Sulfur Foam Separation Centrifuge

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Horizontal Spiral Centrifuge for Sulfur Foam solid liquid separation

Sulfur Recovery Filtration Machine

Sulfur is a major contaminant in the oil and gas industry that exists in various forms and requires separation from both water and process streams. In recent years the removal of sulfur species has received increasing attention because of safety concerns, the need to reduce emissions of sulfur oxides (SOx), and the fact that sulfur harms the combustion properties of fuels.
In fact, contamination control through separation is a key step in helping to maintain process control. Separation processes are often the first — line of defense for avoiding many process variations and out-of-control episodes, and separation devices play critical roles in minimizing downtime and increasing systems reliability.

- JB/T502-2015 Chinese national standard of decanter centrifuge
- 2006/42/EC Machinery Directive
- 2014/35/EU Low voltage Directive
- 2014/30/EU Electromagnetic compatibility Directive
- Quality management system of ISO9001-2000

1. Bowl: The bowl is the main body of the centrifuge and is typically cylindrical in shape. It houses the slurry or liquid mixture that needs to be separated.

2. Screw-conveyor: The scroll is a helical flight inside the bowl that rotates at a slightly different speed than the itself. It helps to convey the separated solids towards the discharge ports.

3. Drive System: The drive system consists of a motor and a gearbox that provides the rotational power to the bowl and the scroll. It ensures smooth and controlled operation of the centrifuge.

4. Differential Speed Controller: This component allows for adjusting the differential speed between the bowl and the scroll. This speed is crucial for effective separation of the solids from the liquid phase.

5. Feed Pipe and Distributor: The feed pipe introduces the slurry or liquid mixture into the centrifuge, while the distributor evenly distributes it along the length of the bowl to ensure efficient separation.

6. Solids Discharge Ports: These ports are at the narrow end of the bowl and allow separated solids to be discharged from the centrifuge.

7. Liquid Discharge Ports: These ports are positioned at the wider end of the bowl and facilitate the removal of the clarified liquid phase.

8. Solids Collection System: This system collects and discharges separated solids from the solids discharge ports. It may include components such as conveyors or chutes.

9. Control: The control panel is an interface that allows operators to monitor and control various parameters of the decanter centrifuge, such as speed, feed rate, and separation efficiency.

The decanter centrifuge works based on the principles of sedimentation and centrifugal force. The mixed material is introduced into the centrifuge, where solids settle against the outer wall of the rotating drum, while the liquid flows towards the center. The differential speed the scroll drives the settled solids towards one end, while the from the other end. This continuous process efficiently separates solid and liquid components, allowing for further processing or disposal of each phase independently.

1. Effectively ease resonance during rotating of bi-rotor

When centrifuge works, there is no obvious first-order and two-order resonance regions within designed speed range,meanwhile whole vibration intensity of bearing seat is definited within 2mm/s-4mm/s.All of this eliminates extra fatigue damage to components and assembly units from high frequency vibration during operation and sudden vibration when shut down.

2. Adopt large length-diameter ratio technology

Large length-diameter ratio can increase the settling area of the material, prolong the stay time of the material in the centrifuge, and improve the removal rate of solid matter.

3. Equipped with a foam crushing device

Centrifuges are equipped with a foam crushing device and a floatable particle catcher to counter the negative impact of foam on solid recovery. By crushing foam bubbles, the attached solid particles settle down and are pushed out from the sludge phase, resulting in an improved recovery rate of the liquid phase.

4. Unique vortex discharge part design

The discharge part of the screw discharger adopts the eddy current structure, which conforms to the "double S" structure design principle of liquid mechanics, can accelerate the material to enter the drum quickly, shorten the contact distance between the material and the liquid pool, reduce the disturbance of the feed to the separated solid phase, improve the processing capacity, and avoid the blockage in the screw and the feed pipe lock phenomenon.

Surfacing tungsten carbide at the outlet of the material increases the service life of the helix.

5. High-performance stainless steel

In view of the characteristics of small particles of foam sulfur material and high content of sulfuric acid ion, in order to ensure the operation stability and service life of the centrifuge, SAF2205 with high strength and better corrosion resistance is used for the drum parts, and 316L material is used for the spiral parts.

6. Advanced dual-motor dual-frequency common DC & constant torque control technology

The centrifuge's motors are controlled by a high-performance vector frequency converter. The secondary motors act as generators due to differential velocity. With the common DC bus technology, the secondary frequency converter converts the electric energy from the secondary motor to the main motor, achieving energy-saving and reduced consumption. The double motor double frequency control technology allows for seamless adjustment of centrif differential speed, with benefits such as fast reaction speed, precise torque detection, stable torque control, and low failure rate.

1. Speed

The higher the rotational speed, the greater the centrifugal force the material is subjected to, the faster the sedimentation rate of solid particles, and the better the separation effect.

2. Liquid Layer Depth

Increasing the depth of liquid layer will decrease the solid content in liquid phase and increase the water content in solid phase. Reducing the depth of the liquid layer is the opposite.

3. Differential Speed Between Drum and Screw

The difference speed determines the discharge speed of the screw push, in the case of constant speed, the difference speed increases, the path of the clear liquid before being discharged from the centrifuge will increase, which can reduce the solid content of the liquid phase, but because the spiral discharge speed will speed up and reduce the residence time of the solid phase part in the centrifuge, thus affecting the dryness of the separated sulfur paste.

4. Processing Capacity

The adjustment of the processing capacity is a comprehensive process, which should be determined according to the processing effect and the host load.

Compared with the plate and frame filter press, decanter centrifuges have the following advantages:

(1) The plate and frame filter press occupies a large area, the installation and debugging are complex, and the maintenance cost is high, while the decanter centrifuge occupies a small area, the installation and debugging are simple, and the on-site maintenance is convenient.

(2) The plate and frame filter press works intermittently, requiring regular slag discharge and cleaning of the filter cloth, and the work efficiency is low; The horizontal centrifuge in the work of feeding, separation, unloading and other processes are continuous and automatic in a closed environment, high work efficiency, good site environment.

(3) The moisture content of the sulfur paste filtered by the plate and frame filter press is about 45%, and the solid content of the liquid phase is 0.5% to 0.8%; And decanter centrifuge separation The moisture content of the sulfur paste is less than 40%, and the solid content of the separated liquid phase is less than 0.02% due to the use of the special structure of the floater catcher

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