| • Hanging chain spray room | |
| Continuous operation exhaust gas | benzene series concentration is stable at 200–400 mg/m³, paint fog load 1–3 g/m³ (D50=10–20 μm) |
| Pollutant characteristics | epoxy primer containing bisphenol A (0.5–1.2%), polyurethane top paint containing free TDI (2–5 ppm) |
| • Independent spray drying room | |
| Intermittent emission characteristics | the peak VOCs of the spraying stage is 800–1,200 mg/m³ (lasting 20–30 min), and the drying stage maintains 300–500 mg/m³ |
| Influence of temperature change | the exhaust gas temperature rises from normal temperature to 80 ℃ (temperature rise rate >15 ℃/min), and the relative humidity fluctuates by 30–95% |
| • Mobile spraying unit | |
| Multi-component mix | Metal primer with zinc powder (15–25%) and alkyd resin solvent (40–60% xylene) |
| Irregular discharge | daily working time 1–4 h, air volume variation range 5,000–20,000 m³/h |
