密相气力输送系列

气力输送原理(li)

气(qi)(qi)(qi)(qi)(qi)力(li)输(shu)(shu)(shu)送(song)(song)(song)系统(tong)可分(fen)类(lei)为(wei)(wei)(wei)不(bu)同的(de)(de)流(liu)(liu)动型式(shi)，其中两种(zhong)(zhong)主要(yao)型式(shi)是(shi)(shi)：(a) 稀(xi)相(xiang)输(shu)(shu)(shu)送(song)(song)(song)和（b）密(mi)(mi)相(xiang)输(shu)(shu)(shu)送(song)(song)(song)每种(zhong)(zhong)流(liu)(liu)动型式(shi)可按(an)物(wu)料(liao)与(yu)空(kong)气(qi)(qi)(qi)(qi)(qi)的(de)(de)流(liu)(liu)量比率(lv)大(da)小分(fen)类(lei)，其比率(lv)也被(bei)(bei)称(cheng)为(wei)(wei)(wei)“固气(qi)(qi)(qi)(qi)(qi)比”： μ=ms/mf (1)许多稀(xi)相(xiang)的(de)(de)运(yun)行(xing)范围(wei)为(wei)(wei)(wei)0＜μ＜15，而(er)密(mi)(mi)相(xiang)通(tong)常(chang)是(shi)(shi)μ＞15。图1所示的(de)(de)是(shi)(shi)典型输(shu)(shu)(shu)送(song)(song)(song)状(zhuang)态(tai)图。稀(xi)相(xiang)输(shu)(shu)(shu)送(song)(song)(song)可以(yi)(yi)被(bei)(bei)认为(wei)(wei)(wei)是(shi)(shi)一种(zhong)(zhong)完全的(de)(de)悬浮(fu)(fu)流(liu)(liu)，而(er)密(mi)(mi)相(xiang)输(shu)(shu)(shu)送(song)(song)(song)通(tong)常(chang)被(bei)(bei)认为(wei)(wei)(wei)是(shi)(shi)非(fei)悬浮(fu)(fu)流(liu)(liu)。然而(er)，如图1所示，许多不(bu)同种(zhong)(zhong)类(lei)的(de)(de)密(mi)(mi)相(xiang)（非(fei)悬浮(fu)(fu)流(liu)(liu)）依靠(kao)(kao)散(san)料(liao)的(de)(de)料(liao)性和流(liu)(liu)动性存在。密(mi)(mi)相(xiang)输(shu)(shu)(shu)送(song)(song)(song)同样(yang)也能被(bei)(bei)定义为(wei)(wei)(wei)输(shu)(shu)(shu)送(song)(song)(song)物(wu)料(liao)完全填满(man)管(guan)(guan)道(dao)(dao)截(jie)面(mian)(mian)(mian)的(de)(de)一种(zhong)(zhong)输(shu)(shu)(shu)送(song)(song)(song)方式(shi)。稀(xi)相(xiang)输(shu)(shu)(shu)送(song)(song)(song)通(tong)常(chang)需要(yao)使用大(da)量的(de)(de)高速(su)(su)气(qi)(qi)(qi)(qi)(qi)体。气(qi)(qi)(qi)(qi)(qi)流(liu)(liu)依靠(kao)(kao)升力(li)和推(tui)动力(li)以(yi)(yi)离(li)散(san)粒(li)子(zi)的(de)(de)形(xing)(xing)式(shi)携带着(zhe)物(wu)料(liao)。参考图1中所述的(de)(de)“悬浮(fu)(fu)流(liu)(liu)”，稀(xi)相(xiang)系统(tong)通(tong)常(chang)是(shi)(shi)最(zui)为(wei)(wei)(wei)被(bei)(bei)广泛应用的(de)(de)气(qi)(qi)(qi)(qi)(qi)力(li)输(shu)(shu)(shu)送(song)(song)(song)系统(tong)。由于(yu)稀(xi)相(xiang)系统(tong)设计的(de)(de)相(xiang)对简单性，它们同时也被(bei)(bei)频繁的(de)(de)应用在工业领(ling)域。输(shu)(shu)(shu)送(song)(song)(song)气(qi)(qi)(qi)(qi)(qi)体的(de)(de)速(su)(su)度(du)(du)减(jian)少(shao)到比保持粒(li)子(zi)悬浮(fu)(fu)状(zhuang)态(tai)的(de)(de)临界值更小时，导(dao)致物(wu)料(liao)在输(shu)(shu)(shu)送(song)(song)(song)管(guan)(guan)道(dao)(dao)的(de)(de)横(heng)截(jie)面(mian)(mian)(mian)形(xing)(xing)成不(bu)均匀(yun)的(de)(de)分(fen)布。临界气(qi)(qi)(qi)(qi)(qi)体速(su)(su)度(du)(du)被(bei)(bei)称(cheng)为(wei)(wei)(wei)是(shi)(shi)水平输(shu)(shu)(shu)送(song)(song)(song)的(de)(de)跳跃速(su)(su)度(du)(du)，垂直输(shu)(shu)(shu)送(song)(song)(song)时堵塞(sai)。当(dang)水平管(guan)(guan)道(dao)(dao)中的(de)(de)物(wu)料(liao)表面(mian)(mian)(mian)气(qi)(qi)(qi)(qi)(qi)体速(su)(su)度(du)(du)低(di)于(yu)突变速(su)(su)度(du)(du)时，输(shu)(shu)(shu)送(song)(song)(song)将会(hui)以(yi)(yi)低(di)流(liu)(liu)量通(tong)过管(guan)(guan)道(dao)(dao)横(heng)截(jie)面(mian)(mian)(mian)的(de)(de)上(shang)部(bu)，在管(guan)(guan)道(dao)(dao)的(de)(de)剩余部(bu)分(fen)以(yi)(yi)高浓度(du)(du)低(di)速(su)(su)度(du)(du)的(de)(de)形(xing)(xing)式(shi)填充。有时沿管(guan)(guan)道(dao)(dao)的(de)(de)横(heng)截(jie)面(mian)(mian)(mian)会(hui)被(bei)(bei)填满(man)，而(er)有时只(zhi)是(shi)(shi)部(bu)分(fen)被(bei)(bei)填满(man).

实际(ji)应用中, 按照气力(li)驱动形式可以分(fen)为负压(ya)(ya)(ya)和(he)(he)正压(ya)(ya)(ya)气力(li)输送, 在这两种(zhong)输送系(xi)统中, 根据流(liu)(liu)动状态图再区分(fen)分(fen)为稀相, 密相和(he)(he)流(liu)(liu)化态输送系(xi)统. 除此之(zhi)外(wai),根据喂料不(bu)同(tong)分(fen)为连(lian)续和(he)(he)批次输送. 在高(gao)压(ya)(ya)(ya)密相输送技术中常采用批次的压(ya)(ya)(ya)力(li)罐进(jin)行高(gao)压(ya)(ya)(ya)输送, 同(tong)时, 可以组合两个压(ya)(ya)(ya)力(li)罐设计达到连(lian)续的输送.

密(mi)相气力输送特点:

● 用(yong)气量小, 节(jie)能

● 无残留输送

● 不堵塞, 运行可(ke)靠

● 维护费用低

● 适(shi)合于各类粉粒物料(liao)

● 压力至0. 6m p a可调

● 适合于(yu)柔性化(hua)自动生产中的物料高效输(shu)送(song)