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Coatings & Inks

Coatings & Inks

In the field of coating ink manufacturing, waste gas treatment is faced with “three many and three high” challenges: many emission source points (7 categories of 15+ pollution nodes), many types of components (involving 8 categories of 100+ organic matter), and many emission modes (continuous/intermittent/pulsed mixing); High concentration volatility (peak-to-valley ratio of 20:1), high toxicity hazards (half of the substance TLV30%).

Analysis of the Characteristics of Typical Emission Sources

• Material handling section
Feeding process powder raw material disperse (particle size distribution 0.1-50μm), solvent instantaneous volatilization (peak 800-1,200mg/m³)
Stirring process breathing waste gas containing unreacted monomer (butyl acrylate 50–200 mg/m³), including resin droplets (viscosity >1,000 cP)
• Storage and transportation section
Tank farm breathing gas temperature difference between day and night leads to small breathing emissions (air volume fluctuation 200–500 m³/h), containing C6–C12 alkanes (60–80%)
Sub-packing operation VOCs disperse at filling port (ethyl acetate concentration gradient 300-1,500mg/m³), instantaneous emissions account for 40% of the total
• Special pollution source
Laboratory ventilation the components of the experimental waste gas are complex, diverse in nature, and the average daily emission time is <4 h
Hazardous waste storage room organic waste liquid volatilization produces benzene series/aldehydes and ketones mixture (concentration background value 50–80 mg/m³)

Key treatment difficulties

Multi-component azeotropic effect
Instantaneous Concentration impact
Safety control bottleneck
Difficulty in working condition coordination

Construction path of CADAIR technical system

• Graded trapping system
💨 Dynamic Air Distribution
Air duct optimization based on pollution generation characteristics (pressure drop difference <50Pa)
🔒 Intelligent sealed device
Automatic induction opening and closing of the feed port (leakage rate <0.5%)

• Main treatment unit
🌀 VOCs concentration rotor
Designed and selected with strong anti-fluctuation capability
🔥 Combustion System
Catalytic oxidizer (CO), Regenerative Thermal oxidizer (RTO)
🧪 Emergency Adsorption Device
Activated carbon, breakthrough time >200h

• Intelligent interlocking control system
📡 Multi-source Emission Forecasting
Integrated production planning and meteorological data (forecast accuracy >90%)
🛠️ Dynamic Load Regulation
RTO combustion temperature and fan frequency linkage control (response time <20s)
🔥 Cascade Utilization of Thermal Energy
Reactor preheating (50% waste heat) + raw material drying (30% waste heat)

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