An equipment for comprehensive utilization of waste mineral oil

Abstract

The present invention belongs to the technical field of waste mineral oil regeneration, and specifically relates to a comprehensive utilization device for waste mineral oil, including a cylinder body with a chamber formed inside. The upper end face of the cylinder body is fixedly connected with an upper end cover, and the lower end face is fixedly connected with a lower end cover. On opposite sides of the outer surface of the upper end cover, there are respectively fixedly connected a condensation pipeline and an oil inlet pipe that communicate with the chamber. Below the lower end cover, there is fixedly connected an oil outlet pipe that penetrates into the interior of the lower end cover. Inside the chamber of the cylinder body, there is connected an evaporation assembly for distilling waste mineral oil, and below the evaporation assembly, there is connected an energy connection assembly for providing power. The present invention solves the technical problem that the current vacuum thin-film evaporation cylinder has poor heating and decompression distillation effects.

Description

Technical Field

[0001] The present invention belongs to the technical field of waste mineral oil regeneration, and specifically relates to a comprehensive utilization device for waste mineral oil. Background Art

[0002] Currently, the re-refining equipment for waste mineral oil uses the wiped film evaporation process to distill waste mineral oil. The vacuum wiped film evaporation cylinder, as the core equipment of the wiped film evaporation process, is composed of components such as a distributor, a heating wall, a gas-liquid separation chamber, and a wiping blade. The waste mineral oil radially enters the vacuum wiped film evaporation cylinder from above the heating zone, and then is distributed to the surface of the heating wall by the distributor. The rotating wiping blade continuously and evenly scrapes the waste mineral oil on the surface of the heating wall into a liquid film with uniform thickness, which flows downward at high speed in a spiral shape and prevents the liquid film from coking and scaling on the heating wall. The heat transfer efficiency is high, and the residence time is short (about 10 - 50 seconds), thus achieving the effect of distilling waste mineral oil.

[0003] The vacuum wiped film evaporation cylinder adds heat transfer oil in the heating wall to heat the waste oil on the wall surface. However, the thin film of waste oil can only adhere to one side of the heating wall. Therefore, the capacity of waste oil evaporated by wiping film on the heating wall each time is relatively limited, reducing the evaporation rate of waste mineral oil, and thus affecting the distillation efficiency of the vacuum wiped film evaporation cylinder.

[0004] Currently, most methods are to increase the overall circumferential length of the vacuum wiped film evaporation cylinder, thereby increasing the total amount of waste mineral oil distributed to the heating wall by the distributor. However, this will cause the sizes of the other internal components to increase, seriously increasing the cost of the vacuum wiped film evaporation cylinder.

[0005] In view of this, in order to overcome the above technical problems, the present invention is designed and developed a comprehensive utilization device for waste mineral oil, which solves the above technical problems. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to solve the problem that the evaporation capacity of waste mineral oil by the heating wall in the currently used vacuum thin film evaporation cylinder is small each time, resulting in poor distillation rate.

[0007] To achieve the above object, the present invention is realized by the following technical solutions: A waste mineral oil comprehensive utilization device provided by the present invention includes a cylinder body with a chamber opened inside. The upper end surface of the cylinder body is fixedly connected with an upper end cover, and the lower end surface is fixedly connected with a lower end cover. The inner wall slopes of the lower end cover all incline towards the pipe orifice of the oil outlet pipe, making it easier for the distilled waste mineral oil to flow out and preventing the waste mineral oil from accumulating in the lower end cover. On the outer surface of the upper end cover, a condensation pipe and an oil inlet pipe that communicate with the chamber are fixedly connected to opposite sides respectively. A lower end cover is fixedly connected below the lower end cover with an oil outlet pipe that penetrates through to the inside of the lower end cover. An evaporation assembly for double-wall distillation of waste mineral oil is connected inside the chamber of the cylinder body. Both sides of the evaporation assembly can evaporate and distill the waste mineral oil, which can increase the quantity of waste mineral oil evaporated each time.

[0008] Preferably, the evaporation assembly includes:

[0009] A discharge tray, which is a ring with a groove on its upper surface. The discharge tray is slidably connected to a chute opened at a corresponding position on the inner wall of the cylinder body through a sliding rod fixedly connected to its side wall;

[0010] At the lower end surface of the inner groove of the discharge tray, discharge ports that penetrate through to the lower end surface are respectively opened near both side edges. The lower ports of the discharge ports respectively incline towards the inner and outer side walls of the evaporation cylinder. The width of the upper port of the discharge port is greater than that of the lower port, ensuring that the waste mineral oil on the discharge tray can accurately flow onto the inner and outer walls of the evaporation cylinder for evaporation of the waste mineral oil;

[0011] Support rods, which are in a cross-shaped structure and are fixedly connected to the inner ring wall surface of the discharge tray. The support rods can also be set as triangular or rectangular structures. However, in the present invention, the cross structure is adopted according to the requirements and the processing difficulty;

[0012] A fixed shaft, the upper end of which is rotatably connected to the lower end surface of the support rod through a bearing;

[0013] Multiple scraping plates, which are evenly fixedly connected to the outer surface of the fixed shaft. The front end surface of the scraping plate is designed as an arc surface by the present invention. While avoiding rubbing and jamming with the evaporation cylinder, the arc surface can also increase the contact area between the scraping plate and the surface of the evaporation cylinder, making the waste mineral oil evenly distributed on the inner wall of the evaporation cylinder;

[0014] An evaporation cylinder, which is in a cavity structure. The upper end surface of the evaporation cylinder is fixedly connected to the lower end surface of the discharge tray;

[0015] An electric heating wire, which is fixedly connected inside the chamber of the evaporation cylinder;

[0016] Semicircular convex walls, which are evenly fixedly connected to the outer wall of the evaporation cylinder in the circumferential direction;

[0017] An air outlet is provided. The air outlet is opened near the outer edge of the feeding tray, and the lower port of the air outlet is located between the evaporation cylinder and the cylinder body, leaving a gap so that the gas evaporated from the waste mineral oil on the outer wall of the evaporation cylinder can lead to the condensation pipeline through the air outlet.

[0018] Preferably, an energy connection component for providing power is connected below the evaporation component, including:

[0019] A driving motor is fixedly connected to the upper surface of the upper end cover, and the output shaft penetrates through the upper end cover and is fixedly connected to the upper end surface of the internal support rod;

[0020] Two wiring rods, both of the two wiring rods are approximately L-shaped structures. The upper end surfaces of the long rods are respectively fixedly connected to the lower end surface of the evaporation cylinder, and a chamber is opened inside and extends through to the chamber of the evaporation cylinder;

[0021] Two conductive parts, the two conductive parts are respectively fixedly connected to the opposite end surfaces of the short rods of the two wiring rods. Commonly used conductive parts in the market include carbon brushes and copper brushes. In the present invention, carbon brushes with stronger conductivity are used to ensure the stability of power transmission;

[0022] A wiring pipe, the upper end surface of the wiring pipe corresponds to directly below the fixed shaft, is bent and penetrates through the lower end cover and extends to the outside of the cylinder body. The inside of the wiring pipe is a cavity structure;

[0023] The oil outlet pipe is located on the front side of the position where the wiring pipe is located;

[0024] A slip ring, the slip ring is sleeved on the surface corresponding to the wiring pipe and the conductive part;

[0025] The slip ring and the conductive part are closely attached to each other, and the slip ring is electrically connected to an external power supply;

[0026] The conductive part is electrically connected to the heating wire.

[0027] Preferably, heat insulation and heat preservation cotton is fixedly connected inside the cylinder body.

[0028] Preferably, a protective shell is fixedly connected to the wiring pipe at the position of the slip ring, and the wiring rod is slidably connected to the protective shell.

[0029] The beneficial effects of the present invention are as follows:

[0030] 1. Through the design of the evaporation component, the present invention realizes that both the inner and outer walls of the evaporation cylinder can evaporate and distill waste mineral oil. Compared with the prior art, without increasing the size of the evaporation cylinder, it has the advantages of storing the waste mineral oil transported by the inlet oil pipe and increasing the amount of waste oil for each wiped film evaporation by accelerating the cloth feeding speed, thereby improving the rate of waste mineral oil distillation;

[0031] 2. Through the mutual cooperation of the energy connection component and the evaporation component, the present invention realizes the power supply to the evaporation component, can continuously supply power to the heating wire while ensuring the rotational operation of the evaporation component, and ensures the stable heating operation of the heating wire. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The present invention will be further described below with reference to the accompanying drawings.

[0033] Figure 1 is the main diagram of the present invention;

[0034] Figure 2 is the present invention Figure 1 front view;

[0035] Figure 3 is the present invention Figure 2 sectional view from the A-A perspective;

[0036] Figure 4 is the present invention Figure 3 enlarged view at B;

[0037] Figure 5 is the present invention Figure 3 enlarged view at C;

[0038] Figure 6 is the top view of the scraping film plate of the present invention;

[0039] Figure 7 is the sectional view of the evaporation cylinder and the semi-circular convex wall of the present invention;

[0040] In the figure: cylinder body 1, drive motor 11, heat insulation and thermal insulation cotton 12, upper end cover 2, oil inlet pipe 21, condensation pipe 22, lower end cover 3, oil outlet pipe 31, wiring pipe 32, discharge tray 4, discharge port 41, support rod 42, air outlet 43, scraping film plate 5, fixed shaft 51, evaporation cylinder 6, heating wire 61, semi-circular convex wall 63, wiring rod 62, conductive part 7, slip ring 8, protective shell 81. DETAILED DESCRIPTION OF THE INVENTION

[0041] In order to make the technical means, creative features, achieved purposes and effects of the present invention more clearly understood, several specific embodiments are listed below to further elaborate on the present invention.

[0042] The present invention provides a waste mineral oil comprehensive utilization device, including a cylinder body 1 with a chamber opened inside, an upper end cover 2 fixedly connected to the upper end surface of the cylinder body 1, and a lower end cover 3 fixedly connected to the lower end surface. On the outer surface of the upper end cover 2, a condensation pipe 22 and an oil inlet pipe 21 communicating with the chamber are respectively fixedly connected to opposite sides. Below the lower end cover 3, an oil outlet pipe 31 penetrating through the lower end cover 3 is fixedly connected. An evaporation component for double-wall distillation of waste mineral oil is connected inside the chamber of the cylinder body 1.

[0043] During the working process, the waste mineral oil processed in the heating zone is transported to the inside of the evaporation assembly through the inlet pipe 21. The evaporation assembly spreads a large amount of incoming waste oil while performing film scraping evaporation on the spread waste oil. The two processes are carried out simultaneously. Part of the waste oil that just enters the evaporation assembly will immediately flash vaporize and be discharged from the condensation pipe 22 of the upper end cover 2 into the subsequent condensation zone. The waste oil to be processed moves downward under the action of gravity and forms a thin film under the influence of the film scraping evaporation process in the evaporation assembly, causing a part of it to be heated and vaporized into vapor and transmitted upward and discharged from the condensation pipe 22. The unevaporated waste oil flows into the lower end cover 3 and flows out from the outlet pipe 31. In this way, the evaporation assembly can increase the quantity of waste oil to be distilled each time, and during the working process, the energy connection assembly will continuously supply power to the evaporation assembly to ensure the normal progress of the distillation work of the evaporation assembly.

[0044] As a specific embodiment of the present invention, the evaporation assembly includes:

[0045] A discharge tray 4, the discharge tray 4 is a ring with a groove on its upper surface, and the discharge tray 4 is slidably connected to the corresponding position of the inner wall of the cylinder 1 through a sliding rod fixedly connected to its side wall;

[0046] At the lower end surface of the inner groove of the discharge tray 4, discharge ports 41 penetrating through to the lower end surface are respectively provided near both side edges;

[0047] Support rods 42, the support rods 42 are in a cross-shaped structure and are fixedly connected to the inner ring wall surface of the discharge tray 4;

[0048] A fixed shaft 51, the upper end of the fixed shaft 51 is rotatably connected to the lower end surface of the support rod 42 through a bearing;

[0049] A plurality of film scraping plates 5, the plurality of film scraping plates 5 are uniformly fixedly connected to the outer surface of the fixed shaft 51;

[0050] An evaporation cylinder 6, the evaporation cylinder 6 has a cavity structure, and the upper end surface of the evaporation cylinder 6 is fixedly connected to the lower end surface of the discharge tray 4;

[0051] A heating wire 61, the heating wire 61 is fixedly connected in the cavity of the evaporation cylinder 6;

[0052] Semicircular convex walls 63, the semicircular convex walls 63 are uniformly fixedly connected to the outer wall of the evaporation cylinder 6 in the circumferential direction.

[0053] An air outlet 43, the air outlet 43 is provided near the outer edge of the discharge tray 4, and the lower port is located between the evaporation cylinder 6 and the cylinder 1.

[0054] The driving energy connection component supplies power to the evaporation component to make it operate, so that the heating wire 61 in the evaporation cylinder 6 starts to heat and work, causing the temperature inside the cylinder body 1 to rise. Thus, after the waste oil transported by the inlet oil pipe 21 falls into the groove of the rotating discharge tray 4, a part of the waste oil will immediately evaporate into gas and rise to be discharged from the condensation pipeline 22. The unevaporated waste oil flows downward through the discharge port 41 and follows the inner and outer side walls of the evaporation cylinder 6 that rotates with the discharge tray 4. The rotating discharge tray 4 enables the incoming waste oil to be evenly distributed in the groove, and combined with the gravity of the waste oil itself, the waste oil can evenly flow towards the evaporation cylinder 6, preventing the waste mineral oil from accumulating on the discharge tray 4 at the inlet oil pipe 21 and preventing uneven distribution of the oil volume on the side wall of the evaporation cylinder 6. Due to the factors of its own weight and the rotation speed of the evaporation cylinder 6, the waste oil advances spirally downward along the inner and outer side walls of the evaporation cylinder 6. And the waste oil on the surface of the inner heating wall of the evaporation cylinder 6 is continuously scraped by the internal stationary scraping plate 5 so that the waste oil can form a turbulent thin film on the inner heating wall. The outer heating wall will throw the waste oil onto the inner wall of the cylinder body 1 through the centrifugal force of rotation, and then the semicircular convex wall 63 scrapes the waste oil on the surface to form a thin film together, resulting in strong heat transfer and mass transfer of the oil films on both sides of the evaporation cylinder 6. During this process, the rotating evaporation cylinder 6 cooperates with the scraping plate 5 and the semicircular convex wall 63 to ensure the uniformity and continuity of the oil film. The long-term operation of the heating wire 61 and the heat transfer of the semicircular convex wall 63 enable the temperature of the inner wall of the cylinder body 1 to reach the temperature required for the evaporation of the oil film, preventing the oil film from coking and scaling on the heating wall. Therefore, when the oil film is heated by the heating wire 61 in the evaporation cylinder 6 to a certain temperature, it will be heated and evaporated to form a steam flow that rises and flows into the condensation pipeline 22 to achieve the purpose of distillation. The steam on the inner side can directly rise from the hollow middle part of the discharge tray 4, and the steam between the gap of the evaporation cylinder 6 and the cylinder body 1 flows out through the air outlet 43, while the unevaporated oil film continues to advance downward until it flows out from the oil outlet pipe 31 of the lower end cover 3. In this way, by simultaneously performing scraping film evaporation on both sides of the evaporation cylinder 6 for the waste oil, compared with the existing single-sided operation, the quantity of waste oil treatment can be increased once, thereby shortening the time required for distillation of the same capacity of waste mineral oil to be treated and improving the working efficiency of the vacuum thin film evaporation cylinder 6.

[0055] As a specific implementation manner of the present invention, an energy connection component for providing power is connected below the evaporation component, including:

[0056] A driving motor 11, the driving motor 11 is fixedly connected to the upper surface of the upper end cover 2, and the output shaft penetrates through the upper end cover 2 and is fixedly connected to the upper end surface of the internal support rod 42;

[0057] Two wiring rods 62, both of the two wiring rods 62 are in an approximately L-shaped structure, the upper end surfaces of the long rods are respectively fixedly connected to the lower end surface of the evaporation cylinder 6, and a chamber is opened inside and extends through to the chamber of the evaporation cylinder 6;

[0058] Two conductive members 7, and the two conductive members 7 are respectively fixedly connected to the opposite end faces of the short rods of the two wiring rods 62;

[0059] A wiring pipe 32, the upper end face of the wiring pipe 32 corresponds to being directly below the fixed shaft 51, and is bent and penetrates through the lower end cover 3 to extend to the outside of the cylinder body 1. The inside of the wiring pipe 32 is a cavity structure;

[0060] The oil outlet pipe 31 is located on the front side of the position where the wiring pipe 32 is located;

[0061] A slip ring 8, and the slip ring 8 is sleeved on the surface of the wiring pipe 32 corresponding to the conductive member 7;

[0062] The slip ring 8 and the conductive member 7 are in close contact with each other, and the slip ring 8 is electrically connected to an external power supply;

[0063] The conductive member 7 is electrically connected to the heating wire 61.

[0064] Before the evaporation assembly works, the energy connection assembly needs to be started in advance. At this time, the drive motor 11 works to drive the output shaft to rotate, driving the discharge tray 4 fixedly connected to the support rod 42 to rotate. At the same time, the evaporation cylinder 6 fixedly connected to the discharge tray 4 also rotates, so as to ensure that the waste oil can be scraped for film. At the same time, the wiring rod 62 below rotates around the wiring pipe 32, and the two conductive members 7 on both sides will always be in frictional contact with the slip ring 8. Thus, the slip ring 8 is electrically connected to an external power supply through a wire, and the conductive member 7 is electrically connected to the heating wire 61 in the evaporation cylinder 6 together. Therefore, after being powered on, when the evaporation cylinder 6 rotates, the heating wire 61 in the chamber can continuously heat and work. And the wiring pipe 32 is fixed. The lower end of the fixed shaft 51 of the scraping plate 5 is fixedly connected to the upper end face of the wiring pipe 32, and the upper end is rotatably connected to the support rod 42 through a bearing. Furthermore, it is ensured that the scraping plate 5 does not rotate when the discharge tray 4 and the evaporation cylinder 6 rotate. In summary, it can be ensured that the heating wire 61 can continuously and stably work when the evaporation assembly is working.

[0065] As a specific implementation manner of the present invention, the lower ports of the discharge ports 41 are respectively inclined and close to the inner and outer side walls of the evaporation cylinder 6, and the width of the upper ports of the discharge ports 41 is greater than that of the lower ports.

[0066] After the waste oil enters the discharge tray 4 from the oil inlet pipe 21, it flows along the discharge port 41 to the evaporation cylinder 6. The cross section of the discharge port 41 is similar to a funnel shape, which can prevent the waste oil in the groove of the discharge tray 4 from accumulating there due to too slow flow rate. The aperture that becomes smaller from large can accelerate the flow rate of the waste oil, and the lower ports of the discharge ports 41 are close to the inner and outer sides of the evaporation cylinder 6, which can ensure that the discharged waste oil can be dripped onto the evaporation cylinder 6 in time, preventing the waste oil from splashing, which will cause resource loss on the one hand and aggravate the pollution degree of the internal components on the other hand. To a certain extent, it also shortens the time required for the waste oil to be prepared for scraping and evaporation work.

[0067] As a specific embodiment of the present invention, the inner wall slopes of the lower end cover 3 all incline towards the nozzle of the oil outlet pipe 31.

[0068] The waste oil that has not been evaporated at the end of the wiped film evaporation process will flow into the lower end cover 3. Since the oil outlet pipe 31 is not the lowest point of the lower end cover 3, the design with the inner wall slope inclining towards the nozzle of the oil outlet pipe 31 can facilitate the outflow of the waste oil and prevent the waste oil from accumulating in the lower end cover 3.

[0069] As a specific embodiment of the present invention, a heat-insulating and heat-preserving cotton 12 is fixedly connected inside the cylinder body 1.

[0070] Installing the heat-insulating and heat-preserving cotton 12 inside the cylinder body 1 can prevent the temperature inside the cylinder body 1 from being transmitted to the outer shell wall through heat insulation. Moreover, the inner wall shell of the cylinder body 1 can continuously heat up until the temperature is consistent under the influence of the heating wire 61. Therefore, the heat-preserving property of the heat-insulating and heat-preserving cotton 12 can further ensure that the temperature of the inner wall of the cylinder body 1 will not be dissipated, thereby ensuring the heating of the oil film on the surface and guaranteeing the distillation effect of the oil film.

[0071] As a specific embodiment of the present invention, the front end face of the wiping film plate 5 is an arc surface.

[0072] The front end face of the wiping film plate 5 is set as an arc, so that its contact surface can fully contact the inner wall surface of the evaporation cylinder 6, thereby making the thin film formed by the waste oil on the inner wall more uniform and reducing the risk of oil film coking and scaling.

[0073] As a specific embodiment of the present invention, a protective shell 81 is fixedly connected to the wiring pipe 32 at the position of the slip ring 8, and the wiring rod 62 is slidably connected to the protective shell 81.

[0074] The protective shell 81 wraps the slip ring 8 and the conductive part 7, which can increase the sealing performance of the two, prevent the dropped waste oil from dripping onto the slip ring 8 and the conductive part 7, and since the waste oil will be directly thrown towards the inner wall of the lower end cover 3 under the action of the centrifugal force generated by the rotation of the evaporation cylinder 6 when it descends, the risk of being dripped by the waste oil can be avoided. Moreover, the sliding connection between the wiring rod 62 and the protective shell 81 can, on the one hand, improve the supporting force of the evaporation cylinder 6, and on the other hand, reduce the hollow area of the protective shell 81, further reducing the risk of being dripped by the oil droplets.

[0075] As a specific embodiment of the present invention, the conductive part 7 is selected as a carbon brush.

[0076] The carbon brush will not have problems such as an increase in frictional force like that of the metal conductive part 7 rubbing against the slip ring 8 for conduction, and the contact position may sinter together. The carbon brush has good performance, can quickly form a uniform, appropriate and stable oxide film on the surface of the slip ring 8, has a long service life, does not wear the slip ring 8, has good commutation and current collection performance, suppresses the spark within the allowable range, has low energy loss, and does not overheat during operation.

[0077] Working principle: The driving energy connection component powers the evaporation component to make it operate, causing the heating wire 61 in the evaporation cylinder 6 to start heating, increasing the temperature inside the cylinder body 1. Thus, after the waste oil transported by the inlet pipe 21 falls into the grooves of the rotating feeding tray 4, a part of the waste oil will immediately evaporate into gas and rise to be discharged through the condensation pipe 22. The unevaporated waste oil flows downward through the discharge port 41 and follows the rotation of the feeding tray 4 to the inner and outer side walls of the evaporation cylinder 6. The rotating feeding tray 4 enables the incoming waste oil to be evenly distributed in the grooves, allowing the waste oil to flow evenly onto the evaporation cylinder 6 to prevent uneven distribution of the oil volume on the side wall of the evaporation cylinder 6. Due to the factors of its own weight and the rotation speed of the evaporation cylinder 6, the waste oil advances downward in a spiral shape along the inner and outer side walls of the evaporation cylinder 6. Moreover, the waste oil on the surface of the inner heating wall of the evaporation cylinder 6 is continuously scraped by the internally fixed scraping plate 5, enabling the waste oil to form a turbulent thin film on the inner heating wall. The outer heating wall will throw the waste oil onto the inner wall of the cylinder body 1 through the centrifugal force of rotation, and then the semi-circular convex wall 63 scrapes the waste oil on the surface to form a thin film together, resulting in strong heat and mass transfer of the oil films on both the inner and outer sides of the evaporation cylinder 6. During this process, the rotating evaporation cylinder 6 cooperates with the scraping plate 5 and the semi-circular convex wall 63 to ensure the uniformity and continuity of the oil film. The long-term operation of the heating wire 61 and the heat transfer of the semi-circular convex wall 63 enable the temperature of the inner wall of the cylinder body 1 to reach the temperature required for the evaporation of the oil film, preventing coking and scaling of the oil film on the heating wall. Therefore, when the oil film is heated by the heating wire 61 in the evaporation cylinder 6 to a certain temperature, it will be heated and evaporated to form a steam flow that rises and flows into the condensation pipe 22 to achieve the purpose of distillation. The steam on the inner side can directly rise from the hollow middle of the feeding tray 4, while the steam between the gap of the evaporation cylinder 6 and the cylinder body 1 flows out through the air outlet 43. The unevaporated oil film continues to advance downward until it flows out through the oil outlet pipe 31 of the lower end cover 3. In this way, compared with the existing single-sided operation, the waste oil is subjected to scraping film evaporation on both the inner and outer sides of the evaporation cylinder 6, which can increase the quantity of waste oil processed at one time, thereby shortening the time required for distilling the same volume of waste mineral oil to be processed and improving the working efficiency of the vacuum thin film evaporation cylinder 6.Before the evaporation component works, the energy connection component needs to be started in advance. At this time, the driving motor 11 works to drive the output shaft to rotate, driving the discharge tray 4 fixedly connected to the support rod 42 to rotate. At the same time, the evaporation cylinder 6 fixedly connected to the discharge tray 4 also rotates, so as to ensure that the waste oil cloth can be scraped for film. At the same time, the wiring rod 62 below rotates around the wiring pipe 32, and the conductive parts 7 on both sides will always be in frictional contact with the slip ring 8. Thus, the external power supply is electrically connected to the slip ring 8 through a wire, and the conductive part 7 is electrically connected to the heating wire 61 in the evaporation cylinder 6 together. Thus, it is ensured that after power-on, the heating wire 61 in the chamber can continuously heat and work when the evaporation cylinder 6 rotates. And the wiring pipe 32 is fixed. The lower end of the fixed shaft 51 of the scraping plate 5 is fixedly connected to the upper end face of the wiring pipe 32, and the upper end is rotatably connected to the support rod 42 through a bearing. Furthermore, it is ensured that the scraping plate 5 does not rotate when the discharge tray 4 and the evaporation cylinder 6 rotate. In summary, it can be ensured that the heating wire 61 can continuously and stably work when the evaporation component works.

[0078] In summary, the basic principle, main features and advantages of the present invention have been described. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents. Without departing from the spirit and scope of the invention, changes and improvements made to the present invention are all included in the scope of protection claimed.

Claims

1. A method for evaporative distillation of waste mineral oil. The equipment used in the evaporative distillation method includes a cylinder body (1) with a chamber opened inside. The upper end face of the cylinder body (1) is fixedly connected with an upper end cover (2), and the lower end face is fixedly connected with a lower end cover (3). On the outer surfaces of the opposite sides of the upper end cover (2), a condensation pipeline (22) and an oil inlet pipe (21) that communicate with the chamber are fixedly connected respectively. Below the lower end cover (3), an oil outlet pipe (31) that penetrates through to the inside of the lower end cover (3) is fixedly connected. It is characterized in that: An evaporation assembly for double-wall distillation of waste mineral oil is connected inside the chamber of the cylinder body (1); The evaporation assembly includes: a feeding tray (4). The feeding tray (4) is a circular ring with a groove opened on the upper surface. The feeding tray (4) is slidably connected with a chute opened at a corresponding position on the inner wall of the cylinder body (1) through a sliding rod fixedly connected to the side wall; On the lower end face of the inner groove of the feeding tray (4), discharge ports (41) that penetrate through to the lower end face are respectively opened near the two side edges; Support rods (42). The support rods (42) are in a cross-shaped structure and are fixedly connected to the inner ring wall surface of the feeding tray (4); A fixed shaft (51). The upper end of the fixed shaft (51) is rotatably connected to the lower end face of the support rod (42) through a bearing; Multiple scraping plates (5). Multiple scraping plates (5) are uniformly fixedly connected to the outer surface of the fixed shaft (51); An evaporation cylinder (6). The evaporation cylinder (6) has a cavity structure. The upper end face of the evaporation cylinder (6) is fixedly connected to the lower end face of the feeding tray (4); A heating wire (61). The heating wire (61) is fixedly connected inside the chamber of the evaporation cylinder (6); Semicircular convex walls (63). The semicircular convex walls (63) are uniformly fixedly connected to the outer wall of the evaporation cylinder (6) in the circumferential direction; An air outlet (43). The air outlet (43) is opened near the outer edge of the feeding tray (4), and the lower port of the air outlet (43) is located between the evaporation cylinder (6) and the cylinder body (1); An energy connection assembly for providing power is connected below the evaporation assembly, including: a driving motor (11). The driving motor (11) is fixedly connected to the upper surface of the upper end cover (2), and the output shaft penetrates through the upper end cover (2) and is fixedly connected to the upper end face of the internal support rod (42); Two wiring rods (62). Both of the two wiring rods (62) are in an approximately L-shaped structure. The upper end faces of the long rods are respectively fixedly connected to the lower end face of the evaporation cylinder (6), and a chamber is opened inside and extends through to the chamber of the evaporation cylinder (6); Two conductive members (7). The two conductive members (7) are respectively fixedly connected to the opposite end faces of the short rods of the two wiring rods (62); A wiring pipe (32). The upper end face of the wiring pipe (32) corresponds directly below the fixed shaft (51), is bent and penetrates through the lower end cover (3) and extends to the outside of the cylinder body (1). The inside of the wiring pipe (32) is a cavity structure; The oil outlet pipe (31) is located on the front side of the position where the wiring pipe (32) is located; A slip ring (8). The slip ring (8) is sleeved on the surface of the wiring pipe (32) corresponding to the conductive member (7); The slip ring (8) and the conductive member (7) are in close contact, and the slip ring (8) is electrically connected to an external power source; The conductive member (7) is electrically connected to the heating wire (61); The lower ports of the discharge ports (41) are respectively inclined and close to the inner and outer side walls of the evaporation cylinder (6); The width of the upper port of the discharge port (41) is greater than that of the lower port; The inner wall slopes of the lower end cover (3) are all inclined towards the nozzle of the oil outlet pipe (31); A heat insulation and heat preservation cotton (12) is fixedly connected inside the cylinder body (1); The front end face of the scraping film plate (5) is an arc surface; A protective shell (81) is fixedly connected to the wiring pipe (32) at the position of the slip ring (8), and the wiring rod (62) is slidably connected to the protective shell (81); The conductive part (7) is selected as a carbon brush; After the waste oil transported by the oil inlet pipe (21) falls into the groove of the rotating feeding tray (4), a part of the waste oil will immediately evaporate into gas and rise to be discharged through the condensation pipeline (22). The unevaporated waste oil flows downward through the discharge port (41) and follows the inner and outer side walls of the evaporation cylinder (6) that rotates with the feeding tray (4). The rotating feeding tray (4) enables the fed waste oil to be evenly distributed in the groove, and combined with the gravity of the waste oil itself, the waste oil can flow evenly towards the evaporation cylinder (6), avoiding the accumulation of waste mineral oil on the feeding tray (4) at the oil inlet pipe (21), preventing uneven distribution of the oil volume on the side wall of the evaporation cylinder (6). Due to the factors of the self-weight of the waste oil and the rotation speed of the evaporation cylinder (6), the waste oil advances spirally downward along the inner and outer side walls of the evaporation cylinder (6). And the waste oil on the inner heating wall surface of the evaporation cylinder (6) is continuously scraped by the scraping film plate (5) fixed inside, so that the waste oil can form a turbulent thin film on the inner heating wall. The waste oil on the outer heating wall will be thrown onto the inner wall of the cylinder body (1) by the centrifugal force of rotation, and then a thin film will be formed by scraping the waste oil on the surface by the semi-circular convex wall (63). As a result, strong heat transfer and mass transfer occur between the oil films on the inner and outer sides of the evaporation cylinder (6). During this process, the rotating evaporation cylinder (6) cooperates with the scraping film plate (5) and the semi-circular convex wall (63) to ensure the uniformity and continuity of the oil film. The long-term operation of the heating wire (61) and the heat transfer of the semi-circular convex wall (63) enable the temperature of the inner wall of the cylinder body (1) to reach the temperature required for the evaporation of the oil film, preventing coking and scaling of the oil film on the heating wall. Therefore, when the oil film is heated to a certain temperature by the heating wire (61) inside the evaporation cylinder (6), it will be heated and evaporated to form a steam flow that rises and flows into the condensation pipeline (22) to achieve the purpose of distillation. The steam on the inner side directly rises from the hollow middle part of the feeding tray (4), and the steam between the gap of the evaporation cylinder (6) and the cylinder body (1) flows out through the air outlet (43), while the unevaporated oil film continues to advance downward until it flows out from the oil outlet pipe (31) of the lower end cover (3).

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