Printing Industry Treatment Solutions
Regenerative Thermal Oxidizers serve as a highly efficient and reliable end-of-pipe treatment technology for volatile organic compound (VOC) emissions in the printing industry. They are particularly effective in destroying the complex mixture of solvents typically released from inks, coatings, and cleaning agents used in printing processes.
At present, RP Techniek BV rotary RTO has been widely used in VOCs management of plastic color printing food packaging, drug packaging materials, cigarette bag printing, PVC printing decoration materials, wine label printing, printing woven bags and other enterprises produced by printing technology.
- Characteristics of waste gas: large air volume and low concentration
- Source of waste gas: organized waste gas from printing ovens and laminating machine ovens; Unorganized waste gas from printing workshop and inking room
- Waste gas components: ethyl acetate, n-Propyl Acetate, butanone, isopropanol, ethanol, propylene glycol methyl ether acetate
- Process scheme: unorganized capture + zeolite rotor concentration + organized air reduction and concentration + rotary RTO + waste heat recovery
- Waste heat recycling methods: hot water recycling, steam recycling, hot air recycling, heat transfer oil recycling
- Waste gas concentration: 400mg/m³～5000mg/m³
- Emission limits: NMHC≤50mg/m³
Printing Industry 3D drawing
Printing industry rotary wheel + RTO system
Our Advanced Technology
1. Disorganized Emissions Control and Capture Technology
Technical Implementation
At the technical implementation level, focus is placed on targeted modifications to existing oven structures, particularly for equipment with adequate main structures but poor airflow. By optimizing the design of air return devices and enhancing back exhaust capacity, the return air efficiency and airflow organization are significantly improved. This technical implementation centers on addressing the bottleneck of inadequate airflow in original equipment through structural air return improvements, thereby ensuring the effective execution of the aforementioned control strategy at the hardware level and ultimately achieving efficient fugitive emission capture and enhanced overall treatment performance.
Ideas for controlling unorganized waste gas
- Ensure that the air supply system volume is ≤ the unorganized exhaust volume (to maintain a slight negative pressure in the workshop);
- Ensure that the air supply volume of the air conditioner at the printing press operating end is ≤ the unorganized exhaust volume of each piece of equipment (to maintain a slight negative pressure in the printing equipment);
- Install unorganized partitions for each printing press, and install magnetic curtains between color groups;
- Install unorganized top and side exhaust to capture unorganized exhaust gas at the oven outlet and the lamination area.
2. Air Reduction, Concentration, and Energy-Saving Technologies
"Box-Type Internal Circulation" LEL Parallel Air Reduction and Concentration Heating Unit
The “Box-Type Internal Circulation” LEL Parallel Air Reduction and Concentration Heating Unit is a hot air heating device specifically designed for flexible packaging printing presses. Its superior air reduction and concentration concept significantly reduces the total exhaust volume and improves exhaust gas concentration while maintaining drying capacity. While saving heating energy, it seamlessly integrates with downstream rotary valve RTO equipment to address VOC emission control challenges in enterprises.
Key Technical Features of the "Box-Type Internal Circulation" LEL Parallel Air Reduction and Concentration Unit
- All hot air components are centrally located within a single insulated box with a 50mm insulation layer. A built-in return air circulation channel reduces heat dissipation in ducts.
- Secondary return air circulation and short-path circulation significantly reduce duct resistance.
- Dual fans actively supply and exhaust air, with variable frequency speed regulation, and linearly adjustable air reduction and concentration ratios.
- Large-diameter exhaust and extraction minimize fugitive exhaust pollution in the workshop.
- Patented technology allows for independent parallel air reduction and concentration for each color group, ensuring no disturbance between colors.
Processing Method
1. Interlocking control of the color group circulation blower and the color group exhaust valve actuator.
2. Interlocking control of the printing press main exhaust fan with the pull-up roller operating signal.
3. Interlocking control of the main exhaust fan and the main exhaust valve actuator.
4. A negative pressure sensor detects negative pressure and controls the main exhaust fan frequency, ensuring stable duct negative pressure.
In the future, unorganized waste gas must not be “discharged secretly”. It should be concentrated by zeolite wheel adsorption and then sent to RTO for treatment.