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Decanter centrifuge new type

Decanter centrifuge new type

The centripetal pump structure has better separation effect and meets the requirements of customers for liquid clarity!



How does it work

How does it work

The feed product is pumped into the decanter centrifuge through the inlet. Feed goes into a horizontal bowl, which rotates. The bowl is composed of a cylindrical part and a conical part. The separation takes place in the cylindrical part of the bowl. The fast rotation generates centrifugal forces up to 4000 x g. Under these forces, the solid particles with higher density are collected and compacted on the wall of the bowl. A scroll (also screw or screw conveyor) rotates inside the bowl at a slightly different speed. This speed difference is called the differential speed. This way the scroll is transporting the settled particles along the cylindrical part of the bowl and up to the end conical part of the bowl. At the smallest end of the conical part of the bowl, the dewatered solids leave the bowl via discharge opening. The clarified liquid leaves through a paring disc (internal centripetal pump)

3-phase separation with a decanter:

With a 3 phase decanter centrifuge, it is possible to separate 3 phases from each other in one process step only. For example, two liquids which cannot be mixed because of different densities (e.g. oil and water) are separated from a solids phase. The heavy liquid (water) collects in the middle between the oil and the solids layer. Thus the two liquids separated from each other can be drawn off from the decanter. The solids are transported via the scroll to the discharge openings as it happens also in 2-phase separation.[2]

Typical applications of 3-phase separation are the production of edible oils such as olive oil, oil sludge processing, the production of biodiesel etc.

Parameters and influencing factors of the separation

Parameters and influencing factors of the separation

Feed, throughput and residence time

Through the feed, the separation medium to be processed can be input into the centre of the infeed chamber of the scroll, where it is accelerated. The throughput will have an influence on the residence time.[3]

Acceleration

The separation medium reaches its maximum speed in the decanter bowl, causing the solids to settle on the bowl inner diameter. A characteristic feature of the bowl is its cylindrical/conical shape.

Differential speed

There is a differential speed between the decanter bowl and the scroll, which is created by a gear unit on the industrial decanter centrifuges. The differential speed determines the solid content in the outfeed.

Filling volume / Weir discs or overflow weir

Pond depth / Weir discs

The clarified liquid flows to the cylindrical end of the bowl in the decanter centrifuge, from where it runs out through openings in the bowl cover. These openings contain precisely adjustable weir discs/weir plates by means of which the pond depth in the bowl can be set. The weir discs determine the filling volume of the bowl.

2-phase separation with a decanter:

Horizontal decanter centrifuge is mainly used for solid- liquid separation and concentration of sludge wastewater, with advanced structure, large handling capacity and long design life. 

LW series decanter centrifuges usually used dewatering and thickening purpose. It is widely used for maximum dewatering requirements of municipal and industrial wastewater sludge.

 

Large size, medium rotating speed of 2000-2200r/min , large processing capacity, large aspect ratio, continuous oper-ation, stable operation, large production capacity, convenient maintenance, and two aspect ratios.

 

ln the actual project, it has been used in the following industries: ceramics, thermal power plant desulfurization, particle classification, magnetic particle treatment, sewage treatment, pharmaceutical, food, laboratory,petroleum, new energy, biology, chemical fiber, polymer materials, leather, cosmetics, printing and dyeing, knitting, etc.

Operating Principle

Working Procedure
Decanter can use limit space to fit together different stages of separation.


Mixing And Accelerating Stage
Sludge and chemical mixes in the specially designed feed chamber and accelerates together. This prepares the sludge for best separation.


Clarifying Stage
The flocculants sediments inside the bowl under centrifugal force, the clear liquid flows out of the weir an the end of the bowl.


Pressing Stage
Conveyor pushes the solid toward the discharge end. The sludge is further pressed by centrifugal force and the water comes out of the small holes of the sludge


Double-Direction Pressing Stage
In the conical part of the bowl wall, the sludge is pressed by specially designed double direction pressing effect. The specially designed conveyor produces axial pressing force and water comes out of the tiny holes of the sludge.
Control the Staying Time of Solid In order to achieve best dewatering effect when flow rate or character of sludge changes, the solid content inside the bowl should be continuously controlled.This is controlled by the drive system of the conveyor. The drive system of the conveyor can measure real-time the solid content inside the bowl and adjust automatically, solid discharge torque automatically compensated


Drive Technology
The reliable and excellent operation needs good cooperation of bowl drive and conveyor drive, Shanghai Centrifuge Institute researches good drive combination, which can be recommended as best design to suit different applications.

 

Bowl Drive System Alternatives Includes:
AC Motor+ Frequency Converter
AC Motor+ Hydraulic Coupling
Other Special Ways
Conveyor Drive System

Separation Technique
Feeding-gravitational separation-liquid discharge-sediment discharge.
Separation effect factors Centrifuging factor ,length to diameter ratio of cavity ,depth of fluid pool.


Field Control
Bowl rotating speed ,rotative speed difference,between,spiral pusher and bowl depth of liquid pool.

In the production of surimi, the shredded fish fillets will go through two to three cleaning processes. In this process, impurities such as blood and fat are washed away. The washing water is usually roughly filtered through a rotating sieve. In traditional surimi production, the dehydration of fish meat is done by a screw press. The meat is then treated with antifreeze and deep-frozen. This surimi production method has many disadvantages: Different washing stages and screw pressing process lead to a large amount of fish fiber loss 1.Need a lot of cleaning water 2.Huge space requirement 3.The raw material is easy to be infected with bacteria The Shenzhou decanter centrifuge can solve all the above problems. In the production of surimi, the decanter centrifuge can not only recover the fish meat from the washing water, but also replace the screw press. In this way, the output rate of the surimi production process can be significantly improved.

1, Helical pusher adopts the special antifriction method: sprinkle hardness alloy or inlay hardness alloy anti-friction disk; anti –corrosion stainless steel is employed for the material of the main parts of drum, so that assure the durability and longer using lifetime of the equipment.

2, According to the operating condition’s characteristics of material, optimize the drum length-diameter raido, drum and structure
of drum taper parts.

 

Main Technical Features

1. Industrial Design

Whole machine set design follows concept of advanced industrial design,ensures stability,functionality and safety of whole machine.Also effectively absorbs shear force of dynamic load during operation.


2. Effectively Ease Resonance During Rotating Of Bi-Rotor

When centrifuge works,there is no obvious first-order and two-order resonance regions within designed speed range,meanwhile ,whole vibration intensity of bearing seat is definited within 2mm/s-4mm/s.All of this eliminates extra fatigue damage to components and assembly units from high frequency vibration during operation and sudden vibration when shut down.

3. Thoroughly Eliminate Phenomenon Of Liquid Ring Stalling

Phenomenon of liquid ring stalling happens during heavy duty boot or shutdown process of complete set machine,especially for LW550 and even larger models,It would makes bounce or wild shake,causes extra impact fatigue damage to main bearings,screw bearings and inner parts of rotary bowl.Fortunately ,our engineers have solved this problem thoroughly.
4. Unique Technique Adopt In Main Component Work-Blanks

The manufacturing methods of main component work-blanks are adopt centrifugal casting technique and overall mould-making forging technique,thoroughly avoid risks such as inter-granular corrosion and relaxation of residual stress release in welding joint.

5. Main Bearing Selection

We use origin bearings of international first-line brands such as SKF,FAG and so on.

6. Constant Temperature Detection

All fashioning components and assembly units are detected in constant temperature condition,to make sure of actual processing quality meets the requirements of designed precision accuracy.

7. Inter-Change Ability

Whole machine physical design and processing technique adopted in critical position,ensure all assembly units and bowls of the same centrifuge model interchangeable.It is not only easy to maintain ,but also greatly improve the reliability and safety of equipment.

8. Simplyand Safely In Bearing Disassemblement

One layer of oil film is injected into contact surfaces between bearing and work-piece by high-
pressure,during disassemblement bearing from the machine.which would fundamentally eliminate friction within different parts.As a result,it would reduce 90% of pulling force and lower the risk of damage to high-precision parts when disassemble bearing.
9.Main Bearing Lubrication System
There are two kinds of lubrication system for specific product models :
A Thin Oil Lubrication
* Oil pump offers an uninterruptedly power to ensure oil works circularly;
* Jet oil lubrication constantly clean and lubricate bearings and reduce temperature;
* Oil filter system ensure lubricant’s cleanliness;
* Oil pressure energy storage system ensure lubrication pump offers an extra oil supply(the pressure is no less than 0.4Mpa) for 5-6 minutes,when power fails accidentally;
* Constant temperature system is available.


B Grease Lubrication
* Adopt a grease with properties of extreme pressure resistance ,oxidation resistance ,abrasion resistance,water scour
resistance,corrosion-proof and high temperature resistance.
* Optional automatic grease system fills grease on main bearing at designed hours and quantity.

10. Main Bearing BH Device (Patent Design)

There are two spare safe bearings at either end of main bearing.When machine works well,they keep certain clearance from bearing inside track to chief axis.When unexpected condition occurs,main bearing got damaged or circle center deviation causing an amplitude of vibration reaches to designed clearance,safe bearings begin to work as main bearing Meanwhile,computer automatic control system would get a feedback of abnormal vibration value on bearing position immediately then activates emergency shutdown and goes a smooth shut down.This system protects machine free from damaging and ensure production safety.

11. GSRL Feeding Device (Potent Design)

New design of internal spiral core tube has got following achieves.Without reducing centrifugal acceleration,shorten triangle belt's traction time,reduce disorder of swirling flow and extend separation time.Meanwhile increases inner working pressure of centrifuge,and restrains liquid foaming.

Application

Wastewater Treatment:

• Sludge dewatering.

• Municipal and industrial wastewater treatment.



Oil And Gas Industry:

• Separation of oil, water, and solids in drilling mud.

• Recovery of drilling fluids.

• Oil and gas processing for solids removal.



Chemical Processing:

• Clarification of chemical suspensions.

• Separation of fine particles and liquids.

• Solids-liquid separation in chemical manufacturing.



Food And Beverage:

• Clarification and purification of beverages.

• Separation of solids from food processing liquids.



Pharmaceuticals And Biotechnology:

• Bioprocessing applications.

• Clarification and purification of pharmaceutical products.



Mining And Minerals:

• Separation of valuable minerals from ore.

• Tailings dewatering.



Environmental Remediation:

• Treatment of contaminated groundwater.

• Soil washing and remediation.



Pulp And Paper Industry:

• Removal of fine solids from pulping processes.

• Recovery of fibers from paper mill effluents.

 


Chemical And Petrochemical:

• Solids-liquid separation in chemical and petrochemical plants.

• Removal of impurities from process streams.



Biomass And Renewable Energy:

• Processing biomass for biofuels.

• Separation of algae and biomass in renewable energy production.



Mining And Drilling:

• Solid-liquid separation in mining operations.

• Drilling fluid recovery in oil exploration.



Paints And Coatings:

• Clarification and purification of paint and coating formulations.

• Removal of solids from paint manufacturing processes.



Dairy Industry:

• Separation of milk and cream.

• Whey processing.



Textile Industry:

• Separation of dyestuffs and pigments.

• Wastewater treatment i

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