Grease refining dewaxing system

Abstract

The utility model discloses a grease refining dewaxing system, which comprises a decoloring oil tank, a crystallizing tank and a dewaxing filter, the crystallizing tank and the dewaxing filter are respectively connected with the decoloring oil tank in an on-off manner, the crystallizing tank is communicated with the dewaxing filter to form a first oil way for circulating decoloring oil in the decoloring oil tank, and the first oil way flows from the crystallizing tank to the dewaxing filter, a transfer tank is further arranged between the decoloring oil tank and the dewaxing filter, a second oil way is formed between the dewaxing filter and the transfer tank, and at least one of the first oil way and the second oil way can be selectively activated. Compared with the prior art, the utility model can solve the problem of adhesion of wax and ensure the quality of products.

Description

Technical Field

[0001] This utility model relates to a dewaxing system for oil refining, belonging to the field of oil dewaxing. Background Technology

[0002] The main purpose of oil refining and dewaxing is to remove wax from oils to improve their quality and applicability. Specific objectives include:

[0003] 1. Improved appearance: Wax can make oils cloudy at low temperatures, and dewaxing makes the oils clearer and more transparent.

[0004] 2. Improved texture: Wax can affect the texture, and dewaxing makes the oil smoother.

[0005] 3. Enhanced stability: Waxes crystallize and precipitate at low temperatures, and dewaxing the oil improves its low-temperature stability.

[0006] 4. Extend shelf life: Wax may accelerate the oxidation of oils, and dewaxing helps to extend shelf life.

[0007] 5. Meeting processing requirements: Some food and industrial applications require oils to be free of waxes, and dewaxing can meet these requirements.

[0008] Existing dewaxing technology uses a cooling crystallization method, which involves adding diatomaceous earth as wax nuclei and using cooling coils in a crystallization tank to lower the oil temperature, causing the wax to crystallize (5-10℃). This low temperature is maintained for a certain period to allow for complete crystallization. A filter is then used to separate the wax crystals. However, during production, the cooling coils are in prolonged contact with the oil, and due to the low coil temperature, wax deposits accumulate on their surface, reducing heat exchange efficiency and preventing the set temperature from being reached, thus posing a quality risk. After prolonged filtration and cleaning, the filter screen becomes clogged with wax, reducing filtration efficiency, necessitating replacement of the filter plates to maintain filtration effectiveness. Utility Model Content

[0009] To solve the above-mentioned technical problems, this utility model provides an oil refining and dewaxing system that can solve the problem of wax adhesion and ensure product quality.

[0010] The technical solution of this utility model is:

[0011] A dewaxing system for oil refining includes a decolorizing oil tank and a crystallizing tank and a dewaxing filter respectively disconnectably connected to the decolorizing oil tank. The crystallizing tank is connected to the dewaxing filter and forms a first oil path for the decolorizing oil in the decolorizing oil tank to flow from the crystallizing tank to the dewaxing filter. The first oil path flows from the crystallizing tank to the dewaxing filter. A transfer tank is also provided between the decolorizing oil tank and the dewaxing filter, and a second oil path is formed between the dewaxing filter and the transfer tank. At least one of the first oil path and the second oil path can be selectively activated.

[0012] As a further improvement of this utility model, at least one of the first oil circuit and the second oil circuit is a recirculating type.

[0013] As a further improvement of this utility model, a transport pump is also provided between the crystallization tank and the dewaxing filter, and the transport pump is configured to pump the decolorized oil in the crystallization tank to the dewaxing filter.

[0014] As a further improvement of this utility model, the transport pump is connected in series with the transfer tank and the dewaxing filter, and is configured to pump the decolorizing oil in the transfer tank to the dewaxing filter.

[0015] As a further improvement of this utility model, the crystallization tank is provided with a condenser pipe for cooling water to circulate, and the decolorizing oil flows along the outer wall of the condenser pipe.

[0016] As a further improvement of this utility model, the crystallization tank is also provided with a stirring element extending in the same direction as the crystallization tank, and there are several condenser tubes, with the stirring element located between the several condenser tubes.

[0017] As a further improvement of this utility model, at least two dewaxing filters are provided, each having a first oil passage connected to the crystallization tank and a second oil passage connected to the transfer tank. Only one of the first oil passage and the second oil passage connected to the same dewaxing filter can be activated at the same time.

[0018] As a further improvement of this utility model, a heat exchanger is connected in series between the decolorizing oil tank and the crystallization tank, and the heat exchanger is configured to be activated to absorb the heat of the decolorizing oil.

[0019] As a further improvement of this utility model, the oil refining and dewaxing system has a working state and a shutdown state. When in the working state, the heat exchanger is turned on and absorbs the heat of the decolorized oil to be flowed into the crystallization tank; when in the shutdown state, the heat exchanger is turned off and the decolorized oil flows directly into the crystallization tank.

[0020] As a further improvement of this utility model, a return pipeline is provided between the heat exchanger and the dewaxing filter. The decolorized oil that has not been heated by the heat exchanger flows into the heat exchanger through the return pipeline after passing through the dewaxing filter, and then flows into the crystallization tank after being heated by the heat exchanger.

[0021] The beneficial technical effects of this utility model are as follows: The oil refining and dewaxing system of this utility model connects the crystallization tank and the dewaxing filter to form a first oil path for the decolorized oil in the decolorizing oil tank to flow. The first oil path flows from the crystallization tank to the dewaxing filter. A transfer tank is set between the decolorizing oil tank and the dewaxing filter, and a second oil path is formed between the dewaxing filter and the transfer tank. Then, when at least one of the first oil path and the second oil path is selectively activated, the wax adhering in the crystallization tank and the dewaxing filter can be cleaned, thereby improving the quality of the product. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of a dewaxing system for oil refining according to a preferred embodiment of the present utility model. Detailed Implementation

[0023] In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0024] Please see Figure 1 As shown, this utility model discloses an oil refining and dewaxing system 100, including a decolorizing oil tank 3, a crystallizing tank 4 and a dewaxing filter 1 respectively connected to the decolorizing oil tank 3. The crystallizing tank 4 is connected to the dewaxing filter 1, forming a first oil path for the decolorizing oil in the decolorizing oil tank 4 to flow from the crystallizing tank 4 to the dewaxing filter 1. The crystallizing tank 4 is equipped with a condenser pipe 2 for cooling water to flow through, and the decolorizing oil flows along the outer wall of the condenser pipe 2. Typically, diatomaceous earth is placed in the crystallizing tank 4, which serves as a wax crystal nucleus. The condenser pipe 2 in the crystallizing tank 4 cools the oil, causing the wax to crystallize and precipitate. Finally, the precipitated wax crystals enter the dewaxing filter 1 through the first oil path and are filtered out.

[0025] In this embodiment, the first oil circuit is a circulating oil circuit, which is circulated between the crystallization tank 4 and the dewaxing filter 1. When wax residue adheres to the outer wall of the condenser tube 2 in the crystallization tank 4 or inside the dewaxing filter 1, affecting production quality, the crystallization tank 4 and the dewaxing filter 1 can be flushed with the decolorizing oil to remove the adhered wax residue. Of course, the decolorizing oil used to remove the wax residue is a high-temperature oil, approximately 90°C. Preferably, the crystallization tank 4 is also equipped with a stirring element 6 extending in the same direction as the crystallization tank 4, and there are several condenser tubes 2, with the stirring element 6 located between the several condenser tubes 2. By setting the stirring element 6, the decolorizing oil can fully flush the outer wall of the condenser tube 2 or the dewaxing filter 1, ensuring the removal of the adhered wax residue.

[0026] Preferably, a transfer pump 7 is also provided between the crystallization tank 4 and the dewaxing filter 1. The transfer pump 7 is configured to pump the decolorized oil in the crystallization tank 4 into the dewaxing filter 1. The transfer pump 7 is preferably a centrifugal pump, which uses centrifugal force to pump the decolorized oil in the crystallization tank 4 into the dewaxing filter 1.

[0027] In this embodiment, the decolorizing oil is used in subsequent processes. Therefore, after returning the decolorizing oil to the preceding dewaxing process, it can still be used in subsequent processes, avoiding waste of resources. Therefore, a heat exchanger 5 is connected in series between the decolorizing oil tank 3 and the crystallization tank 4. The heat exchanger 5 is configured to be activated to absorb heat from the decolorizing oil. Generally, the oil temperature required for normal dewaxing and cleaning of adhering wax is different. Therefore, during normal dewaxing, the heat exchanger 5 absorbs heat from the decolorizing oil, keeping it at a lower temperature so it can participate in the subsequent dewaxing process. When cleaning of adhering wax is required, the heat exchanger 5 is turned off, allowing the high-temperature decolorizing oil to directly enter the crystallization tank 4, thereby cleaning the outer wall of the condenser 2 and the dewaxing filter 1.

[0028] In other words, the oil refining and dewaxing system 100 has an operating state and a shutdown state. When operating, the heat exchanger 5 is open and absorbs heat from the decolorized oil to be flowed into the crystallization tank 4; when shut down, the heat exchanger 5 is closed, and the decolorized oil flows directly into the crystallization tank 4. Therefore, a return pipe 8 is also provided between the heat exchanger 5 and the dewaxing filter 1. The decolorized oil, after not being heated by the heat exchanger 5, flows into the heat exchanger 5 through the return pipe 8 after passing through the dewaxing filter 1, and then flows into the crystallization tank 4 after being heated by the heat exchanger 5. This achieves the recycling of the decolorized oil and avoids resource waste.

[0029] In this embodiment, the oil refining and dewaxing system 100 also has a second oil circuit independent of the first oil circuit, and a transfer tank 9 is provided between the decolorizing oil tank 3 and the dewaxing filter 1. The second oil circuit is formed between the dewaxing filter 1 and the transfer tank 9, and at least one of the first oil circuit and the second oil circuit can be selectively activated.

[0030] Preferably, at least two dewaxing filters 1 are provided, each having a first oil passage connected to the crystallization tank 4 and a second oil passage connected to the transfer tank 9. Only one of the first and second oil passages connected to the same dewaxing filter 1 can be activated at a time. Preferably, the transport pump 7 is connected in series with the transfer tank 9 and the dewaxing filter 1, and in series with the crystallization tank 4 and the dewaxing filter 1, and is configured to pump the decolorizing oil in the transfer tank 9 to the dewaxing filter 1, or pump the oil in the crystallization tank 4 to the dewaxing filter 1.

[0031] Specifically, the cleaning of the oil refining and dewaxing system 100 can be divided into two modules: an online cleaning module and a shutdown cleaning module. During normal operation, the crystallization tank 4 and one of the dewaxing filters 1 are running normally for dewaxing. The second oil circuit of the other standby dewaxing filter 1 is opened. The decolorizing oil in the decolorizing oil tank 3 passes through the transfer tank 9 and the transport pump 7, then enters the corresponding dewaxing filter 1 and returns to the transfer tank 9, completing a cycle to continuously flush and clean the standby dewaxing filter 1. After cleaning, the oil returns to the heat exchanger 5 through the return pipe 8 connected to the second oil circuit, and then enters the crystallization tank 4 to begin normal dewaxing. Furthermore, if the other dewaxing filter 1 becomes clogged, it can be replaced immediately to ensure efficiency. When the crystallization tank 4 needs to be cleaned, the shutdown cleaning module needs to be activated, that is, the second oil circuit and heat exchanger 5 are shut down. This allows the incoming decolorizing oil to circulate back into the crystallization tank 4 after passing through the crystallization tank 4, the transport pump 7, and the dewaxing filter 1. After cleaning is completed, the oil flows back to the heat exchanger 5 through the return pipeline 8 connected to the first oil circuit, and the heat exchanger 5 is then turned on to begin normal dewaxing. Preferably, a transfer tank 9 is also provided between the decolorizing oil tank 3 and the heat exchanger 5.

[0032] In summary, the oil refining and dewaxing system 100 of this utility model connects the crystallization tank 4 and the dewaxing filter 1 to form a first oil path for the decolorized oil in the decolorized oil tank 3 to flow. The first oil path flows from the crystallization tank 4 to the dewaxing filter 1. A transfer tank 9 is set between the decolorized oil tank 3 and the dewaxing filter 1, and a second oil path is formed between the dewaxing filter 1 and the transfer tank 9. Thus, when at least one of the first oil path and the second oil path is selectively activated, the wax adhering in the crystallization tank 4 and the dewaxing filter 1 can be cleaned, thereby improving the quality of the product.

[0033] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A fat refining and dewaxing system characterized by, The system includes a decolorizing oil tank and a crystallization tank and a dewaxing filter, which are respectively disconnectably connected to the decolorizing oil tank. The crystallization tank is connected to the dewaxing filter and forms a first oil path for the decolorizing oil in the decolorizing oil tank to flow from the crystallization tank to the dewaxing filter. A transfer tank is also provided between the decolorizing oil tank and the dewaxing filter, and a second oil path is formed between the dewaxing filter and the transfer tank. At least one of the first oil path and the second oil path can be selectively activated.

2. The oil refining and dewaxing system of claim 1, wherein, At least one of the first oil circuit and the second oil circuit is a recirculating type.

3. The oil refining and dewaxing system of claim 1, wherein, A transport pump is also provided between the crystallization tank and the dewaxing filter, and the transport pump is configured to pump the decolorized oil in the crystallization tank to the dewaxing filter.

4. The oil refining and dewaxing system of claim 3, wherein, The transport pump is connected in series with the transfer tank and the dewaxing filter, and is configured to pump the decolorized oil in the transfer tank to the dewaxing filter.

5. The oil refining and dewaxing system of claim 1, wherein, The crystallization tank is equipped with a condenser pipe for cooling water to circulate, and the decolorizing oil flows along the outer wall of the condenser pipe.

6. The oil refining and dewaxing system of claim 5, wherein, The crystallization tank is also equipped with a stirring element extending in the same direction as the crystallization tank, and there are several condenser tubes, with the stirring element located between the several condenser tubes.

7. The oil refining and dewaxing system of claim 1, wherein, The dewaxing filter is provided in at least two parts, each having a first oil passage connected to the crystallization tank and a second oil passage connected to the transfer tank. Only one of the first and second oil passages connected to the same dewaxing filter can be activated at the same time.

8. The oil refining and dewaxing system of claim 1, wherein, A heat exchanger is connected in series between the decolorizing oil tank and the crystallization tank. The heat exchanger is configured to be activated to absorb heat from the decolorizing oil.

9. The oil refining and dewaxing system of claim 8, wherein, The oil refining and dewaxing system has a working state and a shutdown state. When it is in the working state, the heat exchanger is turned on and absorbs the heat of the decolorized oil to be flowed into the crystallization tank. When it is in the shutdown state, the heat exchanger is turned off and the decolorized oil flows directly into the crystallization tank.

10. The oil refining and dewaxing system of claim 8, wherein, A return pipeline is also provided between the heat exchanger and the dewaxing filter. The decolorized oil that has not been heated by the heat exchanger flows into the heat exchanger through the return pipeline after passing through the dewaxing filter, and then flows into the crystallization tank after being heated by the heat exchanger.

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