Vegetable oil fuel impurity removal and purification equipment and method thereof

Abstract

The invention discloses vegetable oil fuel impurity removal and purification equipment and a method thereof, and relates to the technical field of biofuel processing. The device comprises a dehydration tank, an electric heating plate is embedded in the bottom of the inner side of the dehydration tank to heat vegetable oil fuel in the dehydration tank, and a magnetic stirring mechanism is arranged at the bottom of the dehydration tank to assist the vegetable oil fuel to be uniformly heated. According to the device, solid particles and heavy impurities in vegetable oil fuel are effectively separated through high-speed rotation of the centrifugal filtering assembly by means of centrifugal force, the separated fuel sequentially passes through the first-stage filter and the second-stage filter to be subjected to multi-stage filtering, large-particle and small-particle impurities are further removed, and the purity of the fuel is remarkably improved; the vacuum environment lower than the atmospheric pressure is created through the vacuum extraction mechanism, the boiling point of water is reduced, the water in the vegetable oil fuel is rapidly evaporated into water vapor, the water vapor is discharged out of the tank through the vacuum extraction mechanism, efficient dehydration of the fuel is achieved, and the stability and combustion efficiency of the fuel are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of biofuel processing, and particularly relates to a vegetable oil fuel impurity removal and purification device and method. Background Art

[0002] With the enhancement of environmental awareness and the increasing demand for renewable energy, vegetable oil fuel, as a clean energy source, has received more and more attention. However, vegetable oil fuel often contains various impurities during the production process, such as solid particles, moisture, gums, etc. These impurities will affect the quality and combustion efficiency of the fuel.

[0003] Traditional impurity removal and purification methods usually include simple filtration, sedimentation and other steps, but these methods often have the following problems: the filtration accuracy is limited, it is impossible to effectively remove fine particles and gums, and the removal effect of moisture and some soluble impurities is not ideal, resulting in a still low purity of the purified fuel.

[0004] Therefore, a vegetable oil fuel impurity removal and purification device and method are proposed. Summary of the Invention

[0005] The purpose of the present invention is: to solve the problems raised in the above background art, the present invention provides a vegetable oil fuel impurity removal and purification device and method.

[0006] The present invention specifically adopts the following technical solutions to achieve the above purpose:

[0007] A vegetable oil fuel impurity removal and purification device and method, including a dehydration tank, an electric heating plate is embedded at the inner bottom of the dehydration tank to heat the vegetable oil fuel in the dehydration tank, a magnetic stirring mechanism is arranged at the bottom of the dehydration tank to assist in uniformly heating the vegetable oil fuel, a top cover is fixedly installed on the top surface of the dehydration tank, and a solenoid valve is arranged at the input end of the top cover. When the solenoid valve is closed, a sealed space is formed between the top cover and the dehydration tank. A vacuum extraction mechanism is arranged on the surface of the dehydration tank to extract a vacuum environment lower than the atmospheric pressure inside the dehydration tank and the top cover. A filter hopper is fixedly installed at the top of the solenoid valve, and at least two groups of limit rings are fixedly installed on the inner wall of the filter hopper. An primary filter and a secondary filter are respectively arranged inside the filter hopper and above the limit rings. A centrifugal filtration component is arranged at the top of the filter hopper for centrifugal filtration of the vegetable oil fuel suspension.

[0008] Furthermore, a drain pipe is arranged on the surface of the dehydration tank, and a valve is arranged on the surface of the drain pipe. An observation port is arranged on the front side wall of the dehydration tank for observing the dehydration condition inside the dehydration tank.

[0009] Further, the magnetic stirring mechanism includes a mounting frame fixedly installed on the bottom surface of the dehydration tank, and a first motor is fixedly installed on the top surface of the mounting frame. The output end of the first motor penetrates through the mounting frame and is fixedly connected to a rotating disk. A first magnet is embedded in the top surface of the rotating disk. A rotating shaft is fixedly installed at the inner bottom of the dehydration tank, and a stirring paddle is rotatably sleeved on the surface of the rotating shaft. A second magnet is embedded in the bottom surface of the stirring paddle. The first magnet on the surface of the rotating disk and the second magnet on the bottom surface of the stirring paddle are arranged correspondingly.

[0010] Further, the vacuum extraction mechanism includes a pipeline arranged on the surface of the dehydration tank, and a pressure gauge and a vacuum pump are respectively arranged on the surface of the pipeline. The vacuum pump is used to discharge the air and water vapor inside the dehydration tank and the top cover.

[0011] Further, the centrifugal filtration component includes a cross frame inserted into the top opening of the filter hopper. A second motor is fixedly installed on the top surface of the cross frame. The output end of the second motor is fixedly connected to a connecting shaft. The bottom end of the connecting shaft is fixedly connected to a mesh plate. A mesh cover is fixedly installed on the top surface of the mesh plate, and a filter net is attached to the inner wall of the mesh cover.

[0012] Further, the mesh plate is rotatably installed inside the filter hopper, and the top surface of the mesh plate is inclined at the edge.

[0013] Further, the primary filter is located below the mesh plate, and the secondary filter is located below the primary filter. The primary filter uses a ceramic filter, and the secondary filter uses polytetrafluoroethylene.

[0014] A method for removing impurities and purifying vegetable oil fuel includes the following steps:

[0015] Step S1: Add the vegetable oil fuel raw material into the mesh cover, start the second motor to drive the connecting shaft, the mesh plate and the mesh cover to rotate, and use centrifugal force to separate the fuel liquid and heavy impurities.

[0016] Step S2: The separated vegetable oil fuel is sequentially filtered through the primary filter and the secondary filter for multi-stage filtration to remove large particles and fine particle impurities and improve the fuel purity.

[0017] Step S3: Close the solenoid valve to seal the internal space of the dehydration tank and the top cover, extract the air inside the dehydration tank and the top cover through the vacuum extraction mechanism to form a vacuum environment lower than the atmospheric pressure, and reduce the boiling point of the water in the vegetable oil fuel.

[0018] Step S4: Start the electric heating plate to heat the vegetable oil fuel in the dehydration tank, so that the water quickly evaporates into water vapor. The water vapor is discharged from the dehydration tank through the vacuum extraction mechanism to achieve the removal and purification of the water in the vegetable oil fuel.

[0019] Step S5: Open the valve on the drain pipe and discharge the purified vegetable oil fuel from the dehydration tank.

[0020] Further, in the said steps S3 and S4, the pressure in the dehydration tank is reduced to be lower than the saturated vapor pressure of water by a vacuum extraction mechanism, so that the water in the vegetable oil fuel evaporates at a lower temperature. Meanwhile, the fuel is heated by an electric heating plate to accelerate the evaporation process, and the evaporated water vapor is discharged through the vacuum extraction mechanism, thereby effectively removing the water in the vegetable oil fuel and improving the purity of the fuel.

[0021] The beneficial effects of the present invention are as follows:

[0022] Through the high-speed rotation of the centrifugal filtration component, the solid particles and heavy impurities in the vegetable oil fuel are effectively separated by centrifugal force. The separated fuel is successively filtered through a primary filter and a secondary filter for multi-stage filtration to further remove large particles and fine particle impurities, significantly improving the purity of the fuel.

[0023] By creating a vacuum environment lower than the atmospheric pressure through the vacuum extraction mechanism, the boiling point of water is reduced, so that the water in the vegetable oil fuel quickly evaporates into water vapor and is discharged out of the tank through the vacuum extraction mechanism, realizing the efficient dehydration of the fuel and improving the stability and combustion efficiency of the fuel.

[0024] Through the combination of centrifugal filtration, multi-stage filtration and vacuum dehydration, the comprehensive removal of various impurities in the vegetable oil fuel is realized, ensuring the high quality and high purity of the fuel and meeting the production standards of modern biofuels. Brief Description of the Drawings

[0025] Figure 1 is a three-dimensional structural schematic diagram of the present invention;

[0026] Figure 2 is a side view of the present invention;

[0027] Figure 3 is a bottom view of the present invention;

[0028] Figure 4 is the present invention Figure 3 partial enlarged view of part A;

[0029] Figure 5 is a front cross-sectional view of the present invention;

[0030] Figure 6 is a schematic diagram of the mesh plate and mesh cover of the present invention;

[0031] Figure 7 is a schematic diagram of the stirring paddle of the present invention;

[0032] Figure 8 is a schematic diagram of the rotating disk of the present invention;

[0033] Reference numerals: 1, dehydration tank; 11, drain pipe; 12, valve; 13, observation port; 2, electric heating plate; 3, magnetic stirring mechanism; 301, mounting bracket; 302, first motor; 303, rotating disk; 304, first magnet; 305, rotating shaft; 306, stirring paddle; 307, second magnet; 4, top cover; 5, solenoid valve; 6, vacuum extraction mechanism; 601, pipeline; 602, pressure gauge; 603, vacuum pump; 7, filter hopper; 71, limit ring; 8, centrifugal filtration assembly; 801, cross frame; 802, second motor; 803, connecting shaft; 804, mesh plate; 805, mesh cover; 806, filter screen; 9, primary filter; 10, secondary filter. Detailed implementation manners

[0034] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. The components of the embodiments of the present invention usually described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0036] It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. In addition, the terms "first", "second", etc. are only used for descriptive distinction and cannot be understood as indicating or implying relative importance.

[0037] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "inner", "outer", "upper", etc. is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is usually placed during use. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0038] As Figures 1 to 8As shown in the figure, a vegetable oil fuel impurity removal and purification device and method include a dehydration tank 1. An electric heating plate 2 is embedded at the inner bottom of the dehydration tank 1 to heat the vegetable oil fuel in the dehydration tank 1. A magnetic stirring mechanism 3 is arranged at the bottom of the dehydration tank 1 to assist in uniformly heating the vegetable oil fuel. A top cover 4 is fixedly installed on the top surface of the dehydration tank 1, and a solenoid valve 5 is arranged at the input end of the top cover 4. When the solenoid valve 5 is closed, a sealed space is formed between the top cover 4 and the dehydration tank 1. A vacuum extraction mechanism 6 is arranged on the surface of the dehydration tank 1 to extract a vacuum environment lower than the atmospheric pressure inside the dehydration tank 1 and the top cover 4. A filter hopper 7 is fixedly installed at the top of the solenoid valve 5, and at least two groups of limit rings 71 are fixedly installed on the inner wall of the filter hopper 7. An primary filter 9 and a secondary filter 10 are respectively arranged inside the filter hopper 7 and above the limit rings 71. A centrifugal filtration component 8 is arranged at the top of the filter hopper 7 for centrifugal filtration of the vegetable oil fuel suspension.

[0039] More specifically, by adding the vegetable oil fuel raw material into the centrifugal filtration component 8, under the action of the centrifugal force generated by the high-speed rotation of the centrifugal filtration component 8, the fuel liquid and heavy impurities are effectively separated. The separated vegetable oil fuel falls onto the primary filter 9 and the secondary filter 10. The primary filter 9 and the secondary filter 10 are used to perform multi-stage filtration on the vegetable oil fuel. Through the primary filter 9, large particle impurities in the fuel are removed. Through the secondary filter 10, tiny particles are intercepted, improving the purity of the fuel. When filtering, the fuel enters the inside of the dehydration tank 1 through the top cover 4. The solenoid valve 5 is used to seal the inside of the dehydration tank 1 and the top cover 4. The vacuum extraction mechanism 6 is used to extract a vacuum inside the dehydration tank 1 and the top cover 4, so that the inside of the dehydration tank 1 and the top cover 4 is in a vacuum environment lower than the atmospheric pressure. When the pressure in the tank decreases, the boiling point of the liquid also decreases. The electric heating plate 2 is used to heat the vegetable oil fuel. The water in the vegetable oil fuel is more likely to evaporate due to the decrease in the boiling point. Since the pressure in the tank is lower than the saturated vapor pressure of water, the water will quickly evaporate into water vapor, and the water vapor will be discharged through the vacuum extraction mechanism 6, realizing the removal of the water in the vegetable oil fuel and purifying the vegetable oil fuel.

[0040] A drain pipe 11 is arranged on the surface of the dehydration tank 1, and a valve 12 is arranged on the surface of the drain pipe 11. An observation port 13 is arranged on the front side wall of the dehydration tank 1 for observing the dehydration condition inside the dehydration tank 1.

[0041] More specifically, by opening the valve 12 on the drain pipe 11, the vegetable oil fuel inside the dehydration tank 1 can be discharged through the drain pipe 11. The dehydration condition inside the dehydration tank 1 can be observed through the observation port 13 on the front side wall of the dehydration tank 1.

[0042] The magnetic stirring mechanism 3 includes a mounting frame 301 fixedly installed on the bottom surface of the dehydration tank 1. The top surface of the mounting frame 301 is fixedly installed with a first motor 302. The output end of the first motor 302 penetrates through the mounting frame 301 and is fixedly connected with a rotating disk 303. A first magnet 304 is embedded on the top surface of the rotating disk 303. The inner bottom of the dehydration tank 1 is fixedly installed with a rotating shaft 305. A stirring paddle 306 is rotatably sleeved on the surface of the rotating shaft 305. A second magnet 307 is embedded on the bottom surface of the stirring paddle 306. The first magnet 304 on the surface of the rotating disk 303 and the second magnet 307 on the bottom surface of the stirring paddle 306 are arranged in correspondence.

[0043] More specifically, the first motor 302 drives the rotating disk 303 and the first magnet 304 on its surface to rotate. Through the correspondence between the first magnet 304 on the surface of the rotating disk 303 and the second magnet 307 on the surface of the stirring paddle 306, the stirring paddle 306 is driven to rotate on the surface of the rotating shaft 305 by the magnetic force between the first magnet 304 and the second magnet 307, so as to stir the vegetable oil fuel inside the dehydration tank 1 during heating, and the uniform heating of the vegetable oil fuel can be realized.

[0044] The vacuum extraction mechanism 6 includes a pipeline 601 arranged on the surface of the dehydration tank 1. A pressure gauge 602 and a vacuum pump 603 are respectively arranged on the surface of the pipeline 601. The vacuum pump 603 is used to discharge the air and water vapor inside the dehydration tank 1 and the top cover 4.

[0045] More specifically, the vacuum pump 603 is used to extract the air inside the dehydration tank 1 through the pipeline 601, and at the same time, the water vapor inside the dehydration tank 1 can also be discharged. The pressure gauge 602 is used to detect the air pressure inside the dehydration tank 1.

[0046] The centrifugal filtration component 8 includes a cross frame 801 inserted into the top opening of the filter hopper 7. The top surface of the cross frame 801 is fixedly installed with a second motor 802. The output end of the second motor 802 is fixedly connected with a connecting shaft 803. The bottom end of the connecting shaft 803 is fixedly connected with a mesh plate 804. A mesh cover 805 is fixedly installed on the top surface of the mesh plate 804. A filter net 806 is attached to the inner wall of the mesh cover 805.

[0047] More specifically, the second motor 802 drives the connecting shaft 803, the mesh plate 804 and the mesh cover 805 to rotate. The vegetable oil fuel stock solution is heated into the mesh cover 805, so that when it rotates, the centrifugal filtration of the vegetable oil fuel stock solution through the filter net 806 can be realized.

[0048] The mesh plate 804 is rotatably installed inside the filter hopper 7, and the top surface of the mesh plate 804 is inclined at the edge.

[0049] More specifically, it is inclined at the top surface of the screen plate 804 and located at its edge, which facilitates the discharge of the centrifugally filtered vegetable oil fuel.

[0050] The primary filter 9 is located below the screen plate 804, and the secondary filter 10 is located below the primary filter 9. The primary filter 9 is a ceramic filter, and the secondary filter 10 is a polytetrafluoroethylene filter.

[0051] More specifically, the multi-stage filtration and purification of the vegetable oil fuel is achieved through the filter net 806, the net cover 805, the screen plate 804, the primary filter 9, and the secondary filter 10.

[0052] A method for removing impurities and purifying vegetable oil fuel includes the following steps:

[0053] Step S1: Add the vegetable oil fuel raw material into the net cover 805, start the second motor 802 to drive the connecting shaft 803, the screen plate 804, and the net cover 805 to rotate, and use centrifugal force to separate the fuel liquid and heavy impurities.

[0054] Step S2: The separated vegetable oil fuel is sequentially filtered through the primary filter 9 and the secondary filter 10 for multi-stage filtration to remove large particle and micro-particle impurities and improve the fuel purity.

[0055] Step S3: Close the solenoid valve 5 to seal the internal space of the dehydration tank 1 and the top cover 4, and extract the air in the dehydration tank 1 and the top cover 4 through the vacuum extraction mechanism 6 to form a vacuum environment lower than the atmospheric pressure, reducing the boiling point of the water in the vegetable oil fuel.

[0056] Step S4: Start the electric heating plate 2 to heat the vegetable oil fuel in the dehydration tank 1, so that the water quickly evaporates into water vapor. The water vapor is discharged from the dehydration tank 1 through the vacuum extraction mechanism 6, realizing the removal and purification of the water in the vegetable oil fuel.

[0057] Step S5: Open the valve 12 on the drain pipe 11 to discharge the purified vegetable oil fuel from the dehydration tank 1.

[0058] In steps S3 and S4, the pressure in the dehydration tank 1 is reduced to be lower than the saturated vapor pressure of water through the vacuum extraction mechanism 6, so that the water in the vegetable oil fuel evaporates at a lower temperature. At the same time, the electric heating plate 2 is used to heat the fuel to accelerate the evaporation process of the water. The evaporated water vapor is discharged through the vacuum extraction mechanism 6, thereby effectively removing the water in the vegetable oil fuel and improving the purity of the fuel.

[0059] To sum up:

[0060] Through the high-speed rotation of the centrifugal filtration assembly 8, solid particles and heavy impurities in the vegetable oil fuel are effectively separated by centrifugal force. The separated fuel is successively filtered through a primary filter 9 and a secondary filter 10 for multi-stage filtration to further remove large particles and fine particle impurities, significantly improving the purity of the fuel. By means of the vacuum extraction mechanism 6, a vacuum environment lower than atmospheric pressure is created to lower the boiling point of water, enabling the water in the vegetable oil fuel to rapidly evaporate into water vapor and be discharged outside the tank through the vacuum extraction mechanism 6, achieving efficient dehydration of the fuel and improving the stability and combustion efficiency of the fuel.

[0061] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art of this industry should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification is only the principle of the present invention. Without departing from the spirit and scope of the present invention, various changes and improvements will occur to the present invention, and all these changes and improvements fall within the scope of the present invention claimed. The scope of protection required by the present invention is defined by the appended claims and their equivalents.

Claims

1. A vegetable oil fuel impurity removal and purification device, characterized in that: The invention comprises a dehydration tank (1), wherein an electric heating plate (2) is embedded in the inner bottom of the dehydration tank (1) to heat the vegetable oil fuel in the dehydration tank (1), and a magnetic stirring mechanism (3) is arranged at the bottom of the dehydration tank (1) to assist in uniform heating of the vegetable oil fuel. A top cover (4) is fixedly mounted on the top surface of the dehydration tank (1), and an electromagnetic valve (5) is arranged at the input end of the top cover (4). When the electromagnetic valve (5) is closed, a sealed space is formed inside the top cover (4) and the dehydration tank (1), and a magnetic stirring mechanism (3) is arranged on the surface of the dehydration tank (1). The vacuum extraction mechanism (6) extracts a vacuum environment below atmospheric pressure from the interior of the dehydration tank (1) and the top cover (4); a filter bucket (7) is fixedly installed on the top of the solenoid valve (5); and at least two sets of limit rings (71) are fixedly installed on the inner wall of the filter bucket (7); and a primary filter (9) and a secondary filter (10) are respectively arranged inside the filter bucket (7) and above the limit rings (71); and a centrifugal filter assembly (8) is arranged on the top of the filter bucket (7) for centrifugally filtering the vegetable oil fuel suspension.

2. A vegetable oil fuel impurity removal and purification device according to claim 1, characterized in that: The surface of the dehydration tank (1) is provided with a drain pipe (11), and the surface of the drain pipe (11) is provided with a valve (12); the front side wall of the dehydration tank (1) is provided with an observation port (13) for observing the dehydration condition inside the dehydration tank (1).

3. The vegetable oil fuel impurity removal and purification equipment according to claim 1, characterized in that: The magnetic stirring mechanism (3) comprises a mounting frame (301) fixedly mounted on the bottom surface of the dehydration tank (1), and a first motor (302) is fixedly mounted on the top surface of the mounting frame (301), an output end of the first motor (302) passes through the mounting frame (301) and is fixedly connected to a rotating disk (303), a first magnet (304) is embedded on the top surface of the rotating disk (303), a rotating shaft (305) is fixedly mounted on the inner bottom of the dehydration tank (1), a stirring paddle (306) is rotatably sleeved on the surface of the rotating shaft (305), a second magnet (307) is embedded on the bottom surface of the stirring paddle (306), and the first magnet (304) on the surface of the rotating disk (303) and the second magnet (307) on the bottom surface of the stirring paddle (306) are arranged correspondingly.

4. The vegetable oil fuel impurity removal and purification equipment according to claim 1, characterized in that: The vacuum extraction mechanism (6) comprises a pipe (601) arranged on the surface of the dehydration tank (1), and a pressure gauge (602) and a vacuum pump (603) are respectively arranged on the surface of the pipe (601), and the air and water vapor inside the dehydration tank (1) and the top cover (4) are discharged through the vacuum pump (603).

5. The vegetable oil fuel impurity removal and purification equipment according to claim 1, characterized in that: The centrifugal filter assembly (8) comprises a cross frame (801) inserted into an opening on the top surface of the filter bucket (7); a second motor (802) is fixedly mounted on the top surface of the cross frame (801); a connecting shaft (803) is fixedly connected to the output end of the second motor (802); a bottom end of the connecting shaft (803) is fixedly connected to a mesh plate (804); a mesh cover (805) is fixedly mounted on the top surface of the mesh plate (804); and a filter screen (806) is attached to the inner wall of the mesh cover (805).

6. The impurity removal and purification equipment for vegetable oil fuel according to claim 5, characterized in that: The mesh plate (804) is rotatably installed inside the filter bucket (7), and the top surface of the mesh plate (804) is inclined at the edge.

7. The impurity removal and purification device and method of vegetable oil fuel according to claim 6, characterized in that: The primary filter (9) is located below the mesh plate (804), and the secondary filter (10) is located below the primary filter (9). The primary filter (9) is made of a ceramic filter, and the secondary filter (10) is made of polytetrafluoroethylene.

8. A method for removing impurities and purifying vegetable oil fuel according to any one of claims 1 to 7, characterized in that: The following steps are involved: Step S1: adding the vegetable oil fuel raw material into the mesh cover (805), starting the second motor (802) to drive the connecting shaft (803), the mesh plate (804) and the mesh cover (805) to rotate, and using centrifugal force to separate the fuel liquid and heavy impurities; Step S2: the separated vegetable oil fuel is sequentially filtered through a primary filter (9) and a secondary filter (10) to remove large and small particles of impurities and improve the purity of the fuel; Step S3: closing the solenoid valve (5) to seal the internal space of the dehydration tank (1) and the top cover (4), and extracting the air in the dehydration tank (1) and the top cover (4) through the vacuum extraction mechanism (6) to form a vacuum environment below atmospheric pressure, thereby reducing the boiling point of water in the vegetable oil fuel; Step S4: starting the electric heating plate (2) to heat the vegetable oil fuel in the dehydration tank (1), so that the water content is rapidly evaporated into water vapor, and the water vapor is discharged from the dehydration tank (1) through the vacuum extraction mechanism (6), thereby achieving the removal and purification of the water content in the vegetable oil fuel; Step S5: Open the valve (12) on the drain pipe (11) to discharge the purified vegetable oil fuel from the dehydration tank (1).

9. A method for removing impurities and purifying vegetable oil fuel according to claim 8, characterized in that: In the steps S3 and S4, the pressure in the dehydration tank (1) is reduced to a level lower than the saturated vapor pressure of water by means of the vacuum extraction mechanism (6), so that the water in the vegetable oil fuel evaporates at a relatively low temperature. At the same time, the fuel is heated by means of the electric heating plate (2) to accelerate the evaporation process of the water. The evaporated water vapor is discharged through the vacuum extraction mechanism (6), thereby effectively removing the water in the vegetable oil fuel and improving the purity of the fuel.

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