Project Overview
As one of China’s most prestigious printing enterprises, China National Stamp Printing Factory has been responsible for printing numerous national commemorative stamps, zodiac stamp series, and politically significant stamp products since its establishment in 1959.
For more than six decades, the factory has represented China’s printing excellence while continuously upgrading its production technologies and environmental protection standards. Facing increasingly stringent VOC emission regulations in Beijing, China, the company launched a comprehensive upgrade of its waste gas treatment system and selected CADAIR as the official technology partner for the environmental renovation project.
To date, the CADAIR VOCs treatment system has achieved more than 3,350 consecutive days of stable operation, building a long-term operational benchmark for VOCs treatment in China’s printing industry.
Why VOCs Treatment Is Critical in Stamp Printing
The stamp printing process covers offset printing, gravure printing, screen printing, ink preparation and plate cleaning. A large amount of organic solvents are adopted in production, generating volatile organic compound exhaust gas with complex components.
Main VOC Pollutants
The exhaust gas mainly contains:
- Ethyl acetate
- Isopropanol
- N-propanol
- Butyl acetate
- Acetone
- Other Non-Methane Hydrocarbons (NMHC)
Key Treatment Challenges
VOC emissions from China’s printing industry are typically featured with:
- Large air volume
- Low pollutant concentration
- Complex solvent composition
- Strong irritating odor
- High photochemical reactivity
These characteristics bring great difficulties to efficient and stable exhaust gas purification. To comply with Beijing’s stringent local standard Emission Standard of Volatile Organic Compounds for Printing Industry (DB11/1201-2015), China National Stamp Printing Factory required a high-efficiency, safe and energy-saving professional VOCs treatment solution.
Why China National Stamp Printing Factory Chose CADAIR
After comprehensive evaluation of mainstream VOCs treatment technologies and equipment suppliers in China, the factory finally selected CADAIR for its mature technology, reliable equipment performance and rich industrial project experience.
CADAIR’s professional engineering team conducted detailed on-site investigations and systematic data analysis covering:
- Workshop airflow fluctuation patterns
- Real-time VOC concentration variation ranges
- Pollutant component characteristics
- Actual production and operating conditions
Based on the on-site working conditions, CADAIR customized a tailored treatment solution adopting the Zeolite Rotor Concentration + CO Catalytic Oxidation combined process.
Project Specifications
Core Project Parameters
| Item | Specification |
|---|---|
| Treatment Air Volume | 50,000 m³/h |
| Applicable Industry | Stamp Printing (China Printing Industry) |
| Main Pollutants | Ethyl Acetate, Isopropanol, NMHC |
| Treatment Process | Zeolite Rotor Concentration + CO Catalytic Oxidation |
| Project Operation Status | Officially operational since 2016 |
Process Flow
Collection System → Zeolite Rotor Concentration → Heat Exchanger → CO Catalytic Oxidation Furnace → Fan → Standard Compliant Emission
The complete system is equipped with multi-layer safety protection modules to adapt to the high safety standards of Chinese printing enterprises:
- LEL explosion-proof real-time monitoring
- Temperature interlock linkage control
- Emergency shutdown protection system
- Full-automatic intelligent operation management
Operation Results: Over 3,350 Consecutive Days of Stable Operation
Since official commissioning in 2016, the CADAIR integrated VOCs treatment system has achieved uninterrupted stable operation for more than 3,350 days.
Core Performance Highlights
- Stable VOC removal efficiency of over98%
- 24/7 continuous automatic operation
- All emission indicators far below China’s local regulatory limits
- Stable adaptability under peak production high-load conditions
- Ultra-low equipment failure rate
- Low frequency of maintenance and low operational cost
After nearly ten years of long-term operation, the core catalyst of the CO catalytic oxidation furnace still maintains high activity, and the zeolite rotor retains excellent adsorption performance without obvious performance attenuation. The project fully breaks the industry stereotype of short service life and easy attenuation of environmental protection equipment, setting a long-term stable operation benchmark for VOCs treatment in China.
Technical Advantages of Zeolite Rotor + CO Catalytic Oxidation Process
The combined process of zeolite rotor concentration and catalytic oxidation is the optimal solution for large-air-volume and low-concentration organic waste gas, which is widely recognized and applied in China’s industrial environmental protection field.
Key Technical Advantages
High Purification Efficiency
The zeolite rotor concentrates low-concentration and large-volume scattered VOCs into high-concentration and small-volume airflow, greatly improving the efficiency of catalytic oxidation treatment.
Energy Saving and Consumption Reduction
Built-in heat recovery and waste heat recycling system effectively reduces overall energy consumption, with better energy-saving performance than traditional direct combustion treatment processes.
Long-term Stable Performance
High-quality adsorbent and catalyst materials, together with optimized system logic, support years of continuous and stable industrial operation.
High Safety
Multiple interlock monitoring and explosion-proof protection mechanisms eliminate operational risks and meet the strict safety standards of Chinese manufacturing enterprises.
Multi-industry Application Cases in China
In addition to the benchmark printing project of China National Stamp Printing Factory, CADAIR VOCs treatment equipment and technologies have been widely used in multiple industrial fields across China, serving a large number of well-known Chinese enterprises.
Printing & Ink Industry (China)
- China National Stamp Printing Factory
- DIC Ink (China)
- Qimiao Printing (China)
- Global Printing (China)
Automotive Manufacturing (China)
- Volvo Cars (China)
- Leapmotor (China)
- Multiple automotive coating workshop VOCs treatment projects
Shipbuilding & Marine Engineering (China)
- Shanghai Waigaoqiao Shipbuilding (China)
- Large ship surface treatment and spraying line waste gas treatment projects
Chemical & New Materials (China)
- Yikai New Materials (China)
- Lianlong Chemical (China)
- Magnequench (China)
Carbon Fiber Manufacturing (China)
- Zhongfu Shenying (China)
- Heli Chemical (China)
Petroleum & Energy Industry (China)
- China National Petroleum Corporation (CNPC)
- China National Offshore Oil Corporation (CNOOC)
- China Petrochemical Corporation (Sinopec)
Semiconductor Industry (China)
- ASML
- BOE (China)
- OFILM (China)
- Huahai Qingke (China)
- Corevision (China)
Frequently Asked Questions
1. What is the best VOCs treatment technology for China’s printing industry?
For the typical large-air-volume and low-concentration waste gas of China’s printing industry, the Zeolite Rotor Concentration + CO Catalytic Oxidation combined process is the most efficient, energy-saving and stable treatment solution.
2. What are the common VOC pollutants in printing plants?
Typical pollutants include ethyl acetate, isopropanol, acetone, butyl acetate and other non-methane volatile organic compounds.
3. What VOC removal efficiency can CADAIR’s system achieve?
Standard industrial systems can reach over 95%, while the CADAIR project at China National Stamp Printing Factory maintains a stable purification efficiency of over 98% in long-term operation.
4. How long can a catalytic oxidation VOCs system operate stably?
With professional design and standardized operation, the system can operate continuously for many years. The China National Stamp Printing Factory project has verified stable operation for more than 3,350 days, proving excellent long-term reliability.
Conclusion
The China National Stamp Printing Factory VOCs treatment project fully demonstrates the outstanding long-term reliability, ultra-high purification efficiency and excellent environmental performance of CADAIR’s Zeolite Rotor + CO Catalytic Oxidation technology.
With 3,350+ days of uninterrupted stable operation, over 98% VOC removal rate, and mature and verified application experience in printing, automotive, shipbuilding, chemical, carbon fiber and semiconductor industries in China, CADAIR continues to deliver high-quality, energy-saving and stable VOCs treatment solutions, helping Chinese industrial enterprises achieve environmental compliance and sustainable green development.
