Separation device for continuously separating heavy phase in biodiesel

Abstract

The utility model provides a separation device for continuously separating a heavy phase in biodiesel. The separation device comprises a primary separator and a secondary separator, a first-stage oil phase outlet and a first-stage heavy phase outlet are respectively formed in the top end and the bottom end of the first-stage separator, a first-stage feeding hole is formed in the side wall of the top of the first-stage separator, and a spiral guide plate is arranged in the top of the first-stage separator; an oil phase discharging pipe is vertically arranged in the middle of the top of the first-stage separator, the liquid inlet end of the oil phase discharging pipe extends downwards to be close to the bottom end of the spiral guide plate, and the liquid discharging end of the oil phase discharging pipe extends to a first-stage oil phase outlet and is connected to the second-stage separator through a pipeline; at least one group of oscillation motors are uniformly mounted on the outer side wall, close to the bottom end of the spiral guide plate, of the primary separator; and the horizontal height of the oscillation motors is lower than the liquid inlet end of the oil phase discharge pipe. By adopting the separation device disclosed by the utility model, the two-phase separation efficiency can be improved, and the improvement on the existing separation equipment is convenient.

Description

Technical Field

[0001] The utility model belongs to the technical field of biodiesel, and in particular relates to a separation device for continuously separating a heavy phase in biodiesel. Background Art

[0002] Biodiesel is generated by reacting animal and vegetable oils, waste grease and short-chain alcohols (methanol, ethanol), and generates the oil phase containing fatty acid methyl ester and the heavy phase comprising alcohol, water, glycerol after the reaction. In order to obtain the product fatty acid methyl ester, it is necessary to separate the two phases. The method used in current industry mainly relies on gravity settling to separate the two phases, but the time of gravity settling is longer, generally needs more than 12h, and is not thoroughly separated. Therefore, it is necessary to design a higher separating device of separation efficiency, to improve existing separating equipment, to realize the efficient separation of heavy phase in industrial production. Utility Model Content

[0003] In view of the above problems, the utility model provides a separation device for continuously separating the heavy phase in biodiesel, thereby realizing the rapid separation of the oil phase and the heavy phase in the biodiesel production process.

[0004] The technical solution of the utility model is: a separation device for continuously separating a heavy phase from biodiesel, comprising a primary separator and a secondary separator; wherein the top and bottom ends of the primary separator are respectively provided with a primary oil phase outlet and a primary heavy phase outlet, and a primary feed inlet is provided on the top side wall; a spiral guide plate is provided in the top of the primary separator, and the liquid mixture to be separated enters the primary separator through the primary feed inlet and spirals downward through the spiral guide plate;

[0005] An oil phase discharge pipe is vertically provided in the middle of the top of the first-stage separator, the liquid inlet end of the oil phase discharge pipe extends downward to the bottom end near the spiral guide plate, and the discharge end extends upward to the first-stage oil phase outlet and is connected to the second-stage separator by a pipeline; at least one group of oscillation motors are also evenly installed on the outer side wall of the first-stage separator near the bottom end of the spiral guide plate, and the horizontal height of the oscillation motor is lower than the liquid inlet end of the oil phase discharge pipe.

[0006] The utility model is further configured such that the first-stage feed port and the wall surface of the first-stage separator are tangent to each other.

[0007] When the above-mentioned separation device is used, the liquid mixture to be separated is firstly introduced into the first-stage separator through the first-stage feed port on the top side wall of the first-stage separator, and flows downward in a spiral rotation under the guidance of the spiral guide plate; due to the difference in density between the heavy phase and the oil phase, the liquid flowing downward through the spiral guide plate causes the two phases to separate due to centrifugal force, and the heavy phase flows downward along the wall of the first-stage separator and settles, and the oil phase with low density is in the middle part of the first-stage separator, and at least one group of oscillation motors is arranged at the position where the two phases begin to separate at the bottom of the spiral guide plate, and the separation of the two phases is accelerated by the vibration of the oscillation motor, and the separated oil phase is discharged to the second-stage separator through the oil phase discharge pipe, and the heavy phase is discharged through the first-stage heavy phase outlet at the bottom, thereby realizing rapid separation of the heavy phase and the oil phase.

[0008] The utility model is further configured such that the first-stage heavy phase outlet is connected to a heavy phase discharge pipe, and the heavy phase discharge pipe is provided with a first valve; a first capacitance level gauge and a second capacitance level gauge are installed on the bottom side wall of the first-stage separator, and the installation height of the first capacitance level gauge is greater than that of the second capacitance level gauge; the two capacitance level gauges utilize the difference in electrical conductivity of the oil phase and the heavy phase to monitor the liquid phase composition at the installation location of the level gauge, thereby determining the position of the two-phase interface.

[0009] The present invention is further configured such that the first valve is electrically connected to the first and second capacitance level gauges. During use, the liquid levels of the heavy phase and the oil phase are monitored by monitoring the first and second capacitance level gauges, and the liquid levels are adjusted via the first valve. Specifically, when the first capacitance level gauge detects a sudden increase in conductivity, i.e., the heavy phase reaches the height of the level gauge, the first valve is opened to drain the heavy phase, causing the interface between the two phases to drop. When the second capacitance level gauge detects a sudden decrease in liquid conductivity, i.e., the oil phase is detected, the first valve is closed to stop draining the heavy phase. This process is repeated continuously, thereby achieving automatic drainage of the primary separator.

[0010] The present invention further provides a configuration in which the secondary separator has a secondary heavy phase outlet at its bottom end, a secondary oil phase outlet on its top sidewall, and a secondary feed inlet on its sidewall, with the discharge end of the oil phase discharge pipe connected to the secondary feed inlet. The secondary separator can be a separator with the same structure as the primary separator, or a separator employing gravity settling.

[0011] The present invention further provides that the secondary separator is a gravity sedimentation separator, and the inner diameter of the connecting pipe between the primary separator and the secondary feed port of the secondary separator is much smaller than the inner diameter of the secondary separator. This arrangement allows the oil phase separated by the primary separator to remain nearly stationary upon entering the secondary separator, thereby achieving a better sedimentation separation effect.

[0012] The utility model is further configured such that a density meter is installed on the feed pipe connected to the feed port of the first-stage separator, the connecting pipe between the first-stage separator and the second-stage separator, and the discharge pipe connected to the second-stage oil phase outlet; and is used to monitor the effect of the two-phase separation in the separation device.

[0013] The utility model is further configured such that the secondary heavy phase outlet is connected to a second heavy phase discharge pipe, and a second valve is provided on the second heavy phase discharge pipe; a third capacitance level gauge and a fourth capacitance level gauge are also installed on the side wall of the bottom of the secondary separator, and the installation height of the third capacitance level gauge is greater than that of the fourth capacitance level gauge.

[0014] The present invention is further configured such that the second valve is electrically connected to the third and fourth capacitance level gauges. When in use, the liquid levels of the heavy phase and the oil phase are monitored by monitoring the third and fourth capacitance level gauges, and the liquid levels are adjusted by the second valve.

[0015] The utility model has the following beneficial effects:

[0016] (1) The separation device of the utility model combines the separation methods of centrifugal separation and gravity sedimentation in the first-stage separator, and at the same time, an oscillating motor is added near the bottom end of the spiral guide plate where the two phases begin to separate, thereby accelerating the separation of the two phases and improving the separation efficiency of the two phases.

[0017] (2) In both the first-stage separator and the second-stage separator of the present invention, two liquid level gauges are provided at different heights of the separator, and the liquid level gauges are electrically connected to the valve for discharging the heavy phase. The liquid level at the interface of the two phases to be separated is controlled by the liquid level gauges to be maintained within a certain range, thereby achieving automatic liquid discharge.

[0018] (3) The separation device of the present invention is simple in design and can be easily modified on existing separation equipment, thus being easy to promote and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the process of the separation device of the present invention.

[0020] Figure 2 for Figure 1 A top view of the first-stage separator described in .

[0021] Figure 3 for Figure 1 Schematic diagram of the structure of the first-stage separator described in.

[0022] Among them, 1. First-stage separator, 11. First-stage oil phase outlet, 12. First-stage heavy phase outlet, 13. First-stage feed inlet, 14. Spiral guide plate, 15. Oil phase discharge pipe, 16. Oscillation motor, 17. First valve; 18. First capacitance level gauge, 19. Second capacitance level gauge; 2. Second-stage separator, 21. Second-stage oil phase outlet, 22. Second-stage heavy phase outlet, 23. Second-stage feed inlet, 24. Second valve, 25. Third capacitance level gauge, 26. Fourth capacitance level gauge, 3. First density meter, 4. Second density meter. DETAILED DESCRIPTION

[0023] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 on the present invention.

[0024] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0025] refer to Figures 1 to 3 The embodiment of the present invention provides a separation device for continuously separating a heavy phase from biodiesel, comprising a primary separator 1 and a secondary separator 2; wherein the primary separator 1 is provided with a primary oil phase outlet 11 and a primary heavy phase outlet 12 at the top and bottom, respectively, and a primary feed inlet 13 is provided on the top side wall; a spiral guide plate 14 is provided in the top of the primary separator 1, and the liquid mixture to be separated enters the primary separator 1 through the primary feed inlet 13 and spirals downward through the spiral guide plate 14;

[0026] An oil phase discharge pipe 15 is vertically provided in the middle of the top of the first-stage separator 1. The liquid inlet end of the oil phase discharge pipe 15 extends vertically downward to the bottom end near the spiral guide plate 14, and the liquid discharge end extends upward to the first-stage oil phase outlet 11 and is connected to the second-stage separator 2 through a pipeline.

[0027] Four oscillation motors 16 are evenly mounted on the outer side wall of the primary separator 1 near the bottom end of the spiral guide plate 14 . The horizontal height of the oscillation motors 16 is lower than the liquid inlet end of the oil phase discharge pipe 15 .

[0028] Furthermore, the first-stage feed port 13 is tangent to the wall of the first-stage separator 1. This arrangement allows the liquid mixture to be separated to enter along the tangent of the wall of the first-stage separator 1 and, under the guidance of the spiral guide plate 14, spirally rotate and flow downward to generate centrifugal force.

[0029] Furthermore, the first-stage heavy phase outlet 12 is connected to a heavy phase discharge pipe, and a first valve 17 is provided on the heavy phase discharge pipe; a first capacitance level gauge 18 and a second capacitance level gauge 19 are installed on the bottom side wall of the first-stage separator 1, and the installation height of the first capacitance level gauge 18 is greater than that of the second capacitance level gauge 19, which is used to monitor the liquid levels of the heavy phase and the oil phase.

[0030] Furthermore, the first valve 17 is electrically connected to the first capacitance level gauge 18 and the second capacitance level gauge 19. During use, the liquid levels of the heavy phase and the oil phase are monitored by monitoring the first capacitance level gauge 18 and the second capacitance level gauge 19, and the liquid levels are adjusted through the first valve 17. For example, when the liquid level of the heavy phase is too high and reaches the position of the first capacitance level gauge 18, the first valve 17 is opened to discharge the heavy phase and lower the liquid level of the heavy phase. When the liquid level of the oil phase is low and drops to the position of the second capacitance level gauge 19, the first valve 17 is closed to prevent the oil phase from being discharged from the bottom first-level heavy phase outlet 12.

[0031] Furthermore, the secondary separator 2 is provided with a secondary heavy phase outlet 22 at the bottom end, a secondary oil phase outlet 21 is provided on the top side wall, and a secondary feed port 23 is provided on the upper middle side wall. The discharge end of the oil phase discharge pipe 15 is connected to the secondary feed port 23. The secondary separator 2 is a gravity sedimentation separator. After the oil phase separated by the primary separator 1 enters the secondary separator 2 through the secondary feed port 23, the liquid undergoes further sedimentation separation under the action of gravity. The separated heavy phase is discharged through the secondary heavy phase outlet 22 at the bottom, and the oil phase is discharged through the secondary oil phase outlet 21 at the top.

[0032] Furthermore, the secondary heavy phase outlet 22 is connected to a second heavy phase discharge pipe, and a second valve 24 is provided on the second heavy phase discharge pipe; a third capacitance level gauge 25 and a fourth capacitance level gauge 26 are also installed on the bottom side wall of the secondary separator 2, and the installation height of the third capacitance level gauge 25 is greater than that of the fourth capacitance level gauge 26.

[0033] Furthermore, the second valve 24 is electrically connected to the third capacitance level gauge 25 and the fourth capacitance level gauge 26. When in use, the liquid levels of the heavy phase and the oil phase are monitored by monitoring the third capacitance level gauge 25 and the fourth capacitance level gauge 26, and the liquid levels are adjusted through the second valve 24.

[0034] Furthermore, the inner diameter of the connecting pipe between the primary separator 1 and the secondary separator 2 is much smaller than the inner diameter of the secondary separator 2. This arrangement allows the oil phase separated by the primary separator 1 to remain nearly stationary after entering the secondary separator 2, thereby achieving a better sedimentation separation effect.

[0035] Furthermore, a first densitometer 3 and a second densitometer 4 are installed on the feed pipe connecting the feed inlet of the primary separator 1, and on the pipe connecting the oil phase discharge pipe 15 and the second feed inlet 23, respectively, for monitoring the two-phase separation effect of the primary separator. A densitometer (not shown) is also installed on the discharge pipe connecting the secondary oil phase outlet 21 of the secondary separator 2 to monitor the two-phase separation effect after treatment by the separation device.

[0036] When using the above-mentioned separation device to separate the oil phase and the heavy phase, the liquid mixture to be separated first enters the first-stage separator 1 through the first-stage feed port 13 on the top side wall of the first-stage separator 1. Under the guidance of the spiral guide plate 14, the liquid mixture spirally rotates and flows downward, generating centrifugal force. Due to the difference in density between the heavy phase and the oil phase, the heavy phase flowing downward through the spiral guide plate 14 continues to flow downward along the wall of the first-stage separator 1 and settles, while the oil phase with lower density is located in the middle of the first-stage separator 1 and discharged through the oil phase discharge pipe 15. In addition, at least four oscillation motors 16 are installed at the bottom of the spiral guide plate 14 where the two phases begin to separate. The vibration of the oscillation motors 16 accelerates the separation of the two phases. The separated oil phase is discharged to the second-stage separator 2 through the oil phase discharge pipe 15, and the heavy phase is discharged through the first-stage heavy phase outlet 12 at the bottom, thereby achieving rapid separation of the heavy phase and the oil phase. The oil phase entering the secondary separator 2 is further separated by gravity, and the final oil phase product after separation is discharged through the secondary oil phase outlet 21, and the heavy phase is discharged through the secondary heavy phase outlet 22. After two-stage separation, the oil phase and the heavy phase are separated efficiently.

[0037] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A separation device for continuously separating the heavy phase in biodiesel, characterized in that: The invention comprises a primary separator and a secondary separator; wherein the top and bottom ends of the primary separator are respectively provided with a primary oil phase outlet and a primary heavy phase outlet, and a primary feed inlet is provided on the top side wall. A spiral guide plate is provided in the top of the primary separator, and the liquid mixture to be separated enters the primary separator through the primary feed inlet and spirals downward through the spiral guide plate; An oil phase discharge pipe is vertically provided in the middle of the top of the first-stage separator, and the liquid inlet end of the oil phase discharge pipe extends vertically downward to the bottom end near the spiral guide plate, and the discharge end passes through the first-stage oil phase outlet and is connected to the second-stage separator through a pipeline; at least one group of oscillation motors are also evenly installed on the outer wall of the first-stage separator near the bottom end of the spiral guide plate, and the horizontal height of the oscillation motor is lower than the liquid inlet end of the oil phase discharge pipe.

2. The separation device for continuously separating the heavy phase in biodiesel according to claim 1, characterized in that: The first-stage feed port is tangent to the wall surface of the first-stage separator.

3. The separation device for continuously separating the heavy phase in biodiesel according to claim 1, characterized in that: The first-stage heavy phase outlet is connected to a heavy phase discharge pipe, and a first valve is provided on the heavy phase discharge pipe; a first capacitance level gauge and a second capacitance level gauge are installed on the bottom side wall of the first-stage separator, and the installation height of the first capacitance level gauge is greater than that of the second capacitance level gauge, which is used to monitor the liquid levels of the heavy phase and the oil phase.

4. The separation device for continuously separating the heavy phase in biodiesel according to claim 3, characterized in that: The first valve is electrically connected to the first capacitance level gauge and the second capacitance level gauge.

5. The separation device for continuously separating the heavy phase in biodiesel according to claim 1, characterized in that: The bottom end of the secondary separator is provided with a secondary heavy phase outlet, the top side wall is provided with a secondary oil phase outlet, the side wall is provided with a secondary feed port, and the discharge end of the oil phase discharge pipe is connected to the secondary feed port.

6. The separation device for continuously separating the heavy phase in biodiesel according to claim 5, characterized in that: The inner diameter of the connecting pipe between the primary separator and the secondary feed port of the secondary separator is much smaller than the inner diameter of the secondary separator.

7. The separation device for continuously separating the heavy phase in biodiesel according to claim 5, characterized in that: Densitometers are installed on the feed pipe connected to the feed port of the first-stage separator, the connecting pipe between the first-stage separator and the second-stage separator, and the discharge pipe connected to the second-stage oil phase outlet.

8. The separation device for continuously separating the heavy phase in biodiesel according to claim 5, characterized in that: The secondary heavy phase outlet is connected to a second heavy phase discharge pipe, and a second valve is provided on the second heavy phase discharge pipe; a third capacitance level gauge and a fourth capacitance level gauge are also installed on the bottom side wall of the secondary separator, and the installation height of the third capacitance level gauge is greater than that of the fourth capacitance level gauge.

9. The separation device for continuously separating the heavy phase in biodiesel according to claim 8, characterized in that: The second valve is electrically connected to the third capacitance level gauge and the fourth capacitance level gauge.

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