Aerating case of homogenized silo

Aerating case is a pneumatic homogenized device in cement industry. It is used to convey material or pneumatic mixing powder material. It is an important aerating equipment of raw material homogenization in cement storage and mixing technology. It is widely used in manufacture and has an important effect.

Working Principle Related Technology

Aerating case is a pneumatic homogenized device in cement industry, used for feeding material or pneumatically mixing powder material in silo. Its working principle is: compressed air is introduced into the case, passes through the ventilated layer uniformly into the powder material, fluidizes the material, breaks the arching and bridging state of the material, increases the flowability of the material, thereby achieving smooth discharge, mixing or homogenization of the material. For example, in a raw meal homogenization silo, the silo bottom is covered with aerating cases, which are divided into several aeration zones according to requirements. Roots blowers supply air to the inner and outer annular zones of the silo bottom in turn and cyclically, so that raw meal flows from the outer annular zone into the inner annular zone of the central mixing chamber, and then is discharged from the central chamber into the bottom silo discharge device, achieving homogenization of raw meal.

Technical parameter of aerating case

Mixing material——Powder material, moisture is less than 1%;

Ventilated capacity——less than (3m^3/m^2 cdot min);

Ventilated resistance——800–1200Pa;

Material of ventilated layer——Terylene synthetic fibre.  

Specification expressing way of aerating case

Rectangle aerating case——Ba×L

Trapezoid aerating case——1/2（a1+a2）×L

Triangle aerating case——1/2 a×L

Note the size and position of connected pipe when aerating case is placed an order.

Sketch

Design Technology

- Structural design: The aerating case is generally composed of casing, ventilated layer, pressure-bearing perforated plate, aeration air inlet, flange frame, etc. The casing is generally made of Q235-A steel plate, and designed into different shapes such as rectangle, trapezoid and triangle according to different application requirements and silo layout.

- Ventilated layer design: The ventilated layer is a key component of the aerating case, generally made of materials such as polyester synthetic fibre. It is required to have good ventilated performance, with ventilated resistance of 800–1200Pa, ventilated capacity less than 3m³/m²·min, and at the same time possess certain strength and wear resistance to ensure long-term stable operation.

- Aeration system design: According to the size of the cement silo, material characteristics and process requirements, design a reasonable aeration system, including selection of suitable Roots blowers, determination of aeration pipeline layout and pipe diameter, installation of aeration valves, etc., to ensure that compressed air can be supplied to each aerating case uniformly and stably.

Manufacturing Process

- Material selection: The casing is made of steel plate of suitable thickness, such as 3mm thick Q235-A steel plate; the ventilated layer is made of materials meeting the requirements of ventilated performance and strength, such as PET5-6 synthetic fibre ventilated canvas; the pressure-bearing perforated plate is generally made of 2mm thick steel plate.

- Processing technology: The casing is fabricated through cutting, welding and other processes to ensure dimensional accuracy and sealing. The ventilated layer and pressure-bearing perforated plate are installed on the casing to ensure firm installation and prevent material leakage. A check device is provided at the air inlet connection to prevent material backflow when the ventilated layer is damaged.

- Assembly process: Assemble all components according to design requirements to ensure the overall structure of the aerating case is firm and all connection parts are well sealed. Install components such as aeration air inlet and flange frame to ensure accurate interface dimensions for easy connection with aeration pipelines.

Installation Process

- Installation preparation: Confirm the specific position, dimensions and surrounding environment of the aerating cases in the cement silo. Prepare construction equipment and required materials, such as air compressor, generator, welding machine, cutting machine, aerating cases, sealing materials, fasteners, etc. Determine the appropriate installation position according to the structural characteristics of the cement silo and the dimensions of the aerating cases, and use tools such as a level to ensure the elevation of the installation position is accurate.

- Component assembly: Assemble all components according to the assembly drawings of the aerating case to ensure each component is firmly connected with no air leakage. For parts requiring connection, use dedicated connectors and check whether the connection is tight and reliable.

- Overall installation: Install the assembled aerating cases to the predetermined positions and secure the casings. Connect the aeration pipelines to ensure firm connection with no air leakage. After installation of the aerating cases is completed, conduct an aeration test to check whether the aerating cases can be properly aerated and maintain stable pressure.

Maintenance Process

- Routine maintenance: Regularly inspect the appearance of the aerating cases for damage, deformation or material leakage. Check whether the aeration pipelines and valves are functioning properly, and whether there are issues such as air leakage or blockage. Clean the dust and debris on the surface of the aerating cases to keep them clean.

- Periodic maintenance: Regularly inspect and clean the ventilated layer; if blocked or damaged, clean or replace it in a timely manner. Check the operating condition of aeration equipment such as Roots blowers and perform necessary maintenance and servicing.

- Fault repair: When the aerating cases malfunction, such as uneven aeration, poor material fluidization, or damaged ventilated layer, diagnose and repair in a timely manner. Maintenance personnel are required to possess relevant professional knowledge and skills, be able to accurately determine the cause of the fault, and take corresponding repair measures, such as replacing damaged components or repairing air leakage parts.