Grease decolorizing equipment and grease decolorizing method

Abstract

The invention provides grease decolorizing equipment and a grease decolorizing method. A baffle and multiple layers of partition plates are arranged in the decolorizing tank body, the baffle is located between the multiple layers of partition plates and an oil inlet of the decolorizing tank body, and decolorizing articles (such as carclazyte and activated carbon) are arranged on each layer of partition plate and used for decolorizing grease. The grease decolorizing equipment can further comprise a flow speed control mechanism, the flow speed control mechanism can convey grease to be decolorized into the decolorizing tank body from the oil inlet at a set speed, then the grease uniformly flows to the partition plates with the decolorizing articles under the action of the baffle plates, and the grease passes through the multiple layers of partition plates layer by layer under the action of oil pressure, so that continuous decolorizing of the grease is realized; and the adsorption decoloration of the grease can be realized without matching additional filtering equipment, so that the effect of the decoloration production process of the grease such as the natural ester insulating oil is effectively improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of oil decolorization, and in particular to an oil decolorization device and an oil decolorization method. Background Art

[0002] Natural ester insulating oil, made from natural oils and primarily composed of triglycerides of fatty acids, has attracted increasing attention and has been widely adopted in major Western countries due to its advantages over traditional mineral insulating oils, including safety, environmental friendliness, oral non-toxicity, renewable nature, and low carbon emissions. Research on natural ester insulating oil began relatively early abroad, establishing relevant technologies and standards. Natural ester insulating oil has been successfully applied to power transformers operating at high voltages of 220 kV and above, with even greater application in distribution transformers. Currently, over 1.2 million transformers worldwide use natural ester insulating oil produced abroad. Over the past decade, major domestic universities, research institutes, and enterprises have conducted research on natural ester insulating oil and established industry standards for it. Natural ester insulating oil has also been widely used in 10 kV and 35 kV distribution transformers, performing well.

[0003] Decolorization methods are categorized into physical and chemical methods. Physical methods primarily include adsorption, extraction, and ion exchange, while chemical methods primarily include oxidation, reduction, and hydrogenation. Currently, adsorption decolorization is the most widely used method in the preparation of natural ester insulating oil. Although the primary components of vegetable oils are triglycerides of fatty acids, and the primary pigments in vegetable oils are chlorophyll and carotenoids, different vegetable oils contain different pigments. Therefore, conventional adsorption decolorization processes for producing natural ester insulating oils from vegetable oils make it difficult to achieve the color standards required for natural ester insulating oils.

[0004] Oil decolorization tanks are crucial equipment in the oil refining process. Currently, enclosed decolorization equipment primarily utilizes negative pressure to achieve agitation and decolorization, primarily using a bottom-inlet, top-outlet type. This type of equipment offers advantages such as air isolation and a 65% tank utilization rate. However, it suffers from limitations in terms of adjustable settings, primarily requiring a filter to obtain a decolorized oil sample. Summary of the Invention

[0005] In view of this, in order to solve the technical problems of oil decolorization in the prior art, the present disclosure provides an oil decolorization device and an oil decolorization method.

[0006] According to a first aspect of an embodiment of the present disclosure, there is provided a grease decolorization device, the grease decolorization device comprising a decolorization tank, a baffle, and a multi-layer partition;

[0007] The partition is located in the decolorization tank and is fixedly connected to the inner wall of the decolorization tank. The partition is used to place decolorization supplies, which are used to decolorize grease.

[0008] The baffle is located in the decolorization tank body and is fixedly connected to the inner wall of the decolorization tank body. The top of the decolorization tank body is provided with an oil inlet, and the baffle is located between the partition and the oil inlet of the decolorization tank body;

[0009] The grease decolorization equipment further includes a flow rate control mechanism, which is configured to transport the grease to be decolorized from the oil inlet into the decolorization tank at a set flow rate.

[0010] In an optional embodiment, the flow rate control mechanism includes an oil pump, a flow rate monitoring device and a control device, and the oil pump and the flow rate monitoring device are both electrically connected to the control device;

[0011] The oil pump is connected to the oil inlet and is used to pump the grease to be decolorized into the decolorization tank;

[0012] The flow rate monitoring device is provided on the oil inlet pipeline between the oil pump and the oil inlet, and is used to monitor the flow rate of the grease to be decolorized in the oil inlet pipeline;

[0013] The control device is configured to control the oil pump based on the flow rate monitored by the flow rate monitoring device to transport the grease to be decolorized from the oil inlet into the decolorization tank at a set flow rate.

[0014] In an optional embodiment, the grease decolorization equipment includes an electrical performance detection device and an oil storage tank, and an oil outlet is provided at the bottom of the decolorization tank body, and the oil outlet is connected to the oil storage tank through an oil outlet pipe;

[0015] The electrical performance detection device is configured to detect the electrical performance of the grease in the oil storage tank and output a prompt message when it is detected that the electrical performance does not meet the standard; the prompt message is used to remind the user to replace the decolorizing product.

[0016] In an optional embodiment, the grease decolorization equipment includes a first heating circulation heat conduction pipe, which is arranged around the inner wall of the decolorization tank and fixedly connected to the inner wall of the decolorization tank.

[0017] In an optional embodiment, the grease decolorization device includes a plurality of second heating circulation heat conducting pipes, which are respectively arranged below the multiple layers of the partitions and abut against the corresponding partitions;

[0018] The second heating circulation heat conducting pipe is arranged along the circumference of the decolorization tank body and is fixedly connected to the inner wall of the decolorization tank body.

[0019] In an optional embodiment, the first heating cycle heat conducting pipe and the second heating cycle heat conducting pipe are connected to each other.

[0020] In an optional embodiment, an air inlet is provided on the top of the decolorization tank, and the air inlet is used to transport inert gas into the decolorization tank;

[0021] The air inlet is connected to an air intake pipe, and an air intake control valve is provided on the air intake pipe.

[0022] In an optional embodiment, a plurality of material changing ports corresponding one to one with the multiple layers of the partitions are provided on the side wall of the decolorization tank, and the material changing ports are used to replace the decolorization supplies corresponding to the partitions.

[0023] In an optional embodiment, the decolorizing product includes at least white clay and activated carbon.

[0024] According to a second aspect of an embodiment of the present disclosure, a method for decolorizing oil is provided. The method decolorizes the oil to be decolorized by using the oil decolorization device according to any one of the first aspects. The method comprises:

[0025] Inputting hot water of a set temperature into the first heating circulation heat conducting pipe and the second heating circulation heat conducting pipe of the grease decolorization equipment; wherein the set temperature is greater than or equal to 70° C. and less than or equal to 90° C.;

[0026] The grease to be decolorized is transported into the decolorization tank of the grease decolorization equipment at a set flow rate, so that the grease to be decolorized flows evenly to the multi-layer partition after passing through the baffle;

[0027] When the grease to be decolorized is no longer supplied to the decolorization tank, inert gas is supplied to the decolorization tank through the air inlet to squeeze out the remaining grease in the decolorization product and discharge it from the decolorization tank.

[0028] The technical solutions provided by the embodiments of the present disclosure may include the following beneficial effects: In the present disclosure, a baffle and a multi-layer partition are provided in the decolorization tank body, the baffle being located between the multi-layer partition and the oil inlet of the decolorization tank body, and a decolorizing agent (such as bleaching clay, activated carbon, etc.) is placed on each layer of partition to decolorize the grease. The grease decolorization equipment may also include a flow rate control mechanism, which can transport the grease to be decolorized from the oil inlet into the decolorization tank body at a set speed, and then, under the action of the baffle, evenly flow to the partition on which the decolorizing agent is placed, and pass through the multi-layer partition layer by layer under the action of oil pressure to achieve continuous decolorization of the grease, and no additional filtering equipment is required to achieve adsorption decolorization of the grease, effectively improving the effect of the decolorization production process of greases such as natural ester insulating oil.

[0029] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0032] One or more embodiments are exemplarily illustrated by pictures in the corresponding drawings. These exemplifications do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements. Unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0033] Figure 1 This is a schematic diagram of a grease decolorization device according to an embodiment of the present invention;

[0034] Figure 2 Schematic cross-sectional view of a partition according to an embodiment of the present invention.

[0035] Description of reference numerals:

[0036] 1. Decolorization tank body; 2. Partition; 3. Baffle; 4. Oil inlet pipe; 5. Oil inlet control valve; 6. Air inlet pipe; 7. Air inlet control valve; 8. Oil outlet pipe; 9. Oil outlet control valve; 10. Material change port. DETAILED DESCRIPTION

[0037] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0038] The following disclosure provides many different embodiments or examples for implementing different solutions of the present invention. To simplify the disclosure of the present invention, the components and configurations of specific examples are described below. Of course, these are merely examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numbers and / or letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or configurations discussed.

[0039] For ease of description, spatially relative terms may be used herein to describe the relative position or movement of one element or feature relative to another element or feature as shown in the figures, such as "inside," "outside," "inside," "outside," "below," "beneath," "above," "above," "front," "back," and the like. Such spatially relative terms are intended to include different orientations of the device in use or operation other than the orientation depicted in the figures. For example, if the device in the figures undergoes a positional flip or a change in posture or a change in motion, then these directional indications will also change accordingly. For example, an element described as "below" or "below" another element or feature will subsequently be oriented as "above" or "above" another element or feature. Thus, the example term "below" can include both above and below orientations. The device may be oriented otherwise (rotated 90 degrees or in other orientations) and the spatially relative descriptors used herein will be interpreted accordingly.

[0040] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application. Therefore, the illustrations only show components related to the present application and are not drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component can be changed at will, and the component layout type may also be more complicated.

[0041] The following will describe the embodiments of the present application with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand the other advantages and effects of the present application from the contents disclosed in this specification. The present application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be understood that the preferred embodiments are only for the purpose of illustrating the present application and are not intended to limit the scope of protection of the present application.

[0042] In order to solve the technical problem of oil decolorization in the prior art, the present disclosure provides an oil decolorization device and an oil decolorization method.

[0043] In the present disclosure, a baffle and multi-layered partitions are disposed within the decolorization tank. The baffle is positioned between the multi-layered partition and the oil inlet of the decolorization tank, and a decolorizing agent (e.g., clay, activated carbon, etc.) is placed on each layer of the partition to decolorize the grease. The grease decolorization equipment may also include a flow rate control mechanism that can transport the grease to be decolorized from the oil inlet into the decolorization tank at a set rate. The flow rate control mechanism then flows evenly onto the partitions containing the decolorizing agent under the action of the baffles. Under the action of oil pressure, the flow passes through the multi-layered partitions layer by layer to achieve continuous decolorization of the grease. This allows adsorption decolorization of the grease to be achieved without the need for additional filtration equipment, effectively improving the decolorization production process for greases such as natural ester insulating oil.

[0044] In one exemplary embodiment, a grease decolorization device is provided. Figure 1 and Figure 2 As shown, the grease decolorization apparatus includes a decolorization tank 1, a baffle 3, and a multi-layered partition 2. The partition 2 is positioned within the decolorization tank 1 and fixedly connected to the inner wall of the decolorization tank 1. For example, the partition 2 may be welded to the inner wall of the decolorization tank 1, or fixedly connected using fasteners such as bolts or screws, without limitation.

[0045] The separator 2 is used to accommodate a decolorizing agent, which is used to decolorize grease. The decolorizing agent may include at least bleaching clay and activated carbon, but other materials capable of decolorizing grease may also be used as needed, without limitation. The multi-layer separator 2 allows for multiple, step-by-step adsorption decolorization of grease, thereby enhancing the decolorization effect.

[0046] For example, three layers of partitions 2 are arranged in order from top to bottom within the tank: the first partition 2, the second partition 2, and the third partition 2. The partitions 2 utilize a frame-filter combination structure. The partitions 2 are bolted to the inner wall of the tank. Each partition 2 has eight M12 bolt holes evenly distributed around its perimeter. During installation, rubber gaskets are installed between the partitions 2 and the inner wall of the tank to ensure a tight connection and facilitate removal and replacement. A decolorizing agent composed of 70% activated clay and 30% activated carbon is evenly packed on each layer of partition 2 to achieve optimal decolorization. It should be noted that the clay to activated carbon ratios are by mass.

[0047] The baffle 3 is located inside the bleaching tank 1 and fixedly connected to the inner wall of the bleaching tank 1. An oil inlet is provided on the top of the bleaching tank 1, and the baffle 3 is located between the partition 2 and the oil inlet of the bleaching tank 1. The baffle 3 can guide the grease to prevent the oil from falling into the partition 2 at a high speed and affecting the adsorption and decolorization effect.

[0048] For example, baffle 3 can be conical with a 120° angle, and the edge of baffle 3 can be welded to the inner wall of the tank. Multiple diversion holes can be evenly distributed on the surface of baffle 3 to evenly disperse the grease entering the tank and prevent excessive localized flow rates of the grease falling into partition 2.

[0049] The oil decolorization equipment also includes a flow rate control mechanism (not shown in the figure), which is configured to transport the oil to be decolorized from the oil inlet to the decolorization tank 1 at a set flow rate. The flow rate control mechanism can achieve precise control of the oil feed flow rate and can flexibly adjust the flow rate according to different oil properties (such as viscosity, impurity content) and production requirements to ensure operation under optimal process parameters. Compared with manual adjustment, it can better improve the accuracy of flow rate control, significantly enhance production stability, and reduce the problem of unstable product quality due to flow rate fluctuations.

[0050] The flow rate control mechanism includes an oil pump, a flow rate monitoring device, and a control device. Both the oil pump and the flow rate monitoring device are electrically connected to the control device. The oil pump is connected to the oil inlet and is used to pump the grease to be bleached into the bleaching tank 1. The oil pump receives control commands from the control device to adjust its speed, thereby controlling the grease delivery volume.

[0051] The flow rate monitoring device is provided on the oil inlet pipe 4 between the oil pump and the oil inlet, and is used to monitor the flow rate of the grease to be decolorized in the oil inlet pipe 4. For example, the flow rate monitoring device can be an electromagnetic flow meter, which can monitor the flow rate of the grease in the pipe in real time and convert the data into an electrical signal to be transmitted to the control device.

[0052] The control device is configured to control the oil pump based on the flow rate monitored by the flow rate monitoring device, so as to deliver the grease to be decolorized from the oil inlet to the decolorization tank 1 at a set flow rate. For example, the control device may include a PLC (Programmable Logic Controller) as its core, coupled with a touch screen human-machine interface. The PLC receives the flow rate signal fed back by the electromagnetic flowmeter and compares and analyzes it with a preset set flow rate. If the actual flow rate deviates from the set flow rate, the PLC changes the oil pump speed by adjusting the inverter output frequency of the oil pump motor, thereby achieving closed-loop control of the grease flow rate.

[0053] It should be noted that the design of the multi-layer partition 2 can achieve multi-level step-by-step adsorption and decolorization of grease, which can greatly improve the decolorization efficiency and effect compared to single-layer adsorption. The baffle 3 is set between the partition 2 and the oil inlet, so that the grease entering the tank body can be evenly dispersed, avoiding the problem of excessive local flow rate causing the decolorization product to be washed away or insufficiently adsorbed. In addition, the flow rate control mechanism can achieve precise control of the grease feed flow rate, and can flexibly adjust the flow rate according to different grease properties (such as viscosity, impurity content) and production requirements to ensure operation under the optimal process parameters, thereby greatly improving production stability and reducing the problem of unstable product quality caused by flow rate fluctuations. In addition, this embodiment can be suitable for the decolorization treatment of different types of natural oils and the production of natural ester insulating oils with different quality requirements by adjusting the number of partition 2 layers, the decolorization product formula and the flow rate control parameters, providing strong support for the diversified production of enterprises.

[0054] This embodiment provides a baffle 3 and multi-layer partitions 2 within the decolorization tank 1. The baffle 3 is located between the multi-layer partitions 2 and the oil inlet of the decolorization tank 1. Decolorization agents (such as clay, activated carbon, etc.) are placed on each layer of partition 2 to decolorize the grease. The grease decolorization equipment may also include a flow rate control mechanism that can transport the grease to be decolorized from the oil inlet into the decolorization tank 1 at a set speed. The flow rate control mechanism then flows evenly onto the partitions 2 containing the decolorization agents under the action of the baffle 3. Under the action of oil pressure, the grease passes through the multi-layer partitions 2 layer by layer to achieve continuous decolorization of the grease. Furthermore, adsorption decolorization of the grease can be achieved without the need for additional filtering equipment, effectively improving the decolorization production process of greases such as natural ester insulating oil.

[0055] In one exemplary embodiment, a grease decolorization device is provided. Figure 1 and Figure 2 As shown, the grease decolorization equipment includes an electrical performance testing device and an oil storage tank. The bottom of the decolorization tank 1 is provided with an oil outlet, which is connected to the oil storage tank via an oil outlet pipe 8. An electric valve is installed on the oil outlet pipe 8, which can be remotely controlled. The decolorization tank 1 can discharge the decolorized grease into the oil storage tank through the oil outlet and oil outlet pipe 8.

[0056] The electrical performance detection device is configured to detect the electrical properties of the oil in the oil storage tank and output a prompt message if the electrical properties are not up to standard. The prompt message is used to remind the user to replace the decolorizing agent. In other words, this embodiment can determine whether the decolorizing agent, such as the clay and activated carbon, in the partition 2 needs to be replaced based on the electrical properties of the oil sample in the oil storage tank.

[0057] For example, an electrical performance testing device might consist of a dielectric constant tester, a volume resistivity tester, and a data processing module. The dielectric constant tester and volume resistivity tester, installed inside the oil storage tank, measure the dielectric constant and volume resistivity of the oil, respectively. The data processing module, built on a processor, receives the tester data and compares it with preset standard values. If the test value falls below the standard, the data processing module controls the flashing of an alarm indicator, sounds an alarm through a buzzer, and displays a message on the touchscreen stating, "Oil electrical performance does not meet standards. Please replace the decolorizer."

[0058] In addition, in the grease decolorization equipment, a plurality of material replacement ports 10 corresponding to the multiple layers of the partitions 2 are provided on the side wall of the decolorization tank 1 , and the material replacement ports 10 are used to replace the decolorization supplies corresponding to the partitions 2 .

[0059] For example, the decolorization tank body 1 can be cylindrical, and its side wall can be provided with three layers of material changing ports 10 along the height direction (i.e., the axial direction), which correspond one to one with the positions of the three layers of partitions 2 respectively. The material changing ports 10 can be circular and can adopt a quick-opening flange structure and be equipped with a sealing rubber ring and a butterfly valve for easy quick opening and sealing.

[0060] In this embodiment, the electrical performance detection device can monitor key electrical performance indicators such as the dielectric constant and volume resistivity of the oil in the oil storage tank in real time and continuously. Compared with the traditional random inspection method, the detection frequency is greatly improved, and oil quality problems caused by incomplete decolorization or failure of the adsorbent can be discovered in time. When it is detected that the electrical performance is not up to standard, the equipment will clearly prompt to replace the decolorization supplies and accurately locate the source of the problem. It avoids the waste of time caused by blindly checking other equipment components, while reducing unnecessary equipment disassembly and maintenance costs, and extending the overall service life of the equipment. Moreover, by promptly prompting to replace the decolorization supplies, the deterioration of the oil decolorization effect due to excessive saturation of the adsorbent is prevented, and production interruptions caused by product quality problems are avoided. Compared with equipment not equipped with this detection device, it can better improve production continuity and effectively improve the production efficiency and economic benefits of the enterprise.

[0061] In one exemplary embodiment, a grease decolorization device is provided. Figure 1 and Figure 2As shown, the grease decolorization equipment may include a first heating circulation heat conducting pipe, which is arranged around the inner wall of the decolorization tank body 1 and fixedly connected to the inner wall of the decolorization tank body 1.

[0062] The grease decolorization apparatus includes multiple second heating circulation heat pipes, each disposed beneath the multiple layers of the baffles 2 and abutting the corresponding baffles 2. The second heating circulation heat pipes are arranged circumferentially around the bleaching tank 1 and are fixedly connected to the inner wall of the bleaching tank 1. For example, the second heating circulation heat pipes are tightly abutted against the bottom surface of the baffles 2 and secured to the inner wall of the tank via U-shaped clamps.

[0063] The first heating circulation heat conducting pipe and the second heating circulation heat conducting pipe are connected to each other. For example, the first heating circulation heat conducting pipe and the second heating circulation heat conducting pipe are connected to each other through an elbow and a tee pipe to form a closed circulation system.

[0064] In this embodiment, a comprehensive heating system is formed by a first heating circulation heat pipe surrounding the inner wall of the decolorization tank 1 and a second heating circulation heat pipe below the partition 2. This system can precisely control the decolorization process temperature within a suitable temperature range (e.g., around 80°C), effectively avoiding the problem of poor decolorization results due to localized low temperatures. Furthermore, the appropriate temperature environment can reduce the viscosity of oils and fats, increase the oil's penetration rate and diffusion coefficient in the decolorization product, and fully utilize the adsorption properties of decolorization products such as clay and activated carbon, thereby improving the decolorization effect. Furthermore, uniform and stable heating prevents adsorbent aging and failure caused by localized high temperatures, reducing replacement frequency and lowering production costs.

[0065] This embodiment can adapt to the decolorization requirements of different types of oils and fats by adjusting the heating temperature, meeting diverse production needs. When the first and second heating circulation heat pipes are interconnected, they form a closed circulation system, reducing heat loss. Furthermore, this oil decolorization equipment utilizes intelligent temperature control technology to automatically adjust the heating power based on actual needs, further reducing energy consumption.

[0066] In one exemplary embodiment, a grease decolorization device is provided. Figure 1 and Figure 2 As shown, the top of the oil decolorization apparatus is provided with an air inlet for delivering inert gas into the decolorization tank 1. The specific type of inert gas can be selected based on actual needs and is not limited thereto. The air inlet is connected to an air inlet pipe 6, which is provided with an air inlet control valve 7 to facilitate control of the inert gas delivery. It should be noted that the air inlet and the oil inlet can share the same inlet or have separate inlets, which is not limited thereto.

[0067] Among them, when the air intake control valve 7 is opened, inert gas can be filled into the decolorization tank body 1 through the air intake pipe 6, so that the inert gas maintains a certain pressure in the decolorization tank body 1, so that the residual oil sample in the decolorization tank body 1 is separated from the decolorization product composed of the mixed solid of white clay and activated carbon as much as possible. After the oil sample in the decolorization tank body 1 is emptied, if necessary, the mixed solid of white clay and activated carbon in the partition 2 can be replaced.

[0068] In this embodiment, by filling the decolorization tank 1 with inert gas and utilizing gas pressure to squeeze out the oil sample remaining in the decolorization product, this method effectively improves emptying efficiency compared to traditional gravity-based natural emptying methods, reduces the amount of oil sample remaining in the decolorization product, lowers oil sample loss, improves raw material utilization, and reduces production costs. Furthermore, after the inert gas-assisted emptying of the residual oil sample, the decolorization product on the partition 2 is in a dry and loose state, making it easier to clean and replace. This significantly improves equipment maintenance efficiency, reduces downtime, and enhances production continuity. Furthermore, this embodiment reduces the soaking and contamination of the decolorization product by the residual oil sample, prevents impurities and oxidation products in the oil sample from reducing the adsorption properties of the clay and activated carbon, effectively extending the service life of the decolorization product and further reducing production costs.

[0069] In an exemplary embodiment, a grease decolorization device and a grease decolorization method are provided. The grease decolorization method can decolorize the grease to be decolorized using the grease decolorization device.

[0070] Among them, reference Figure 1 and Figure 2 As shown, the top of the bleaching tank 1 may be provided with an oil inlet and an air inlet. An oil inlet control valve 5 is provided on an oil inlet pipe 4 connected to the oil inlet to facilitate oil control. Furthermore, an air inlet control valve 7 is provided on an air inlet pipe 6 connected to the air inlet to facilitate air control. Both the oil inlet control valve 5 and the air inlet control valve 7 may be electronically controlled valves to facilitate remote control.

[0071] The sidewall of the bleaching tank 1 is provided with a plurality of material exchange ports 10, which facilitate the entry and exit of the bleaching material, a mixture of clay and activated carbon, thereby facilitating the replacement of the bleaching material. An oil outlet can be provided at the bottom of the bleaching tank 1, and an oil outlet control valve 9 is provided on an oil outlet pipe 8 connected to the oil outlet to facilitate oil output control.

[0072] In the grease dragging equipment, vegetable oil can be introduced into the bleaching tank 1 from the top at a set flow rate. When the oil is continuously pumped, a certain pressure will be applied to the vegetable oil in the bleaching tank 1. Under pressure, the vegetable oil passes through the partition 2 filled with white clay and activated carbon.

[0073] The decolorization tank 1 is equipped with multiple partitions 2, each filled with a mixture of clay and activated carbon, enabling long-term, continuous decolorization. As the vegetable oil passes through the partitions 2, the clay and activated carbon absorb pigments and impurities in the oil, achieving the desired decolorization effect. The oil then passes through the partitions 2 of the current layer and enters the partitions 2 of the next layer, and so on, until it passes through the bottom layer of partitions 2. Finally, the decolorized oil can enter the oil storage tank through the oil outlet at the bottom of the decolorization tank 1.

[0074] In this embodiment, it can be determined whether the clay and activated carbon in the partition 2 need to be replaced based on the electrical properties of the oil sample (i.e., the decolorized grease) in the oil storage tank to ensure the decolorization effect.

[0075] The bleaching tank 1 can be cylindrical with a radius of r (m). A first heating circulation pipe and a second heating circulation pipe are installed on the inner wall of the bleaching tank 1, surrounding and interconnected. The second heating circulation pipe is located below the partition 2 containing clay and activated carbon. The second heating circulation pipe not only heats the activated carbon and clay in the partition 2 but also supports the partition 2 to enhance its stability. The first and second heating circulation pipes heat the oil sample entering the bleaching tank 1, accelerating the passage of the vegetable oil through the partition 2 containing clay and activated carbon.

[0076] The inlet at the top of the bleaching tank 1 is used to input inert gas. When the inert gas inlet valve is opened, the inert gas can be filled into the bleaching tank 1, maintaining a certain pressure in the bleaching tank 1 to minimize the separation of the residual oil sample from the clay and activated carbon solid mixture. After the oil sample in the bleaching tank 1 is emptied, the clay and activated carbon solid mixture inside the partition 2 can be replaced.

[0077] In this embodiment, conventional refining processes for vegetable oil, including bleaching, alkali refining, and deodorization, can be performed to produce a natural ester insulating oil base. The oil decolorization equipment and method of this embodiment can be employed for decolorization. Hot water at a set temperature can be continuously injected into the first and second heating circulation heat pipes in the decolorization tank 1 to heat the partition 2 and the vegetable oil entering the decolorization tank 1. The set temperature is greater than or equal to 70°C and less than or equal to 90°C. For example, the hot water temperature can be 80°C.

[0078] In this case, the grease to be decolorized is transported into the decolorization tank 1 of the grease decolorization equipment at a set flow rate so that the grease to be decolorized flows evenly to the multi-layer partitions 2 after passing through the baffles 3. In the case of continuous oil injection, the oil sample passes through the partitions 2 filled with white clay and activated carbon, passes through the upper partition 2, and then enters the next partition 2. Finally, the oil sample enters the oil storage tank through the oil outlet at the bottom of the decolorization tank 1.

[0079] When the grease to be decolorized is no longer supplied to the decolorization tank 1, inert gas is supplied to the decolorization tank 1 through the air inlet to squeeze out the remaining grease in the decolorization product through the inert gas and discharge it from the decolorization tank 1 to the oil storage tank.

[0080] After bleaching, the bleached oil sample is alkali-refined in an alkali refining facility. The refined oil sample is then deodorized to produce a base oil sample for the natural ester insulating oil. The base oil sample is then transferred to a reaction mixer and heated to 75±5°C. An antioxidant is added at a concentration of 0.2-0.7% by weight of the oil. The vacuum is maintained at 20-50 mmHg, and stirring is continued for 4 hours to produce the natural ester insulating oil.

[0081] The antioxidant may be one or both of tert-butylhydroquinone (TBHQ) and 2,6-di-tert-butyl-p-cresol (BHT), without limitation.

[0082] The grease decolorization equipment and method of this embodiment use natural grease as raw material to prepare insulating oil, enabling sustainable production and use of insulating oil. Furthermore, this embodiment can effectively improve efficiency during the production of natural ester insulating oil and reduce oil sample loss. This addresses the current situation where conventional processes are unable to achieve continuous decolorization production, improving production process efficiency and effectively enhancing the effectiveness of the natural ester insulating oil decolorization production process. This embodiment utilizes continuous production and the combined use of bleaching clay and activated carbon, which can improve the efficiency of the use of bleaching clay and activated carbon, effectively increasing the dielectric loss and volume resistivity of natural ester insulating oil during the decolorization production process.

[0083] The grease decolorization equipment and method of this embodiment are to allow a certain flow rate of vegetable oil to enter the tank through a pipeline controlled by a feed valve at the top of the tank. Under the action of a baffle 3, the oil sample flows evenly onto a partition 2 filled with bleaching clay and activated carbon. Under the pressure of the pump oil, the oil sample passes through the partition 2 filled with bleaching clay and activated carbon, enters the next layer of partition 2 through the partition 2, and finally enters the oil storage tank through the oil outlet below the tank. The amount of bleaching clay and activated carbon in the partition 2 is much higher than that required for a conventional single decolorization reaction. Moreover, the presence of multiple partitions 2 in the tank allows for continuous decolorization without the need for supporting filtering equipment. After the vegetable oil decolorization is completed, an inert gas is injected from the top of the tank. As the inert gas is injected, the residual vegetable oil is pressed out of the bleaching clay and activated carbon in the partition 2. The oil sample passes through the partition 2 under a certain pressure, which can improve the utilization rate of the bleaching clay and activated carbon and reduce the loss rate of the oil sample.

[0084] It should be understood that the terms used herein are for the purpose of describing specific example embodiments only and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "comprise", "include", "contain" and "have" are inclusive and therefore specify the presence of stated features, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the specific order described or illustrated, unless the order of execution is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0085] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates otherwise, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0086] The foregoing description is intended only to provide specific embodiments of the present invention, which will enable those skilled in the art to understand and implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not intended to be limited to the embodiments shown herein, but is intended to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A grease decolorization device, characterized in that: The grease decolorization equipment includes a decolorization tank, a baffle and a multi-layer partition; The partition is located in the decolorization tank and is fixedly connected to the inner wall of the decolorization tank. The partition is used to place decolorization supplies, which are used to decolorize grease. The baffle is located in the decolorization tank body and is fixedly connected to the inner wall of the decolorization tank body. The top of the decolorization tank body is provided with an oil inlet, and the baffle is located between the partition and the oil inlet of the decolorization tank body; The grease decolorization equipment further includes a flow rate control mechanism, which is configured to transport the grease to be decolorized from the oil inlet into the decolorization tank at a set flow rate.

2. The grease decolorization equipment according to claim 1, characterized in that: The flow rate control mechanism includes an oil pump, a flow rate monitoring device and a control device, and the oil pump and the flow rate monitoring device are both electrically connected to the control device; The oil pump is connected to the oil inlet and is used to pump the grease to be decolorized into the decolorization tank; The flow rate monitoring device is provided on the oil inlet pipeline between the oil pump and the oil inlet, and is used to monitor the flow rate of the grease to be decolorized in the oil inlet pipeline; The control device is configured to control the oil pump based on the flow rate monitored by the flow rate monitoring device to transport the grease to be decolorized from the oil inlet into the decolorization tank at a set flow rate.

3. The grease decolorization equipment according to claim 1, characterized in that: The grease decolorization equipment includes an electrical performance detection device and an oil storage tank. The bottom of the decolorization tank is provided with an oil outlet, and the oil outlet is connected to the oil storage tank through an oil outlet pipe. The electrical performance detection device is configured to detect the electrical performance of the grease in the oil storage tank and output a prompt message when it is detected that the electrical performance does not meet the standard; the prompt message is used to remind the user to replace the decolorizing product.

4. The grease decolorization equipment according to claim 1, characterized in that: The grease decolorization equipment includes a first heating circulation heat conduction pipe, which is arranged around the inner wall of the decolorization tank and fixedly connected to the inner wall of the decolorization tank.

5. The grease decolorization equipment according to claim 4, characterized in that: The grease decolorization equipment includes a plurality of second heating circulation heat conducting pipes, which are respectively arranged below the multiple layers of the partitions and abut against the corresponding partitions; The second heating circulation heat conducting pipe is arranged along the circumference of the decolorization tank body and is fixedly connected to the inner wall of the decolorization tank body.

6. The grease decolorization equipment according to claim 5, characterized in that: The first heating cycle heat conduction pipe and the second heating cycle heat conduction pipe are communicated with each other.

7. The grease decolorization equipment according to claim 1, characterized in that: The top of the decolorization tank is provided with an air inlet, and the air inlet is used to transport inert gas into the decolorization tank; The air inlet is connected to an air intake pipe, and an air intake control valve is provided on the air intake pipe.

8. The grease decolorization equipment according to claim 1, characterized in that: A plurality of material changing ports corresponding to the multiple layers of the partitions are provided on the side wall of the decolorizing tank, and the material changing ports are used to replace the decolorizing supplies corresponding to the partitions.

9. The grease decolorization equipment according to any one of claims 1 to 8, characterized in that: The decolorizing product at least comprises white clay and activated carbon.

10. A method for decolorizing oil, characterized in that: The grease decolorization method is to decolorize the grease to be decolorized by the grease decolorization device according to any one of claims 1 to 9, and the grease decolorization method comprises: Inputting hot water of a set temperature into the first heating circulation heat conducting pipe and the second heating circulation heat conducting pipe of the grease decolorization equipment; wherein the set temperature is greater than or equal to 70° C. and less than or equal to 90° C.; The grease to be decolorized is transported into the decolorization tank of the grease decolorization equipment at a set flow rate, so that the grease to be decolorized flows evenly to the multi-layer partition after passing through the baffle; When the grease to be decolorized is no longer supplied to the decolorization tank, inert gas is supplied to the decolorization tank through the air inlet to squeeze out the remaining grease in the decolorization product and discharge it from the decolorization tank.

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