Frying waste oil treatment system and frying waste oil treatment process

Abstract

The application discloses a frying waste oil treatment system and a frying waste oil treatment process. The frying waste oil treatment system comprises an oven, the inside of the oven is formed with a containing space for placing solidified frying waste oil, the bottom of the containing space is provided with a filter screen; a first heating assembly is used for heating and melting the solidified frying waste oil into liquid frying waste oil; a settling tank is arranged below the oven and is used for containing the liquid frying waste oil flowing from the oven, the top of the settling tank is provided with an oil inlet, and the oil inlet is communicated with the containing space through the filter holes on the filter screen; and a second heating assembly is used for heating the liquid frying waste oil to a preset settling temperature, so that the liquid frying waste oil forms purified oil after standing and settling. The frying waste oil treatment system and the frying waste oil treatment process have the advantages of low energy consumption, high economy and reduced frying waste oil grease loss.

Description

Technical Field

[0001] This invention relates to the field of frying oil technology, and more specifically to a frying waste oil treatment system and a frying waste oil treatment process. Background Technology

[0002] Waste cooking oil includes frying waste oil and swill oil from the grease traps in the sewers of restaurants or eateries. Among them, frying waste oil refers to the waste edible oil produced by catering establishments that mainly use frying for cooking. It comes from the frying process in the catering industry and has carcinogenic fatty acid polymers after repeated high-temperature frying. Currently, the treatment of waste frying oil is generally included in gutter oil treatment projects. This involves pouring the waste frying oil into the gutter oil inlet, heating it while it's still solidified, then passing it through a waste oil system's impurity removal and sand removal systems to remove minor impurities. The oil is then heated and homogenized in a cooking tank, and finally centrifuged using a three-phase separator to obtain crude frying oil. However, because the oil content of waste frying oil is much higher than that of swill oil, this treatment method requires redundant steps such as impurity removal, sand removal, and centrifugation (while swill oil contains many impurities, requiring these steps). These redundant steps result in significant oil loss, higher costs, and unnecessary energy consumption. Summary of the Invention

[0003] The purpose of this invention is to provide a frying waste oil treatment system, which has the advantages of simple structure, low energy consumption, high economy, and reduced oil loss from frying waste oil.

[0004] To achieve the above objectives, a first aspect of the present invention provides a frying waste oil treatment system, the frying waste oil treatment system comprising:

[0005] The oven has an interior space for holding solidified waste frying oil, and a filter screen is installed at the bottom of the space.

[0006] The first heating component is used to heat and melt solidified waste frying oil into liquid waste frying oil;

[0007] A settling tank is located below the oven and is used to hold the liquid frying waste oil flowing in from the oven. The top of the settling tank is equipped with an oil inlet, which is connected to the holding space through the filter holes on the filter screen.

[0008] The second heating component is used to heat the liquid frying waste oil to a preset settling temperature so that the liquid frying waste oil can be purified into oil after settling.

[0009] In an embodiment of the present invention, a reflux outlet is formed at the bottom of the settling tank, and the frying waste oil treatment system further includes a reflux component, which includes a reflux pipe and a reflux pump. The two ends of the reflux pipe are respectively connected to a reflux outlet and a reflux inlet, and the reflux pump is installed on the reflux pipe.

[0010] In an embodiment of the present invention, the bottom of the settling tank is provided with an oil outlet, and the frying waste oil treatment system also includes an oil conveying pipe and a recovery tank. The two ends of the oil conveying pipe are respectively connected to the oil outlet and the recovery tank, and the recovery tank is used to store purified oil.

[0011] In an embodiment of the present invention, the oven includes an inner box and an outer box, a accommodating space is formed inside the inner box, a sandwich cavity is formed between the inner box and the outer box, a first heating component is disposed in the sandwich cavity and can heat the air in the sandwich cavity, and an air outlet is formed on the side wall of the inner box for allowing the heated air to flow out.

[0012] In an embodiment of the present invention, an air inlet is provided on the top wall of the inner box, and the frying waste oil treatment system also includes a fan disposed in the interlayer cavity and used to draw air from the containment space into the interlayer cavity, and an air duct is formed between the air outlet end of the fan and the air outlet hole.

[0013] In an embodiment of the present invention, the oven further includes an insulation layer disposed on the outside of the outer casing.

[0014] In an embodiment of the present invention, the frying waste oil treatment system further includes a steam source, and the second heating component includes a steam conveying pipe, one end of which is connected to the steam source, and the other end of which extends into the liquid frying waste oil.

[0015] In an embodiment of the present invention, the second heating assembly further includes a steam heating pipe connected to a steam source. The steam heating pipe is disposed on the outer wall of the settling tank and can directly heat the side wall of the settling tank.

[0016] In an embodiment of the present invention, a breather valve is provided on the top of the settling tank for balancing the internal air pressure and the external air pressure of the settling tank.

[0017] In an embodiment of the present invention, the frying waste oil treatment system further includes multiple oil drums for containing solidified frying waste oil and a transport component for transporting the oil drums to the containing space.

[0018] In an embodiment of the present invention, the frying waste oil treatment system further includes a first temperature detector and a controller. The first temperature detector is used to detect the temperature of the liquid frying waste oil. The controller is communicatively connected to the first temperature detector and the reflux pump and is configured to:

[0019] Confirm that the second heating component is in operation;

[0020] Ensure the return pump is operational;

[0021] Determine that the temperature of the liquid frying waste oil reaches the first preset temperature.

[0022] Control the second heating component to stop working;

[0023] The reflux pump is stopped so that the liquid frying waste oil can settle and form purified oil after a preset time.

[0024] In an embodiment of the present invention, the bottom of the settling tank is provided with a slag outlet, and the frying waste oil treatment system also includes a settling debris conveying pipe and a first output pump for conveying the settling debris formed after settling in the containment cavity. The first output pump is installed on the settling debris conveying pipe.

[0025] In an embodiment of the present invention, a second output pump is provided on the oil pipeline. The second output pump, the first output pump, and the controller are communicatively connected to control the return pump to stop working, so that the liquid frying waste oil can be allowed to settle and settle for a preset time to form purified oil, including:

[0026] After the control reflux pump stops working for a preset time, the control first output pump is turned on to output the settled debris that has settled in the containment chamber and is located below the purified oil.

[0027] After the sedimented impurities are discharged, the first output pump is turned off and the second output pump is turned on to deliver the purified oil to the recovery tank.

[0028] In an embodiment of the present invention, the frying waste oil treatment system further includes a second temperature detector disposed in the containment space and used to detect the temperature of the air in the containment space. The second temperature detector, the first heating component, and the controller are communicatively connected. The controller is further configured to:

[0029] Confirm that the first heating component is in working condition;

[0030] Ensure that the air temperature in the containment space reaches the preset temperature;

[0031] Control the first heating component to stop working.

[0032] A second aspect of the present invention provides a process for treating waste frying oil, the process comprising:

[0033] First heating operation: heating and melting solidified waste frying oil into liquid waste frying oil;

[0034] Filtration operation: The liquid frying waste oil is filtered to form filtered liquid frying waste oil;

[0035] Second heating operation: Heat the filtered liquid frying waste oil to the preset settling temperature;

[0036] Sedimentation process: The liquid frying waste oil, which has reached the preset sedimentation temperature, is allowed to settle for a preset time to form purified oil and sediment in layers.

[0037] Separation operation: Separate the purified oil from the upper layer to obtain purified oil.

[0038] In embodiments of the present invention, the waste frying oil treatment process further includes a hydraulic stirring operation performed simultaneously with the second heating operation, the hydraulic stirring operation including:

[0039] A settling tank and a reflux assembly are used for hydraulic stirring. The filtered liquid frying waste oil is loaded into the settling tank, and the reflux assembly is turned on so that the liquid frying waste oil at the bottom of the settling tank is extracted and re-input from the top of the settling tank, thereby realizing the reflux circulation of liquid frying waste oil in the settling tank.

[0040] As shown in the above technical solution, the frying waste oil treatment system includes an oven, a first heating component, a settling tank, and a second heating component. The oven has an internal space for holding solidified frying waste oil, and a filter screen is installed at the bottom of this space. The first heating component heats and melts the solidified frying waste oil into liquid frying waste oil. The settling tank is located below the oven and holds the liquid frying waste oil flowing in from it. An oil inlet is located at the top of the settling tank, and it connects to the settling space through filter holes on the filter screen. The second heating component heats the liquid frying waste oil to a preset settling temperature, allowing it to settle and form purified oil. This frying waste oil treatment system eliminates the need for a sand removal system, a impurity removal system, and a separator, resulting in a simpler structure. It avoids redundant steps such as sand removal, impurity removal, and centrifugation, thus preventing unnecessary energy loss, increasing economic efficiency, and reducing oil loss from the frying waste oil. Attached Figure Description

[0041] The accompanying drawings are provided to further illustrate embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. In the drawings:

[0042] Figure 1 This is the first structural form of the frying waste oil treatment system in the embodiments of the present invention (no purified oil and settled impurities in the settling tank).

[0043] Figure 2 This is the first structural form of the frying waste oil treatment system in the embodiments of the present invention (the settling tank contains purified oil and settling debris).

[0044] Figure 3 This is the second structural form of the frying waste oil treatment system in the embodiments of the present invention;

[0045] Figure 4This is the structural form of the settling tank in the embodiments of the present invention;

[0046] Figure 5 This is a top view of the interior of the oven in an embodiment of the present invention;

[0047] Figure 6 This is the process flow for treating waste frying oil in this embodiment of the invention.

[0048] Explanation of reference numerals in the attached figures

[0049] 1-Oven; 101-Inner chamber; 102-Outer chamber; 103-Jackport; 104-Air duct; 2-First heating assembly; 3-Settling tank; 301-Oil inlet; 302-Oil outlet; 303-Slag outlet; 304-Return oil inlet; 4-Second heating assembly; 401-Steam conveying pipe; 402-Steam heating pipe; 5-Recovery assembly; 501-Oil delivery pipe; 6-Return pipe; 7 - Fan; 8- Insulation layer; 9- Breathing valve; 10- Transport component; 1001- Trolley track; 1002- Trolley; 1003- Hook slide rail; 1004- Hook; 11- Second output pump; 12- First output pump; 13- Settled debris conveying pipe; 14- Flow regulating valve; 15- Purified oil; 16- Settled debris; 17- Transition component; 18- Oil drum; 19- Observation window; 20- Ladder. Detailed Implementation

[0050] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of the present invention.

[0051] An embodiment of the present invention provides a frying waste oil treatment system, such as... Figure 1-3 As shown, the frying waste oil treatment system includes:

[0052] Oven 1, the interior of oven 1 is formed with a container for holding solidified frying waste oil, and a filter screen is provided at the bottom of the container;

[0053] The first heating component 2 is used to heat and melt solidified waste frying oil into liquid waste frying oil;

[0054] Settling tank 3 is located below oven 1 and is used to contain liquid frying waste oil flowing from oven 1. The top of settling tank 3 is provided with oil inlet 301, which is connected to the containing space through the filter holes on the filter screen.

[0055] The second heating component 4 is used to heat the liquid frying waste oil to a preset settling temperature so that the liquid frying waste oil can be purified into purified oil after settling.

[0056] Specifically, the frying waste oil in this embodiment has a high content of animal fat, specifically over 70%, and solidifies at low temperatures, resulting in poor flowability. The solidified frying waste oil is placed on a filter screen within the containment space. When processing is required, the first heating component 2 is activated to heat the solidified frying waste oil. The heated and melted solidified frying waste oil becomes liquid frying waste oil and flows through the filter holes on the filter screen to the oil inlet 301 at the top of the settling tank 3. The settling tank 3 has an internal containment cavity connected to the oil inlet 301, which contains the liquid frying waste oil flowing in from the oil inlet 301. During this process, after filtration by the filter screen, larger volume impurities contained in the solidified frying waste oil remain in the containment space. Operators can use cleaning tools (such as brooms, dustpans, etc.) to clean these remaining impurities. The second heating component 4 can further heat the liquid frying waste oil in the receiving cavity until it reaches a preset settling temperature, wherein the preset settling temperature ranges from 75℃ to 95℃. In this embodiment, the preset settling temperature is preferably 90℃. Due to the higher preset settling temperature, the viscosity of the frying waste oil decreases at this temperature. After a preset settling time, the sedimented impurities 16 (such as water and slag) and purified oil 15 in the liquid frying waste oil will naturally separate into layers. The sedimented impurities 16 settle to the bottom of the receiving cavity, and the purified oil 15 is located above the sedimented impurities 16.

[0057] Compared to existing technologies, the frying waste oil treatment system in this embodiment does not include a sand removal system, a dirt removal system, or a separator. Its structure is simpler, and it eliminates redundant steps such as sand removal, dirt removal, and centrifugation. Figure 6 As shown in the figure, it does not cause unnecessary energy loss, is more economical, and also reduces the oil loss of frying waste oil.

[0058] In one embodiment of the present invention, the frying waste oil treatment system further includes a transition member 17 disposed between the filter screen and the settling tank 3. The top of the transition member 17 is provided with an inlet communicating with the filter holes, and the bottom of the transition member 17 is provided with an outlet communicating with the oil inlet 301 of the settling tank 3. The melted frying waste oil flowing out of the filter holes flows through the transition member 17 and then into the settling tank 3. Further, the transition member 17 is funnel-shaped (wider at the top and narrower at the bottom). Figure 1-2 As shown), the melted frying waste oil entering the transition piece 17 is more easily concentrated at the bottom of the transition piece 17, and then flows into the settling tank 3 from the discharge port at the bottom of the transition piece 17. In this embodiment, the number of transition pieces 17 is not limited; there can be one or more. When there are multiple transition pieces 17, the number of oil inlets 301 on the settling tank 3 also corresponds to multiple. Furthermore, in this embodiment, the transition piece 17 is not limited to a funnel shape and can be replaced with other shapes that are wider at the top and narrower at the bottom (such as...). Figure 3 (as shown in the shape).

[0059] In one embodiment of the present invention, the bottom of the settling tank 3 is provided with an oil outlet 302. The frying waste oil treatment system also includes an oil delivery pipe 501 and a recovery tank. The two ends of the oil delivery pipe 501 are respectively connected to the oil outlet 302 and the recovery tank. The recovery tank is used to store purified oil 15. Specifically, the oil delivery pipe 501 and the recovery tank together form a reflux assembly 5. After the liquid frying waste oil is settled, purified oil 15 is formed. The purified oil 15 in the settling tank 3 can be transported to the recovery tank for storage through the oil delivery pipe 501.

[0060] In one embodiment of the present invention, the diameter of the filter pores is in the range of 8mm-15mm. This range is convenient for filtering out large-volume impurities contained in solidified frying waste oil, and can effectively reduce oil loss.

[0061] In one embodiment of the present invention, a reflux outlet is formed at the bottom of the settling tank 3, and a reflux inlet 304 is formed at the top of the settling tank 3. The frying waste oil treatment system also includes a reflux assembly, which includes a reflux pipe 6 and a reflux pump. The two ends of the reflux pipe 6 are respectively connected to the reflux outlet and the reflux inlet 304, and the reflux pump is installed on the reflux pipe 6. Specifically, after the reflux pump is turned on, the liquid frying waste oil at the bottom of the settling tank 3 can be extracted. The liquid frying waste oil flowing out from the reflux outlet flows through the reflux pipe 6 and then flows into the settling tank 3 from the reflux inlet 304, realizing the reflux circulation of liquid frying waste oil. The high-speed liquid frying waste oil flows in from the top of the settling tank 3, forming a large impact, which plays a role in hydraulic stirring, improving the heating efficiency of the liquid frying waste oil, and saving space height. It is convenient to stack the oven 1 and the settling tank 3 vertically, and it is convenient for the liquid frying waste oil to flow into the settling tank 3 by gravity.

[0062] In one embodiment of the present invention, such as Figure 4 As shown, the return pipe 6 is also equipped with a flow regulating valve 14 for adjusting the flow rate of liquid frying waste oil. Adjusting the flow regulating valve 14 according to actual needs can further improve the effect of hydraulic stirring. Furthermore, the frying waste oil treatment system in this embodiment can also eliminate the components such as the return pipe 6 and the return pump, and replace them with a mechanical stirring assembly.

[0063] In one embodiment of the present invention, such as Figure 1-2As shown, the oven 1 includes an inner chamber 101 and an outer chamber 102. The accommodating space is formed inside the inner chamber 101. A sandwich cavity 103 is formed between the inner chamber 101 and the outer chamber 102. The first heating component 2 is disposed in the sandwich cavity 103 and can heat the air in the sandwich cavity 103. An air outlet is formed on the side wall of the inner chamber 101 for the heated air to flow out. Specifically, in this embodiment, the first heating component 2 includes a first steam heating pipe group and a second steam heating pipe group respectively disposed on the left and right sides of the interlayer cavity 103. Both the first and second steam heating pipe groups include multiple vertically spaced air heating pipes. The frying waste oil treatment system also includes a steam source. The aforementioned air heating pipes are connected to the steam source. Steam heating has advantages such as low cost, high heat exchange efficiency, and energy saving. Multiple air outlets are formed on both the left and right sides of the inner casing 101. The aforementioned multiple air heating pipes heat the air in the interlayer cavity 103. The heated air enters the containing space through the air outlets, raising the air temperature in the containing space and thus melting the solidified frying waste oil in the containing space. Furthermore, in this embodiment, the steam heating method can also be replaced by other heating methods such as electric heating or natural gas heating.

[0064] In one embodiment of the present invention, an air inlet is provided on the top wall of the inner casing 101. The frying waste oil treatment system also includes a fan 7 disposed in the interlayer cavity 103 and used to draw air from the containment space into the interlayer cavity 103 through the air inlet. An air duct 104 is formed between the air outlet end and the air outlet of the fan 7. Specifically, the fan 7 in this embodiment is an axial flow fan. The air inlet end of the axial flow fan faces the air inlet. After the axial flow fan is started, the air in the containment space is drawn into the interlayer cavity 103 through the air inlet, and then flows to the air outlet through the air duct 104. The air is heated by the steam heating pipe 402 during the process of flowing from the air inlet to the air outlet. The heated air then enters the containment space through the air outlet. That is, under the mutual cooperation of the axial flow fan, the air inlet, the air duct and the air outlet, the air in the containment space and the air duct (or the interlayer cavity 103) achieves thermal circulation.

[0065] In one embodiment of the present invention, the oven 1 further includes an insulation layer 8 disposed on the outside of the outer chamber 102, which can prevent the heat of the heated air in the interlayer cavity 103 from being lost rapidly.

[0066] In one embodiment of the present invention, the frying waste oil treatment system further includes a steam source, and the second heating component 4 includes a steam delivery pipe 401. One end of the steam delivery pipe 401 is connected to the steam source, and the other end of the steam delivery pipe 401 extends into the liquid frying waste oil. Specifically, the other end of the steam delivery pipe 401 passes through the side wall of the settling tank 3 and extends into the liquid frying waste oil, enabling direct delivery of steam into the liquid frying waste oil. The steam is directly injected into the frying waste oil and mixes with it to achieve direct heating. This heating method can significantly improve the heating effect of the liquid frying waste oil. Furthermore, the steam delivery pipe 401 is equipped with a first switch valve. When the operator considers the quality of the frying waste oil to be very poor, the first switch valve can be opened to use the above-mentioned heating method for the liquid frying waste oil.

[0067] In one embodiment of the present invention, the second heating assembly 4 further includes a steam heating pipe 402 connected to a steam source. The steam heating pipe 402 is disposed on the outer wall of the settling tank 3 and can directly heat the side wall of the settling tank 3. The steam heating pipe 402 first heats the side wall of the settling tank 3, and the side wall of the settling tank 3 then transfers heat to the liquid frying waste oil in the containing cavity, thereby indirectly heating the liquid frying waste oil. This heating method provides a more uniform heating effect. Furthermore, the steam delivery pipe 401 of the second heating assembly 4 is provided with a second switching valve. When the operator deems the quality of the frying waste oil to be good, the second switching valve can be opened to use the aforementioned heating method for the liquid frying waste oil. In addition, the steam heating pipe 402 in this embodiment can also be disposed on the inner wall of the settling tank 3 as needed.

[0068] In one embodiment of the present invention, the top of the settling tank 3 is provided with a breather valve 9 for balancing the internal and external air pressure of the settling tank 3. When the solidified frying waste oil in the containing space is heated and melted and flows into the closed settling tank 3, the liquid frying waste oil flowing into the settling tank 3 by gravity will occupy the internal space (i.e., the containing cavity) of the settling tank 3, resulting in positive pressure inside the settling tank 3. This will cause the passage between the containing space and the containing cavity to be blocked. Opening the breather valve 9 can balance the internal pressure of the settling tank 3 when the liquid frying waste oil flows into the settling tank 3 by gravity, so that the inside of the settling tank 3 always maintains normal pressure, ensuring that the liquid frying waste oil flows smoothly by gravity in the passage between the containing space and the containing cavity.

[0069] In one embodiment of the present invention, the frying waste oil treatment system further includes a plurality of oil drums 18 for containing solidified frying waste oil and a transport assembly 10 for transporting the oil drums 18 to the containing space. Specifically, as Figure 5As shown, the containment space can simultaneously hold multiple oil drums 18 (e.g., 20-150). After the operator transports multiple oil drums 18 containing solidified waste frying oil to the containment space via the transport component 10, the operator inverts the oil drums 18 onto the filter screen. The hot air heated by the first heating component 2 fills the entire containment space, which can simultaneously heat and melt the solidified waste frying oil in all the oil drums 18 in the containment space. The above settings enable the oven 1 to heat and melt a large amount of solidified waste frying oil in a single batch, avoiding frequent operations and greatly improving the processing efficiency of the waste frying oil treatment system.

[0070] In one embodiment of the present invention, the transport assembly 10 includes a trolley track 1001 disposed in the receiving space and a trolley 1002 movably disposed on the trolley track 1001. The trolley 1002 has an oil drum loading platform. An operator can first move an oil drum 18 containing solidified waste frying oil onto the trolley 1002, and then push the trolley 1002 along the trolley track 1001 to transport the oil drum 18 into the receiving space. The transport assembly 10 also includes a platform disposed on the top wall of the inner casing 101. The system includes a hook slide rail 1003, a hook 1004 movably mounted on the hook slide rail 1003, and a drive unit connected to the hook 1004. The oil drum 18 has a handle portion for the hook 1004 to hook onto. The operator can first hook the hook 1004 onto the handle portion of the oil drum 18, and then start the drive unit. Under the action of the drive unit, the hook 1004 and the oil drum 18 move along the hook slide rail 1003 and enter the receiving space. The installation of the transport component 10 reduces labor intensity and saves labor costs.

[0071] In one embodiment of the present invention, the frying waste oil treatment system further includes a first temperature detector and a controller. The first temperature detector is used to detect the temperature of the liquid frying waste oil. The controller is communicatively connected to the first temperature detector and the reflux pump and is configured to:

[0072] Confirm that the second heating component 4 is in working condition;

[0073] Ensure the return pump is operational;

[0074] Determine that the temperature of the liquid frying waste oil reaches the first preset temperature.

[0075] Control the second heating component 4 to stop working;

[0076] Control the return pump to stop working;

[0077] The reflux pump is stopped so that the liquid frying waste oil can be allowed to settle and form purified oil 15 after a preset time.

[0078] Specifically, after the solidified waste frying oil melts, it flows into the settling tank 3 due to its own weight. The liquid waste frying oil is heated by the second heating component 4. In order to further improve the heating effect of the liquid waste frying oil during the above process, the reflux pump is turned on, so that the waste frying oil at the bottom of the settling tank 3 is extracted. The waste frying oil flowing out from the reflux outlet flows through the reflux pipe 6 and then flows into the settling tank 3 from the reflux inlet 304. The first temperature detector is a temperature sensor installed inside the settling tank 3. When the first temperature detector detects that the temperature of the liquid waste frying oil reaches the first preset temperature, it sends a corresponding signal to the controller. After receiving the above signal, the controller controls the second heating component 4 and the reflux pump to stop working so that the liquid waste frying oil can enter the settling process. The duration of the settling process is a preset time (such as 1h-10h). After settling, purified oil 15 is formed.

[0079] In one embodiment of the present invention, the bottom of the settling tank 3 is provided with a slag outlet 303. The frying waste oil treatment system also includes a settling debris conveying pipe 13 and a first output pump 12 for conveying the settling debris 16 formed after settling in the containment cavity. The first output pump 12 is disposed on the settling debris conveying pipe 13. Specifically, the settling tank 3 includes a cylindrical column and a conical part. The slag outlet 303 and the oil outlet 302 are both disposed on the conical part, and the slag outlet 303 is located below the oil outlet 302. Since the density of water and settling debris 16 is greater than the density of purified oil 15, the water and slag in the frying waste oil after settling settle to the lowest part of the settling tank 3 (i.e., inside the conical part). When the first output pump 12 is turned on, the settling debris 16 and water formed after settling can be output through the settling debris conveying pipe 13. Furthermore, a waste cooking oil feeding bin can be set up at the downstream end of the sedimentation debris conveying pipe 13 so that the waste cooking oil can be output through the sedimentation debris conveying pipe 13 to the waste cooking oil feeding bin, and then the small amount of oil in the sedimentation debris 16 can be further extracted in the waste cooking oil treatment system, which is conducive to further reducing oil loss. Furthermore, in this embodiment, the reflux outlet and the oil outlet 302 are integrated into one unit, and the reflux pump and the first output pump 12 are integrated into one unit. When hydraulic stirring is required, the outlet of the first output pump 12 is connected to the reflux pipe 6. The frying waste oil flowing out from the reflux outlet (i.e., the oil outlet 302) enters the reflux pipe 6 under the action of the first output pump 12 (during this process, the frying waste oil passes through the sedimentation conveying pipe 13 at the upstream end of the first output pump 12), and then returns to the sedimentation tank 3 through the reflux inlet 304. When sedimentation 16 needs to be output, the outlet of the first output pump 12 is connected to the sedimentation conveying pipe 13. The sedimentation 16 flowing out from the oil outlet 302 flows into the sedimentation conveying pipe 13 and enters the waste cooking oil feeding bin under the action of the first output pump 12.

[0080] In one embodiment of the present invention, a second output pump 11 is provided on the oil pipeline. The second output pump 11, the first output pump 12, and the controller are communicatively connected to control the return pump to stop working, so that the liquid frying waste oil can be allowed to settle and settle for a preset time to form purified oil 15, including:

[0081] After the control reflux pump stops working for a preset time, the control first output pump 12 is turned on to output the settled debris 16 that has settled in the containment chamber and is located below the purified oil 15.

[0082] After the sediment 16 is discharged, the first output pump 12 is turned off and the first output pump 11 is turned on to deliver the purified oil 15 to the recovery tank.

[0083] Specifically, to avoid excessive sedimentation debris 16 after settling, which could lead to the sedimentation debris 16 being mistakenly transported to the recovery tank after the first output pump 11 is turned on, the first output pump 12 needs to be turned on first after the settling process is completed (i.e., after the reflux pump has stopped working for a preset time) so that the sedimentation debris 16 can be output first. After the sedimentation debris 16 is output, the first output pump 11 is then turned on to transport the purified oil 15 to the recovery tank. Furthermore, the settling tank 3 is equipped with a ladder 20 and a guardrail; an observation window 19 is provided on the side wall of the settling tank 3 to observe the internal conditions of the settling tank 3. The operator can clearly identify the boundary line between the settling debris 16 and the purified oil 15 through the observation window 19. If the operator observes that the settling debris 16 has been transported, he can send a control command to the controller through the touch screen or remote control, so that the controller controls the first output pump 12 to close and the first output pump 11 to open, so as to transport the purified oil 15 to the recovery tank; or, the output time of the settling debris 16 can be preset in the controller, and after the preset output time of the settling debris 16 is reached, the first output pump 12 is controlled to close and the first output pump 11 is controlled to open.

[0084] Furthermore, the settling tank 3 is equipped with an openable top cover. To prevent the first output pump 11 from running dry, the purified oil 15 will not empty the containment cavity when it is pumped out through the first output pump 11 and the oil delivery pipe 501. Therefore, the waste residue on the upper layer of the purified oil 15 will gradually accumulate. After accumulating to a certain extent, the operator can open the top cover so that the operator can manually remove the waste residue on the upper layer of the purified oil 15.

[0085] In one embodiment of the present invention, the frying waste oil treatment system further includes a second temperature detector disposed in the containment space and used to detect the temperature of the air in the containment space. The second temperature detector, the first heating component 2, and the controller are communicatively connected. The controller is further configured to:

[0086] It is confirmed that the first heating component 2 is in working condition;

[0087] Ensure that the air temperature in the containment space reaches the preset temperature;

[0088] Control the first heating component 2 to stop working.

[0089] Specifically, the second temperature detector continuously monitors the temperature of the air in the containment space. If the second temperature detector detects that the temperature of the air in the containment space reaches the preset temperature (in this embodiment, the preset temperature range is 35℃-45℃), the second temperature detector sends a corresponding signal to the controller. After receiving the above signal, the controller controls the first heating component 2 to stop working, relying on the insulation layer 8 to reduce the heat loss inside the oven 1, which is beneficial to saving energy. If, after the first heating component 2 stops working, the second temperature detector detects that the temperature of the air in the containment space is lower than the preset temperature (e.g., the air temperature is 5℃ lower than the preset temperature), the controller controls the first heating component 2 to start working. Through this setting, the purpose of automatic heating control of the first heating component 2 can be achieved, improving the automation level of the frying waste oil treatment system.

[0090] Another embodiment of the present invention provides a process for treating waste frying oil, such as... Figure 6 As shown, the frying waste oil treatment process adopts the frying waste oil treatment system in the above embodiments and includes:

[0091] First heating operation: heating and melting solidified waste frying oil into liquid waste frying oil;

[0092] Filtration operation: The liquid frying waste oil is filtered to form filtered liquid frying waste oil;

[0093] Second heating operation: Heat the filtered liquid frying waste oil to the preset settling temperature;

[0094] Sedimentation process: The liquid frying waste oil, which has reached the preset sedimentation temperature, is allowed to settle for a preset time to form purified oil and sediment in layers.

[0095] Separation operation: Separate the purified oil from the upper layer to obtain purified oil.

[0096] Specifically, inside the oven 1, solidified frying waste oil is placed on a filter screen. When the frying waste oil needs to be processed, the first heating component 2 is turned on to heat the solidified frying waste oil. After being heated and melted, the solidified frying waste oil becomes liquid frying waste oil and flows through the filter holes on the filter screen to the oil inlet 301 at the top of the settling tank 3. The settling tank 3 has a receiving cavity connected to the oil inlet 301, which is used to receive the liquid frying waste oil flowing in from the oil inlet 301. In the above process, after being filtered by the filter screen, larger volume impurities contained in the solidified frying waste oil remain in the receiving space. The operator can use cleaning tools (such as brooms, trash cans, etc.) to clean the remaining impurities. The second heating component 4 can further heat the liquid frying waste oil in the receiving cavity until it is heated to a preset settling temperature. The preset settling temperature ranges from 75℃ to 95℃. In this embodiment, the preset settling temperature is preferably 90℃. Because the preset settling temperature is relatively high, the viscosity of the frying waste oil decreases at this temperature. After a preset settling time, the sedimented impurities 16 (such as water and slag) and purified oil 15 in the liquid frying waste oil will naturally separate. The sedimented impurities 16 settle to the bottom of the receiving cavity, and the purified oil 15 is located above the sedimented impurities 16. The operator can separate the purified oil 15 and the sedimented impurities 16 by performing a separation operation to obtain the purified oil 15 separately. For example, a slag outlet 303 is set at the bottom of the settling tank 3, and an oil outlet 302 is set above the slag outlet 303. The sedimented impurities 16 are first output through the slag outlet 303, and then the purified oil 15 is output through the oil outlet 302. The output purified oil 15 can be stored in a recycling tank.

[0097] In one embodiment of the present invention, the waste frying oil treatment process further includes a hydraulic stirring operation performed simultaneously with the second heating operation, the hydraulic stirring operation including:

[0098] Hydraulic stirring is performed using a settling tank 3 and a reflux assembly. The filtered liquid frying waste oil is loaded into the settling tank 3, and the reflux assembly is turned on so that the liquid frying waste oil at the bottom of the settling tank 3 is extracted and re-input from the top of the settling tank 3, thereby realizing the reflux circulation of liquid frying waste oil in the settling tank 3.

[0099] Specifically, during the hydraulic stirring operation, after the reflux pump is turned on, the liquid frying waste oil at the bottom of the settling tank 3 can be extracted. The liquid frying waste oil flowing out from the reflux outlet flows through the reflux pipe 6 and then flows into the settling tank 3 from the reflux inlet 304, realizing the reflux circulation of the liquid frying waste oil. The high-speed liquid frying waste oil flows in from the top of the settling tank 3, forming a large impact, which plays a role in hydraulic stirring. This can improve the heating efficiency of the liquid frying waste oil, and also save space and height, making it convenient for the oven 1 and the settling tank 3 to be stacked one on top of the other, and facilitating the gravity flow of the liquid frying waste oil into the settling tank 3.

[0100] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various specific technical features in any suitable manner. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately. However, these simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

[0101] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0102] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0103] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A frying waste oil treatment system, characterized in that, The frying waste oil treatment system includes: The oven (1) has an interior space for holding solidified frying waste oil, and a filter screen is provided at the bottom of the interior space. The first heating component (2) is used to heat and melt the solidified frying waste oil into liquid frying waste oil; A settling tank (3) is located below the oven (1) and is used to contain the liquid frying waste oil flowing in from the oven (1). The top of the settling tank (3) is provided with an oil inlet (301), which is connected to the containing space through the filter holes on the filter screen. The bottom of the settling tank (3) is formed with a reflux outlet, and the top of the settling tank (3) is formed with a reflux inlet (304). The second heating component (4) is used to heat the liquid frying waste oil to a preset settling temperature so that the liquid frying waste oil can be purified oil after settling. The reflux assembly includes a reflux pipe (6) and a reflux pump. The two ends of the reflux pipe (6) are connected to the reflux outlet and the reflux inlet (304) respectively. The reflux pump is installed on the reflux pipe (6). After the reflux pump is turned on, the reflux circulation of the liquid frying waste oil is realized. The high-speed liquid frying waste oil flows in from the top of the settling tank (3), which plays a role in hydraulic stirring.

2. The frying waste oil treatment system according to claim 1, characterized in that, The bottom of the settling tank (3) is provided with an oil outlet (302). The frying waste oil treatment system also includes an oil supply pipe (501) and a recycling tank. The two ends of the oil supply pipe (501) are respectively connected to the oil outlet (302) and the recycling tank. The recycling tank is used to store the purified oil (15).

3. The frying waste oil treatment system according to claim 2, characterized in that, The oven (1) includes an inner box (101) and an outer box (102). The accommodating space is formed inside the inner box (101). A sandwich cavity (103) is formed between the inner box (101) and the outer box (102). The first heating component (2) is disposed in the sandwich cavity (103) and can heat the air in the sandwich cavity (103). An air outlet is formed on the side wall of the inner box (101) for the heated air to flow out.

4. The frying waste oil treatment system according to claim 3, characterized in that, The inner box (101) has an air inlet on its top wall. The frying waste oil treatment system also includes a fan (7) installed in the interlayer cavity (103) and used to draw air from the containment space into the interlayer cavity (103). An air duct (104) is formed between the air outlet of the fan (7) and the air outlet.

5. The frying waste oil treatment system according to claim 3, characterized in that, The oven (1) also includes an insulation layer (8) disposed on the outside of the outer box body (102).

6. The frying waste oil treatment system according to claim 2, characterized in that, The frying waste oil treatment system also includes a steam source, and the second heating component (4) includes a steam conveying pipe (401), one end of which is connected to the steam source, and the other end of which extends into the liquid frying waste oil.

7. The frying waste oil treatment system according to claim 6, characterized in that, The second heating component (4) further includes a steam heating pipe (402) connected to the steam source. The steam heating pipe (402) is disposed on the outer side wall of the settling tank (3) and can directly heat the side wall of the settling tank (3).

8. The frying waste oil treatment system according to claim 2, characterized in that, The top of the settling tank (3) is provided with a breather valve (9) for balancing the internal air pressure and the external air pressure of the settling tank (3).

9. The frying waste oil treatment system according to claim 2, characterized in that, The frying waste oil treatment system also includes multiple oil drums (18) for containing the solidified frying waste oil and a transport component (10) for transporting the oil drums (18) to the containing space.

10. The frying waste oil treatment system according to any one of claims 2-9, characterized in that, The frying waste oil treatment system further includes a first temperature detector and a controller. The first temperature detector is used to detect the temperature of the liquid frying waste oil. The controller is communicatively connected to the first temperature detector and the reflux pump and is configured to: Determine that the second heating component (4) is in working condition; Ensure the return pump is in operation; Determine that the temperature of the liquid frying waste oil reaches the first preset temperature. Control the second heating component (4) to stop working; The reflux pump is stopped so that the liquid frying waste oil can be allowed to settle for a preset time to form the purified oil (15).

11. The frying waste oil treatment system according to claim 10, characterized in that, The bottom of the settling tank (3) is provided with a slag outlet (303). The frying waste oil treatment system also includes a settling debris conveying pipe (13) and a first output pump (12) for conveying the settling debris (16) formed after settling in the containment cavity. The first output pump (12) is installed on the settling debris conveying pipe (13).

12. The frying waste oil treatment system according to claim 11, characterized in that, The oil pipeline (501) is equipped with a second output pump (11), the second output pump (11), the first output pump (12) and the controller are communicatively connected, and the control of stopping the return pump so that the liquid frying waste oil can be allowed to settle for a preset time to form the purified oil (15) includes: After the reflux pump stops working for the preset time, the first output pump (12) is turned on to output the sediment (16) formed after settling in the containment cavity and located below the purified oil (15). After the sediment (16) is discharged, the first output pump (12) is turned off and the second output pump (11) is turned on to deliver the purified oil (15) to the recovery tank.

13. The frying waste oil treatment system according to claim 10, characterized in that, The frying waste oil treatment system further includes a second temperature detector disposed in the containment space and used to detect the temperature of the air in the containment space. The second temperature detector, the first heating component (2), and the controller are communicatively connected. The controller is further configured to: Determine that the first heating component (2) is in working condition; Determine that the temperature of the air in the containment space reaches the preset temperature; Control the first heating component (2) to stop working.

14. A process for treating waste frying oil, characterized in that, The waste frying oil treatment process is applicable to the waste frying oil treatment system according to any one of claims 1-13 and includes: First heating operation: heating and melting solidified waste frying oil into liquid waste frying oil; Filtration operation: The liquid frying waste oil is filtered to form filtered liquid frying waste oil; Second heating operation: Heating the filtered liquid frying waste oil to a preset settling temperature; Hydraulic stirring operation: performed simultaneously with the second heating operation; Sedimentation process: The liquid frying waste oil, which has reached the preset sedimentation temperature, is allowed to settle for a preset time to form purified oil and sediment in two layers. Separation operation: The purified oil in the upper layer is separated to obtain the purified oil; wherein, The hydraulic stirring operation includes: Hydraulic stirring is performed using a settling tank (3) and a reflux assembly. Filtered liquid frying waste oil is loaded into the settling tank (3). The reflux assembly is turned on so that the liquid frying waste oil at the bottom of the settling tank (3) is extracted and re-input from the top of the settling tank (3), thereby realizing the reflux circulation of the liquid frying waste oil in the settling tank (3).

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