Waste mineral oil regenerated light hydrocarbon removal and recovery device and use method thereof

Abstract

The invention belongs to the technical field of waste mineral oil dealkylation, and particularly relates to a waste mineral oil regenerated light hydrocarbon removal and recovery device and a use method thereof. A waste mineral oil regenerated light hydrocarbon removal and recovery device comprises a feeding unit, the feeding unit is connected with the inlet end of a light hydrocarbon removal tower, a reboiling unit is arranged on the light hydrocarbon removal tower, in the light hydrocarbon removal tower, a circulating pump sends materials at the bottom of the tower to a reboiler to be heated, light hydrocarbon is evaporated into a gas phase and rises to the tower top, and the gas phase rises to the tower bottom. The temperature of the tower top is adjusted through reflux of condensate of the first-stage condenser; the secondary condenser condenses the diesel oil component, and the diesel oil component is recovered by a diesel oil component extraction pump; under the assistance of a vacuum system, the third-stage condenser reduces the boiling point of light hydrocarbon, condenses light oil components and recycles the light oil components through a light oil component extraction pump, and precise separation of the light hydrocarbon components is achieved. The invention further provides a using method of the waste mineral oil regenerated light hydrocarbon removal and recycling device, and users can understand and use the device conveniently.

Description

Technical Field

[0001] The present invention belongs to the technical field of waste mineral oil dehydrogenation, and in particular to a waste mineral oil regeneration light hydrocarbon removal and recovery device and a method for using the same. Background Art

[0002] In industrial production and daily life, a significant amount of waste mineral oil is generated. Mineral oil is widely used in various mechanical equipment for lubrication and power transmission. After being extracted and refined from petroleum, coal, and oil shale, its physical and chemical properties change during extraction, processing, and use due to factors such as impurity contamination, oxidation, and thermal effects, rendering it unusable and ultimately generating waste mineral oil. Most domestic mineral oil light hydrocarbon recovery plants primarily recover C3 and C3+ components to produce products such as liquefied petroleum gas. These plants utilize adsorption, oil absorption, and condensation separation methods for light hydrocarbon recovery. Adsorption utilizes the selective adsorption properties of certain solid adsorbents for light hydrocarbons. However, adsorbents can easily become saturated during the adsorption process, requiring frequent regeneration. Furthermore, adsorbents have a limited lifespan and require regular replacement, increasing operating costs. Oil absorption utilizes the absorbent's ability to dissolve light hydrocarbons to recover these components. To maximize absorption efficiency, high operating pressures and low temperatures are often required, necessitating significant energy consumption for gas compression and cooling systems.

[0003] Adsorption and oil absorption methods usually consume a lot of energy, resulting in high overall energy consumption; the oil absorption method also has high energy consumption, high operating costs and low product yield. Summary of the Invention

[0004] The present invention is made to solve the above-mentioned problems, and its purpose is to provide a waste mineral oil regeneration light hydrocarbon removal and recovery device with low energy consumption and low operating costs and a method for using the same. In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a waste mineral oil regeneration light hydrocarbon removal and recovery device, comprising a feed unit, the feed unit is connected to the inlet end of a light hydrocarbon removal tower, a reboiler unit is provided on the light hydrocarbon removal tower, and a multi-stage condensing unit is provided on the top of the light hydrocarbon removal tower.

[0005] The multi-stage condensing unit includes a primary condenser, a secondary condenser, and a tertiary condenser. The inlet end of the primary condenser is connected to the top of the light hydrocarbon removal tower, the outlet end of the primary condenser is connected to the inlet end of the secondary condenser, the outlet end of the secondary condenser is connected to the inlet end of the tertiary condenser, and the outlet end of the secondary condenser and the outlet end of the tertiary condenser are connected to a collection unit.

[0006] The condensate outlet end of the primary condenser is connected to a reflux pump, and the outlet end of the reflux pump is connected to a light hydrocarbon removal tower and is connected to the top of the light hydrocarbon removal tower.

[0007] The collection unit includes a diesel component production pump and a light oil component production pump. The feed end of the diesel component production pump is connected to the condensate outlet end of the secondary condenser, and the outlet end of the diesel component production pump is connected to a diesel storage tank. The feed end of the light oil component production pump is connected to the condensate discharge end of the tertiary condenser, and the outlet end of the light oil component production pump is connected to a light oil storage tank.

[0008] The feed unit comprises a feed pump, an outlet end of the feed pump is connected to an inlet end of a heater, and the outlet end of the heater is connected to an inlet end of a light hydrocarbon removal tower.

[0009] The reboiler unit includes a reboiler and a circulation pump, wherein the feed end of the circulation pump is connected to the bottom of the light hydrocarbon removal tower, the discharge end of the circulation pump is connected to the feed end of the reboiler, and the discharge end of the reboiler is connected to the bottom of the light hydrocarbon removal tower.

[0010] The discharge end of the circulation pump is connected to a cooler.

[0011] The three-stage condenser is connected to a vacuum system.

[0012] A method for using a waste mineral oil regeneration light hydrocarbon removal and recovery device, specifically comprising:

[0013] Feeding and heating: the feed pump delivers waste mineral oil, which is heated by the heater and then sent to the light hydrocarbon removal tower;

[0014] The waste mineral oil circulates in the tower and evaporates with light hydrocarbons. The waste mineral oil is circulated as material to the reboiler through the circulation pump. The reboiler evaporates all the waste mineral oil to light hydrocarbons and sends them to the light hydrocarbon removal tower.

[0015] Light hydrocarbon condensation and recovery: Light hydrocarbon vapor is cooled in sequence through the primary condenser, secondary condenser and tertiary condenser. The condensate from the primary condenser is refluxed to the top of the tower. The condensate from the secondary condenser is extracted as diesel component to the diesel storage tank. The condensate from the tertiary condensate is extracted as light oil to the light oil storage tank through light oil extraction.

[0016] Production of bottom products: The waste mineral oil after light hydrocarbon removal at the bottom of the light hydrocarbon removal tower is cooled in a cooler and then produced to the next production unit.

[0017] The technical effect of the present invention is as follows: the feed pump extracts the waste mineral oil and transports it to the heater. After the heater heats up according to the process requirements, it provides raw materials with suitable temperature for the light hydrocarbon removal tower, creating conditions for the evaporation of light hydrocarbons. In the light hydrocarbon removal tower, the circulating pump sends the bottom material to the reboiler for heating, and the light hydrocarbons evaporate into the gas phase and rise to the top of the tower. The unevaporated materials reflux and circulate until the light hydrocarbons are fully evaporated. The first-stage condenser at the top of the tower condenses the light hydrocarbons, and the condensate of the first-stage condenser refluxes to adjust the top temperature of the tower; the second-stage condenser condenses the diesel component, which is recovered by the diesel component extraction pump; the third-stage condenser, with the assistance of the vacuum system, reduces the boiling point of the light hydrocarbons, condenses the light oil component, and is recovered by the light oil component extraction pump, thereby realizing the precise separation of the light hydrocarbon components. The waste mineral oil at the bottom of the light hydrocarbon removal tower is diverted to the cooler through the circulating pump for cooling, and is transported to the next production unit after cooling, completing the entire light hydrocarbon removal recovery process. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] This manual includes the following drawings, which show the following contents:

[0019] Figure 1 The invention relates to a waste mineral oil regeneration light hydrocarbon removal and recovery device.

[0020] The markings in the figure are: 1. Feed unit; 101. Feed pump; 102. Heater; 2. Light hydrocarbon removal tower; 3. Reboiler unit; 301. Reboiler; 302. Circulation pump; 4. Multi-stage condensation unit; 401. Primary condenser; 402. Secondary condenser; 403. Tertiary condenser; 5. Collection unit; 501. Diesel component production pump; 502. Light oil component production pump; 6. Cooler; 7. Vacuum system. DETAILED DESCRIPTION

[0021] The following is a further detailed description of the specific implementation methods of the present invention through the description of the embodiments with reference to the accompanying drawings, with the aim of helping those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention and to facilitate their implementation.

[0022] like Figure 1As shown, a waste mineral oil regeneration and light hydrocarbon removal and recovery device includes a feed unit 1, which is connected to the inlet end of a light hydrocarbon removal tower 2, a reboiler unit 3 is provided on the light hydrocarbon removal tower 2, and a multi-stage condensation unit 4 is provided on the top of the light hydrocarbon removal tower 2. The feed unit 1 transports and preliminarily heats the waste mineral oil, creating temperature conditions for the subsequent light hydrocarbon removal process, so that the waste mineral oil can be more easily separated from the light hydrocarbons after entering the light hydrocarbon removal tower 2. The light hydrocarbon removal tower 2 provides space for the separation of waste mineral oil and light hydrocarbons. Through gas-liquid contact, mass transfer and heat transfer in the tower, light hydrocarbons are separated from the waste mineral oil. After the waste mineral oil is dehydrogenated, the waste mineral oil after light hydrocarbon removal is retained at the bottom of the tower. The reboiler unit 3 provides continuous heat to the material in the light hydrocarbon removal tower 2 to ensure stable evaporation of light hydrocarbons, and enhances heat and mass transfer through circulating flow, thereby improving the efficiency of light hydrocarbon removal. The multi-stage condensation unit 4 performs graded condensation on the light hydrocarbon vapor at the top of the light hydrocarbon removal tower 2, and utilizes different temperature gradients to sequentially separate different components, thereby improving the purity and efficiency of light hydrocarbon recovery.

[0023] Multi-stage condensing unit 4 includes a primary condenser 401, a secondary condenser 402, and a tertiary condenser 403. The inlet of primary condenser 401 is connected to the top of light hydrocarbon removal tower 2, and the outlet of primary condenser 401 is connected to the inlet of secondary condenser 402, which is in turn connected to the inlet of tertiary condenser 403. The outlets of secondary condenser 402 and tertiary condenser 403 are connected to a collection unit 5. The inlet of primary condenser 401 is connected to the top of light hydrocarbon removal tower 2, and the outlet of primary condenser 401 is connected to the inlet of secondary condenser 402, which is in turn connected to the inlet of tertiary condenser 403. This forms a condensation path from light hydrocarbon vapor to primary condenser 401, secondary condenser 402, and tertiary condenser 403. Collection unit 5 collects the diesel and light oil components condensed by secondary condenser 402 and tertiary condenser 403 in multi-stage condensing unit 4, respectively, and transports them to corresponding storage tanks for storage, thereby recovering light hydrocarbon products. The light hydrocarbon vapor enters the primary condenser 401 from the top of the light hydrocarbon removal tower 2, where it is initially condensed. Part of the cold uncondensed vapor enters the secondary condenser 402, where the diesel component is condensed into liquid at a temperature suitable for the condensation of the diesel component. The diesel component condensate is recovered through the collection unit 5; the remaining vapor enters the tertiary condenser 403, where the light oil component is condensed at a lower temperature, and the light oil component condensate is recovered through the collection unit 5.

[0024] The condensate outlet of primary condenser 401 is connected to a reflux pump 8, which in turn is connected to the top of de-light hydrocarbon tower 2. Reflux pump 8 refluxes a portion of the condensate from primary condenser 401 back to the top of de-light hydrocarbon tower 2, where it serves as cold reflux to regulate the tower top temperature, stabilize the gas-liquid equilibrium within the tower, and ensure the light hydrocarbon separation efficiency, thereby ensuring the quality of the light hydrocarbon product. The condensate outlet of primary condenser 401 is connected to the feed end of reflux pump 8, which in turn is connected to the top of de-light hydrocarbon tower 2, forming a reflux path from primary condenser 401 condensate to reflux pump 8 and then to the top of de-light hydrocarbon tower 2. After condensate is generated in primary condenser 401, reflux pump 8 is activated to extract a certain amount of condensate and transport it back to the top of de-light hydrocarbon tower 2. This refluxed condensate comes into contact with the rising light hydrocarbon vapor from the tower top, absorbing heat and lowering the vapor temperature, maintaining a stable tower top temperature and ensuring the stability and efficiency of light hydrocarbon separation.

[0025] Collection unit 5 includes a diesel component production pump 501 and a light oil component production pump 502. The feed end of diesel component production pump 501 is connected to the condensate outlet of secondary condenser 402, and the outlet end of diesel component production pump 501 is connected to a diesel storage tank. The feed end of light oil component production pump 502 is connected to the condensate outlet of tertiary condenser 403, and the outlet end of light oil component production pump 502 is connected to a light oil storage tank. The feed end of diesel component production pump 501 is connected to the condensate outlet of secondary condenser 402, and the outlet end is connected to the diesel storage tank; the feed end of light oil component production pump 502 is connected to the condensate outlet of tertiary condenser 403, and the outlet end of light oil component production pump 502 is connected to the light oil storage tank, forming a production path from secondary condenser 402 → diesel component production pump 501 → diesel storage tank; and from tertiary condenser 403 → light oil component production pump 502 → light oil storage tank. After the diesel component in the secondary condenser 402 is condensed, the diesel component extraction pump 501 is started to extract the diesel component and transport it to the diesel storage tank for storage; after the light oil component in the tertiary condenser 403 is condensed, the light oil component extraction pump 502 is started to extract the light oil component and transport it to the light oil storage tank for storage, completing the recovery and collection of light hydrocarbon products.

[0026] Feed unit 1 includes a feed pump 101, the outlet of which is connected to the inlet of a heater 102, which in turn is connected to the inlet of a light hydrocarbon removal tower 2. This connection forms a heating and transport path from waste mineral oil to feed pump 101, then heater 102, and finally to light hydrocarbon removal tower 2. During operation, feed pump 101 is activated to draw waste mineral oil and transport it to heater 102. Heater 102 heats the waste mineral oil, which then enters light hydrocarbon removal tower 2 through a connecting pipeline. Once in this tower, the separation of light hydrocarbons from base oil is facilitated.

[0027] The reboiler unit 3 includes a reboiler 301 and a circulating pump 302. The feed end of the circulating pump 302 is connected to the bottom of the de-light hydrocarbon tower 2, the discharge end of the circulating pump 302 is connected to the feed end of the reboiler 301, and the discharge end of the reboiler 301 is connected to the bottom of the de-light hydrocarbon tower 2. The feed end of the circulating pump 302 is connected to the bottom of the de-light hydrocarbon tower 2, the discharge end is connected to the feed end of the reboiler 301, and the discharge end of the reboiler 301 is connected to the bottom of the de-light hydrocarbon tower 2, forming a circulating heating loop from the bottom of the de-light hydrocarbon tower 2 → circulating pump 302 → reboiler 301 → the bottom of the de-light hydrocarbon tower 2. The circulating pump 302 extracts the bottom of the de-light hydrocarbon tower 2 and transports it to the reboiler 301; the reboiler 301 heats the material, causing the light hydrocarbons therein to further evaporate. The heated material returns to the bottom of the de-light hydrocarbon tower 2, continuously providing the heat required for the evaporation of light hydrocarbons in the tower, thereby promoting the light hydrocarbon separation process.

[0028] The discharge end of circulating pump 302 is connected to cooler 6. After passing through circulating pump 302, the waste oil at the bottom of de-light hydrocarbon tower 2, which has been removed from the bottom of tower 2, goes to reboiler 301 and then to cooler 6, forming a cooling path from de-light hydrocarbon tower 2 bottom material to circulating pump 302 and then to cooler 6. The waste mineral oil removed from the bottom of de-light hydrocarbon tower 2 is transported by circulating pump 302, with a portion diverted to cooler 6. Cooler 6 reduces the temperature of the waste oil, and the cooled waste mineral oil is then extracted and transported to the next production unit for subsequent processing.

[0029] The tertiary condenser 403 is connected to the vacuum system 7. The vacuum system 7 is connected to the tertiary condenser 403 to reduce the environmental pressure of the tertiary condensation link, so that light hydrocarbons can condense at a lower temperature, reducing heat energy consumption, while strengthening the condensation effect and improving the light hydrocarbon recovery efficiency. When the light hydrocarbon vapor enters the tertiary condenser 403, the vacuum system 7 is activated to extract air and other gases from the tertiary condenser 403 to reduce the internal pressure. In a low-pressure environment, the boiling point of light hydrocarbons is lowered, making them easier to condense into liquid. Combined with the cooling effect of the tertiary condenser 403, the light oil component is efficiently recovered. At the same time, due to the lower condensation temperature, cooling energy consumption is reduced, improving the energy efficiency of the device and the light hydrocarbon recovery effect.

[0030] A method for using a waste mineral oil regeneration light hydrocarbon removal and recovery device, specifically comprising:

[0031] Feeding and heating: Feed pump 101 delivers waste mineral oil, which is heated by heater 102 and then fed into light hydrocarbon removal tower 2. Feed pump 101 is activated to draw waste mineral oil from the raw material storage facility according to production needs and transport it along a pipeline to heater 102. Feed pump 101 ensures stable material delivery. Heater 102 activates its heating function and sets the heating temperature according to process requirements. The waste mineral oil exchanges heat with the heat source in heater 102, gradually increasing its temperature. It is then fed into light hydrocarbon removal tower 2 through an outlet pipeline. This creates the temperature conditions for the subsequent evaporation of light hydrocarbons, allowing them to more easily evaporate from the liquid phase after entering the waste mineral oil tower.

[0032] As the waste mineral oil circulates within the tower and evaporates light hydrocarbons, it is circulated as material to reboiler 301 via circulation pump 302. Reboiler 301 evaporates all the waste mineral oil and light hydrocarbons into the de-light hydrocarbon tower 2. After the waste mineral oil enters de-light hydrocarbon tower 2 and a certain amount of waste mineral oil has accumulated within the tower, circulation pump 302 is activated. Circulation pump 302 draws material from the bottom of de-light hydrocarbon tower 2 and delivers it to reboiler 301 at a set flow rate. This circulating flow ensures continuous contact between the material within the tower and reboiler 301, enhancing heat and mass transfer. Reboiler 301 is turned on to heat the incoming waste mineral oil. Based on the boiling point difference between light hydrocarbons and base oil, the heating temperature and duration of reboiler 301 are controlled, allowing the light hydrocarbon components in the waste mineral oil to gradually evaporate into a vapor phase, which then rises to the overhead space of de-light hydrocarbon tower 2. Meanwhile, unevaporated material circulates back to the bottom of de-light hydrocarbon tower 2 and continues to participate in the evaporation cycle until all light hydrocarbons are evaporated.

[0033] Light hydrocarbon condensation and recovery: Light hydrocarbon vapors are cooled sequentially through the primary condenser 401, secondary condenser 402, and tertiary condenser 403. The condensate from the primary condenser 401 flows back to the top of the tower, while the condensate from the secondary condenser 402 is extracted as diesel components and sent to a diesel storage tank. The condensate from the tertiary condenser is extracted as light oil and sent to a light oil storage tank. Light hydrocarbon vapors from the top of the light hydrocarbon removal tower 2 enter the primary condenser 401. The primary condenser 401 is cooled by a cooling medium, causing some of the light hydrocarbon vapors to condense. The condensate is then pumped back to the top of the light hydrocarbon removal tower 2 via a reflux line by a reflux pump 8. This cold reflux comes into contact with the hot steam rising from the top of the tower, lowering the steam temperature and maintaining a stable top temperature to prevent excessive volatilization of light hydrocarbons from overheating and affecting separation. Furthermore, through gas-liquid mass transfer, impurities in the vapor are further separated, improving the purity of the subsequent diesel and light oil components and stabilizing the light hydrocarbon separation effect. Uncondensed vapor from the primary condenser 401 enters the secondary condenser 402. The secondary condenser 402 is set at a lower condensing temperature to fully condense the diesel component into a liquid state. The liquid diesel component accumulates at the bottom of the secondary condenser 402. After reaching a certain liquid level, the diesel component extraction pump 501 is started to transport the diesel component to the diesel storage tank for storage. The uncondensed steam in the secondary condenser 402 enters the tertiary condenser 403. The tertiary condenser 403 uses a lower condensing temperature to condense the light oil component into a liquid state. After the liquid light oil accumulates to a certain amount, the light oil component extraction pump 502 is started to transport the light oil component to the light oil storage tank for storage. Through the three-stage gradient condensation of the primary condenser 401, the secondary condenser 402 and the tertiary condenser 403, the diesel and light oil components in the light hydrocarbons are accurately separated, thereby improving the product recovery rate and purity.

[0034] Cooling and Recovery: The waste mineral oil at the bottom of light hydrocarbon removal tower 2 is partially diverted via circulating pump 302 and enters cooler 6. Cooler 6 exchanges heat with the waste mineral oil through a cooling medium, lowering its temperature. The cooled waste mineral oil is then transported via a recovery pipeline to the next production unit for subsequent processing.

[0035] Functions and Effects of the Embodiments

[0036] Feed pump 101 extracts waste mineral oil and transports it to heater 102. After being heated according to process requirements, heater 102 provides raw materials at a suitable temperature for light hydrocarbon removal tower 2, creating conditions for the evaporation of light hydrocarbons. Inside light hydrocarbon removal tower 2, circulating pump 302 transports the bottom material to reboiler 301 for heating. The light hydrocarbons evaporate into a gaseous phase and rise to the top of the tower. The unevaporated material refluxes and circulates until the light hydrocarbons are fully evaporated. The first-stage condenser 401 at the top of the tower condenses the light hydrocarbons. The condensate from the first-stage condenser 401 refluxes to adjust the top temperature of the tower; the second-stage condenser 402 condenses the diesel component, which is recovered by the diesel component extraction pump 501; the third-stage condenser 403, with the assistance of vacuum system 7, lowers the boiling point of the light hydrocarbons, condenses the light oil component, and recovers it through the light oil component extraction pump 502, achieving precise separation of the light hydrocarbon components. The waste mineral oil at the bottom of light hydrocarbon removal tower 2 is diverted to cooler 6 via circulating pump 302 for cooling. After cooling, it is transported to the next production unit, completing the entire light hydrocarbon removal and recovery process.

[0037] The present invention has been described above with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described method. Any non-substantial improvements made using the method concepts and technical solutions of the present invention, or any direct application of the above-described concepts and technical solutions to other situations without modification, fall within the scope of protection of the present invention.

Claims

1. A waste mineral oil regeneration light hydrocarbon removal and recovery device, characterized in that: The invention comprises a feed unit (1), wherein the feed unit (1) is connected to the inlet end of a light hydrocarbon removal tower (2), a reboiler unit (3) is provided on the light hydrocarbon removal tower (2), and a multi-stage condensation unit (4) is provided on the top of the light hydrocarbon removal tower (2).

2. The waste mineral oil regeneration light hydrocarbon removal and recovery device according to claim 1, characterized in that: The multi-stage condensing unit (4) comprises a primary condenser (401), a secondary condenser (402) and a tertiary condenser (403); the primary condenser (401) and the inlet end are connected to the top of the light hydrocarbon removal tower (2); the outlet end of the primary condenser (401) is connected to the inlet end of the secondary condenser (402); the outlet end of the secondary condenser (402) is connected to the inlet end of the tertiary condenser (403); and the outlet end of the secondary condenser (402) and the outlet end of the tertiary condenser (403) are connected to a collection unit (5).

3. The waste mineral oil regeneration light hydrocarbon removal and recovery device according to claim 2, characterized in that: The condensate outlet of the primary condenser (401) is connected to a reflux pump (8), and the outlet of the reflux pump (8) is connected to the light hydrocarbon removal tower (2) and the top of the light hydrocarbon removal tower (2).

4. The waste mineral oil regeneration light hydrocarbon removal and recovery device according to claim 2, characterized in that: The collection unit (5) includes a diesel component production pump (501) and a light oil component production pump (502), wherein the feed end of the diesel component production pump (501) is connected to the condensate outlet end of the secondary condenser (402), and the outlet end of the diesel component production pump (501) is connected to a diesel storage tank, and the feed end of the light oil component production pump (502) is connected to the condensate discharge end of the tertiary condenser (403), and the outlet end of the light oil component production pump (502) is connected to a light oil storage tank.

5. The waste mineral oil regeneration and light hydrocarbon removal and recovery device according to claim 1, characterized in that: The feed unit (1) comprises a feed pump (101), the outlet end of the feed pump (101) is connected to the inlet end of the heater (102), and the outlet end of the heater (102) is connected to the inlet end of the light hydrocarbon removal tower (2).

6. The waste mineral oil regeneration and light hydrocarbon removal and recovery device according to claim 1, characterized in that: The reboiler unit (3) comprises a reboiler (301) and a circulation pump (302), wherein the feed end of the circulation pump (302) is communicated with the bottom of the light hydrocarbon removal tower (2), the discharge end of the circulation pump (302) is communicated with the feed end of the reboiler (301), and the discharge end of the reboiler (301) is communicated with the bottom of the light hydrocarbon removal tower (2).

7. The waste mineral oil regeneration and light hydrocarbon removal and recovery device according to claim 1, characterized in that: The discharge end of the circulation pump (302) is connected to a cooler (6).

8. The waste mineral oil regeneration and light hydrocarbon removal and recovery device according to claim 1, characterized in that: The three-stage condenser (403) is connected to a vacuum system (7).

9. A method for using the waste mineral oil regeneration and light hydrocarbon removal and recovery device according to any one of claims 1 to 9, characterized in that: Specifically: Feeding and heating: the feed pump (101) delivers the waste mineral oil, which is heated by the heater (102) and then sent to the light hydrocarbon removal tower (2); The waste mineral oil circulates in the tower and evaporates with light hydrocarbons. The waste mineral oil is circulated as material to the reboiler (301) through the circulation pump (302). The reboiler (301) evaporates all the waste mineral oil to light hydrocarbons and then sends them to the light hydrocarbon removal tower (2); Light hydrocarbon condensation and recovery: the light hydrocarbon vapor is cooled in sequence through the primary condenser (401), the secondary condenser (402) and the tertiary condenser (403); the condensate of the primary condenser (401) is refluxed to the top of the tower; the condensate of the secondary condenser (402) is extracted as a diesel component to a diesel storage tank; the tertiary condensate is extracted as light oil to a light oil storage tank through light oil extraction; Production of bottom products: The waste mineral oil after light hydrocarbon removal at the bottom of the light hydrocarbon removal tower (2) is cooled by a cooler (6) and then produced to the next production unit.

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