1. Adsorption capacity
The amount of adsorbate adsorbed by a unit of activated carbon becomes the adsorption capacity, and it is also called the activity of activated carbon in the industry (there are two ways of expressing static activity and dynamic activity). The adsorption capacity of chemical filters varies with different adsorbents or adsorbates. Depending on the temperature and background concentration, the adsorption capacity will also be different.
Static activity is also called static adsorption capacity, which is the adsorption capacity when the adsorbent reaches equilibrium.
Dynamic activity, also known as dynamic adsorption capacity, means that the fluid mixture passes through the activated carbon bed, and the adsorbate is adsorbed. After a certain period of time, the fluid flowing out of the activated carbon bed begins to contain adsorbate. At this time, the activated carbon has adsorbed the adsorbate. The amount is called the activity of activated carbon, which is an important data needed to design a large number, frequent and important adsorption systems.
2. Rated air volume
The rated air volume indicates the capacity of the filter to handle the air volume per unit time, which actually reflects the installation space occupied by the activated carbon filter.
3. Filtration speed
If the filtration rate is low, the air stays in the adsorbent layer for a long time, and the adsorption effect is also good. It is necessary to ensure a certain filtration rate and a certain air supply volume, which is related to multiple factors such as the structure of the filter, the type, shape, particle size, and thickness of the carbon layer. Generally, the filtration rate is 20-50cm/s.
4. Filter resistance
Filter resistance is an indicator related to operating costs. In the case of a certain air volume, the pressure drop of the airflow on the filter should be as small as possible. After the adsorbent is determined, the air volume, resistance and residence time of the gas in the activated carbon layer of the chemical filter should be comprehensively considered in the design.
5. Service life
The concentration of AMC at the outlet increases with the prolongation of the adsorption time of the activated carbon filter. When the harmful gas reaches a maximum allowable value, the filter is scrapped. This period of time is the service life of the activated carbon filter.
6. Efficiency
The efficiency of chemical filters depends on many factors, such as adsorbent performance, filter structure, filtration wind speed, etc. When other conditions are constant, the filter efficiency has a great relationship with the filtration wind speed. That is, the wind speed is low and the efficiency is high.
