A waste oil recovery system
Patent Information
- Application Number
- CN202522767735.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-26
- Publication Date
- 2026-10-27
- Estimated Expiration
- 2035-12-26
AI Technical Summary
[0005]为解决含轻组分、重组分以及颗粒的废油不易处理的问题；
本实用新型通过磁性过滤器和T型过滤器的双重物理拦截，去除废油中的铁磁性杂质及固体颗粒，随后工艺流程采用“先轻后重”的分离逻辑：脱轻塔专用去除汽油、溶剂油等轻质馏分，其塔顶的冷凝回流系统能有效回收有价值的轻组分；脱重塔则通过多层填料床的精细分馏和塔底电加热，在减压条件下高效分离并脱除沥青质、胶质等重质杂质。最终经过蒸馏的油品进入吸附配置釜，利用活性白土强大的吸附能力，深度脱除残余的色素、氧化物及微量极性杂质。通过“物理过滤—精密分馏—吸附精制”的阶梯式处理，确保了再生基础油能达到很高的纯度与颜色标准，构建了一条高效、完整的废油精制再生链条。
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Figure CN224901236U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the chemical industry, specifically to a waste oil recycling system. Background Technology
[0002] Industrial waste oil can be recycled. Currently used lubricating oil, apart from some being consumed by machinery and equipment and some being recycled, the rest flows directly or indirectly into the environment. In China alone, approximately 2.56 million tons of lubricating oil flowed into the environment in 2024. Lubricants flowing into the environment seriously pollute the atmosphere, land, rivers, and lakes, causing losses to natural resources and affecting the ecological environment and ecological balance.
[0003] Lubricating oil is mainly composed of base oil and additives, with base oil accounting for approximately 80-90% and additives accounting for about 10-20%. Base oils are mainly classified into three categories: mineral base oils, synthetic base oils, and vegetable base oils. In used lubricating oils, the main failure modes are oxidation and deterioration of the base oil and the consumption and hydrolysis of additives, such as organoboronate anti-wear additives. Performance will gradually decline until it can no longer protect the machine.
[0004] Waste engine oil recycled in factories becomes contaminated with water, carbon particles, metal particles, and other pollutants, and some may even form emulsions. Common emulsions are divided into two types: the first is a mixture of oil dispersed in water, and the second is a mixture of water dispersed in oil. Lubricating oil is a heat transfer medium. In high-temperature systems, long-term operation can lead to chemical changes such as cracking, oxidation, and coking. Trace amounts of metal particles accelerate this deterioration, and the heat transfer performance of the oil also declines over time, affecting the heat transfer rate of the entire heating system. Utility Model Content
[0005] To address the problem of difficult treatment of waste oil containing light components, heavy components, and particles; This utility model provides a waste oil recycling system, including a light oil removal tower, a heavy oil removal tower, and an adsorption preparation vessel connected in sequence. A magnetic filter and a T-type filter are installed in sequence on the inlet pipe of the light oil removal tower. The adsorption preparation vessel is filled with bleaching clay for adsorption and filtration. The outlet pipe of the adsorption preparation vessel is connected to a bleaching clay filter to filter bleaching clay waste residue. The filtrate enters a filtrate tank for storage.
[0006] As a preferred embodiment, a light-light ...
[0007] As a preferred embodiment, the deweight removal tower contains, from top to bottom, a first packed bed, a second packed bed, and a third packed bed. The feed to the deweight removal tower is located between the first and second packed beds, and the oil collecting hopper is located between the second and third packed beds. An electric heater is installed at the bottom of the deweight removal tower, and the liquid level inside the tower exceeds the electric heater. A far-infrared heater is preferred, with a maximum heating temperature of 500℃. It has advantages such as low heating lag, precise temperature control, and ease of control. The resistance far-infrared radiation heating device is covered with an aluminum silicate fiber insulation layer and uses a directional radiation parabolic reflector. When the silicon carbide plate radiating element is connected to current, it heats up, causing the radiating element to radiate far-infrared energy towards the tower wall. The tower wall absorbs the heat and heats the material through heat conduction. The heating device consists of several tile-shaped heating plates and melon-shaped heating plates. The tile-shaped heating plates are applied to the tower wall, and the melon-shaped heating plates are applied to the bottom of the tower, ensuring that the entire heated surface of the tower wall is covered by the radiation layer.
[0008] As a preferred embodiment, a first de-weighting condenser is installed at the top of the de-weighting tower. The first de-weighting condenser adopts a cross-flow shell structure. The liquid phase of the first de-weighting condenser falls directly to the top of the tower, and the gas phase enters the second de-weighting condenser. The gas phase outlet of the second de-weighting condenser is equipped with a vacuum unit for external discharge, and the liquid phase outlet is connected to the liquid phase outlet pipe of the de-weighting tower and flows into the adsorption preparation vessel.
[0009] As a preferred embodiment, the filtrate tank is equipped with a reflux circulation pipeline, on which a mixing pump, a terminal filter and a static mixer are sequentially installed. Additives are added to the static mixer to mix and disperse the filtrate, and the filtrate that meets the filtration criteria is then stored in the finished product tank.
[0010] As a preferred embodiment, a reboiler is provided at the bottom of the deweight removal tower, and a buffer tank is provided between the deweight removal tower and the adsorption preparation vessel. The liquid outlet pipes of the deweight removal tower, the reboiler, and the second deweight removal condenser are all connected to the buffer tank.
[0011] The beneficial effects of this utility model are as follows: This invention utilizes a dual physical interception system of magnetic and T-type filters to remove ferromagnetic impurities and solid particles from waste oil. The subsequent process employs a "light-to-heavy" separation logic: a dedicated light fraction removal tower removes gasoline, solvent oil, and other light fractions, with its top reflux system effectively recovering valuable light components; the heavy fraction removal tower, through multi-layer packed bed fine fractionation and bottom electric heating, efficiently separates and removes asphaltenes, gums, and other heavy impurities under reduced pressure. Finally, the distilled oil enters an adsorption reactor, where the powerful adsorption capacity of activated clay deeply removes residual pigments, oxides, and trace amounts of polar impurities. This step-by-step treatment—"physical filtration—precision fractionation—adsorption refining"—ensures that the regenerated base oil achieves high purity and color standards, constructing a highly efficient and complete waste oil refining and regeneration chain. Attached Figure Description
[0012] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein... Figure 1 This is a schematic diagram of the structure of the present invention.
[0013] The numbers in the attached diagram are: 1. Light weight removal tower; 11. Light weight removal condenser; 12. Reflux stratification tank; 2. Heavy weight removal tower; 21. First heavy weight removal condenser; 22. Second heavy weight removal condenser; 23. Vacuum unit; 24. Reboiler; 3. Adsorption preparation vessel; 31. Clay filter; 4. Magnetic filter; 5. T-type filter; 6. Filtrate tank; 61. Mixing pump; 62. Terminal filter; 63. Static mixer; 7. Buffer tank; 8. Finished product tank. Detailed Implementation
[0014] To illustrate the features of this utility model, the following description, in conjunction with the accompanying drawings and embodiments, will further explain this utility model.
[0015] Example 1: Please see Figure 1 This utility model provides a waste oil recovery system, including a light oil removal tower 1, a heavy oil removal tower 2, and an adsorption preparation vessel 3 connected sequentially along the process flow. The raw waste oil is first transported through an inlet pipe, on which a magnetic filter 4 and a T-type filter 5 are sequentially installed. The magnetic filter 4 contains 320 permanent magnets to remove ferromagnetic impurities. The T-type filter 5 uses a 100-mesh stainless steel screen with a filtration accuracy of 150 microns.
[0016] The light component removal tower 1 is a packed tower with a diameter of DN50 / DN600mm, preferably using Ф4mm Dixon packing. The feed inlet is located between the upper and lower packing layers, and a steam coil is installed at the bottom of the tower. A light component removal condenser 11 with a heat exchange area of 30 square meters is installed at the top of the tower. The vapor outlet of the light component removal condenser 11 is equipped with a vent pipe, and the liquid outlet is connected to a reflux separator 12 with a volume of 2 cubic meters. The reflux separator 12 is equipped with a reflux pipe connected to the upper part of the light component removal tower 1, realizing the separation and reflux control of the light components.
[0017] The deweight removal tower 2 has a diameter of DN300 and preferably uses BX500 wire mesh packing. Internally, from top to bottom, it consists of a first packing bed, a second packing bed, and a third packing bed, with heights of 1m, 1m, and 0.5m respectively. The feed inlet of the deweight removal tower 2 is located between the first and second packing beds. An oil collecting hopper is located between the second and third packing beds; the hopper is aeration-only, with a riser pipe in the middle and no opening at the bottom. A 45 kW electric heater is installed at the bottom of the tower, capable of heating the temperature up to 500℃. During operation, the liquid level inside the tower must completely submerge the electric heater. It has an explosion-proof rating of EXdIICT4 and is infinitely adjustable. A reboiler 24 with a heat exchange area of 25 square meters is also installed at the bottom of the tower.
[0018] The top of the deweight removal tower 2 is equipped with a first deweight removal condenser 21, which adopts a cross-flow shell structure with a heat exchange area of 40 square meters. Its liquid phase flows directly back to the top of the tower, while the gas phase enters the second deweight removal condenser 22. The second deweight removal condenser 22 has a heat exchange area of 20 square meters. Its gas phase outlet is connected to a vacuum unit 23 to maintain the system's negative pressure. The liquid phase outlet and the bottom liquid phase outlet converge into an outlet pipe, which connects to a buffer tank 7 with a volume of 5 cubic meters.
[0019] The outlet pipe of buffer tank 7 is connected to adsorption preparation vessel 3. Adsorption preparation vessel 3 has a volume of 6 cubic meters and contains 3% (by volume) of bleaching clay for adsorption and decolorization. The adsorbed mixture is then transported through the outlet pipe to a plate and frame bleaching clay filter 31. This filter has a filtration area of 30 square meters and can effectively trap bleaching clay waste. The filtrate is stored in a filtrate tank 6 with a volume of 8 cubic meters.
[0020] The filtrate tank 6 is equipped with a reflux circulation pipeline, on which a blending pump 61 with a flow rate of 10 cubic meters per hour, a terminal filter 62 with a precision of 1 micrometer, and a DN40 static mixer 63 with a length of 0.8 meters are installed sequentially. The terminal filter 62 is a bag filter with filter bags made of foldable ultrafine glass fiber with a pore size as small as 1 μm. The additive inlet of the static mixer 63 extends into the central highly turbulent zone to efficiently mix and disperse with the filtrate. The qualified filtrate that meets the final filtration criteria is stored in the finished product tank 8, which has a volume of 20 cubic meters.
[0021] This system achieves deep purification and recycling of waste oil through a treatment process that combines multi-stage distillation, adsorption, and precision filtration.
[0022] The above embodiments and accompanying drawings are only used to illustrate the technical solutions of this utility model and are not intended to limit this utility model. This utility model has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that any changes, modifications, additions, or substitutions made by those skilled in the art within the scope of this utility model do not depart from the spirit of this utility model and should also fall within the protection scope of the claims of this utility model. Other related technical structures not disclosed in detail in this utility model are existing technologies in the art.
Claims
1. A waste oil recycling system, characterized in that, The system includes a light removal tower (1), a heavy removal tower (2), and an adsorption preparation vessel (3) connected in sequence. A magnetic filter (4) and a T-type filter (5) are installed in sequence on the inlet pipe of the light removal tower (1). The adsorption preparation vessel (3) is filled with bleaching clay for adsorption and filtration. The outlet pipe of the adsorption preparation vessel (3) is connected to a bleaching clay filter (31) to filter bleaching clay waste residue. The filtrate enters the filtrate tank (6) for storage.
2. The waste oil recycling system according to claim 1, characterized in that: The light-removal tower (1) is equipped with a light-removal condenser (11) at the top of the tower. The gas phase outlet of the light-removal condenser (11) is equipped with a vent pipe, and the liquid phase outlet is equipped with a reflux stratification tank (12). The reflux stratification tank (12) is connected to the light-removal tower (1) by a reflux pipe.
3. The waste oil recovery system according to claim 1, characterized in that: The deweight removal tower (2) consists of a first packing bed, a second packing bed, and a third packing bed from top to bottom. The feed of the deweight removal tower (2) is located between the first packing bed and the second packing bed. The oil collection hopper is located between the second packing bed and the third packing bed. An electric heater is installed at the bottom of the deweight removal tower (2). The liquid level in the deweight removal tower (2) is above the electric heater.
4. The waste oil recovery system according to claim 1, characterized in that: The top of the de-weight tower (2) is equipped with a first de-weight condenser (21). The first de-weight condenser (21) adopts a cross-flow shell structure. The liquid phase of the first de-weight condenser (21) falls directly to the top of the tower, and the gas phase enters the second de-weight condenser (22). The gas phase outlet of the second de-weight condenser (22) is equipped with a vacuum unit (23) for external discharge, and the liquid phase outlet is connected to the liquid phase outlet pipe of the de-weight tower (2) and flows into the adsorption preparation vessel (3).
5. The waste oil recovery system according to claim 1, characterized in that: The filtrate tank (6) is equipped with a reflux circulation pipeline, on which a mixing pump (61), a terminal filter (62) and a static mixer (63) are installed in sequence. Additives are added to the static mixer (63) to mix and disperse with the filtrate. The filtrate that meets the filtration index enters the finished product tank (8) for storage.
6. The waste oil recovery system according to claim 5, characterized in that: A reboiler (24) is provided at the bottom of the de-weight tower (2), and a buffer tank (7) is provided between the de-weight tower (2) and the adsorption preparation vessel (3). The outlet pipes of the de-weight tower (2), the reboiler (24), and the second de-weight condenser (22) are all connected to the buffer tank (7).