Structure Composition and Operating Principle of Pressure Drum Filter

Pressure Drum Filter has been widely used in various industrial fields due to its excellent separation efficiency and flexible process adaptability. This article will provide a detailed introduction to the structure and operating principle of the Pressure Drum Filter, helping readers to better understand this important equipment.

Structure of the Pressure Drum Filter

Pressure Drum Filter is designed with an emphasis on efficiency and stability and is mainly composed of the following key components:

Housing

The interior of the housing is divided into multiple sections by partitions to ensure that each section can realize different functions according to process requirements. These functions usually include slurry feeding, washing medium input, and dry air introduction. Through this design, the Pressure Drum Filter can flexibly adapt to different processing needs.

Drum and Filter Elements

The surface of the drum is divided into multiple independent filtering units, each filled with filter elements to provide space for the formation of filter cake. Filter elements are usually made of filter cloth or metal mesh, possessing strong filtering capabilities. The filtrate is collected through a filtrate port below the filter element and directed to the control head for efficient discharge.

Partitions

The partitions, made of wear-resistant plastic materials, divide the drum into different sections through external air pressure. The material of the partitions (such as PEEK or PVDF) can be selected based on the properties of the materials, such as temperature, acidity, and solvents, enhancing the suitability and durability of the equipment.

Control Head

The control head is responsible for discharging the filtrate, wash liquid, and dehumidified gas-liquid mixture. It corresponds exactly to the sections of the housing, enabling the collection of different material flows at the outlet. Additionally, the control head is equipped with a back-blow device, efficiently aiding the discharge of filter cake.

Filter Cake Discharge Port

This discharge port operates differently from other sections, typically discharging under atmospheric pressure. With the help of back-blowing air or discharge scrapers, filter cake can be smoothly discharged. Moreover, this area includes a filter cloth washing and regeneration device to ensure the permeability of the filter cloth, enhancing filtration efficiency.

Drive System

The drive system mainly consists of a variable frequency motor, reducer, and coupling to drive the rotation of the drum. With the inclusion of a frequency converter, the rotational speed of the drum can be adjusted, enabling flexible control of operating conditions.

Operating Principle of the Pressure Drum Filter

The operating principle of the Pressure Drum Filter is based on the process of "slurry filtration - filter cake washing - filter cake dewatering - filter cake discharge." In practical operations, the position of the partitions can be adjusted as needed to achieve different process sections. As the drum rotates, the filtration process is divided into the following stages:

Feeding and Filtration

In this stage, slurry is introduced into the filter, and solid particles are retained by the filter elements, forming a filter cake.

Filter Cake Washing

After the filter cake is formed, it is washed with a washing medium to remove impurities remaining in the filter cake. This process can be optimized for multiple washes by adjusting the partitions, ensuring the purity of the filter cake.

Filter Cake Drying

After washing, the filter cake needs to be dewatered to reduce moisture content. At this stage, drying air is introduced to accelerate the drying process of the filter cake.

Filter Cake Discharge

Finally, the dried filter cake is discharged through the discharge port. Back-blowing air and scraper discharge technology ensure the filter cake is smoothly discharged, readying the equipment for the next processing cycle.

The Pressure Drum Filter, with its fully continuous operation, allows for linear and stable transitions between various processes. This flexibility enables it to adapt to various process requirements, such as multiple washes in the cellulose industry and the use of different solvents in the pharmaceutical industry.