This system is a low-pressure pneumatic conveying device adopting a Roots blower or high-pressure centrifugal fan as the air supply mechanism. The feeding device is often a specific type of rotary feeder selected based on the application. Once the fan is started, positive pressure air is delivered into the conveying pipeline. Materials from the feeder or hopper are forcibly fed into the pipeline through the rotary valve feeder, where they mix with the airflow. The airflow then carries the materials along the conveying pipe to the destination silo. The air, after passing through the material-air separation device, is filtered and discharged into the atmosphere.
The system enables continuous conveying, characterized by low velocity and stability. The main components include a Roots blower or high-pressure centrifugal fan, rotary feeder valve, acceleration chamber, dust collector, or cyclone separator.
System Advantages
- Stable conveying process.
- Capable of dispersing materials to multiple locations from a single source.
- Suitable for transporting powders and small-granule materials.
System Features
1. This conveying method supports both continuous and intermittent conveying.
2. Working Pressure:<0.1MPa.
3. Material-to-Air Ratio:μ = 2~10.
4. Operating Temperature Range: -20°C to 150°C.
5. Conveying Distance: ≤500M.
6. Conveying Height: ≤45M.
7. Conveying Capacity: <40T/H.
8. Power Source: Typically a Roots blower.
2.Dense Phase Pneumatic Conveying System with Sending Tank
This type of system is a batch feeding system. The key feature of this conveying system is the presence of high gas flow and relatively high pressure in the pipeline at both the start and end of the conveying process. The distinctive "whoosh" sound often signifies the end of the conveying process. This system is composed of components like a compressor, pressure vessel (sending tank), and conveying pipeline.
Working Principle
During the feeding stage, material enters the sending tank through a dedicated feeding valve. The gas in the sending tank is released through a balancing valve, which facilitates material feed-in by eliminating back pressure that hinders material flow. Once the tank is filled, the level sensor, pressure switch, or weighing sensor sends a signal, triggering the closure and sealing of the feed valve and exhaust valve.
Compressed gas is then introduced into the sending tank. When a certain pressure is reached, the discharge valve opens automatically. Inside the sending tank, the compressed gas mixes with the material and applies pressure to the conveying pipeline. Materials are conveyed in discrete plugs or slugs until both the sending tank and the pipeline are emptied.
As the system approaches the end of the conveying cycle, the pressure in the sending tank drops to zero. At this point, the intake valve is closed, and the residual gas is vented. The discharge valve and balancing valve are closed, and the feeding valve is activated to start the next conveying cycle.
System Features
1. Batch Conveying System
This is a cost-effective type of pneumatic conveying system that operates in batches.
2. Material Compatibility
It is typically suitable for applications that require longer conveying distances and can handle granular materials with good flowability, both abrasive and non-abrasive.
3. System Components
The system consists of:
- Pressure vessel (sending tank)
- Valve group (feeding valve, discharge valve, intake valve, relief valve, balancing valve)
- Pressure transmitter
- Level sensor
- Electrical control system
- Conveying pipeline
- Terminal separation silo
- Rotary valve
- Dust removal system
4. High Gas Flow and Pressure
At both the initial and final stages of the conveying process, the system exhibits high gas flow and high conveying pressure. The "whoosh" sound often indicates the end of the process cycle.
5. Power Source
This system is generally powered by compressed air or compressed nitrogen gas.
3.Negative Pressure Pneumatic Conveying System
The negative pressure pneumatic conveying system is an advanced material handling device, characterized by its compact structure and reliable operation. It can transport loose, dry powder or granular materials horizontally, inclined, or vertically. This system is suitable for processes such as bulk feeding, bulk conveying, and bulk unloading in various production workflows.
Negative pressure conveying operates under vacuum conditions, generating a negative air pressure flow. Driven by this airflow, bulk materials are transported through suction
hoses or pipelines to another container. Since the materials are always conveyed under vacuum conditions, even if a pipeline leak occurs, materials will not escape into the surrounding environment.
The negative pressure system is particularly suitable for applications involving multi-point feeding and single-point discharge, and it is commonly used to transport lightweight materials.
System Features
1. This conveying method supports both continuous and intermittent conveying.
2. Working Pressure: <0.1MPa.
3. Material-to-Air Ratio: μ = 2~10.
4. Operating Temperature Range: -20°C to 150°C.
5. Conveying Distance: ≤200M.
6. Conveying Height: ≤35M.
7. Conveying Capacity: <40T/H.
8. Power Source: Typically a Roots blower.
