密相气力输送系列

气力输送原理

气(qi)(qi)(qi)力(li)输送(song)(song)(song)系(xi)统可分类(lei)为不同的(de)(de)(de)(de)(de)(de)流(liu)(liu)(liu)动型(xing)式(shi)，其(qi)中(zhong)两(liang)种(zhong)(zhong)主要(yao)(yao)型(xing)式(shi)是(shi)(shi)：(a) 稀相输送(song)(song)(song)和(he)（b）密(mi)相输送(song)(song)(song)每种(zhong)(zhong)流(liu)(liu)(liu)动型(xing)式(shi)可按物(wu)(wu)料与(yu)空(kong)气(qi)(qi)(qi)的(de)(de)(de)(de)(de)(de)流(liu)(liu)(liu)量(liang)比(bi)率(lv)大(da)小(xiao)分类(lei)，其(qi)比(bi)率(lv)也(ye)(ye)被(bei)(bei)称为“固气(qi)(qi)(qi)比(bi)”： μ=ms/mf (1)许多稀相的(de)(de)(de)(de)(de)(de)运行范围为0＜μ＜15，而(er)密(mi)相通常(chang)是(shi)(shi)μ＞15。图(tu)(tu)(tu)(tu)1所(suo)示的(de)(de)(de)(de)(de)(de)是(shi)(shi)典型(xing)输送(song)(song)(song)状(zhuang)态(tai)图(tu)(tu)(tu)(tu)。稀相输送(song)(song)(song)可以(yi)被(bei)(bei)认为是(shi)(shi)一(yi)种(zhong)(zhong)完(wan)(wan)全的(de)(de)(de)(de)(de)(de)悬浮(fu)(fu)流(liu)(liu)(liu)，而(er)密(mi)相输送(song)(song)(song)通常(chang)被(bei)(bei)认为是(shi)(shi)非悬浮(fu)(fu)流(liu)(liu)(liu)。然而(er)，如图(tu)(tu)(tu)(tu)1所(suo)示，许多不同种(zhong)(zhong)类(lei)的(de)(de)(de)(de)(de)(de)密(mi)相（非悬浮(fu)(fu)流(liu)(liu)(liu)）依(yi)(yi)靠散料的(de)(de)(de)(de)(de)(de)料性和(he)流(liu)(liu)(liu)动性存在。密(mi)相输送(song)(song)(song)同样也(ye)(ye)能被(bei)(bei)定义为输送(song)(song)(song)物(wu)(wu)料完(wan)(wan)全填(tian)满(man)管(guan)道(dao)(dao)截面(mian)的(de)(de)(de)(de)(de)(de)一(yi)种(zhong)(zhong)输送(song)(song)(song)方(fang)式(shi)。稀相输送(song)(song)(song)通常(chang)需要(yao)(yao)使(shi)用大(da)量(liang)的(de)(de)(de)(de)(de)(de)高速气(qi)(qi)(qi)体。气(qi)(qi)(qi)流(liu)(liu)(liu)依(yi)(yi)靠升(sheng)力(li)和(he)推(tui)动力(li)以(yi)离散粒子(zi)(zi)的(de)(de)(de)(de)(de)(de)形式(shi)携(xie)带着物(wu)(wu)料。参(can)考图(tu)(tu)(tu)(tu)1中(zhong)所(suo)述的(de)(de)(de)(de)(de)(de)“悬浮(fu)(fu)流(liu)(liu)(liu)”，稀相系(xi)统通常(chang)是(shi)(shi)最为被(bei)(bei)广泛应用的(de)(de)(de)(de)(de)(de)气(qi)(qi)(qi)力(li)输送(song)(song)(song)系(xi)统。由(you)于(yu)稀相系(xi)统设计(ji)的(de)(de)(de)(de)(de)(de)相对(dui)简(jian)单性，它们同时(shi)(shi)也(ye)(ye)被(bei)(bei)频(pin)繁的(de)(de)(de)(de)(de)(de)应用在工业(ye)领(ling)域。输送(song)(song)(song)气(qi)(qi)(qi)体的(de)(de)(de)(de)(de)(de)速度(du)减少到比(bi)保持粒子(zi)(zi)悬浮(fu)(fu)状(zhuang)态(tai)的(de)(de)(de)(de)(de)(de)临界值更小(xiao)时(shi)(shi)，导(dao)致物(wu)(wu)料在输送(song)(song)(song)管(guan)道(dao)(dao)的(de)(de)(de)(de)(de)(de)横截面(mian)形成不均匀的(de)(de)(de)(de)(de)(de)分布。临界气(qi)(qi)(qi)体速度(du)被(bei)(bei)称为是(shi)(shi)水平输送(song)(song)(song)的(de)(de)(de)(de)(de)(de)跳跃速度(du)，垂直(zhi)输送(song)(song)(song)时(shi)(shi)堵塞。当水平管(guan)道(dao)(dao)中(zhong)的(de)(de)(de)(de)(de)(de)物(wu)(wu)料表(biao)面(mian)气(qi)(qi)(qi)体速度(du)低(di)于(yu)突(tu)变(bian)速度(du)时(shi)(shi)，输送(song)(song)(song)将会以(yi)低(di)流(liu)(liu)(liu)量(liang)通过管(guan)道(dao)(dao)横截面(mian)的(de)(de)(de)(de)(de)(de)上(shang)部，在管(guan)道(dao)(dao)的(de)(de)(de)(de)(de)(de)剩余(yu)部分以(yi)高浓(nong)度(du)低(di)速度(du)的(de)(de)(de)(de)(de)(de)形式(shi)填(tian)充(chong)。有(you)(you)时(shi)(shi)沿管(guan)道(dao)(dao)的(de)(de)(de)(de)(de)(de)横截面(mian)会被(bei)(bei)填(tian)满(man)，而(er)有(you)(you)时(shi)(shi)只(zhi)是(shi)(shi)部分被(bei)(bei)填(tian)满(man).

实际应用中(zhong), 按(an)照气(qi)力驱动形式可以(yi)分(fen)为(wei)负压和(he)正(zheng)压气(qi)力输(shu)送(song), 在这(zhei)两(liang)种输(shu)送(song)系(xi)统中(zhong), 根据流(liu)动状态图(tu)再区分(fen)分(fen)为(wei)稀相, 密相和(he)流(liu)化态输(shu)送(song)系(xi)统. 除此之外(wai),根据喂(wei)料不同分(fen)为(wei)连续(xu)和(he)批次(ci)输(shu)送(song). 在高压密相输(shu)送(song)技术中(zhong)常采(cai)用批次(ci)的(de)压力罐进行高压输(shu)送(song), 同时, 可以(yi)组合(he)两(liang)个压力罐设(she)计达(da)到连续(xu)的(de)输(shu)送(song).

密(mi)相气力输送特点:

● 用气量小, 节能

● 无残留输送

● 不(bu)堵(du)塞, 运行可靠

● 维护费用低

● 适合于各类(lei)粉粒(li)物料(liao)

● 压力(li)至0. 6m p a可(ke)调

● 适合(he)于柔性化自动生产中的(de)物料高效输送