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Industrial Volatile Organic Compounds Control

FAW-Volkswagen Coating Workshop VOCs Treatment Project

In the painting process of automobile manufacturing, energy consumption accounts for about 70% of the total energy consumption in vehicle production, while the wastewater, waste gas, and waste residue (the three wastes) generated in the painting workshop exceed 85% of the entire automobile production process, with volatile organic compounds (VOCs) emissions being particularly prominent. In addition, spraying operations also produce paint mist, organic solvent vapors, and dust, causing significant environmental pollution. To ensure the safety and health of employees and to ensure that waste gas emissions comply with strict environmental protection standards, the FAW-Volkswagen Chengdu plant has implemented ultra-low emission modifications to its waste gas treatment facilities in the painting workshop. This renovation not only upgraded the existing waste gas treatment system but also installed more scientific and efficient process ventilation equipment to ensure that emissions continuously and stably meet the specified standards while improving the system's energy efficiency.

Sources and parameters of waste gas
Main source: Organic solvent waste gas from painting + intermediate drying process
Waste gas components: Benzene, toluene, ethyl acetate, etc.
Waste gas flow rate: 150,000 m³³/h

Overview of the Megaunity solution

This project has undergone comprehensive optimization based on the existing waste gas treatment system (based on rotary adsorption and TNV technology), not only incorporating the waste gas from the painting room and intermediate drying furnace into the treatment scope but also ensuring that emissions meet environmental protection standards while meeting customer requirements for energy-saving effects and equipment quality. The following are specific improvement measures:

1. Pre-treatment filtration system:The newly added pre-treatment filtration system effectively reduces the entry of impurities such as particulate matter into the zeolite rotary wheel, thereby extending its service life.

2. Intelligent rotary wheel system:This system is designed with an automatic concentration ratio adjustment function, which can flexibly adjust the desorption air volume according to the intake and exhaust concentrations during single-line or multi-line production, achieving energy-saving operation. In addition, the rotary wheel system is equipped with an automatic fire protection system and high-temperature cleaning function to ensure safe operation and the adsorption regeneration capability of the wheel.

3. Intelligent control system:The integrated control system can dynamically monitor and automatically control the operation of the entire system, automatically generate reports, and automatically match the appropriate air volume according to the actual needs of the production line, ensuring energy-saving operation.

4. Multi-stage waste heat recovery technology:The TNV system adopts a multi-stage waste heat recovery process, including waste gas preheating, rotary wheel desorption heat exchange, and hot water heat exchange, maximizing energy utilization through efficient thermal energy recovery technology.

5. Self-optimized process ventilation design:Megaunity has the capability to independently design and optimize process ventilation, and the modified system has been re-tuned for air balance, allowing for quick responses to changes in production demand.

6. Zero-leak emergency discharge pipeline:Equipped with zero-leak valves independently developed by Megaunity, this solution addresses potential leakage issues in the emergency discharge pipeline of the positive pressure air supply system, ensuring the stability and compliance of the system.

7. High-quality patented technology:Megaunity holds multiple patents related to duct valves in the painting workshop, ensuring process quality while also guaranteeing the appearance and other added values of the products, such as duct sealing and aesthetics, all meeting the high standards required by customers for project quality.

Effective and reasonable system design is fundamental to controlling workshop air quality and ensuring a good working environment. Megaunity has accumulated nearly thirty years of profound experience in the field of industrial production environment air systems, helping customers achieve the goals of reducing investment costs, lowering operating expenses, improving energy efficiency, and reducing carbon emissions through source capture of waste gas, refined system design, independent innovation of key components, and optimization of process technology. Megaunity provides customers with safe and efficient full-system solutions, committed to promoting the green and sustainable development of the automotive painting industry.

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Industrial Air Handling System Solutions Provider

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E-mail： marketing@megaunity.com

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