Base oil extracting, refining, desolventizing and heating system

Abstract

The utility model relates to a base oil extraction refining desolvation heating system, and relates to the technical field of waste oil recovery, and the base oil extraction refining desolvation heating system comprises a desolvation preheater, a desolvation tower, a desolvation reboiler and a desolvation condensation assembly. The extraction raffinate base oil is preheated through the desolventizing preheater and then discharged into the desolventizing tower, the heating time of the extraction raffinate base oil in the desolventizing tower is shortened, the extraction raffinate base oil in the desolventizing tower is circularly heated and reboiled through the desolventizing reboiler, then the extraction raffinate base oil is subjected to solvent removal rectification through the desolventizing tower, and the extraction raffinate base oil is recycled. The steam discharged from the desolventizing tower is temporarily stored after being condensed by the condensation assembly, meanwhile, the vacuum pump set enables the vacuum value in the desolventizing tower to be kept constant, meanwhile, the steam in the desolventizing tower is conveniently sucked into the condensation assembly, finally, the heating time of base oil in the desolventizing tower is shortened, and the desolventizing quality of the base oil is improved.

Description

Technical Field

[0001] The present application relates to the technical field of waste oil recovery, and in particular to a base oil extraction, refining, desolventizing and heating system. Background Art

[0002] Waste lubricating oil is the oil that is replaced after its physical and chemical properties reach the oil change specifications due to oxidation, thermal decomposition, and impurity contamination during the use of various machinery and equipment. It is a liquid waste generated in industrial production and transportation, and is both polluting and resource-intensive. Through the use of advanced process technologies and equipment, it can be separated and processed to produce qualified lubricant base oil products. Due to the imperfect domestic recycling system, scattered sources of waste oil, and small-scale enterprises, domestic waste lubricating oil regeneration mainly uses a sulfuric acid-bleaching clay process, distillation-hydrogenation process, and solvent refining process. With the development of domestic waste lubricating oil regeneration technology and the continuous improvement of environmental protection requirements, solvent refining has been widely accepted and applied by domestic enterprises due to its simple operation, low investment, solvent recycling, and environmental friendliness.

[0003] The waste lubricating oil solvent regeneration and refining process in actual industrial applications primarily consists of three stages: waste base oil extraction, desolventizing the extracted base oil, and solvent recovery. The post-extraction desolventizing stage is the most critical, as it determines both the quality of the regenerated lubricating oil base oil and the solvent recovery rate.

[0004] At present, the main method is to discharge the raffinate base oil into the desolventizing tower, and use the heating device in the desolventizing tower to heat the base oil, so that the solvent evaporates at high temperature, and then condenses it through the condenser and collects it, and finally the pure base oil flows out of the desolventizing tower.

[0005] However, since the temperature of the base oil after extraction is relatively low, in order to evaporate the solvent in the base oil, it takes a long time to circulate and heat it in the desolventizing tower. At the same time, the temperature of the newly added raffinate base oil and the original base oil is quite different, which can easily cause uneven heating of the product and ultimately affect the desolventizing quality of the base oil. Utility Model Content

[0006] In order to reduce the heating time of the base oil in the desolventizing tower and improve the desolventizing quality of the base oil, the present application provides a base oil extraction, refining and desolventizing heating system.

[0007] The present application provides a base oil extraction, refining, desolventizing and heating system, which adopts the following technical solutions:

[0008] A base oil extraction, refining and desolventizing heating system comprises a desolventizing preheater, a desolventizing tower, a desolventizing reboiler and a desolventizing condensing assembly. The desolventizing preheater is used for preheating the raffinate base oil to be desolventized, the desolventizing tower is used for removing solvents and distilling the raffinate base oil discharged from the desolventizing preheater, the desolventizing reboiler is used for heating and reboiling the raffinate base oil in the desolventizing tower, and the desolventizing condensing assembly is used for condensing and recovering the evaporated solvent.

[0009] By adopting the above technical scheme, the raffinate base oil is preheated by the desolventizing preheater and then discharged into the desolventizing tower, thereby reducing the heating time of the raffinate base oil in the desolventizing tower, and the raffinate base oil in the desolventizing tower is circulated, heated and reboiled by the desolventizing reboiler, and then the raffinate base oil is desolventized and distilled by the desolventizing tower. The steam discharged from the desolventizing tower is condensed by the condensing component and then temporarily stored. At the same time, the vacuum pump group keeps the vacuum value in the desolventizing tower constant, and facilitates the steam in the desolventizing tower to be sucked into the condensing component, thereby finally reducing the heating time of the base oil in the desolventizing tower and improving the desolventizing quality of the base oil.

[0010] Furthermore, the desolventizing preheater heats the raffinate base oil to 160°C.

[0011] By adopting the above technical solution, the desolventizing preheater heats the raffinate base oil to 160°C before being discharged into the desolventizing tower, thereby reducing the temperature difference between the raffinate base oil and the desolventizing tower, making the product heating more uniform and improving the desolventizing quality of the base oil.

[0012] Furthermore, the desolventizing reboiler is located outside the desolventizing tower, and the desolventizing tower is provided with a desolventizing circulation pump for discharging the liquid solution in the desolventizing tower into the desolventizing reboiler for heating and reboiling. The desolventizing reboiler discharges the heated and reboiled solution into the desolventizing tower, and the desolventizing reboiler and the desolventizing circulation pump jointly circulate, heat and reboil the solution in the desolventizing tower.

[0013] By adopting the above technical solution, the desolventizing circulation pump discharges the liquid in the desolventizing tower into the desolventizing reboiler for heating and reboiling, and then the desolventizing reboiler discharges the reboiled raffinate base oil back into the desolventizing tower, thereby circulating the raffinate base oil in the desolventizing tower for heating and reboiling.

[0014] Furthermore, the desolventizing reboiler is a falling film reboiler, and the desolventizing reboiler heats the raffinate base oil to 180°C-200°C.

[0015] By adopting the above technical solution, the falling film reboiler has the characteristics of large heat transfer coefficient and high heat transfer efficiency, thereby reducing the number of solvent circulations in the desolventizing tower and ensuring the color quality of the product.

[0016] Furthermore, the desolventizing and condensing component includes:

[0017] a condenser, the condenser being connected to the top of the desolventizing tower and condensing the steam discharged from the desolventizing tower;

[0018] The desolventizing reflux tank is used to temporarily store the condensate discharged from the condenser after condensation.

[0019] By adopting the above technical solution, the condenser is used to condense the steam discharged from the desolventizing tower, and then the desolventizing reflux tank is used to temporarily store the solvent condensed by the condenser, thereby achieving solvent removal.

[0020] Furthermore, the desolventizing tower is provided with a vacuum pump group for maintaining a constant vacuum value in the desolventizing tower. The vacuum pump group is connected to the interior of the desolventizing tower through a desolventizing reflux tank and draws the steam in the desolventizing tower into the condenser for condensation.

[0021] By adopting the above technical solution, the vacuum pump group keeps the vacuum value in the desolventizing tower constant, thereby facilitating the desolventizing treatment of the raffinate base oil. At the same time, the vacuum pump group draws the steam in the desolventizing tower into the condenser, thereby improving the solvent removal efficiency.

[0022] Furthermore, a desolventizing reflux pump is provided on the desolventizing reflux tank, and the desolventizing reflux pump is used to discharge part of the condensate in the desolventizing reflux tank into the desolventizing tower for reflux.

[0023] By adopting the above technical solution, the desolventizing reflux pump discharges part of the solvent in the desolventizing reflux tank back into the desolventizing tower, thereby maintaining the heat balance in the desolventizing tower.

[0024] Furthermore, part of the condensate in the desolventizing reflux tank is transported to the solvent recovery stage for solvent recovery treatment.

[0025] By adopting the above technical solution, the desolventizing reflux pump discharges the solvent with a lower temperature in the desolventizing reflux tank into the solvent recovery stage, thereby facilitating the recovery and treatment of the solvent.

[0026] Furthermore, a desolventizing production pump is provided on the desolventizing tower, and the end of the desolventizing production pump away from the desolventizing tower is connected to the interior of the finished product storage tank. The desolventizing production pump is used to discharge the residual base oil after the solvent is removed into the finished product storage tank for temporary storage.

[0027] By adopting the above technical solution, when the solvent content in the raffinate base oil in the desolventizing tower is lower than the set value, the desolventizing extraction pump discharges the base oil in the desolventizing tower into the finished product storage tank for temporary storage, thereby removing the solvent in the raffinate base oil.

[0028] In summary, this application includes at least one of the following beneficial technical effects:

[0029] The raffinate base oil is preheated by the desolventizing preheater and then discharged into the desolventizing tower, thereby reducing the heating time of the raffinate base oil in the desolventizing tower; the raffinate base oil in the desolventizing tower is circulated, heated and reboiled by the desolventizing reboiler and the desolventizing circulation pump; and then the raffinate base oil is desolventized and distilled by the desolventizing tower; the steam discharged from the desolventizing tower is condensed by the condenser and then discharged into the desolventizing reflux tank for temporary storage; at the same time, the vacuum pump group makes the vacuum value in the desolventizing tower remain constant, and facilitates the steam in the desolventizing tower to be sucked into the condenser, thereby finally reducing the heating time of the base oil in the desolventizing tower and improving the desolventizing quality of the base oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of the base oil extraction, refining, desolventizing and heating system of the present application.

[0031] Figure numerals: 1. Desolventizing preheater; 2. Desolventizing tower; 3. Desolventizing reboiler; 31. Desolventizing circulation pump; 4. Desolventizing condensation assembly; 41. Condenser; 42. Desolventizing reflux tank; 43. Desolventizing reflux pump; 5. Vacuum pump group; 6. Desolventizing production pump. DETAILED DESCRIPTION

[0032] The following is combined with Figure 1 This application is described in further detail.

[0033] The embodiments of the present application disclose a base oil extraction, refining, desolventizing and heating system.

[0034] Reference Figure 1 A base oil extraction, refining and desolventizing heating system includes a desolventizing preheater 1, a desolventizing tower 2, a desolventizing reboiler 3 and a desolventizing condensing component 4. The desolventizing preheater 1 is used for preheating the raffinate base oil to be desolventized, the desolventizing tower 2 is used for removing solvents and distilling the raffinate base oil discharged from the desolventizing preheater 1, the desolventizing reboiler 3 is used for heating and reboiling the raffinate base oil in the desolventizing tower 2, and the desolventizing condensing component 4 is used for condensing and recovering the evaporated solvent.

[0035] Reference Figure 1 The raffinate base oil extracted in the extraction stage is preheated by the desolventizing preheater 1 before entering the desolventizing tower 2, so that the temperature of the raffinate base oil reaches a certain range, thereby shortening the temperature difference of the raffinate base oil in the desolventizing tower 2 newly added, thereby shortening the heating time of the raffinate base oil in the desolventizing tower 2, so that the color of the product raffinate base oil will not deepen, thereby ensuring the chromaticity quality of the finished base oil; the desolventizing preheater 1 of this embodiment raises the temperature of the raffinate base oil to about 160°C.

[0036] Reference Figure 1The desolventizing reboiler 3 is located outside the desolventizing tower 2, and a desolventizing circulation pump 31 is fixedly installed on the desolventizing tower 2. The liquid in the desolventizing tower 2 is discharged into the desolventizing reboiler 3 through the desolventizing circulation pump 31 for heating and reboiling, and then the heated and reboiled liquid and gas are discharged back into the desolventizing tower 2, and the heated and reboiled liquid is desolventized and distilled through the desolventizing tower 2. Finally, the gaseous steam is discharged through the top of the desolventizing tower 2, and the liquid flows back into the bottom of the desolventizing tower 2, and the liquid is discharged into the desolventizing reboiler 3 again through the desolventizing circulation pump 31 for reheating and reboiling, so that the raffinate base oil in the desolventizing tower 2 is circulated, heated and reboiled under the joint action of the desolventizing circulation pump 31 and the desolventizing reboiler 3; the desolventizing reboiler 3 of this embodiment heats the raffinate base oil to 180℃-200℃, and the desolventizing reboiler 3 is a falling film reboiler.

[0037] Reference Figure 1 The desolventizing and condensing component 4 includes a condenser 41 and a desolventizing reflux tank 42. The condenser 41 is interconnected with the top of the desolventizing tower 2. The condenser 41 is used to condense the steam discharged from the top of the desolventizing tower 2; the desolventizing reflux tank 42 is fixedly connected to the condenser 41, and the desolventizing reflux tank 42 temporarily stores the condensate discharged from the condenser 41.

[0038] Reference Figure 1 A desolventizing reflux pump 43 is fixedly installed on the desolventizing reflux tank 42. The desolventizing reflux pump 43 is used to discharge part of the condensate in the desolventizing reflux tank 42 into the separation tower for reflux, thereby maintaining the heat balance in the desolventizing tower 2; at the same time, part of the condensate in the desolventizing reflux tank 42 is transported to the solvent recovery stage through the desolventizing reflux pump 43 for solvent recovery treatment.

[0039] Reference Figure 1 The desolventizing tower 2 is provided with a vacuum pump group 5 for maintaining a constant vacuum value in the desolventizing tower 2. At the same time, in order to facilitate the discharge of the steam in the desolventizing tower 2 into the condenser 41 for condensation, the vacuum pump group 5 is connected to the inside of the desolventizing tower 2 through the desolventizing reflux tank 42, so as to ensure that the vacuum value in the desolventizing tower 2 is constant while facilitating the suction of the steam in the desolventizing tower into the condenser 41 for condensation; the vacuum pump group 5 of this embodiment maintains the vacuum value in the desolventizing tower 2 at 1kPa.

[0040] Reference Figure 1 A desolventizing pump 6 is provided on the desolventizing tower 2, one end of the desolventizing pump 6 is connected to the bottom of the desolventizing tower 2, so as to discharge the liquid in the desolventizing tower 2, and the end of the desolventizing pump 6 away from the desolventizing tower 2 is connected to the inside of the finished product storage tank. When the solvent content in the raffinate base oil in the desolventizing tower 2 is lower than the set value, the desolventizing pump 6 discharges the base oil in the desolventizing tower 2 into the finished product storage tank for temporary storage, so as to remove the solvent in the raffinate base oil; after the solvent content in the raffinate base oil in this embodiment is less than or equal to 20 ppm, it can be discharged into the finished product storage tank through the desolventizing pump 6.

[0041] The working principle of the embodiment of this application is as follows:

[0042] The raffinate base oil is preheated by the desolventizing preheater 1 and then discharged into the desolventizing tower 2, thereby reducing the heating time of the raffinate base oil in the desolventizing tower 2. The raffinate base oil in the desolventizing tower 2 is circulated, heated and reboiled by the desolventizing reboiler 3 and the desolventizing circulation pump 31, and then the raffinate base oil is desolventized and distilled by the desolventizing tower 2. The steam discharged from the desolventizing tower 2 is condensed by the condenser 41 and then discharged into the desolventizing reflux tank 42 for temporary storage. At the same time, the vacuum pump group 5 keeps the vacuum value in the desolventizing tower 2 constant, and facilitates the suction of the steam in the desolventizing tower 2 into the condenser 41, thereby reducing the heating time of the base oil in the desolventizing tower 2 and improving the desolventizing quality of the base oil.

[0043] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A base oil extraction, refining, desolventizing and heating system, characterized by: The invention comprises a desolventizing preheater (1), a desolventizing tower (2), a desolventizing reboiler (3) and a desolventizing condensation assembly (4), wherein the desolventizing preheater (1) is used for preheating the raffinate base oil to be desolventized, the desolventizing tower (2) is used for removing the solvent from the raffinate base oil discharged from the desolventizing preheater (1), the desolventizing reboiler (3) is used for heating and reboiling the raffinate base oil in the desolventizing tower (2), and the desolventizing condensation assembly (4) is used for condensing and recovering the evaporated solvent.

2. The base oil extraction, refining, desolventizing and heating system according to claim 1, characterized in that: The desolventizing preheater (1) heats the raffinate base oil to 160°C.

3. The base oil extraction, refining, desolventizing and heating system according to claim 2, characterized in that: The desolventizing reboiler (3) is located outside the desolventizing tower (2). The desolventizing tower (2) is provided with a desolventizing circulation pump (31) for discharging the liquid solution in the desolventizing tower (2) into the desolventizing reboiler (3) for heating and reboiling. The desolventizing reboiler (3) discharges the heated and reboiled solution into the desolventizing tower (2). The desolventizing reboiler (3) and the desolventizing circulation pump (31) jointly circulate the solution in the desolventizing tower (2) for heating and reboiling.

4. The base oil extraction, refining, desolventizing and heating system according to claim 3, characterized in that: The desolventizing reboiler (3) is a falling film reboiler, and the desolventizing reboiler (3) heats the raffinate base oil to 180°C-200°C.

5. The base oil extraction, refining, desolventizing and heating system according to claim 1, characterized in that: The desolventizing and condensing component (4) comprises: a condenser (41), the condenser (41) being in communication with the top of the desolventizing tower (2) and condensing the steam discharged from the desolventizing tower (2); The desolventizing reflux tank (42) is used to temporarily store the condensate discharged from the condenser (41) after condensation.

6. The base oil extraction, refining, desolventizing and heating system according to claim 5, characterized in that: The desolventizing tower (2) is provided with a vacuum pump group (5) for maintaining a constant vacuum value in the desolventizing tower (2). The vacuum pump group (5) is connected to the interior of the desolventizing tower (2) through the desolventizing reflux tank (42) and draws the steam in the desolventizing tower (2) into the condenser (41) for condensation.

7. The base oil extraction, refining, desolventizing and heating system according to claim 5, characterized in that: The desolventizing reflux tank (42) is provided with a desolventizing reflux pump (43), and the desolventizing reflux pump (43) is used to discharge part of the condensate in the desolventizing reflux tank (42) into the desolventizing tower (2) for reflux.

8. The base oil extraction, refining, desolventizing and heating system according to claim 7, characterized in that: Part of the condensate in the desolventizing reflux tank (42) is transported to the solvent recovery stage for solvent recovery treatment.

9. The base oil extraction, refining, desolventizing and heating system according to claim 1, characterized in that: The desolventizing tower (2) is provided with a desolventizing extraction pump (6), and one end of the desolventizing extraction pump (6) away from the desolventizing tower (2) is connected to the interior of the finished product storage tank. The desolventizing extraction pump (6) is used to discharge the raffinate base oil after the solvent is removed into the finished product storage tank for temporary storage.

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