Printing Industry VOC Management Solution
The Yurcent regenerative thermal oxidizer (RTO) has become an indispensable tool in managing volatile organic compounds (VOCs) emitted by various printing enterprises. This technology is widely applied across a diverse range of industries, including plastic color printing for food packaging, pharmaceutical packaging materials, cigarette bag printing, PVC decorative printing materials, wine label printing, and woven bag printing. These sectors rely on advanced printing technologies that often involve the use of solvents and inks, which can release harmful VOCs into the environment.
Characteristics of waste gas:
Sources:
Organized emissions primarily come from drying ovens used in printing and laminating processes. These ovens are essential for drying inks and coatings, but they also release significant amounts of VOCs.
Unorganized emissions originate from the printing workshop and ink mixing areas. These areas are less controlled and can contribute to higher levels of unorganized emissions, which are more difficult to capture and treat.
Emission Components:
The primary components of these emissions include ethyl acetate, n-propyl acetate, butanone, isopropanol, ethanol, and propylene glycol methyl ether acetate. These compounds are commonly found in printing inks and solvents, and their release into the atmosphere can have adverse effects on air quality and human health.
Treatment Process:
The integrated treatment process employed by Yurcent's RTO system is designed to address both organized and unorganized emissions comprehensively:
1. Capture of Unorganized Emissions: Specialized equipment is used to capture emissions from the printing workshop and ink mixing areas, ensuring that even unorganized sources are managed effectively.
2. Concentration Using a Zeolite Rotor System: The captured emissions are then concentrated using a zeolite rotor system, which significantly reduces the volume of air that needs to be treated while increasing the concentration of pollutants.
3. Reduction and Concentration of Organized Air Streams: For emissions from drying ovens, the system further concentrates the air streams, making the subsequent treatment more efficient.
4. Treatment Through the Rotary RTO: The concentrated emissions are then directed to the rotary RTO, where they undergo thermal oxidation at high temperatures, breaking down the VOCs into harmless byproducts like carbon dioxide and water vapor.
5. Recovery of Waste Heat for Energy Efficiency: To maximize energy efficiency, the system recovers waste heat generated during the oxidation process. This recovered heat can be reused in various ways, such as heating water, generating steam, or preheating incoming air streams, thereby reducing overall energy consumption.
Waste Heat Recovery Methods:
The waste heat recovery methods employed by the Yurcent RTO system include:
- Hot water recycling for use in other industrial processes
- Steam recycling for power generation or heating applications
- Hot air recycling to preheat incoming air streams, improving the efficiency of the RTO
- Heat transfer oil recycling for use in other heat-intensive processes
Concentration Range of Emissions:
The concentration of VOC emissions typically ranges from 400 mg/m³ to 5000 mg/m³, depending on the specific printing process and the type of inks and solvents used.
Emission Standards:
To comply with stringent environmental regulations, the system ensures that non-methane hydrocarbons (NMHC) emissions do not exceed 50 mg/m³. This level of control is crucial for maintaining air quality and protecting public health.
This comprehensive approach to VOC management not only ensures effective treatment of emissions but also optimizes resource utilization and adheres to strict environmental standards. By integrating advanced technologies and innovative waste heat recovery methods, the Yurcent RTO system provides a sustainable solution for the printing industry, helping companies reduce their environmental footprint while maintaining operational efficiency.