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How to Choose Between PP, FRP, and Stainless Steel Spray Towers? A Comparison of Materials and Operating Conditions

Industrial Exhaust Gas Treatment Equipment

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How to Choose Between PP, FRP, and Stainless Steel Spray Towers? A Comparison of Materials and Operating Conditions

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Spray towers can be constructed from materials such as polypropylene (PP), fiber-reinforced plastic (FRP), or 304/316L stainless steel. When selecting a material, one must consider not only the exhaust gas temperature but also the composition of the pollutants, their corrosivity, the operating environment, and maintenance requirements. Typical temperature limits for these materials are: PP ≤ 80°C, FRP ≤ 120°C, and stainless steel ≤ 300°C; however, the actual upper limit for a specific application should be determined based on the specific media, equipment design, and operating conditions. Before finalizing the material, it is advisable to compile detailed information regarding the exhaust gas composition, temperature, and on-site operating conditions, and then consult with the equipment supplier to verify the appropriate tower material and configuration—avoid selecting materials based on a single parameter alone.

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How should a spray tower be maintained?

Equipment maintenance involves the inspection and replacement of components such as access manholes, packing, and spray nozzles. The management of circulating fluid, chemical dosing, and cleaning intervals should be determined based on the specific exhaust gas conditions and the operational status of the equipment.

What is the purification efficiency of a spray tower?

The reference values ​​provided in the product documentation indicate an efficiency of ≥95% for the purification of acidic/alkaline exhaust gases, and an efficiency of ≥99% for the removal of liquid droplets larger than 10 μm. Actual performance may vary depending on the specific pollutants, absorption liquid, operating parameters, and testing conditions; therefore, project-specific design specifications and test results should be taken as the definitive criteria.

What is the treatment air volume range for a spray tower?

The product documentation specifies an operating air volume range of 500–100,000 m³/h. The specific model should be selected based on the required air volume, the composition and temperature of the exhaust gas, and the specific treatment requirements.

What materials are available for spray towers, and what is their temperature range?

Available material options include PP, FRP (fiber-reinforced plastic), and 304/316L stainless steel. Reference temperature ranges are as follows: PP ≤ 80°C, FRP ≤ 120°C, and stainless steel ≤ 300°C. The actual upper operating limit must be determined based on the specific medium, its corrosivity, and the equipment design.

Can a spray tower handle VOCs?

Spray towers can be used for the pretreatment of certain water-soluble VOCs; however, this does not imply that they are capable of treating all types of VOCs on their own. The actual effectiveness must be evaluated based on the specific types and concentrations of the VOCs, as well as the subsequent treatment processes.

What types of acidic or alkaline gases can a spray tower handle?

The substances listed as applicable include HCl, HF, NH₃, H₂SO₄ acid mist, and NOx. As different gases require different absorption liquids and operating conditions, the design scheme should be determined based on the actual composition of the waste gas.

What is the working principle of a spray tower?

Exhaust gas enters the lower part of the tower and flows upward, while the absorbing liquid is sprayed from the top and flows downward. As the gas and liquid come into contact within the packed section, pollutants are captured by the absorbing liquid; the purified gas then passes through a mist eliminator to remove any entrained droplets.

What kind of waste gas are spray towers primarily used to treat?

Spray towers are primarily used for treating acidic or alkaline gases, water-soluble pollutants, and for the pre-treatment of certain dust-laden exhaust streams. Their suitability for specific pollutants must be determined by considering the composition and concentration of the exhaust gas, as well as the choice of absorption liquid.

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