Working Principle

The core of negative pressure pneumatic conveying lies in the negative pressure generated by the air source equipment (such as vacuum pumps or roots blowers), which sucks in materials through suction devices (such as suction nozzles or suction feeders). Subsequently, the materials mix with the airflow to form a gas-solid two-phase flow, which flows at high speed inside the pipeline. Finally, the materials are separated from the airflow by a separation device, collected, while the clean air is discharged or recycled after dust removal treatment.

System Composition

A complete negative pressure pneumatic conveying system mainly consists of the following components:

Air source equipment: Provides a power source for negative pressure, such as vacuum pumps, Roots blowers, etc.

Suction device: responsible for drawing materials into the pipeline, commonly including suction nozzles, suction feeders, etc.

Conveying pipeline: It connects various components to form a channel for material conveyance, and considerations need to be given to wear resistance, corrosion resistance, and sealing performance.

Separation device: It separates the material from the airflow at the conveying endpoint, ensuring efficient material collection.

Dust removal equipment: It removes dust from the emitted air to meet environmental protection requirements.

Control system: Monitor and adjust the entire conveying process to ensure stable operation of the system.

Advantageous applications

Due to its unique advantages, negative pressure pneumatic conveying has been widely applied in multiple fields:

Food industry: Maintain the freshness and hygiene of food raw materials, and achieve automated and continuous production.

Chemical industry: suitable for conveying toxic, harmful, flammable and explosive materials, reducing the risk of personnel exposure.

Pharmaceutical industry: Ensure the purity and sterility of pharmaceutical raw materials and finished products.

Environmental protection: It plays a significant role in waste disposal, dust collection, and other aspects, reducing environmental pollution.

Building materials industry: such as the transportation of powdered materials like cement and fly ash, aiming to enhance production efficiency and reduce energy consumption.