan)浮(fu)流(liu)(liu)”，稀(xi)相(xiang)(xiang)系統通(tong)常(chang)(chang)是(shi)最為(wei)(wei)被(bei)廣(guang)泛應用的(de)(de)(de)(de)氣力(li)輸(shu)(shu)(shu)送(song)(song)系統。由(you)于稀(xi)相(xiang)(xiang)系統設計的(de)(de)(de)(de)相(xiang)(xiang)對(dui)簡單性，它(ta)們同(tong)時(shi)也(ye)被(bei)頻繁的(de)(de)(de)(de)應用在工業領域(yu)。輸(shu)(shu)(shu)送(song)(song)氣體(ti)(ti)的(de)(de)(de)(de)速度(du)減少(shao)到(dao)比保持粒子(zi)懸(xuan)浮(fu)狀態的(de)(de)(de)(de)臨(lin)界值更小時(shi)，導致物(wu)(wu)料(liao)在輸(shu)(shu)(shu)送(song)(song)管道(dao)的(de)(de)(de)(de)橫(heng)(heng)截(jie)(jie)面(mian)(mian)形成(cheng)不均勻的(de)(de)(de)(de)分布。臨(lin)界氣體(ti)(ti)速度(du)被(bei)稱為(wei)(wei)是(shi)水平(ping)輸(shu)(shu)(shu)送(song)(song)的(de)(de)(de)(de)跳躍速度(du)，垂直輸(shu)(shu)(shu)送(song)(song)時(shi)堵(du)塞。當水平(ping)管道(dao)中(zhong)的(de)(de)(de)(de)物(wu)(wu)料(liao)表面(mian)(mian)氣體(ti)(ti)速度(du)低于突(tu)變速度(du)時(shi)，輸(shu)(shu)(shu)送(song)(song)將會以低流(liu)(liu)量通(tong)過管道(dao)橫(heng)(heng)截(jie)(jie)面(mian)(mian)的(de)(de)(de)(de)上部，在管道(dao)的(de)(de)(de)(de)剩余(yu)部分以高濃度(du)低速度(du)的(de)(de)(de)(de)形式(shi)填充。有時(shi)沿管道(dao)的(de)(de)(de)(de)橫(heng)(heng)截(jie)(jie)面(mian)(mian)會被(bei)填滿(man)，而有時(shi)只是(shi)部分被(bei)填滿(man).

實際(ji)應(ying)用(yong)(yong)中(zhong), 按(an)照(zhao)氣力(li)驅(qu)動(dong)形式(shi)可以分(fen)為負壓(ya)和(he)(he)正壓(ya)氣力(li)輸(shu)送(song)(song), 在這兩種輸(shu)送(song)(song)系統(tong)中(zhong), 根據流動(dong)狀態圖再區(qu)分(fen)分(fen)為稀相(xiang), 密相(xiang)和(he)(he)流化態輸(shu)送(song)(song)系統(tong). 除此之外,根據喂料(liao)不同(tong)分(fen)為連續和(he)(he)批(pi)次輸(shu)送(song)(song). 在高(gao)壓(ya)密相(xiang)輸(shu)送(song)(song)技術中(zhong)常采用(yong)(yong)批(pi)次的(de)壓(ya)力(li)罐進(jin)行高(gao)壓(ya)輸(shu)送(song)(song), 同(tong)時, 可以組(zu)合兩個(ge)壓(ya)力(li)罐設計達到連續的(de)輸(shu)送(song)(song).

密相氣力輸送特點:

● 用氣量小, 節能

● 無殘留輸送

● 不堵塞, 運行(xing)可靠(kao)

● 維護費用低

● 適合于(yu)各類粉粒(li)物(wu)料(liao)

● 壓力至0. 6m p a可(ke)調

● 適(shi)合于柔性化自(zi)動生產中的物料高效輸送