Detailed Product Description

Application scope

LW Series Decanter Centrifugeare is a kind of horizontal solid-bowl scroll discharge sedimenting centrifuge. They can be continuously operated and can perform feeding, separating, washing and discharging in sequence at their full-speed running. They are suitable for separating the materials with their solid density larger than their liquid density, that is, the suspension with solid phase particle size of 0.005-15mm, consistency of 1-40% and temperature 100^oC max. They are suitable for chemical industry industry, light industry, pharmacy and food industry as well as environment protection.

Main technical characteristics

1. High rotational speed, high separating factor and big length-to-diameter ratio. For centrifuges with drum diameter below 600mm, their separating rotational speed is usually above 3000r/min, their separating factor is above 2500 and their length-to-diameter ratio can reach up to 5.2. Among them, the highest rotational speed of LW245x980-N can reach 5400r/min, and its separating factor is above 4000.

2. Big single machine processing capacity: The decanter centrifuge series with diameters of 245,380,450,520,650,720 and 1120 (mm) are all designed according to the newest fluid theory and with reference to the advanced structures abroad. They have a big capacity and fine separation effect.

3. Low vibration, low noises and big bearing capacity. Imported main bearings with high precision and big bearing capacity and used for this series. Precision of components is high. The entire machine gets precise dynamic balance through dual rotors, thus stationanty and reliability are guaranteed when it is running at a high rotational speed. With low vibration and low noises, all of its properties are higher than those stipulated in the National Standard.

4. With multiple protecting apparatus, reliable running is realized. The series of centrifuges are usually equipped with such overload protective devices as differential case or torque-limiter coupling. If required, other protection devices such as vibration protection, temperature monitoring and protection, and feed adjusting, etc. can be equipped, which are able to protect the entire machine by automatic alarm and forced stoppage.

5. Property of differential system is reliable. Differential case of satellite differential or cycloidal needle wheel differential is used. If necessary, fully hydraulic differential system is used. Mechanical differential cases of well-known national brands have been chosen, and hydraulic pressure differential system adopts the foreign brands. The differential case is of high precision, high performance and reliable operation.

6. Key parts are corrosion-resistant and wear resistant. The surface of screw, the inlet on the screw and the discharge outlet on drum are usually surfaced or bead weld with wear-resistant surface made of hard carbide. For the centrifuges on special occasions, wear-resistant blocks of imbedded hard carbide are adopted, or inlaid with wear resistant jacket or wear resistant ceramic plates, corrosive-resistant and lasting.

7. It has many modes of drive and speed regulation. According to different demands, corresponding drive, differential and speed regulation mode can be adopted to adjust the rotate speed of drum and its differential rotate speed so as to achieve the best separating results on different separating occasions.

8. Fine obturation and explosion-proof performance. Machines of obturation and explosion-proof type are specially designed for those special separating accessions inflammable and explosive. Mechanical seal can last no fewer than 8000 hours and gas seal no fewer than 15000 hours.

10. Advanced and reliable control system of electrical system equipment. Types of control of electrical equipment can be classified as conventional, explosion-proof and fully automatic control with computers. CDS central control can also be selected for remote supervisory and controlling and full-automatic operation. All the electrical components of the electrical control system are either imported from abroad or of famous brands at home, which perform well.

11. Materials of high quality have been used. Austenitic stainless steel is usually used for the parts of machines that suspensions touch. These parts have high strength and good ability to resist corrosion.

Application Conditions and Suitability Adjustment of the Decanter Centrifuge

1. The basic application conditions for the decanter centrifuge.

(1.) The materials to be separated should be solid-liquid intermixture such as suspension, not emulsion.

(2.) There must be a certain differential which big in 0.06g/cm3 density between all the phases composing suspension or intermixture.

(3.) The suspension concentration should be 1-40%.

(4.) The partial size of solid phase should be 0.005-15mm.

(5.) The work temperature in the process of separating should be ≤100.C.

(6.) Approach viscosity.

(7.) Uses for: dewatering of solid phase, clarification and separation of liquid phase, liquid-liquid-solid three-phase separation and size-grading.

2. Different materials separated have different characteristics. Even the same material displays different separating properties when separated by different techniques or on different conditions. The quality of the separating characteristics will have direct influences on the separating results of the centrifuge and its separating capacity.

3. Sedimentation speed is an important index to measure separating characteristics of materials separated, which plays an important role in sedimentation separation. Sedimentation speed mainly depends on the size solid-phase particles, their shapes and differential density and viscosity between solid and liquid, ect. Thus, it can be adjusted and improved by taking the following measures:

(1.) Adjust work conditions to improve viscosity and increase the differential density between liquid and solid.

(2.) Add flocculating agent to increase the size of solid particles and change their shapes.

(3.) To those materials difficult to separate, besides adjustment of the materials separated centrifuges may also be adjusted and improved.

(4.) Increase length-to-diameter ratio.

(5.) Adjust rotate speed of drum.

(6.) Adjust differential speed of drum with discharge screw.

(7.) Change angle of slope of drum in cone section.

(8.) Adjust overflow radius of liquid phase outlet.

(9.) Change the number of screws of discharge screw and helix angle.

(10.) Increase BD plate structure.

5. As for the adjustment of technical parameters and improvement of corresponding parts of a centrifuge, all must be fixed before manufacturing it except that separating rotate speed, different rotate speed and overflow radius of liquid phase outlet can be changed a little on the separating field. Whats more, for the different corrosion of materials separated, corrosion-resistant materials of different kinds can be used. So when customers ask for information, please tell us in details about natural parameters, work condition and separation requirements, etc.