Working principle and structural composition of horizontal screw centrifuge
1. Principle introduction
Horizontal screw centrifuge is a device that realizes continuous solid-liquid separation based on the principle of centrifugal sedimentation. The material is subjected to huge centrifugal force in the high-speed rotating drum. The solid particles settle rapidly because their density is greater than that of the liquid, forming a solid phase layer; at the same time, the clear liquid is thrown to the center area of the drum and discharged through the overflow port to achieve solid-liquid separation.
The outstanding features of this equipment are continuous feeding, continuous slag discharge, and continuous liquid discharge. It can adapt to various complex working conditions with high concentration, high viscosity, and fine particles, and is widely used in industrial continuous production lines.
2. Structural composition
A complete horizontal screw centrifuge is mainly composed of the following core structures:
Drum: One of the core components, in which the material completes the high-speed rotation and separation process, and is often made of corrosion-resistant and wear-resistant materials such as stainless steel and duplex steel;
Screw conveyor: Embedded in the drum, it rotates in the opposite direction to the drum at a certain differential speed, and transports the settled solids axially to the slag discharge port;
Differential gearbox: Adjusting the speed difference between the screw and the drum is the key to affecting the separation dryness and slag discharge capacity;
Drive system (Motor & VFD): Control the speed of the main motor and auxiliary motor through the frequency converter to achieve energy consumption optimization and precise control;
Casing and frame (Frame): Used for support, protection and shock absorption;
Feeding and discharge system (Feeding & Discharge): Designed as pressure type, free flow type and other structures according to customer process requirements.
Technical advantages of decanter centrifuge
1. Continuous operation and high-efficiency separation
Decanter centrifuge can continuously feed and discharge slag, which meets the needs of large-scale and high-frequency industrial production. Compared with intermittent filtering equipment, it has significant advantages of large processing capacity, simple operation and high degree of automation.
2. Automatic control and intelligent adjustment
Modern decanter centrifuges are generally equipped with PLC control systems and touch screen operation interfaces. Users can monitor the operating status in real time, collect data, alarm linkage control and remotely adjust the differential speed to meet the management needs of smart factories.
3. Diverse materials and reliable structures
For different working conditions, materials such as 304, 316L, 2205 duplex stainless steel, Hastelloy alloy, tungsten carbide coating can be selected, which are suitable for strong acid and alkali, highly abrasive and corrosive material environments.
4. Simple maintenance and long service life
The equipment structure is modularly designed, easy to disassemble and assemble, and easy to maintain and clean. The life of key components is 3 to 5 years, and the service life of the whole machine is more than 10 years.
5. Energy saving and consumption reduction, environmental protection and economy
Frequency conversion drive, high-speed and stable operation, high-dryness slag discharge, greatly reducing subsequent drying energy consumption; the discharged clear liquid can directly enter the next process or be discharged, helping enterprises achieve green environmental protection.
Main application areas of decanter centrifuge
With its wide adaptability and high reliability, decanter centrifuge covers almost all industrial processes involving solid-liquid separation. The following are typical application scenarios:
1. Municipal and industrial sewage treatment
Sludge dehydration in urban sewage treatment plants
Industrial wastewater treatment (electroplating, papermaking, textiles, printing and dyeing, chemicals, etc.)
River and lake sludge treatment
Leachate pretreatment system
Features: high solid content sludge, continuous dehydration, energy saving and consumption reduction, easy to incinerate or landfill later.
2. Chemical industry
Recycling of fine chemical products (dyes, pigments, resins, etc.)
Separation of catalysts, quartz sand, and inorganic salts
Separation of synthetic materials, silica gel, and ceramic powders
Separation of highly corrosive liquids
Features: corrosion-resistant design, explosion-proof structure, high separation accuracy, and stable operation.
3. Food and beverage industry
Pomace separation in fruit juice and vegetable juice production
Starch, protein, plant fiber extraction
Wine lees and yeast recovery in wine production
Residue separation of animal fats and vegetable oils
Features: food-grade contact material, low residue, washable design.
4. Petroleum and energy industry
Drilling mud recovery and solid control system matching
Oil sludge dehydration and oily wastewater treatment
Sludge dehydration after anaerobic digestion in biogas projects
Lithium battery slurry, positive and negative electrode material separation
Features: Applicable to viscous oily materials, oily materials, and uneven particle suspensions.
Decanter centrifuge is not only an industrial separation equipment, but also a modern industrial solution with “high efficiency, low energy consumption, strong adaptability and sustainability”. With the continuous advancement of green development and intelligent manufacturing around the world, the market prospects of decanter centrifuge are becoming more and more broad.
As a leading centrifuge manufacturer in China, we have independent R&D capabilities, mature processing platforms and global service networks, and have successfully provided high-quality equipment and technical services to thousands of companies. We sincerely invite partners at home and abroad to jointly explore, develop and realize new value in the field of solid-liquid separation.
