密相氣力輸送系列

氣力輸送原理(li)

氣(qi)(qi)力輸(shu)(shu)送(song)(song)(song)(song)(song)系(xi)統(tong)可分(fen)(fen)類為(wei)(wei)(wei)不同的(de)(de)(de)(de)流(liu)(liu)(liu)動(dong)型式(shi)，其(qi)中兩(liang)種(zhong)主要(yao)型式(shi)是(shi)(shi)：(a) 稀(xi)相(xiang)輸(shu)(shu)送(song)(song)(song)(song)(song)和（b）密(mi)相(xiang)輸(shu)(shu)送(song)(song)(song)(song)(song)每種(zhong)流(liu)(liu)(liu)動(dong)型式(shi)可按物料(liao)(liao)與空氣(qi)(qi)的(de)(de)(de)(de)流(liu)(liu)(liu)量(liang)比率(lv)(lv)大小分(fen)(fen)類，其(qi)比率(lv)(lv)也被(bei)(bei)(bei)稱為(wei)(wei)(wei)“固氣(qi)(qi)比”： μ=ms/mf (1)許(xu)多(duo)稀(xi)相(xiang)的(de)(de)(de)(de)運行范圍(wei)為(wei)(wei)(wei)0＜μ＜15，而(er)(er)密(mi)相(xiang)通(tong)常(chang)是(shi)(shi)μ＞15。圖(tu)(tu)1所(suo)示的(de)(de)(de)(de)是(shi)(shi)典型輸(shu)(shu)送(song)(song)(song)(song)(song)狀態圖(tu)(tu)。稀(xi)相(xiang)輸(shu)(shu)送(song)(song)(song)(song)(song)可以(yi)被(bei)(bei)(bei)認為(wei)(wei)(wei)是(shi)(shi)一(yi)種(zhong)完全的(de)(de)(de)(de)懸(xuan)浮流(liu)(liu)(liu)，而(er)(er)密(mi)相(xiang)輸(shu)(shu)送(song)(song)(song)(song)(song)通(tong)常(chang)被(bei)(bei)(bei)認為(wei)(wei)(wei)是(shi)(shi)非懸(xuan)浮流(liu)(liu)(liu)。然而(er)(er)，如(ru)圖(tu)(tu)1所(suo)示，許(xu)多(duo)不同種(zhong)類的(de)(de)(de)(de)密(mi)相(xiang)（非懸(xuan)浮流(liu)(liu)(liu)）依靠散(san)料(liao)(liao)的(de)(de)(de)(de)料(liao)(liao)性和流(liu)(liu)(liu)動(dong)性存在。密(mi)相(xiang)輸(shu)(shu)送(song)(song)(song)(song)(song)同樣也能被(bei)(bei)(bei)定義為(wei)(wei)(wei)輸(shu)(shu)送(song)(song)(song)(song)(song)物料(liao)(liao)完全填(tian)滿管(guan)道(dao)截(jie)(jie)面的(de)(de)(de)(de)一(yi)種(zhong)輸(shu)(shu)送(song)(song)(song)(song)(song)方式(shi)。稀(xi)相(xiang)輸(shu)(shu)送(song)(song)(song)(song)(song)通(tong)常(chang)需(xu)要(yao)使用(yong)大量(liang)的(de)(de)(de)(de)高速(su)氣(qi)(qi)體(ti)。氣(qi)(qi)流(liu)(liu)(liu)依靠升力和推動(dong)力以(yi)離散(san)粒(li)子(zi)(zi)的(de)(de)(de)(de)形式(shi)攜(xie)帶著物料(liao)(liao)。參考(kao)圖(tu)(tu)1中所(suo)述的(de)(de)(de)(de)“懸(xuan)浮流(liu)(liu)(liu)”，稀(xi)相(xiang)系(xi)統(tong)通(tong)常(chang)是(shi)(shi)最為(wei)(wei)(wei)被(bei)(bei)(bei)廣泛應用(yong)的(de)(de)(de)(de)氣(qi)(qi)力輸(shu)(shu)送(song)(song)(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)對簡單性，它(ta)們同時(shi)也被(bei)(bei)(bei)頻繁(fan)的(de)(de)(de)(de)應用(yong)在工業領域。輸(shu)(shu)送(song)(song)(song)(song)(song)氣(qi)(qi)體(ti)的(de)(de)(de)(de)速(su)度減少到比保持(chi)粒(li)子(zi)(zi)懸(xuan)浮狀態的(de)(de)(de)(de)臨界(jie)值更小時(shi)，導(dao)致物料(liao)(liao)在輸(shu)(shu)送(song)(song)(song)(song)(song)管(guan)道(dao)的(de)(de)(de)(de)橫截(jie)(jie)面形成不均勻的(de)(de)(de)(de)分(fen)(fen)布。臨界(jie)氣(qi)(qi)體(ti)速(su)度被(bei)(bei)(bei)稱為(wei)(wei)(wei)是(shi)(shi)水(shui)平輸(shu)(shu)送(song)(song)(song)(song)(song)的(de)(de)(de)(de)跳躍速(su)度，垂直(zhi)輸(shu)(shu)送(song)(song)(song)(song)(song)時(shi)堵(du)塞。當水(shui)平管(guan)道(dao)中的(de)(de)(de)(de)物料(liao)(liao)表面氣(qi)(qi)體(ti)速(su)度低(di)于突變(bian)速(su)度時(shi)，輸(shu)(shu)送(song)(song)(song)(song)(song)將會以(yi)低(di)流(liu)(liu)(liu)量(liang)通(tong)過(guo)管(guan)道(dao)橫截(jie)(jie)面的(de)(de)(de)(de)上部，在管(guan)道(dao)的(de)(de)(de)(de)剩余部分(fen)(fen)以(yi)高濃度低(di)速(su)度的(de)(de)(de)(de)形式(shi)填(tian)充。有時(shi)沿管(guan)道(dao)的(de)(de)(de)(de)橫截(jie)(jie)面會被(bei)(bei)(bei)填(tian)滿，而(er)(er)有時(shi)只是(shi)(shi)部分(fen)(fen)被(bei)(bei)(bei)填(tian)滿.

實際(ji)應用中(zhong), 按(an)照氣力(li)(li)驅動(dong)形式可以(yi)分為(wei)(wei)負壓和(he)正(zheng)壓氣力(li)(li)輸送(song), 在這兩種輸送(song)系統中(zhong), 根據(ju)流動(dong)狀(zhuang)態(tai)圖(tu)再(zai)區分分為(wei)(wei)稀(xi)相, 密(mi)相和(he)流化態(tai)輸送(song)系統. 除此(ci)之外,根據(ju)喂料不同分為(wei)(wei)連續(xu)和(he)批(pi)次(ci)(ci)輸送(song). 在高壓密(mi)相輸送(song)技術中(zhong)常采用批(pi)次(ci)(ci)的(de)壓力(li)(li)罐進行(xing)高壓輸送(song), 同時, 可以(yi)組合兩個壓力(li)(li)罐設(she)計達到連續(xu)的(de)輸送(song).

密相氣力輸送特點:

● 用氣量(liang)小, 節能(neng)

● 無殘留輸送

● 不堵塞, 運行可靠

● 維護費用低

● 適合于(yu)各類粉粒物(wu)料

● 壓力至0. 6m p a可調

● 適合于柔(rou)性化(hua)自動生產中的物料高效輸送