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How to Choose Gas-Collection Covers: FRP, PP, Stainless Steel, or Carbon Steel? Considerations Regarding Material and Operating Conditions

Industrial Exhaust Gas Treatment Equipment

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How to Choose Gas-Collection Covers: FRP, PP, Stainless Steel, or Carbon Steel? Considerations Regarding Material and Operating Conditions

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Gas-collection covers can be fabricated from materials such as FRP (fiber-reinforced plastic), PP (polypropylene), stainless steel (SS304/SS316L), or carbon steel with an anti-corrosive coating. Material selection should not be based solely on the material type or cost; rather, it requires a comprehensive assessment that considers factors such as exhaust gas temperature, humidity, acidity/alkalinity, corrosivity, the span of the cover, and load-bearing requirements. While the product documentation specifies an applicable temperature range of -20°C to 180°C, this represents the aggregate range across various material options; the specific operating temperature for any single material must be verified during the design phase. Clearly defining the on-site media, environmental conditions, and structural requirements—and subsequently determining the primary material, sealing method, and connection structure—will help ensure that the covers are well-suited to the actual operating conditions.

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What are the collection efficiency and applicable temperature range for the gas-collection cover plate?

Product documentation specifies a containment/collection efficiency of ≥98% and an applicable temperature range of -20°C to 180°C; the exact range depends on the specific material and operating conditions. Actual collection efficiency may be influenced by factors such as on-site sealing, negative-pressure system performance, the presence of openings, and installation quality. It is recommended to rely on project-specific design specifications and test results.

How should the material for a resin tank be selected?

Material selection must take into account the presence of acidic, alkaline, or corrosive components in the exhaust gas, as well as factors such as temperature, pressure, and chloride ion concentration. Carbon steel is a cost-effective option suitable for standard operating conditions. Whether stainless steel or 2205 duplex stainless steel is appropriate depends on the specific medium and corrosive environment; the general term "corrosion-resistant" is insufficient for making a final selection.

What are the materials and specifications for resin tanks?

The vessel can be constructed from carbon steel, 304 or 316L stainless steel, or 2205 duplex stainless steel; the internal screen assembly and vessel dimensions can be customized according to project requirements. The RG-500, RG-1000, and RG-1500 models listed have air handling capacities of 1,000, 3,000, and 5,000 m³/h, respectively. Operating pressures and material specifications vary by model; please refer to the finalized technical proposal for specific details.

Can the resin tank operate continuously?

Multiple vessels can be operated in an alternating sequence—integrating adsorption, desorption, and cooling stages—to meet the requirements for continuous operation. The number of vessels required and the switching cycle are determined based on the exhaust gas flow rate, the adsorption capacity of the resin, and the regeneration process.

How do resin tanks adsorb and recover organic solvents?

Organic waste gas enters the vessel and passes through a resin bed, where organic components are adsorbed by the macroporous resin, and the treated gas is then discharged. Once the resin becomes saturated, it can be regenerated by introducing steam or hot nitrogen; the desorbed solvents are subsequently recovered via condensation. Following desorption, the resin bed is cooled with water, and the vessel returns to the adsorption phase.

What are resin tanks primarily used for?

The resin vessel is packed with macroporous resin, designed for the adsorption of gaseous media. In exhaust gas treatment, it can be used for the adsorption and enrichment of organic waste gases, as well as for the recovery of organic solvents. Its specific applicability should be determined based on the composition of the waste gas and the type of resin used.

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