Dense phase and dilute phase pneumatic conveying are two main pneumatic conveying methods, which have significant differences in material conveying density, speed, and application scenarios. The following is a detailed explanation of these two conveying methods:

Dense phase pneumatic conveying

Definition:

Dense phase pneumatic conveying refers to the process in which the material in the pipeline exhibits a high concentration state, that is, the volume fraction of the material is high. In the gas-solid two-phase flow formed by the mixture of gas flow and material, the concentration of solid material is relatively high.

Features:

High solid to gas ratio: The concentration of materials in the pipeline is high, and the solid to gas ratio (the ratio of material volume to gas volume) is relatively large.

High efficiency: Due to the high concentration of materials, a large amount of material is transported per unit time, resulting in high conveying efficiency.

Stable and reliable: The dense phase conveying system usually operates stably, and materials are not easily deposited or blocked in the pipeline.

Long distance conveying: suitable for scenarios with long distances and large conveying volumes, especially performing well when conveying materials with strong abrasion resistance.

High pressure conveying: It belongs to the high-pressure conveying mode and requires high gas pressure to drive the material to move inside the pipeline.

Application Scenario:

Dense phase pneumatic conveying is suitable for long-distance, high-volume, and highly abrasive scenarios, such as conveying materials such as coal, ore, cement, etc.

Dilute phase pneumatic conveying

Definition:

Dilute phase pneumatic conveying refers to the low concentration state of materials in pipelines, that is, the volume fraction of materials is low, and the concentration of solid materials is relatively small in the gas-solid two-phase flow formed by the mixing of gas flow and materials.

Features:

Low solid to gas ratio: The concentration of the material in the pipeline is low, and the solid to gas ratio is relatively small.

Low pressure and high speed: usually using lower gas pressure but faster airflow speed to transport materials in a suspended state.

Small equipment investment: The structure of the dilute phase conveying system is simple, and the equipment investment is relatively small.

Short distance conveying: suitable for scenarios with short distances and small conveying volumes.

Material is prone to breakage: Due to the suspended state of the material in the pipeline, it is easily crushed by the impact of airflow during transportation.

Application Scenario:

Dilute phase pneumatic conveying is suitable for various bulk materials, such as grain and chemical raw materials, and performs well in short distance and small conveying volume scenarios.

summary

There are significant differences in material concentration, conveying efficiency, and application scenarios between dense and dilute phase pneumatic conveying. Dense phase pneumatic conveying is suitable for scenarios with long distances, large conveying volumes, and strong material abrasion, while dilute phase pneumatic conveying is suitable for scenarios with short distances and small conveying volumes. In practical applications, it is necessary to comprehensively consider factors such as material properties, conveying distance, and conveying volume to select the appropriate conveying method.