密相气力输(shu)送系(xi)列

气力输送原理

气(qi)力输(shu)(shu)(shu)送(song)(song)(song)系(xi)(xi)统(tong)可分类为(wei)(wei)(wei)不(bu)同的(de)(de)(de)(de)(de)(de)流(liu)(liu)(liu)(liu)动(dong)型(xing)(xing)式(shi)(shi)，其中(zhong)两种(zhong)主要型(xing)(xing)式(shi)(shi)是(shi)：(a) 稀(xi)(xi)相(xiang)(xiang)(xiang)输(shu)(shu)(shu)送(song)(song)(song)和(he)（b）密(mi)相(xiang)(xiang)(xiang)输(shu)(shu)(shu)送(song)(song)(song)每(mei)种(zhong)流(liu)(liu)(liu)(liu)动(dong)型(xing)(xing)式(shi)(shi)可按物(wu)料(liao)(liao)(liao)与空气(qi)的(de)(de)(de)(de)(de)(de)流(liu)(liu)(liu)(liu)量比率大(da)小分类，其比率也被称为(wei)(wei)(wei)“固气(qi)比”： μ=ms/mf (1)许(xu)多稀(xi)(xi)相(xiang)(xiang)(xiang)的(de)(de)(de)(de)(de)(de)运行范围为(wei)(wei)(wei)0＜μ＜15，而密(mi)相(xiang)(xiang)(xiang)通(tong)常(chang)是(shi)μ＞15。图(tu)1所(suo)示的(de)(de)(de)(de)(de)(de)是(shi)典型(xing)(xing)输(shu)(shu)(shu)送(song)(song)(song)状态图(tu)。稀(xi)(xi)相(xiang)(xiang)(xiang)输(shu)(shu)(shu)送(song)(song)(song)可以(yi)(yi)被认为(wei)(wei)(wei)是(shi)一种(zhong)完(wan)全的(de)(de)(de)(de)(de)(de)悬(xuan)浮(fu)流(liu)(liu)(liu)(liu)，而密(mi)相(xiang)(xiang)(xiang)输(shu)(shu)(shu)送(song)(song)(song)通(tong)常(chang)被认为(wei)(wei)(wei)是(shi)非悬(xuan)浮(fu)流(liu)(liu)(liu)(liu)。然(ran)而，如(ru)图(tu)1所(suo)示，许(xu)多不(bu)同种(zhong)类的(de)(de)(de)(de)(de)(de)密(mi)相(xiang)(xiang)(xiang)（非悬(xuan)浮(fu)流(liu)(liu)(liu)(liu)）依靠散(san)(san)料(liao)(liao)(liao)的(de)(de)(de)(de)(de)(de)料(liao)(liao)(liao)性和(he)流(liu)(liu)(liu)(liu)动(dong)性存在(zai)。密(mi)相(xiang)(xiang)(xiang)输(shu)(shu)(shu)送(song)(song)(song)同样也能被定义为(wei)(wei)(wei)输(shu)(shu)(shu)送(song)(song)(song)物(wu)料(liao)(liao)(liao)完(wan)全填(tian)满(man)管(guan)道截面(mian)的(de)(de)(de)(de)(de)(de)一种(zhong)输(shu)(shu)(shu)送(song)(song)(song)方式(shi)(shi)。稀(xi)(xi)相(xiang)(xiang)(xiang)输(shu)(shu)(shu)送(song)(song)(song)通(tong)常(chang)需要使用大(da)量的(de)(de)(de)(de)(de)(de)高(gao)速(su)(su)气(qi)体(ti)。气(qi)流(liu)(liu)(liu)(liu)依靠升力和(he)推动(dong)力以(yi)(yi)离散(san)(san)粒(li)子的(de)(de)(de)(de)(de)(de)形(xing)式(shi)(shi)携(xie)带着物(wu)料(liao)(liao)(liao)。参(can)考图(tu)1中(zhong)所(suo)述(shu)的(de)(de)(de)(de)(de)(de)“悬(xuan)浮(fu)流(liu)(liu)(liu)(liu)”，稀(xi)(xi)相(xiang)(xiang)(xiang)系(xi)(xi)统(tong)通(tong)常(chang)是(shi)最(zui)为(wei)(wei)(wei)被广泛应用的(de)(de)(de)(de)(de)(de)气(qi)力输(shu)(shu)(shu)送(song)(song)(song)系(xi)(xi)统(tong)。由于稀(xi)(xi)相(xiang)(xiang)(xiang)系(xi)(xi)统(tong)设计的(de)(de)(de)(de)(de)(de)相(xiang)(xiang)(xiang)对(dui)简(jian)单性，它们(men)同时(shi)也被频繁的(de)(de)(de)(de)(de)(de)应用在(zai)工业领域(yu)。输(shu)(shu)(shu)送(song)(song)(song)气(qi)体(ti)的(de)(de)(de)(de)(de)(de)速(su)(su)度(du)(du)(du)(du)减少到比保持粒(li)子悬(xuan)浮(fu)状态的(de)(de)(de)(de)(de)(de)临界值(zhi)更小时(shi)，导致物(wu)料(liao)(liao)(liao)在(zai)输(shu)(shu)(shu)送(song)(song)(song)管(guan)道的(de)(de)(de)(de)(de)(de)横(heng)截面(mian)形(xing)成不(bu)均匀的(de)(de)(de)(de)(de)(de)分布(bu)。临界气(qi)体(ti)速(su)(su)度(du)(du)(du)(du)被称为(wei)(wei)(wei)是(shi)水(shui)平输(shu)(shu)(shu)送(song)(song)(song)的(de)(de)(de)(de)(de)(de)跳跃速(su)(su)度(du)(du)(du)(du)，垂直输(shu)(shu)(shu)送(song)(song)(song)时(shi)堵塞。当水(shui)平管(guan)道中(zhong)的(de)(de)(de)(de)(de)(de)物(wu)料(liao)(liao)(liao)表面(mian)气(qi)体(ti)速(su)(su)度(du)(du)(du)(du)低于突(tu)变(bian)速(su)(su)度(du)(du)(du)(du)时(shi)，输(shu)(shu)(shu)送(song)(song)(song)将会以(yi)(yi)低流(liu)(liu)(liu)(liu)量通(tong)过管(guan)道横(heng)截面(mian)的(de)(de)(de)(de)(de)(de)上(shang)部(bu)，在(zai)管(guan)道的(de)(de)(de)(de)(de)(de)剩(sheng)余部(bu)分以(yi)(yi)高(gao)浓度(du)(du)(du)(du)低速(su)(su)度(du)(du)(du)(du)的(de)(de)(de)(de)(de)(de)形(xing)式(shi)(shi)填(tian)充。有(you)时(shi)沿(yan)管(guan)道的(de)(de)(de)(de)(de)(de)横(heng)截面(mian)会被填(tian)满(man)，而有(you)时(shi)只(zhi)是(shi)部(bu)分被填(tian)满(man).

实(shi)际应用(yong)中, 按照气力(li)驱动形(xing)式可(ke)以分(fen)为(wei)负(fu)压和正压气力(li)输(shu)送, 在这两(liang)(liang)种输(shu)送系统(tong)(tong)中, 根(gen)据(ju)流(liu)动状态图再区分(fen)分(fen)为(wei)稀(xi)相, 密相和流(liu)化态输(shu)送系统(tong)(tong). 除此之(zhi)外,根(gen)据(ju)喂料不(bu)同(tong)分(fen)为(wei)连(lian)(lian)续和批(pi)次(ci)输(shu)送. 在高(gao)压密相输(shu)送技术中常采用(yong)批(pi)次(ci)的压力(li)罐进行高(gao)压输(shu)送, 同(tong)时, 可(ke)以组合两(liang)(liang)个压力(li)罐设计达到(dao)连(lian)(lian)续的输(shu)送.

密相气力输(shu)送特点:

● 用气量小(xiao), 节能(neng)

● 无残留输送

● 不(bu)堵塞, 运行可靠

● 维护费用低

● 适合于(yu)各类粉粒物料(liao)

● 压力(li)至(zhi)0. 6m p a可(ke)调

● 适合于柔性(xing)化自(zi)动生产中的物料(liao)高效输送