Vegetable oil dewaxing system

Abstract

The utility model discloses a vegetable oil dewaxing system, and belongs to the technical field of vegetable oil refining processing. Comprising a decolored oil finished product tank, the decolored oil finished product tank is connected with one side of a centrifugal pump a, the other side of the centrifugal pump a is connected with a plate heat exchanger I, the other side of the plate heat exchanger I is connected with a plate heat exchanger II, the other side of the plate heat exchanger II is connected with a crystallizing tank through a pipeline, and the bottom of the crystallizing tank is connected with a pneumatic pump a; the other side of the pneumatic pump a is connected with the bottom of the horizontal blade filter, the lower part of one side of the horizontal blade filter is connected with the dewaxed oil finished product tank through a pipeline, the bottom of the horizontal blade filter is connected with the top of the turbid oil tank, the bottom of the turbid oil tank is connected with one side of the centrifugal pump b, and the other side of the centrifugal pump b is connected with the top of the crystallizing tank through a pipeline. According to the system, the time for reducing the temperature of the decolorized oil to be below 5 DEG C can be reduced by half, the energy consumption is reduced at the same time, the wax-coated oil condition is avoided, and the loss of the vegetable oil in the dewaxing process is reduced.

Description

Technical Field

[0001] This utility model relates to the field of vegetable oil refining and processing technology, specifically to a vegetable oil dewaxing system. Background Technology

[0002] Dewaxing is a crucial step in the refining of vegetable oils, and its efficiency directly impacts the overall refining time. During the 24-hour constant-temperature freezing process of the pre-dewaxed oil, the degree of wax precipitation directly affects the losses in the dewaxing step. In the existing process, the decolorized oil is cooled by water cooling through a plate heat exchanger, decreasing its temperature from approximately 45°C to 30-35°C. Simultaneously, it is pumped into a crystallization tank. Then, a refrigeration unit cools the ethylene glycol to approximately 3°C. The ethylene glycol is circulated between the jacket of the ethylene glycol tank and the crystallization tank via a centrifugal pump, further cooling the decolorized oil in the crystallization tank. The decolorized oil cools from 30-35°C to below 5°C in the crystallization tank. After reaching below 5°C, it is then kept at a constant temperature for 24 hours. A filter aid is added, and the solid wax is separated using a plate and frame filter press, thus completing the vegetable oil dewaxing operation. The process of cooling the decolorized oil from 30-35℃ to below 5℃ in the crystallization tank takes 4-6 hours. During this process, the refrigeration unit is constantly in a rapid cooling state, and the decolorized oil is also constantly in a rapid cooling state. The wax crystals (high and low melting points) in the decolorized oil precipitate too quickly, and are numerous and small, which easily form wax-encapsulated oil, increasing the loss of vegetable oil. Utility Model Content

[0003] To address the aforementioned shortcomings, this utility model provides a vegetable oil dewaxing system. This system can reduce the temperature of the decolorized oil from around 45°C to below 5°C, halving the time required and simultaneously reducing energy consumption. During the cooling process, the decolorized oil undergoes rapid cooling followed by slow cooling, preventing the formation of wax-coated oil and reducing vegetable oil loss during dewaxing.

[0004] This utility model protects a vegetable oil dewaxing system. The system includes a decolorized oil finished product tank, which is connected to one side of a centrifugal pump a. The other side of the centrifugal pump a is connected to the first inlet of a plate heat exchanger I. The first outlet of the plate heat exchanger I is connected to the first inlet of a plate heat exchanger II. The first outlet of the plate heat exchanger II is connected to at least one crystallization tank via a pipeline. The bottom of the crystallization tank is connected to one side of a pneumatic pump a. The other side of the pneumatic pump a is connected to the bottom of a horizontal leaf filter. The lower part of one side of the horizontal leaf filter is connected to the top of at least one dewaxed oil finished product tank via a pipeline. The bottom of the horizontal leaf filter is connected to the top of a turbid oil tank. The bottom of the turbid oil tank is connected to one side of a centrifugal pump b. The other side of the centrifugal pump b is connected to the top of the crystallization tank via a pipeline.

[0005] Furthermore, the crystallization tank is provided with an oil inlet valve at the top and an oil outlet valve at the bottom.

[0006] Furthermore, both the dewaxed oil finished product tank and the turbid oil tank are equipped with valves at the top and at the bottom; the decolorized oil finished product tank is equipped with valve VII at the bottom.

[0007] Furthermore, valve VIII is provided on the main pipeline connecting the plate heat exchanger II and the crystallizer.

[0008] Furthermore, the bottom of the crystallization tank is connected to the top of the additive tank, the bottom of the additive tank is connected to one side of the pneumatic pump b, and the other side of the pneumatic pump b is connected to the top of the crystallization tank through a pipeline.

[0009] Furthermore, the top of the additive tank is provided with valve IX, and the bottom is provided with valve X.

[0010] Furthermore, a valve XI is provided on the main pipeline connecting the pneumatic pump b to the top of the crystallization tank.

[0011] Furthermore, the plate heat exchanger I performs the first step of cooling the decolorizing oil through a cooling water tank. One bottom side of the cooling water tank is connected to the centrifugal pump c, the other side of the centrifugal pump c is connected to the second inlet of the plate heat exchanger I, and the second outlet of the plate heat exchanger I is connected to the top side of the cooling water tank.

[0012] Furthermore, the plate heat exchanger II performs a second cooling step for the decolorized oil via an ethylene glycol tank. One bottom side of the ethylene glycol tank is connected to centrifugal pump d, the other side of centrifugal pump d is connected to one side of the refrigeration unit, the top of the refrigeration unit is connected to the second inlet of the plate heat exchanger II, and the second outlet of the plate heat exchanger II is connected to the top of the ethylene glycol tank.

[0013] Furthermore, the ethylene glycol tank forms a circulation not only with the plate heat exchanger II, but also with the jacket of the crystallizer. A branch line extends from the pipeline between the refrigeration unit and the plate heat exchanger II, connecting to the lower part of one side of the jacket of the crystallizer, while the upper part of the other side of the jacket of the crystallizer connects to the upper part of the ethylene glycol tank.

[0014] Furthermore, the lower part of the crystallization tank is equipped with a temperature indication and control system.

[0015] The temperature indication and control system includes a temperature sensor, a PLC controller, and a solenoid valve.

[0016] A temperature sensor monitors the temperature of the decolorizing oil in the crystallization tank and sends the signal to the PLC controller. The PLC controller outputs a signal to control the opening and closing of the solenoid valve, indirectly controlling the flow rate of ethylene glycol in the pipeline. The flow rate of ethylene glycol in the pipeline determines whether the decolorizing oil in the crystallization tank is in a rapid cooling state, a slow cooling state, or a constant temperature state. (When the decolorizing oil temperature is above 8℃, the solenoid valve is at its maximum opening, and the ethylene glycol flow rate is at its maximum, indicating rapid cooling of the decolorizing oil. When the decolorizing oil temperature is between 5-8℃, the solenoid valve opening is reduced by half, and the ethylene glycol flow rate is also reduced by half, indicating slow cooling of the decolorizing oil. When the decolorizing oil temperature is below 5℃, the solenoid valve opening is reduced to its minimum, and the ethylene glycol flow rate is also reduced to its minimum, indicating a constant temperature state for the decolorizing oil.)

[0017] This invention has the following advantages: the system can reduce the temperature of the decolorizing oil from about 45°C to below 5°C, reducing the time by half and the energy consumption by the same time. It can also reduce the oil temperature by first rapidly cooling and then slowly cooling during the dewaxing process, thus avoiding the formation of wax-coated oil and reducing the loss of vegetable oil during the dewaxing process. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art 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.

[0019] in:

[0020] Figure 1 This is a schematic diagram of the structure of a vegetable oil dewaxing system in one embodiment of the present invention;

[0021] In the diagram, 1. Decolorized oil finished product tank; 2. Centrifugal pump a; 3. Plate heat exchanger I; 4. Plate heat exchanger II; 5. Crystallization tank a; 6. Crystallization tank b; 7. Crystallization tank c; 8. Pneumatic pump a; 9. Horizontal blade filter; 10. Dewaxed oil finished product tank a; 11. Dewaxed oil finished product tank b; 12. Turbid oil tank; 13. Centrifugal pump b; 14. Oil inlet valve I; 15. Oil inlet valve II; 16. Oil inlet valve III; 17. Oil outlet valve I; 18. Oil outlet valve II; 19. Oil outlet valve III; 20. Valve I; 21. Valve II; 22. Valve III; 23. Valve IV; 24. Valve V; 25. Valve VI; 26. Valve VII; 27. Valve VIII; 28. Additive tank; 29. ​​Pneumatic pump b; 30. Valve IX; 31. Valve X; 32. Valve XI; 33. Cooling water tank; 34. Centrifugal pump c; 35. Ethylene glycol tank; 36. Centrifugal pump d; 37. Refrigeration unit; 38. Temperature indication control a; 39. Temperature indication control b; 40. Temperature indication control c; Detailed Implementation

[0022] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. 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.

[0023] refer to Figure 1This utility model protects a vegetable oil dewaxing system, the system comprising a decolorized oil finished product tank 1, the decolorized oil finished product tank 1 being connected to one side of a centrifugal pump a2, the other side of centrifugal pump a2 being connected to the first inlet of a plate heat exchanger I3, the first outlet of plate heat exchanger I3 being connected to the first inlet of a plate heat exchanger II4, the first outlet of plate heat exchanger II4 being connected via pipelines to the tops of crystallizing tanks a5, b6, and c7 respectively, and crystallizing tanks a5, b6, and c7... The bottom of each tank is connected to one side of pneumatic pump a8, and the other side of pneumatic pump a8 is connected to the bottom of horizontal leaf filter 9. The lower part of one side of horizontal leaf filter 9 is connected to the top of dewaxed oil finished product tank a10 and dewaxed oil finished product tank b11 via pipelines. The bottom of horizontal leaf filter 9 is connected to the top of turbid oil tank 12, and the bottom of turbid oil tank 12 is connected to one side of centrifugal pump b13. The other side of centrifugal pump b13 is connected to the top of crystallizing tank a5, crystallizing tank b6, and crystallizing tank c7 via pipelines. In this embodiment, the number of crystallizing tanks is 3, namely crystallizing tank a5, crystallizing tank b6, and crystallizing tank c7; and the number of dewaxed oil finished product tanks is 2, namely dewaxed oil finished product tank a10 and dewaxed oil finished product tank b11. As other optional implementation methods, the number of crystallizing tanks and the number of dewaxed oil finished product tanks can be adjusted according to the specific working scenario of the production line and the capacity of the crystallizing tanks and the dewaxed oil finished product tanks, that is, the number of crystallizing tanks is at least 1, and the number of dewaxed oil finished product tanks is at least 1.

[0024] The tops of the crystallization tanks a5, b6, and c7 are respectively equipped with oil inlet valve I14, oil inlet valve II15, and oil inlet valve III16.

[0025] The bottom of the crystallization tanks a5, b6, and c7 are respectively equipped with oil outlet valve I17, oil outlet valve II18, and oil outlet valve III19.

[0026] The tops of the dewaxed oil finished product tank a10, the dewaxed oil finished product tank b11, and the turbid oil tank 12 are respectively equipped with valve I 20, valve II 21, and valve III 22.

[0027] The bottoms of the dewaxed oil finished product tank a10, the dewaxed oil finished product tank b11, and the turbid oil tank 12 are respectively equipped with valves IV23, V24, and VI25.

[0028] The bottom of the decolorized oil finished product tank 1 is equipped with valve VII26.

[0029] Valve VIII 27 is provided on the main pipeline connecting the plate heat exchanger II 4 to the top of crystallizers a 5, b 6, and c 7.

[0030] The bottoms of crystallization tanks a5, b6, and c7 are connected to the top of additive tank 28. The bottom of additive tank 28 is connected to one side of pneumatic pump b29. The other side of pneumatic pump b29 is connected to the tops of crystallization tanks a5, b6, and c7 respectively via pipelines.

[0031] The top of the additive tank 28 is equipped with valve IX30, and the bottom is equipped with valve X31.

[0032] The main pipeline connecting the pneumatic pump b29 to the top of crystallizing tanks a5, b6, and c7 is equipped with valve XI32.

[0033] The plate heat exchanger I3 performs the first step of cooling the decolorizing oil through the cooling water tank 33. The bottom side of one side of the cooling water tank 33 is connected to the centrifugal pump C34, the other side of the centrifugal pump C34 is connected to the second inlet of the plate heat exchanger I3, and the second outlet of the plate heat exchanger I3 is connected to the top side of the other side of the cooling water tank 33.

[0034] The plate heat exchanger II4 performs a second cooling step for the decolorized oil via the ethylene glycol tank 35. One bottom side of the ethylene glycol tank 35 is connected to the centrifugal pump d36, the other side of the centrifugal pump d36 is connected to one side of the refrigeration unit 37, the top of the refrigeration unit 37 is connected to the second inlet of the plate heat exchanger II4, and the second outlet of the plate heat exchanger II4 is connected to the top of the ethylene glycol tank 35.

[0035] The ethylene glycol tank 35 forms a circulation with the plate heat exchanger II4, and also with the jackets of crystallizers a5, b6, and c7. Branch lines extend from the pipeline between the refrigeration unit 37 and the plate heat exchanger II4, connecting to the lower part of one side of the jacket of crystallizers a5, b6, and c7. The upper part of the other side of the jacket of crystallizers a5, b6, and c7 connects to the upper part of the ethylene glycol tank 35.

[0036] As an optional implementation, thermometers are installed on the lower pipelines of crystallizers a5, b6, and c7 to facilitate real-time monitoring of the internal temperature by operators.

[0037] The above-mentioned device is already able to achieve the main objective of this utility model and solve the technical problems existing in the prior art. In order to achieve stable operation of the system in a more intelligent and automated way, as an expandable implementation method, the lower part of the crystallization tanks a5, b6, and c7 are respectively provided with temperature indication control a38, temperature indication control b39, and temperature indication control c40.

[0038] Temperature indicator controls a38, b39, and c40 are all composed of temperature sensors, PLC controllers, and solenoid valves. The temperature sensors monitor the temperature of the decolorizing oil in the crystallization tank, sending an input signal to the PLC controller. The PLC controller outputs a signal to control the opening and closing of the solenoid valves, indirectly controlling the flow rate of ethylene glycol in the pipeline. The flow rate of ethylene glycol in the pipeline determines whether the decolorizing oil in the crystallization tank is in a rapid cooling state, a slow cooling state, or a constant temperature state. (When the decolorizing oil temperature is above 8℃, the solenoid valve is at its maximum opening, and the ethylene glycol flow rate is at its maximum, indicating rapid cooling of the decolorizing oil. When the decolorizing oil temperature is between 5-8℃, the solenoid valve opening is reduced by half, and the ethylene glycol flow rate is also reduced by half, indicating slow cooling of the decolorizing oil. When the decolorizing oil temperature is below 5℃, the solenoid valve opening is reduced to its minimum, and the ethylene glycol flow rate is also reduced to its minimum, indicating a constant temperature state for the decolorizing oil.)

[0039] The specific implementation of this invention is as follows:

[0040] Before the dewaxing process, check and confirm that all valves are closed, and start centrifugal pumps C34 and D36, and refrigeration unit 37. Open valves VII26 and VIII27 to release the decolorizing oil from the finished decolorizing oil tank 1. Start centrifugal pump A2 to pump the decolorizing oil into crystallization tanks A5, B6, and C7. The oil undergoes the first cooling step through plate heat exchanger I3, at which point the oil temperature drops to 30-35℃. Then, it undergoes the second cooling step through plate heat exchanger II4, at which point the oil temperature drops to about 16℃. Control the opening of (oil inlet valve I14, oil inlet valve II15, and oil inlet valve III16) to allow the decolorizing oil to enter crystallization tanks A5, B6, and C7. After the decolorizing oil in finished decolorizing oil tank 1 is emptied, turn off centrifugal pumps A2 and C34, and valves VII26 and VIII27. Based on the thermometer readings on the lower pipelines of crystallizers A5, B6, and C7, the operators adjust the flow rate of ethylene glycol in the control pipelines by turning the relevant valves. This controls whether the decolorized oil in the crystallizers is in a rapid cooling state, a slow cooling state, or a constant temperature state.

[0041] Specifically, based on the thermometer readings observed by the staff, the decolorized oil in crystallization tanks a5, b6, and c7 was adjusted to a rapid cooling state from about 16°C to 8°C, a slow cooling state from 8°C to 5°C, and a constant temperature state for 24 hours after the oil temperature dropped below 5°C.

[0042] As an intelligent and automated implementation of the above-mentioned expandable embodiments, alternatively, the temperature indication control at the bottom of the crystallizer monitors the oil temperature of the decolorizing oil in the crystallizer through a temperature sensor, inputs a signal to the PLC controller, and the PLC controller outputs a signal to control the opening and closing degree of the solenoid valve, thereby indirectly controlling the amount of ethylene glycol flow in the pipeline. The amount of ethylene glycol flow in the pipeline determines whether the decolorizing oil in the crystallizer is in the above-mentioned rapid cooling state, slow cooling state, or constant temperature state.

[0043] Once the 24-hour constant temperature period is complete, open oil outlet valve I17 and valve IX30 to release 1 ton of decolorized oil that has been kept at a constant temperature for 24 hours. This oil is then transferred to additive tank 28. Afterward, close oil outlet valves I17 and IX30, and immediately add 50 kg of filter aid to additive tank 28. The filter aid used is a conventionally selected one in this field. Stir until thoroughly mixed. Open valves XI32, X31, and pneumatic pump b29 to selectively pump the thoroughly mixed oil from additive tank 28 into crystallizing tanks a5, b6, and c7. After emptying the thoroughly mixed oil from additive tank 28, close valve X31, pneumatic pump b29, and valve XI32. Then, selectively open oil outlet valves I17, II18, and III19 to release the decolorized oil from crystallizing tanks a5, b6, and c7 that have been kept at a constant temperature for 24 hours, preparing for dewaxing. Turn on pneumatic pump a8 to pump the pre-dewaxed oil into the horizontal leaf filter 9. The filter aid and wax are trapped on the blades, while the vegetable oil passes through the leaf filter screen under pressure, flows into the inner cavity of the blades, and flows out of the horizontal leaf filter 9 through the oil outlet pipe. Control valves (valve I 20, valve II 21) to allow the vegetable oil to enter the dewaxed oil finished product tank a10 and dewaxed oil finished product tank b11. The dewaxing process is complete.

[0044] If the vegetable oil to be dewaxed has a particularly high wax content, and the pressure inside the horizontal leaf filter 9 exceeds 0.4 MPa, the pneumatic pump a8 must be shut off to stop the oil inlet, and valves I20 and II21 must be closed. Then, valve III22 should be opened to release the remaining turbid oil inside the horizontal leaf filter 9 into the turbid oil tank 12. Then, valve VI25 and centrifugal pump b13 should be opened to pump the turbid oil into the crystallization tank. After cleaning the filter residue inside the horizontal leaf filter 9, the dewaxing operation can then proceed.

[0045] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the claims of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A vegetable oil dewaxing system characterized by, The system comprises a decolorized oil product tank (1) connected to one side of a centrifugal pump a (2), the other side of the centrifugal pump a (2) is connected to a first inlet of a plate heat exchanger I (3), a first outlet of the plate heat exchanger I (3) is connected to a first inlet of a plate heat exchanger II (4), a first outlet of the plate heat exchanger II (4) is connected to at least one crystallization tank through a pipeline, a bottom of the crystallization tank is connected to one side of a pneumatic pump a (8), the other side of the pneumatic pump a (8) is connected to a bottom of a horizontal blade filter (9), a lower side of one side of the horizontal blade filter (9) is connected to a top of at least one dewaxed oil product tank through a pipeline, a bottom of the horizontal blade filter (9) is connected to a top of a turbid oil tank (12), a bottom of the turbid oil tank (12) is connected to one side of a centrifugal pump b (13), the other side of the centrifugal pump b (13) is connected to a top of the crystallization tank through a pipeline.

2. The vegetable oil dewaxing system of claim 1, wherein, The top of the crystallization tank is provided with an oil inlet valve, and the bottom of the crystallization tank is provided with an oil outlet valve.

3. The vegetable oil dewaxing system of claim 1, wherein, The top of the dewaxed oil product tank and the turbid oil tank (12) is provided with a valve, and the bottom of the dewaxed oil product tank and the turbid oil tank (12) is provided with a valve; the bottom of the decolorized oil product tank (1) is provided with a valve VII (26).

4. The vegetable oil dewaxing system of claim 1, wherein, The main pipeline connected between the plate heat exchanger II (4) and the crystallization tank is provided with a valve VIII (27).

5. The vegetable oil dewaxing system of claim 1, wherein, The bottom of the crystallization tank is connected to the top of an additive tank (28), the bottom of the additive tank (28) is connected to one side of a pneumatic pump b (29), the other side of the pneumatic pump b (29) is connected to the top of the crystallization tank through a pipeline; The top of the additive tank (28) is provided with a valve IX (30), and the bottom is provided with a valve X (31).

6. The vegetable oil dewaxing system of claim 5, wherein, The main pipeline connected between the pneumatic pump b (29) and the top of the crystallization tank is provided with a valve XI (32).

7. The vegetable oil dewaxing system of claim 1, wherein, The plate heat exchanger I (3) is cooled by a cooling water tank (33) for the first step of the decolorized oil, one side of the bottom of the cooling water tank (33) is connected to a centrifugal pump c (34), the other side of the centrifugal pump c (34) is connected to a second inlet of the plate heat exchanger I (3), and a second outlet of the plate heat exchanger I (3) is connected to the other side of the top of the cooling water tank (33).

8. The vegetable oil dewaxing system of claim 1, wherein, The plate heat exchanger II (4) is cooled by a glycol tank (35) for the second step of the decolorized oil, one side of the bottom of the glycol tank (35) is connected to a centrifugal pump d (36), the other side of the centrifugal pump d (36) is connected to one side of a refrigeration unit (37), the top of the refrigeration unit (37) is connected to a second inlet of the plate heat exchanger II (4), and a second outlet of the plate heat exchanger II (4) is connected to the top of the glycol tank (35).

9. The vegetable oil dewaxing system of claim 8, wherein, The glycol tank (35) is connected to the jacket of the crystallization tank in addition to the circulation formed between the plate heat exchanger II (4), and a branch pipeline is branched from the pipeline between the refrigeration unit (37) and the plate heat exchanger II (4) and connected to one side of the lower part of the jacket of the crystallization tank, and the other side of the upper part of the jacket of the crystallization tank is connected to the upper part of the glycol tank (35).

10. The vegetable oil dewaxing system of claim 1, wherein, The lower part of the crystallization tank is provided with a temperature indication control system, The temperature indication control system comprises a temperature sensor, a PLC controller and an electromagnetic valve.

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