密相氣力輸送系(xi)列(lie)

氣力輸送原理(li)

氣(qi)(qi)力輸(shu)(shu)(shu)(shu)送(song)(song)系(xi)統(tong)(tong)可(ke)分(fen)類為不同(tong)(tong)的(de)(de)(de)(de)(de)(de)流(liu)動型(xing)式(shi)，其(qi)中(zhong)(zhong)兩(liang)種(zhong)主要(yao)型(xing)式(shi)是(shi)(shi)(shi)(shi)：(a) 稀(xi)相(xiang)輸(shu)(shu)(shu)(shu)送(song)(song)和（b）密(mi)相(xiang)輸(shu)(shu)(shu)(shu)送(song)(song)每種(zhong)流(liu)動型(xing)式(shi)可(ke)按(an)物(wu)料(liao)(liao)與空氣(qi)(qi)的(de)(de)(de)(de)(de)(de)流(liu)量(liang)比(bi)率大小分(fen)類，其(qi)比(bi)率也被稱為“固氣(qi)(qi)比(bi)”： μ=ms/mf (1)許(xu)多(duo)(duo)稀(xi)相(xiang)的(de)(de)(de)(de)(de)(de)運行范圍為0＜μ＜15，而(er)密(mi)相(xiang)通(tong)常(chang)(chang)是(shi)(shi)(shi)(shi)μ＞15。圖1所(suo)示的(de)(de)(de)(de)(de)(de)是(shi)(shi)(shi)(shi)典型(xing)輸(shu)(shu)(shu)(shu)送(song)(song)狀態圖。稀(xi)相(xiang)輸(shu)(shu)(shu)(shu)送(song)(song)可(ke)以被認(ren)為是(shi)(shi)(shi)(shi)一(yi)種(zhong)完全(quan)的(de)(de)(de)(de)(de)(de)懸浮(fu)流(liu)，而(er)密(mi)相(xiang)輸(shu)(shu)(shu)(shu)送(song)(song)通(tong)常(chang)(chang)被認(ren)為是(shi)(shi)(shi)(shi)非(fei)懸浮(fu)流(liu)。然而(er)，如圖1所(suo)示，許(xu)多(duo)(duo)不同(tong)(tong)種(zhong)類的(de)(de)(de)(de)(de)(de)密(mi)相(xiang)（非(fei)懸浮(fu)流(liu)）依靠散料(liao)(liao)的(de)(de)(de)(de)(de)(de)料(liao)(liao)性和流(liu)動性存在。密(mi)相(xiang)輸(shu)(shu)(shu)(shu)送(song)(song)同(tong)(tong)樣也能(neng)被定義為輸(shu)(shu)(shu)(shu)送(song)(song)物(wu)料(liao)(liao)完全(quan)填滿管(guan)道(dao)截面(mian)的(de)(de)(de)(de)(de)(de)一(yi)種(zhong)輸(shu)(shu)(shu)(shu)送(song)(song)方式(shi)。稀(xi)相(xiang)輸(shu)(shu)(shu)(shu)送(song)(song)通(tong)常(chang)(chang)需要(yao)使用大量(liang)的(de)(de)(de)(de)(de)(de)高速氣(qi)(qi)體。氣(qi)(qi)流(liu)依靠升力和推動力以離散粒(li)子(zi)的(de)(de)(de)(de)(de)(de)形式(shi)攜帶著物(wu)料(liao)(liao)。參考(kao)圖1中(zhong)(zhong)所(suo)述(shu)的(de)(de)(de)(de)(de)(de)“懸浮(fu)流(liu)”，稀(xi)相(xiang)系(xi)統(tong)(tong)通(tong)常(chang)(chang)是(shi)(shi)(shi)(shi)最(zui)為被廣泛(fan)應(ying)用的(de)(de)(de)(de)(de)(de)氣(qi)(qi)力輸(shu)(shu)(shu)(shu)送(song)(song)系(xi)統(tong)(tong)。由于(yu)(yu)稀(xi)相(xiang)系(xi)統(tong)(tong)設計的(de)(de)(de)(de)(de)(de)相(xiang)對簡(jian)單性，它們(men)同(tong)(tong)時(shi)也被頻繁(fan)的(de)(de)(de)(de)(de)(de)應(ying)用在工業(ye)領域。輸(shu)(shu)(shu)(shu)送(song)(song)氣(qi)(qi)體的(de)(de)(de)(de)(de)(de)速度減少(shao)到(dao)比(bi)保持(chi)粒(li)子(zi)懸浮(fu)狀態的(de)(de)(de)(de)(de)(de)臨界(jie)值更小時(shi)，導(dao)致物(wu)料(liao)(liao)在輸(shu)(shu)(shu)(shu)送(song)(song)管(guan)道(dao)的(de)(de)(de)(de)(de)(de)橫截面(mian)形成不均勻的(de)(de)(de)(de)(de)(de)分(fen)布。臨界(jie)氣(qi)(qi)體速度被稱為是(shi)(shi)(shi)(shi)水(shui)平(ping)輸(shu)(shu)(shu)(shu)送(song)(song)的(de)(de)(de)(de)(de)(de)跳躍速度，垂直輸(shu)(shu)(shu)(shu)送(song)(song)時(shi)堵塞。當水(shui)平(ping)管(guan)道(dao)中(zhong)(zhong)的(de)(de)(de)(de)(de)(de)物(wu)料(liao)(liao)表(biao)面(mian)氣(qi)(qi)體速度低于(yu)(yu)突變速度時(shi)，輸(shu)(shu)(shu)(shu)送(song)(song)將(jiang)會以低流(liu)量(liang)通(tong)過管(guan)道(dao)橫截面(mian)的(de)(de)(de)(de)(de)(de)上(shang)部(bu)(bu)(bu)，在管(guan)道(dao)的(de)(de)(de)(de)(de)(de)剩余部(bu)(bu)(bu)分(fen)以高濃度低速度的(de)(de)(de)(de)(de)(de)形式(shi)填充(chong)。有時(shi)沿(yan)管(guan)道(dao)的(de)(de)(de)(de)(de)(de)橫截面(mian)會被填滿，而(er)有時(shi)只是(shi)(shi)(shi)(shi)部(bu)(bu)(bu)分(fen)被填滿.

實(shi)際應(ying)用(yong)中(zhong), 按照氣力驅動形式可以分(fen)為負壓(ya)(ya)和正壓(ya)(ya)氣力輸(shu)(shu)(shu)送(song), 在這(zhe)兩(liang)種輸(shu)(shu)(shu)送(song)系統中(zhong), 根(gen)據(ju)流動狀態(tai)(tai)圖(tu)再區分(fen)分(fen)為稀相(xiang)(xiang), 密相(xiang)(xiang)和流化態(tai)(tai)輸(shu)(shu)(shu)送(song)系統. 除此之外(wai),根(gen)據(ju)喂(wei)料不同分(fen)為連續和批次輸(shu)(shu)(shu)送(song). 在高壓(ya)(ya)密相(xiang)(xiang)輸(shu)(shu)(shu)送(song)技術中(zhong)常(chang)采(cai)用(yong)批次的壓(ya)(ya)力罐進(jin)行高壓(ya)(ya)輸(shu)(shu)(shu)送(song), 同時(shi), 可以組(zu)合兩(liang)個壓(ya)(ya)力罐設計達到連續的輸(shu)(shu)(shu)送(song).

密相氣力輸送特點:

● 用氣量小(xiao), 節能

● 無殘留輸(shu)送

● 不堵塞, 運行(xing)可靠

● 維護費用低

● 適合于各類粉粒(li)物料

● 壓力(li)至(zhi)0. 6m p a可調

● 適合于柔性(xing)化自(zi)動生產中的物料(liao)高效輸(shu)送