Classification of industrial centrifuges

According to China's national standards, industrial centrifuges are generally divided into:

Filter centrifuge

Decanter centrifuge

Separator

On the drum wall of the centrifuge with filter holes, filter media (such as mesh and filter cloth) are laid on top. The suspension added to the drum rotates with the drum, and the liquid in it is thrown out through the filter residue layer (solid layer), filter media (mesh and filter cloth), and the holes in the drum wall under the action of centrifugal inertia force. The solid particles are trapped on the surface of the filter media to form a filter residue layer, thus achieving the separation of solid and liquid.

The centrifuge drum has no holes, and the suspension added to the drum rotates together with the drum. The centrifugal inertia force generated by the density of the solid-liquid phase is also different. The solid phase settles on the drum wall to form sediment due to the large centrifugal inertia force, while the liquid phase settles on the inner layer due to the small centrifugal inertia force. Then, the solid and liquid phases are discharged separately from the machine through different discharge methods to achieve separation.

Specifically refers to separating two immiscible emulsions or emulsions containing trace amounts of solids. Due to the small density difference between the liquid and liquid phases, it is necessary to strengthen the centrifugal force field (high-speed rotation) to separate the liquid and liquid phases. The heavy phase is in the outer layer and the light phase is in the inner layer, and then the heavy and light phases are separately extracted from the outside of the machine through a certain device to achieve separation. This type of high-speed centrifuge is called a separator.

Suitable for separating suspensions with high solid content and large solid particles (generally greater than 10um).

Suitable for the separation of suspensions with low solid content (low concentration) and small solid particles.

Suitable for the separation of suspensions with extremely low solid content (less than 1%), small solid particles, and minimal density difference between solid and liquid, or emulsions with minimal density difference between light and heavy phases.

Product scope of application

Factors affecting centrifuge selection

The solid concentration in the material, the size, shape, and properties of the solid material, the water absorption, friction coefficient, temperature, pH value (acid-base composition) of the solid, as well as the density difference and viscosity between the solid and liquid, play a decisive role in the selection of centrifuges.

For materials with special characteristics, such as flammability, explosiveness, strong corrosion and wear resistance, it determines the structure and material selection of the machine.

Although the separation of materials is not complicated, the choice of centrifuge type varies depending on the process requirements. The allowable moisture content of dehydrated solids, whether solids can be crushed, and the allowable solid content in liquids have a certain impact on the selection of centrifuges. In general:

High solid concentration, solid particles are crystals and have a relatively large particle size (>10 μ m) - a filtration centrifuge can be selected.

Material crystals are not allowed to break - manual discharge, bag pulling discharge, bag flipping and other types of centrifuges can be used.

The material crystals are slightly broken - centrifugal machines such as scraper unloading and piston pushing (low-speed scraping) can be used.

Material crystals are allowed to be crushed - centrifugal machines such as scraper discharge and spiral discharge (high-speed scraping) can be used.

When the solid concentration is low, the solid particles are very fine, and the material viscosity is high, a settling centrifuge can be used.

Advanced experimental equipment

Jiangsu Huada has established a comprehensive testing system to ensure product quality, equipped with various advanced inspection and testing instruments and equipment, such as metallographic analyzer, carbon sulfur analyzer, hardness analyzer, etc. used for testing welding quality, X-ray inspection room, tensile laboratory, ultrasonic detector, magnetic particle flaw detector, etc. used for testing weld and processing quality.

Testing and experimentation

High precision dynamic balance tester for detecting the balance quality of rotary drums, as well as high-precision coordinate measuring instrument for detecting the quality of metal processing. It is precisely with such a rigorous quality inspection system and advanced testing equipment that we can ensure the delivery of high-quality products with excellent performance and stability to every customer.

The materials separated by centrifuges have a certain degree of corrosiveness, and the materials in contact with the materials must meet the requirements of corrosion resistance to ensure the safe use of the equipment.

We will provide products made of various materials based on the corrosion data of the separated materials or through physical and chemical experiments, such as carbon steel, stainless steel (304 321 316L 2205 2507 904L, etc.), titanium and titanium alloys (TA1TA2 TA8 TA10), Hastelloy (C series, B series), Monel alloy, zirconium material, tantalum material, carbon fiber, etc.

In the case where the equipment base material cannot meet the corrosion resistance requirements, surface anti-corrosion treatment can also be adopted, such as lining with plastic (lining with PE, lining with PO), lining with rubber, spraying with fluorine materials (F30, F40, F46, PFA), etc.

The selection of filter cloth should first meet the anti-corrosion requirements, and the corresponding filter cloth material should be selected according to the chemical properties of the separated material. For example: nylon, polypropylene, polyester F30、F40、 Materials such as polytetrafluoroethylene, polypropylene, polyester, etc. The mesh size (model) of the filter cloth is determined based on the particle diameter and particle size distribution of the separated material. Generally, when selecting the mesh size (model) of the filter cloth, it should be slightly larger than the diameter of the particles to be intercepted. In the initial stage of filtration, a small number of small particles pass through the filter, and when larger particles are intercepted, they form a filter cake layer

For specific materials, such as large particles, filter media such as sintered mesh sheets can be used.

CIP online cleaning technology

With the continuous improvement of hygiene requirements in the centrifuge market, manual cleaning often brings new pollution while overcoming material cross contamination. We are constantly exploring and improving equipment cleaning design, configuring CIP online cleaning system, which can achieve comprehensive internal cleaning and meet GMP standards and hygiene requirements when the centrifuge is closed or in operation.

Centrifugal slant plate fabric technology

During the operation of centrifuges, uneven fabric distribution often causes significant machine vibration, poor separation efficiency, and low processing capacity, seriously affecting product quality and equipment service life. In order to better solve the problem of fabric distribution, our company has developed a slanted disc fabric device based on lateral and intermediate fabrics. This type of device adopts a unique streamlined design according to fluid mechanics principles, which can improve fabric balance and uniformity and reduce fabric vibration for materials with high viscosity and poor fluidity. The projection of the discharge port on the circumference of the fabric disc follows a sine curve distribution. By controlling the material spraying sector, a uniformly thick filter cake layer is formed on the inner wall of the drum.

Centrifugal explosion-proof technology

The safe application of centrifuges in flammable, explosive, and highly corrosive environments is a concern for both us and our customers. We have never slackened in the design of explosion-proof structures, optimization of explosion-proof configurations, or upgrading of explosion-proof control systems for centrifuges. We have rich experience in explosion-proof sites and a professional team of safety and explosion-proof planners. Based on the characteristics of different materials and explosion-proof locations, we provide you with optimal solutions.

Multiple control modes

Huada centrifuge cutting-edge technology

On the basis of visual technology, non-contact level detection is achieved by dynamically capturing the fabric situation and using AI intelligent algorithms.

Intelligent material level detection

Remote monitoring platform

Application of new materials

Remote operation and maintenance of centrifuge

Intelligent automatic control

Through IoT technology, the control system data is uploaded to cloud servers to achieve data collection, fault warning, data storage, remote program transmission, and monitoring.

The application of new materials and processes in centrifuge production: using new engineering materials or composite carbon fiber materials to produce the main key components of centrifuges, greatly optimizing the key operating indicators of centrifuges.

Through pre-processing and extensive training of images collected by machine vision, automated analysis of material properties and mother liquor properties is completed, ultimately achieving intelligent control of the entire process of feed dewatering, washing, and dehydration.

Remote equipment operation and maintenance: equipment file maintenance, information management, maintenance application, preventive maintenance, etc.

Remote data analysis: energy consumption prediction and planning, equipment efficiency analysis, etc.