CN1033492C - 液态和气态介质之间物质交换的方法 - Google Patents

液态和气态介质之间物质交换的方法 Download PDF

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CN1033492C
CN1033492C CN92100295A CN92100295A CN1033492C CN 1033492 C CN1033492 C CN 1033492C CN 92100295 A CN92100295 A CN 92100295A CN 92100295 A CN92100295 A CN 92100295A CN 1033492 C CN1033492 C CN 1033492C
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20Mixing gases with liquids
    • B01F23/21Mixing gases with liquids by introducing liquids into gaseous media
    • B01F23/213Mixing gases with liquids by introducing liquids into gaseous media by spraying or atomising of the liquids
    • B01F23/2132Mixing gases with liquids by introducing liquids into gaseous media by spraying or atomising of the liquids using nozzles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/70Spray-mixers, e.g. for mixing intersecting sheets of material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D47/00Separating dispersed particles from gases, air or vapours by liquid as separating agent
    • B01D47/06Spray cleaning
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D51/00Auxiliary pretreatment of gases or vapours to be cleaned
    • B01D51/10Conditioning the gas to be cleaned
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F31/00Mixers with shaking, oscillating, or vibrating mechanisms
    • B01F31/80Mixing by means of high-frequency vibrations above one kHz, e.g. ultrasonic vibrations
    • B01F31/81Mixing by means of high-frequency vibrations above one kHz, e.g. ultrasonic vibrations by vibrations generated inside a mixing device not coming from an external drive, e.g. by the flow of material causing a knife to vibrate or by vibrating nozzles
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F6/00Air-humidification, e.g. cooling by humidification
    • F24F6/12Air-humidification, e.g. cooling by humidification by forming water dispersions in the air

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Abstract

在导引一种气态介质的装置流体通道内,装有遮光板状或圆盘状挡板(20-22),这些挡板在其间构成起谐振空腔作用的空腔,因此形成流体运动状态和脉动,该装置为改进物质交换借助于高压喷嘴(8)喷射液态介质来达到。

Description

液态和气态介质之间物质交换的方法
本发明涉及一种液态和气态介质之间物质交换的方法,此时通过将液态介质喷射到一个由强制输送形成的气态介质流体内,本发明还涉及一种实施该法的装置。
例如对于空气洗涤或烟气净化来说是已知的,此时可以通过喷嘴将一种液体喷入到一个其横截面较大的流体通道内,以达到有尽量多的液体成分蒸发到气流内。在流体通道的终端设有隔板,以分离没有蒸发的液滴,并送回到一个贮槽内。
由英国专利说明书CB-A 364,239公开了一种清洗气体的装置,该装置同时还可以用于湿润或干燥气体。该装置具有一个喷射室,在该室内将要清洗的液体喷入到一个气流中。该喷射室附接有一个洗涤器,在该洗涤器内配置有一些板,而板上则设有许多小孔。此时迫使气体通过穿孔,形成一股强烈的涡流,从而使气体得到充分的清洗。
在欧洲专利EP-A 20352902中述及一种在流体流和边界层,例如在一个膜片上之间物质交换和热交换的装置。该装置具有一个流体的流动通道和一个脉动输送流体的泵。为了达到较好的交换,在流动通道中设有使流体产生涡流的挡板。
本发明的任务在于,找到一种上述类型的方法,用该法来使物质交换达到较为强烈,因而使实施该法的装置在大功率时可以设置成很紧凑,此外还使参与未蒸发的循环水大为减少。解决该任务的技术方案是,气态介质通过沿流动方向依次收缩和扩展的流道,从而使该介质与所喷射介质相接触经受速度和压力变化,并借助于至少一个高压喷嘴将液态介质喷入到气态介质的流体中,而该流体则已经通过至少一个收缩流道。实施该法的一种装置是,使该装置具有一个产生气流的装置、至少一个引导气态介质的流体通道,还有至少一个通入流体通道内的高压喷嘴,其特征在于,至少在流体通道的一部分内设有一些垂直于流体通道轴线安装的挡板,这些挡板沿流动方向相互间隔安装,这些挡板大大缩小了局部狭窄区域的流动横截面,并在其间构成空腔,此时其中至少一个高压喷嘴的出口是配置在流体通道的该部分内,而流体通道设有挡板的部分沿流动方向则是在高压喷嘴的出口前开始的。
本发明装置有利的结构形式有:使这些挡板由流体通道的遮光板状横隔板构成,流体流经这些隔板;也可以将这些挡板相互以间隔固定在流体通道横截面的中间区,并和流体通道的壁保持间隔,流体环绕它们流动;在流体通道具有挡板的部分配置有至少一个横截面呈弧形弯曲的流动导体,该流动导体将气态介质导入到流体通道没有挡板的横截面部分;挡板由垂直于流体通道轴线设置的平坦的或略呈弯曲的薄壁板构成;若干个具有蜂窝状整个横截面的流体通道是相互平行设置的,其中相邻的流体通道具有共同的壁板。
通过本发明使物质交换获得意外显著的改进,这样设置尺寸较小的装置就够用,足以使气态介质和液态介质达到饱和。此外在流体通道内尽管由于挡板产生的流动阻力是明显地小于预计的。也许这些常用的空气涡流发生在挡板之间的空腔内,而挡板则导引轴线方向的主流,这样尽管有能量消耗在涡流形成上而流动阻力还是较小的。增强物质交换可以用专门的流体动力学来说明,流体动力学是用周期性的压力交变和速度变化来表示(谐振)的,例如,谐振由配置挡板或由这些挡板构成的空腔(谐振空腔)强迫形成的。
下面借助于附图所示的实施例对本发明作详细说明,其中:
图1表示本发明一种装置的纵剖面示意图,
图2表示按图1装置在挡板区内纵剖面的局部图,
图3表示按图1和2装置的一个挡板局部图,
图4至6表示本发明装置流体通道横截面形状的造型实例,
图7表示设有环流挡板的流体通道示意图,
图8表示设有通流和环流挡板的流体通道示意图,还有
图9表示相互平行呈蜂窝状配置的流体通道局部透视图。
在装置的流体通道1内、进流孔2的后面配置有一个轴流式鼓风机3。与该鼓风机相邻接的是一个导向段4,这样就使气态介质以均速流到两种介质会合在其内的该装置区域5。在该区内该装置可以按照图1和2的实施例分成多个相互平行的通道段6,7(图2),其内各配置有一个高压喷嘴8,9,而喷嘴则将液态介质以极小的液滴分布到气流中。输送液态介质是通过一个配置在流体通道1内的管道栅10进行的,从管道栅出来、平行于流体通道1的轴线各有一个喷嘴管11,12在中心通入到各通道段6,7,各个高压喷嘴8,9则设在管端。一种适用的高压喷嘴:JATO分子喷雾器例如可由JATO喷嘴制造股份公司,CH-6015罗伊斯布尔(Reussbühl)提供。未被气流吸收的液态介质,例如这种情况特别是在装置起动阶段可能发生,由位于最下方的流体通道区通过管路41排出。
为在气流中产生脉动的速度变化,可在区5内或在上述通道段6,7内装入很多挡板14,15,使上述气流中液态介质是呈喷雾状被引入到流体通道内,而这些挡板则是通过其沿流动方向呈排状配置在其间构成起谐振空腔作用的空腔,并导致流动过程有周期性的剧烈收缩。由此产生的特殊流体运动状态使物质交换有显著的改进,同时流动阻力并没有过多增加。
流体通道或流体通道段的横截面形状可以设置成各不相同的,例如图4至6和9所示的实例。同时挡板16,17,18,19最好是沿横截面的切向固定地伸入到流体通道内,或是挡板设有尺寸恒定的径向宽度,从而使挡板按照流体通道的横截面轮廓来设置。图5和6的横截面形状在下部横截面区内起较快的流动作用,从而使下沉的液滴更好地流向那里由气流重新冲走。此外由湿润通道壁的液体形成较好的排水。然而由本发明主要的挡板可以在最大程度上防止通道壁上的液体从气流中分离出。为了排除积聚在流体通道下部内的液体,将该下部设成略有倾斜,而环状挡板下端则有一个小孔13。
为了有助于减少流动阻力,按照图7和8的实施例在具有挡板20至27的区5′,5″其始端配置有呈弧状弯曲的流动导体30,31,32,这些导体将气流呈喷嘴状导入到流体通道敞开的横截面区,挡板20至27并未伸入到该区内。
在所示的实例中挡板是由适配流体通道横截面形状的、最好是环形或圆盘状的板件构成,这些板件为了顶着流动方向增强涡流沿其边缘是可以弯曲的或是呈圆锥形弯曲,如挡板21,22,25(图7和8)所示那样。另一种流体障碍物的造型方案示于图3中设有折边28和波纹29。
为使挡板充分发挥作用,挡板深入伸到流体通道的流动横截面中,例如伸到其半径的三分之一部位,而其轴向相互间隔则处于其径向尺寸的数量级上。
图9示有装置的一个实施例,该实施例中呈波状的弯曲板相互是以很小间隔配置的,因此这些板构成多个具有中间排流缝隙39的流体通道34至38,而缝隙则引入其下的流体通道中。

Claims (8)

1.一种用于在液态和气态介质之间进行物质交换的方法,包括如下步骤:
使气态介质沿流动方向流经流道的连续间隔的约束;
仅当气态介质已流经至少一个约束后,用一高压喷嘴将液态介质以平行流方式喷入气态介质流内;
其中流道的两个所述连续的约束这样限定了一空腔,以使所述约束和至少一个空腔造成气态介质周期性的压力变化和速度交变(谐振〕,以达到所述物质的交换,同时使流动阻力最小。
2.按权利要求一所述的方法,其特征在于用高压喷嘴以5-600巴范围内的某一压力将液态介质喷雾;
3.一种用于实施按权利要求一所述方法的装置,其特征在于包括:
用以形成气流并产生气态介质的装置;
至少一个用以引导气态介质流的流体腔道;
至少一个通入流体腔道内的高压喷嘴,使液态介质以平行流方式流入气态介质流内,若干设置于流体腔道的至少一部分内的阻碍装置,所述若干阻碍装置横交于流体腔道的轴线,并沿流动方向彼此间隔设置,所述若干阻碍装置大大缩小了在局部狭窄区域内的流动横截面,并在它们之间限定了一些空腔,所述至少一高压喷嘴的出口处于所述若干阻碍装置配置于其内的流体腔道的所述部分,设有所述阻碍装置的所述流体腔道的所述部分,就流动方向而言,起始于高压喷嘴的出口前,其中,所述至少一高压喷嘴,仅在所述气态介质已流经所述若干阻碍装置的至少一个之后,将所述液态介质引入所述气态介质内,所述阻碍装置和所述至少一个空腔造成气态介质的速度和压力的交变,而使流动阻力最小。
4.按权利要求3所述的装置,其特征在于所述阻碍装置由流体腔道内的孔板型横壁构成,所述流体流经这些横壁。
5.按权利要求3所述的装置,其特征在于所述阻碍装置处于流体腔道横截面的中区,它们彼此间隔固定,且离流体腔道壁某一距离,所述流体环绕它们流动。
6.按权利要求所述3的装置,其特征在于所述阻碍装置允许流体流经它们和环绕它们流动,并被配置于流体腔道内。
7.按权利要求3所述的装置,其特征在于所述阻碍装置包括横交于流体腔道轴线的平的或略为弯曲的薄壁。
8.按权利要求7所述的装置,其特征在于若干整体蜂窝型横截面的流体腔道相互平行配置,其相邻流体腔道具有公用壁。
CN92100295A 1991-01-17 1992-01-17 液态和气态介质之间物质交换的方法 Expired - Fee Related CN1033492C (zh)

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CN1063423A (zh) 1992-08-12
US5387376A (en) 1995-02-07
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NO179702C (no) 1996-12-04
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IL100597A (en) 1995-08-31
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