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你应当晓得喷雾枯燥机的方式

信息来历: | 宣布日期: 2013-02-04 16:05:29 | 阅读量:548
关头词:你应当晓得喷雾枯燥机的方式

它包含三个阶段,利用的邃密喷雾或滴在雾化进程中的任何液体进料,喷雾打仗和悬浮的热气体经由进程一个流,许可液体的蒸发和撤除枯燥的固体,在近似的外形和尺寸的雾化液滴。^后,经由进程的气体流中,被分别干粉物资并搜集。略去枯燥气体此刻被视为知足环境请求,以后将被氛围内发射,或它能够被从头散发体系内。

重点选项雾化的
能够利用各类范例的喷涂,包含离心式,声波雾化喷嘴和氛围。
的颗粒尺寸散布在介质上几近是恒定的,在任何给定的方式,该方式被用于雾化。屋面介质自身能够从尽能够小为15微米至250微米的范围内变更,可是,它是极大地依靠于已被发送到的液体的能量的数目。另外,品质液流,固体含量,粘度和外表张力,对粒径有间接的影响,但不车轮的圆周速率的程度。是以增添的进料速率内也能够增添的粒子的巨细,但利用一个可变速率的离心雾化器,能够便利的巨细已被指定的校订。

放射雾化喷嘴的另外一个罕见的范例是液压的压力。在这里,流体是经由进程泵加压,而后自愿穿过的孔,以分别该液体内细滴。的孔的巨细的范围内约莫0.5至3毫米的范围内。其成果是,一个简略的喷嘴界说为约700 kg / h的全部进料,这也是依靠于粘度,压力,尺寸的孔的固体含量和无限的挨次。

抛弃一切经由进程该节省孔的查问成果在更小的液滴,并削减对任何给定的进料流的粒子的巨细的增添的压力,喷嘴须要将替代的一个更小的孔。这也须要更大的压力从泵,以便取得准确的数目,经由进程放射器的流量。一些大型体系中能够有多达50喷嘴,从而,使得难以节制粒子的巨细。

首要用于小型喷雾枯燥器体系的第三个方式是在双流体气动雾化。凡雾化来实现,经由进程第^体与第二流体是常紧缩氛围内建立一个环境的彼此感化。在这类环境下,不管是氛围的压力,也不液体的请求长短常高的。或许,一个典范的200至350千帕范围内,能够实现这项任务。的粒子的巨细来节制,经由进程转变液体活动的紧缩氛围流的全体比例。

这品种型的雾化甲大有裨益能够归因于下降的速率程度的液体在分开喷嘴,这也致使的飞翔途径,须要较短的枯燥时候。与此相干,双流体喷嘴的进程变得合适于利用在尝试室和中试范围的装备。

essentials that you should know for your spray dryer
posted on september 12, 2012 by admin
comprising of three stages, spray dryer is used with the atomization process of any liquid feed in a fine spray or drops, the spray contacts and is suspended through a stream of hot gas, allowing the evaporation of the liquid and removing the dry solid, in the similar shape and size that of the atomized droplets. finally, through the gas stream, the dry powder substance is divided and collected. the spent out drying gas is now treated for meeting environmental requirements after which they are emitted within air or it may either be re-circulated within the system.

the key option atomization
various types of spraying can be used, including centrifugal, sonic atomization nozzle and air.
the particle size distribution on the medium is almost constant in any given method that is used for atomization. roofing medium itself may vary from as small as 15 microns to a range of 250 microns; however, it is greatly dependant on the quantity of energy that has been transmitted into the liquid. moreover, the mass liquid flow, the solid contents, its viscosity as well as the surface tension, have a direct influence on the particle size but, not to the extent of the peripheral speed of the wheel. thus an increase within the rate of the feed might also increase the size of the particle, but using a centrifugal atomizer of a variable speed can facilitate the correction of the size that has been specified.

another common type of spray atomizing nozzle is the hydraulic pressure. here the fluid is pressurized by means of a pump and then forced to pass through a hole in order to divide that liquid within fine droplets. the size of the holes lies within the range of approx 0.5 to 3 mm. the result is that a simple nozzle is defined to a limited order of about 700 kg / h of the entire feed, which is also dependant on the viscosity, pressure, size as well as the solid contents of the orifice.

an increased pressure of the drop all over that orifice results in smaller droplets and to reduce the size of the particle for any given flow of the feed, the nozzle requires to be replaced by a much smaller orifice. this also requires greater pressure from the pump so as to obtain the right quantity of the flow that passes through the injector. some large systems can have as much as 50 nozzles, thereby, making it difficult to control the particle size.

the third method being used mainly in small spray dryer systems is the two-fluid pneumatic atomization. where atomization is achieved through creating an environment of interaction within the first fluid with the second fluid that is normally compressed air. under this situation, neither the air pressure nor the liquid requires to be really high. perhaps, a typical range between 200 and 350 kpa can get the job done. the size of the particles is controlled through changing the overall ratio of the liquid flow to that of the compressed air flow.

a great benefit of this type of atomization can be attributed to the reduced velocity levels of the liquid at the time of exiting the nozzle, which also results in a flight path requiring shorter drying. with this, the two-fluid nozzle process becomes suitable for using in equipment of laboratory and pilot scale.

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