Zeolite molecular sieve rotary wheel is a rotary adsorption device prepared by attaching molecular sieve adsorbent material to a honeycomb porous carrier. The zeolite molecular sieve rotary wheel effectively adsorbs VOCs through adsorption concentration method, and is suitable for VOCs treatment with low concentration and high air volume.
The zeolite molecular sieve rotary device is a continuous variable temperature operation of the rotary wheel in the treatment zone, production zone, and cooling zone, which concentrates low concentration and high air volume organic waste gas into high concentration and low air volume organic waste gas. Its device characteristics are suitable for processing exhaust gases with high flow rates, low concentrations, and multiple organic components.
By rotating the wheel, gas concentration and zeolite production can be simultaneously completed on the wheel. The organic waste gas entering the concentration wheel is directly discharged into the atmosphere after being adsorbed and purified in the adsorption zone of the wheel at room temperature. Then, it enters the desorption zone due to the rotation of the wheel, where the zeolite adsorbed with organic matter desorbs. The organic matter adsorbed on the zeolite is separated, desorbed, and enters the subsequent treatment system, and so on.
Characteristics and advantages of zeolite molecular sieve rotary device:
1. High absorption and desorption efficiency convert high air volume and low concentration VOCs waste gas into low air volume and high concentration waste gas, reducing the cost of back-end final treatment equipment (RCO, RTO).
2. The pressure loss generated by zeolite rotary adsorption of VOCs is relatively low, which can greatly reduce the power consumption of adsorption fans.
3. The concentration factor reaches 5-20 times, greatly reducing the size of the post-processing equipment and lowering operating costs.
4. The overall system adopts pre assembly and modular design, which has the advantages of small footprint and unmanned operation mode.
5. The exhaust gas concentrated by the impeller can meet the national emission standards.
Zeolite molecular sieve wheel adapts to the industry:
Especially suitable for high air volume, low concentration occasions, including printing, large spray painting workshops, furniture, chip, LCD LED industry and other production enterprises.
Solution for zeolite molecular sieve wheel treatment:
After passing through the filter, organic waste gas enters the zeolite wheel for adsorption, and most of the waste gas is directly discharged into the chimney after adsorption and purification. Introduce a small amount of air to cool the overheated area of zeolite. Then, it exchanges heat with the high-temperature purified exhaust gas discharged from RTO or RCO to raise the temperature, and after supplementary combustion by the burner, it rises to 200 ℃. It enters the impeller to analyze the saturated adsorption part. After analysis, the gas enters RTO or RCO for high-temperature oxidation into carbon dioxide and water. After oxidation, the gas enters the heat exchanger for heat exchange and cooling before being directly discharged.
The zeolite molecular sieve wheel is divided into adsorption zone, desorption zone, and cooling production zone, and the wheel runs continuously at a determined speed.
Adsorption zone: After pre-treatment by a multi-stage filtration device, VOCs exhaust gas enters the molecular sieve rotary adsorption zone for adsorption. The clean gas purified by zeolite molecular sieve adsorption is directly discharged into the atmosphere through the chimney.
Desorption zone: Before reaching adsorption saturation, the molecular sieve in the adsorption zone rotates to the desorption zone and uses high-temperature hot air for desorption concentration. The desorption temperature is 180-220 ℃, and the heat-resistant temperature during operation can reach up to 350 ℃. By adjusting the rotational speed of the impeller based on the composition and concentration, high purification efficiency can be achieved; By setting the adsorption and desorption rates, the ideal VOCs concentration ratio (n=(S1 × V1)/(S2 × V2)=5-30) can be achieved, significantly reducing operational energy consumption.
Cooling production area: The detached molecular sieve wheel enters the cooling production area and is cooled by cold air or cold waste gas for production. The produced molecular sieve wheel rotates to the adsorption area and continues to adsorb VOCs waste gas, running continuously in a cycle.
Thermal oxidation unit: The concentrated organic waste gas after desorption is pumped by a fan to the thermal oxidation furnace for combustion and conversion into carbon dioxide and water vapor, which are then emitted into the atmosphere. The commonly used oxidation units that are usually paired with molecular sieve rotors include regenerative oxidation (RTO) and catalytic oxidation (CO), which can be selected according to different operating conditions. The heat released by the thermal oxidation of VOCs in the combustion chamber is partially used to maintain their own operation. If there is sufficient heat available for the desorption of the impeller or for preheating and recovery, such as in heat transfer oil boilers or waste heat steam boilers, it can greatly save energy.