The core principle of gypsum powder pneumatic conveying is to use the kinetic energy of the airflow or the pressure difference inside and outside the pipeline to form a stable gas-solid two-phase flow in a closed pipeline. The gypsum powder particles are uniformly carried or pushed into a plug to the designated end point, and then separated from the air by a gas-solid separation device. The entire process relies on the closed pipeline to complete the transportation, solving the pain points of gypsum powder being prone to dust and moisture agglomeration.

Compared with materials such as fly ash, although the conveying principle of gypsum powder is the same as gas-solid two-phase flow transmission, its working principle focuses on "moisture prevention, anti agglomeration, and stable flow rate" due to its strong moisture absorption, easy agglomeration, uniform particle size, and low abrasion properties. The overall process still follows the general closed loop of pneumatic conveying, which is divided into four key links and corresponds to two mainstream process forms that are suitable for gypsum powder:

Gas supply pressure: A positive or negative pressure environment is established in the pipeline by the gas source equipment, forming a continuous and stable airflow. Due to the fact that gypsum powder does not require high kinetic energy to be transported, the airflow only needs to meet the requirements of "carrying animal material flow and preventing material deposition", avoiding excessive suspension of materials caused by high-speed airflow.

Anti blocking feeding: Gypsum powder enters the pipeline from the silo through a dedicated feeding device. The feeding process will synchronously complete the "material arch breaking+uniform feeding" to prevent the gypsum powder in the silo from being unable to fall smoothly due to moisture and compaction. At the same time, it ensures the initial mixing of the material and the airflow, avoiding pipeline blockage caused by sudden large feeding.

Pipeline transportation: After gypsum powder enters the pipeline, it fully merges with the airflow to form a gas-solid two-phase flow, which presents two flow states depending on the process - suspended flow or plug flow. The entire pipeline is sealed to isolate external water vapor and prevent gypsum powder from getting damp and clumping.

Gas solid separation unloading: After the gas solid mixture reaches the endpoint, it enters the separation device, and the gypsum powder particles are intercepted by gravity or filtration and fall into the endpoint material bin; The separated air is purified and discharged to meet the standard, without any leakage of gypsum powder dust.

Core principle: Powered by compressed air, a positive pressure airflow is formed inside the pipeline, pushing the gypsum powder towards the endpoint, and the material moves in a suspended state with the airflow. Adaptation logic: Taking advantage of the low workability and easy suspension of gypsum grinding, low kinetic energy airflow can be used to achieve short distance and small to medium flow conveying. The process is simple and the start stop is flexible, suitable for short distance transportation from the raw material warehouse to the production workshop in gypsum board factories and dry powder mortar factories.

2. Positive pressure dense phase transportation

Core principle: High pressure and low flow velocity airflow is used to integrate gypsum powder into material plugs within the pipeline. The material plugs are separated by air columns, and the pressure of the air columns is used to push the material plugs forward at low speed. Adaptation logic: Low flow rate conveying can avoid static electricity or fine particle flying caused by high-speed friction of gypsum powder. At the same time, a sealed high-pressure environment can effectively isolate external water vapor and prevent gypsum powder from getting damp and clumping. It is suitable for "gypsum calcination kiln to finished product warehouse" or long-distance transportation across workshops, especially for high-end gypsum building materials production with high requirements for material purity and dryness.

Industry scenario:Large scale paper faced gypsum board production workshop. The calcined gypsum powder needs to be transported from the finished product homogenization warehouse to the batching and mixing plant for multiple board core forming lines. Material characteristics: Gypsum powder is highly susceptible to moisture, hydration, and dust. It requires a sealed and fast response during transportation. Process configuration: Positive pressure dilute phase pneumatic conveying system, adopting single point feeding and multi-point unloading mode.

Pick up end: Install a rotating feeder at the bottom of the gypsum powder warehouse to evenly feed the material into the main conveyor.

Transportation process: The gas source provides power to make the gypsum powder move at high speed in a suspended flow state inside the pipeline. After entering the workshop, the pipeline is divided into multiple branch pipes, which are switched by pneumatic material distribution valves to distribute materials to different molding production lines.

Unloading end: The material directly enters the small bin above the mixing plant, and the exhaust gas is purified by a bag filter before being discharged.

Fast response: The dilute phase system has flexible start stop and can accurately match the frequent start stop rhythm of the gypsum board production line.

Layout optimization: The pipeline is arranged overhead, which does not occupy the workshop floor space and solves the complex layout problem of multiple production lines feeding at the same time.

Zero pollution: The entire process is sealed, completely eliminating the dust generated by gypsum powder in the workshop and preventing it from becoming damp and ineffective.

Loading and fluidization: Gypsum powder enters the silo pump by gravity, and after the top of the silo pump is sealed, compressed air is introduced to fluidized the material.

Low speed conveying: using high-pressure gas to push gypsum powder into discontinuous material plugs in the pipeline, moving forward in the form of a low-speed group flow.

Terminal reception: After reaching the destination, gas-solid separation is carried out through the expansion bin, and gypsum powder falls into the finished product bin.

Quality assurance: Low flow conveying avoids severe collisions and breakage between gypsum powder particles, ensuring that the fineness modulus of the raw materials remains unchanged.

Low maintenance: Due to the low flow rate, there is almost no wear on the pipes and elbows, greatly reducing equipment maintenance costs.

Anti caking: The high airtightness of dense phase transportation effectively isolates external humid air, solving the industry pain point of gypsum powder clumping easily during long-distance transportation.

1. Negative pressure suction: When the bulk tanker truck arrives at the factory area, the negative pressure system is used to directly "suck" the gypsum powder in the tanker truck into the raw material warehouse in the factory area without manual intervention, and the unloading process is dust-free.

2. Positive pressure feeding: During the batching stage, gypsum powder is transported from the raw material bin to the measuring scale above the mixer through a positive pressure dilute phase system.

Functional zoning: It realizes the process separation of "raw material receiving" and "production batching".

Strong compatibility: Negative pressure solves the problem of dust-free discharge of foreign materials, while positive pressure solves the problem of precise batching in the workshop. The advantages of the two systems complement each other and are suitable for the production characteristics of dry mortar with multiple formulas and raw materials.