Industrial Wet Scrubber Systems

Industrial Wet Scrubber Systems for Corrosive Exhaust Treatment

Industrial wet scrubbers remove 95-99% of acid gases, VOCs, and particulates from exhaust streams through direct gas-liquid contact. According to the EPA Wet Scrubber Cost Manual, a properly designed packed bed scrubber achieves the highest removal efficiency per unit of pressure drop among all wet scrubbing technologies. XICHENG EP has manufactured PP wet scrubbers for 15+ years, shipping 2,600+ systems to 60+ countries.

Scrubber Type	Best For	Efficiency	Pressure Drop
Packed Bed (Counter-Current)	Acid gases: HCl, HF, H2SO4, HNO3, SO2	95-99%	200-500 Pa/m
Spray Tower	Particulate + water-soluble gases	85-95%	100-250 Pa
Horizontal Cross-Flow	Space-constrained, moderate efficiency	90-97%	150-350 Pa
Multi-Stage	Mixed pollutants: acid + VOC + particulate	95-99.5%	300-800 Pa

Why choose PP over FRP or stainless steel?

PP wet scrubbers deliver 15-20 year service life treating corrosive exhaust, vs 5-7 years for FRP and 2-5 years for 316L stainless. PP is chemically inert to HCl, HF, H2SO4, and NaOH at operating temperatures up to 90 C. A PP scrubber costs 30-50% less upfront than FRP and 60% less than alloy steel, with zero internal coating renewal or corrosion patching required. See our PP vs FRP Scrubber comparison and cost savings analysis.

How is a wet scrubber sized?

Scrubber diameter = gas flow rate / design velocity (0.8-1.5 m/s through packed bed). Bed depth uses NTU/HTU method based on target removal efficiency and pollutant Henry’s Law Constant. Example: 20,000 m3/h exhaust with HCl at 500 mg/m3 requiring 99% removal needs a 1.8m diameter scrubber with 3.0m structured packing at L/G = 2.5 L/m3. See our sizing calculation guide and NTU/HTU efficiency guide.

Target pollutants matched to scrubbing chemistry

Pollutant	Scrubbing Medium	Industry Source
HCl	NaOH (pH 7-9)	Chemical processing, semiconductor etch
HF	NaOH or KOH	Glass etching, aluminum processing
SO2	NaOH / Lime / Limestone	Coal boilers, smelting, sulfuric acid plants
NH3	H2SO4 or H3PO4	Fertilizer, refrigeration
Cl2	NaOH (20% solution)	Water treatment, chemical synthesis
VOCs	Water + oxidation agent	Paint, pharmaceutical, solvent use

Frequently Asked Questions

What airflow rates can PP wet scrubbers handle?

Standard models cover 500 to 215,000 m3/h. Custom designs for larger flows. Multi-fan configurations available for very high volumes.

What maintenance does a PP wet scrubber require?

Monthly: check spray nozzle pattern, packing condition, pH probe calibration. Quarterly: inspect mist eliminator, recirculation pump. Annual: full internal inspection. PP scrubbers require no internal coating renewal, unlike FRP. See our maintenance guide.

Can one scrubber handle multiple pollutants?

Yes. Multi-stage scrubbers combine acid gas scrubbing (stage 1) with VOC adsorption (stage 2) and particulate removal (mist eliminator). Common in chemical plants and pharmaceutical facilities. See our chemical plant treatment guide.