Stainless Steel Alkali Scrubber Tower

Product Overview

The stainless steel alkali scrubber tower is a wet neutralization vessel used to remove acidic pollutants from industrial exhaust gas by alkaline washing. It is also called an alkali washing tower, caustic scrubber, acid gas scrubber, alkaline spray tower or neutralization tower.

Exhaust gas enters the tower from the bottom or side and flows upward through the spray and packing section. Alkaline absorption liquid such as NaOH or Na₂CO₃ solution is sprayed from the top, forming a liquid film on the packing surface. Acidic components such as HCl, SO₂, HF, H₂S and acid mist are neutralized through gas-liquid contact, and the purified gas passes through a demister before discharge.

Stainless steel construction provides higher mechanical strength, better temperature resistance and longer service life than plastic or FRP towers, especially for continuous operation, larger diameters, elevated temperatures or wet corrosive environments.

Why Stainless Steel Alkali Scrubber Tower

Although the scrubbing liquid is alkaline, the internal environment of an alkali scrubber tower is often wet, corrosive and complex. Acid mist carryover, chloride ions, temperature fluctuation and gas-liquid interface zones can cause pitting, crevice corrosion or stress corrosion cracking, especially when 304 stainless steel is used in high-chloride conditions.

Stainless steel alkali scrubber towers offer better structural stability than plastic towers and better corrosion resistance than carbon steel. They are suitable for chemical plants, petrochemical units, electroplating lines, acid pickling systems, semiconductor facilities and industrial exhaust gas treatment where long-term reliability is required.

Structure & Working Principle

The alkali scrubber tower is a vertical cylindrical vessel made of stainless steel, with gas inlet, gas outlet, inspection door, drain connection and supporting structure. Exhaust gas flows through the tower while alkaline liquid is circulated by a pump and sprayed through nozzles.

Inside the tower, the packing layer increases gas-liquid contact area and improves absorption efficiency for acidic gases. The demister section removes entrained droplets from purified gas to reduce carryover and downstream corrosion. The circulation tank collects alkaline liquid for reuse, with optional pH monitoring and automatic dosing system to maintain stable neutralization performance.

Typical Specifications

The tower is manufactured from stainless steel in vertical alkali scrubber or alkali washing tower configuration. Diameter is typically customized between 800 mm and 4000 mm, and height is determined according to packing height, spray stages and site conditions. Wall thickness is generally designed between 2 mm and 4 mm depending on diameter, structural load and process requirements.

Internal parts include packing, spray nozzles, demister, circulation pump, alkali dosing system, piping and supporting structures. Exact dimensions, number of spray layers, packing type and connection configuration should be determined according to gas volume, acid gas concentration, temperature, humidity and installation conditions.

Typical Applications

Stainless steel alkali scrubber towers are widely used in chemical plant acid gas treatment, petrochemical regeneration system off-gas washing, electroplating and metal surface treatment exhaust, pickling line HCl and HF gas absorption, semiconductor and electronic manufacturing acid gas neutralization, pharmaceutical and food industry exhaust gas treatment, waste incineration flue gas washing, metallurgical and sintering flue gas pretreatment, as well as wet desulfurization polishing systems. They can also be arranged upstream of WESP systems, activated carbon adsorbers or RTO units to reduce acid mist, dust and moisture load before downstream polishing.

Manufacturing & Company Strength

Wuxi Xinchangyuan Equipment Manufacturing Co., Ltd. specializes in the design and manufacture of stainless steel alkali scrubber towers, absorption towers, spray towers, wet scrubbers, wet electrostatic precipitators, anode modules and anode tube bundles. Our facility is equipped with plate rolling, laser cutting, CNC forming, automatic welding, surface treatment and module assembly capabilities, supporting both standard and customized stainless steel process equipment for industrial exhaust gas treatment.

We provide engineering support from material selection and structural design to fabrication, assembly and installation guidance. Each alkali scrubber tower is manufactured according to project gas composition, acid gas load, temperature, corrosion level and site layout. Our team can integrate alkali scrubber towers with wet electrostatic precipitators, demisters, circulation systems and exhaust gas purification lines, helping industrial customers achieve stable emission performance and reliable long-term operation.

FAQ

What is a stainless steel alkali scrubber tower used for?
It is used to neutralize and remove acidic pollutants such as HCl, SO₂, HF, H₂S, acid mist and other acid gases from industrial exhaust gas through alkaline wet scrubbing.

When should 304 be upgraded to 316L, 2205 or 254SMO?
If the exhaust gas contains chloride ions, acid mist carryover, high humidity or long-term wet corrosion, 316L or higher-grade stainless steel is usually more reliable than 304.

Can the alkali scrubber tower be customized?
Yes. Tower diameter, height, wall thickness, packing type, spray layers, demister and alkali dosing system can be customized according to actual process conditions.

Can it be used together with a WESP system?
Yes. An alkali scrubber tower can be arranged upstream of a WESP to reduce acid mist, dust and moisture load, helping the downstream polishing system operate more stably.

Tel：+86 13656199922

Phone：+86 13656199922

Email：wxxcysbzzyxgs@163.com

Address：35-3 Yanqiao Road, Yanqiao Street, Huishan District, Wuxi City, Jiangsu Province, China