The construction methods of waste gas treatment equipment vary depending on their treatment technologies and processes. The following are the structural features of several common waste gas treatment equipment:
1. **Activated carbon Adsorption device**:
- Usually includes air inlet, adsorption bed, air outlet and activated carbon replacement system. The exhaust gas enters the adsorption bed equipped with activated carbon from the air inlet, the harmful substances in it are adsorbed by the activated carbon, and the purified gas is discharged through the air outlet. When the activated carbon is saturated, it needs to be replaced or regenerated through drawers or moving beds.
2. **Zeolite runner concentration-catalytic combustion device**:
- The structure mainly includes a pre-filter, zeolite runner, high-temperature incinerator and heat exchanger, etc. . The exhaust gas is first pretreated to remove large particles, and then adsorbed and concentrated in a zeolite runner. The concentrated high-concentration organic exhaust gas is then introduced into the catalytic combustion chamber for high-temperature oxidation and decomposition.
3. **Regenerative thermal oxidizer (RTO)**:
- Mainly composed of ceramic regenerator, combustion chamber, switching valve, chimney, etc. The exhaust gas enters the combustion chamber after being preheated in the regenerator, and is oxidized and decomposed into harmless substances at high temperatures. At the same time, the regenerator is used to recover heat to reduce energy consumption.
4. **Biological filter**:
- Biological filter is composed of multiple layers of filling materials such as ceramsite, wood chips, plastic balls, etc., and is inoculated with microorganisms. When the exhaust gas passes through these packing layers from bottom to top, the pollutants in the exhaust gas are degraded and absorbed by microorganisms.
5. **Spray Tower**:
- There is a packing layer with nozzles inside the spray tower. The acidic and alkaline exhaust gases enter from the top of the tower and counterflow. The washing liquid below is fully contacted and a chemical reaction occurs, thereby achieving the purpose of neutralization and absorption.
6. **Photocatalytic oxidation equipment**:
- The equipment is equipped with a multi-layer TiO2-coated catalyst carrier. The exhaust gas passes through the catalyst layer under ultraviolet light irradiation, and VOCs It is converted into carbon dioxide and water under the action of photocatalyst.
The above types of equipment have their own specific design structures and working principles. The specific choice of equipment depends on the composition, concentration and emission standard requirements of the waste gas to be treated.