安徽省国泰泵科技有限公司

Pneumatic conveying is the use of airflow energy to transport powder and granular materials along the airflow direction in a closed pipe. It is a specific application of fluidization technology. The pneumatic conveying device has a simple structure and is easy to operate. It can be horizontal, vertical or inclined. The transportation can also carry out physical operations such as heating, cooling, drying and gas classification of materials or some chemical operations during the transportation process.

1, according to different pressures, pneumatic conveying is divided into three types: low pressure (below 50Kpa), medium pressure (50-100Kpa), high pressure (above 100Kpa).

2, according to the position of the gas source, the pneumatic conveying is divided into three kinds of conveying modes: positive pressure, negative pressure and suction pressure.

3, according to the intensity of the powder and pellets in the pipeline, the pneumatic conveying is divided into:

1. Dilute phase suspension and dispersion flow: The flow mode in the conveying pipeline with high wind speed and the material moving in a dispersed and flying state belongs to the low concentration conveying mode.

2, the bottom phase of the dilute phase suspension tube: the wind speed in the pipeline is low, close to the suspended limit wind speed. The material is concentrated in the bottom of the suspension tube at the bottom of the tube (or low-speed suspension flow).

3. Dense phase sand dune flow: The flow pattern of material sliding in the bottom of the tube like a dune, belonging to a high-concentration conveying state. It is characterized by the principle of fluidization when conveying fine powder, and is most suitable for conveying fine powder which is easy to contain air. The damage of the material and the wear of the pipeline are obviously better than the suspension flow.

4. Dense phase plug flow: The flow mode of the material group into a plug is a kind of high-concentration transport mode. The transport system with this form has small gas consumption, high transport efficiency, and is not easy to produce crushing and pipeline wear. In the case, almost no drawing occurs when the resin pellets are conveyed.

There are many materials that can be used for pneumatic conveying. Common representative materials are as follows

Rotary valve

System introduction: This system generally uses Roots blower as the gas source, rotary feeder or ejector as the feeding device. The material is fed into the conveying pipeline through the feeding device and mixed with the high-speed airflow, and then transported to the terminal receiving bin, separated by the gas. After the device is filtered, the gas is discharged into the atmosphere. The system is suitable for the project with short delivery distance (within 300 meters) and multiple receiving bins;

Advantages of the system: The conveying process is stable, and it is easy to realize a distributed distribution to multiple places, and the pipe is positive pressure, even if the pipe leaks, it will not pollute the conveyed materials.

Material seal pump

System introduction: This system generally uses Roots blower as the gas source, and the material seal pump is used as the feeding device. The material enters the conveying pipeline through the material sealing pump, and is mixed with the high-speed airflow and then transported to the terminal receiving bin, which is filtered by the gas separation device. The gas is discharged into the atmosphere, and the system is suitable for the unloading condition in which the silo is unloaded and reaches a certain level;

System advantages: simple equipment, low maintenance rate, low energy consumption, ideal equipment for energy saving without power equipment except gas source.

Single warehouse pump

System introduction: This system generally uses air compressor as the air source, warehouse pump, high-pressure rotary valve, screw pump, etc. as the feeding device. The material falls into the feeding device from the silo, and the high-pressure gas is input into the conveying pipe to let the gas It is mixed with the material to make the material fluidized, and then transported to the terminal receiving bin through the high-pressure airflow. The gas is filtered by the separation device and discharged into the atmosphere, which is suitable for long-distance and large-transport working conditions;

System advantages: low flow rate, low wear, less breakage, intermittent delivery.

Multi-bin pump

System introduction: This system generally uses air compressor as the air source, warehouse pump, high-pressure rotary valve, screw pump, etc. as the feeding device. The material storage bin falls into the feeding device, and the high-pressure gas is input into the conveying pipe to let the gas and The material is thoroughly mixed to make the material fluidized, and then transported to the terminal receiving bin through the high-pressure airflow. The gas is filtered by the separation device and discharged into the atmosphere. The system is suitable for multiple warehouse pumps to work simultaneously or separately, to one or more places. Transport conditions;

System advantages: low flow rate, low wear, low breakage, low energy consumption, continuous delivery.