Centrifugal Mist Collector

How different types of mist collectors work?

Mist collectors’ major function is to remove mist and smoke droplets from the airflow. This is to maintain the air quality and the health of the personnel in a confined space.

Since there are different types of mist collectors available on the market, how can customers figure out which one to purchase? Here is the most comprehensive information of centrifugal mist collectors, cartridge mist collectors, and electrostatic precipitator mist collectors. It can surely help customers to make the right decision.

 


1. Centrifugal mist collectors

Initially, centrifugal mist collectors were used by the marine. The function of it is to collect mist on nuclear submarines. There is a rotating filter that can gather/trap small dust or droplets of mist. All is done by the revolving mist collection system. The mechanics are based on high-velocity air created by the centrifugal force. The centrifugal forces then push liquified oil along the machine’s wall. Finally, clean air is sent back into where it came from. Thus, personnel in a confined space can breathe with clean air. 


2. Cartridge mist collectors

The second type is called cartridge mist collectors. Some call it “media filter mist eliminators”. The main structure is a HEPA filter that can efficiently remove industrial mist the air. Compared to the centrifugal mist collector, the process of cartridge dust collectors is relatively simple. Firstly, a fan or blower is responsible for drawing dirty air, which contains oil smoke into the cartridge. Then, their hazardous particles are filtered by a HEPA filter, which can successfully filter out the droplets and mist.
 

3. Electrostatic precipitator mist collectors

It applies a high voltage to charge and gather mist particles and droplets. This kind of dust collector is commonly used for filtering mist and oil in industrial settings. The cleaning process is not complicated, either. It imparts a positive charge onto dust particles or droplets. Then, the air containing these electrified particles passes a series of negatively-charged plates. Since the particles are all carried with a positive charge, they are naturally attracted to the plates. During the process, the particles stick to the plate. That is to say, the hazardous droplet and particles re completely removed from the airflow.


Criteria applied when choosing dust collectors

The performance of a mist/dust collector can be characterized by these measurable properties, including pressure drop, efficiency, flow rate, mist concentration, mist temperature, type of mist, and mist droplet size distribution.


1. Pressure drop

In the energy cost equation, the pressure drop of the collector is important. When adjusting the pressure drops, the energy consumption required during the process varies as well. With more pressure drops being used, the process requires more energy to pull the airflow through the collector.


2. Efficiency

The efficiency is determined by how much of the mist, dust, and smoke droplets can be removed from the airstream. It is important since it shows how clean the airflow coming out from the collector will be. This is one of the most important criteria in rating a dust collector.


3. Flow rate

This characteristic determines how much air will be cleaned throughout the process. The flow rate should be deliberately adjusted to fit the requirement to its working space. If the flow rate is too low, there will not be enough airflow to be cleaned while the collector is running. However, if it is too high, there will be energy waste. Also, the airflow should remain constant to maintain an efficient droplet capturing environment.


4. Mist temperature

The cleaning process sometimes involves condensation, which is likely to occur in high-temperature mist or droplet. As the temperature goes up, the size of the droplet is affected as well (become bigger). It consequently affects the means of collection. Some apply water-based coolants. By draining cool water into the working system, water evaporates at higher temperatures and makes the space cooler. The mechanism can effectively create smaller droplet sizes.


5. Type of mist

Different types of mist droplets, mist particles require different means to clean. When choosing cleaning methods and dust collectors, the type of mist that needs to be removed must be taken into consideration. Different particles all impact a mist collector’s ability in different ways.

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