Columnar activated carbon (diameter 3-8mm, length 5-20mm) has become the preferred adsorption material for continuous treatment of industrial waste gas due to its high mechanical strength and low pressure drop characteristics. This article combines engineering cases to explain its technical parameters and engineering practice in detail.
1. Technical advantages of columnar activated carbon
Parameters Comparison of granular carbon Application value
Bed pressure drop Reduced by 40-60% Suitable for large air volume treatment (> 50,000 m³/h)
Abrasion resistance > 98% completeness Adapt to vibration conditions (such as chemical plants)
Effective adsorption cycle Extended by 30-50% Reduce replacement frequency
Regeneration convenience Steam purge regeneration Recycled 5-8 times
II. Core selection parameters
Physical and chemical indicators
Iodine adsorption value: ≥1000mg/g (treating benzene series)
Carbon tetrachloride adsorption rate: ≥65% (non-polar VOCs)
Bulk density: 450-550kg/m³ (guaranteed adsorption capacity)
Ash content: <8% (food and pharmaceutical industry requires <3%)
Engineering parameters
Empty tower flow rate: 0.2-0.5m/s (anti-ditch flow)
Filling height: 1.2-2m (>90% adsorption efficiency)
Temperature and humidity requirements: 20-40℃, RH <60%
Typical case analysis
Case 1: Toluene waste gas treatment in chemical plants
Waste gas parameters:
Air volume 80000m³/h, toluene concentration 300-800mg/m³, containing a small amount of H₂S
System configuration:
Pretreatment: alkali washing tower ( Removal of H₂S＞95%)
Adsorption tower: Φ3.2m×6m double tower, loaded with Φ4mm columnar carbon (iodine value 1100mg/g)
Desorption system: 0.3MPa steam, condensation recovery of toluene
Operation effect:
Outlet concentration <20mg/m³ (meeting GB16297)
Annual recovery of toluene 520 tons (valued at ￥7.8 million)
Activated carbon replacement cycle 14 months
Case 2: Treatment of isopropyl alcohol waste gas in electronics factory
Challenges:
Waste gas concentration fluctuates greatly (50-1500mg/m³), containing siloxane aerosol
Solution:
Pretreatment: three-stage filtration (G4+F7+activated carbon cotton)
Adsorption tower: modular design, pressure drop is only 800Pa
Intelligent control: PID online monitoring to adjust air volume
Results:
Removal rate＞97%, annual VOCs reduction 65 tons
System energy consumption <0.2kWh/m³
