304 Stainless Steel Desulfurization Tower

Product Overview

The 304 stainless steel desulfurization tower is a wet flue gas desulfurization vessel used to remove sulfur dioxide, acid mist and other acidic pollutants from industrial exhaust gas. It is also called a stainless steel desulfurizer, SO₂ scrubber, flue gas desulfurization tower, FGD tower or wet desulfurization tower.

Flue gas enters the tower from the bottom or side and flows upward through the spray and packing section. Absorption liquid such as NaOH solution, lime slurry or other alkaline reagent is sprayed from the top, forming a liquid film on the packing surface. Sulfur dioxide and acidic components are absorbed and neutralized through gas-liquid contact, and the purified gas passes through a demister before discharge.

The tower body is made of 304 stainless steel, which provides higher structural strength, better temperature resistance and longer service life than plastic or FRP towers in mildly corrosive and elevated-temperature flue gas conditions.

Why 304 Stainless Steel Desulfurization Tower

304 stainless steel desulfurization towers are suitable for industrial flue gas desulfurization where the corrosive level is moderate and higher mechanical strength is required. Compared with plastic towers, 304 stainless steel offers better resistance to elevated temperature, higher structural stability and more reliable long-term performance under continuous operation.

The smooth inner surface of stainless steel helps reduce scaling and improves liquid distribution inside the tower. This supports stable SO₂ absorption efficiency, easier maintenance and consistent emission performance. The tower can be integrated with spray systems, packing layers, demisters, circulation tanks and pH dosing systems according to process requirements.

Structure & Working Principle

The desulfurization tower is a vertical cylindrical vessel made of 304 stainless steel, with gas inlet, gas outlet, inspection door, drain connection and supporting structure. Flue gas flows through the tower while absorption 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 SO₂ and acidic gases. The demister section removes entrained droplets from purified gas to reduce carryover and downstream corrosion. The circulation tank collects absorption liquid for reuse, with optional pH monitoring and dosing system to maintain stable neutralization performance.

Material Selection Guidance

304 stainless steel is a cost-effective option for desulfurization towers handling mildly corrosive flue gas with low chloride content. It provides good general corrosion resistance and stable mechanical strength, making it suitable for boiler, kiln and industrial exhaust gas desulfurization where wet corrosion is not severe.

For flue gas with high chloride ions, strong acid mist or long-term wet corrosion, 316L or 2205 stainless steel is usually more suitable. 316L offers better chloride resistance due to molybdenum content, while 2205 duplex stainless steel provides higher strength and excellent resistance to chloride pitting and stress corrosion cracking. Material selection should be based on SO₂ concentration, flue gas temperature, humidity, chloride concentration and expected service life.

Typical Specifications

The tower is manufactured from 304 stainless steel, SUS304 or 1.4301 grade, in vertical desulfurization tower or FGD 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, piping and supporting structures. Exact dimensions, number of spray layers, packing type and connection configuration should be determined according to flue gas volume, SO₂ concentration, temperature, humidity and installation conditions.

Typical Applications

304 stainless steel desulfurization towers are widely used in boiler flue gas desulfurization, kiln and furnace exhaust gas treatment, chemical plant SO₂ absorption, metallurgical and sintering flue gas purification, power plant and industrial heating system desulfurization, as well as acid gas removal in pharmaceutical, food and manufacturing plants. They can also be arranged upstream of WESP systems, activated carbon adsorbers or RTO units to reduce SO₂, 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 desulfurization 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 flue gas treatment.

We provide engineering support from material selection and structural design to fabrication, assembly and installation guidance. Each desulfurization tower is manufactured according to project flue gas composition, SO₂ load, temperature, corrosion level and site layout. Our team can integrate desulfurization 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 304 stainless steel desulfurization tower used for?
It is used to remove sulfur dioxide, acid mist and other acidic pollutants from industrial flue gas through wet scrubbing and chemical absorption.

When should 304 be upgraded to 316L or 2205?
If the flue gas contains high chloride ions, strong acid mist or long-term wet corrosion, 316L or 2205 is usually more reliable than 304.

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

Can it be used together with a WESP system?
Yes. A desulfurization tower can be arranged upstream of a WESP to reduce SO₂, 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