Waste Gas Emissions during the Production of Mobile Phone Screen Protectors
Briefly describe the characteristics of waste gas emissions during the production process of mobile phone screen protectors.
Waste Gas Emissions during the Production of Mobile Phone Screen Protectors
The coating and drying processes in mobile phone screen protector production release large amounts of organic waste gas, characterized by large volume, low concentration, complex composition, presence of viscous substances, and intermittent emissions.
Waste Gas Emission Characteristics
Features | Description |
Large air volume, low concentration | Exhaust volume ranges from tens of thousands to hundreds of thousands of m³/h, VOCs concentration is typically 200-1000 mg/m³ |
Large concentration fluctuations | Different products use different amounts of adhesives, leading to concentration fluctuations during material addition and production changes |
Complex composition | Contains esters, ketones, benzene compounds, alcohols, etc. |
Contains sticky substances | VOCs combine with dust, easily clogging pipes and equipment |
Intermittent emissions | Batch production, frequent start-ups and shutdowns |
Major pollutants
Types | Components |
Benzene Compounds | Benzene, Toluene, Xylene |
Esters | Ethyl Acetate, Butyl Acetate |
Ketones | Butanone, Acetone |
Butanone, Acetone | Isopropanol |
Treatment Requirements
Emission Standards: Comply with GB 16297 and GB 37822; non-methane total hydrocarbons in key areas ≤70mg/m³
Treatment Efficiency: Total VOCs removal rate ≥90%; ≥95% in key areas
Explosion-proof Safety: The waste gas treatment system must be explosion-proof (explosion-proof fans, pipeline grounding, LEL online monitoring)
Common Treatment Technologies
Concentration Range | Recommended Technology |
High Concentration (>2000 mg/m³) | RTO |
Medium Concentration (500-2000 mg/m³) | Adsorption Concentration + RTO/Catalytic Combustion |
Low Concentration (<500 mg/m³) | Activated Carbon Adsorption |
Typical configuration: Spray tower (cooling and dust removal) → Dry filtration → Activated carbon adsorption → Exhaust fan → Emission
Treatment challenges and countermeasures
Challenges | Solutions |
Large air volume, low concentration | Use a concentrator/activated carbon adsorption + small-scale RTO |
Large concentration fluctuations | Install a buffer tank, online LEL monitoring, and automatic fan adjustment |
Containing viscous substances | Pre-treatment with front-end filtration or spraying |
Intermittent emissions | Select equipment with rapid start-stop capability |
Explosion-proof requirements | Pipeline grounding, explosion-proof fans, flame arresters |
Summary
The treatment of waste gas from mobile phone film production requires the selection of routes based on concentration, as well as front-end pretreatment, explosion-proof design and intermittent emission response. The emission limit of non-methane total hydrocarbons in key areas is ≤70mg/m³, and the total removal rate must reach 90%-95%.