密相气(qi)力(li)输送系列

气(qi)力(li)输送原理

气(qi)力输(shu)(shu)(shu)送(song)(song)(song)系(xi)(xi)统可分(fen)类(lei)为(wei)(wei)不同(tong)(tong)的(de)(de)(de)(de)(de)流(liu)(liu)(liu)动(dong)(dong)型(xing)(xing)式(shi)，其中两种(zhong)主(zhu)要型(xing)(xing)式(shi)是：(a) 稀(xi)相(xiang)(xiang)(xiang)(xiang)输(shu)(shu)(shu)送(song)(song)(song)和(he)（b）密相(xiang)(xiang)(xiang)(xiang)输(shu)(shu)(shu)送(song)(song)(song)每种(zhong)流(liu)(liu)(liu)动(dong)(dong)型(xing)(xing)式(shi)可按物(wu)(wu)(wu)料与(yu)空气(qi)的(de)(de)(de)(de)(de)流(liu)(liu)(liu)量比(bi)率(lv)大小(xiao)分(fen)类(lei)，其比(bi)率(lv)也被(bei)称为(wei)(wei)“固气(qi)比(bi)”： μ=ms/mf (1)许多(duo)稀(xi)相(xiang)(xiang)(xiang)(xiang)的(de)(de)(de)(de)(de)运行范(fan)围为(wei)(wei)0＜μ＜15，而密相(xiang)(xiang)(xiang)(xiang)通(tong)(tong)常是μ＞15。图1所示的(de)(de)(de)(de)(de)是典型(xing)(xing)输(shu)(shu)(shu)送(song)(song)(song)状态(tai)(tai)图。稀(xi)相(xiang)(xiang)(xiang)(xiang)输(shu)(shu)(shu)送(song)(song)(song)可以被(bei)认为(wei)(wei)是一种(zhong)完全(quan)的(de)(de)(de)(de)(de)悬(xuan)浮流(liu)(liu)(liu)，而密相(xiang)(xiang)(xiang)(xiang)输(shu)(shu)(shu)送(song)(song)(song)通(tong)(tong)常被(bei)认为(wei)(wei)是非悬(xuan)浮流(liu)(liu)(liu)。然而，如图1所示，许多(duo)不同(tong)(tong)种(zhong)类(lei)的(de)(de)(de)(de)(de)密相(xiang)(xiang)(xiang)(xiang)（非悬(xuan)浮流(liu)(liu)(liu)）依靠(kao)散料的(de)(de)(de)(de)(de)料性和(he)流(liu)(liu)(liu)动(dong)(dong)性存在(zai)。密相(xiang)(xiang)(xiang)(xiang)输(shu)(shu)(shu)送(song)(song)(song)同(tong)(tong)样也能被(bei)定义为(wei)(wei)输(shu)(shu)(shu)送(song)(song)(song)物(wu)(wu)(wu)料完全(quan)填满管道(dao)(dao)截(jie)面(mian)(mian)的(de)(de)(de)(de)(de)一种(zhong)输(shu)(shu)(shu)送(song)(song)(song)方式(shi)。稀(xi)相(xiang)(xiang)(xiang)(xiang)输(shu)(shu)(shu)送(song)(song)(song)通(tong)(tong)常需要使用大量的(de)(de)(de)(de)(de)高速气(qi)体(ti)(ti)。气(qi)流(liu)(liu)(liu)依靠(kao)升力和(he)推(tui)动(dong)(dong)力以离(li)散粒子(zi)的(de)(de)(de)(de)(de)形(xing)式(shi)携带着物(wu)(wu)(wu)料。参考图1中所述的(de)(de)(de)(de)(de)“悬(xuan)浮流(liu)(liu)(liu)”，稀(xi)相(xiang)(xiang)(xiang)(xiang)系(xi)(xi)统通(tong)(tong)常是最为(wei)(wei)被(bei)广泛(fan)应用的(de)(de)(de)(de)(de)气(qi)力输(shu)(shu)(shu)送(song)(song)(song)系(xi)(xi)统。由于稀(xi)相(xiang)(xiang)(xiang)(xiang)系(xi)(xi)统设计的(de)(de)(de)(de)(de)相(xiang)(xiang)(xiang)(xiang)对简单(dan)性，它们同(tong)(tong)时(shi)(shi)也被(bei)频(pin)繁的(de)(de)(de)(de)(de)应用在(zai)工业领域。输(shu)(shu)(shu)送(song)(song)(song)气(qi)体(ti)(ti)的(de)(de)(de)(de)(de)速度(du)减(jian)少到比(bi)保持粒子(zi)悬(xuan)浮状态(tai)(tai)的(de)(de)(de)(de)(de)临界值更小(xiao)时(shi)(shi)，导致(zhi)物(wu)(wu)(wu)料在(zai)输(shu)(shu)(shu)送(song)(song)(song)管道(dao)(dao)的(de)(de)(de)(de)(de)横截(jie)面(mian)(mian)形(xing)成不均匀的(de)(de)(de)(de)(de)分(fen)布。临界气(qi)体(ti)(ti)速度(du)被(bei)称为(wei)(wei)是水平(ping)输(shu)(shu)(shu)送(song)(song)(song)的(de)(de)(de)(de)(de)跳(tiao)跃速度(du)，垂直(zhi)输(shu)(shu)(shu)送(song)(song)(song)时(shi)(shi)堵塞。当水平(ping)管道(dao)(dao)中的(de)(de)(de)(de)(de)物(wu)(wu)(wu)料表面(mian)(mian)气(qi)体(ti)(ti)速度(du)低于突变速度(du)时(shi)(shi)，输(shu)(shu)(shu)送(song)(song)(song)将(jiang)会以低流(liu)(liu)(liu)量通(tong)(tong)过管道(dao)(dao)横截(jie)面(mian)(mian)的(de)(de)(de)(de)(de)上部(bu)，在(zai)管道(dao)(dao)的(de)(de)(de)(de)(de)剩(sheng)余(yu)部(bu)分(fen)以高浓度(du)低速度(du)的(de)(de)(de)(de)(de)形(xing)式(shi)填充。有(you)时(shi)(shi)沿管道(dao)(dao)的(de)(de)(de)(de)(de)横截(jie)面(mian)(mian)会被(bei)填满，而有(you)时(shi)(shi)只是部(bu)分(fen)被(bei)填满.

实(shi)际应用中(zhong), 按照气力(li)(li)驱动形式可以分为负(fu)压和(he)正压气力(li)(li)输(shu)送(song), 在这两(liang)种输(shu)送(song)系统中(zhong), 根据流动状态(tai)(tai)图再(zai)区分分为稀相, 密(mi)(mi)相和(he)流化(hua)态(tai)(tai)输(shu)送(song)系统. 除此(ci)之外,根据喂料不同(tong)分为连续(xu)和(he)批(pi)次输(shu)送(song). 在高压密(mi)(mi)相输(shu)送(song)技术中(zhong)常采用批(pi)次的压力(li)(li)罐进行高压输(shu)送(song), 同(tong)时, 可以组合(he)两(liang)个压力(li)(li)罐设计达到连续(xu)的输(shu)送(song).

密(mi)相气力输送特点:

● 用气量(liang)小, 节能

● 无残留(liu)输送

● 不堵塞, 运行(xing)可(ke)靠

● 维护费用(yong)低(di)

● 适合于各类粉粒(li)物料

● 压力至0. 6m p a可(ke)调

● 适(shi)合(he)于(yu)柔性化自动生产中的物料高效输送