In high-humidity chemical workshops, the duct design of industrial dehumidifiers must focus on three key areas: optimizing airflow organization, improving heat and moisture exchange efficiency, and ensuring corrosion resistance and ease of maintenance. This approach aims to achieve comprehensive improvement in dehumidification uniformity through structural innovation and detailed optimization. Traditional duct designs often cause localized excess humidity due to air short-circuiting and inadequate heat and moisture exchange. The corrosive environment of chemical workshops places even strict demands on material durability, necessitating systematic optimization in duct layout, component selection, and corrosion protection.
The rationality of duct layout directly impacts airflow uniformity. Chemical workshops typically have large spaces and complex equipment layouts. Using a single air outlet for centralized air supply can easily lead to a rapid drop in humidity near the plant and humidity stagnation at the plant's far end. Therefore, the duct system should adopt a "multi-point distributed air supply + centralized return air" model. By evenly distributing multiple adjustable diffusers on the ceiling or side walls, dry air is dispersed in a low-speed laminar flow pattern, minimizing vortices and dead spots. For example, maintain a spacing of 5-8 meters between air outlets and adjust the air supply angle based on the equipment layout to ensure airflow penetrates equipment gaps and covers the entire work area. Return air vents should be centrally located high on the workshop ceiling or side walls, leveraging the natural rise of hot air to accelerate moisture removal and create a three-dimensional "downward delivery and upward return" circulation.
The design of key components in the air duct structure must balance efficiency and durability. As the power source, use corrosion-resistant centrifugal or axial fans, with impellers and casings made of fiberglass or 316L stainless steel to prevent performance degradation caused by corrosive gases. Air outlets should avoid direct airflow onto walls or equipment to prevent excessive localized wind speeds that could cause dust to rise and uneven material drying. Louvered or perforated air outlets can be used to disperse the airflow and reduce localized wind speeds. Deflectors can also be used to guide the airflow, ensuring even coverage of the work area with dry air. A primary filter should be installed at the return air inlet to intercept large dust particles and fibers, preventing them from entering the industrial dehumidifier and affecting heat exchange efficiency. The filter should be quick-release for easy regular cleaning and replacement.
Improving heat and moisture exchange efficiency depends on the coordinated design of the air duct and industrial dehumidifier. Traditional duct systems often cause localized overload of the evaporator due to uneven air speeds, resulting in alternating "cold" and "hot" zones. By adding flow equalizers or rectifiers to the duct, the airflow can be broken down into multiple parallel streams, reducing turbulence that interferes with heat exchange. For example, a honeycomb rectifier can be installed at the front of the evaporator to ensure a uniform airflow through the fin gaps, improving condensate extraction efficiency. Furthermore, flexible sealing sleeves should be used at the connection between the air duct and the industrial dehumidifier to prevent air leakage and vibration noise caused by rigid connections. The sealing material should be corrosion-resistant silicone or fluororubber to ensure long-term resistance to aging and cracking.
Corrosion protection is a special requirement for duct design in chemical workshops. The interior of the duct should be sprayed with epoxy resin or polyurethane anti-corrosion coating to a thickness of at least 200μm, forming a dense protective layer to isolate corrosive gases. For ducts conveying acidic and alkaline vapors, PVC or PP plastic linings can be installed on the interior walls, as they offer superior chemical corrosion resistance to metal. Duct supports and hangers should be made of hot-dip galvanized steel pipe or stainless steel to prevent structural damage due to corrosion. Large-radius arc transitions should be used at duct bends and diameter changes to reduce airflow resistance and prevent stress concentration that can cause metal fatigue cracking.
The maintenance accessibility of the duct system directly impacts long-term operational stability. The design should include ample inspection openings and cleaning doors, measuring at least 400mm x 400mm, to facilitate access for dust removal and filter replacement. The duct bottom should have a sloped drainage path toward a collection pan or drain pipe to prevent condensate accumulation and secondary corrosion. For horizontally laid air ducts, cleaning ports should be installed every 6 meters, equipped with quick-opening covers to facilitate regular vacuuming or high-pressure water jet cleaning of internal deposits. Furthermore, the duct system should be linked to an industrial dehumidifier and equipped with a differential pressure sensor. When duct resistance exceeds 15% of the initial value, an automatic alarm will sound, prompting maintenance personnel to check for filter blockage or structural deformation.
Scientific duct design is key to improving dehumidification uniformity in chemical plants. Through the integrated application of multi-point distributed air supply, key component optimization, coordinated heat and moisture exchange, anti-corrosion treatment, and maintainable design, uniform distribution of dry air and efficient heat exchange can be achieved, providing a stable and reliable humidity control environment for chemical production.
