Rapeseed Oil Extraction Machine
Rapeseed generally contains 3.9%-5.2% nitrogen, 24.6%-32.4% protein, 5.7%-9.6% cellulose, 4.1%-5.3% ash, and 37.5%-46.3% oil. Rapeseed oil is the second largest oil variety in China.
Common rapeseed contains a certain amount of erucic acid, which will affect the quality of rapeseed and rapeseed oil. Rapeseed also contains a certain amount of sinapine, tannin and other chemical substances, all of which are toxic to a certain extent, so the rapeseed cake needs to be detoxified before it can be used as feed.
"Double-low rapeseed", low erucic acid, low glucosinolates, the national standard is that the content of erucic acid in oil products is less than 3%, and the content of glucosinolates in rapeseed should be less than 30 micromol/g. Since the glucosinolate content of double-low rapeseed is less than 30 micromoles per gram of vegetable cake, it is perfect for pigs, chickens, fish and other compound feeds. The protein content of double-low rapeseed meal can be as high as 40%
Currently, canola is the main source of rapeseed oil.
The basic process of rapeseed oil extraction machine;
The working order of the rapeseed oil extraction machine is to dry and clean the rapeseed first. During the process of harvesting or drying rapeseed, impurities such as sand, soil, rape stems and leaves may be mixed in. If these impurities are not treated effectively, not only will the quality of the cake be poor, but also the quality of the oil will be reduced. . In addition, if the oil contains sand, mechanical impurities, etc., it will also cause damage to the oil extraction equipment. Therefore, in order to ensure the smooth progress of production, certain impurity cleaning must be carried out before entering the press.
Light Miscellaneous Large Miscellaneous
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Oil → winnowing → screening → magnetic separation → side-by-side mud cleaning → billet rolling → flakes
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Heavy miscellaneous Iron miscellaneous Small miscellaneous
(1) Wind separation: According to the difference in specific gravity and aerodynamic properties between oil seeds and impurities, the impurities in the oil are separated by wind force. Wind separation can be used to remove light impurities and dust in oil, and can also be used to remove heavy impurities such as metals and stones.
Features: air selection can be realized by adjusting the wind speed according to the physical properties of the oil, and can remove very light impurities similar to dust. By adjusting the wind speed, a better separation effect can be achieved, and air selection has screening and other cleaning methods that cannot be replaced role.
(2) Screening; Screening is to use the difference in particle size between the oil and impurities, with the help of the relative movement between the oil containing impurities and the sieve surface, and remove the impurities larger or smaller than the oil through the sieve holes.
Features: The large and small impurities in the oil can be removed through the relative movement of the sieve and different selections of the sieve surface. Screening is a traditional cleaning process. This method is simple and easy to achieve a good separation effect.
(3) Magnetic separation; Magnetic separation is a method of using magnets to remove metal impurities in oil. Although the content of metal impurities in oilseeds is not high, they are very harmful and can easily cause damage to equipment, especially some high-speed operating equipment, and may even cause serious equipment accidents and safety accidents, so they must be removed.
(4) Cleaning of side-by-side mud; the shape and size of side-by-side mud are similar or equal to that of oilseed, and the specific gravity is not significantly different from that of oilseed, which is called "side-by-side mud". Rapeseed, sunflower seeds, soybeans, and sesame contain a lot of side-by-side mud. The cleaning of the side-by-side mud is to use the different mechanical properties of the mud and oilseeds. First, grind or hit the oil seeds containing the side-by-side mud to crush the side-by-side mud, that is, grind the mud, and then screen or winnow the dust to remove it.
The characteristics of the rapeseed oil extraction machine: it can remove impurities that are difficult to remove. After beating and grinding, the side-by-side mud can be easily removed. The fan is used to remove dust and the equipment is used reasonably.
Rolling of rapeseed oil extraction machine; the purpose of rolling is to destroy the cell tissue of oil, increase the surface area of oil, shorten the distance of oil outflow, which is beneficial to the extraction of oil and improve the effect of steaming and frying.
During rolling, the external mechanical force can be used to destroy the cell tissue of the oil plant and the cell wall of some cells. Rolling makes the oil material change from granular to flake, reduces its thickness, increases the surface area, increases the contact surface between the billet and the solvent when the oil is extracted by solvent leaching, and shortens the diffusion distance of the oil, which is beneficial to increase the speed of leaching and depth.
Features: The requirements for the green sheet are thin and uniform, less powdery, and no oil.
Steaming and frying of rapeseed oil extraction machine; Steaming and frying is one of the effective methods to improve the oil yield of rapeseed, and it is also an important process in oil production. Raw rapeseeds are heat-treated and sent to oil pressing equipment for pressing, which is called hot pressing, which can improve the oil yield. The quality of steaming and frying can have a certain impact on the oil yield of rapeseed and other oils to a large extent.
The press of the rapeseed oil extraction machine extracts the oil.
Because the shape of rapeseed is different from other oils. Therefore, in the process of pressing, the requirements for pressing snails and pressing chambers are also different from those of other oil plants. During the production, it is required that the pressing snail should have a zigzag curve and a conical surface, which is conducive to the full destruction of the rapeseed molecules and the maximum oil output.
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Extraction section of rapeseed oil extraction machine
Rapeseed oil extraction is the process of extracting oil from rapeseed cake by using the principle of compatibility between solvent and oil. Rapeseed oil extraction equipment mainly includes rapeseed oil extraction system, wet powder desolventization system, mixed oil separation system and solvent recovery system. The residual oil rate of the rapeseed cake after leaching is less than 1%, which reduces the loss of fat and increases the profit and income of the producer. This is why most of the customers choose the extraction method to produce rapeseed oil.
The machine components in the extraction section of the rapeseed oil extraction machine include: extractor, desolventizer, meal collector, long tube evaporator, disc stripper, condenser, comprehensive container, cooking tank, tail gas absorption tower, etc.
Main features: The equipment adopts negative pressure evaporation process, which has low residual oil, less solvent consumption, good quality and light color of crude oil leached.
The process of the rapeseed oil extraction machine is as follows: the rapeseed press cake in the pre-pressing workshop is transported to the leaching workshop, and enters the extractor through the 1# buried scraper conveyor and the sealing auger. The reduced mixed oil is then sprayed with fresh solvent to reduce the oil content in the material to less than 1%. After the extraction section is completed, the wet meal is unloaded from the extractor, and enters the steamer by 2# buried scraper conveyor and sealing auger. Dry the solvent in the meal with off-line steam, and spray it into direct steam to remove the solvent. After the meal is dried, it is transported to the meal storage for packaging. The mixed oil obtained by solvent leaching oil and fat is filtered, precipitated by mechanical impurities, evaporated, stripped and other processes to remove the solvent to obtain leached crude oil, and the crude oil is sent to the refining workshop for further processing, and the solvent is cooled and recycled for reuse after water separation.
Negative pressure evaporation technology can be used for the separation of mixed oil, using the secondary vapor of the evaporation machine as the heat source, and the first steaming, second steaming, and stripping are all evaporated and separated in a vacuum state, which reduces the evaporation temperature, improves the quality of crude oil, and saves steam consumption.
The solvent vapors of primary steaming, secondary steaming, stripping, and leaching are respectively recovered through corresponding condensers, and the condensate is collected in the liquid collection tank, and after entering the comprehensive container for water separation, the solvent is then pumped into the leaching device to enter the next cycle and separated out. After the water is cooked in the cooking tank, the waste water is discharged. The free gas of each condenser enters the balance tank, and then enters the final condenser, and the tail gas is discharged after recovering the solvent. Exhaust gas recovery can be done by water absorption, freezing recovery, mineral oil absorption, etc.
