A rapeseed oil pressing system

Abstract

This utility model discloses a rapeseed oil pressing system. The system comprises a raw material pretreatment production line, a pressing and oil extraction production line, and a crude oil refining production line. This application describes a crude oil refining rapeseed pressing system with tightly connected pressing processes, overall controllable pressing processes, and strong synergy, which helps to improve the oil extraction rate. The system adopts a combined "pre-pressing + solvent extraction" process: the screw pre-press first extracts 80%-85% of the oil, and the pre-pressed cake (oil content 12%-18%) is crushed by the cake crusher and sent to the solvent extractor. The residual oil is extracted by solvent extraction, which greatly improves the total oil yield. At the same time, the solvent-extracted crude oil and the pre-pressed crude oil are collected together in the crude oil storage tank to achieve centralized oil processing and reduce losses caused by decentralized collection.

Description

Technical Field

[0001] This utility model relates to the field of rapeseed oil pressing, specifically to a crude oil refining rapeseed pressing system. Background Technology

[0002] As one of my country's main edible vegetable oils, the sophistication of rapeseed oil production technology directly affects oil quality, oil yield, and production efficiency. Currently, rapeseed pressing and processing has formed a complete system from raw material pretreatment to finished product refining, but there are still many issues that need to be optimized in actual production.

[0003] In traditional rapeseed processing, insufficient precision in raw material pretreatment can lead to increased wear and tear on subsequent equipment and affect oil extraction efficiency. For example, incomplete cleaning and impurity removal can introduce impurities such as soil and metal, which may damage core components of equipment such as crushers and rolling mills, increase the impurity content in crude oil, and make subsequent refining more difficult. Uneven crushing particle size and improper control of softening moisture and temperature can result in large deviations in the thickness of the rolled bisque, failing to fully destroy the oilseed cell structure and directly reducing the oil yield during the pressing stage.

[0004] In the oil pressing process, the pre-pressed cake typically has a high oil content, which would lead to a waste of oil resources if not further processed. Although some existing processes use leaching to recover residual oil, the integration of leaching equipment with the pretreatment and pre-pressing stages is not well-designed. This can easily result in problems such as unsuitable pre-pressed cake particle size and insufficient contact between the solvent and the cake, leading to low leaching efficiency and increased energy consumption for desolventizing the mixed oil.

[0005] Crude oil refining is a crucial step in ensuring the quality of rapeseed oil. Traditional refining processes often suffer from poor coordination between different equipment units. For example, insufficient hydration during degumming can lead to excessive residues of phospholipids and other gums, affecting subsequent deacidification. Insufficient uniformity of the mixing of alkali and oil during deacidification can result in incomplete neutralization of free fatty acids, leading to excessive acid value in the oil. Improper control of the amount of adsorbent added and the temperature during the decolorization process can not only reduce the decolorization effect but may also introduce new impurities. Inadequate control of crystallization temperature and time during dewaxing can lead to incomplete wax separation, affecting the clarity and storage stability of the finished oil.

[0006] Furthermore, existing rapeseed pressing systems have low overall integration and inefficient material transfer between production lines, which can easily lead to production interruptions or material accumulation, reducing continuous production capacity and overall production efficiency. Therefore, developing a rapeseed pressing system with tight process connections, controllable processes, and strong collaborative capabilities is of great significance for improving oil extraction rate, ensuring product quality, and reducing energy consumption. Utility Model Content

[0007] Therefore, in order to overcome the above-mentioned shortcomings, this utility model provides a crude oil refining rapeseed pressing system with tight connection of pressing process, overall controllability of pressing process and strong synergy, which helps to improve the oil extraction rate.

[0008] This utility model is implemented by constructing a rapeseed oil pressing system, characterized in that the system comprises a raw material pretreatment production line, a pressing and oil extraction production line, and a crude oil refining production line. The raw material pretreatment production line includes screening equipment, crusher, softening pot, rolling mill and steaming and frying pot; the oil pressing production line includes screw prepress, cake crusher, extractor and crude oil storage tank; the crude oil refining production line includes degumming unit, deacidification unit, decolorization unit and dewaxing unit. The output of the screening equipment is connected to the crusher via a transmission mechanism. The output of the crusher is connected to the softening pot via a transmission mechanism. The output of the softening pot is connected to the rolling mill via a transmission mechanism. The output of the rolling mill is connected to the steaming and frying pot via a transmission mechanism. The steaming and frying pot is connected to the screw prepresser via a transmission pipeline. The prepressed cake outlet of the screw prepresser is connected to the cake crusher. The cake crusher is connected to the extractor. The prepressed cake is crushed and sent to the extractor. The prepressed crude oil outlet of the cake crusher is connected to the crude oil storage tank via a pipeline. The crude oil outlet of the extractor is connected to the crude oil storage tank via a pipeline. The wet meal outlet of the extractor is connected to the drying device via a transmission device. After being dried by the drying device, it becomes rapeseed meal. The degumming unit includes a hydration tank, a mixer A, and a centrifuge A. The mixer A is connected to both the crude oil storage tank and the hydration tank. The crude oil storage tank feeds crude oil into the mixer A, and the centrifuge A is connected in sequence. The hydration tank is used to add hot water or phosphoric acid solution to the mixer A. The mixer A is used to mix the crude oil with the additive solution. The output end of the mixer A is connected to the centrifuge A, which is used to separate out the formed gum impurities. The deacidification unit includes an alkali refining tank, a mixer B, and a centrifuge B. The mixer B is connected to the outlet end of the centrifuge A. The alkali refining tank is used to add alkali solution to the mixer B and mix it with the degummed crude oil. The mixer B ensures that the alkali solution and oil are fully mixed. The outlet end of the mixer B is connected to the centrifuge B, which is used to separate soap residue from oil. The decolorization unit includes a decolorization tank and a filter A. Adsorbent is added to the decolorization tank and mixed with the deacidified oil. The output end of the decolorization tank is connected to the filter A. The filter A is used to remove the adsorbent. After filtration, a light-colored decolorized oil is obtained. The dewaxing unit includes a crystallization tank and a filter B. The crystallization tank is connected to the filter A. The crystallization tank is used to cool the decolorized oil and cause the wax to crystallize and precipitate. The output end of the crystallization tank is connected to the filter B. The filter B is used to separate the wax crystals to obtain clear refined rapeseed oil.

[0009] According to the rapeseed oil pressing system described in this application, the screening equipment is a vibrating screen or a magnetic separator to remove soil, stones, weeds, metal impurities, etc. from the rapeseed, so as to avoid damaging subsequent equipment or affecting the quality of the oil.

[0010] According to the rapeseed oil pressing system described in this application, the system is characterized in that: a crusher is used to crush the cleaned rapeseed into 4-8 cloves of particles, thereby increasing the contact area between the oilseed and the rollers and facilitating subsequent rolling. The crushed rapeseed is conditioned in the softening pot (by adding water or steam) to control the moisture content at 10%-12% and raise the temperature to 60-70℃, which softens the texture of the oilseed, enhances its plasticity, and facilitates the forming of the rolled blank. The softened rapeseed is rolled into thin sheets (sheets) with a thickness of 0.3-0.5 mm by the rolling mill, which destroys the cell structure of the oilseed, shortens the oil outflow path, and increases the oil yield. The oilseed cakes are heated and their moisture content adjusted in the steaming and frying pan, which further breaks down the oilseed cells, while reducing the viscosity and increasing the fluidity of the oil. During the process, the moisture content is controlled at 1%-3%, and the temperature is raised to 100-110℃, so that the oilseed cakes reach a state of being "cooked but not burnt, tender but not crumbly," preparing them for pressing.

[0011] According to the rapeseed oil pressing system described in this application, the system is characterized in that a screw prepresser is used to pre-press the steamed and roasted rapeseed cake to extract 80%-85% of the oil, thereby obtaining pre-pressed crude oil and pre-pressed cake (oil content of about 12%-18%).

[0012] This utility model has the following advantages: First, it improves the precision of raw material pretreatment and ensures the stability of subsequent processes: This system efficiently removes impurities from raw materials through screening equipment (vibrating screen or magnetic separator), avoiding wear and tear on subsequent equipment and reducing the impurity content of crude oil; the crusher breaks rapeseed into uniform particles of 4-8 pieces, and the softening pot precisely controls the moisture (10%-12%) and temperature (60-70℃), while the rolling mill rolls uniform blanks of 0.3-0.5mm, which can fully destroy the cell structure of oilseeds, providing a good foundation for subsequent pressing and leaching, and effectively improving the oil extraction efficiency.

[0013] Second, improve oil extraction rate and reduce resource waste: The system adopts a combined "pre-pressing + leaching" process: the screw pre-press first extracts 80%-85% of the oil, and the pre-pressed cake (oil content 12%-18%) is crushed by the cake crusher and sent to the leaching unit. The residual oil is extracted by solvent, which greatly improves the total oil yield. At the same time, the leached crude oil and the pre-pressed crude oil are collected into the crude oil storage tank to realize centralized processing of oil and reduce the loss caused by decentralized collection.

[0014] Third, optimize crude oil refining effect and ensure finished product quality: the various units of the refining production line work together: the degumming unit uses a combination of hydration tank, mixer and centrifuge to ensure that the gum is fully precipitated and separated; the deacidification unit uses alkali refining tank and mixer to achieve uniform mixing of alkali solution and oil, and improve the neutralization efficiency of free fatty acids; the decolorization unit uses a combination of decolorization tank and filter to effectively remove pigments and impurities; the dewaxing unit uses crystallization tank and filter to separate wax, and finally obtain clear and stable refined rapeseed oil with better indicators.

[0015] Fourth, enhance system integration and improve production efficiency: The various production lines in the system are closely connected through the transmission mechanism, forming a continuous production process from raw material pretreatment to finished product refining, reducing material accumulation and production interruption; each piece of equipment has a clear function and controllable parameters (such as steaming and frying pot temperature of 100-110℃ and moisture content of 1%-3%), ensuring process stability, improving overall production efficiency, and reducing manual intervention costs.

[0016] Fifth, it achieves efficient utilization of by-products and improves economic benefits: the wet meal after leaching is processed by a drying device into rapeseed meal, which can be directly used as feed raw material, realizing comprehensive utilization of resources; the entire process consumes more rational resources such as solvents and heat energy, while increasing the income of main products and increasing the added value of by-products, thereby improving the economic benefits of enterprises. Attached Figure Description

[0017] Figure 1 This is a structural block diagram of the pressing system of this application; Figure 2 This is a structural block diagram of the crude oil refining production line in this application. Detailed Implementation

[0018] The following will be combined with the appendix Figures 1-2 This utility model will be described in detail, and the technical solutions in the embodiments of this utility model will be clearly and completely described. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0019] This utility model provides a crude oil refining rapeseed pressing system, such as... Figures 1-2 As shown, it can be implemented in the following manner; the system consists of a raw material pretreatment production line, an oil pressing production line, and a crude oil refining production line; The raw material pretreatment production line includes screening equipment 1, crusher 2, softening pot 3, rolling mill 4, and steaming and frying pot 5; the pressing and oil extraction production line includes screw prepress 6, cake crusher 7, extractor 8, and crude oil storage tank 9; the crude oil refining production line includes degumming unit, deacidification unit, decolorization unit, and dewaxing unit. The output end of the screening device 1 is connected to the crusher 2 through a transmission mechanism. The output end of the crusher 2 is connected to the softening pot 3 through a transmission mechanism. The output end of the softening pot 3 is connected to the rolling mill 4 through a transmission mechanism. The output end of the rolling mill 4 is connected to the steaming and frying pot 5 through a transmission mechanism. The steaming and frying pot 5 is connected to the screw pre-press 6 through a transmission pipeline. The pre-pressed cake outlet of the screw pre-press 6 is connected to the cake crusher 7. The cake crusher 7 is connected to the extractor 8. The pre-pressed cake is crushed and sent to the extractor 8. The pre-pressed crude oil outlet of the cake crusher 7 is connected to the crude oil storage tank 9 through a pipeline. The crude oil outlet of the extractor 8 is connected to the crude oil storage tank 9 through a pipeline. The wet meal outlet of the extractor 8 is connected to the drying device 10 through a transmission device. After being dried by the drying device 10, it becomes rapeseed meal (which can be used as feed raw material).

[0020] In practice, the degumming unit includes a hydration tank 11, a mixer A12, and a centrifuge A13. The mixer A2 is connected to the crude oil storage tank 9 and the hydration tank 11 respectively. The crude oil storage tank 9 feeds crude oil into the mixer A12, and the centrifuge A13 is connected in sequence. The hydration tank 11 is used to add hot water or phosphoric acid solution to the mixer A12. The mixer A12 is used to mix the crude oil and the added solution. The output end of the mixer A12 is connected to the centrifuge A13, and the centrifuge A13 is used to separate the formed gum impurities.

[0021] In practice, the deacidification unit includes an alkali refining tank 14, a mixer B15, and a centrifuge B16. The mixer B15 is connected to the outlet of the centrifuge A13. The alkali refining tank 14 is used to add alkali solution to the mixer B15 and mix it with the degummed crude oil. The mixer B15 ensures that the alkali solution and oil are fully mixed. The outlet of the mixer B15 is connected to the centrifuge B16, which is used to separate soap residue from oil.

[0022] In practice, the decolorization unit includes a decolorization tank 17 and a filter A18. An adsorbent is added to the decolorization tank 17 and mixed with the deacidified oil. The output end of the decolorization tank 17 is connected to the filter A18, which is used to remove the adsorbent. After filtration, a light-colored decolorized oil is obtained.

[0023] In practice, the dewaxing unit includes a crystallizer 19 and a filter B20. The crystallizer 19 is connected to the filter A18. The crystallizer 19 is used to cool the decolorized oil and cause the wax to crystallize and precipitate. The output end of the crystallizer 19 is connected to the filter B20. The filter B20 is used to separate the wax crystals to obtain clear refined rapeseed oil.

[0024] In the implementation of this application, the screening equipment 1 is a vibrating screen or magnetic separator to remove soil, stones, weeds, metal impurities, etc. from the rapeseed, so as to avoid damaging subsequent equipment or affecting the quality of the oil.

[0025] Crusher 2 is used to crush the cleaned rapeseed into 4-8 pieces, increasing the contact area between the oilseed and the rollers, which facilitates subsequent rolling.

[0026] The crushed rapeseed is conditioned in a softening pot 3 (by adding water or steam) to control the moisture content at 10%-12% and raise the temperature to 60-70℃, which softens the texture of the oilseed, enhances its plasticity, and facilitates the forming of rolled blanks.

[0027] The softened rapeseed is rolled into thin sheets (flat sheets) with a thickness of 0.3-0.5 mm by the rolling mill 4, which destroys the cell structure of the oilseed, shortens the oil outflow path, and increases the oil yield.

[0028] The oilseed cakes are heated and their moisture content adjusted in a steaming and frying pan to further break down the oilseed cells, while simultaneously reducing the viscosity and increasing the fluidity of the oil. During the process, the moisture content is controlled at 1%-3%, and the temperature is raised to 100-110℃ (adjusted according to the pressing process) to ensure the cakes are "cooked but not burnt, tender but not crumbly," thus preparing them for pressing.

[0029] The steamed and roasted flakes are initially pressed using a spiral prepresser to extract 80%-85% of the oil, yielding prepressed crude oil and prepressed cake (oil content approximately 12%-18%).

[0030] The following is the rapeseed pressing process implemented by the pressing system described in this application, covering the main steps from raw material pretreatment to finished product processing: I. Raw material pretreatment 1. Cleaning and impurity removal: Use equipment such as vibrating screens and magnetic separators to remove soil, stones, weeds, metal impurities, etc. from rapeseed to avoid damaging subsequent equipment or affecting the quality of oil.

[0031] 2. Crushing: The cleaned rapeseed is crushed into 4-8 pieces using a crusher to increase the contact area between the oilseed and the rollers, which facilitates subsequent rolling.

[0032] 3. Softening: The crushed rapeseed is conditioned (by adding water or steam) to control the moisture content at 10%-12% and raise the temperature to 60-70℃, which softens the texture of the oilseed, enhances its plasticity, and facilitates the forming of the billet.

[0033] 4. Rolling: The softened rapeseed is rolled into thin sheets (sheets) with a thickness of 0.3-0.5mm using a rolling mill, which breaks down the cell structure of the oilseed, shortens the oil outflow path, and increases the oil yield.

[0034] II. Steaming and Stir-frying By heating and adjusting the moisture content of the raw materials in a steaming or frying pan, the oil cells are further broken down, while the viscosity of the oil is reduced and its fluidity is enhanced.

[0035] During the process, the moisture content is controlled at 1%-3%, and the temperature is raised to 100-110℃ (adjusted according to the pressing process) so that the flakes reach a state of "cooked but not burnt, crisp but not broken", which prepares them for pressing.

[0036] III. Oil extraction by pressing 1. Pre-pressing: The steamed and roasted flakes are pre-pressed using a screw pre-presser to extract 80%-85% of the oil, yielding pre-pressed crude oil and pre-pressed cake (oil content of about 12%-18%).

[0037] 2. Extraction: To achieve a higher oil yield, the pre-pressed cake is crushed and fed into an extractor. The residual oil is extracted by soaking in No. 6 solvent oil (or other food-grade solvent) to obtain a mixed oil and wet meal. The mixed oil is evaporated and stripped to remove the solvent, yielding crude oil. The wet meal is dried to become rapeseed meal (which can be used as feed).

[0038] IV. Refining of crude oil 1. Degumming: Add hot water (or dilute acid) to crude oil, stir and let stand, so that the gums (phospholipids, etc.) in the oil absorb water, swell and precipitate. Remove the gums by centrifugation to obtain degummed oil.

[0039] 2. Deacidification: Add food-grade alkali (such as sodium hydroxide) to neutralize the free fatty acids in the oil, generating soap residue precipitate, which is then separated to obtain deacidified oil (reducing the acid value of the oil).

[0040] 3. Decolorization: Add adsorbents such as activated clay and activated carbon to the deacidified oil, stir at 80-100℃ to adsorb pigments and impurities, and filter to obtain light-colored decolorized oil.

[0041] 4. Dewaxing: For rapeseed oil with high wax content, the deodorized oil is cooled to 20-25℃ to allow the wax to crystallize and precipitate. After filtration, clear refined rapeseed oil is obtained.

[0042] V. Finished Product Packaging After passing inspection, refined rapeseed oil is filtered to remove minute impurities, then measured and bottled (in bottles or barrels) to become a finished rapeseed oil product that can be sold on the market.

[0043] The above processes can be adjusted according to the production scale (small-scale pressing or large-scale industrial production) and product demand (such as cold pressing or hot pressing). The core objective is to efficiently extract oil and ensure product quality.

[0044] In the rapeseed pressing process, the degumming, deacidification, decolorization, and dewaxing units are carried out in the following ways: Degumming unit: The main equipment includes a hydration tank, a mixer, and a centrifuge. The hydration tank is used to add hot water or phosphoric acid solution to cause phospholipids to form colloidal precipitates. The mixer is used to mix the crude oil with the additive solution, and the centrifuge is used to separate the formed colloidal impurities.

[0045] Deacidification unit: The equipment includes an alkali refining tank, a mixer, a centrifuge or plate and frame filter press, etc. The alkali refining tank is used to add alkali solution and mix it with crude oil. The mixer ensures that the alkali solution and oil are fully mixed. The centrifuge or plate and frame filter press is used to separate soap residue from oil.

[0046] Decolorization Unit: The equipment includes a decolorization tank, heater, and filter. The decolorization tank is used to add the adsorbent and mix it with the oil, the heater provides the required temperature conditions, and the filter is used to remove the adsorbent.

[0047] Dewaxing unit: Generally uses crystallizer and filter. The crystallizer is used to cool the deodorized oil, causing the wax to crystallize and precipitate out. The filter is used to separate the wax crystals to obtain clear, refined rapeseed oil.

[0048] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A rapeseed oil pressing system, characterized in that; The system consists of a raw material pretreatment production line, an oil pressing production line, and a crude oil refining production line. The raw material pretreatment production line includes screening equipment (1), crusher (2), softening pot (3), rolling mill (4) and steaming and frying pot (5); the pressing and oil extraction production line includes spiral prepresser (6), cake crusher (7), extractor (8) and crude oil storage tank (9); the crude oil refining production line includes degumming unit, deacidification unit, decolorization unit and dewaxing unit; The output end of the screening device (1) is connected to the crusher (2) through a transmission mechanism. The output end of the crusher (2) is connected to the softening pot (3) through a transmission mechanism. The output end of the softening pot (3) is connected to the rolling mill (4) through a transmission mechanism. The output end of the rolling mill (4) is connected to the steaming and frying pot (5) through a transmission mechanism. The steaming and frying pot (5) is connected to the screw prepresser (6) through a transmission pipeline. The prepressed cake outlet of the screw prepresser (6) is connected to the cake crusher (7). The cake crusher (7) is connected to the extractor (8). The prepressed cake is crushed and sent to the extractor (8). The prepressed crude oil outlet of the cake crusher (7) is connected to the crude oil storage tank (9) through a pipeline. The crude oil outlet of the extractor (8) is connected to the crude oil storage tank (9) through a pipeline. The wet meal outlet of the extractor (8) is connected to the drying device (10) through a transmission device. After being dried by the drying device (10), it becomes rapeseed meal. The degumming unit includes a hydration tank (11), a mixer A (12), and a centrifuge A (13). The mixer A (12) is connected to the crude oil storage tank (9) and the hydration tank (11) respectively. The crude oil storage tank (9) feeds crude oil into the mixer A (12), and the centrifuge A (13) is connected in sequence. The hydration tank (11) is used to add hot water or phosphoric acid solution to the mixer A (12). The mixer A (12) is used to mix the crude oil and the additive solution. The output end of the mixer A (12) is connected to the centrifuge A (13), which is used to separate the formed gum impurities. The deacidification unit includes an alkali refining tank (14), a mixer B (15), and a centrifuge B (16); the mixer B (15) is connected to the outlet end of the centrifuge A (13), the alkali refining tank (14) is used to add alkali solution to the mixer B (15) and mix it with the degummed crude oil, the mixer B (15) ensures that the alkali solution and the oil are fully mixed, the outlet end of the mixer B (15) is connected to the centrifuge B (16), and the centrifuge B (16) is used to separate soap residue from oil; The decolorization unit includes a decolorization tank (17) and a filter A (18); an adsorbent is added to the decolorization tank (17) and mixed with the deacidified oil. The output end of the decolorization tank (17) is connected to the filter A (18). The filter A (18) is used to remove the adsorbent. After filtration, a light-colored decolorized oil is obtained. The dewaxing unit includes a crystallizer (19) and a filter B (20); the crystallizer (19) is connected to the filter A (18). The crystallizer (19) is used to cool the decolorized oil and cause the wax to crystallize and precipitate. The output end of the crystallizer (19) is connected to the filter B (20). The filter B (20) is used to separate the wax crystals to obtain clear refined rapeseed oil.

2. The rapeseed oil pressing system according to claim 1, characterized in that; The screening equipment (1) is a vibrating screen or magnetic separator to remove soil, stones, weeds and metal impurities from rapeseed, so as to avoid damaging subsequent equipment or affecting the quality of oil.

3. The rapeseed oil pressing system according to claim 1, characterized in that; The crusher (2) is used to crush the cleaned rapeseed into 4-8 pieces, increasing the contact area between the oilseed and the rolls, which is convenient for subsequent rolling. The crushed rapeseed is conditioned in the softening pot (3) to control the moisture content at 10%-12% and the temperature at 60-70℃. The softened rapeseed is rolled into thin sheets with a thickness of 0.3-0.5mm by the rolling mill (4). The sheets are heated and the moisture is adjusted by the steaming and frying pot (5) to further break down the oilseed cells and reduce the viscosity and increase the fluidity of the oil. The moisture content is controlled at 1%-3% and the temperature is raised to 100-110℃.

4. The rapeseed oil pressing system according to claim 1, characterized in that; A spiral prepresser (6) is used to pre-press the steamed and fried flakes to extract 80%-85% of the oil, resulting in pre-pressed crude oil and pre-pressed cake.

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