GN Company is a professional manufacturer of Decanter Centrifuge from China Mainland, and has rich experience of about 10 years, and now has developed three factories in China, and two branches in the USA and Russia.

GN Technical Team has been focus on research and develop the centrifuge technology for about 10 years, and here are some introduction about two important items, which GN Team has experience.

1. Control of tempering effects

The larger the solid phase particles in the material; the greater the difference in gravity between the liquid and solid phases, and the smaller the viscosity of the suspension, the easier it is to separate, otherwise it is difficult to separate. For this reason, before the suspension enters the decanter, the separation conditions can be improved by appropriately increasing the feeding temperature of the material to reduce the viscosity or by adding flocculent to coagulate the solid phase.

Centrifugal dehydration generally uses high-efficiency synthetic polymer flocculants instead of inorganic salts. The reason is that the addition of inorganic coagulants will make the sludge volume expand, and the centrifuge is closed forced dewatering, which has stricter requirements on the amount of sludge, so if inorganic salt coagulants are used, the dewatering of the centrifuge will be reduced Ability is greatly reduced.

2. The control and comprehensive regulation of the amount of mud feeding

Each centrifuge has a maximum amount of mud feeding. When the actual mud feeding amount exceeds this value, the centrifuge will lose the dynamic balance of solid phase and liquid phase, and will be damaged in severe cases. Therefore, the decanter should be strictly controlled during operation.

Within the allowable range, when the mud quality and conditioning effect are constant, the larger the amount of mud, the lower the solid recovery rate and the solid content of the mud cake. volume will increase.

In addition, each decanter has a limiting maximum solids flow. If the solid content of the inflow exceeds the limit value due to the increase of the solid content of the sludge, etc., the centrifuge will be overloaded and stop due to excessive torque.

The method of selecting the appropriate feed flow rate: first adjust the feed flow rate to a smaller value, then start the decanter and work for a period of time until the speed of solid phase discharge is constant. Observe whether the solid phase discharge amount and discharge speed are appropriate. If not, change the feed flow accordingly until the solid phase discharge amount and discharge speed are appropriate. The feed flow rate at this time is usually an appropriate value. Sometimes this value can be small.

For example, for a decanter with a processing capacity of 10m3/h, due to the high solid content of the feed suspension, the actual suitable feed flow rate may only be about 2m3/h.

Since the inflow solid content is constantly changing, it is not certain whether it will exceed the limit value. Or if there is no inflow solid content measurement on site, do not adjust the feed flow to the maximum flow rate of the decanter to prevent the over-torque failure of the decanter.

Welcome to contact GN Sales Managers, and they would offer one stop turkey solution based on clients' requirement.

GN Company has supplied one unit of 2-phase Decanter Centrifuge, with bowl diameter 220mm, and capacity 1000liters per hour for client in Europe. Here GN Engineers would like to introduce more technical details about Decanter Centrifuge.

In actual operation, the mud quality and mud amount of the sludge will change. In order to ensure that the dewatering effect remains unchanged, the user can choose a reasonable price according to the material properties of the suspension, the requirements of the liquid and solid phases after separation, and the processing capacity. Select the relevant parameters of the centrifuge, such as: processing capacity, drum speed, differential speed between the drum and the screw, overflow plate diameter, etc., to obtain a satisfactory separation effect.

If the drum of the centrifuge is driven by a frequency converter, the speed of the drum can generally be adjusted stepless within a large range. By adjusting the speed, the separation factor of the centrifuge can be controlled to adapt to the requirements of different separation liquids. Generally speaking, the larger the solid phase particles in the separation liquid, the greater the density, and the lower the separation factor is required, and vice versa, the higher the separation factor is required. With the increase of the rotating speed of the drum, the separation factor increases, the separation effect improves (after the differential pulley is determined), the differential speed between the screw and the drum increases, and the processing capacity increases, but the vibration, The noise will also increase and the service life will decrease. Therefore, it is very important to select the appropriate speed under the premise that the separation requirements can be met. If the drum is not controlled by frequency conversion, its rotational speed is fixed, that is, its separation factor is fixed.

Best & Regards,

Kevin Liu

Regional Manager

GN Separation & Conveying

Hebei GN Separation & Conveying Equipment Co.,Ltd

Tel:+86-316-5276988/9

Mob (WhatsApp/Wechat): +86-15810901775

Email: This email address is being protected from spambots. You need JavaScript enabled to view it.

GN China: www.gnseparation.com (Langfang/Beijing)

GN USA: www.gnsolidsamerica.com (Houston, Texas)

GN Russia: www.gnseparation.ru (Moscow City)

GN Company is professional manufacturer of Separation Equipment, including Solid-Liquid separation, Liquid-Liquid separation, Solid-Liquid-Liquid separation.

Regarding to Decanter Centrifuge, the larger the diameter of the drum, the greater the processing capacity of the centrifuge. The longer the length, the longer the sludge stays in the drum and the better the separation effect. However, when the centrifuge is too large, the manufacturing and processing costs will also increase.

The rotating speed of the drum is an important process control parameter. From the separation factor formula mentioned above, it can be seen that under the guarantee of a certain centrifugal separation effect, the speed depends on the diameter of the drum. The smaller the diameter, the higher the required speed. Conversely, the larger the diameter, the required speed is also lower. Generally, the radius of the horizontal screw machine with small processing capacity is small, but the rotation speed is higher than that of the horizontal screw machine with large processing capacity.

The hollow shaft screw conveyor not only mixes sludge, but also produces centrifugal force of the sludge. At the same time, it is also responsible for transporting the sludge in the solid ring layer away from the liquid ring layer to realize the separation of sludge and water. At the cone angle of the rotating drum, the diameter of the spiral begins to decrease, and the sludge is dried out of the liquid ring layer. The cone angle is generally between 8 and 12 degree.

The difference between the rotation direction of the screw and the speed of the drum is the speed at which the sludge is output, which determines the length of time the sludge stays in the machine, so it is an important process control parameter. In addition, the overflow adjustment weir can be used to adjust the thickness of the liquid ring layer, which is also an important process adjustment parameter. By adjusting the thickness of the liquid ring layer, the residence time in the drying zone can be changed.

Best & Regards,

Kevin Li

Regional Manager

GN Separation & Conveying

Hebei GN Separation & Conveying Equipment Co.,Ltd

Tel:+86-316-5276988/9

Mob (WhatsApp/Wechat): +86-15810901775

Email: This email address is being protected from spambots. You need JavaScript enabled to view it.

GN Company is a professional manufacturer of Centrifuge/Separator, and now has owned 3 factories in China Mainland. GN Company now is capable to manufacture Decanter with bowl diameter from 220mm to 760mm, with capacity 1-2 cubic meters per hour to 120 cubic meters hour maximum. GN Company is now capable to manufacture both two-phase Decanter Centrifuge (for separation of solid and liquid) and three-phase Decanter Centrifuge (for separation of solid, light-liquid, and heavy-liquid).

The drum of Decanter Centrifuge is a combination of a cylinder and a cone, in which the cylindrical part is the sedimentation zone, and the cone part is the dry zone, also known as the shore zone and the beach.

The hollow spiral has four open grooves along the axial direction, and the two adjacent open grooves form a 90-degree angle with each other, and the four open grooves run through most of the length of the helix. The advantages of this structural design are that the spiral weight is relatively light and has good mechanical properties; on the other hand, the open groove provides a considerable flow area and a soothing flow channel, which well protects the floc from The outside of the centrifuge is not damaged when it enters the centrifuge, which reduces the moisture content of the sludge and greatly reduces the amount of flocculant.

Centrifuge outlet mud scraping device: The sludge separated by the centrifuge will cling to the inner wall of the mud collection chamber under the action of extremely high centrifugal force, and it is easy to block the mud outlet of the centrifuge, especially when After the centrifuge stops working for a period of time, the sludge at the end of the centrifuge's sludge discharge port is very easy to dry and adhere to the body, blocking the sludge outlet of the dewatering machine, making the treated sludge unable to discharge and causing the centrifuge to fail to work normally. This sludge scraping device can slowly and continuously scrape the sludge attached to the inner wall of the sludge discharge end of the centrifuge, so as to ensure the smooth sludge discharge of the entire centrifuge.

Best & Regards,

Kevin Liu

Regional Manager

GN Separation & Conveying

Hebei GN Separation & Conveying Equipment Co.,Ltd

Tel:+86-316-5276988/9

Mob (WhatsApp/Wechat): +86-15810901775

Email: This email address is being protected from spambots. You need JavaScript enabled to view it.

GN China: www.gnseparation.com (Langfang/Beijing)

GN USA: www.gnsolidsamerica.com (Houston, Texas)

GN Russia: www.gnseparation.ru (Moscow City)