Highly integrated oil-containing waste hydrothermal liquefaction and supercritical water oxidation system and method for treating oil-containing waste by using same

Abstract

The invention relates to a highly integrated hydrothermal liquefaction and supercritical water oxidation system for oily wastes. The system comprises a material tank, a reactor, a cooler, a softened water tank and a hydrogen peroxide tank, a discharge port of the material tank is connected with an inlet of the reactor through the material pump and the heater in sequence, an outlet of the reactor is connected with an inlet of the cooler, and an outlet of the cooler is connected with an inlet of the three-phase separator; the softened water tank is connected with a cooling water pump, the cooling water pump is respectively communicated with cavities in the inner walls of the reactor and the cooler, and the hydrogen peroxide tank is connected with an inlet of the reactor through a hydrogen peroxide pump. The invention aims to realize efficient treatment of oil-containing wastes by combining a hydrothermal liquefaction technology and a supercritical water oxidation technology, and solves the problems of low integration level, large occupied area, complex operation and high energy consumption of the existing hydrothermal liquefaction and supercritical water oxidation equipment.

Description

Technical Field

[0001] The present invention belongs to the technical field of waste treatment, and specifically relates to a highly integrated hydrothermal liquefaction and supercritical water oxidation system for oily waste, and also relates to a method for treating oily waste using the highly integrated hydrothermal liquefaction and supercritical water oxidation system for oily waste. Background Art

[0002] With the acceleration of the industrialization process, oily waste (such as oil sludge, oil residue, wastewater, etc.) has become one of the main sources of environmental pollution. These wastes contain a large amount of organic matter and oil. If not effectively treated, they may cause soil and water pollution. Therefore, how to efficiently, safely and energy-savingly treat these oily wastes has become an important topic in the research of waste treatment technology.

[0003] Traditional waste treatment methods, such as incineration, landfilling, physical and chemical methods, etc., have certain limitations in terms of treatment efficiency, environmental impact, equipment investment and operation cost. In recent years, hydrothermal liquefaction technology and supercritical water oxidation technology, as emerging waste treatment technologies, have received extensive attention due to their advantages such as high treatment efficiency, strong adaptability and good environmental protection.

[0004] The hydrothermal liquefaction technology converts organic substances into recoverable oil products and gases under high temperature and high pressure conditions, while the supercritical water oxidation technology can utilize the strong oxidizing property of supercritical water to oxidize organic pollutants in the waste into harmless carbon dioxide and water, so as to achieve the effects of harmlessness and resource utilization.

[0005] However, the existing hydrothermal liquefaction and supercritical water oxidation equipment on the market has problems such as low integration degree, large floor area, complex operation and high energy consumption, which limits its application in small and medium-sized waste treatment. Therefore, there is an urgent need for an integrated, modular, energy-saving and efficient waste treatment system that can achieve high integration and energy conservation and consumption reduction of equipment while meeting different treatment requirements. Summary of the Invention

[0006] The first object of the present invention is to provide a highly integrated hydrothermal liquefaction and supercritical water oxidation system for oily waste, aiming to achieve efficient treatment of oily waste by combining hydrothermal liquefaction technology and supercritical water oxidation technology, and solve the problems of low integration degree, large floor area, complex operation and high energy consumption existing in the existing hydrothermal liquefaction and supercritical water oxidation equipment.

[0007] To achieve the above object, the technical solution adopted by the present invention is: a highly integrated hydrothermal liquefaction and supercritical water oxidation system for oily waste, including a box body, in which a material tank, a reactor, a cooler, a softened water tank and a hydrogen peroxide tank are arranged; the discharge port of the material tank is sequentially connected to the inlet of the reactor through a material pump and a heater, the outlet of the reactor is connected to the inlet of the cooler, and the outlet of the cooler is connected to the inlet of a three-phase separator; the softened water tank is connected with a cooling water pump, and the cooling water pump is respectively communicated with the cavities in the inner walls of the reactor and the cooler, and the hydrogen peroxide tank is connected to the inlet of the reactor through a hydrogen peroxide pump.

[0008] The technical solution of the present invention also has the following characteristics: Two outlets of the three-phase separator are respectively connected to the inlets of an oil storage tank and a water storage tank.

[0009] The temperature heated by the heater is 350 °C.

[0010] It also includes a controller, and the controller controls the start and stop of the heater, the cooling water pump and the hydrogen peroxide pump.

[0011] The hydrogen peroxide tank is arranged in the softened water tank.

[0012] It also includes a cooling tank, and the cooling tank is used to receive the cooling water discharged from the reactor and the cooler.

[0013] The second object of the present invention is to provide a method for treating oily waste using a highly integrated hydrothermal liquefaction and supercritical water oxidation system for oily waste, aiming to combine the hydrothermal liquefaction technology with the supercritical water oxidation technology to achieve efficient treatment of oily waste and solve the problems of low integration, large floor area, complex operation and high energy consumption existing in the existing hydrothermal liquefaction and supercritical water oxidation equipment.

[0014] To achieve the above object, the first technical solution adopted by the present invention is: a method for treating oily waste using a highly integrated hydrothermal liquefaction and supercritical water oxidation system for oily waste, Under subcritical hydrothermal conditions: the oily waste is first transported to the heater through a material pump, and after being heated to 350 °C, it enters the reactor for hydrothermal liquefaction treatment; the organic matter in the waste is converted into oil and gas during the hydrothermal liquefaction process, and the volume of the waste is reduced. The reacted material is cooled by the cooler and then enters the three-phase separator to separate the oil phase and the water phase. The oil phase is diverted to the oil storage tank, and the water phase is diverted to the water storage tank.

[0015] To achieve the above object, the second technical solution adopted by the present invention is: a method for treating oily waste using a highly integrated hydrothermal liquefaction and supercritical water oxidation system for oily waste, Under supercritical water oxidation conditions: To further harmlessly treat waste, hydrogen peroxide is transported from the hydrogen peroxide tank in the softened water tank to the reactor through a hydrogen peroxide pump and participates in the supercritical water oxidation reaction. The supercritical water oxidation technology utilizes the strong oxidizing property of supercritical water to completely oxidize organic pollutants in the waste into harmless carbon dioxide and water, achieving the harmless treatment of waste.

[0016] The beneficial effects of the present invention are as follows: (1) The highly integrated hydrothermal liquefaction and supercritical water oxidation system for oily waste of the present invention adopts a highly integrated design, organically combines the hydrothermal liquefaction and supercritical water oxidation technologies, has a compact system design, small equipment floor area, is suitable for road transportation, and is convenient for on-site rapid installation and commissioning. The system has good modular characteristics and can be flexibly configured with single or multiple sets of equipment according to actual needs to adapt to different scales of treatment requirements; (2) The highly integrated hydrothermal liquefaction and supercritical water oxidation system for oily waste of the present invention adopts full-automatic control, greatly reduces manual intervention, and is easy to operate. The equipment runs stably and has a high degree of automation, which can reduce the complexity of personnel operation and improve production efficiency. At the same time, due to the compact system structure and low failure rate, the maintenance cost is also effectively controlled; (3) The highly integrated hydrothermal liquefaction and supercritical water oxidation system for oily waste of the present invention achieves the goal of energy-saving and high-efficiency through optimizing the system structure and operation process. The designs such as the recycling of cooling water and heat recovery effectively reduce energy consumption; the modular design enables the equipment to maintain a high treatment efficiency at different scales and maximally saves energy. Description of the Drawings

[0017] The drawings described herein are used to provide a further understanding of the present invention, form a part of the present invention, and the schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings: Figure 1 is a structural schematic diagram of a highly integrated hydrothermal liquefaction and supercritical water oxidation system for oily waste of the present invention.

[0018] In the figure, 1. cooler; 2. reactor; 3. cooling water tank; 4. oil storage tank; 5. three-phase separator; 6. water storage tank; 7. cooling tank; 8. heater; 9. controller; 10. material tank; 11. material pump; 12. oxidant pump; 13. cooling water pump, 14. box body. Detailed Embodiments

[0019] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation to the present invention.

[0020] In the description of the present invention, unless otherwise clearly defined, terms such as "set", "installed", "connected", etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific content of the technical solution.

[0021] Example 1 As Figure 1 shown, a highly integrated hydrothermal liquefaction and supercritical water oxidation system for oily waste of the present invention includes a material tank 10, a reactor 2, a cooler 1, a softened water tank 3 and a hydrogen peroxide tank located in a box body 14.

[0022] The outlet of the material tank 10 is sequentially connected to the inlet of the reactor 2 through a material pump 11 and a heater 8. The outlet of the reactor 2 is connected to the inlet of the cooler 1, and the outlet of the cooler 1 is connected to the inlet of a three-phase separator 5. The softened water tank 3 is connected with a cooling water pump 13, and the cooling water pump 13 is respectively communicated with the cavities in the inner walls of the reactor 2 and the cooler 1. The hydrogen peroxide tank is connected to the inlet of the reactor 2 through a hydrogen peroxide pump 12.

[0023] Wherein: The material tank 10 is used for storing oily waste; The material pump 11 is used for feeding the material from the material tank 10 into the heater 8; The heater 8 is used for heating the material to 350 °C; The reactor 2 is used for recovering and reforming waste oil under subcritical hydrothermal conditions, or for harmless treatment of waste liquid under supercritical water oxidation conditions; The cooler 1 is used for cooling the reacted material; The three-phase separator 5 is used for separating oil, water and other impurities; The cooling equipment composed of the softened water tank 3 and the cooling water pump 13 is used for cooling the system to ensure the safe operation of the equipment.

[0024] During operation, the material is fed from the material tank 10 into the heater 8 by the material pump 11 and heated to 350 °C, and then enters the reactor 2.

[0025] Under subcritical hydrothermal conditions, when performing the hydrothermal liquefaction process to produce oil in the reactor 2: The material is transported from the material tank 10 to the heater 8 by the material pump 11 for heating until the material temperature rises to 350 °C. Then, the material is transported to the reactor 2 for hydrothermal liquefaction reaction to recover oil products. After the hydrothermal liquefaction reaction, the material enters the cooler 1 for cooling, and the cooled material is discharged.

[0026] Under supercritical water oxidation conditions, when the supercritical water oxidation harmless treatment process is carried out in reactor 2: To further carry out harmless treatment of the waste, hydrogen peroxide is transported from the hydrogen peroxide tank in the softened water tank 3 to reactor 2 through the hydrogen peroxide pump 12 and participates in the supercritical water oxidation reaction; The supercritical water oxidation technology utilizes the strong oxidizing property of supercritical water to completely oxidize the organic pollutants in the waste into harmless carbon dioxide and water, realizing the harmless treatment of the waste.

[0027] In addition, the highly integrated hydrothermal liquefaction and supercritical water oxidation system for oily waste of the present invention further includes a set of cooling water system and temperature control system to ensure the stable operation of each device and avoid potential safety hazards caused by too high or too low temperature. When working specifically, the cooling water in the softened water tank 3 is introduced into the cavities in the inner walls of reactor 2 and cooler 1 respectively through the cooling water pump 13 to implement cooling.

[0028] By integrating the hydrothermal liquefaction and supercritical water oxidation technologies, the present invention designs a waste treatment system with the characteristics of high integration, modularization, energy saving and high efficiency, solves the deficiencies in the prior art, and has broad application prospects.

[0029] Example 2 As Figure 1 shown, different from Example 1, in the highly integrated hydrothermal liquefaction and supercritical water oxidation system for oily waste of the present invention in this Example 2: The two outlets of the three-phase separator 5 are respectively connected to the inlets of the oil storage tank 4 and the water storage tank 6.

[0030] The material at the outlet of reactor 2 is cooled by cooler 1 and then enters the three-phase separator 5 for oil-liquid separation. The oil is finally split and stored in the oil storage tank 4, and the water is finally split and stored in the water storage tank 6 respectively for centralized storage, which is convenient for centralized management.

[0031] Example 3 As Figure 1 shown, different from Example 2, in the highly integrated hydrothermal liquefaction and supercritical water oxidation system for oily waste of the present invention in Example 3: It further includes a controller 9, and the controller 9 controls the start and stop of the heater 8, the cooling water pump 13, and the hydrogen peroxide pump 12.

[0032] Full automation control is adopted, greatly reducing manual intervention and being easy to operate. The equipment runs stably and has a high degree of automation, which can reduce the complexity of personnel operation and improve production efficiency.

[0033] Example 4 As Figure 1As shown, different from Embodiment 3, in a highly integrated hydrothermal liquefaction and supercritical water oxidation system for oily waste in Embodiment 4 of the present invention: the hydrogen peroxide tank is arranged in the softened water tank 3, which can make full use of the space and reduce the overall design volume. This makes the whole system design compact, with a small floor area of the equipment, suitable for road transportation, and convenient for on-site quick installation and debugging.

[0034] Embodiment 5 As Figure 1 shown, different from Embodiment 4, in a highly integrated hydrothermal liquefaction and supercritical water oxidation system for oily waste in Embodiment 5 of the present invention: it further includes a cooling tank 7. The cooling tank 7 is used to receive the cooling water discharged from the reactor 2 and the cooler 1, and after being cooled to below 80°C together with tap water, it is discharged, reducing the impact on the environment.

[0035] Embodiment 6 Combined Figure 1 , a start-up control method of a highly integrated hydrothermal liquefaction and supercritical water oxidation system for oily waste of the present invention, Under subcritical hydrothermal conditions, when performing the hydrothermal liquefaction to produce oil process in the reactor 2: the oily waste is first transported to the heater 8 through the material pump 11, and after being heated to 350°C, it enters the reactor 2 for hydrothermal liquefaction treatment; during the hydrothermal liquefaction process, the organic matter in the waste is converted into oil and gas, and the volume of the waste is reduced. The reacted material is cooled by the cooler 1 and then enters the three-phase separator 5 to separate the oil phase and the water phase. The oil phase is diverted to the oil storage tank 4, and the water phase is diverted to the water storage tank 6.

[0036] Under supercritical water oxidation conditions, when performing the supercritical water oxidation and harmless treatment process in the reactor 2: to further perform harmless treatment on the waste, hydrogen peroxide is transported from the hydrogen peroxide tank in the softened water tank 3 to the reactor 2 through the hydrogen peroxide pump 12 and participates in the supercritical water oxidation reaction; the supercritical water oxidation technology utilizes the strong oxidizing property of supercritical water to completely oxidize the organic pollutants in the waste into harmless carbon dioxide and water, realizing the harmless treatment of the waste.

[0037] Therefore, compared with the prior art, a highly integrated hydrothermal liquefaction and supercritical water oxidation system for oily waste of the present invention has the following advantages: (1) The highly integrated hydrothermal liquefaction and supercritical water oxidation system for oily waste of the present invention adopts a highly integrated design, organically combines the hydrothermal liquefaction and supercritical water oxidation technologies, has a compact system design, a small floor area of the equipment, is suitable for road transportation, and is convenient for on-site quick installation and debugging. The system has good modular characteristics and can be flexibly configured with single or multiple sets of equipment according to actual needs to adapt to different scales of treatment requirements; (2) The highly integrated hydrothermal liquefaction and supercritical water oxidation system for oily waste of the present invention adopts full-automatic control, greatly reducing manual intervention and being easy to operate. The equipment runs stably and has a high degree of automation, which can reduce the complexity of personnel operation and improve production efficiency. At the same time, due to the compact system structure and low failure rate, the maintenance cost is also effectively controlled; (3) The highly integrated hydrothermal liquefaction and supercritical water oxidation system for oily waste of the present invention achieves the goal of energy-saving and high-efficiency by optimizing the system structure and operation process. The design of recycling cooling water and heat recovery effectively reduces energy consumption; the modular design enables the equipment to maintain a high treatment efficiency at different scales, maximizing energy conservation.

[0038] The above description shows and describes several preferred embodiments of the invention. However, as mentioned above, it should be understood that the invention is not limited to the form disclosed herein, should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be changed within the scope of the inventive concept described herein through the above teachings or the technology or knowledge in the relevant field. And any changes and modifications made by those skilled in the art without departing from the spirit and scope of the invention shall fall within the protection scope of the appended claims of the invention.

Claims

1. A highly integrated oily waste hydrothermal liquefaction and supercritical water oxidation system, characterized by: The invention comprises a box (14), wherein a material tank (10), a reactor (2), a cooler (1), a softened water tank (3) and a hydrogen peroxide tank are arranged in the box (14); the discharge port of the material tank (10) is connected to the inlet of the reactor (2) via a material pump (11) and a heater (8) in sequence, the outlet of the reactor (2) is connected to the inlet of the cooler (1), and the outlet of the cooler (1) is connected to the inlet of a three-phase separator (5); the softened water tank (3) is connected to a cooling water pump (13), and the cooling water pump (13) is respectively connected to the cavities in the inner walls of the reactor (2) and the cooler (1); and the hydrogen peroxide tank is connected to the inlet of the reactor (2) via a hydrogen peroxide pump (12).

2. The highly integrated oily waste hydrothermal liquefaction and supercritical water oxidation system according to claim 1 is characterized in that: The two outlets of the three-phase separator (5) are respectively connected to the inlets of the oil storage tank (4) and the water storage tank (6).

3. The highly integrated oily waste hydrothermal liquefaction and supercritical water oxidation system according to claim 2 is characterized in that: The heating temperature of the heater (8) is 350°C.

4. The highly integrated oily waste hydrothermal liquefaction and supercritical water oxidation system according to claim 3 is characterized in that: It also includes a controller (9), wherein the controller (9) controls the start and stop of the heater (8), the cooling water pump (13), and the hydrogen peroxide pump (12).

5. The highly integrated oily waste hydrothermal liquefaction and supercritical water oxidation system according to claim 4, characterized in that: The hydrogen peroxide tank is arranged in the softened water tank (3).

6. The highly integrated oily waste hydrothermal liquefaction and supercritical water oxidation system according to claim 5, characterized in that: It also includes a cooling tank (7), which is used to receive cooling water discharged from the reactor (2) and the cooler (1).

7. A method for treating oily waste using the highly integrated oily waste hydrothermal liquefaction and supercritical water oxidation system according to any one of claims 1 to 6, characterized in that: Under subcritical hydrothermal conditions: the oily waste is first transported to the heater 8 through a material pump (11), and after being heated to 350° C., enters the reactor (2) for hydrothermal liquefaction treatment; the hydrothermal liquefaction process converts organic matter in the waste into oil and gas, and reduces the volume of the waste. The reacted material is cooled by a cooler (1) and then enters a three-phase separator (5) to separate the oil phase and the water phase. The oil phase is diverted to an oil storage tank (4), and the water phase is diverted to a water storage tank (6).

8. A method for treating oily waste using the highly integrated oily waste hydrothermal liquefaction and supercritical water oxidation system according to any one of claims 1 to 6, characterized in that: Under supercritical water oxidation conditions: in order to further render the waste harmless, hydrogen peroxide is transported from the hydrogen peroxide tank in the softening water tank (3) to the reactor (2) via a hydrogen peroxide pump (12) to participate in the supercritical water oxidation reaction; the supercritical water oxidation technology utilizes the strong oxidizing property of supercritical water to completely oxidize the organic pollutants in the waste into harmless carbon dioxide and water, thereby achieving harmless treatment of the waste.

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