overview
Exhaust gas purification tower is a widely used method for treating acidic and alkaline exhaust gases, such as HCL S0₂、 H₂S0₄And NH₃Wait for acidic and alkaline gases, widely used in electronic industries such as PCB, CCL, TFT-LCD, metal pickling and electroplating, rubber deodorization, garbage deodorization, chemical and pharmaceutical industries for waste gas treatment. Adopting a washing tower treatment method with mature technology, stable operation, and good treatment effect. This method can perform multi-stage continuous processing on multiple gas components and has a wide range of adaptability. This process is suitable for processing large gas volumes and high concentrations of acidic and alkaline gases. Its characteristic is to maximize gas-liquid phase contact, enhance gas-liquid phase mass transfer rate, and achieve the purpose of treatment. In the chemical washing and absorption process, the concentration and dosage of the agent can be changed according to the changes in gas concentration and composition, reducing operating costs and improving treatment efficiency.

Equipment structure
The washing tower consists of the following components:
1. The washing tower body includes: water storage tank, filling layer, dewatering layer, window and base, etc.
2. The circulating water section includes: circulating water pump, sprinkler pipe, spiral anti clogging nozzle, water level control valve and switch.
3. The dosing system includes: pH online detector, medication metering pump, medication tank, agitator, liquid level sensor, etc.

Working principle
After being collected by the gas collection hood and pipeline, the exhaust gas is introduced into the washing tower treatment equipment by a centrifugal fan, and then the gas is sent to the chimney system by the centrifugal fan, and the treated clean air is discharged at high altitude.
The conditions for treating exhaust gas in a washing tower are to install high-pressure nozzles in the equipment circulation spray system at a certain temperature and pressure, and to use good filling materials to achieve atomization of the sprayed liquid. At the beginning of gas-liquid phase contact, the dissolution or absorption of components is the main process. With the extension of time and the increasing concentration of absorbent in the solution, the absorption rate will gradually slow down, while the rate of desorption and absorption will continue to increase. At a certain moment, the absorption rate and desorption rate are equal, and the transfer between gas-liquid phases reaches equilibrium - phase equilibrium. When reaching phase equilibrium, it indicates that the dissolution process has stopped. Therefore, it is necessary to replace the clean washing solution at this time, otherwise the absorbed components in the solution may also escape back to the gas phase from the liquid phase, forming desorption.

characteristic
1. Large production capacity and increased processing capacity per unit cross-sectional area.
2. High processing efficiency - hydrophilic gas has high absorption efficiency.
3. Simple structure - backwash and cross type, backwash structure is suitable for small space installation; The cross structure is suitable for high-altitude restricted installation.
4. Stable operation and high flexibility - The system structure is simple and has maintenance and inspection ports, and the material is generally made of anti-corrosion materials.
5. Low resistance - that is, the pressure drop of gas passing through a unit height packing layer is small.