The application of zeolite molecular sieve rotor adsorption and concentration process in the treatment of spray painting exhaust gas

The zeolite molecular sieve adsorption concentrator rotor operates in a rotating adsorption rotor structure, maintaining stable rotation, ensuring consistent adsorption and desorption air velocities, and conducting continuously, thereby achieving stable desorption concentration and high purification efficiency. It is currently the world's leading equipment for treating organic waste gas, applicable in large-scale spraying workshops, furniture factories, chip, LCD LED and other high air volume, low concentration scenarios. It converts the originally high air volume, low concentration industrial organic waste gas into low air volume, high concentration waste gas.

Its working principle is: The rotating adsorption rotor is divided into two parts: treatment and regeneration. The rotor rotates slowly to complete the adsorption process continuously. When the organic waste gas passes through the treatment area, the components of the waste gas are adsorbed by the adsorbent in the rotor, and the waste gas is purified and discharged. The rotor gradually approaches adsorption saturation. At the regeneration area, hot air passes through the adsorbed rotor, the adsorbed waste gas is desorbed and carried away by the hot air, thereby restoring the rotor's adsorption capacity. The desorbed hot gas enters the RTO/CO device for oxidation treatment. It is an efficient organic waste gas treatment equipment for treating industrial organic waste gas with low concentration and high air volume. 

After years of research and development in Qingdao Nabok Environmental Protection, they have mastered the core technology of molecular sieve rotors and developed the first domestic molecular sieve rotor. Through multiple case studies, its performance is at the international level. However, the price is 30% lower than similar products in regions such as Japan, the United States, Europe, Taiwan, etc. Nabok zeolite rotors have over twenty successful cases in VOCs treatment and are highly experienced! For the treatment of large air volume and low concentration waste gas environments, they are technologically advanced. Now, let's introduce an application case of the zeolite molecular sieve adsorption concentrator rotor in the spray painting condition for you:

Take the exhaust gas treatment system of the spray painting workshop of a certain machinery company as an example
Source of exhaust gas	Painting room painting waste gas	Exhaust gas components	Xylene, cyclohexanone and other paint thinners
Exhaust gas temperature	Room temperature	Exhaust gas volume and concentration	40000m³/h，251.6 mg/m³

Naboko, based on the characteristics of the working conditions, designed a low-energy consumption and high-efficiency treatment plan:

1. Use a zeolite molecular sieve rotor for adsorption and concentration followed by catalytic oxidation for waste gas treatment.

2. Equipment overview:

Equipment name: Zeolite molecular sieve rotor adsorption and concentration + catalytic oxidation;

Equipment load: 40,000 m³/h at normal temperature;

Adsorption material: High-efficiency molecular sieve

Catalyst: Ceramic carrier precious metal catalyst;

Insulation material: High-alumina-silica-aluminum fiber modules;

Equipment size: Approximately 12m × 5m (L × W);

Equipment weight: Approximately 9 tons;

Effect: Meet the GB16297-1996 "Integrated Emission Standard for Air Pollutants", non-methane total hydrocarbons ≤ 120mg/m³;

1. Adsorption material: International-leading zeolite molecular sieve adsorption rotor

During operation, the rotating adsorption rotor continuously performs adsorption and desorption, and the concentration of the desorbed concentrated waste gas has small fluctuations, which is conducive to the stable and safe operation of the entire system and ensures the stability of the heat output from subsequent treatment units.

2. Catalyst: High-performance high-quality precious metals

The removal efficiency of the high-performance catalyst is high (>98%), significantly reducing the activation energy of the reaction, allowing the catalyst to operate at medium and low temperatures (~300°C); it has strong heat resistance, with a maximum working temperature of approximately 650°C; at the same time, using a ceramic carrier with high-temperature stabilization treatment ensures that the catalyst does not burn and maintains a high specific surface area, high mechanical strength, and high thermal stability of the catalyst.

3. Heat storage material: Heat storage ceramic using dense cordierite material

Compared with ordinary ceramics, it has significant advantages such as excellent heat resistance shock performance and low thermal expansion coefficient, making it more suitable for waste gas treatment under heat exchange working conditions.

3. Process characteristics

Considering the flammable and explosive nature, strong fluidity, and concealed changes of organic waste gas, the equipment has been designed with safer, more stable, and more convenient structural and electrical control configurations.

1. The system is equipped with an emergency three-way valve. When operating normally, this valve is closed; when maintenance is required, the valve automatically opens, ensuring that the normal production of the workshop is not affected by the purification system failure.

2. A safety relief plate is set on the top of the box to ensure the maximum safety factor of the equipment in emergency situations.

3. The equipment and pipelines use high-insulation performance materials for full insulation, ensuring the external temperature while reducing heat loss.

4. The equipment is equipped with multiple filters to pre-treat the waste gas to prevent blockage of the zeolite molecular sieve rotor.

5. A fresh air inlet is set to be used as a system purge during startup, failure, and shutdown to prevent equipment accidents.

6. The equipment adopts a programmable logic control mode to reduce thermal shock to the heat storage ceramic and catalyst, extending the service life by more than 20% compared to the uncontrolled mode.

7. PLC electrical control is used, recording control points such as LEL monitors, temperature, and pressure for the key parts of the system (such as inlet and outlet, furnace, and heat storage bed), and performing logical control through self-written programs.

① The PLC system automatically records key points of equipment operation, providing reliable data support for equipment maintenance. In different operating states such as startup, stop, and failure, the PLC can automatically execute different control modes to minimize standby energy consumption; when control points such as temperature and pressure of the equipment deviate, the system emits audible and visual alarm signals and automatically takes emergency measures; at the same time, a workshop emergency stop signal is reserved as the control point with the highest priority for equipment control.

② The equipment is equipped with an air cut-off and power-off protection system. The system is installed with power-off protection, overload protection, line fault protection, and misoperation safety protection devices. All electrical equipment is reliably grounded to ensure the safety of the system in special conditions

Global core equipment and adsorption material supplier, Qingdao Nabok Environmental Protection!