Centrifugal extraction machine as oil/water separation equipment in industry application
Oil-water separation is mainly according to the density difference of water and oil or chemical properties, by using the theory of gravity settling or other physical and chemical reaction to remove impurities or complete separation of oil and water.
the oil-water separation methods mainly include gravity separation, centrifugal separation, separation, adsorption separation, air flotation separation, etc.
gravity separation due to the relative density of oil, gas, water, composition of oil-water mixture under certain pressure and temperature, when the system is in balance can form a certain percentage of the oil, gas and water phase.
When relatively light components in a laminar flow state, heavy component droplet according to stokes' theorem of motion law of settlement, settlement of gravity separation equipment that is based on the basic principle of this design.
The stokes' theorem shows that sedimentation rate is directly proportional to the square of the radius of water and oil, is proportional to the density difference of water and oil, and is inversely proportional to the viscosity of oil.
By increasing water density, expand the oil/water density difference, reduce the oil viscosity can increase the speed of sedimentation separation, thus improve the separation efficiency.
electrical evaporation as a means of oil-water treatment eventually, is widely used in oil fields and refineries, its principle is emulsion under high voltage ac or dc field, due to the electric field on the function of water droplets, weaken the interface of emulsion film strength, promote water droplets collision, merge, eventually forming a size larger droplets, separated from crude oil.
Because of evaporation of dealing with the water content is higher crude oil emulsion, will not necessary to establish a electrode electric breakdown field strength, therefore, to take off the method cannot be used independently, can only as other processing method after the order process.
coarse graining of emulsified water evaporation with the condition of oil and water affinity of solid material is different, solid material made from a variety of commonly used hydrophilic abhorred oil evaporation device.
Used for oil-water separation of solid material should possess good wettability.
Suitable for the requirements of the material are: ceramics, wood, fiber material, walnut shell etc.
Ceramsite evaporator in dagang oilfield, for example, using ceramsite as packing, when the oil-water mixture through the ceramsite layer, forced to keep changing the velocity and direction, increased the water droplets collision coalescence rate, the settlement of small droplet coalescence quickly.
Air flotation separation in
air flotation depend on water to form tiny air bubbles, flocculant carrying grain to rise to the surface to make a method of water purification.
Conditions are attached to the oil gas bubbles can form oil and gas particles.
Due to the emergence of bubble and particle density difference between water increased, and the particle diameter is larger than crude oil droplets, so the density in grain density instead of oil can make up speed has improved significantly.
When a bubble,
Or more bubbles)
Attached to a drip can increase the vertical rising speed, which can be removed more than 50 microns in diameter droplets.
using the oil/water density is different, make the high-speed rotation of the oil-water mixture produces different centrifugal force, so that the oil and water separate.
Because can achieve very high speed centrifugal equipment, produce up to hundreds of acceleration of gravity centrifugal force, so the centrifugal equipment can more thoroughly the oil moisture left, and only a short residence time and smaller equipment volume.
The moving parts of centrifugal equipment, maintenance is more difficult, so only applied to the analysis of laboratory equipment and the need to reduce the area of place.
working using the centrifugal separation principle of a hydrocyclone is our main equipment, it is used to serve as the continuous phase as the dispersed phase liquid and solid particles, liquid droplets, or bubble physical separation equipment.
The greater the density difference between dispersed phase and continuous phase, two phase the easier it is to separate.
Like in the case of gravitational field, the density difference between two phase under certain conditions, the greater the grain diameter of dispersed phase, reach a balance between two phase in the gravitational field reverse operation of the speed difference, the greater the so the easier it is to separate.
centrifugal extraction machine as the characteristics of the oil/water separation equipment (1) to adapt to the strong performance -
Compared with the traditional van and extraction tower equipment, under the effect of centrifugal force, the remaining time is short, split phase quickly, to adapt to the wide range of flow ratio, and processing power;
By changing the weir plate and frequency control of motor speed can meet the different density and viscosity of liquid materials;
2 material stock of small -
Two-phase material stock in the equipment is small, short contact time, more suitable for processing because of long time volatile activity and variability of materials such as antibiotics, etc. , of course, individual system needs two phase together contact time long also can operate separately.
(3) high extraction efficiency -
Phase equilibrium set up fast, easy to implement series single stage or multistage counter-current or wrong washing and extraction, high mass transfer efficiency and grade efficiency approaching 100%, stop not to undermine the established after concentration distribution at different levels, can at any time at all levels of sampling, facilitate testing.
(4) to take up the space is little,
Motor direct drive, no transmission attachments, compact structure, save area and operating space, less auxiliary equipment.