Combined vegetable oil counter-current extraction device

Abstract

The utility model discloses a combined plant oil countercurrent extraction device, including the pre -immersion dredging residue device of series connection in proper order, multistage scraper pre -immersion machine and sieve plate type extractor, each scraper pre -immersion machine is obliquely arranged, and the middle baffle is fixed below upper chain, and the downlink section and the uplink section form the countercurrent channel of material and solvent, the sieve plate type extractor has upper and lower sieve plate and multistage oil bucket, and each level forms the cycle of spraying - collection - re - spraying, and dry material slide pipe enters first - class scraper pre -immersion machine through feed temporary storage box, feed rotary valve, and fresh solvent enters the last stage spraying of sieve plate type extractor, and the last stage oil bucket outlet of extractor is connected with the solvent inlet of last - class scraper pre -immersion machine through mixed liquid extraction pump, and the solvent outlet of pre -immersion dredging residue device is connected with the inlet of mixed liquid temporary storage tank, and the bottom outlet of mixed liquid temporary storage tank is connected with evaporation unit through evaporation feed pump. The device can improve the penetration and diffusion condition, reduce residual oil and improve the extraction efficiency.

Description

Technical Field

[0001] This utility model relates to an extractor, and more particularly to a combined vegetable oil countercurrent extraction device, belonging to the field of grain and oil machinery technology. Background Technology

[0002] In the production of oilseeds such as soybeans, rapeseed, and cottonseed, as well as related plant proteins, solvent extraction is commonly used to extract oils or soluble components. Traditional continuous extraction devices (such as circular rotary, annular, and box-type drag chain systems) typically use a top-down spray method to allow the solvent to penetrate the material layer and complete countercurrent extraction. However, when the raw material enters the extractor, the upper material bed tends to become denser, especially for materials that are prone to expansion or contain a lot of fine powder (such as white soybean flakes, rapeseed fragments, cottonseed cake powder, and soybean protein concentrate). Solvent penetration is hindered, the mass transfer rate decreases significantly, resulting in higher residual oil and increased energy consumption.

[0003] To improve impermeability, the industry has developed continuous countercurrent immersion structures, where chain scrapers agitate the material in a closed tank, loosening it for immersion in solvent, thus reducing "dead zones" to some extent. However, such structures often integrate pre-immersion and leaching into a single large device, resulting in complex chain and scraper mechanisms and high requirements for long-term operation and maintenance. Furthermore, for easily expanding or fine powder materials, the limited immersion time within a single machine may still be insufficient, leaving issues of penetration and residual oil. There are also solutions that separate the pre-immersion and leaching processes (such as spiral pre-immersion and curved scraper pre-immersion), but these suffer from drawbacks such as easy material blockage and inconvenient maintenance. There is an urgent need for a comprehensive solution that deeply couples the pre-immersion and leaching processes, modularizes the equipment, and offers greater controllability.

[0004] Chinese utility model patent CN218879833U discloses a "novel drag chain extractor." By incorporating two layers of movable grids and a chain scraper within the frame, and under continuous spraying conditions from a mixing oil pump, the oil is fully immersed in solvent oil for degreasing. Simultaneously, a large-size drive sprocket reduces the chain pitch requirement, lightens the chain weight, and lowers energy consumption; a rear-pull chain adjustment device reduces chain derailment; and three sight glasses monitor the internal status of the equipment in real time. This device, with its lightweight chain scraper and optimized design, achieves highly efficient extraction of high-quality edible oil.

[0005] The current technical solution and existing chain-type leaching machines still have the following drawbacks: Firstly, most devices lack a dedicated pre-immersion section, resulting in insufficient dispersion and pretreatment of the material entering the leaching machine. This leads to insufficient soaking of fine powders or easily swellable materials in the initial stage, resulting in poor permeability and affecting subsequent solvent penetration and extraction. Secondly, existing equipment has a relatively fixed structure and low modularity, making it difficult to flexibly increase or decrease the number of leaching stages according to process requirements, and the contact method between the material and the solvent is singular. More importantly, traditional continuous leaching processes are highly sensitive to material pretreatment and structure: when the oilseed is excessively pulverized or the flakes are not formed, the mass transfer channels in the bed are easily blocked or short-circuited, leading to a sharp drop in mass transfer efficiency and a high residual oil rate after leaching. For example, in leaching methods using multi-stage countercurrent spraying, oils with high powder density have poor permeability, and the solvent is prone to short-circuiting, resulting in some oils not being fully extracted and an increased residual oil rate; at the same time, the compaction of the loaded material layer further reduces the permeability of the mixed oil, resulting in an unsatisfactory overall leaching efficiency.

[0006] Based on the above technical background, how to enhance the pre-impregnation capability, improve the adaptability to fine powder / easily expandable materials, and construct a scalable modular extraction structure while maintaining the energy-saving and lightweight advantages of the drag chain leachator is an urgent issue to be addressed. Utility Model Content

[0007] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, and such simplifications or omissions should not be construed as limiting the scope of the present invention.

[0008] In view of the problems existing in the above and / or prior art, this utility model is proposed.

[0009] The purpose of this invention is to overcome the problems existing in the prior art and provide a combined vegetable oil countercurrent extraction device. Through the integrated extraction of pre-soaking and countercurrent leaching, it can significantly improve the permeation and diffusion conditions, reduce residual oil, and improve extraction efficiency and operational reliability.

[0010] To solve the above technical problems, this utility model provides a combined vegetable oil countercurrent extraction device, comprising: devices connected in series along the material flow direction and linked by detachable flanges. Pre-impregnation slag removal device Y0; At least two-stage scraper pre-impregnation machines are provided. Each scraper pre-impregnation machine is equipped with an inclined scraper immersion tank. The tank is equipped with a closed conveyor chain consisting of sprockets 2, chains 3 and scrapers 4. A middle partition 5 is fixed below the upper chain. The downward section and the upward section of the same chain form a countercurrent channel between the material and the solvent. The sieve plate leaching machine E1 has two layers of sieve plates and corresponding multi-stage oil hoppers. Each layer of sieve plate is equipped with a solvent spray pipe above it. The outlet of each oil hopper is connected to the corresponding solvent spray pipe above it via a mixed liquid circulation pump, forming a cycle of spraying-collecting-re-spraying. The outlet of the dry material chute G1 is connected to the inlet of the feed storage box K1, and the bottom outlet of the feed storage box K1 is connected to the feed port of the first-stage scraper pre-impregnation machine through the feed rotary valve K2. The outlet of the fresh solvent inlet pipe G5 is connected to the discharge end of the final spray pipe of the sieve plate leacher E1. The outlet of the upper final stage oil hopper of the sieve plate leacher E1 is connected to the solvent inlet of the final stage scraper pre-leacher via the mixed liquor extraction pump P2. The solvent outlet of the pre-leaching slag removal device Y0 is connected to the inlet of the mixed liquor storage tank T1. The bottom outlet of the mixed liquor storage tank T1 is connected to the evaporation unit via the evaporation feed pump P3.

[0011] Furthermore, the top gas phase outlets of the pre-impregnation slag removal device Y0, each scraper pre-impregnation machine, the sieve plate leaching machine E1, and the mixed liquor storage tank T1 are all connected to the gas phase discharge pipe G4, which is connected to the condensation recovery unit.

[0012] Furthermore, the scraper pre-impregnation machine is a four-stage machine, with adjacent stages connected by a sealed chute. The inclination angle of each stage is 25° to 30°. The feed inlet of each stage pre-impregnation machine is located in the lower part of the upper shell of the corresponding scraper leaching tank, and the discharge outlet of each stage pre-impregnation machine is located at the upper end of the lower bottom plate of the corresponding scraper leaching tank.

[0013] Furthermore, the solvent inlet of the final stage scraper pre-impregnation machine is higher than the lower edge of the discharge port of that stage, and the upper shell of the pre-impregnation slag removal device Y0 is provided with a solvent outlet for the slag removal device at a position lower than the lower edge of the discharge port.

[0014] Compared to the prior art, the advantages or beneficial effects of the embodiments of this application include at least the following: 1. Improve the extraction efficiency of easily expandable fine powder materials: By setting up multiple flat scraper pre-soaking sections before the main extractor, the pre-soaking section provides sufficient wetting and material loosening effect, so that the material is fully absorbed, swelled and loosely spread before entering the main extractor, which enhances the permeability of the powder material, significantly improves the permeation and diffusion conditions, reduces short-circuiting phenomenon, and enables the subsequent sieve plate section to extract residual oil more completely. 2. Optimize the load distribution of the leaching unit: The multi-stage pre-leaching unit shares the leaching load, avoids excessive material accumulation, ensures uniform soaking in each section, and reduces the instantaneous peak load of the main leaching section. 3. Improve the efficiency of mixed liquor recovery: Strict countercurrent connection and automated control between stages, the countercurrent spray structure allows the solvent to flow back from the leaching tail end to the pre-leaching stage, improves the utilization rate of mixed oil and strengthens the countercurrent contact between materials and solvent, reduces solvent consumption, reduces residual oil, and improves extraction efficiency and operational reliability. 4. Easy to clean and maintain: The modular structure facilitates the disassembly of each unit and internal inspection. The screen plate and flat scraper structure are easy to clean and troubleshoot, reducing maintenance intensity. 5. Reduce overall energy consumption of equipment: The combination of lightweight scraper conveyor and segmented process effectively reduces the load on the motor; at the same time, countercurrent extraction reduces ineffective circulation, resulting in significant overall energy saving. It has important practical value and promotion significance in the oil processing industry. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. The drawings are provided for reference and illustration only and are not intended to limit this utility model. Wherein: Figure 1 This is a flowchart of the combined vegetable oil countercurrent extraction device of this utility model; Figure 2 This is a schematic diagram of the prepreg unit in this utility model; Figure 3 This is a schematic diagram of the structure of a scraper prepreg machine according to this utility model; Reference numerals: Y0. Pre-impregnation slag removal device; K1. Feed storage tank; K2. Feed rotary valve; Y1. First scraper pre-impregnation machine; Y2. Second scraper pre-impregnation machine; Y3. Third scraper pre-impregnation machine; Y4. Fourth scraper pre-impregnation machine; 1. Prepreg feed inlet; 2. Prepreg sprocket; 3. Prepreg chain; 4. Prepreg scraper; 5. Middle partition; 6. Prepreg discharge outlet; E1. Sieve plate leaching device; P1-1~11: Mixture circulation pump; P2. Mixture extraction pump; P3. Evaporation feed pump; T1. Mixture temporary storage tank; G1. Dry material chute; G2. Wet meal outlet pipe; G3. Mixed liquor outlet pipe; G4. Gas phase discharge pipe; G5. Fresh solvent inlet pipe. Detailed Implementation

[0016] In the following description of this utility model, the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not mean that the device must have a specific orientation.

[0017] To make the technical means, creative features, achieved objectives and effects of this utility model easier to understand, the present utility model will be further described below with reference to specific illustrations. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0019] like Figure 1 , Figure 2 As shown, the combined vegetable oil countercurrent extraction device of this utility model includes a pre-impregnation and slag removal device Y0, a first scraper pre-impregnation machine Y1, a second scraper pre-impregnation machine Y2, a third scraper pre-impregnation machine Y3, a fourth scraper pre-impregnation machine Y4, a sieve plate extractor E1, and a mixed liquor storage tank T1. The outlet of the dry material chute G1 is connected to the inlet of the feed storage tank K1, and the bottom outlet of the feed storage tank K1 is connected to the inlet of the feed rotary valve K2. The outlet of valve K2 is connected to the inlet of the first scraper pre-impregnation machine Y1. The outlet of the first scraper pre-impregnation machine Y1 is connected to the inlet of the second scraper pre-impregnation machine Y2. The outlet of the second scraper pre-impregnation machine Y2 is connected to the inlet of the third scraper pre-impregnation machine Y3. The outlet of the third scraper pre-impregnation machine Y3 is connected to the inlet of the fourth scraper pre-impregnation machine Y4. The outlet of the fourth scraper pre-impregnation machine Y4 is connected to the upper inlet of the sieve plate leaching machine E1.

[0020] like Figure 3 As shown, the first scraper prepreg Y1 to the fourth scraper prepreg Y4 are arranged parallel and inclined to each other. Prepreg sprockets 2 are provided at the upper and lower ends respectively. The prepreg chain 3 is wrapped between the two prepreg sprockets 2. Multiple prepreg scrapers 4 are evenly arranged along the length of the prepreg chain 3. A middle partition 5 is provided below the upper prepreg chain 3. The feed inlet 1 of each prepreg is located in the lower middle part of the upper shell of the corresponding scraper prepreg. The discharge outlet 6 of each prepreg is located at the upper end of the lower bottom plate of the corresponding scraper prepreg.

[0021] Easily expandable fine powder materials, such as white bean flakes, enter the feed storage tank K1 through the dry material chute G1. The feed storage tank K1 has a certain material storage height to prevent solvent vapor leakage. The bottom of the feed storage tank K1 exits through the feed rotary valve K2 and enters the upper part of the middle partition of the first scraper pre-impregnation machine Y1. Under the push of the pre-impregnation machine scraper, it moves along the middle partition to the lower end of the first scraper pre-impregnation machine Y1. After passing the lower sprocket at the bottom, it moves upward along the lower bottom plate under the push of the pre-impregnation machine scraper. During this process, the material and solvent flow in opposite directions until the material is discharged from the pre-impregnation machine outlet and falls into the feed inlet of the second scraper pre-impregnation machine Y2 through the chute. The subsequent working process is repeated in this way until the pre-impregnated material is discharged from the outlet of the fourth scraper pre-impregnation machine Y4 and enters the upper feed inlet of the sieve plate extractor E1 through the chute.

[0022] The inner cavity of the sieve plate extractor E1 is equipped with an upper sieve plate and a lower sieve plate. The upper feed inlet is located at one end of the upper sieve plate, and the lower slag outlet is located at the same end of the lower sieve plate. The lower slag outlet of the sieve plate extractor E1 is connected to the wet meal outlet pipe G2.

[0023] The sieve plate extractor E1 has multiple oil hoppers located below the upper and lower sieve plates. The bottom outlet of each oil hopper is connected to the inlet of the mixed liquor circulation pump P1, and the outlet of each mixed liquor circulation pump P1 is connected to the solvent spray pipe above the corresponding sieve plate. Specifically, the mixed liquor circulation pump P1-1 is closest to the discharge port on the lower layer, and P1-6 is located at the tail end of the lower layer. The mixed liquor circulation pump P1-7 is closest to the tail end of the upper layer, and P1-11 is closest to the feed inlet on the upper layer. The material entering the sieve plate extractor E1 moves backward along the upper sieve plate, receiving multi-stage spraying of the mixed liquor during this movement. Upon reaching the tail end, the material falls into the lower layer and moves forward along the lower sieve plate, again receiving multi-stage spraying of the mixed liquor during this movement. Finally, it is discharged from the lower slag outlet and enters the next stage through the wet meal outlet pipe G2.

[0024] The fresh solvent inlet pipe G5 is connected to the final-stage solvent spray pipe at the lower end of the sieve plate extractor E1, allowing the freshest solvent to perform final-stage extraction and spray washing on the material about to be discharged, reducing residual solvent in the discharged material. The solvent then flows progressively from the lower layer to the tail section, with the lower layer's mixed liquor circulation pump circulating and spraying to extract the lower layer material during this flow. The outlet of the mixed liquor circulation pump P1 at the lower tail section is connected to the solvent spray pipe and oil hopper replenishment port at the upper tail section, sending the solvent from the lower tail section to the upper tail section. The solvent then flows progressively from the upper layer to the head section, with the upper layer's mixed liquor circulation pump circulating and spraying to extract the upper layer material during this flow, further extracting residual oil step by step.

[0025] The inlet of the mixed liquor extraction pump P2 is connected to the outlet of the final stage oil hopper at the top of the upper layer. The outlet of the mixed liquor extraction pump P2 is connected to the solvent inlet of the fourth scraper pre-impregnation machine Y4. The solvent inlet of the fourth scraper pre-impregnation machine Y4 is higher than the lower edge of the discharge port of each scraper pre-impregnation machine, meaning the liquid level in each scraper pre-impregnation machine is higher than the lower edge of the discharge port. The mixed liquor from the sieve plate extractor E1 enters the lower layer of the fourth scraper pre-impregnation machine Y4 and flows downward. After bypassing the lower end of the partition plate, it flows upward along the partition plate, performing countercurrent pre-impregnation of the material. Then, it flows upward from the feed inlet of the fourth scraper pre-impregnation machine Y4 and enters the discharge port of the third scraper pre-impregnation machine Y3. This continuous countercurrent flow continues until it flows out from the feed inlet of the first scraper pre-impregnation machine Y1.

[0026] An upstream device Y0 for removing slag from the first scraper pre-impregnation machine Y1 is provided. The shape and structure of the pre-impregnation slag removal device Y0 are the same as those of the first scraper pre-impregnation machine Y1. The discharge port of the pre-impregnation slag removal device Y0 is connected to the feed port of the first scraper pre-impregnation machine Y1. The mixed liquid flowing out of the feed port of the first scraper pre-impregnation machine Y1 enters the discharge port of the pre-impregnation slag removal device Y0. A small amount of material entrained in the mixed liquid is removed by the scraper of the pre-impregnation slag removal device Y0 and returned to the first scraper pre-impregnation machine Y1 to mix with the new material.

[0027] The upper shell of the pre-impregnation slag removal device Y0 is located below the lower edge of the discharge port, where the solvent outlet of the slag removal device is located. The solvent outlet of the slag removal device is connected to the inlet of the mixed liquid storage tank T1. The bottom outlet of the mixed liquid storage tank T1 is connected to the inlet of the evaporation feed pump P3. The outlet of the evaporation feed pump P3 is connected to the evaporation unit through the mixed liquid outlet pipe G3. The vegetable oil and solvent in the mixed liquid are separated by evaporation. The recovered solvent is returned to the sieve plate extractor E1 for recycling extraction through the fresh solvent inlet pipe G5.

[0028] The top exhaust ports of the pre-impregnation slag removal device Y0, the first scraper pre-impregnation machine Y1, the second scraper pre-impregnation machine Y2, the third scraper pre-impregnation machine Y3, the fourth scraper pre-impregnation machine Y4, the sieve plate leaching machine E1, and the mixed liquor storage tank T1 are all connected to the condensation recovery unit through the gas phase discharge pipe G4.

[0029] This device features a multi-stage series of scraper pre-impregnation machines and a sieve plate leachator E1 arranged sequentially along the material conveying path. The overall structure is modular and counter-current coupled, allowing for free combination via flange connections or support frames. This facilitates adjusting the number of pre-impregnation stages according to production capacity requirements. Material enters the multi-stage series of scraper pre-impregnation machines, where it is thoroughly wetted and loosened by the flat scraper conveyor before sequentially entering subsequent scraper pre-impregnation machines. The multi-stage series of scraper pre-impregnation machines provides a longer wetting time and dispersion effect, ensuring that the material achieves preliminary homogenization and penetration before entering the sieve plate leachator E1.

[0030] The material moves step by step on the sieve plates of the sieve plate leacher E1 to the lower slag outlet. Each sieve plate can uniformly filter the material, avoiding single-stage overflow and short-circuiting. In the entire system, the solvent circulates back from the discharge end to the upper part of the pre-impregnation section, forming a completely countercurrent contact with the feed, improving the mass transfer driving force.

[0031] This device combines the advantages of pre-soaking and deep leaching: the pre-soaking section provides prolonged wetting and screening of the feed, effectively solving the problems of insufficient bed penetration and channel blockage; the sieve section achieves deep extraction of the pre-soaked material through multi-layer fine spraying, further reducing residual oil. This modular, counter-current coupled structure significantly improves the drawbacks of poor material permeability and high residual oil rate in traditional continuous leaching, thereby improving the overall oil extraction efficiency and process adaptability.

[0032] The above description is merely a preferred embodiment of the present utility model, showing and describing the basic principles, main features, and advantages of the present utility model. It is not intended to limit the scope of patent protection of the present utility model. Those skilled in the art should understand that the present utility model is not limited to the above embodiments. In addition to the above embodiments, the present utility model may have other implementations without departing from the spirit and scope of the present utility model. Various changes and improvements to the present utility model are also possible. All technical solutions formed by equivalent substitutions or equivalent transformations fall within the scope of protection claimed by the present utility model. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents. Technical features not described in the present utility model can be implemented by or using existing technology, and will not be elaborated here.

Claims

1. A combined countercurrent extraction device for vegetable oil, characterized in that, include: Connected sequentially along the material flow direction and via detachable flanges Pre-impregnation slag removal device (Y0); At least two-stage scraper pre-impregnation machines are provided. Each scraper pre-impregnation machine is equipped with an inclined scraper immersion tank. The tank is equipped with a closed conveyor chain consisting of a sprocket (2), a chain (3) and a scraper (4). A partition plate (5) is fixed below the upper chain. The downward section and the upward section of the same chain form a countercurrent channel between the material and the solvent. The sieve plate leaching machine (E1) has two layers of sieve plates and corresponding multi-stage oil hoppers. Each layer of sieve plate is equipped with a solvent spray pipe above it. The outlet of each oil hopper is connected to the corresponding solvent spray pipe above it via a mixed liquid circulation pump, forming a cycle of spraying-collecting-re-spraying. The outlet of the dry material chute (G1) is connected to the inlet of the feed storage box (K1), and the bottom outlet of the feed storage box (K1) is connected to the feed port of the first-stage scraper pre-impregnation machine through the feed rotary valve (K2). The outlet of the fresh solvent inlet pipe (G5) is connected to the discharge end of the final spray pipe of the sieve plate leacher (E1). The upper final stage oil hopper outlet of the sieve plate leacher (E1) is connected to the solvent inlet of the final stage scraper pre-leacher via a mixed liquor extraction pump (P2). The solvent outlet of the pre-leaching slag removal device (Y0) is connected to the inlet of the mixed liquor storage tank (T1). The bottom outlet of the mixed liquor storage tank (T1) is connected to the evaporation unit via an evaporation feed pump (P3).

2. The combined vegetable oil countercurrent extraction device according to claim 1, characterized in that: The top gas phase outlets of the pre-leaching slag removal device (Y0), each scraper pre-leaching machine, sieve plate leaching machine (E1), and mixed liquor storage tank (T1) are all connected to the gas phase discharge pipe (G4), which is connected to the condensation recovery unit.

3. The combined vegetable oil countercurrent extraction device according to claim 1, characterized in that: The scraper pre-impregnation machine is a four-stage machine, with adjacent stages connected by a sealed chute. The inclination angle of each stage is 25° to 30°. The feed inlet of each stage is located in the lower part of the upper shell of the corresponding scraper leaching tank, and the discharge outlet of each stage is located at the upper part of the lower bottom plate of the corresponding scraper leaching tank.

4. The combined vegetable oil countercurrent extraction device according to claim 1, 2, or 3, characterized in that: The solvent inlet of the final stage scraper pre-impregnation machine is higher than the lower edge of the discharge outlet of each stage except the final stage. The solvent outlet of the pre-impregnation slag removal device (Y0) is located in the part of the upper shell that is lower than the lower edge of the discharge outlet.

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