Electromagnetic heating system of waste oil conveying pipeline

Abstract

The invention relates to the technical field of waste oil heating, in particular to an electromagnetic heating system of a waste oil conveying pipeline, and aims to solve the problem that in the prior art, the heating temperature of waste oil is not uniform, and coking is easily generated in the pipeline. Comprising an oil reservoir; the oil delivery pipe is communicated with the oil storage pool, and the bottom of the oil delivery pipe is communicated with an oil discharge pipe; a heating coil; the decoking mechanism is coaxially arranged in the oil conveying pipe, and the end, away from the oil storage pool, of the decoking mechanism is connected with a driving mechanism; wherein the heating coil is used for uniformly heating the oil conveying pipe, and the driving mechanism is used for driving the decoking mechanism to reciprocate along the axis direction of the oil conveying pipe or driving the decoking mechanism to rotate along the circumferential direction of the oil conveying pipe. The heating coil wound on the peripheral wall of the oil conveying pipe can uniformly heat oil in the oil conveying pipe, coking caused by local overheating is avoided, meanwhile, the decoking mechanism can continuously enable the oil in the oil conveying pipe to flow, and coking caused by the fact that the oil stays in a certain area for a long time is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of waste oil heating, and in particular to an electromagnetic heating system for a waste oil conveying pipeline. Background Art

[0002] With the increasing number of motor vehicles and machinery in my country, lubricant consumption is enormous. my country is the world's third-largest lubricant consumer, after the United States and Russia. In recent years, annual lubricant consumption has exceeded 8 million tons. This significant amount of waste lubricant oil, a hazardous waste, is generated annually by the replacement of vehicles and equipment. As such, waste lubricant oil requires proper disposal. With increasingly stringent environmental regulations, the recycling and reuse of waste lubricant oil is gaining increasing attention. Internationally, waste lubricant regeneration processes are categorized into three categories: repurification, refining, and rerefining, depending on the degree of deterioration and the intended use of the recycled product. To meet increasingly stringent environmental regulations, rerefining, aimed at producing high-quality Group II and III base oils, is the mainstream approach to waste lubricant regeneration. Rerefining is a process that incorporates hydrogenation and other processes into repurification. Slurry bed hydrogenation is currently one of the preferred processes for processing waste lubricant oil by major waste lubricant regeneration companies. Specifically, waste oil, a molybdenum-based catalyst, and hot hydrogen are mixed and introduced into the bottom of a slurry bed reactor for a demetallization reaction.

[0003] The failure of waste lubricating oil is caused by pollution, loss of additives and a small amount of deterioration of base oil. Although its properties have changed somewhat, its composition is still mainly base oil and additives. Impurities in waste lubricating oil only account for 10% to 25%, mainly concentrated in the polar compound fraction. When waste lubricating oil is heated to 150°C, its internal additives will generate coking precursors, and coking is extremely severe after 230°C. Since traditional hydrogenation units use cylindrical furnaces for heating and natural gas as raw material, in order to make the waste oil meet the process requirements, the temperature in the furnace needs to be 650°C, causing local overheating of the furnace tubes. The waste oil is very easy to coke in the furnace tubes. As the furnace tubes coke, in order to maintain the reaction temperature, the furnace temperature must be increased, and the coking speed will become faster. This vicious cycle means that the longest operating period of the waste oil regeneration unit does not exceed 3 months. The furnace tubes are blocked due to coking and cannot produce normally. The unit can only be shut down for decoking of the furnace tubes. Not only is the economic benefit of the enterprise low, but the safety and environmental risks brought to the company by start-up, shutdown, inspection and maintenance are also very large. There is an urgent need for a new heating method to replace the traditional industrial heating furnace to solve the problem of waste oil heating being easy to coke. Summary of the Invention

[0004] The technical problem to be solved by the present invention is that when waste oil is heated, coking is easily generated in the pipeline and it is difficult to clean it later. The purpose is to provide an electromagnetic heating system for waste oil transportation pipelines, which can heat the pipelines evenly and continuously and reduce the formation of coking on the inner wall of the pipeline.

[0005] The present invention is achieved through the following technical solutions: An electromagnetic heating system for a waste oil conveying pipeline, comprising: oil storage tanks; An oil delivery pipe, the oil delivery pipe is connected to the oil storage tank, and the bottom of the oil delivery pipe is connected to an oil drain pipe; a heating coil, the heating coil being wound on the outer peripheral wall of the oil pipeline and electrically connected to an electromagnetic heater and a PLC controller; a decoking mechanism, the decoking mechanism being coaxially disposed in the oil pipeline, and the end of the decoking mechanism away from the oil reservoir being connected to a driving mechanism; The heating coil is used to uniformly heat the oil pipeline, and the driving mechanism is used to drive the decoking mechanism to reciprocate along the axial direction of the oil pipeline, or to drive the decoking mechanism to rotate along the circumferential direction of the oil pipeline.

[0006] In the above technical solution, the heating coil wound around the outer wall of the oil pipeline can evenly heat the oil in the pipeline to avoid local overheating and coking. At the same time, the decoking mechanism can continuously allow the oil in the pipeline to flow, preventing the oil from staying in a certain area for too long and causing coking.

[0007] In some optional technical solutions, the decoking mechanism includes several decoking modules and filtering modules, the decoking modules and the filtering modules are equal in shape and size, the filtering module is connected to the driving mechanism, and several of the decoking modules are connected in sequence.

[0008] In the above technical solution, the decoking mechanism is composed of a plurality of decoking modules and a filtering module. This makes it convenient to separately separate the decoking modules and the filtering modules for cleaning during the later cleaning of the decoking mechanism, thereby cleaning the inner wall of the oil pipeline relatively more efficiently.

[0009] In some optional technical solutions, the decoking module has a cylindrical structure, and a first through groove and a second through groove are provided on the outer peripheral walls of the decoking module and the filtering module. The first through groove and the second through groove are symmetrically arranged, and the first through groove and the second through groove are both opened along the axial direction of the oil pipeline. A first scraper is rotatably connected in the first through groove, and a second scraper is slidably connected in the second through groove. The rotation path of the first scraper conflicts with the inner peripheral wall of the oil pipeline, and the movement direction of the second scraper conflicts with the inner peripheral wall of the oil pipeline.

[0010] In the above technical solution, the first scraper and the second scraper can scrape the oil in the area along the first through groove and the second through groove respectively, so as to prevent the oil from accumulating in the area for a long time.

[0011] In some optional technical solutions, a support plate is provided in the middle of the inner cavity of the decoking module and the filtering module, and a slide groove is provided on the support plate along the axial direction of the oil pipeline, and a slide plate is slidably connected in the slide groove, and adjacent slide plates are connected to each other, and the driving mechanism drives the slide plate to slide along the axial direction of the oil pipeline, and racks are symmetrically provided on the upper and lower sides of the slide plate. The decoking module and the filtering module are also fixedly connected with a first rotating shaft and a second rotating shaft on the inner circumferential walls on the upper and lower sides of the slide plate, and the first rotating shaft and the second rotating shaft are respectively rotatably connected with a first gear and a second gear connected to the rack transmission, a first runner is provided on the side of the first gear away from the rack, and a second runner is provided on the side of the second gear away from the rack, the first runner is connected to the first scraper, and the second runner is connected to the second scraper.

[0012] In the above technical solution, the driving mechanism pushes several sliders to slide in sequence, so that the rack drives the first gear and the second gear to rotate, and the first gear and the second gear are respectively connected in sequence to drive the first scraper and the second scraper to move, so that the first gear and the second gear scrape the oil flow.

[0013] In some optional technical solutions, the ends of the first scraper and the second scraper are both arc-shaped, the first gear is located in the lower middle of the first through slot, the second gear is arranged close to one end of the driving mechanism, and the first gear and the second gear rotate in opposite directions.

[0014] In the above technical solution, when the rack slides, the first gear and the second gear rotate in opposite directions and can both scrape toward one side of the driving mechanism to push the oil in the same direction.

[0015] In some optional technical solutions, the first scraper is connected to the first rotor through a connecting rod, the second scraper is connected to the second rotor through a telescopic rod, the second rotor controls the telescopic rod to move toward the driving mechanism, and the length of the telescopic rod gradually becomes shorter, the second scraper is arranged at the end of the telescopic rod away from the second rotor, and the second scraper is perpendicular to the inner circumferential wall of the oil pipeline.

[0016] In the above technical solution, the first rotating wheel and the second rotating wheel are used to drive the first scraper and the second scraper to move and scrape the oil.

[0017] In some optional technical solutions, the first scraper and the second scraper in adjacent decoking modules are symmetrically arranged, and the end of the path of the first scraper in adjacent decoking modules coincides with the starting end of the path of the second scraper.

[0018] In the above technical solution, the first scraper and the second scraper in adjacent decoking modules are arranged in a mirror image, so that the first scraper or the second scraper can scrape away the accumulated oil and impurities to avoid accumulation or backflow.

[0019] In some optional technical solutions, a filter plate is provided at the pipe mouth of the oil discharge pipe located in the oil delivery pipe, and a number of bosses are provided on the side of the first scraper and the second scraper of the filter module close to the driving mechanism. A slag collecting box is also provided between the filter module and the driving mechanism, and the opening of the slag collecting box faces the filter module. The opening of the slag collecting box is arranged close to the filter plate, and the moving paths of the first scraper and the second scraper located on the filter module conflict with the filter plate.

[0020] In the above technical solution, the filter plate is mainly used to filter the oil discharged into the drain pipe, and the filter module is used to push the impurities attached to the filter plate and in the oil into the slag collecting box through the first scraper and the second scraper for collection and storage.

[0021] In some optional technical solutions, the driving mechanism includes a hydraulic cylinder, a clamping chuck and a motor; a through hole is provided in the middle of the slag box for allowing the hydraulic cylinder to pass through; one end of the slide along the length direction is fixedly connected with a buckle; the other end of the slide along the length direction is provided with a slot engaged with the opening; the ends of the decoking module and the filtering module are detachably connected with a cover plate; one end of the decoking module and the filtering module is fixedly connected with a boss; the other end of the decoking module and the filtering module is provided with a groove engaged with the boss; the clamping chuck is used to clamp and fix the slag box and the filtering module; the motor, the hydraulic cylinder and the clamping chuck are electrically connected.

[0022] In the above technical solution, the hydraulic cylinder pushes the slider in the chute to translate, thereby rotating the first scraper and the second scraper. The clamping chuck and the motor are used to drive the filter module and the decoking module to rotate, completing a circle of cleaning work.

[0023] In some optional technical solutions, an insulation pipe is further provided on the outer peripheral wall of the oil pipeline, and the heating coil is located between the insulation pipe and the oil pipeline.

[0024] In the above technical solution, the heating coil is located between the insulation pipe and the oil pipeline, which can reduce heat loss and further make the oil temperature in the oil pipeline more balanced.

[0025] Compared with the prior art, the present invention has the following advantages and beneficial effects: 1. In the present invention, an electromagnetic heater controls the heating coil wound around the outer wall of the oil pipeline to generate heat, thereby stabilizing the oil temperature in the pipeline and preventing local overheating that could cause coking in that area. Furthermore, an insulation tube is provided outside the heating coil to reduce heat loss from the pipeline, further improving the uniformity of the oil temperature and, to a certain extent, reducing the energy consumption of the electromagnetic heater. 2. The decoking mechanism of the present invention includes several interconnected decoking modules and filtering modules. By operating a drive mechanism to control the movement of a slider, the first and second scrapers on the decoking and filtering modules move at different speeds, scraping the oil in the corresponding areas. This prevents the oil from staying in the same area for a long time, thus reducing the time it takes for coking to form. 3. The decoking module and filtration module of the present invention move impurities when the first and second scrapers scrape the oil, thereby forcing the decoking mechanism to come into contact with more impurities, reducing the length of time the oil pipeline is exposed to impurities, and collecting the impurities. In addition, decoking can be performed later by disassembling several connected decoking modules and filtration modules. Compared with decoking on the inner circumference of the oil pipeline, the cleaning efficiency of the decoking mechanism is faster and more cost-effective. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings: Figure 1 The cross-sectional view of the present invention Figure 1 ; Figure 2 The cross-sectional view of the present invention Figure 2 ; Figure 3 Exploded view of the decoking module, filtration module, slag collection box, clamping chuck and hydraulic cylinder in the present invention; Figure 4 is a cross-sectional view of the decoking module of the present invention; Figure 5 Schematic diagram of the structure of two adjacent decoking modules in the present invention; Figure 6 is a cross-sectional view of a decoking module and an adjacent filtration module in the present invention; Figure 7 Schematic diagram of the structure of the filtering module in the present invention; Figure 8 Schematic diagram of the movement paths of the first scraper and the second scraper in the decoking module and the filtering module in the present invention.

[0027] The reference numerals represent: 1. Oil pipeline; 11. Heating coil; 12. Insulation pipe; 13. Oil drain pipe; 131. Filter plate; 2. Decoking module; 21. Slide plate; 22. First gear; 23. Second gear; 24. Connecting rod; 25. Telescopic rod; 3. Filter module; 4. First scraper; 5. Second scraper; 6. Slag box; 7. Clamping chuck; 8. Hydraulic cylinder. DETAILED DESCRIPTION

[0028] To make the objectives, technical solutions, and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the examples and accompanying drawings. The exemplary embodiments of the present invention and their descriptions are only used to explain the present invention and are not intended to limit the present invention. It should be noted that the present invention is already in the actual development and use stage.

[0029] Example 1 like Figures 1 to 8 As shown, this embodiment provides an electromagnetic heating system for a waste oil conveying pipeline, comprising: oil storage tanks; The oil pipeline 1 is connected to the oil storage tank, and the bottom of the oil pipeline 1 is connected to the oil drain pipe 13; A heating coil 11 is wound around the outer wall of the oil pipeline 1 and is electrically connected to an electromagnetic heater and a PLC controller; A decoking mechanism is coaxially arranged in the oil pipeline 1, and a driving mechanism is connected to the end of the decoking mechanism away from the oil reservoir; The heating coil 11 is used to uniformly heat the oil pipeline 1 , and the driving mechanism is used to drive the decoking mechanism to reciprocate along the axis of the oil pipeline 1 , or to drive the decoking mechanism to rotate along the circumferential direction of the oil pipeline 1 .

[0030] like Figures 1 to 7 As shown, the decoking mechanism includes several decoking modules 2 and filtering modules 3. The decoking modules 2 and filtering modules 3 are equal in shape and size. The filtering module 3 is connected to the driving mechanism, and several decoking modules 2 are connected in sequence.

[0031] like Figure 4 and Figure 5 As shown, the decoking module 2 has a cylindrical structure, and a first through groove and a second through groove are provided on the outer peripheral wall of the decoking module 2 and the filtering module 3. The first through groove and the second through groove are symmetrically arranged, and the first through groove and the second through groove are both opened along the axial direction of the oil pipeline 1. The first scraper 4 is rotatably connected in the first through groove, and the second scraper 5 is slidably connected in the second through groove. The rotation path of the first scraper 4 conflicts with the inner peripheral wall of the oil pipeline 1, and the movement direction of the second scraper 5 conflicts with the inner peripheral wall of the oil pipeline 1.

[0032] like Figures 4 to 7As shown, a support plate is provided in the middle of the inner cavity of the decoking module 2 and the filtering module 3, and a slide groove is opened on the support plate along the axial direction of the oil pipeline 1. A slide plate 21 is slidably connected in the slide groove, and adjacent slide plates 21 are connected to each other. The driving mechanism drives the slide plate 21 to slide along the axial direction of the oil pipeline 1, and racks are symmetrically provided on the upper and lower sides of the slide plate 21. The decoking module 2 and the filtering module 3 are also fixedly connected with a first rotating shaft and a second rotating shaft on the inner circumferential walls on the upper and lower sides of the slide plate 21. The first rotating shaft and the second rotating shaft are respectively rotatably connected with a first gear 22 and a second gear 23 connected to the rack transmission. A first runner is provided on the side of the first gear 22 away from the rack, and a second runner is provided on the side of the second gear 23 away from the rack. The first runner is connected to the first scraper 4, and the second runner is connected to the second scraper 5.

[0033] like Figures 4 to 6 As shown, the ends of the first scraper 4 and the second scraper 5 are both arc-shaped, the first gear 22 is located in the middle and lower part of the first through groove, and the second gear 23 is arranged near one end of the driving mechanism. The rotation directions of the first gear 22 and the second gear 23 are opposite.

[0034] like Figures 4 to 6 As shown, the first scraper 4 is connected to the first rotor through a connecting rod 24, and the second scraper 5 is connected to the second rotor through a telescopic rod 25. The second rotor controls the telescopic rod 25 to move toward the driving mechanism, and the length of the telescopic rod 25 gradually becomes shorter. The second scraper 5 is arranged at the end of the telescopic rod 25 away from the second rotor, and the second scraper 5 is perpendicular to the inner circumferential wall of the oil pipeline 1.

[0035] like Figure 1 、 Figure 2 and Figure 5 As shown, the first scraper 4 and the second scraper 5 in adjacent decoking modules 2 are symmetrically arranged, and the end of the path of the first scraper 4 of the adjacent decoking modules 2 coincides with the starting end of the path of the second scraper 5.

[0036] like Figures 1 to 3 As shown, a filter plate 131 is provided at the pipe mouth of the oil discharge pipe 13 located in the oil pipeline 1, and a plurality of bosses are provided on the side of the first scraper 4 and the second scraper 5 of the filter module 3 close to the driving mechanism. A slag collecting box 6 is also provided between the filter module 3 and the driving mechanism. The opening of the slag collecting box 6 faces the filter module 3, and the opening of the slag collecting box 6 is arranged close to the filter plate 131. The moving paths of the first scraper 4 and the second scraper 5 located on the filter module 3 conflict with the filter plate 131.

[0037] like Figures 1 to 3As shown, the driving mechanism includes a hydraulic cylinder 8, a clamping chuck 7 and a motor. A through hole is provided in the middle of the slag collecting box 6 for allowing the hydraulic cylinder 8 to pass through. A clip is fixedly connected to one end of the slide plate 21 along the length direction, and a slot is provided at the other end of the slide plate 21 along the length direction for clamping with the opening. Cover plates are detachably connected to the ends of the decoking module 2 and the filtering module 3. A protrusion is fixedly connected to one end of the decoking module 2 and the filtering module 3, and a groove is provided at the other end of the decoking module 2 and the filtering module 3 for clamping with the protrusion. The clamping chuck 7 is used to clamp and fix the slag collecting box 6 and the filtering module 3. The motor, the hydraulic cylinder 8 and the clamping chuck 7 are electrically connected.

[0038] like Figure 1 and Figure 2 As shown, a heat preservation pipe 12 is further provided on the outer peripheral wall of the oil pipeline 1 , and the heating coil 11 is located between the heat preservation pipe 12 and the oil pipeline 1 .

[0039] Specifically, when processing waste oil, the heating coil 11 is evenly wound on the oil pipeline 1, and the winding length is the effective distance between the connection between the oil pipeline 1 and the oil storage tank and the oil discharge pipe 13. The heating coil 11 is actually a metal heating tube, which is heated by an electromagnetic heater, and the heating temperature of the oil pipeline 1 is controlled by a PLC controller to be in the range of 380-400°C. An insulation tube 12 is also provided outside the heating coil 11, which can be used to insulate the oil pipeline 1 to avoid direct contact between the oil pipeline 1 and the heating coil 11 with the outside world, thereby increasing heat loss. At the same time, the decoking mechanism is located in the oil pipeline 1, that is, the heated oil is located between the heated oil pipeline 1 and the decoking mechanism, further enhancing the insulation effect, that is, the uniform distribution of heat, and reducing the probability of coking caused by local high temperature in the pipeline.

[0040] During the waste oil heating process, the waste oil is poured into the oil storage tank and continuously discharged into the oil pipeline 1 for waste oil treatment. The oil is circulated through the oil pipeline 1, heated, and then discharged through the oil discharge pipe 13. Preferably, valves are provided between the oil storage tank and the oil pipeline 1, and between the oil pipeline 1 and the oil discharge pipe 13. The oil in the oil storage tank can also be temporarily stored and collected, and the waste oil that has entered the oil pipeline 1 can be processed first. When the driving mechanism and the oil pipeline 1 are arranged in parallel, a sealing mechanism should be provided between the driving mechanism and the slag collecting box 6 to prevent oil leakage. When the driving mechanism and the oil pipeline 1 are arranged vertically, the pipe opening where the driving mechanism is located should be higher than the maximum diameter height of the oil pipeline 1.

[0041] During the heating process of the oil in the oil pipeline 1, the driving mechanism is started to control the hydraulic cylinder 8 to push the slider on the filter module 3. The slider on the filter module 3 moves toward the oil reservoir. At the same time, the slider on the filter module 3 pushes the slider on the adjacent decoking module 2 to move together. The hydraulic cylinder 8 is gradually controlled to move until the slider of the decoking module 2 close to the oil reservoir moves. When several sliders move toward the oil reservoir, the racks on the sliders follow the translation. At the same time, the gears drive the first gear 22 and the second gear 23 to rotate respectively. It should be noted that the rotation directions of the first gear 22 and the second gear 23 are opposite. When the first gear 22 rotates, it drives the first runner to follow. The first rotor drives the first scraper 4 to rotate synchronously through the connecting rod 24. Similarly, when the second gear 23 rotates, the telescopic rod 25 is driven to move through the torque transmission, and the second scraper 5 moves horizontally. The movement trajectory of the first scraper 4 is arc-shaped. When the telescopic rod 25 rotates toward the driving mechanism, the second scraper 5 contacts the inner wall of the oil pipeline 1 and contracts, so that the second scraper 5 in contact with the inner wall of the oil pipeline 1 moves parallel. Preferably, the second gear 23 in the decoking module 2 close to the oil storage tank side is arranged close to the side of the driving mechanism. This arrangement can make the length of the telescopic rod 25 change from long to short, thereby increasing the squeezing force of the second scraper 5 on the oil pipeline 1.

[0042] More preferably, the first scraper 4 and the second scraper 5 between adjacent decoking modules 2 are arranged vertically, and the specific oil scraping method is: the first scraper 4 in the first decoking module 2 near the oil storage tank side moves in a curve to scrape the oil to the second scraper 5 of the second decoking module 2, and the second scraper 5 moves horizontally to squeeze the oil scraped by the first scraper 4 in parallel again, so as to crush the large particles of impurities contained in the oil gathered by the first scraper 4, and the first scraper 4 is mainly used to scrape and gather the oil on the pipe wall, so as to facilitate the adjacent second scraper 5 to crush the impurities. The joint function of the first scraper 4 and the second scraper 5 is to prevent the oil on the inner wall of the oil pipeline 1 in this area from gathering for a long time, resulting in coking during heating. The cooperation of the first scraper 4 and the second scraper 5 can make the oil in the oil pipeline 1 flow evenly, avoid gathering in the same area for a long time, or heating in the same area for a long time, thereby greatly slowing down the time for waste oil to coke during the heating process.

[0043] After the hydraulic cylinder 8 completes one feeding movement, it is controlled to retract, and several sliders are restored synchronously. The first gear 22 and the second gear 23 drive the first scraper 4 and the second scraper 5 to restore in the opposite direction, and the oil in the current area is scraped again. In this embodiment, a first scraper 4 and a second scraper 5 are symmetrically arranged on a decoking module 2.

[0044] After the hydraulic cylinder 8 completes one reciprocating motion, the motor can be controlled to drive the clamping chuck 7 to rotate, so that several mutually engaged decoking modules 2 rotate synchronously. Taking the first decoking module 2 near the oil reservoir as an example, the first scraper 4 and the second scraper 5 rotate 45 degrees, the hydraulic cylinder 8 performs another reciprocating motion, and the first scraper 4 and the second scraper 5 repeat the above process. After the clamping chuck 7 rotates a full circle, the decoking module 2 has completed the decoking work in that area. When the same decoking module 2 rotates, the second scraper 5 can also scrape the oil remaining in the blind area of ​​the first scraper 4 during the previous rotation. At the same time, the first scraper 4 can scrape impurities brought back when the second scraper 5 was reset during the previous rotation into the area of ​​the next adjacent decoking module 2. This dynamic decoking method can effectively avoid inadequate cleaning of the same area and the backflow of cleaned impurities.

[0045] The structures of the filter module 3 and the decoking module 2 are completely identical. The only difference is that the filter module 3 is located above the filter plate 131, and a boss is provided on the first scraper 4 and the second scraper 5 on the filter module 3 facing the slag collecting box 6. The movement mode of the filter module 3 is also the same as that of the decoking module 2, which will not be described in detail here. When the first scraper 4 or the second scraper 5 of the filter module 3 moves, it can squeeze the accumulated impurities into the slag collecting box 6 through the boss. Preferably, as shown in FIG. Figure 2 and Figure 3 As shown, a groove is also provided in the slag collecting box 6 for engaging with the boss at the end of the filter module 3, which is used to limit and fix the filter module 3. An annular groove is provided between the outer peripheral wall of the slag collecting box and the groove to collect impurities in the oil. The design of the annular groove can prevent a large amount of impurities from flowing back when the first scraper 4 or the second scraper 5 reciprocates. At the same time, the first scraper 4 and the second scraper 5 on the filter module 3 can also scrape off impurities on the filter plate 131, thereby reducing the impurity content in the oil during subsequent oil drainage.

[0046] like Figure 8 As shown, the thin dot-dash line in the oil pipeline 1 represents the paths of the first scraper 4 and the second scraper 5, the curved line is the moving path of the first scraper 4, the straight line is the moving path of the second scraper 5, and the vertically corresponding paths of the first scraper 4 and the second scraper 5 indicate that they are located in the same decoking module 2, and S represents the scraping area of ​​the longitudinal section of the first scraper 4 and the second scraper 5.

[0047] After the oil in the oil pipeline 1 has undergone multiple movements of the decoking mechanism, the valve between the oil pipeline 1 and the oil discharge pipe 13 can be opened to discharge the processed oil, and then the valve can be closed. At the same time, the valve between the oil storage tank and the oil pipeline 1 can be opened to add new waste oil that needs to be processed for heating treatment. After multiple waste oil heating processes, the decoking mechanism can be pulled out separately and cleaned. Since the decoking mechanism is in constant motion during the heating process and comes into contact with more impurities, there is a greater probability that coke will adhere to the decoking mechanism. The decoking mechanism is composed of several decoking modules 2 and filtering modules 3. The decoking work can be carried out more effectively during cleaning. Compared with the closed oil pipeline 1, the subsequent decoking efficiency and cost can be greatly improved.

[0048] Example 2 This embodiment is another implementation of the embodiment 1, that is, a second scraper 5 is provided in each decoking module 2 and filtering module 3, and the second scraper 5 is used to contact the inner wall of the oil pipeline 1 for scraping.

[0049] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An electromagnetic heating system for waste oil pipeline, characterized in that: include: oil storage tanks; An oil delivery pipe (1), the oil delivery pipe (1) is connected to the oil storage tank, and the bottom of the oil delivery pipe (1) is connected to an oil discharge pipe (13); A heating coil (11), the heating coil (11) being wound on the outer peripheral wall of the oil pipeline (1), the heating coil (11) being electrically connected to an electromagnetic heater and a PLC controller; A decoking mechanism, the decoking mechanism being coaxially arranged in the oil delivery pipe (1), and the end of the decoking mechanism away from the oil storage tank being connected to a driving mechanism; The heating coil (11) is used to uniformly heat the oil pipeline (1), and the driving mechanism is used to drive the decoking mechanism to reciprocate along the axial direction of the oil pipeline (1), or to drive the decoking mechanism to rotate along the circumferential direction of the oil pipeline (1).

2. The electromagnetic heating system for waste oil pipeline according to claim 1, characterized in that: The decoking mechanism comprises a plurality of decoking modules (2) and filtering modules (3); the decoking modules (2) and the filtering modules (3) are of equal shape and size; the filtering module (3) is connected to the driving mechanism; and the plurality of decoking modules (2) are connected in sequence.

3. The electromagnetic heating system for waste oil pipeline according to claim 2, characterized in that: The decoking module (2) has a cylindrical structure. A first through groove and a second through groove are provided on the outer peripheral wall of the decoking module (2) and the filtering module (3). The first through groove and the second through groove are symmetrically arranged. The first through groove and the second through groove are both opened along the axial direction of the oil pipeline (1). A first scraper (4) is rotatably connected in the first through groove, and a second scraper (5) is slidably connected in the second through groove. The rotation path of the first scraper (4) conflicts with the inner peripheral wall of the oil pipeline (1), and the movement direction of the second scraper (5) conflicts with the inner peripheral wall of the oil pipeline (1).

4. The electromagnetic heating system for waste oil pipeline according to claim 3, characterized in that: A support plate is provided in the middle of the inner cavity of the decoking module (2) and the filtering module (3), and a slide groove is provided on the support plate along the axial direction of the oil pipeline (1). A slide plate (21) is slidably connected in the slide groove, and adjacent slide plates (21) are connected to each other. The driving mechanism drives the slide plate (21) to slide along the axial direction of the oil pipeline (1), and racks are symmetrically provided on the upper and lower sides of the slide plate (21). The decoking module (2) and the filtering module (3) are also fixedly connected with a first rotating shaft and a second rotating shaft on the inner peripheral walls on the upper and lower sides of the slide plate (21), and the first rotating shaft and the second rotating shaft are respectively rotatably connected with a first gear (22) and a second gear (23) connected to the rack transmission. A first rotating wheel is provided on the side of the first gear (22) away from the rack, and a second rotating wheel is provided on the side of the second gear (23) away from the rack. The first rotating wheel is connected to the first scraper (4), and the second rotating wheel is connected to the second scraper (5).

5. The electromagnetic heating system for waste oil pipeline according to claim 4, characterized in that: The ends of the first scraper (4) and the second scraper (5) are both arc-shaped, the first gear (22) is located in the lower middle of the first through slot, the second gear (23) is arranged close to one end of the driving mechanism, and the first gear (22) and the second gear (23) rotate in opposite directions.

6. The electromagnetic heating system for waste oil pipeline according to claim 4, characterized in that: The first scraper (4) is connected to the first rotor via a connecting rod (24), and the second scraper (5) is connected to the second rotor via a telescopic rod (25). The second rotor controls the telescopic rod (25) to move toward the driving mechanism, and the length of the telescopic rod (25) gradually shortens. The second scraper (5) is arranged at the end of the telescopic rod (25) away from the second rotor, and the second scraper (5) is perpendicular to the inner peripheral wall of the oil pipeline (1).

7. The electromagnetic heating system for waste oil pipeline according to claim 4, characterized in that: The first scraper (4) and the second scraper (5) in adjacent decoking modules (2) are symmetrically arranged, and the end of the path of the first scraper (4) of the adjacent decoking modules (2) coincides with the start of the path of the second scraper (5).

8. The electromagnetic heating system for waste oil pipeline according to claim 4, characterized in that: The outlet of the oil discharge pipe (13) located in the oil delivery pipe (1) is provided with a filter plate (131), and the first scraper (4) and the second scraper (5) of the filter module (3) are both provided with a plurality of bosses on a side close to the drive mechanism. A slag collecting box (6) is further provided between the filter module (3) and the drive mechanism, and the opening of the slag collecting box (6) faces the filter module (3). The opening of the slag collecting box (6) is provided close to the filter plate (131), and the moving paths of the first scraper (4) and the second scraper (5) located on the filter module (3) conflict with the filter plate (131).

9. The electromagnetic heating system for waste oil pipeline according to claim 8, characterized in that: The driving mechanism comprises a hydraulic cylinder (8), a clamping chuck (7) and a motor; a through hole for allowing the hydraulic cylinder (8) to pass through is provided in the middle of the slag collecting box (6); a buckle is fixedly connected to one end of the slide plate (21) along the length direction; a slot for engaging with the opening is provided at the other end of the slide plate (21) along the length direction; a cover plate is detachably connected to the ends of the decoking module (2) and the filtering module (3); a boss is fixedly connected to one end of the decoking module (2) and the filtering module (3); a groove for engaging with the boss is provided at the other end of the decoking module (2) and the filtering module (3); the clamping chuck (7) is used to clamp and fix the slag collecting box (6) and the filtering module (3); and the motor, the hydraulic cylinder (8) and the clamping chuck (7) are electrically connected.

10. The electromagnetic heating system for waste oil pipeline according to claim 1, characterized in that: A heat preservation pipe (12) is also sleeved on the outer peripheral wall of the oil delivery pipe (1), and the heating coil (11) is located between the heat preservation pipe (12) and the oil delivery pipe (1).

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