密(mi)相(xiang)輸送(song)(song)是氣(qi)流(liu)輸送(song)(song)固體(ti)(ti)粉粒體(ti)(ti)輸送(song)(song)物料的(de)過程，如果管線中顆(ke)粒流(liu)的(de)密(mi)度接(jie)近于臨界流(liu)化狀態(tai)下(xia)的(de)床(chuang)層密(mi)度，則(ze)稱為密(mi)相(xiang)輸送(song)(song)密(mi)相(xiang)渝送(song)(song)所需要的(de)氣(qi)體(ti)(ti)流(liu)量小，一般單位質量的(de)空氣(qi)所輸送(song)(song)的(de)物料質大。

 稀(xi)相輸(shu)送(song)(song)是即管內高速氣(qi)體將粉狀物料彼此分散(san)、懸浮在氣(qi)流中進行輸(shu)送(song)(song)。它的輸(shu)送(song)(song)距離不長，一般(ban)小于(yu)100米。稀(xi)相輸(shu)送(song)(song)主要(yao)有(you)真(zhen)空吸引式和壓送(song)(song)式兩種。下(xia)面我(wo)們來說(shuo)說(shuo)氣(qi)力輸(shu)送(song)(song)中密(mi)相輸(shu)送(song)(song)與稀(xi)相輸(shu)送(song)(song)區別是什么？ 

密(mi)(mi)相(xiang)(xiang)輸(shu)送(song)是用高(gao)壓氣(qi)體壓送(song)物料，氣(qi)源(yuan)壓力(li)可(ke)高(gao)達0.7MPa，密(mi)(mi)相(xiang)(xiang)輸(shu)送(song)的特點是低風量和高(gao)固氣(qi)比(bi)，物料在(zai)管內呈流化態或柱塞狀運動。輸(shu)送(song)能力(li)大，輸(shu)送(song)距(ju)離長，可(ke)達100～1000m。

 密相輸(shu)(shu)(shu)(shu)送(song)(song)(song)(song)分為發(fa)(fa)送(song)(song)(song)(song)罐(guan)輸(shu)(shu)(shu)(shu)送(song)(song)(song)(song)和(he)旋(xuan)轉閥(fa)輸(shu)(shu)(shu)(shu)送(song)(song)(song)(song)。發(fa)(fa)送(song)(song)(song)(song)罐(guan)輸(shu)(shu)(shu)(shu)送(song)(song)(song)(song)是通過(guo)將發(fa)(fa)送(song)(song)(song)(song)罐(guan)加壓(ya)(ya)至一定壓(ya)(ya)力(li)，采(cai)用(yong)切換(huan)出料閥(fa)及氣(qi)(qi)(qi)刀對物料進(jin)行分配來實(shi)現(xian)輸(shu)(shu)(shu)(shu)送(song)(song)(song)(song)的(de)。這種輸(shu)(shu)(shu)(shu)送(song)(song)(song)(song)氣(qi)(qi)(qi)流(liu)速(su)度較(jiao)(jiao)低(di)而固氣(qi)(qi)(qi)比較(jiao)(jiao)高，輸(shu)(shu)(shu)(shu)送(song)(song)(song)(song)氣(qi)(qi)(qi)壓(ya)(ya)力(li)較(jiao)(jiao)高。輸(shu)(shu)(shu)(shu)送(song)(song)(song)(song)氣(qi)(qi)(qi)體(ti)常采(cai)用(yong)空氣(qi)(qi)(qi)或氮氣(qi)(qi)(qi)，動(dong)力(li)一般由壓(ya)(ya)縮機提供(gong)。主(zhu)要(yao)特(te)點為輸(shu)(shu)(shu)(shu)送(song)(song)(song)(song)速(su)度低(di)，對物料品質(zhi)影(ying)響較(jiao)(jiao)小。旋(xuan)轉閥(fa)密相輸(shu)(shu)(shu)(shu)送(song)(song)(song)(song)是采(cai)用(yong)稀相正壓(ya)(ya)輸(shu)(shu)(shu)(shu)送(song)(song)(song)(song)方式(shi)，而動(dong)力(li)采(cai)用(yong)壓(ya)(ya)縮機提供(gong)。系統具(ju)有較(jiao)(jiao)高壓(ya)(ya)力(li)、較(jiao)(jiao)低(di)流(liu)速(su)但輸(shu)(shu)(shu)(shu)送(song)(song)(song)(song)能(neng)力(li)大(da)，對物料幾乎無影(ying)響。