Waste mineral oil recovery pretreatment system
By employing preheating, mixing, and fractionation operations in the pretreatment system, the problem of catalyst coking and carbon deposition was solved, achieving efficient recovery of waste mineral oil and improving the recovery rate.
Patent Information
- Application Number
- CN202520174196.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-26
- Publication Date
- 2026-01-27
- Estimated Expiration
- 2035-01-26
AI Technical Summary
In existing waste mineral oil recovery processes, hydrogen and heavy metals and residual carbon in waste mineral oil deposit on the catalyst surface, leading to catalyst coking and carbon buildup, which affects service life and reduces recovery rate.
A waste mineral oil recovery pretreatment system is adopted, including a preheater, a stirrer, a catalyst feeding device, a circulating reactor, a hydrogenation assembly, and an atmospheric and vacuum distillation assembly. Through preheating, mixing, hydrocracking reaction, and atmospheric and vacuum distillation, liquefied gas, liquid fraction, and tailings are separated, avoiding catalyst coking and improving the recovery rate.
It effectively separates metals, residual carbon, and solid particles from waste mineral oil, extending the catalyst's lifespan and improving the recovery rate of waste mineral oil.
Smart Images
Figure CN223837360U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of waste mineral oil treatment technology, specifically relating to a waste mineral oil recycling pretreatment system. Background Technology
[0002] Waste mineral oil refers to mineral oil extracted and refined from petroleum, coal, and oil shale, whose original physical and chemical properties have been altered during extraction, processing, and use due to contamination by impurities, oxidation, and heat, rendering it unusable. Waste mineral oil is a common waste product in industrial production, containing large amounts of harmful substances. Direct discharge of waste mineral oil will cause serious pollution to natural resources such as soil and water. Therefore, the treatment and recycling of waste mineral oil is of great significance in industrial production.
[0003] Existing waste mineral oil recycling processes mainly involve mixing waste mineral oil with hydrogen at a certain temperature and introducing it into a reactor. Under the action of a catalyst, the hydrogen reacts with the unsaturated hydrocarbons in the waste mineral oil to achieve the recycling of waste mineral oil.
[0004] However, in existing waste mineral oil recovery processes, hydrogen can react with heavy metals and residual carbon in the waste mineral oil, causing these substances to deposit on the surface of the catalyst. This leads to coking and carbon buildup on the catalyst, affecting its lifespan and reducing the recovery rate of the waste mineral oil. Utility Model Content
[0005] To address the technical problem in the prior art that hydrogen reacts with heavy metals in waste mineral oil during existing waste mineral oil recovery processes, causing heavy metals to deposit on the catalyst surface, affecting catalyst lifespan, and reducing waste mineral oil recovery rate, this invention provides a waste mineral oil recovery pretreatment system.
[0006] To achieve the above objectives, the present invention adopts the following technical solution:
[0007] A waste mineral oil recycling and pretreatment system, the system comprising a preheater, a stirrer, a catalyst feeding device, a circulating reactor, a hydrogenation assembly, an atmospheric and vacuum distillation assembly, and a storage assembly;
[0008] The preheater is connected to waste mineral oil for preheating the waste mineral oil;
[0009] The agitator is connected to the preheater;
[0010] The circulating reactor is connected to the agitator;
[0011] The catalyst feeding device is connected to the agitator;
[0012] The hydrogenation assembly is connected to the circulating reactor;
[0013] The atmospheric and vacuum distillation assembly is connected to the circulating reactor;
[0014] The storage component is connected to the atmospheric and vacuum distillation component.
[0015] Optionally, the storage component includes a liquefied gas storage device, a liquid phase fraction storage device, and a tailings storage device;
[0016] The liquefied gas storage device, the liquid phase fraction storage device, and the tailings storage device are all connected to the atmospheric and vacuum distillation assembly.
[0017] The atmospheric and vacuum distillation assembly is used to distill the waste mineral oil into liquefied gas, liquid fraction and tailings.
[0018] The liquefied gas storage device is used to store liquefied gas;
[0019] The liquid phase fraction storage device is used to store liquid phase fractions;
[0020] The tailings storage device is used to store tailings.
[0021] Optionally, the liquefied gas storage tank is connected to the stirrer and the circulating reactor.
[0022] Optionally, the preheater is any one of a steam heater, an electric heater, or a heat exchanger.
[0023] Optionally, the circulating reactor is equipped with a hydrogen regulating valve, which connects the circulating reactor and the hydrogenation assembly.
[0024] Optionally, the catalyst feeding device is equipped with a feeding sensor, and the catalyst feeding device is used to add oil-soluble metal catalysts into the agitator.
[0025] Optionally, the hydrogenation assembly is a new hydrogen compressor; the new hydrogen compressor is used to supply hydrogen to the circulating reactor.
[0026] The beneficial effects of this utility model are:
[0027] This invention provides a waste mineral oil recovery pretreatment system. The system preheats the received waste mineral oil using a preheater, and then thoroughly mixes the catalyst supplied by the catalyst feeding device with the preheated waste mineral oil using a stirrer. After hydrocracking in a circulating reactor, atmospheric and vacuum fractionation is performed using an atmospheric and vacuum fractionation unit to separate metals, residual carbon, and solid particles from the waste mineral oil, forming liquefied gas, liquid fraction, and tailings. The liquid fraction is then further processed through hydrogenation in subsequent steps. This system solves the problems of catalyst coking, carbon buildup, and short service life in existing technologies, thus improving the recovery rate of waste mineral oil. Attached Figure Description
[0028] Figure 1 This is a schematic diagram of the waste mineral oil recycling and pretreatment system in this utility model;
[0029] Figure 2 This is a further schematic diagram of the waste mineral oil recycling and pretreatment system of this utility model.
[0030] The components include: 1. Preheater; 2. Agitator; 3. Catalyst feeding device; 4. Circulating reactor; 41. Hydrogen regulating valve; 5. Hydrogenation assembly; 6. Atmospheric and vacuum distillation assembly; 7. Storage assembly; 71. Liquefied gas storage device; 72. Liquid phase fraction storage device; 73. Tailings storage device. Detailed Implementation
[0031] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this utility model or its application or use. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0032] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to the present invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.
[0033] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.
[0034] In the description of this utility model, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.
[0035] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.
[0036] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.
[0037] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.
[0038] See Figure 1 The diagram shows a schematic of a waste mineral oil recycling pretreatment system as described in this application. The system includes a preheater 1, a stirrer 2, a catalyst feeding device 3, a circulating reactor 4, a hydrogenation assembly 5, an atmospheric and vacuum distillation assembly 6, and a storage assembly 7. The preheater 1 is connected to waste mineral oil for preheating. The stirrer 2 is connected to the preheater 1. The circulating reactor 4 is connected to the stirrer 2. The catalyst feeding device 3 is connected to the stirrer 2. The hydrogenation assembly 5 is connected to the circulating reactor 4. The atmospheric and vacuum distillation assembly 6 is connected to the circulating reactor 4. The storage assembly 7 is connected to the atmospheric and vacuum distillation assembly 6.
[0039] In this embodiment, the received waste mineral oil is preheated by the preheater 1, and the catalyst provided by the catalyst feeding device 3 is fully mixed with the preheated waste mineral oil by the stirrer 2. After hydrocracking reaction by the circulating reactor 4, atmospheric and vacuum fractionation is performed by the atmospheric and vacuum fractionation component 6 to separate the metals, residual carbon and solid particles in the waste mineral oil, forming liquefied gas, liquid fraction and tailings. The liquid fraction is then further hydrogenated in subsequent processes. This solves the problems of catalyst coking, carbon deposition and short service life in the prior art and improves the recovery rate of waste mineral oil.
[0040] For example, the test results of the oil before and after pretreatment show that, using the waste mineral oil recycling pretreatment system provided in this embodiment, the density of the waste mineral oil (20℃) before pretreatment is 0.87 g / cm³. 3 The sulfur content is 897 mg / L, nitrogen content is 976 mg / L, residual carbon content is 1.35%, calcium is 1495 ppm, feine oxide is 136 ppm, magnesium is 112 ppm, phosphorus is 523 ppm, zinc is 531 ppm, potassium is 48 ppm, al is 19 ppm, and spores are 16 ppm. After pretreatment by this waste mineral oil recovery pretreatment system, the liquid phase distillate density (20℃) is 0.86 g / cm³. 3 The residual carbon content was not detected, the mechanical impurities were 0.031%, Ca was 5.2 ppm, Fe was 2.1 ppm, Zn was 1.2 ppm, and other heavy metal ions were not detected.
[0041] Optionally, refer to Figure 2The storage component 7 in this invention includes a liquefied gas storage unit 71, a liquid fraction storage unit 72, and a tailings storage unit 73; the liquefied gas storage unit 71, the liquid fraction storage unit 72, and the tailings storage unit 73 are all connected to the atmospheric and vacuum distillation component 6; the atmospheric and vacuum distillation component 6 is used to distill waste mineral oil into liquefied gas, liquid fraction, and tailings; the liquefied gas storage unit 71 is used to store liquefied gas; the liquid fraction storage unit 72 is used to store liquid fraction; and the tailings storage unit 73 is used to store tailings.
[0042] Specifically, the reaction products from the circulating reactor 4 are separated into liquefied gas, liquid fractions, and tailings by the atmospheric and vacuum distillation component 6. The liquid fractions are naphtha fractions with initial boiling points up to 180 degrees Celsius, diesel fractions with temperatures from 180 degrees Celsius to 360 degrees Celsius, vacuum distillate oils with temperatures from 360 degrees Celsius to 450 degrees Celsius, and vacuum tailings with temperatures above 450 degrees Celsius.
[0043] Furthermore, the tailings can be used for the production of solid fuels or carbon materials to improve utilization.
[0044] Optionally, the liquefied gas storage device 71 in this invention is connected to the stirrer 2 and the circulating reactor 4.
[0045] In this embodiment, liquefied gas is connected to the stirrer 2 and the circulating reactor 4 as a raw material gas for heating, thereby improving energy utilization.
[0046] Optionally, the preheater 1 in this invention can be any one of a steam heater, an electric heater, or a heat exchanger. The waste mineral oil is preheated to 60 to 180 degrees Celsius by the preheater 1 to facilitate subsequent processes.
[0047] Optionally, the circulating reactor 4 in this invention is equipped with a hydrogen regulating valve 41, which connects the circulating reactor 4 and the hydrogen addition assembly 5. When adding hydrogen to the circulating reactor, the amount of hydrogen is adjusted by the hydrogen regulating valve so that the ratio of waste mineral oil to hydrogen in the circulating reactor 4 is 400:1 to 2000:1.
[0048] Specifically, in the circulating reactor 4, waste mineral oil in a ratio of 800:1 can be heated with hydrogen to a reaction temperature of 500°C and a reaction pressure of 8MPa for hydrocracking reaction.
[0049] Optionally, the catalyst feeding device 3 of this utility model is equipped with a feeding sensor. The amount of catalyst added is detected by the feeding sensor, and the amount of catalyst added to the stirrer 2 is adjusted according to the detection result. Specifically, the catalyst feeding device 3 stores an oil-soluble metal catalyst and is used to add the oil-soluble metal catalyst to the stirrer 2.
[0050] Optionally, the hydrogenation component 5 in this invention is a new hydrogen compressor; the new hydrogen compressor is used to supply hydrogen gas with a temperature of 25 degrees Celsius to 60 degrees Celsius, a pressure of 0.5 MPa to 5 MPa, and a purity greater than 99% to the circulating reactor 4.
[0051] In this embodiment, specifically, the stirring speed of the stirrer 2 can be 60 r / min to 200 r / min.
[0052] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0053] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.
Claims
1. A waste mineral oil recycling pretreatment system, characterized in that, The system includes a preheater (1), a stirrer (2), a catalyst feeding device (3), a circulating reactor (4), a hydrogenation assembly (5), an atmospheric and vacuum distillation assembly (6), and a storage assembly (7); The preheater (1) is connected to waste mineral oil for preheating the waste mineral oil; The stirrer (2) is connected to the preheater (1); The circulating reactor (4) is connected to the agitator (2); The catalyst feeding device (3) is connected to the agitator (2); The hydrogenation assembly (5) is connected to the circulating reactor (4); The atmospheric and vacuum distillation assembly (6) is connected to the circulating reactor (4); The storage component (7) is connected to the atmospheric and vacuum distillation component (6).
2. The waste mineral oil recycling pretreatment system according to claim 1, characterized in that, The storage component (7) includes a liquefied gas storage device (71), a liquid phase fraction storage device (72), and a tailings storage device (73); The liquefied gas storage device (71), the liquid phase fraction storage device (72), and the tailings storage device (73) are all connected to the atmospheric and vacuum distillation assembly (6); The atmospheric and vacuum distillation assembly (6) is used to distill the waste mineral oil into liquefied gas, liquid fraction and tailings; The liquefied gas storage device (71) is used to store liquefied gas; The liquid phase fraction storage device (72) is used to store liquid phase fractions; The tailings storage device (73) is used to store tailings.
3. The waste mineral oil recycling pretreatment system according to claim 2, characterized in that, The liquefied gas storage device (71) is connected to the stirrer (2) and the circulating reactor (4).
4. The waste mineral oil recycling pretreatment system according to claim 1, characterized in that, The preheater (1) is any one of a steam heater, an electric heater, or a heat exchanger.
5. The waste mineral oil recycling pretreatment system according to claim 1, characterized in that, The circulating reactor (4) is equipped with a hydrogen regulating valve (41), which is connected to the circulating reactor (4) and the hydrogen addition assembly (5).
6. The waste mineral oil recycling pretreatment system according to claim 1, characterized in that, The catalyst feeding device (3) is equipped with a feeding sensor and is used to add oil-soluble metal catalysts into the agitator (2).
7. The waste mineral oil recovery pretreatment system according to claim 1, characterized in that, The hydrogenation assembly (5) is a new hydrogen compressor; the new hydrogen compressor is used to supply hydrogen to the circulating reactor (4).