Dense phase conveying, also known as positive pressure conveying, is a method for transporting dry bulk materials through enclosed pipelines using compressed air. In this method, material forms a dense plug that is pushed through the pipe by the pressurized air. This technique is particularly suitable for conveying materials that are fragile, abrasive, or prone to air entrapment
The positive pressure dense phase pneumatic conveying device is a sophisticated material transfer system employing a sending tank to propel materials. This innovative system utilizes air source pressure exceeding 1kg/cm2 to push materials efficiently through a conveying pipeline. Noteworthy features include a substantial transportation volume, enabling the conveyance of large quantities of material, along with an impressive transportation distance. The system is characterized by a high gas-to-solid ratio, indicating an efficient use of air pressure to transport materials.
One of the distinctive attributes of this pneumatic conveying device is its ability to operate with a low gas flow rate, contributing to energy efficiency. The system’s design minimizes wear on the conveying pipeline, enhancing its longevity and reliability. Referred to as air flow conveying, the conveyor pump equipment harnesses the energy of air flow to facilitate horizontal, vertical, or oblique material transfer. This versatile approach adds to the system’s adaptability across various orientations, making it a robust solution for industries requiring efficient and reliable material conveying.
A dense phase pneumatic conveying system operates with a sending tank, propelling materials through a conveying pipeline using air pressure exceeding 1kg/cm². It excels in efficiently transporting large volumes of materials over extended distances, offering a controlled and gentle approach to material handling.
Key Functions:
System Components:
The system comprises conveying and sending tanks, conveying pipelines, blowing aid components, receiving bins, and other essential elements that collectively facilitate efficient material transfer.
Controlled Slugs:
Dense phase systems utilize controlled slugs of air to push the product through the pipeline, followed by another pulse of both air and product. This ensures precise and gentle material movement, especially beneficial for fragile products.
Precise Calculations:
Unlike lean phase systems, dense phase systems demand more precise calculations for design and timing to ensure optimal material transport without causing damage.
Applications:
Dense phase conveying systems find suitability in moving abrasive materials like sugar, heavy bulk density products, blended materials, friable substances such as carbon black prills, and plastic pellets that do not require continuous delivery. Their versatility makes them valuable across various industries.
Dense phase conveying in positive pressure systems involves moving materials at pressures greater than 30 psig (~2 barg) with a solids loading of more than 15 lb of solids per pound of gas. The key specifications for dense phase conveying include
Dense phase conveying is characterized by low velocity, high pressure, and high product to air ratio. It offers advantages such as reduced component wear compared to dilute phase systems, lower operating costs, basic maintenance, and reduced material segregation & degradation 
The UV series up draft powder conveying pump is suitable for conveying powder materials with high production capacity, high specific gravity, large particle size, and low hardness. The designed equivalent conveying distance is generally ≤ 1000 m, with a vertical climb of 60 m and a powder specific gravity of ≤ 6.0 t/m ³, Powder particle size ≤ 5.0mm, moisture content ≤ 3%, maximum instantaneous temperature of powder ≤ 200 ℃, suitable for single or multi-point discharge conditions.
UV series upward suction powder conveying pump, powered by compressed air, is one of the earlier pneumatic conveying equipment used in power plant pneumatic ash removal systems. The bottom of the pump is equipped with a fluidization plate, which pressurizes the powder inside the pump to fluidize. After reaching the set pressure value, the discharge valve is automatically opened, and the powder enters the conveying pipeline at high speed under the action of fluidization and pressure difference, thereby achieving the purpose of powder transportation.
This pump has a boiling structure, and when the discharge valve is opened, the initial flow rate is high. It is not suitable for conveying powder materials with strong grinding properties and high hardness. But when the material characteristics and conveying distance allow, the discharge valve can also be opened first, and then the gas source control valve can be opened, so that the material enters the conveying pipeline at a lower flow rate while fluidizing, which can effectively reduce the wear of the discharge valve and discharge pipe. Due to the low initial flow rate of the material, it is not suitable to transport over long distances.
The UV series medium suction powder conveying pump is suitable for conveying powder materials with high output, specific gravity, particle size, strong grindability, and high hardness. For conveying powder materials with strong grindability and high hardness, composite ceramic wear-resistant pipes are required. Design equivalent conveying distance
Shanghai Youwei’s Horizontal Ribbon Mixer stands as a versatile solution catering to industries spanning chemicals, pharmaceuticals, food processing, and construction. Ideal for blending powder with powder, powder with liquid, or powder with granules, this mixer ensures impeccable mixing efficiency and minimal downtime.
Automatic batching systems offer a reliable solution for handling and combining bulk powders with exceptional precision. They are ideal for applications requiring consistent and repeatable batches, eliminating the potential for
Ensuring accurate and efficient powder transfer is crucial in various industries. Shanghai Youwei offers a comprehensive range of dosing and weighing solutions specifically designed for powder conveying systems. These systems
UV-KQW Quick Clean Hygienic Rotary Valves are engineered to enhance productivity by minimizing downtime required for frequent cleaning of valve internals. Qualified by USDA Dairy and EHEDG, these valves are
UVZC Heavy Duty Blowing Seals Rotary valves are designed to efficiently feed powdery or granular materials into pneumatic conveying systems. These robust valves feature a tubular cast iron or stainless steel casing, a horizontally mounted rotor with V-shaped compartments, and various drive units. They are ideal for applications in industries like wastewater treatment, sugar mills, food processing, cement packaging, and more.
From hygienic to extra heavy-duty applications, rotary valves stand as indispensable components in numerous powder handling processes. At UV, our products seamlessly integrate the specialized knowledge of a dedicated valve
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