功能
由于充满大量灰尘的气流与文丘里喉管中的洗涤液之间的相对速度较快，因此文丘里净气机的分离能力也较高。
为了加快气流速度，也为了加快洗涤液的速度，必须产生能源。这会导致气流出现压降，这里适合衡量分离能力的第一个压力表。如果进入洗涤区域前气流所含的水蒸汽饱和，或者更好的是，水蒸汽超级饱和，那么压力损失低，净气机也会达到良好的分离水平。当气体量波动时，气体与洗涤液之间的相对速度必须保持不变。
使用文丘里净气机，可以出色地实现这些目标。文丘里喉管和扩散器之间的差距可以使用可调整的锥形管进行改变，因此适合对应数量的气流。
在另一个合适的液滴分离机中，将分离携带微粒的液滴。一般来说，使用离心分离机或薄片液滴分离机。
为使分离效率达到最高，排出的气体在到达文丘里喉管之前，必须含有饱和的水蒸汽。就像在热气骤冷装置中一样，在文丘里净气机的气流入口区域适当地安放喷雾喷嘴，可以达到要求的饱和度。
主要特征
- 净气机功能直接可用（无闲置时间）
- 可分离浮质
- 负载范围大，通过可控制型文丘里喉管可以更好地响应部分负载
- 抗积垢，操作可靠性较高
- 维护工作量低
- 应用范围广，可以灵活合并和扩展
- 可用所有常见材料交付
应用范围
- 功率范围高达 200,000 立方米/小时的排出气体
- 可分离颗粒或浮质
Mid-Scale Venturi Scrubbers
Venturi Scrubbers are particularly well-suited for separating aerosols and fine dust from gas flows. They are the right choice for particle sizes from approximately 0.7 µm upwards.
The particles are separated by impaction on the washing media droplet in the venturi throat. The particle separation efficiency is influenced by the liquid spray density and the relative velocity between the particles and the gas/washing liquid mixture. The latter is achieved by forcing the mixture through a constriction within the equipment (= the Venturi throat).
To allow variable inlet flows we have developed a Venturi scrubber type equipped with a regulating cone in the Venturi throat. The control range lies between 20% and 100% load, with the same high separation rate.
The injection of the scrubbing medium is done by either a central liquid spray nozzle or by manifold nozzles arranged in the Venturi wall. The spray density can be improved by using e.g. steam driven dual fuel nozzles.
The Venturi scrubber cause pressure loss in the gas stream. At ambient pressure the typical range of pressure drop is 25 to 80 mbar. These values can differ depending on the overall pressure and the particle properties.
Working principle of venturi scrubbers
Large Scale Venturi Scrubbers
The large scale Venturi Scrubbers are the best option when high separation capacities of large flow rates of dust laden gases are needed.
The scrubbing liquid is injected through several nozzles in the inlet cone preceding the venturi throat. The scrubber may be mounted vertically, inclined or horizontally.
For cooling, gas conditioning and pre-dedusting, the scrubber is operated with a pressure drop of only a few mbar. The small pressure drop is obtained by approximately matching the velocity of the injected scrubbing liquid to that of the gas in the venturi throat. During deceleration in the diffusor, the relatively higher mass of the scrubbing liquid causes a further increase in the gas pressure.
Depending on the volume of liquid injected, much energy may be transferred to the gas; this not only avoids a pressure drop in the scrubber but generates an increase in the gas pressure. In contrast, when operating this type of scrubber with a large pressure drop, the gas/dust mixture enters the scrubbing zone at a higher velocity that the scrubbing liquid. Hence, the liquid droplets are accelerated by the gas stream causing a pressure drop. As speed rises, increasing turbulence is simultaneously induced in the scrubber, bringing intensive mixing of the scrubbing liquid droplets and the raw gas, this being a prerequisite for high collection efficiencies. Therefore, the higher the gas velocity in the venturi throat, the larger the pressure drop.
The gas/droplet mixture is divided in a centrifugal separator which is arranged downstream.
Large scale venturi scrubber
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相关产品
用于废气清洁的 GEA 净气机
在 1950 年开发出了可调环缝净气机，旨在提供灵活的装置，能够处理歧管工业排气问题，如今已经成为出色的高效率净气机。考虑到固体和液体灰尘颗粒的粒径以及气体混合物中气体成分的浓度，实际应用中在分离上没有对环缝净气机设定最小限制。
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Next generation scrubber for more than the non-ferrous metallurgical industry. Used for dust and particulate removal in saturated waste gases, Linear Flow Scrubbers offer increased energy savings and efficiency thanks to their high adaptability, adjustability capacity to steadily scrub at fluctuating gas flow rates.
喷射式净气机
垂直或倾斜立管带有垂直气体入口，推进喷嘴在侧面气体入口上方管道的中央。
Radial flow scrubber
Adjustable flow scrubbers with high collecting efficiencies achievement even when working with critical substances. Mainly used for either gas cooling (to reduce the temperature by water evaporation) or gas cleaning (to condense aerosols and remove solid impurities).
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