Horizontal Decanter Centrifuge's Working Principle

Horizontal Decanter Centrifuge's Working Principle

1). The Separation principle

The separation of liquid and solids is finished in the drum bowl. The high speed drum bowl take the inner drilling fluid rotate in a high speed.  Then the drilling fluid was thrown of to the drum wall and form a fluid ring.  The solid phase in the fluid ring are subjected to centrifugal forces hundreds or even thousands of times greater than their own gravity. The solids particles break the resistance of  fluid viscosity and to the inner wall form a solid layer, and the liquid form a fluid layer.  The ratio of the centrifugal force to the gravity of the solid particles in the fluid ring is called the separation factor of the Decanter Centrifuge. The bigger separation factors, the thinner of  separation particles.  In the oil drilling, the decanter centrifuge can be divided i three types.

a).  Lower speed centrifuge. This type decanter centrifuge is also called barite recycle centrifuge. Its separator factor is 500-700. For the lower density solids phase,  its separation size is 6-10 micron meters. For the higher density solids phase, its separation size is 4-7 micron meters.

b). Middle speed centrifuge. This type decanter centrifuge is 800, it can separate 5-7 micron meters' solids. This type is the most using one, using in removing the harmful solids, control mud density and viscosity.

c). High speed centrifuge. This type's centrifuge's separation factor is 1200-2100, the separation size is 2-5 micron meters, and also using in removing the harmful solids. control the mud density and viscosity. It is commonly used in series with low-speed centrifuge to form a two-engine system.  In this system, the lower speed decanter centrifuge is the first phase, the separation barite is sent back to the mud tank to recover the barite.  The liquid discharged by lower speed centrifuge is into a buffer tank. Then using a pump to suction this fluid to feeding in high speed decanter centrifuge. After the high speed decanter centrifuge, the solids is discharged to outside of tank, and the liquid into the recycling system. Using two equipment, both can remove the harmful solids, also escape the waste of barite.

The high speed centrifuge also has VFD type. The frequency can be adjusted.

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Website: www.jxsolidscontrol.com

Email: alisa@jxsolidscontrol.com

Decanter Centrifuge is Solids Control Industry

Decanter Centrifuge's usage in solids control industry

Since the lats 1980s, Decanter centrifuge has been widely used in the national oil industry(especially in deep wells and horizontal wells ). It is the dispensable solids control equipment. Decanter centrifuge includes spiral subsidence type, sieve water type, hydraulic turbine type and so on. In the oil and gas drilling industry, the most commonly used is Horizontal spiral sedimentation type centrifuges. And this horizontal decanter centrifuge also has low speed, middle speed and high speed.

Hebei JinXin Machinery Co.,Ltd's Decanter Centrifuge Parameter as below show:

Model	JXLW220	JXLW220-VFD	JXLW360	JXLW360-VFD	JXLW450
Drum diameter (mm)	220	220	360	360	450
Drum length (mm)	670	670	1217	1217	1105
Max. treating capacity(m3/h)	2	2	45	45	57
Effective capacity (m3/h)	0.5-2	0.5-2	30	30	40
Drum max. speed	4800	4800	3900	3900	1800
Drum rated speed	4800	0-4800	3200	0-3200	1800
G-force	2840	2840	3063	3063	1800
Separation point	2-5	2-5	2-5	2-5	5-7
Differential speed ratio	95:1	57:1	57:1	57:1	57:1
Differential torque	1400	1400	3500	3500	3500
Main motor power(KW)	7.5	7.5	37	37	45
Back motor power(KW)	3	3	11	11	N/A
Weight (kg)	750	750	3300	3300	2634
Dimension(mm)	2130x790x1115	2130x790x1115	3414x1516x1430	3414x1516x1430	3274x1090x1653

Decanter Centrifuge's Structure: Main motor, Back drive motor,Hydraulic couplings, Drum bowl, Differential mechanism and Feeding pump etc.

The main motor drives the roller by driving the pulley on the roller through the belt wheel on the hydraulic coupling. The drum bowl is supported on two bearings. In the drum bowl, there is a screw propeller, the screw propeller is supported on the middle of shaft of drum bowl.  The differential is installed on the bigger side of drum bowl, it is a planetary gear reduction mechanism structure. The output shaft of the differential connects with the propeller and then make the propeller spiral. The input shaft at the right end of the differential is equipped with a pulley, which is driven by the auxiliary pulley to provide the differential input speed.  

The Decanter Centrifuge's Drum bowl is installed in a stainless steel box. The stainless box has two cabins, the left cabin collects the discharged fluid of centrifuge, and the right cabin collect the discharged solids from centrifuges.

Email: alisa@jxsolidscontrol.com

Website: www.jxsolidscontrol.com