Auxiliary heating device for regeneration distillation of waste lubricating oil

Abstract

The invention provides a waste lubricating oil regeneration distillation auxiliary heating device, and belongs to the technical field of waste lubricating oil regeneration, the waste lubricating oil regeneration distillation auxiliary heating device comprises a liquid storage cylinder used for storing waste lubricating oil, the top of the liquid storage cylinder is fixedly provided with a mounting cover used for sealing the liquid storage cylinder, and the mounting cover is connected with a liquid inlet pipe and a liquid outlet pipe; the liquid inlet pipe and the liquid discharge pipe extend into the liquid storage cylinder; solar energy is introduced for energy supply, and use of mains supply in the daytime is greatly reduced; the mains supply is used for supplying energy for production at night, so that the electricity generated at night is prevented from being wasted, and the electricity expenditure for heating the waste lubricating oil is reduced; the blades of the stirring shaft are tightly attached to the inner wall of the liquid storage cylinder, when waste lubricating oil is stirred, the inner wall of the liquid storage cylinder can be cleaned, coking deposition is basically avoided, and therefore the heat transfer effect is improved, and energy loss is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of waste lubricating oil regeneration, and in particular to a waste lubricating oil regeneration distillation auxiliary heating device. Background Art

[0002] Waste lubricating oil regeneration is the process of restoring the quality of used and degraded waste lubricating oil to a quality close to that of new oil through a series of treatment processes. This not only reduces dependence on new oil, but also reduces environmental pollution caused by improper discharge of waste oil.

[0003] The waste lubricating oil regeneration process includes pretreatment, distillation, refining, and post-treatment. Before distillation, the waste lubricating oil needs to be preheated to reach the set temperature before distillation.

[0004] At present, when heating waste lubricating oil, the waste lubricating oil is first discharged into a heating container. After the waste lubricating oil is heated to a set temperature in the heating container, the waste lubricating oil is transported to the distillation equipment through a lifting pump.

[0005] Waste lubricating oil heating methods mainly include heat exchanger heat exchange and electric heating. Heat exchange by heat exchanger has good energy efficiency and can achieve high heat exchange efficiency, so the energy consumption is relatively low. However, the structure of the heat exchange system is relatively complex, the floor space is large, and the initial investment cost is relatively high. Therefore, it is more suitable for large-scale or ultra-large-scale industrial applications. Electric heating can heat instantly, has a simple structure, and has a relatively low initial investment cost. Its application is relatively more extensive. However, the energy conversion efficiency of electric heating is relatively low, and the electricity bill is too high, resulting in high operating costs. Summary of the invention

[0006] The invention provides a waste lubricating oil regeneration distillation auxiliary heating device to solve the technical problems in the prior art.

[0007] In order to solve the above problems, the waste lubricating oil regeneration distillation auxiliary heating device provided by the present invention adopts the following technical solution: comprising a liquid storage cylinder, which is used to store waste lubricating oil, a mounting cover for sealing the liquid storage cylinder is fixedly installed on the top of the liquid storage cylinder, and a liquid inlet pipe and a liquid discharge pipe are respectively connected to the mounting cover, and the liquid inlet pipe and the liquid discharge pipe both extend into the liquid storage cylinder;

[0008] The stirring shaft is rotatably mounted in the liquid storage cylinder, and a stirring motor for driving the stirring shaft to rotate is fixedly mounted on the mounting cover; the spiral blades of the stirring shaft are in contact with the inner wall of the liquid storage cylinder;

[0009] A heating sleeve is sleeved on the liquid storage cylinder and is used to heat the liquid storage cylinder; the heating sleeve is connected to the photovoltaic power generation equipment and the mains power equipment respectively;

[0010] The lifting pump is installed at the bottom of the liquid storage cylinder. The lifting pump is used to lift the waste lubricating oil. The liquid inlet of the lifting pump extends to the inner bottom of the liquid storage cylinder, and the liquid outlet of the lifting pump is connected with the drain pipe.

[0011] By adopting the above technical solution, the electricity expenditure for heating waste lubricating oil with electricity is reduced. On the one hand, the present invention introduces solar energy for energy supply. During the preheating step of waste lubricating oil, except in bad weather during the day, almost no mains electricity is needed, which greatly reduces the use of mains electricity during the day; at night, mains electricity is used for energy supply for production, avoiding the waste of electricity generated at night, thereby reducing the electricity expenditure for heating waste lubricating oil.

[0012] On the other hand, by changing the structure of the heating device, the effect of heat transfer is improved and energy loss is reduced. When the first generation of heating devices was first designed, a stirring structure was set up in the liquid storage cylinder to make the waste lubricating oil evenly heated, so as to ensure that the temperature of the waste lubricating oil in the liquid storage cylinder is relatively consistent. It has been verified that the stirring structure can achieve the expected effect. However, new problems have also been discovered: a large amount of impurities can be removed from the waste lubricating oil in the pretreatment step, but the waste lubricating oil entering the liquid storage cylinder still contains a small amount of impurities. During the heating process, the waste lubricating oil is prone to form coking deposits on the inner wall of the liquid storage cylinder. Although the stirring structure improves the fluidity of the waste lubricating oil and slows down the rate of coking deposits, as the use time increases, a coking layer will still be deposited on the inner wall of the liquid storage cylinder, affecting the heating effect, and it needs to be disassembled and cleaned regularly.

[0013] Regarding this problem, the present invention places the lifting pump and the corresponding pipelines externally, so that there is no interference in the liquid storage cylinder. The stirring shaft adopts spiral stirring blades, and the blades of the stirring shaft are close to the inner wall of the liquid storage cylinder. When stirring the waste lubricating oil, the inner wall of the liquid storage cylinder can be cleaned, which basically avoids the occurrence of coking deposits, thereby improving the heat transfer effect and reducing energy loss.

[0014] As a further improvement, a heat-insulating layer is also provided on the outside of the heating sleeve.

[0015] By adopting the above technical solution, heat loss can be reduced.

[0016] As a further improvement, a groove is provided on the inner wall of the thermal insulation layer, a thermostatic box is fixedly installed in the groove, the bottom of the thermostatic box is connected to the lifting pump, and the top of the thermostatic box is connected to the drain pipe.

[0017] By adopting the above technical solution, the temperature of the waste lubricating oil can be prevented from dropping after being discharged. The constant temperature box is a tile-like structure, which fits the heating sleeve and has a relatively larger contact area. The constant temperature box is embedded in the inner wall of the insulation layer, which can ensure that the temperature of the waste lubricating oil when entering the drain pipe is consistent with the temperature in the liquid storage cylinder.

[0018] As a further improvement, a three-way pipe is fixedly connected to the discharge pipe, a reversing valve is fixedly installed in the three-way pipe, the thermostatic box is connected to the three-way pipe through a connecting pipe, and a first temperature sensor is fixedly installed in the connecting pipe.

[0019] By adopting the above technical solution, it can be ensured that the temperature of the waste lubricating oil discharged into the drain pipe is within the set range. When the waste lubricating oil is just discharged, it may be affected by the temperature of the equipment and the temperature of the waste lubricating oil may drop. By providing a first temperature sensor in the connecting pipe, once the first temperature sensor detects that the temperature of the waste lubricating oil is lower than the set value, the reversing valve is switched to connect with the liquid storage cylinder, and the waste lubricating oil with a temperature lower than the set value is discharged into the liquid storage cylinder again for heating, so as to ensure that the temperature of the waste lubricating oil discharged into the drain pipe can reach the set value.

[0020] As a further improvement, a second temperature sensor is provided inside the liquid storage cylinder, and the second temperature sensor is used to detect the temperature of the waste lubricating oil inside the liquid storage cylinder. When the second temperature sensor detects that the temperature of the waste lubricating oil inside the liquid storage cylinder reaches a set value, the lifting pump extracts the waste lubricating oil.

[0021] As a further improvement, the bottom of the liquid storage cylinder is also threadedly connected with a drain valve, and the drain valve is used to empty the liquid storage cylinder during maintenance and cleaning.

[0022] The beneficial effects of the above technical solution of the present invention are as follows:

[0023] 1. The present invention introduces solar energy for energy supply, which greatly reduces the use of city electricity during the day; and uses city electricity for energy supply at night to avoid wasting electricity generated at night, thereby reducing the electricity expenditure for heating waste lubricating oil.

[0024] 2. The blades of the stirring shaft of the present invention are close to the inner wall of the liquid storage cylinder. When the waste lubricating oil is stirred, the inner wall of the liquid storage cylinder can be cleaned, and the occurrence of coking deposits is basically avoided, thereby improving the heat transfer effect and reducing energy loss.

[0025] 3. Through the cooperation of the first temperature sensor and the reversing valve, once the first temperature sensor detects that the temperature of the waste lubricating oil is lower than the set value, the reversing valve is switched to connect with the liquid storage cylinder, and the waste lubricating oil with a temperature lower than the set value is discharged into the liquid storage cylinder again for heating, so as to ensure that the temperature of the waste lubricating oil discharged into the discharge pipe can reach the set value. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features and advantages of the exemplary embodiments of the present invention will become readily understood. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0027] Figure 1It is a front view of the auxiliary heating device for waste lubricating oil regeneration and distillation of the present invention;

[0028] Figure 2 This is a schematic diagram of the structure of the auxiliary heating device for waste lubricating oil regeneration distillation of the present invention;

[0029] Figure 3 It is a structural schematic diagram of a thermostatic box of the auxiliary heating device for waste lubricating oil regeneration distillation of the present invention.

[0030] Description of reference numerals:

[0031] 1. Insulation layer; 2. Installation cover; 3. Drain pipe; 4. Stirring motor; 5. Liquid inlet pipe; 6. Drain valve; 7. Constant temperature box; 8. Heating sleeve; 9. Liquid storage cylinder; 10. Connecting pipe; 11. Tee pipe; 12. Stirring shaft; 13. Lifting pump. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Those skilled in the art should know that the embodiments described below are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0033] In the prior art, electric heating can heat instantly, has a simple structure, and has a relatively low initial investment cost, and its application is relatively more extensive. However, the energy conversion efficiency of electric heating is relatively low, and the electricity cost is too high, resulting in high operating costs.

[0034] With regard to the above-mentioned problem, the present invention, in terms of energy supply, significantly reduces the use of city electricity during the day by introducing solar energy for energy supply; and uses city electricity for energy supply for production at night to avoid wasting electricity generated at night, thereby reducing the electricity expenditure for heating waste lubricating oil.

[0035] Structurally, the structure of the heating device has been improved, and the lifting pump and the corresponding pipelines are externalized, so that there is no interference in the liquid storage cylinder. The stirring shaft adopts spiral stirring blades, and the blades of the stirring shaft are close to the inner wall of the liquid storage cylinder. When stirring the waste lubricating oil, the inner wall of the liquid storage cylinder can be cleaned, which basically avoids the occurrence of coking deposits, thereby improving the heat transfer effect and reducing energy loss.

[0036] After the external lifting pump and corresponding pipeline structures are installed, in order to prevent the waste lubricating oil from being affected by the equipment temperature when it is just discharged, causing the temperature of the waste lubricating oil to drop, in addition to setting up a constant temperature box to increase the heat exchange area, a first temperature sensor and a reversing valve are also set. Once the first temperature sensor detects that the temperature of the waste lubricating oil is lower than the set value, the reversing valve is switched to connect with the liquid storage cylinder, and the waste lubricating oil with a temperature lower than the set value is discharged into the liquid storage cylinder again for heating, thereby ensuring that the temperature of the waste lubricating oil discharged into the discharge pipe can reach the set value.

[0037] After introducing the basic principle of the present invention, various non-limiting embodiments of the present invention are described in detail below. The number of any element in the drawings is for illustration and not for limitation, and any naming is only for distinction and does not have any limiting meaning.

[0038] The principle and spirit of the present invention are explained in detail below with reference to several representative embodiments of the present invention.

[0039] Example 1 of the waste lubricating oil regeneration distillation auxiliary heating device provided by the present invention:

[0040] like Figure 1-Figure 3 As shown, it includes a liquid storage cylinder 9, a stirring shaft 12 rotatably assembled in the liquid storage cylinder 9 for stirring the waste lubricating oil, and a heating sleeve 8 for heating.

[0041] like Figure 2 As shown, the liquid storage cylinder 9 is used to store waste lubricating oil, and a mounting cover 2 for sealing the liquid storage cylinder 9 is fixedly installed on the top of the liquid storage cylinder 9, and a liquid inlet pipe 5 and a liquid discharge pipe 3 are respectively connected to the mounting cover 2, and the liquid inlet pipe 5 and the liquid discharge pipe 3 both extend into the liquid storage cylinder 9;

[0042] The stirring shaft 12 is rotatably assembled in the liquid storage cylinder 9. A bearing seat is also installed at the bottom of the liquid storage cylinder 9 to improve the stability of the stirring shaft 12. A stirring motor 4 for driving the stirring shaft 12 to rotate is fixedly installed on the mounting cover 2. In this embodiment, the stirring motor 4 is also connected to a reducer to reduce the rotation speed of the stirring shaft 12; the spiral blades of the stirring shaft 12 are in contact with the inner wall of the liquid storage cylinder 9, so that during the rotation of the stirring shaft 12, the attachments on the inner wall of the liquid storage cylinder 9 can be removed in time to avoid further coking and deposition. In addition, after the spiral blades of the stirring shaft 12 are in contact with the inner wall of the liquid storage cylinder 9, the bubbles generated by heating on the inner wall of the liquid storage cylinder 9 can be removed in time during the rotation of the stirring shaft 12 to avoid the bubbles affecting the heat transfer;

[0043] The heating sleeve 8 is sleeved on the liquid storage cylinder 9, and the heating sleeve 8 is used to heat the liquid storage cylinder 9. The heating sleeve 8 is wound with an electric heating wire. When powered on, the resistance wire heats up, thereby heating the waste lubricating oil. In this embodiment, the heating sleeve 8 is connected to the photovoltaic power generation equipment and the mains power equipment respectively, and the photovoltaic power generation is introduced for energy supply, which can greatly reduce the use of mains power during the day, thereby reducing the electricity expenditure for heating the waste lubricating oil; the mains power is to ensure the stability of the equipment operation.

[0044] The lifting pump 13 is installed at the bottom of the liquid storage cylinder 9 . The lifting pump 13 is used to lift the waste lubricating oil. The liquid inlet of the lifting pump 13 extends to the inner bottom of the liquid storage cylinder 9 , and the liquid outlet of the lifting pump 13 is connected to the drain pipe 3 .

[0045] In this embodiment, a heat-insulating layer 1 is further provided on the outside of the heating sleeve 8 to reduce heat loss, and a cavity for accommodating a lifting pump 13 is reserved at the bottom of the heat-insulating layer 1 .

[0046] In the present invention, the heat-insulating layer 1, the heating sleeve 8 and the liquid storage cylinder 9 are independent of each other, so they are convenient for maintenance and replacement.

[0047] like Figure 3 As shown, a groove is provided on the inner wall of the thermal insulation layer 1, and a thermostat 7 is fixedly installed in the groove. The bottom of the thermostat 7 is connected to the lifting pump 13, and the top of the thermostat 7 is connected to the drain pipe 3. The thermostat 7 is a tile-like structure, which fits the heating sleeve 8, and the contact area is relatively larger. The thermostat 7 is embedded in the inner wall of the thermal insulation layer 1, which can ensure that the temperature of the waste lubricating oil when entering the drain pipe 3 is consistent with the temperature in the liquid storage cylinder 9.

[0048] like Figure 2 As shown, a three-way pipe 11 is fixedly connected to the discharge pipe 3, a reversing valve is fixedly installed in the three-way pipe 11, and the thermostatic box 7 is connected to the three-way pipe 11 through a connecting pipe 10, and a first temperature sensor is fixedly installed in the connecting pipe 10.

[0049] When the waste lubricating oil is just discharged, it may be affected by the temperature of the equipment and the temperature of the waste lubricating oil may drop. By providing a first temperature sensor in the connecting pipe 10, once the first temperature sensor detects that the temperature of the waste lubricating oil is lower than the set value, the reversing valve is switched to connect with the liquid storage cylinder 9, and the waste lubricating oil with a temperature lower than the set value is discharged into the liquid storage cylinder 9 again for heating, thereby ensuring that the temperature of the waste lubricating oil discharged into the discharge pipe 3 can reach the set value.

[0050] In this embodiment, a second temperature sensor is provided inside the liquid storage cylinder 9, and the second temperature sensor is used to detect the temperature of the waste lubricating oil inside the liquid storage cylinder 9. When the second temperature sensor detects that the temperature of the waste lubricating oil inside the liquid storage cylinder 9 reaches a set value, the lifting pump 13 extracts the waste lubricating oil.

[0051] In other embodiments, two to three temperature sensors may be disposed inside the liquid storage cylinder 9 to avoid temperature differences of the waste lubricating oil at different locations.

[0052] The bottom of the liquid storage cylinder 9 is also threadedly connected with a drain valve 6, and the drain valve 6 is used to drain the liquid storage cylinder 9 during maintenance and cleaning.

[0053] Although this specification has shown and described a plurality of embodiments of the present invention, it is obvious to those skilled in the art that such embodiments are provided by way of example only. Those skilled in the art will think of many changes, modifications and alternatives without departing from the thought and spirit of the present invention. It should be understood that in the process of practicing the present invention, various alternatives to the embodiments of the present invention described herein may be adopted. The attached claims are intended to define the scope of protection of the present invention, and therefore cover the modular composition, equivalent or alternatives within the scope of protection of these claims.

Claims

1. A waste lubricating oil regeneration distillation auxiliary heating device, characterized in that: include: A liquid storage cylinder (9) is used to store waste lubricating oil. A mounting cover (2) for sealing the liquid storage cylinder (9) is fixedly mounted on the top of the liquid storage cylinder (9). A liquid inlet pipe (5) and a liquid discharge pipe (3) are respectively connected to the mounting cover (2). Both the liquid inlet pipe (5) and the liquid discharge pipe (3) extend into the liquid storage cylinder (9); A stirring shaft (12) is rotatably mounted in the liquid storage cylinder (9), and a stirring motor (4) for driving the stirring shaft (12) to rotate is fixedly mounted on the mounting cover (2); the spiral blades of the stirring shaft (12) are in contact with the inner wall of the liquid storage cylinder (9); A heating sleeve (8) is sleeved on the liquid storage cylinder (9), and the heating sleeve (8) is used to heat the liquid storage cylinder (9); the heating sleeve (8) is connected to the photovoltaic power generation equipment and the mains power equipment respectively; A lifting pump (13) is installed at the bottom of the liquid storage cylinder (9). The lifting pump (13) is used to lift the waste lubricating oil. The liquid inlet of the lifting pump (13) extends to the inner bottom of the liquid storage cylinder (9), and the liquid outlet of the lifting pump (13) is connected to the drain pipe (3).

2. The waste lubricating oil regeneration distillation auxiliary heating device according to claim 1, characterized in that: A heat-insulating layer (1) is also provided on the outside of the heating sleeve (8).

3. The waste lubricating oil regeneration distillation auxiliary heating device according to claim 2, characterized in that: A groove is provided on the inner wall of the thermal insulation layer (1), a thermostatic box (7) is fixedly installed in the groove, the bottom of the thermostatic box (7) is connected to the lifting pump (13), and the top of the thermostatic box (7) is connected to the drainage pipe (3).

4. The waste lubricating oil regeneration distillation auxiliary heating device according to claim 3 is characterized in that: The liquid discharge pipe (3) is fixedly connected to a three-way pipe (11), a reversing valve is fixedly installed in the three-way pipe (11), the thermostatic box (7) is connected to the three-way pipe (11) via a connecting pipe (10), and a first temperature sensor is fixedly installed in the connecting pipe (10).

5. The waste lubricating oil regeneration distillation auxiliary heating device according to claim 4, characterized in that: A second temperature sensor is arranged inside the liquid storage cylinder (9).

6. The waste lubricating oil regeneration distillation auxiliary heating device according to claim 1, characterized in that: The bottom of the liquid storage cylinder (9) is also threadedly connected with a drain valve (6).

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