Pneumatic conveying double-walled pipes are engineered for the high-efficiency transport of dry, abrasive, or erosive bulk materials such as fly ash, cement, lime, coal powder, or plastic pellets through pressurized air systems. These pipes are composed of a reinforced outer steel shell and a wear-resistant internal liner, typically made of ceramic, basalt, or polymer materials, designed to withstand intense internal wear caused by high-velocity particle flow.
The double-wall construction separates the structural and wear-resistant roles:
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The outer steel pipe provides mechanical strength, pressure containment, and system integration.
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The inner liner offers excellent resistance to abrasion, erosion, and chemical attack.
Double-walled pipes are available in both
straight and
curved (elbow) sections, as well as in
tees, reducers, and junctions, ensuring full compatibility with complex pneumatic conveying layouts.
Pneumatic conveying is a method of transporting bulk materials through a pipeline using air or gas as the conveying medium. It is commonly used in industries such as food processing, chemical, pharmaceutical, and manufacturing, where materials like powders, granules, or pellets need to be transported efficiently and with minimal contamination.
The double-walled pipe design provides additional benefits such as improved insulation, reduced heat transfer, and protection against wear, especially when conveying abrasive or corrosive materials. It helps ensure the efficient and reliable transportation of materials while minimizing the risk of blockages or damage to the conveying system.
The pneumatic conveying double-walled pipe is designed to facilitate the transportation of bulk materials using air or gas as the conveying medium. It consists of two separate pipes, one inside the other, with an air or insulating gap between them.
During operation, the bulk materials, such as powders, granules, or pellets, are introduced into the inner pipe. Compressed air or gas is then introduced into the annular space between the two pipes. The high-velocity air or gas flow entrains the bulk materials, causing them to be suspended and carried along inside the inner pipe.
Pneumatic conveying is a technology used to transport solid materials through a closed pipeline using air or gas with a certain velocity and pressure. Dense-phase pneumatic conveying with a double-walled pipe is a positive pressure dense-phase pneumatic conveying technology that emerged in the mid-1980s. Its main characteristic is the installation of a smaller diameter inner pipe in the upper part of the conveying pipeline, with specially designed openings spaced at regular intervals.
When material blockage occurs at a certain point in the conveying pipeline, the pressure ahead of the blockage increases. High-pressure air flows into the inner pipe, and compressed air from the inner pipe exits through the openings downstream of the blockage at a higher velocity. This creates disturbance and clearance to the blocked material, ensuring the normal transportation of materials inside the pipe. The double-walled pipe design offers advantages such as improved insulation, wear protection, and reduced blockages, making it an efficient and reliable solution for the pneumatic conveying of solid materials in various industries.
Structure and Working Principle of Double-walled Pipe
Dual-walled Turbulent Pneumatic Conveying System used for the efficient transportation of solid materials through a pipeline using air or gas as the conveying medium. This system combines two key features:
Dual-walled Design: The system includes a pipeline with an inner pipe enclosed within an outer pipe, creating an air or insulating gap between the two pipes. This dual-walled structure provides several benefits, including improved insulation, reduced heat transfer, and protection against wear, especially when conveying abrasive or corrosive materials.
Turbulent Pneumatic Conveying: The system utilizes the characteristics of turbulent flow during the material transportation process. Turbulent flow is an irregular and chaotic movement of fluid, which allows for enhanced mixing and efficient transportation of solid materials within the pipeline.
The dual-walled turbulent pneumatic conveying system is commonly used in various industries, such as mining, cement, chemical processing, and food processing, where the transportation of bulk materials with minimal contamination and reduced wear is essential. It offers reliable and continuous material transportation, minimizing the risk of blockages and ensuring the smooth operation of the conveying process.
The double-walled design provides several advantages
Improved insulation: The air or insulating gap between the two pipes helps reduce heat transfer and maintain the temperature of the conveyed materials, which is especially important for temperature-sensitive substances.
Wear protection: In applications where the conveyed materials are abrasive or corrosive, the inner pipe can be lined with wear-resistant materials like ceramics or other specialized coatings, extending the pipe's service life.
Reduced blockages: The smooth and controlled flow of materials inside the inner pipe, along with the protection offered by the double-walled design, helps minimize the risk of blockages, ensuring the efficient and reliable transportation of materials.
Overall, the pneumatic conveying double-walled pipe provides an effective and reliable solution for the bulk transportation of materials in various industries, maintaining product integrity and minimizing downtime.
