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Beijing North Vehicle Group – Painting Workshop VOCs Treatment (Zeolite Rotor + CO)

Project Overview

This is a waste gas treatment project for the painting workshop of Beijing North Vehicle Group. The exhaust gas is typical large-air-volume and low-concentration coating VOCs, mixed with paint mist, benzene series and volatile organic solvents. The original water curtain direct discharge process is upgraded to a complete advanced treatment system.

Core Parameters

  • Total treatment air volume: 60,000 m³/h
  • Inlet VOC concentration: 200 mg/m³
  • Discharge standard: ≤50 mg/m³
  • Operation mode: 24-hour continuous operation, 300 working days per year

Process Flow

Multi-stage Dry Filter → Zeolite Concentration Rotor → CO Catalytic Oxidizer → Plate Heat Exchanger → High-altitude Discharge

Pretreatment: Four-stage graded filters (G3/G4/F9) intercept paint mist and solid particles to prevent blockage of rotor micropores.

Concentration Unit: The hydrophobic zeolite rotor with a concentration ratio of 20:1 converts large-air-volume low-concentration waste gas into small-air-volume waste gas to reduce the load of subsequent equipment.

Catalytic Oxidation: The desorbed high-concentration gas enters the CO unit and is completely oxidized at 210~500°C with the action of noble metal catalyst.

Waste Heat Reuse: The plate heat exchanger recovers flue gas heat to supply heat for rotor desorption and cut down energy consumption.

Main Equipment

  • Multi-stage bag filter
  • Hydrophobic zeolite concentration rotor
  • CO catalytic combustion unit
  • Plate heat exchanger
  • Explosion-proof variable frequency fan
  • PLC automatic control system

Operation Performance

The VOC removal efficiency is over 90%, and all particulate indicators comply with DB11/1226-2015 (Beijing Local Standard). The incombustible zeolite material has a service life of 8~10 years with low failure rate. Equipped with multiple safety interlocks for over-temperature, over-pressure and fan fault.

Technical Highlights

  • The combination of graded filtration and hydrophobic zeolite solves the common problem of paint mist blockage in the coating industry
  • Integrated concentration and catalytic process balances treatment effect and operating cost with excellent energy-saving performance
  • The whole equipment adopts ExDIIBT4 explosion-proof grade and IP55 protection grade, which is suitable for hazardous areas of painting workshops