Efficient waste oil recovery equipment

Abstract

This utility model provides a high-efficiency waste oil recycling equipment, belonging to the field of mechanical technology, which solves the problem of low recycling quality in existing oil recycling equipment. This high-efficiency waste oil recycling equipment includes: two heat conditioning tanks, with a first heating tube wound around the outer wall of each tank from top to bottom; the bottom cover of each tank is semi-ellipsoidal, with a slag outlet in the center and a discharge outlet on one side; a three-phase centrifuge equipped with a feed motor (a variable frequency motor) that receives the slurry from the heat conditioning tanks and performs three-phase separation to obtain oil; and a purification tank that receives the oil from the three-phase centrifuge and purifies it. A second heating tube is arranged around the inside of the purification tank. The slurry passes sequentially through the two heat conditioning tanks, the three-phase centrifuge, and the purification tank before being output as the corresponding finished oil. This utility model features high-quality oil recycling.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical technology and relates to a high-efficiency waste oil recycling equipment, particularly a high-efficiency waste oil recycling equipment with high oil extraction rate and good oil quality. Background Technology

[0002] Perishable waste (such as kitchen waste) contains extremely high levels of moisture and organic matter. With proper treatment and processing, it can be transformed into new resources, such as fertilizer and feed, or it can produce biogas for use as fuel or for power generation. The oil portion can be used to prepare biofuels.

[0003] Currently, most domestic treatment of perishable waste uses heating and oil extraction processes. The mainstream method is to use direct steam heating followed by high-speed centrifugation to extract oil. The main advantages are high heating efficiency and small equipment footprint. However, direct heating can easily lead to steam entering the slurry, causing oil to be lost with water and slag, resulting in a low oil extraction rate. In addition, since the quality of oil recovery depends entirely on the operation of the centrifuge equipment, and the traditional centrifuge feeding mode is prone to blockage, there is also the problem of unstable oil quality.

[0004] In summary, to address the shortcomings of existing grease recycling equipment structures, this utility model designs a high-efficiency waste grease recycling device with a reasonable structure and high grease recycling quality. Summary of the Invention

[0005] This invention addresses the problems existing in the prior art by providing a high-efficiency waste oil recycling equipment with a reasonable structure and high oil recovery quality.

[0006] The objective of this utility model can be achieved through the following technical solution: a high-efficiency waste oil recycling device, comprising:

[0007] Two heat conditioning tanks are arranged side by side and connected to each other. A first motor is fixed in the middle of the top cover of the heat conditioning tank. The output shaft of the first motor is connected to a first stirring shaft. A feed port for slurry input is opened on one side of the first motor. A first heating tube is wound around the outer peripheral wall of the heat conditioning tank from top to bottom. The bottom cover of the heat conditioning tank is semi-ellipsoidal. A slag outlet is opened in the middle of the bottom cover. A discharge outlet is opened on one side of the slag outlet. The slurry is heated and stirred by the two heat conditioning tanks and then output to the outside through the discharge outlet.

[0008] A three-phase centrifuge is connected to one of the heat conditioning tanks. The three-phase centrifuge is equipped with a feed motor, which is a variable frequency motor. The three-phase centrifuge can receive the slurry output from the heat conditioning tank and perform three-phase separation on the slurry to obtain oil.

[0009] The purification tank is located on one side of the three-phase centrifuge. The purification tank receives the oil output from the three-phase centrifuge and purifies the oil. A second heating tube is arranged around the inside of the purification tank. The slurry passes through two heat conditioning tanks, the three-phase centrifuge, and the purification tank in sequence before being output as the corresponding finished oil.

[0010] As a further improvement to this design, the bottom cover has a semi-elliptical cross-section, and a third heating tube is spirally arranged around the bottom cover from the outside in.

[0011] As a further improvement in this case, the cross-sections of the first heating tube and the third heating tube are both semi-circular, and the arc side of the first heating tube and the third heating tube is set away from the heat conditioning tank.

[0012] As a further improvement to this case, a second motor is installed on the top of the purification tank, and the output shaft of the second motor extends vertically downward through the purification tank and is fixedly connected to a second stirring shaft. An isolation plate is arranged around the second stirring shaft, and several support plates are arranged horizontally at intervals on the outer side of the isolation plate. Each support plate is fixedly connected to the inner wall of the purification tank.

[0013] As a further improvement in this case, the aforementioned second heating tube is spirally arranged from top to bottom along the inner side of the isolation plate, and the cross-section of the second heating tube is circular.

[0014] As a further improvement to this case, the bottom of the purification tank is set in a conical shape, and the aforementioned partition plate extends vertically downward and abuts against the inner wall of the bottom of the purification tank.

[0015] As a further improvement in this case, the purification tank has an inlet at the top, a deodorization port on one side of the inlet, and an external blower connected to the deodorization port. The purification tank has an outlet at the bottom, and a level transmitter is installed above the outlet.

[0016] Compared with existing technologies, this utility model has a reasonable structural design. By setting a first heating tube outside the heat conditioning tank for indirect heating, it avoids the loss of oil with water and residue caused by direct heating. A purification tank is set up with a second heating tube inside, which can quickly heat and further purify the oil, improving the oil extraction rate while ensuring the quality of the finished oil. In addition, the feed motor of the three-phase centrifuge adopts a variable frequency motor to control the flow rate of slurry into the three-phase centrifuge, thereby adapting to the three-phase separation operation of the three-phase centrifuge, enhancing oil separation, and avoiding feed blockage, resulting in good performance. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model.

[0018] Figure 2 This is a schematic diagram of the heat conditioning tank in this utility model.

[0019] Figure 3 yes Figure 2 Top view.

[0020] Figure 4 This is a schematic diagram of the purification tank in this utility model.

[0021] Figure 5 yes Figure 4 Top view.

[0022] In the diagram, 10 is a heat conditioning tank; 11 is the first motor; 12 is the first stirring shaft; 13 is the feed inlet; 14 is the slag outlet; 15 is the discharge outlet; 20 is a three-phase centrifuge; 21 is the feed motor; 30 is a purification tank; 31 is the second motor; 32 is the second stirring shaft; 33 is the input port; 34 is the output port; 35 is the deodorization interface; 36 is the level transmitter; 41 is the first heating tube; 42 is the second heating tube; 43 is the third heating tube; 44 is the steam inlet and outlet; 50 is the isolation plate; and 51 is the support plate. Detailed Implementation

[0023] The technical solution of this utility model will be further described below with reference to the embodiments and accompanying drawings.

[0024] like Figures 1 to 5 As shown, this high-efficiency waste oil recycling equipment includes:

[0025] Two heat conditioning tanks 10 are arranged side by side and connected to each other. A first motor 11 is fixed in the middle of the top cover of the heat conditioning tank 10. The output shaft of the first motor 11 is connected to a first stirring shaft 12. A feed port 13 for slurry input is opened on one side of the first motor 11. A first heating tube 41 is wound around the outer peripheral wall of the heat conditioning tank 10 from top to bottom. The bottom cover of the heat conditioning tank 10 is semi-ellipsoidal. A slag outlet 14 is opened in the middle of the bottom cover. A discharge outlet 15 is opened on one side of the slag outlet 14. The slurry is heated and stirred by the two heat conditioning tanks 10 and then output to the outside through the discharge outlet 15.

[0026] A three-phase centrifuge 20 is connected to one of the heat conditioning tanks 10. The three-phase centrifuge 20 is equipped with a feed motor 21, which is configured as a variable frequency motor. The three-phase centrifuge 20 can receive the slurry output from the heat conditioning tank 10 and perform three-phase separation on the slurry to obtain oil.

[0027] Purification tank 30 is located on one side of three-phase centrifuge 20. Purification tank 30 receives the grease output from three-phase centrifuge 20 and purifies the grease. A second heating tube 42 is arranged around the inside of purification tank 30. The slurry passes through two heat conditioning tanks 10, three-phase centrifuge 20 and purification tank 30 in sequence before being output to obtain the corresponding finished grease.

[0028] Currently, most domestic treatment of perishable waste uses heating and oil extraction processes. The mainstream method is to use direct steam heating followed by high-speed centrifugation to extract oil. The main advantages are high heating efficiency and small equipment footprint. However, direct heating can easily lead to steam entering the slurry, causing oil to be lost with water and slag, resulting in a low oil extraction rate. In addition, since the quality of oil recovery depends entirely on the operation of the centrifuge equipment, and the traditional centrifuge feeding mode is prone to blockage, there is also the problem of unstable oil quality.

[0029] To address this, the present invention provides a high-efficiency waste oil recycling device. Indirect heating is achieved by installing a first heating tube 41 outside the heat conditioning tank 10, avoiding direct heating that could lead to oil loss with water and residue. A purification tank 30 is installed, with a second heating tube 42 inside, allowing for rapid heating and further purification of the oil, improving the oil extraction rate while ensuring the quality of the finished oil. Furthermore, the feed motor 21 of the three-phase centrifuge 20 uses a variable frequency motor to control the flow rate of the slurry entering the three-phase centrifuge 20, thus adapting to the three-phase separation operation of the centrifuge 20, enhancing oil separation, and preventing feed blockage, resulting in excellent performance.

[0030] This high-efficiency waste oil recycling equipment consists of a heat conditioning tank 10, a three-phase centrifuge 20, and a purification tank 30. The kitchen waste slurry is pumped to the heat conditioning tank 10, where it is heated to 90℃-95℃ for heat conditioning treatment, which improves the separability of the oil and ensures that the material entering the three-phase centrifuge 20 is uniformly mixed and at a temperature of 80℃-85℃. The oil separated by the three phases enters the purification tank 30 for further purification, and finally, the finished oil is obtained.

[0031] Specifically, in this embodiment, two heat conditioning tanks 10 are preferably used to perform two stirring and slag removal on the slurry. The two heat conditioning tanks 10 are connected in series, namely a primary heat conditioning tank and a secondary heat conditioning tank. After the slurry is heated, stirred and slag removed in the first heat conditioning tank 10 (primary heat conditioning tank), it enters the second heat conditioning tank 10 (secondary heat conditioning tank) for secondary heating, stirring and slag removal. This continuously provides the subsequent three-phase centrifuge 20 with relatively stable oil, water and slag three-phase materials to adapt to the separation operation of the three-phase centrifuge 20.

[0032] Furthermore, after the three-phase separation process, a purification tank 30 is added for secondary purification, thereby reducing the content of moisture, volatiles, and insoluble impurities in the oil and further reducing the acid value. At the same time, it can also avoid the risk of unstable oil quality due to the unstable operation of the three-phase centrifuge 20.

[0033] In this embodiment, the first heating tube 41 is preferably wound around the outer peripheral side wall of the heat conditioning tank 10 from top to bottom. Through external indirect heating, clean steam is prevented from entering the perishable waste slurry and then entering the three-phase separation stage of the three-phase centrifuge 20, thereby reducing the loss of oil with water and sludge during the three-phase separation stage and achieving the purpose of increasing the amount of oil recovered.

[0034] A three-phase centrifuge 20 typically includes two motors: a main motor and an auxiliary motor. The main motor drives the drum to rotate at high speed, generating a huge centrifugal force that causes the material to deposit on the inner wall of the drum. The auxiliary motor (feed motor 21) is connected to the main motor via a differential gear, controlling the speed of the spiral and ensuring the relative motion between the spiral and the drum, thereby achieving continuous and efficient separation of the material. The coordinated work of the two motors enables the three-phase centrifuge 20 to efficiently complete the separation and discharge of materials.

[0035] In this embodiment, the preferred three-phase centrifuge 20 is a sedimentation type three-phase centrifuge 20. The feed motor 21 of the three-phase centrifuge 20 is a variable frequency motor, and the variable frequency control mode is adopted. When the feed ball valve is fully open, the working frequency of the feed motor 21 is controlled to control the feed flow rate, so as to adapt to the three-phase separation operation of the three-phase centrifuge 20, achieve the best oil separation effect, and effectively reduce the risk of feed blockage.

[0036] It is worth mentioning that the first motor 11 on the heat conditioning tank 10 also adopts frequency conversion control. In actual operation, the speed of the first motor 11 can be tested to obtain a suitable speed, so as to provide a relatively uniform slurry for subsequent three-phase separation, adapt to the separation speed of the three-phase centrifuge 20, improve the extraction yield of oil while ensuring the quality of oil.

[0037] Preferably, the bottom cover has a semi-elliptical cross-section, and a third heating tube 43 is spirally arranged around the bottom cover from the outside to the inside.

[0038] In this embodiment, the bottom cover of the heat conditioning tank 10 is preferably set in a semi-ellipsoidal shape, that is, the cross-section of the bottom cover is set in a semi-elliptical shape. This structural design allows the heat conditioning tank 10 to have sufficient sand settling space and has its own sand settling function, realizing the integration of heating, mixing and sand settling. This reduces the need for special sand settling and impurity removal equipment in the preceding process, which can reduce equipment investment, reduce the number of process chains, and thus reduce the loss of oil.

[0039] Meanwhile, a third heating tube 43 is also arranged around the bottom cover to ensure that the heat conditioning tank 10 is heated evenly from top to bottom, improve the heating effect of the heat conditioning tank 10, and facilitate the separation and removal of slurry.

[0040] Preferably, the slag outlet 14 is located at the lowest point in the middle of the bottom cover, while the discharge outlet 15 is located above and to the side of the slag outlet 14, which facilitates the discharge of slag and is beneficial for the separation of slag from water and oil in the slurry.

[0041] Furthermore, the cross-sections of the first heating tube 41 and the third heating tube 43 are both semi-circular, and the arc side of the first heating tube 41 and the third heating tube 43 is positioned away from the heat conditioning tank 10.

[0042] It is worth mentioning that, in this embodiment, the cross-sections of the first heating tube 41 and the third heating tube 43 are preferably semi-circular, and one side of the arc surface of the heating tube is set away from the heat conditioning tank 10. This structural arrangement can increase the contact area between the heating tube and the heat conditioning tank 10, ensuring a good heating effect.

[0043] Preferably, a second motor 31 is installed on the top of the purification tank 30, and the output shaft of the second motor 31 extends vertically downward through the purification tank 30 and is fixedly connected to a second stirring shaft 32. An isolation plate 50 is arranged around the second stirring shaft 32, and multiple support plates 51 are arranged horizontally at intervals on the outer side of the isolation plate 50. Each support plate 51 is fixedly connected to the inner wall of the purification tank 30.

[0044] Furthermore, the second heating tube 42 is spirally arranged from top to bottom along the inner side of the isolation plate 50, and the cross-section of the second heating tube 42 is circular.

[0045] Heated by the second heating tube 42 inside the purification tank 30, the second stirring shaft 32 driven by the second motor 31 stirs and purifies the input oil. The second heating tube 42 is spirally arranged from top to bottom to uniformly heat the oil inside. At the same time, the second heating tube 42 is directly placed inside the purification tank 30, which can quickly increase the temperature inside the purification tank 30 during heating, which is beneficial to the purification of the oil inside.

[0046] Preferably, an isolation plate 50 is installed around the second stirring shaft 32 inside the purification tank 30. The isolation plate 50 facilitates the installation of the second heating tube 42. On the other hand, the isolation plate 50 is connected to the inner wall of the purification tank 30 through various support plates 51, so that multiple partition spaces are formed between the isolation plate 50 and the inner wall of the purification tank 30, thereby slowing down the drop in internal temperature and playing a role in heat preservation, which is beneficial to the purification of internal oils.

[0047] Preferably, the bottom of the purification tank 30 is conical, and the aforementioned partition plate 50 extends vertically downward and abuts against the inner wall of the bottom of the purification tank 30. The conical structure of the bottom of the purification tank 30 facilitates subsequent oil output, and the bottom of the partition plate 50 is connected to the inner wall of the cone, which facilitates the containment of oil within the partition plate 50 and is beneficial for the heat preservation effect of the oil.

[0048] Furthermore, the purification tank 30 has an inlet 33 at the top, a deodorization port 35 on one side of the inlet 33, and an external induced draft fan (not shown in the figure) connected to the deodorization port 35. The purification tank 30 has an outlet 34 at the bottom, and a liquid level transmitter 36 is installed above the outlet 34.

[0049] After being output from the three-phase centrifuge 20, the oil enters the purification tank 30 through the inlet 33 for heating, stirring and purification. After heating and stirring for a certain period of time, it is left to stand. At this time, the purification tank 30 is kept at a high temperature. Due to the density difference between the oil and the water residue, the oil floats to the top and the water residue sinks to the bottom during the standing process. After a certain period of time, the water residue can be discharged from the outlet 34 first.

[0050] Preferably, a level transmitter 36 is installed above the output port 34 to measure and feed back the level of grease and water sludge. Operators can discharge water sludge and output grease based on the specific level information. The finished grease can be directly transported to the finished oil tank through the pipeline.

[0051] The deodorization port 35, in conjunction with the induced draft fan, can draw out the gas generated at high temperature inside the purification tank 30 and deodorize it, thereby improving the production environment.

[0052] It is worth mentioning that the first heating tube 41, the second heating tube 42 and the third heating tube 43 internally circulate steam, and each heating tube is connected to a steam inlet and outlet 44 at both ends. The specific direction of steam in and out is not limited and can be set according to actual needs.

[0053] This waste oil high-efficiency recycling equipment has a reasonable structure. Indirect heating is achieved by setting a first heating tube 41 outside the heat conditioning tank 10, avoiding direct heating that would cause oil to be lost with water and residue. A purification tank 30 is set up, and a second heating tube 42 is set inside the purification tank 30, which can quickly heat and further purify the oil, improving the oil extraction rate while ensuring the quality of the finished oil. In addition, the feed motor 21 of the three-phase centrifuge 20 adopts a variable frequency motor to control the flow rate of slurry entering the three-phase centrifuge 20, thereby adapting to the three-phase separation operation of the three-phase centrifuge 20, enhancing oil separation, and avoiding feed blockage, resulting in good performance.

[0054] This invention comprises a heat conditioning tank 10, a three-phase centrifuge 20, and a purification tank 30. Kitchen waste slurry is pumped to the heat conditioning tank 10 for heat conditioning treatment, ensuring that the material entering the three-phase centrifuge 20 is uniformly mixed and at a temperature of 80℃-85℃. The oil separated by the three phases enters the purification tank 30 for further purification. The final oil has a water-sludge ratio (total content of moisture, volatile matter, and insoluble impurities) not exceeding 1%, an acid value not exceeding 40 mg KOH / g, and the extracted oil accounts for no less than 98% of the recoverable floating oil from waste oil.

[0055] The embodiments described herein are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or additions to the specific embodiments described, or substitutions made by those skilled in the art, should be covered within the scope of protection of the present invention.

Claims

1. A kind of high-efficiency recovery equipment of waste oil, it is characterized in that, include: Two heat conditioning tanks are arranged side by side and connected to each other. A first motor is fixed in the middle of the top cover of the heat conditioning tank. The output shaft of the first motor is connected to a first stirring shaft. A feed port for slurry input is opened on one side of the first motor. A first heating tube is wound around the outer peripheral wall of the heat conditioning tank from top to bottom. The bottom cover of the heat conditioning tank is semi-ellipsoidal. A slag outlet is opened in the middle of the bottom cover. A discharge outlet is opened on one side of the slag outlet. The slurry is heated and stirred by the two heat conditioning tanks and then output to the outside through the discharge outlet. A three-phase centrifuge is connected to one of the heat conditioning tanks. The three-phase centrifuge is equipped with a feed motor, which is a variable frequency motor. The three-phase centrifuge can receive the slurry output from the heat conditioning tank and perform three-phase separation on the slurry to obtain oil. The purification tank is located on one side of the three-phase centrifuge. The purification tank receives the oil output from the three-phase centrifuge and purifies the oil. A second heating tube is arranged around the inside of the purification tank. The slurry passes through two heat conditioning tanks, the three-phase centrifuge, and the purification tank in sequence before being output as the corresponding finished oil.

2. The high-efficiency waste oil recovery equipment according to claim 1, characterized in that, The bottom cover has a semi-elliptical cross-section, and a third heating tube is spirally arranged around the bottom cover from the outside to the inside.

3. The equipment according to claim 2, characterized in that, The cross-sections of the first heating tube and the third heating tube are both semi-circular, and the arc side of the first heating tube and the third heating tube is positioned away from the heat conditioning tank.

4. The equipment according to claim 1, characterized in that, A second motor is installed on the top of the purification tank, and the output shaft of the second motor extends vertically downward through the purification tank and is fixedly connected to a second stirring shaft. An isolation plate is arranged around the second stirring shaft, and several support plates are arranged horizontally at intervals on the outer side of the isolation plate. Each support plate is fixedly connected to the inner wall of the purification tank.

5. The equipment according to claim 4, characterized in that, The second heating tube is spirally arranged from top to bottom along the inner side of the isolation plate, and the cross-section of the second heating tube is circular.

6. The equipment according to claim 4, characterized in that, The bottom of the purification tank is conical, and the aforementioned partition plate extends vertically downward and abuts against the inner wall of the bottom of the purification tank.

7. The equipment according to claim 1, characterized in that, The purification tank has an inlet at the top, a deodorization port on one side of the inlet, and an external blower connected to the deodorization port. The purification tank has an outlet at the bottom, and a level transmitter is installed above the outlet.

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