密相气力输送系(xi)列(lie)

气力(li)输送原理

气(qi)力(li)输(shu)(shu)(shu)送(song)(song)系(xi)统(tong)(tong)可分类为(wei)(wei)(wei)不(bu)同(tong)(tong)的(de)(de)(de)(de)(de)(de)流(liu)(liu)(liu)动(dong)(dong)型式，其中(zhong)两种(zhong)(zhong)主要型式是(shi)：(a) 稀相(xiang)(xiang)(xiang)输(shu)(shu)(shu)送(song)(song)和（b）密(mi)相(xiang)(xiang)(xiang)输(shu)(shu)(shu)送(song)(song)每种(zhong)(zhong)流(liu)(liu)(liu)动(dong)(dong)型式可按物(wu)(wu)料(liao)与空气(qi)的(de)(de)(de)(de)(de)(de)流(liu)(liu)(liu)量(liang)比(bi)(bi)(bi)率大小分类，其比(bi)(bi)(bi)率也被(bei)(bei)称为(wei)(wei)(wei)“固气(qi)比(bi)(bi)(bi)”： μ=ms/mf (1)许多稀相(xiang)(xiang)(xiang)的(de)(de)(de)(de)(de)(de)运行范围为(wei)(wei)(wei)0＜μ＜15，而(er)(er)密(mi)相(xiang)(xiang)(xiang)通(tong)常是(shi)μ＞15。图(tu)1所(suo)示(shi)的(de)(de)(de)(de)(de)(de)是(shi)典(dian)型输(shu)(shu)(shu)送(song)(song)状(zhuang)态图(tu)。稀相(xiang)(xiang)(xiang)输(shu)(shu)(shu)送(song)(song)可以(yi)被(bei)(bei)认(ren)为(wei)(wei)(wei)是(shi)一种(zhong)(zhong)完全的(de)(de)(de)(de)(de)(de)悬浮流(liu)(liu)(liu)，而(er)(er)密(mi)相(xiang)(xiang)(xiang)输(shu)(shu)(shu)送(song)(song)通(tong)常被(bei)(bei)认(ren)为(wei)(wei)(wei)是(shi)非悬浮流(liu)(liu)(liu)。然(ran)而(er)(er)，如图(tu)1所(suo)示(shi)，许多不(bu)同(tong)(tong)种(zhong)(zhong)类的(de)(de)(de)(de)(de)(de)密(mi)相(xiang)(xiang)(xiang)（非悬浮流(liu)(liu)(liu)）依(yi)靠散料(liao)的(de)(de)(de)(de)(de)(de)料(liao)性和流(liu)(liu)(liu)动(dong)(dong)性存在。密(mi)相(xiang)(xiang)(xiang)输(shu)(shu)(shu)送(song)(song)同(tong)(tong)样也能(neng)被(bei)(bei)定义(yi)为(wei)(wei)(wei)输(shu)(shu)(shu)送(song)(song)物(wu)(wu)料(liao)完全填满管道(dao)(dao)截面(mian)(mian)的(de)(de)(de)(de)(de)(de)一种(zhong)(zhong)输(shu)(shu)(shu)送(song)(song)方式。稀相(xiang)(xiang)(xiang)输(shu)(shu)(shu)送(song)(song)通(tong)常需(xu)要使(shi)用大量(liang)的(de)(de)(de)(de)(de)(de)高速(su)气(qi)体(ti)(ti)。气(qi)流(liu)(liu)(liu)依(yi)靠升力(li)和推动(dong)(dong)力(li)以(yi)离散粒子的(de)(de)(de)(de)(de)(de)形(xing)(xing)式携带着物(wu)(wu)料(liao)。参考图(tu)1中(zhong)所(suo)述(shu)的(de)(de)(de)(de)(de)(de)“悬浮流(liu)(liu)(liu)”，稀相(xiang)(xiang)(xiang)系(xi)统(tong)(tong)通(tong)常是(shi)最(zui)为(wei)(wei)(wei)被(bei)(bei)广泛应用的(de)(de)(de)(de)(de)(de)气(qi)力(li)输(shu)(shu)(shu)送(song)(song)系(xi)统(tong)(tong)。由于(yu)(yu)稀相(xiang)(xiang)(xiang)系(xi)统(tong)(tong)设(she)计(ji)的(de)(de)(de)(de)(de)(de)相(xiang)(xiang)(xiang)对简(jian)单(dan)性，它们同(tong)(tong)时(shi)也被(bei)(bei)频繁(fan)的(de)(de)(de)(de)(de)(de)应用在工业领域。输(shu)(shu)(shu)送(song)(song)气(qi)体(ti)(ti)的(de)(de)(de)(de)(de)(de)速(su)度(du)(du)(du)减少到比(bi)(bi)(bi)保(bao)持粒子悬浮状(zhuang)态的(de)(de)(de)(de)(de)(de)临界值更(geng)小时(shi)，导致物(wu)(wu)料(liao)在输(shu)(shu)(shu)送(song)(song)管道(dao)(dao)的(de)(de)(de)(de)(de)(de)横截面(mian)(mian)形(xing)(xing)成不(bu)均匀的(de)(de)(de)(de)(de)(de)分布。临界气(qi)体(ti)(ti)速(su)度(du)(du)(du)被(bei)(bei)称为(wei)(wei)(wei)是(shi)水平输(shu)(shu)(shu)送(song)(song)的(de)(de)(de)(de)(de)(de)跳跃速(su)度(du)(du)(du)，垂(chui)直输(shu)(shu)(shu)送(song)(song)时(shi)堵塞。当水平管道(dao)(dao)中(zhong)的(de)(de)(de)(de)(de)(de)物(wu)(wu)料(liao)表面(mian)(mian)气(qi)体(ti)(ti)速(su)度(du)(du)(du)低于(yu)(yu)突变速(su)度(du)(du)(du)时(shi)，输(shu)(shu)(shu)送(song)(song)将会(hui)以(yi)低流(liu)(liu)(liu)量(liang)通(tong)过管道(dao)(dao)横截面(mian)(mian)的(de)(de)(de)(de)(de)(de)上部，在管道(dao)(dao)的(de)(de)(de)(de)(de)(de)剩余(yu)部分以(yi)高浓度(du)(du)(du)低速(su)度(du)(du)(du)的(de)(de)(de)(de)(de)(de)形(xing)(xing)式填充(chong)。有时(shi)沿管道(dao)(dao)的(de)(de)(de)(de)(de)(de)横截面(mian)(mian)会(hui)被(bei)(bei)填满，而(er)(er)有时(shi)只(zhi)是(shi)部分被(bei)(bei)填满.

实(shi)际应用中(zhong), 按照气(qi)力驱动形式可(ke)以分(fen)(fen)为负压(ya)和正压(ya)气(qi)力输(shu)送(song)(song), 在(zai)这(zhei)两种输(shu)送(song)(song)系统中(zhong), 根(gen)据(ju)流动状(zhuang)态(tai)图再区分(fen)(fen)分(fen)(fen)为稀相, 密相和流化态(tai)输(shu)送(song)(song)系统. 除此之外(wai),根(gen)据(ju)喂料不同分(fen)(fen)为连续和批(pi)次输(shu)送(song)(song). 在(zai)高压(ya)密相输(shu)送(song)(song)技术(shu)中(zhong)常采用批(pi)次的压(ya)力罐进行高压(ya)输(shu)送(song)(song), 同时, 可(ke)以组合两个压(ya)力罐设计达到连续的输(shu)送(song)(song).

密(mi)相气(qi)力输送特点:

● 用(yong)气量小(xiao), 节能(neng)

● 无(wu)残(can)留输送

● 不堵塞(sai), 运行可靠(kao)

● 维护费用低

● 适合于各类粉(fen)粒物料

● 压力至0. 6m p a可调

● 适合于柔性化自(zi)动(dong)生产中的(de)物料(liao)高效输送