Learn how regenerative thermal oxidizers (RTOs) can significantly reduce VOC emissions and improve air quality in the printing industry. Learn about our efficient, cost-effective, and environmentally friendly RTO solutions tailored for your printing business.
Exhaust Gas Concentration：400mg/m³～5000mg/m³
Emission Limit Values：NMHC≤50mg/m³
Organized waste gas:
Printing oven: During the printing process, the ink needs to be dried in a high-temperature oven. A large amount of VOCs will be released during this process.
Laminating machine oven: The adhesives and solvents used in the laminating process will also volatilize at high temperatures to produce waste gas.
Unorganized waste gas:
Printing workshop: Various operations in the printing workshop, such as ink mixing, cleaning equipment, etc., will produce unorganized waste gas.
Ink mixing room: During the ink mixing process, the mixing of ink and solvent will produce a large amount of VOCs.
Unorganized Capture + Zeolite Wheel Concentration + Organized Air Reduction + Concentration Increase + Rotary RTO + Waste Heat Recovery
Schematic diagram of unorganized waste gas emission points of printing presses
Solution: Remodel the structure of the return air device.
For equipment with a decent oven structure but a poor return air passage, increase the back exhaust to increase the return air volume
Ideas for controlling unorganized waste gas
The “box-type internal circulation” LEL parallel air reduction and concentration heating device is a hot air heating device for flexible packaging printing machines. Its excellent air reduction and concentration concept can significantly reduce the total exhaust volume of the equipment and increase the exhaust gas concentration while ensuring that the drying capacity does not decrease. While saving heating energy consumption, it can be perfectly linked with the rear-end rotary valve RTO equipment to solve the company’s VOCs emission control problem.
The main technical features of the “box-type internal circulation” LEL parallel air reduction and concentration device are:
Processing method:
1. The color group circulation fan and the color group exhaust air valve actuator are linked to each other;
2. The printing press main exhaust fan and the traction roller operation signal are linked to each other;
3. The main exhaust fan and the main exhaust air valve actuator are linked to each other;
4. The negative pressure sensor detects the negative pressure value to control the main exhaust fan frequency, thereby ensuring the stability of the pipeline negative pressure.
(Take 300,000 Nm³/h as an example)
| Performance parameters | Rotary valve RTO | RTO lift valve |
| Processing air volume | 300,000 Nm³/h | 300,000 Nm³/h |
| Reversing valve structure | Rotary valve | Lift valve/butterfly valve |
| Number of reversing valves | 3 | 27 |
| Frequency of reversing valve switching impact | Continuous operation without impact | 6.48 million times/year |
| Number of heat storage beds | 36 beds | 9 beds |
| Cross-sectional area of single heat storage chamber | 20,000 Nm³/h | 75,000 Nm³/h |
| Filling weight of single-chamber heat storage ceramic | 3㎡ | 14㎡ |
| Number of burners (pieces) | 3,300 kg | 15,600kg |
| Occupancy (length * width) | 3 | 5 |
| Single-chamber processing air volume | 26m×8m | 48m×5m |
The global printing industry is a huge market involving a variety of products such as books, magazines, packaging materials, labels, etc. With the rise of e-commerce and digital media, although the demand for traditional printing has declined, the demand for packaging printing and other professional printing fields is still growing. The development of digitalization and automation technology has greatly improved printing efficiency and quality. Advanced printing equipment and processes make the production process more efficient and flexible. More and more printing companies have begun to pay attention to sustainable development and adopt environmentally friendly materials and technologies to reduce the impact on the environment.
Regulatory pressure: Governments and international organizations are increasingly stringent in their requirements for environmental protection, and the printing industry is facing increasing compliance pressure. For example, the EU’s REACH regulations and the US’s Clean Air Act have put forward specific requirements for emission standards.
Public awareness: Consumers are paying more and more attention to environmental protection, and they are more inclined to choose companies that take environmental protection measures. This forces printing companies to not only comply with regulations, but also actively improve their environmental image.
Cost pressure: Although environmental protection technologies are constantly improving, implementing these technologies often requires higher initial investments. For small and medium-sized enterprises, how to find a balance between cost control and environmental protection investment is a challenge.