A hydrocyclone is most often used to separate "heavies" from a liquid mixture
originating at a centrifugal pump or some other continuous source of pressurized
liquid. A hydrocyclone is most likely to be the right choice for processes where
"lights" are the greater part of the mixture and where the "heavies" settle
fairly easily.
In oilfield drilling mud solids control
system, hydrocyclone is usually installed on mud desilter,
desander and mud
cleaner. It is the most important solids
control component for them.
For the work principle of hydrocyclones, it works like this. First, the
drilling fluids is sucked up to 0.25Mpa ~ 0.4Mpa by sand pump, and enters into
the cones through the side inlet which is normally only 2-1/2″ in diameter. The
fluids then flows spirally inside of the cone. Effected by the centrifugal
force, the heavy solids in the fluids would be thrown towards the inner wall of
the cones, go down to the bottom, and discharge through the sand discharge port,
while the light fluids would go up and discharge through the upper outlet. The
diameter of the bottom discharge port is adjustable, and with a cover of
hydrocyclone.
2015年11月3日星期二
The main types of decanter centrifuge
The main types of decanter centrifuge are the vertical orientation,
horizontal orientation and Conveyor/Scroll.
In vertical centrifuge,also called vertical cuttings dryer in DWM control field, the rotating assembly is mounted vertically with its weight supported by a single bearing at the bottom or suspended from the top. The gearbox and bowl are suspended from the drive head, which is connected to the frame. The vertical decanter allows for high temperature and/or high-pressure operation due to the orientation and the rotational seals provided at one end. However, this makes the device more expensive than the horizontal decanter centrifuge, which is non-pressurised and open. The advantage of the vertical machine over the horizontal machine is that the noise emitted during production is much lower due to less vibration.
In horizontal decanter centrifuge, the rotating assembly is mounted horizontally with bearings on each end to a rigid frame, which provides a good sealing surface for high-pressure applications. The feed enters through one end of the bearings, while the gearbox is attached to the other end and is operated below critical speed. Capacities range up to 40,000 pounds (18,000 kg) of solids per hour with liquid feed rates of up to 300 US gallons (1.1 m3) per minute. The horizontal machine is arranged in a way that slurry can be introduced at the centre of a rotating horizontal cylindrical bowl. The scroll discharge screw forces the solids to one end of the bowl as it is collected on the walls. This orientation is the most common design implemented in industry.
In conveyor decanter centrifuges the conveyer or scroll fits inside a rotating bowl and carries the solids settled against the wall, pushing them across a beach towards the underflow where the solids discharge. The conveyor allows for an increase in separation efficiency and feed capacity.
In vertical centrifuge,also called vertical cuttings dryer in DWM control field, the rotating assembly is mounted vertically with its weight supported by a single bearing at the bottom or suspended from the top. The gearbox and bowl are suspended from the drive head, which is connected to the frame. The vertical decanter allows for high temperature and/or high-pressure operation due to the orientation and the rotational seals provided at one end. However, this makes the device more expensive than the horizontal decanter centrifuge, which is non-pressurised and open. The advantage of the vertical machine over the horizontal machine is that the noise emitted during production is much lower due to less vibration.
In horizontal decanter centrifuge, the rotating assembly is mounted horizontally with bearings on each end to a rigid frame, which provides a good sealing surface for high-pressure applications. The feed enters through one end of the bearings, while the gearbox is attached to the other end and is operated below critical speed. Capacities range up to 40,000 pounds (18,000 kg) of solids per hour with liquid feed rates of up to 300 US gallons (1.1 m3) per minute. The horizontal machine is arranged in a way that slurry can be introduced at the centre of a rotating horizontal cylindrical bowl. The scroll discharge screw forces the solids to one end of the bowl as it is collected on the walls. This orientation is the most common design implemented in industry.
In conveyor decanter centrifuges the conveyer or scroll fits inside a rotating bowl and carries the solids settled against the wall, pushing them across a beach towards the underflow where the solids discharge. The conveyor allows for an increase in separation efficiency and feed capacity.
Decanter centrifuge functions for various industries
Decanter
centrifuge is used to separate (dewater) solid materials from liquids in solids control
system when they are mixed together in mud. Besides, decanter centrifuge is
applied in many industries such as:
1. Solids separation (oil well drilling, refining, de-watering)
2. Industrial and biological wastewater treatment
3. Food processing (olive oil, wine, fruit juice)
4. Fish processing (fish meal, fish oil)
5. Chemical slurry
Decanter centrifuge is driven by two motors. The main motor drives the drum and the outer casing of differential through belts while the auxiliary motor, after the differential shifting speed, drives the spiral propeller. This will make the drum and the spiral propeller rotate in the same direction with a certain differential speed. There are several different types of decanter centrifuges, such as: Vertical, horizontal, or scroll (conveyor).
1. Solids separation (oil well drilling, refining, de-watering)
2. Industrial and biological wastewater treatment
3. Food processing (olive oil, wine, fruit juice)
4. Fish processing (fish meal, fish oil)
5. Chemical slurry
Decanter centrifuge is driven by two motors. The main motor drives the drum and the outer casing of differential through belts while the auxiliary motor, after the differential shifting speed, drives the spiral propeller. This will make the drum and the spiral propeller rotate in the same direction with a certain differential speed. There are several different types of decanter centrifuges, such as: Vertical, horizontal, or scroll (conveyor).
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