Month: August 2017

Many people can easily know how to choose a decanter centrifuge, but it is a little difficult for them to select a suitable model of centrifuge. Here is a simple method to judge a proper model for you.

First, the model of a decanter centrifuge represents the following meanings: For example, LW450*842, a model of decanter centrifuge, among which L means Luoxuan in Chinese Pinyin, W means Woshi in Chinese Pinyin, 450 means the bowl diameter of decanter centrifuge, and 842 means the bowl length of decanter centrifuge.

A suitable model of decanter centrifuge can not only solve production problems and improve work efficiency, but also save production cost and reduce business risks. Several main factors that determine the centrifuge model are as follows:

1. Speed of decanter centrifuge: The speed of a common decanter centrifuge is more than 2000RPM. For some materials hard to separate, a higher speed is required. The higher the speed is, the higher the separation factor of centrifuge, the better the separation effect.
2. Material of decanter centrifuge: PH value of materials to be treated determines the bowl material of decanter centrifuge. Different materials have diverse physical and chemical indexes in their abrasion and corrosion resistances. Overseas decanter centrifuges are generally made of 316L or duplex stainless steel, with wear parts made of ceramic materials.
3. Differential control of decanter centrifuge: Different differentials have different control accuracies, service lives and maintenance costs. The higher its differential accuracy is, the better its adaptation to materials is. So it is advisable to select equipment with a high differential accuracy.
4. Length-diameter ratio: The bigger the length-diameter ratio of decanter centrifuge is, the higher the handling capacity is, the lower the moisture content is.
5. Control system: At present, almost all of equipment manufacturers at home and abroad have achieved a full automatic control over the equipment.
6. Installed power: As for a control over energy consumption, generally speaking, domestic equipment has a higher energy consumption ratio, while foreign equipment has a lower one.
7. Manufacturing technique: Since a decanter centrifuge is a kind of separation equipment with high precision machining requirements, the centrifuges manufactured by enterprises without a precision machining capability will suffer from a high maintenance ratio and a restricted handling capacity.

Kosun- Solids Control Company

In the whole markets, centrifuge or even decanter centrifuge has been used in most fields. There are also mutual types or styles of decanter centrifuge in different fields. We just take oil drilling industry as an example,there are RFD decanter centrifuge, VFD decanter centrifuge, Disc centrifuge, hydraulic centrifuge, etc.

Now KOSUN want to share some necessary tips about safety operation regulation for decanter centrifuge. The following content is about the topic of “6 Tips of Safety Operation Regulation for Decanter Centrifuge”.

Just as we all know that Decanter Centrifuge is one kind of machine revolving at high speed. During operation, revolving drum will generate strong centrifugal force (it is not like the solid control system, to some extent, decanter centrifuge is a core part for a whole solid control system and water based mud unit). To ensure the safety of operators and equipment, the following safety rules shall be strictly followed when using it.

1. Pay more attention for original Instruction Orders or Steps. Through dynamic balance of revolving drum parts of centrifuge, during assembly, original installation order shall not be changed and there shall be no parts omitted. Threaded connection part shall be installed in place; during assembly, if there is assembly mark, the mark shall be aligned. Before startup, operating pump system shall be inspected and there shall be no water leakage under close state of magnetic valve.
2. Keep the decanter centrifuge off. Before clamping revolving drum clamp ring and fixing inlet/outlet device and other fastening screws, decanter centrifuge shall not be started.
3. Before completely stopping revolving drum, any part of equipment shall not be loosened.
4. During operation, if abnormal vibration of decanter centrifuge is found, power shall be cut off for emergency shutdown. After revolving drum is completely stopped, each part shall be disassembled cleaned and inspected and attention shall be paid to assembly order and position. After the causes of abnormal vibration are found out and removed, reassembly and startup can be carried out. Time interval between re-startup and shutdown shall be more than 4h (This item is also suitable for mud cleaner).
5. Flame heating or repair welding of main revolving drum parts is not allowed, especially revolving drum body, revolving drum cover and clamp ring.
6. Use of revolving drum parts and revolving drum parts of other equipment shall not be mixed, even the revolving drum parts with same model.

The above 6 tips or we can call it as steps should be kept in our mind, they can help us improve our working efficiency. Just as I mentioned in the post, you could find more information about solids control system, drilling waste management unit, oil recovery unit, and some other solids control equipment, such as mud cleaner, sand pump, vacuum degasser, cutting dryer, etc. In another words, KOSUN could be your better cooperator.

The operation of a decanter centrifuge can be either batch or continuous and is not altogether dissimilar to other types of centrifuges. A metal or plastic cylinder fixed along a central axis houses the materials or solutions to be sorted. When a motor engages the axis perpendicular to this, it creates a rotational movement capable of creating gravitational pulls up to twenty thousand times that of normal gravity. This causes larger particles to separate out first in a radial direction allowing them to move toward the bottom of the cylinder while lighter materials move toward the top.

In some decanter centrifuges a mesh is used to collect solids with liquids passing through to the outer area of the cylinder before being drained. In other models a helical extraction screw directs solids to one end and liquids to the other. If high enough acceleration is reached, the solids may even become compressed for easy removal. Both new and used centrifuges are available to purchase. As adjustable and fixed acceleration models are widely available, it is important to consider the parameters of a specific application before purchasing a decanter centrifuge. Capacity should also be considered with regard to the intended use as should the design and material construct of a decanter centrifuge as these materials must be compatible with both process liquids and solids to be sorted.

Decanter centrifuges utilize centrifugal force to speed the dewatering or thickening of slurries and suspensions in many industrial and commercial applications. While these centrifuges, like others, may also be used to separate liquids from liquids, they are more applicable in situations that require the separation of liquids from appreciable amounts of suspended solids.

Food and beverage, water treatment, oil, gas and pharmaceutical industries commonly employ decanter centrifuges for the classification of solids based on the sedimentation principle as well as the clarification of fluids resulting from the settling out of debris. Other industrial uses for decantation include solids recovery which enables many manufacturing facilities to recover and reuse valuable materials that would otherwise be disposed of along with wastewater.

While gravity alone is sometimes used, decanter centrifuges are essential in applications where the density difference of elements within a heterogeneous mixture is too small or the particles themselves are too small. Whereas normal gravity could take ages to sort these materials, the centrifugal force generated by industrial centrifuges speeds the process while producing drier solids. Dryness is important as both dewatering and drying materials helps to provide raw or processed substances that are lighter in weight than their immersed counterparts making for easier handling and lower transportation costs.

Kosun- Solid Control System Company