Hebei Hankai rubber wiper seal
Another important category is the gas-phase filter, which targets gaseous pollutants such as volatile organic compounds (VOCs), sulfur dioxide (SO₂), and nitrogen oxides (NOₓ). These substances pose significant health risks and contribute to the phenomena of smog and acid rain. Chemical sorbents, such as activated carbon, zeolites, and silica gels, are commonly used in gas-phase filters to adsorb or react with these harmful gases, thus preventing them from entering the atmosphere.
gas filter

In a shell and tube heat exchanger, one gas stream flows through a series of tubes while the other gas stream flows around the outside of the tubes in a shell. Heat is transferred from the hot gas stream to the cold gas stream through the walls of the tubes. This type of heat exchanger is highly efficient and is commonly used in applications where a large amount of heat transfer is required.
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