A fiberglass-reinforced plastic (FRP) scrubbing tower is an environmental protection device that utilizes a liquid (usually water or a chemical absorbent) to contact polluted exhaust gases, thereby removing pollutants (such as dust, acidic gases, alkaline gases, and organic waste gases).
The fiberglass flushing tower extends Weitong FRP's manufacturing expertise beyond our core FRP Storage Tanks line into industrial gas treatment equipment. While our storage tanks are built to safely hold liquids, the fiberglass flushing tower applies the same corrosion-resistant winding and lamination technology to a different purpose: bringing liquid into direct contact with polluted waste gas to remove harmful pollutants before discharge.
Its core working principle is: gas-liquid mass transfer.
Exhaust Gas Inlet: Exhaust gas containing pollutants enters the tower from the lower portion.
Reverse Contact: Exhaust gas flows upward while absorbent liquid is sprayed downward through a spray system at the top of the tower.
Mass Transfer Process: Exhaust gas and absorbent liquid come into full, turbulent contact within the packing layer. Pollutants (such as SO₂, HClNH₃, etc.) diffuse from the gas phase into the liquid phase, where they are absorbed or chemically react.
Gas-Liquid Separation: The purified gas continues to rise, passes through a demister to remove entrained liquid droplets, and is then discharged from the top of the tower.
Liquid Recirculation/Discharge: The liquid that has absorbed pollutants descends to the bottom of the tower, where some is recycled and some is discharged as wastewater for treatment.
This is precisely the advantage of FRP
Excellent Corrosion Resistance (The Most Critical Advantage)
Industrial waste gas often contains highly corrosive components such as acids, alkalis, and salts (such as sulfuric acid mist, hydrogen chloride, and hydrogen fluoride). FRP, especially when made with vinyl ester or epoxy resin, is highly resistant to these media, with a lifespan far exceeding that of carbon steel (even carbon steel with an internal anti-corrosion coating is susceptible to damage).
Lightweight and High Strength
Lightweight makes it easy to transport and install, making it particularly suitable for installation on rooftops. Its high strength provides excellent structural stability.
Monolithic Molding with No Welds
This eliminates the risk of weld cracking, as is common with plastic products, and also prevents electrochemical corrosion at metal welds.
Smooth Interior
Low fluid resistance and resistance to fouling, reducing clogging and the need for cleaning and maintenance.
Flexible Design
Tower size, number of spray stages, and filler type can be flexibly designed based on parameters such as the air volume being processed and the type of pollutants.
Industrial waste gas often contains highly corrosive components such as sulfuric acid mist, hydrogen chloride, and hydrogen fluoride — conditions that degrade carbon steel far faster than fiberglass reinforced plastic:
Superior corrosion resistance — vinyl ester and epoxy resin systems withstand acidic, alkaline, and saline waste gas streams with a service life far exceeding steel, even steel with internal anti-corrosion lining
Lightweight, high-strength construction — easier to transport and install, including rooftop and elevated installations where structural load is a concern
One-piece winding, no weld joints — eliminates the weld cracking risk found in welded plastic or metal towers, and avoids the electrochemical corrosion that occurs at metal weld seams
Smooth interior surface — low flow resistance reduces scale buildup and lowers the frequency of cleaning and maintenance
Flexible design — tower diameter, number of spray layers, and packing type can all be configured to match the specific air volume and pollutant type being treated
Flushing towers are typically classified by the waste gas they are designed to treat, each requiring a different absorption liquid and working mechanism:
Acid Mist Purification — treats HCl, H₂SO₄, HNO₃, and HF using NaOH or Na₂CO₃ solution through acid-base neutralization, commonly used in chemical processing, electroplating, and pickling operations
Alkali Mist Purification — treats NH₃ and NaOH mist using dilute acid solutions, applied in fertilizer, petrochemical, and wastewater treatment facilities
Organic Waste Gas Scrubbing — removes dust-containing soluble organic vapors through physical absorption using water or compatible solvents, suited to spraying, printing, and food processing operations
Dust Removal and Cooling — uses water spray to cool and remove particulate matter from high-temperature flue gas, commonly applied to boiler flue gas systems
Weitong FRP configures each fiberglass flushing tower to the specific gas composition, flow rate, and pollutant concentration of your project:
● Tower diameter and height sized to the required air volume and treatment target
● Resin systems selected for compatibility with the specific corrosive medium, including vinyl ester and epoxy options
● Internal packing options including Raschig ring, Pall ring, and saddle ring configurations
● Operating temperature and pressure ranges matched to your process conditions
● Custom nozzle, flange, and access point placement for maintenance and inspection
Hebei Weitong FRP Co., Ltd. has manufactured fiberglass reinforced plastic products since 2015, operating a 20,000-square-meter production base with 11,000 square meters of dedicated workshops. As a certified fiberglass flushing tower manufacturer holding ISO9001, ISO14001, and ISO45001 certifications, every tower we produce is verified on our high-specification pressure testing platform and cured in BPO curing ovens under the same quality controls applied across our full FRP product range.
Our fiberglass towers have supported qualified partners including CNPC, Sinopec, CNOOC, Huaneng Group, and Beijing Enterprises Water Group on desulfurization wastewater and zero-discharge treatment projects, and we export FRP equipment to the United States, Germany, Italy, Russia, Pakistan, South Korea, and dozens of other countries worldwide.
For projects where the collected liquid from a flushing tower still contains a high volume of low-concentration pollutants requiring further volume reduction, Weitong FRP also manufactures a fiberglass concentration tower as an advanced follow-on stage to the flushing process.
To receive an accurate design recommendation, please share your waste gas composition, concentration, flow rate, and temperature with our engineering team. Contact us to discuss your fiberglass flushing tower requirements, or explore our other FRP storage tank configurations, including vertical, horizontal, and pressure storage tanks.
Types and Applications
Based on the nature of the waste gas being treated, scrubbing towers are primarily categorized as follows:
| Type | Acid mist purification tower | Alkali mist purification tower | Organic waste gas scrubber | Dust removal and cooling tower |
| Processing objects | HCl, H₂SO₄, HNO₃, HF, etc. | NH₃, NaOH mist, etc. | Dust-containing and soluble organic waste gas | High-temperature flue gas, dust |
| Absorption liquid | NaOH solution, Na₂CO₃ solution | Dilute acid solution (e.g., sulfuric acid) | Water, or specific chemical solvents | Water |
| Working principle | Acid-base neutralization | Acid-base neutralization | Physical absorption, dissolution | Cooling, humidification, dust removal |
| Application Industries | Chemical, Electroplating, Pickling, Semiconductor | Fertilizer, Petrochemical, Wastewater Treatment | Spraying, Printing, Food Processing | Boiler Flue Gas |
Summary:
Fiberglass-reinforced plastic (FRP) scrubbing towers are one of the most economical and effective technologies for treating industrial acidic/alkaline waste gases and water-soluble pollutants. Leveraging the corrosion resistance of FRP, they purify waste gases through mass transfer within the packing layer and the chemical action of the spray liquid. When selecting a system, it's crucial to clearly define the waste gas composition, concentration, temperature, and volume for precise design and selection, ensuring compliance with emission standards.
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