Decanter Centrifuge Speaks Loudly in ADIPEC

speak! Comparing Chinese CIPPE and other exhibitions all over the world, that become a policy of GN Solids Control. This simple sentence is right the one GN Solids Control 's essence, no matter our stretage: The one inside wall will finally know if the flower blooms outside.  Or what we insist: Quality first, price second.

Still the same, the market get more and more competitors, lots of them have stronger financial support, maybe better payment term, maybe more fancy exhibition booth. Whatever, we still focus on one simple thing: make top quality products. 

This time we brought the most popular product in our company: GNLW363 decanter centrifuge :

Typical speed:  fixed speed, 3200rpm. ( Belt pulley with 2700rpm/2500rpm/2200rpm is also available if request by customer)

Bowl diameter and bowl length: 14 inch and 50 inch.  This size is much similar as Derrick DE1000 centrifuge and Swaco 518HV centrifuge .

Effective treating capacity: 30cbm/h.  This capacity is also similar as Derrick DE1000 centrifuge and Swaco 518HV centrifuge.

A lot of clients are invited to our booth, to check the centrifuge, to meet with each other, talk about business face to face. Just busy! Then also, getting more and more business. 

ADIPEC maybe not so big liek CIPPE, or OTC, but is an exhibition focused on local market, nearly all the clients keep going there every year, to meet with customer, suppliers, or just walk around to find something new. GN SOLIDS CONTROL have been there 3 times count on this one, and it is getting better and better, a lot of customer just expecting to meet with us there. It cost far less then check the factory in Beijing. 

We just proceed another lot decanter centrifuge manufacturing, but it is already sold out. Preparing another lot proceeding, if you get any related inquiry, pls let us know in advance. 

Three-dimensional Screen Panels

Several types of bonded screens are available. The repairable perforated shaker screen has one or more layers of fine mesh cloth bonded to a sheet of metal or plastic with punched, patterned holes. Perforated plate designs are available in various opening sizes and patterns. Additional designs include a special application where backing and fine screen(s) materials are bonded together, eliminating the need for perforated plates. Flat-surfaced, pretensioned screen panels are becoming popular because of their even tensioning, easy installation, and the even  distribution of liquids and solids across the screen deck.

Three-dimensional screen panels were introduced in the mid 1990’s. These typically of fer more screening area than flat-panel, repairable plate screens while retaining the ability to be repaired.

This type of screen panel adds a third dimension to the previous twodimensional screens. The screen surface is rippled and supported by a rigid frame. Most three-dimensional screen panels resemble the metal used in a corrugated tin roof. Construction consists of a corrugated, pretensioned screen cloth and bonded to a rigid frame.

Like bonded flat screens, the three-dimensional screen panel needs only to be held firmly in place with a hookstrip or other means to prevent separation between the shaker bed and the screen panel during vibration. Three-dimensional screen panels can be used to support any type or style of wire cloth and can be used with any type of motion. Three-dimensional screen panels allow solids to be conveyed down into the trough sections of the screen panel. When submerged in a liquid pool, this preferential solids distribution allows for higher fluid throughput than is possible with flat screen panels by keeping the peaked areas clear of solids control. A three-dimensional screen panel improves distribution of fluid and solids across the screen panel. This reduces the characteristic “horseshoe effect ” caused by shakers using crowned screen beds.

Decanter Centrifuge G force on Separation

Since G-force increases with the square of bowl RPM, it is an important parameter. G-force also increases linearly with bowl diameter. shows how solids removal efficiency improves with increasing G-force. For a given particle size and fluid properties, there is a minimum G-force necessary to invoke settling. Although high G-force is desirable, the cost is proportional to the cube of the bowl rpm and there are similar economic limitations on bowl diameter as well. Thus, the required G-force must be obtained from a practical combination of speed and diameter. Most oilfield centrifuges have bowl dimensions from 14 to 28 inches in diameter and lengths from 30 to 55 in. Rotational speeds range from 1000 rpm to 4000 rpm, depending on the application.

From Stokes Law, particle settling velocity is inversely proportional to fluid viscosity. The following figure illustrates the beneficial effects of a feed mud with a low yield value. This shows the merit of diluting the centrifuge feed to improve performance. It also helps explain the relatively poor performance of centrifuges when processing polymer fluids with characteristically high viscosities at low shear rates.

Discharge dryness is commonly considered a direct indication of centrifuge performance. However, test results have shown that cake dryness is more correctly a function of particle size, and therefore, is inversely related to separation efficiency. Test points have yielded the driest solids control corresponded to the lowest efficiency and coarsest D50 separation. As shown in Figure 3, Solids dryness occurs at a threshold Gforce level. Subsequent increases in G-force do not remove additional liquid. Length of the dry beach within the centrifuge bowl (a function of pond depth) also has little effect on dryness. Dry beach length refers to the distance from the solids discharge ports to the surface of the fluid pond within the centrifuge bowl. But the small difference in dryness made a significant difference in the appearance of the solids. At 71% by weight, the solids were quite runny and at 75% weight, the solids seemed much more “stackable”.


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