dilute phase pneumatic conveying

What is dilute phase pneumatic conveying?

• The basic principle of dilute phase pneumatic conveying is to use air flow to suspend solid particles and transport them to the target location through pipelines. During the transportation process, the air flow generates drag force on the solid particles, causing them to move with the air flow. The conveying speed of dilute phase pneumatic conveying is usually high, which can reach several meters to tens of meters per second, so the conveying distance is relatively long.
• The advantages of dilute phase pneumatic conveying include its fast conveying speed, long conveying distance, small footprint, and automatic control.
• In dilute phase pneumatic conveying, air flow parameters and solid particle characteristics are important factors affecting the conveying effect. Parameters such as air flow speed, air flow pressure, and air flow temperature will affect the suspension state and conveying speed of solid particles. At the same time, the particle size, density, shape and other characteristics of solid particles will also affect the transportation effect. Therefore, when selecting dilute-phase pneumatic conveying technology, the air flow parameters and conveying equipment need to be determined based on specific material characteristics and conveying requirements.
• In practical applications, dilute-phase pneumatic conveying systems usually consist of conveying pipelines, gas source equipment, feeding equipment, control equipment, etc. The conveying pipeline is responsible for transporting solid particles from the feeding equipment to the target location. The air source equipment provides the required air flow. The feeding equipment is responsible for sending the solid particles into the conveying pipeline. The control equipment is responsible for monitoring and controlling the entire conveying process.
• In the metallurgical industry, dilute phase pneumatic conveying also plays an important role. For example, in the blast furnace ironmaking process, the charge needs to be transported and distributed. Dilute phase pneumatic conveying can achieve rapid and uniform charge distribution, thereby improving the smelting efficiency and output of the blast furnace.

What is the difference between lean phase and dense phase?

‌The main difference between dilute phase and dense phase lies in the density and conveying characteristics of materials during transportation. ‌ Dilute phase usually refers to materials dispersed in a large amount of gas during transportation, while dense phase means materials are transported relatively densely.

What are the different types of pneumatic conveying?

• ‌Pneumatic conveying mainly includes the following types: dilute phase conveying, dense phase conveying, suction pneumatic conveying, pressure conveying pneumatic conveying, mixed pneumatic conveying and flow pneumatic conveying. ‌
• Dilute phase transportation and dense phase transportation are distinguished according to the state of the material in the pipeline. During dilute phase transportation, the solid content is lower than 1-10kg/m³, and the operating gas speed is high, usually 18-30m/s, which is suitable for short-distance transportation. During dense phase transportation, the solid content is 10-30kg/m³ or the solid-gas ratio is greater than 25, and the operating gas speed is low, which is suitable for long-distance transportation.
• Suction pneumatic conveying and pressure-feeding pneumatic conveying are distinguished based on the relationship between air flow pressure and atmospheric pressure. During suction pneumatic conveying, the pressure in the pipeline is lower than atmospheric pressure, and the negative pressure is generated by the fan to suck in the material, which is suitable for multi-point picking and short-distance transportation. In pressure-feeding pneumatic conveying, the pressure in the pipeline is higher than atmospheric pressure, and materials are pushed through positive pressure, which is suitable for long-distance and large-volume conveying.
• Hybrid pneumatic conveying is a combination of suction conveying and pressure conveying. It can transport materials over long distances at multiple points, but the equipment is complex and the cost is high. Streaming pneumatic conveying is a special suspension conveying method, suitable for conveying large amounts of powdery materials.
• Each type of pneumatic conveying has its specific application scenarios, advantages and disadvantages. For example, dilute phase conveying has simple operation but limited distance; dense phase conveying has long distance but complex equipment; suction type is suitable for multi-point picking but short distance; pressure feeding type is suitable for long-distance transportation but complex equipment. Choosing the right pneumatic conveying method can improve efficiency and reduce costs.