密相氣力輸送系(xi)列

氣力輸送原理

氣(qi)力輸(shu)(shu)(shu)(shu)(shu)送(song)系(xi)(xi)統可分類為(wei)不同的(de)(de)流(liu)動型(xing)式(shi)，其中(zhong)兩種(zhong)主要型(xing)式(shi)是(shi)(shi)：(a) 稀相(xiang)(xiang)(xiang)輸(shu)(shu)(shu)(shu)(shu)送(song)和(he)（b）密(mi)(mi)相(xiang)(xiang)(xiang)輸(shu)(shu)(shu)(shu)(shu)送(song)每種(zhong)流(liu)動型(xing)式(shi)可按物料(liao)與空氣(qi)的(de)(de)流(liu)量比(bi)(bi)率大小(xiao)分類，其比(bi)(bi)率也(ye)(ye)被稱為(wei)“固氣(qi)比(bi)(bi)”： μ=ms/mf (1)許(xu)(xu)多稀相(xiang)(xiang)(xiang)的(de)(de)運(yun)行范圍為(wei)0＜μ＜15，而密(mi)(mi)相(xiang)(xiang)(xiang)通(tong)常(chang)是(shi)(shi)μ＞15。圖(tu)1所示的(de)(de)是(shi)(shi)典型(xing)輸(shu)(shu)(shu)(shu)(shu)送(song)狀態圖(tu)。稀相(xiang)(xiang)(xiang)輸(shu)(shu)(shu)(shu)(shu)送(song)可以(yi)被認為(wei)是(shi)(shi)一(yi)種(zhong)完全(quan)的(de)(de)懸(xuan)(xuan)浮(fu)(fu)流(liu)，而密(mi)(mi)相(xiang)(xiang)(xiang)輸(shu)(shu)(shu)(shu)(shu)送(song)通(tong)常(chang)被認為(wei)是(shi)(shi)非懸(xuan)(xuan)浮(fu)(fu)流(liu)。然而，如圖(tu)1所示，許(xu)(xu)多不同種(zhong)類的(de)(de)密(mi)(mi)相(xiang)(xiang)(xiang)（非懸(xuan)(xuan)浮(fu)(fu)流(liu)）依(yi)(yi)靠散料(liao)的(de)(de)料(liao)性和(he)流(liu)動性存在。密(mi)(mi)相(xiang)(xiang)(xiang)輸(shu)(shu)(shu)(shu)(shu)送(song)同樣也(ye)(ye)能被定(ding)義為(wei)輸(shu)(shu)(shu)(shu)(shu)送(song)物料(liao)完全(quan)填滿管(guan)道(dao)(dao)截(jie)面(mian)(mian)的(de)(de)一(yi)種(zhong)輸(shu)(shu)(shu)(shu)(shu)送(song)方式(shi)。稀相(xiang)(xiang)(xiang)輸(shu)(shu)(shu)(shu)(shu)送(song)通(tong)常(chang)需要使(shi)用(yong)大量的(de)(de)高(gao)速氣(qi)體(ti)(ti)。氣(qi)流(liu)依(yi)(yi)靠升力和(he)推動力以(yi)離散粒(li)子的(de)(de)形式(shi)攜(xie)帶著(zhu)物料(liao)。參考圖(tu)1中(zhong)所述的(de)(de)“懸(xuan)(xuan)浮(fu)(fu)流(liu)”，稀相(xiang)(xiang)(xiang)系(xi)(xi)統通(tong)常(chang)是(shi)(shi)最為(wei)被廣泛應用(yong)的(de)(de)氣(qi)力輸(shu)(shu)(shu)(shu)(shu)送(song)系(xi)(xi)統。由(you)于稀相(xiang)(xiang)(xiang)系(xi)(xi)統設計的(de)(de)相(xiang)(xiang)(xiang)對簡單性，它們同時也(ye)(ye)被頻繁的(de)(de)應用(yong)在工業領(ling)域。輸(shu)(shu)(shu)(shu)(shu)送(song)氣(qi)體(ti)(ti)的(de)(de)速度(du)(du)減少(shao)到(dao)比(bi)(bi)保持粒(li)子懸(xuan)(xuan)浮(fu)(fu)狀態的(de)(de)臨界(jie)值更小(xiao)時，導致物料(liao)在輸(shu)(shu)(shu)(shu)(shu)送(song)管(guan)道(dao)(dao)的(de)(de)橫(heng)截(jie)面(mian)(mian)形成不均勻的(de)(de)分布。臨界(jie)氣(qi)體(ti)(ti)速度(du)(du)被稱為(wei)是(shi)(shi)水平(ping)輸(shu)(shu)(shu)(shu)(shu)送(song)的(de)(de)跳(tiao)躍速度(du)(du)，垂直(zhi)輸(shu)(shu)(shu)(shu)(shu)送(song)時堵塞。當(dang)水平(ping)管(guan)道(dao)(dao)中(zhong)的(de)(de)物料(liao)表面(mian)(mian)氣(qi)體(ti)(ti)速度(du)(du)低(di)于突變(bian)速度(du)(du)時，輸(shu)(shu)(shu)(shu)(shu)送(song)將會以(yi)低(di)流(liu)量通(tong)過管(guan)道(dao)(dao)橫(heng)截(jie)面(mian)(mian)的(de)(de)上部，在管(guan)道(dao)(dao)的(de)(de)剩余部分以(yi)高(gao)濃度(du)(du)低(di)速度(du)(du)的(de)(de)形式(shi)填充(chong)。有(you)時沿管(guan)道(dao)(dao)的(de)(de)橫(heng)截(jie)面(mian)(mian)會被填滿，而有(you)時只是(shi)(shi)部分被填滿.

實際(ji)應用中, 按照氣(qi)力驅動形式可(ke)以(yi)分為負壓(ya)(ya)和(he)正壓(ya)(ya)氣(qi)力輸送(song), 在這兩種輸送(song)系(xi)統中, 根據流動狀態(tai)圖再區分分為稀(xi)相(xiang)(xiang), 密相(xiang)(xiang)和(he)流化態(tai)輸送(song)系(xi)統. 除(chu)此之外,根據喂料不同(tong)分為連(lian)續(xu)和(he)批次輸送(song). 在高壓(ya)(ya)密相(xiang)(xiang)輸送(song)技術(shu)中常采用批次的壓(ya)(ya)力罐進行(xing)高壓(ya)(ya)輸送(song), 同(tong)時, 可(ke)以(yi)組合(he)兩個壓(ya)(ya)力罐設計達(da)到連(lian)續(xu)的輸送(song).

密相氣力(li)輸送特點:

● 用氣量小, 節能

● 無殘留輸送

● 不(bu)堵塞, 運行可靠

● 維護費用低

● 適合于各類粉粒物(wu)料

● 壓力至0. 6m p a可調(diao)

● 適合(he)于柔(rou)性化(hua)自動生產中的物(wu)料高效(xiao)輸送