Industrial Air Purification Systems
However, following the Industrial Revolution and the emergence of industrial zoning, the rapid expansion of heavy industry and increased consumption of petroleum products led to widespread environmental pollution, particularly of the atmosphere. What was once a local issue gradually became a global concern.
By the end of the 20th century, especially in developed countries, there was growing awareness of the need for effective air purification. It became clear that the well-being of not only individual nations but also humanity as a whole depends on environmental conditions.
This awareness triggered a global movement toward regulating atmospheric emissions. These efforts were formalized in international agreements such as the Kyoto Protocol (adopted in 1997), which required participating countries to establish limits on harmful emissions.
Alongside legislative measures, air purification technologies have significantly advanced. Modern systems are now capable of capturing up to 96–99% of harmful substances.
Applications of Industrial Air Purification Systems
Industrial Air Purification Systems are used, in one form or another, across nearly all industrial sectors. They are particularly critical in the following industries:
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Metallurgical enterprises, which emit:
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Ferrous metallurgy: particulate matter (soot), sulfur oxides, carbon monoxide, manganese, phosphorus, mercury vapor, lead, phenol, ammonia, benzene, etc.
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Non-ferrous metallurgy: particulate matter, sulfur oxides, carbon monoxide, and other toxic substances
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Mining and processing plants, which release soot, nitrogen oxides, sulfur oxides, carbon oxides, and formaldehyde
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Oil refineries, emitting hydrogen sulfide, sulfur oxides, nitrogen oxides, and carbon oxides
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Chemical industries, producing highly toxic emissions such as sulfur and nitrogen oxides, chlorine, ammonia, fluorine compounds, and nitrous gases
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Power plants (both thermal and nuclear), generating particulate matter and oxides of carbon, sulfur, and nitrogen
Key Functions of Industrial Air Purification Systems
Industrial Air Purification Systems perform several essential tasks:
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Particle removal — capturing combustion residues, dust, and aerosol particles for safe disposal
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Removal of gaseous impurities — including vapors, toxic gases, and radioactive components
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Recovery of valuable materials — extracting economically valuable particles, such as metal oxides, from the air stream
Classification of Air Purification Methods
There is no universal air purification method; therefore, most industrial facilities use multi-stage systems that combine several technologies for optimal results.
Air purification methods can be classified by their operating principle:
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Chemical methods — catalytic and sorption-based purification
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Mechanical methods — centrifugal separation, water-based cleaning, and wet scrubbing
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Physicochemical methods — condensation, filtration, and sedimentation
They can also be categorized by the type of contamination, such as systems designed specifically for dust removal.
Adsorption as an Air Purification Method
One of the most widely used air purification methods is adsorption—the process by which a solid material (adsorbent) captures gases from an air stream.
Today, the most common adsorbents include activated carbon and metal oxide-based materials. As with absorption processes, the efficiency of adsorption depends on several factors, including the type of pollutant, the properties of the adsorbent, and operating conditions such as temperature and pressure.
Gas air stream vent dry scrubber — a device for cleaning air by adsorption, is a container filled with an adsorbent. The contaminated gas flow is supplied under pressure to the working surface, the purified gas is discharged through a pipe in the upper part of the device. It is worth noting that the absorption capacity of the adsorber is limited, here we can draw an analogy with a filter that gets clogged over time. To achieve continuous operation, there are dual adsorption units, which consist of two containers operating alternately - while the gas is being purified in one container, the adsorbent is replaced in the other and vice versa.