1. What are wet scrubbers?
Scrubbers work by literally “scrubbing” exhaust
streams of unwanted particulates or gases. In the
simplest terms, wet scrubbers do this by using a liquid
to capture these particles or to react with the gases.
While the term “scrubber” is used across particulate
and gas scrubbers the devices can be very different and
suitable for varying applications.
It’s important to remember that when you’re using a
wet scrubber to remove particulate, it’s a scientific
process. The higher the pressure the more turbulent it
will be. The more turbulent the process the more likely
it is that a droplet will impinge with a contaminate and
the more efficient it will be. The amount of pressure
required will be dictated by the particle size
distribution and amount of particulate and the required
efficiency of the machine
2.Các nhân tố chọn thiết bị?
A detailed understanding of the different types of wet
scrubbers is essential to finding a solution that
operates at a high enough efficiency for the specific
particulates requiring removal. When we approach an
odor/dust control project, we always start with a full
survey to understand these requirements.
Questions we need to ask include:
- The type and quantity of particulates in the air.
- The nature of the odor issue, gas analysis if required,
- Water consumption, trade effluent permit limits, type
of system (i.e. once through or recirculatory),
- What is required to control the contaminant at the
point of release and efficiency of the machinery
3. Các Ứng Lĩnh Vực Sử dụng lọc kiểu ướt:
While there is some overlap between dry dust collectors and wet scrubbers
in terms of application, certain dust management needs and air quality
control requirements are best met by using a wet scrubber. A wet scrubber is
often a great choice when you have any of the following:
- Bụi ẩm ướt và dính/ Wet or sticky particulate
- Bụi có tính chất dễ hòa tan/ Soluble particles
- Bụi mịn và ở dạng sương/ Fine particles and mists
- Dòng khí ẩm và hơi ẩm/ Humid air and moisture in your gas stream
- Hỗn hợp chứa cả bụi và khí và hơi/ Mixes of particulate and gases/vapors.
- Bụi có tính chất cháy nổ cao/ Combustible dust as food (e.g., candy,
sugar, spice, starch, flour, feed), grain, tobacco, plastics, wood, paper, pulp,
rubber, pesticides, pharmaceuticals, dyes, coal, metals (e.g., aluminum, chromium, iron, magnesium, and zinc)
4. MECHANICALLY AIDED SCRUBBERS “CENTRIFUGAL TYPE”:
In a centrifugal scrubbing system, an impeller acts as
both the air mover and the device that removes the
contaminant. This means there is no additional filter to
add resistance and they also tend to use less energy,
even though they are less efficient than a typical fan
for the same duty.
Dirty air is sucked into the fan and sprayed with water
where droplets and contaminant are forced to interact.
The fan blades are specially shaped to fling the
particulates (e.g. sludge) causing the odor out to the
edges which is sent away as slurry, while clean air
continues through the fan.
Centrifugal types of wet scrubbers are popular with
food production applications as they are an effective
way to remove grease and oil mist. They are also a
good choice for applications such as tissue and sewage
sludge.
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