Decanter centrifuges process characteristics The separation process in a decanter centrifuge relies on a few process characteristics such as centrifugal force or force, sedimentation rate and separating factor, differential speed between the conveyor and bowl, and clarity of the liquid discharge. Decanter centrifuges require a centrifugal force for the separation of the solids from the liquid. This characteristic is dependent on the radius of the centrifuge and its angular rotational speed. A decanter centrifuge applies a force equivalent to several thousand , which reduces the settling time of the particles. It is also favored to maintain a large force, which will result in an improved separation. The rate at which sedimentation occurs is an important characteristic of the decanter centrifuge separation process. The sedimentation rate is influenced by the particle size, the shapes of the particles, their differential densities and the viscosity between the particles and the liquid. This process characteristic can be improved by utilizing flocculating agents. The sedimentation rate is also dependent on the separating factor of the decanter centrifuge, which is related to the centrifugal force. The exterior bowl and the scroll conveyor rotate at different high speeds. This differential speed between the two is accountable for the sedimentation throughout the decanter centrifuge cylinder. A high differential speed results in a smaller residence time of the cake settlement, so it is necessary to keep the cake thickness to a minimum to avoid impairing the discharge quality. Keeping the cake thickness to a minimum also aids in the improvement of the cake dewatering process. For this reason, it is necessary to obtain an optimal differential speed to balance the cake thickness and quality. The characteristic above all affects the clarity of the liquid output which is dependent on the volumetric throughout rate, where a higher flow rate will result in a poor liquid clarity. Another characteristic that influences the clarity of the liquid output is the differential speed. A low differential speed results in a better clarity, therefore, aiding in the separation process. The Force also plays a role in the clarity of the liquid discharge. Higher force results in an increase in the separation of the solid particles from the liquid and yields a better clarity.
The feed product is pumped into the decanter centrifuge through an inlet. Feed into a horizontal bowl and then rotate. The bowl consists of a cylindrical portion and a conical portion. The separation takes place in the cylindrical part of the bowl. Fast rotation produces centrifugal forces of up to 4000 x g. Under these forces, solid particles with a higher density are collected and compacted on the wall of the bowl. The scroll (also a screw conveyor or screw conveyor) rotates inside the bowl at slightly different speeds. This speed difference is called a differential speed. In this way, the scroll conveys the precipitated particles along the cylindrical portion of the bowl to the conical end of the bowl. At the smallest end of the conical portion of the filter bowl, dehydrated solids leave the filter bowl through the discharge port. The clarified liquid exits through the mating disc (internal centrifugal pump).
Decanter Centrifuge Features and Benefits: 1. Innovative design includes longer bowl, allowing drilling fluids to thread through more slowly, thus resulting in drier solids and finer separation point; 2. Big bowl offers big volume. It also generates high-G force; 3. Stainless steel bowl, scroll, compartment are available and covered with corrosion-proof coating so as to have longer lifespan; 4. Tungsten carbide scroll points with wide spacing flights at tapered end create a finer layer of conveyed solids for consistent, uniform separation and maximum solids control efficiency. 5. German FAG or Swedish SKF brand bearings are available; 6. Electrical Components complies with SIEMENS/Schneider ATEX or IEC Ex. 7. Screw pump and submersible slurry pump are provided to meet liquid feeding requirements of centrifuge of various customers
Oilfield Decanter Centrifuge Working Principle: Decanter Centrifuge is driven by two motors. The main motor drives the drum and the outer casing of differential through belts while the auxiliary motor, after the differential shifting speed, drives the spiral propeller. This will make the drum and the spiral propeller rotate in the same direction with a certain differential speed.
By separating the water and solids from the sewage, nightsoil, and livestock wastewater sludge as well as the sludge from a concentration and from the dewatering process, this centrfuge maintains a constant cake moisture content and recovery rate.
The Centrifuge can be used in various fields where various types and shapes of contrifuges are needed, such as in the sludge from civil engineering works and in the chemical, food processing, and steel industries.
It is used when the solids are in a poor condition because of extra sedimentation and the mixed sludge from livestock, nightsoil, andsewage treatment plants.
Our company is the largest producer of the decanter centrifuge in China! Sludge Decanter Centrifuges Features: 1. Designed with compact structure and pleasant appearance 2. With large processing volume and above 98% solid capture rate 3. Automatic control, which enables low operation intensity and reliable operation 4. With small space occupation, consecutive work and low noise level LW Horizontal Decanter Centrifuges feature continuous feeding and discharge . This chemical separation equipment has been applied two-phase(solid-liquid) and three-phase(solid-liquid-liquid) slurries separation industry of chemicals, pharmaceutical, environment protection, as well as mining and food, etc.
Description : LW Sedimentation Centrifuge is a horizontal, continuously working and continuously spiral discharging sedimentation centrifuge. It is used in a variety or industries for separating all kinds of solid liquid suspension, defecating liquid phase with graded grains, and dehydrating sludge.
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. Typical applications of 3-phase separation are the production of edible oils such as olive oil, oil sludge processing, the production of biodiesel .
Operating principle: The purpose of separation is to separate out substances with different mass ratios from mixed fluid.Separation forms included solid-liquid separation,liquid-liquid separation and liquid-liquid-solid separation. When mixed fluid enters rotating bowl of centrifuge through feed tube ,solids with larger density would rapidly deposit on inner wall of the bowl,forced by centrifugal acceleration.Then spiral pusher pushed deposited solids to taper end of the bowl,and discharges them out of centrifuge from residual outlet.Meanwhile ,liquid phase with smaller density forms a liquid ring layer and discharges from bowl through overflow port,the bowl and spiral pusher run at a high speed simultaneously ,for there exists speed discrepancy,deposited solids on the wall of bowl could be conveyed to residue outlet by spiral pusher.This separation process carry out continuously. 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.
Operating principle: The purpose of separation is to separate out substances with different mass ratios from mixed fluid.Separation forms included solid-liquid separation,liquid-liquid separation and liquid-liquid-solid separation. When mixed fluid enters rotating bowl of centrifuge through feed tube ,solids with larger density would rapidly deposit on inner wall of the bowl,forced by centrifugal acceleration.Then spiral pusher pushed deposited solids to taper end of the bowl,and discharges them out of centrifuge from residual outlet.Meanwhile ,liquid phase with smaller density forms a liquid ring layer and discharges from bowl through overflow port,the bowl and spiral pusher run at a high speed simultaneously ,for there exists speed discrepancy,deposited solids on the wall of bowl could be conveyed to residue outlet by spiral pusher.This separation process carry out continuously. 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.
Decanter centrifuge is typical drilling mud process equipment. It is 4th phase solids control equipment. Usually it's set behind AJC mud cleaner or desilter. Mainly separate 2~7 microns particles. The complet conveyor and bowl will be made of S. S to provide high resistance for drilling mud. Furthermore, according to clients' requirement the drilling mud centrifuge can be designed as VFD type. Permits easy adjustment of bowl, conveyor, and feed pump speeds for varying process conditions and provides torque overload protection. Features 1. High internal acceleration 2. Bowl speed up to 3200 RPM (MAX) 3. Compact portable unit 4. Adjustable height 5. Durable S. S material Benefits 1. Effective and efficiently 2. Separating finer particles, make centrifuge is suitable for weighted and un weighted mud 3. Save space and easy handling 4. Make transportation and installation convenient 5. High strength and corrosion resistance, decrease maintenance cost
Whole waste water treatment includes sludge feeding system,flocculant adding system,dewatering system,filter cake delivery system and PLC control system. The main equipment of sludge dewatering complete system is decanter centrifuge.There are basically two application types in the wastewater treatment industry for the decanter centrifuge: sludge thickening and sludge dewatering duties.Also .it can be used for Sludge classification and Sludge clarification. With the decanter centrifuge,it is possible to separate the particles from suspending liquid with equivalent diameter bigger than 0.003mm,solid-liquid weight ratio less than 10% or volume ratio less than 70%,difference in specific gravity bigger than 0.05g/cm3 Applications: Sludge dewatering complete system could be used in the following fields: Municipal sludge treatment,paper mill sludge,starch factory waste water treatment,stell mill sludge,printing and dyeing mill sludge,water works sludge,pharmaceutical waste sludge,PVC sludge,sewage desulfurization sludge,grain stillage,power plant ash sludge,dairy sludge,beer sludge,drilling fluid ,electroplating liquid,fermented liquid manure,oil refining sludge,soap sludge,leather sludge and etc. My Email:shenzhou61@126.com Mobile:8618041915856
Shenzhou Centrifuge has been dedicated to producing machinery and equipments and carrying out facility construction, pursuing the best quality and producing the best product at the same time.We are committed to reward you with a better quality in return for our interest in and faith toward.We will do our utmost for one more stepping forward, based on our infinite services and trust to customers. Description : LW Sedimentation Centrifuge is a horizontal, continuously working and continuously spiral discharging sedimentation centrifuge. It is used in a variety or industries for separating all kinds of solid liquid suspension, defecating liquid phase with graded grains, and dehydrating sludge. 2 phase Decanter Centrifuge: After entering into the high-speed turning drum, the solid-phase particles in the mixed liquid run and settle on the drum wallunder the action of greatest centrifugal force; the light liquid settles at the innermost place of the drum under minimum centrifugal force; same as the drum's turning direction, a screw feeder also turns at a high speed, and a constant speed difference is generated by the differential mechanism, then the liquid will be discharged by the liquid outlet. 3 phase Decanter Centrifuge: Principle of threephase decanter centrifuges is as shown in the above figure. The substance to be separated is fed by the feeding tube into the accelerating cavity of the spiral conveyor, then enters high speed running drum wall. As the light liquid, heavy liquid and insoluble solid contained in the substance have different specific gravities, the three materials are subject to varied centrifugal forces: the insoluble solid settles into the inner wall (outside) due to its highest specific gravity and subject to maximum centrifugal force; the light liquid settles maximum far away from the inner wall (outside) due to its lowest specific gravity and subject to minimum centrifugal force; and heavy liquid settles in the middle place. The insoluble solid is discharged from the solid discharge port by a spiral feeder which has relative differential speed with the drum; and the light and heavy liquids are then separated by different structures inside the machine wherein the heavy liquid is discharged by the centripetal pump, and the light liquid is discharged via the force of gravity, thus the purpose of three phase separation is achieved.
Olive Oil Separation Stainless Steel Decanter Centrifuge Olive Oil Separation Stainless Steel Decanter Centrifuge is used for solid-liquid-liquid separation, namely one kind of solid phase (with largest specific gravity ) and two kind of immiscible liquid phase with different density. The conveyor rotates in the same direction as the bowl, but at a different speed, the material is fed into the bowl through a stationary feed pipe. Centrifugal forces cause instant sedimentation of the solids on the wall of the bowl, while two liquid phases forming light liquid phase layer and heavy liquid phase layer. Scroll conveys the solids towards the conical end of the bow, and out of centrifuge from solid discharge port. The light liquid phase then is discharged out continuously through the overflow port at the large end of the bowl, and the heavy liquid phase will be discharged out through the centrifugal pump large end of the bowl, thus realizing the three-phase separation. When you need to separate solid / liquid mixtures with high solids content, you can choose a decanter centrifuge. In contrast to chamber filter presses, these solid vortex centrifuges or decanter centrifuges operate continuously. High centrifugal forces separate finely divided solid particles from the suspension.
Waste vacuum pump, also named as solids transfer pump. It is a pneumatic slurry transfer vacuum pump for liquid, slurry, and solids transfer. With special structure design, it can be used at tough environmental for solids transfer, high working performance and less maintenance. The pump can transfer material with high gravity and high density, solids content max. up to 80%. Material transfer applications: Waste mud and waste solids discharged from shale shaker, mud cleaner and centrifuge transfer Drilling mud transfer Waste pit cleaning Hazardous waste recovery Oil sludge, tank bottoms residual removal and transfer Barge holdings and vessel bottom clean out Bulk tank and silo transfer of material Sand; Course, fine, conventional and frac sand Diatomaceous earth Animal waste etc.
LW means horizontal spiral type which is a normal model of decanting centrifuge Solids. Decanter Centrifuge is the last stage equipment in drilling mud system for solids control and mud cleaning. The superiority of Decanting Centrifuge is embodied in the solids processing size. Decanter Centrifuge could remove the solid particles with size 2-7 microns using the principle of centrifugal action, it is an ideal choice for separating particles in drilling mud. Always there is a screw pump or submersible pump to feed the mud to Decanter Centrifuge. After the drilling fluids being fed into the centrifuge drum, under the function of centrifugal force, solid phase particles are pushed to the internal wall of the drum, then to the solid discharge export of the small end of the drum and excreted. While the fluids is excreted from the overflow hole of the large end. Such cycle is to achieve the purpose of continuous separation. High speed decanting centrifuge are more effective for separation of fine solids.
Our company is the largest producer of the decanter centrifuge in China! Sludge Decanter Centrifuges Features: 1. Designed with compact structure and pleasant appearance 2. With large processing volume and above 98% solid capture rate 3. Automatic control, which enables low operation intensity and reliable operation 4. With small space occupation, consecutive work and low noise level LW Horizontal Decanter Centrifuges feature continuous feeding and discharge . This chemical separation equipment has been applied two-phase(solid-liquid) and three-phase(solid-liquid-liquid) slurries separation industry of chemicals, pharmaceutical, environment protection, as well as mining and food, etc.
LWS 3 Phase Palm oil decanter centrifuge Palm Oil Separation Decanter Centrifuge with slow rotation speeds are normally based on horizontal separation technology. Decanter eusure optimum separation efficiency in the case of suspensions with a very high proportion of solid. They are also used for the extraction constituents from liquids and for concentrating, dewatering and classfying solids. Palm oil is popular in demand throughout the world. It plays a very important role in the food industry The valuable oil has also adopted in the production of soap, candles, cosmetics, biodiesel etc. Palm oil is obtained from the fruit of the palm fruits. the main producer countries are Malaysia, Indonesia, Columbia and Africa countries with tropical climate. The oil is processed whole the year and they are in non stop operations.
