Waste gas enters from the bottom of the tower and flows upward, while an absorbent is sprayed from the top and flows downward, creating a counter-current gas-liquid contact. Pollutants in the waste gas are transferred into the liquid phase, where they undergo dissolution or neutralization reactions. The purified gas passes through a demister at the top of the tower before being discharged. The absorbent liquid is circulated from the bottom of the tower, with fresh reagents added or spent liquid removed as needed, depending on operational conditions.

High-concentration acidic/alkaline exhaust gases, soluble VOCs, HCl, HF, NH3, NOx, etc.;
Treatment capacity (air volume): 500–30,000 m³/h;
Material selection: PP (≤80°C), FRP (≤120°C), and stainless steel (up to 300°C).

1) Rubber-lined carbon steel
Advantages: The rubber lining provides corrosion resistance, making it suitable for environments with weak acids or alkalis.
Disadvantages: The rubber lining is prone to aging and requires periodic replacement.
2) 304/316/316L stainless steel
Advantages: Suitable for high-temperature, high-humidity, and corrosive environments (such as those involving the absorption of acidic or alkaline liquids); 316L, in particular, offers superior corrosion resistance compared to 304.
Disadvantages: Relatively high cost.
3) Fiberglass-reinforced plastic (FRP)
Advantages: Lightweight, highly resistant to acid corrosion, and moderately priced.
Disadvantages: Poor temperature resistance; generally unsuitable for high-temperature operations (typically <100–120°C).
4) PP (polypropylene)
Advantages: Low cost; suitable for corrosive environments at low to medium temperatures.
Disadvantages: The material tends to soften and deform at medium to high temperatures.

Exhaust gas treatment for fine chemicals, pharmaceuticals, electroplating, smelting, laboratory operations, chemical production, and new energy battery manufacturing.

Capable of handling high-concentration gaseous pollutants with a high treatment load;
Available in packed tower or tray tower configurations, selected based on specific absorption efficiency requirements;
Compatible with various materials to suit highly corrosive operating conditions;
Can be equipped with automated pH-based dosing systems and waste liquid discharge systems.

An absorption tower is a type of wet exhaust gas treatment unit that facilitates thorough contact between a liquid absorbent and the exhaust gas. Through physical dissolution or chemical reactions, it removes acidic, alkaline, or soluble gaseous pollutants from the gas stream. These towers are constructed as either packed towers or plate (tray) towers and are fabricated from materials such as PP, FRP, or 304/316L stainless steel. While the operating principle is similar to that of a spray tower, absorption towers are better suited for handling high-concentration exhaust gases and for absorption processes in fine chemical production.