A wastewater treatment system and process based on supercritical water oxidation

Abstract

The application relates to a wastewater treatment system based on supercritical water oxidation, which comprises a wastewater treatment tank mechanism, the wastewater treatment tank mechanism comprising a main tank body base, a main tank body, a secondary tank base, a secondary tank body, a heating port, a liquid inlet port, a secondary tank liquid outlet port, a main tank liquid inlet pipe, a liquid inlet control valve, a main tank liquid outlet port, left and right sealing end covers, a heat preservation layer and an inner lining layer; the main tank body is fixedly arranged on the main tank body base, the secondary tank body is fixedly arranged on the main tank body through multiple groups of the secondary tank base, the liquid inlet port is fixedly arranged on the top of the secondary tank body, and the heating port is arranged on the side end face of the secondary tank body; the application can effectively reduce heating energy consumption, optimize the anticorrosion treatment of the whole tank body, reduce equipment production cost, improve the corrosion of the wastewater preheating link on the inner wall of the tank body, improve pressure control precision, improve the oxygen inlet mode, reduce the phenomenon that inorganic salts are deposited or attached to the inner wall of the pipe due to a long reaction period, and block the tank body and the pipeline.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to a wastewater treatment system and process based on supercritical water oxidation. Background Technology

[0002] Supercritical water oxidation is an advanced waste treatment technology, particularly suitable for treating wastewater and solid waste containing high concentrations of organic matter or toxic and hazardous substances. This technology is based on the principle that water becomes a supercritical fluid under temperature and pressure conditions exceeding its critical point (374°C, 22.1 MPa). In the supercritical state, the physicochemical properties of water undergo significant changes, including increased density, decreased viscosity, increased diffusion coefficient, and decreased dielectric constant. This allows many organic substances and oxygen that are normally insoluble or sparingly soluble in water to dissolve highly in supercritical water and form a homogeneous mixture.

[0003] In the SCWO process, the waste to be treated is first pretreated to better mix with supercritical water, and then reacted in the reactor with oxygen (or other oxidants) under high temperature and pressure. Under these conditions, the organic matter rapidly oxidizes with oxygen, decomposing into basic harmless products such as carbon dioxide (CO2), water (H2O), nitrogen (N2), and other stable salts. Elements such as sulfur (S) and phosphorus (P) are converted into higher-valence salts, and heavy metals are stably solidified in the ash after oxidation.

[0004] This technology features rapid reaction, high oxidation efficiency, and harmless products, making it highly effective for treating wastewater containing complex organic components that is difficult to treat using conventional methods. However, due to its demanding operating conditions, high-quality equipment and materials, and the potential for corrosion and scaling, it faces certain technical and economic challenges in practical applications. Nevertheless, supercritical water oxidation technology is still considered one of the most promising advanced oxidation technologies, with broad application prospects in the environmental protection field.

[0005] Under supercritical conditions, organic pollutants can mix thoroughly with water and oxygen, achieving a highly efficient oxidation reaction. Even complex organic matter can be almost completely oxidized into non-toxic small molecules such as carbon dioxide, water, nitrogen, and harmless salts within a short time. The treatment is thorough: the removal rate of toxic substances is extremely high, typically exceeding 99.99%, significantly reducing harmful components in the final emissions and meeting stringent environmental standards. Because the reaction takes place in a high-temperature, high-pressure homogeneous environment, the reaction rate is greatly increased, and the residence time is extremely short, usually between a few seconds and a few minutes, which helps reduce reactor volume and cost. It is suitable for treating various types of toxic and hazardous wastes and wastewaters, including but not limited to recalcitrant organic matter, medical waste, chemical wastewater, petroleum refining byproducts, and pesticide residues.

[0006] The specific working steps are as follows: Pretreatment: First, the wastewater undergoes appropriate pretreatment to remove large particulate impurities and substances that may damage the equipment. Simultaneously, organic matter may be concentrated to improve treatment efficiency. Pressurization and Heating: The wastewater is pressurized to the pressure range of supercritical water using a high-pressure pump and heated to above the temperature of supercritical water using a heater. Dissolution and Reaction: In the supercritical state, the solubility of water is greatly enhanced, capable of dissolving most organic matter and oxygen, forming a homogeneous oxidation environment. At this time, organic matter reacts rapidly with dissolved oxygen to produce carbon dioxide, water, and harmless salts. Oxidation Reaction: Under high temperature, high pressure, and the presence of oxygen, organic matter is rapidly oxidized and decomposed, completing the breaking and recombination of chemical bonds to form small, harmless molecule products. Product Separation: The supercritical water after the reaction is cooled and depressurized, causing the oxidation products to revert to a gaseous, liquid, or solid state. These products are then separated from the aqueous phase using physical separation techniques such as condensation, distillation, or precipitation. Heat recovery: A large amount of heat is released during the reaction process. This energy can sometimes be recovered through a heat exchanger to maintain the self-heating operation of the system or to be converted into other forms of energy use.

[0007] Supercritical water oxidation technology utilizes the unique properties of supercritical water to achieve highly effective oxidation and harmless treatment of organic waste.

[0008] For example, application number 202210129253.3 provides a supercritical water oxidation system, relating to the field of environmental protection technology. The system includes a pretreatment chamber, a reaction chamber, and a heat exchanger; the pretreatment chamber and the reaction chamber can be interconnected or separated; the heat exchanger has a sludge fluid inlet, a sludge fluid outlet, a tail gas inlet, and a tail gas outlet. The tail gas inlet is connected to the reaction chamber, and both the sludge fluid outlet and the tail gas outlet are connected to the pretreatment chamber. The heat exchanger is used to achieve heat exchange between the sludge fluid and the tail gas. The supercritical water oxidation system provided by this invention reduces the heating required for the pretreatment chamber, reduces the heating cost of the pretreatment chamber, and also improves the energy utilization rate of the supercritical water oxidation system, effectively saving energy.

[0009] However, current supercritical wastewater treatment systems often suffer from high heating energy consumption, high equipment production costs due to the need for overall tank corrosion protection, and severe corrosion of the tank inner wall during wastewater preheating. Inaccurate pressure control leads to unstable pressure control in the reaction environment; the simple oxygen supply method results in uneven contact between the waste liquid and oxygen, low oxidation rate, slow oxidation reaction speed, and long reaction cycle. This long reaction cycle causes inorganic salts to settle or adhere to the pipe walls, clogging the tank and pipelines; and the inaccurate control of oxygen supply pressure and flow rate leads to over-oxygenation, producing large amounts of inorganic substances. Summary of the Invention

[0010] The technical problems to be solved by this invention are: reducing heating energy consumption; optimizing the overall anti-corrosion treatment of the tank body to reduce equipment production costs; improving the corrosion of the inner wall of the tank during wastewater preheating; improving pressure control accuracy and stability of reaction environment pressure control; improving the oxygen intake method to increase the uniformity of contact between waste liquid and oxygen, increase the oxidation rate, increase the oxidation reaction speed, reduce the reaction cycle, and reduce the phenomenon of inorganic salt precipitation or adhesion to the pipe wall, clogging the tank and pipeline due to a long reaction cycle; and improving the control accuracy of oxygen intake pressure and flow rate to improve the phenomenon of over-oxygenation reaction and the generation of a large amount of inorganic matter caused by unstable oxygen intake pressure and flow rate control.

[0011] To solve the above-mentioned technical problems, the present invention provides a wastewater treatment system based on supercritical water oxidation, including a wastewater treatment tank mechanism. The wastewater treatment tank mechanism includes a main tank base, a main tank, a secondary tank base, a secondary tank, a heating port, a liquid inlet, a secondary tank drain port, a main tank inlet pipe, a liquid inlet control valve, a main tank drain port, left and right closed end caps, an insulation layer, and an inner lining layer. The main tank is fixedly mounted on the main tank base, and the secondary tank is fixedly mounted on the main tank via multiple sets of secondary tank bases. A liquid inlet is fixedly mounted on the top of the secondary tank. A heating port is provided on one end face of the auxiliary tank. A drain port is fixedly provided at the middle of the bottom of the auxiliary tank. Multiple sets of main tank inlet pipes are fixedly provided between the main tank and the auxiliary tank. Each set of main tank inlet pipes is fixedly provided with an inlet control valve. A drain port is fixedly provided on one side of the bottom of the main tank. Two sets of left and right closed end caps are provided and fixedly provided on both ends of the main tank. An insulation layer is provided inside the main tank. An inner lining layer is provided inside the insulation layer. Two sets of wastewater treatment tank mechanisms are provided and arranged side by side.

[0012] The wastewater treatment tank is equipped with a two-stage heating mechanism for heating the reaction environment.

[0013] The wastewater treatment tank is equipped with a pressure control mechanism that controls the pressure of the reaction space.

[0014] Preferably, the dual-stage heating mechanism includes a flange heater and an induction heater; the flange heater is fixedly installed at the heating port on the auxiliary tank, and the induction heater is fixedly installed between the insulation layer and the inner lining layer inside the main tank.

[0015] Preferably, the flange heater includes a supporting flange, a straight cylinder, a cover, a U-shaped heating tube, and a fan-shaped fixing bracket; the supporting flange is fixedly disposed at the heating port, the straight cylinder is fixedly disposed on the side of the supporting flange away from the heating port, and a cover is fixedly disposed on the other side; multiple sets of U-shaped heating tubes are disposed evenly on the supporting flange and fixed by multiple sets of the fan-shaped fixing brackets.

[0016] Preferably, the induction heater is composed of multiple sets of square rigid copper tubes, and each set of square rigid copper tubes is spirally spaced and evenly fixed on the outer wall of the inner lining layer.

[0017] Preferably, the pressure control mechanism includes a main wastewater pipe, a primary pump, a secondary pump, a tertiary pump, a wastewater inlet pipe, a distribution pipe, a primary pressure gauge, a pressure regulating valve, a secondary pressure gauge, a pipe outlet, a pressure relief valve, a connecting pressure relief pipe, a pipe pressure relief port, and a control box. The primary, secondary, and tertiary pumps are respectively connected to the main wastewater pipe, and their outputs are connected in parallel and converged to the wastewater inlet pipe. One end of the wastewater inlet pipe is divided into left and right paths by the distribution pipe. A pressure regulating valve is fixedly installed on each distribution pipe, and the pressure regulating valve... Each of the two sides of the pipeline is fixedly equipped with a primary pressure gauge and a secondary pressure gauge. One end of the outlet of each set of the liquid distribution pipe is connected to the liquid distribution pipe, and the other end is fixedly connected to the liquid inlet on the auxiliary tank. A pressure relief valve is fixedly installed on the front end of the liquid distribution pipe near the primary pressure gauge. The two sets of pressure relief valves on the two liquid distribution pipes are connected in series to the confluence pressure relief pipe through the pipeline, and a pipe pressure relief port is fixedly installed at its tail to connect to the wastewater inlet equipment. The control box is fixedly installed on one side of the main wastewater pipe.

[0018] Preferably, the wastewater treatment system based on supercritical water oxidation further includes a multi-point oxygen supply mechanism, which includes an oxygen inlet, a multi-channel oxygen outlet nozzle, and a liquid-distributing spray pipe. The oxygen inlet is provided in multiple sets, which are uniformly and fixedly arranged at the bottom of the main tank. The multi-channel oxygen outlet nozzle is fixedly arranged above the oxygen inlet, contacts the inner lining layer, and enters the inner surface of the inner lining layer tangentially through the multi-channel liquid-distributing spray pipe.

[0019] Preferably, the multi-point oxygen supply mechanism further includes an oxygen inlet pipeline, a priority compensation tank, a pressure stabilizing tank, a primary oxygen supply pressure gauge, a secondary oxygen supply pressure gauge, and an oxygen supply pipeline outlet; the oxygen inlet pipeline is divided into multiple groups, each evenly connected to multiple groups of oxygen inlets, and the primary oxygen supply pressure gauge, the priority compensation tank, the secondary oxygen supply pressure gauge, the pressure stabilizing tank, and the oxygen supply pipeline outlet are sequentially and fixedly connected between the oxygen inlet pipeline and the oxygen inlet; the oxygen supply pipeline outlet is fixedly connected to the oxygen inlet.

[0020] Preferably, the wastewater treatment system based on supercritical water oxidation further includes a tank cleaning mechanism, which includes an air inlet, a pipe wall cleaning piston, a large-diameter chip discharge port, a filter box, and filter silicon steel wool. Two sets of left and right closed end caps fixedly mounted on both ends of the main tank are respectively provided with air inlets, which are connected to an external air compressor. The pipe wall cleaning piston is movably mounted within the inner lining. The lining has a large-diameter chip discharge port located at the main tank drain outlet, and a filter box is fixedly mounted between the lining and the main tank drain outlet. Filter silicon steel wool is fixedly mounted inside the filter box.

[0021] Preferably, the pipe wall cleaning piston includes a piston support plate, a primary cleaning scraper, a chip discharge groove, a secondary cleaning scraper, and a sealing ring; the primary cleaning scraper is fixedly sleeved on the piston support plate, and multiple sets of uniform chip discharge grooves are formed along its outer circumference on the primary cleaning scraper; the secondary cleaning scraper is fixedly sleeved on the piston support plate; the sealing ring is fixedly sleeved on the piston support plate; the secondary cleaning scraper is located between the primary cleaning scraper and the sealing ring; the pipe wall cleaning piston is movably disposed within the inner lining layer; and the primary cleaning scraper is located near the large-diameter chip discharge port.

[0022] A wastewater treatment process based on supercritical water oxidation includes the following steps:

[0023] S1. Wastewater enters the wastewater inlet pipe after being pressurized by the primary pump, secondary pump and tertiary pump. After being divided into left and right streams by the distribution pipe, the wastewater enters the inlet through the pipe outlet and then enters the auxiliary tank.

[0024] S2. Wastewater enters the auxiliary tank through the inlet, is heated by the flange heater, and then enters the inner lining of the main tank through the main tank inlet pipe. The induction heater heats the wastewater in the inner lining to a specified temperature and then performs an oxidation reaction. After the reaction, the wastewater is discharged through the main tank outlet.

[0025] S3. Oxygen enters through the oxygen inlet pipeline, then through the first-level oxygen supply pressure gauge into the priority compensation tank, then through the second-level oxygen supply pressure gauge into the pressure stabilizing tank, then through the oxygen supply pipeline outlet into the oxygen inlet, and finally through the liquid-distributing nozzle on the multi-channel oxygen outlet nozzle into the inner lining of the main tank for oxidation reaction.

[0026] S4. When the inner wall of the liner needs to be cleaned regularly, the air inlet on the left is connected to the air compressor. The pipe wall cleaning piston moves to the right along the inner wall of the liner under the action of air pressure. The first-stage cleaning scraper divides and scrapes the liner. The second-stage cleaning scraper scrapes the remaining part of the liner a second time. The particles are discharged through the chip discharge groove and pushed to the large-diameter chip discharge port to enter the filter box for discharge.

[0027] S5. After cleaning, the air inlet on the right is connected to the air compressor. The pipe wall cleaning piston moves to the left along the inner wall of the inner lining under the action of air pressure and returns to the initial position.

[0028] Compared with the prior art, the beneficial effects of the present invention are:

[0029] 1. By setting up an insulation layer, the heat loss from the cavity is effectively reduced, which helps to reduce heating energy consumption and provides a guarantee for the secondary recycling of liquids after high temperature and high pressure oxidation. By setting up an inner lining, only the inner lining needs to be treated with anti-corrosion materials, avoiding the need to treat the entire tank, thus reducing production costs and resource waste.

[0030] 2. By setting up a dual-stage heating mechanism and eliminating the preheating stage, wastewater is rapidly heated as it enters the auxiliary tank and simultaneously enters the main tank. After entering the main tank, it continues to be rapidly heated to the set temperature. By improving the heating method, the corrosion of the inner wall of the tank during the wastewater preheating stage is effectively reduced.

[0031] 3. By setting up multiple sets of square rigid copper tube induction heaters, the heat conduction rate is greatly improved, the heating efficiency is increased, the heating time is reduced, the reaction cycle is shortened, the degradation efficiency is improved, and the corrosion of the tube wall by wastewater during the heating process is reduced.

[0032] 4. By setting up primary, secondary, and tertiary pumps, the set pressure value is achieved through a step-by-step pressurization method, reducing equipment energy consumption. When the pressurizing pump is damaged, it is easy to replace and the maintenance cost is low.

[0033] 5. By setting up a primary pressure gauge, a pressure regulating valve, and a secondary pressure gauge, the pipeline pressure is measured bidirectionally at the valve-controlled position, thereby improving the accuracy of pressure control and the stability of pressure control in the reaction environment.

[0034] 6. By setting up a multi-point oxygen supply mechanism, oxygen enters the reaction chamber through multi-component liquid nozzles on multiple sets of multi-channel oxygen outlet nozzles, which improves the uniformity of contact between waste liquid and oxygen, fully improves the oxidation rate, increases the oxidation reaction speed, and reduces the reaction cycle. At the same time, it effectively avoids inorganic salt sedimentation or adhesion to the pipe wall due to the long reaction cycle.

[0035] 7. By setting up a priority compensation tank, a pressure stabilizing tank, a primary oxygen supply pressure gauge, and a secondary oxygen supply pressure gauge, the control accuracy of the oxygen supply pressure and flow rate is improved. This ensures a highly efficient oxidation reaction process within the reactor and effectively avoids the phenomenon of over-oxygenation caused by unstable control of the oxygen supply pressure and flow rate, which would generate a large amount of inorganic matter.

[0036] 8. By setting up a tank cleaning mechanism with a primary cleaning scraper, chip removal groove, secondary cleaning scraper, and sealing ring, the air supply creates a pressure difference on both sides of the tank cleaning mechanism, which drives it to move linearly along the inner wall of the tank. The primary cleaning scraper has a chip removal groove to divide and dismantle the attached materials on the inner wall. The secondary cleaning scraper scrapes off the remaining material after dismantling, preventing excessive resistance due to the large size of the attached material, and effectively reducing cleaning energy consumption.

[0037] 9. By setting up large-diameter chip discharge ports, filter boxes, and filter silicon steel wool, the inorganic particles generated during the waste liquid reaction process can be effectively prevented from clogging the inner wall of the pipeline. Attached Figure Description

[0038] The present invention will now be described in further detail with reference to the accompanying drawings:

[0039] Figure 1 This is a right view of the present invention;

[0040] Figure 2 This is the front view of the present invention;

[0041] Figure 3 This is a top view of the present invention;

[0042] Figure 4 This is a three-dimensional structural diagram of the present invention;

[0043] Figure 5 for Figure 1 Schematic diagram of the cross section in the middle AA direction;

[0044] Figure 6 for Figure 5 Enlarged view of a portion of region B in the middle;

[0045] Figure 7 for Figure 5 Enlarged view of a portion of region C in the middle;

[0046] Figure 8 for Figure 3 Enlarged view of a portion of region D;

[0047] Figure 9 for Figure 4 Enlarged view of a portion of region E in the middle;

[0048] Figure 10 for Figure 3Enlarged view of a portion of region F in the middle;

[0049] Figure 11 for Figure 5 Enlarged view of a portion of region G in the middle;

[0050] Figure 12 for Figure 5 Enlarged view of a portion of region H in the middle;

[0051] Figure 13 This is a front view of the pipe wall cleaning piston of the present invention;

[0052] Figure 14 for Figure 5 Enlarged view of a portion of the J region;

[0053] In the diagram: 1. Wastewater treatment tank mechanism; 101. Main tank base; 102. Main tank; 103. Auxiliary tank base; 104. Auxiliary tank; 105. Heating port; 106. Liquid inlet; 107. Auxiliary tank drain port; 108. Main tank inlet pipe; 109. Liquid inlet control valve; 110. Main tank drain port; 111. Left and right closed end caps; 112. Insulation layer; 113. Inner lining layer; 2. Two-stage heating mechanism 201. Flange heater; 202. Support flange; 203. Straight cylinder; 204. Cover; 205. U-shaped heating tube; 206. Fan-shaped fixed bracket; 207. Induction heater; 208. Square rigid copper tube; 3. Pressure control mechanism; 301. Main wastewater pipe; 302. Primary pump; 303. Secondary pump; 304. Tertiary pump; 305. Wastewater inlet pipe; 306. Divider pipe; 307. Primary pressure gauge; 308. Pressure regulating valve; 309. Secondary pressure gauge; 310. Pipeline outlet; 311. Pressure relief valve; 312. Connecting pressure relief pipe; 313. Pipeline pressure relief port; 314. Control box; 4. Multi-point oxygen supply mechanism; 401. Oxygen inlet; 402. Multi-channel oxygen outlet nozzle; 403. Liquid distribution nozzle; 404. Oxygen inlet pipeline; 405. Priority compensation tank; 406. Pressure stabilizing tank; 4 07. Primary oxygen supply pressure gauge; 408. Secondary oxygen supply pressure gauge; 409. Oxygen supply pipeline outlet; 5. Tank cleaning mechanism; 501. Air inlet; 502. Pipe wall cleaning piston; 503. Large-diameter chip discharge port; 504. Filter box; 505. Filter silicon steel wool; 506. Piston support plate; 507. Primary cleaning scraper; 508. Chip discharge trough; 509. Secondary cleaning scraper; 510. Sealing ring; Detailed Implementation Example 1

[0054] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0055] Please see Figures 1-14 A wastewater treatment system based on supercritical water oxidation includes a wastewater treatment tank mechanism 1. The wastewater treatment tank mechanism 1 includes a main tank base 101, a main tank 102, a secondary tank base 103, a secondary tank 104, a heating port 105, a liquid inlet 106, a secondary tank drain port 107, a main tank inlet pipe 108, a liquid inlet control valve 109, a main tank drain port 110, left and right closed end caps 111, an insulation layer 112, and an inner lining layer 113. The main tank 102 is fixedly mounted on the main tank base 101. The secondary tank 104 is fixedly mounted on the main tank 102 via multiple sets of secondary tank bases 103. The secondary tank 104 has a liquid inlet 106 fixedly mounted on its top, a heating port 105 on one side end face, and a secondary tank drain port 107 fixedly mounted at the middle of its bottom. The main tank 102... Multiple sets of main tank inlet pipes 108 are fixedly installed between the main tank 102 and the auxiliary tank 104. Each set of main tank inlet pipes 108 is fixedly equipped with an inlet control valve 109. A main tank drain port 110 is fixedly installed on one side of the bottom of the main tank 102. Two sets of left and right closed end caps 111 are provided and fixedly installed on both ends of the main tank 102. An insulation layer 112 is provided inside the main tank 102. An inner lining layer 113 is provided inside the insulation layer 112. Two sets of wastewater treatment tank mechanisms 1 are provided and arranged side by side. By setting the insulation layer, the outward dissipation of the cavity temperature is effectively reduced, which helps to reduce heating energy consumption and provides a guarantee for the secondary recovery of liquid after high temperature and high pressure oxidation. By setting the inner lining layer, only the inner lining layer needs to be treated with anti-corrosion material, avoiding the need to treat the entire tank, reducing production costs and resource waste.

[0056] The wastewater treatment tank mechanism 1 is fixedly equipped with a two-stage heating mechanism 2 for heating the reaction environment;

[0057] The wastewater treatment tank mechanism 1 is fixedly equipped with a pressure control mechanism 3 for controlling the pressure of the reaction space.

[0058] In some embodiments, see Figure 5The dual-stage heating mechanism 2 includes a flange heater 201 and an induction heater 207. The flange heater 201 is fixedly installed at the heating port 105 on the auxiliary tank 104, and the induction heater 207 is fixedly installed between the insulation layer 112 and the inner lining layer 113 inside the main tank 102. In use, wastewater enters the auxiliary tank 104 through the inlet 106, is heated by the flange heater 201, and then enters the inner lining layer 113 inside the main tank 102 through the main tank inlet pipe 108. The induction heater 207 heats the wastewater in the inner lining layer 113 to a specified temperature and then performs an oxidation reaction. After the reaction, the wastewater is discharged through the main tank outlet 110. By setting up a dual-stage heating mechanism, the preheating stage is eliminated. The wastewater is rapidly heated upon entering the auxiliary tank and simultaneously enters the main tank. After entering the main tank, it continues to be rapidly heated to the set temperature. By improving the heating method, the corrosion of the inner wall of the tank during the wastewater preheating stage is effectively reduced.

[0059] In some embodiments, see Figure 6 The flange-type heater 201 includes a supporting flange 202, a straight cylinder 203, a cover 204, a U-shaped heating tube 205, and a fan-shaped fixing bracket 206. The supporting flange 202 is fixedly disposed on the heating port 105. The straight cylinder 203 is fixedly disposed on the side of the supporting flange 202 away from the heating port 105, and the cover 204 is fixedly disposed on the other side. Multiple sets of U-shaped heating tubes 205 are evenly fixedly disposed on the supporting flange 202 and fixed by multiple sets of fan-shaped fixing brackets 206.

[0060] In some embodiments, see Figure 7 The induction heater 207 is composed of multiple sets of square rigid copper tubes 208. Each set of square rigid copper tubes 208 is spirally spaced and uniformly fixed on the outer wall of the inner lining layer 113. By setting multiple sets of square rigid copper tubes in the induction heater, the heat conduction rate is greatly improved, the heating efficiency is improved, the heating time is reduced, the reaction cycle is shortened, the degradation efficiency is improved, and the corrosion of the tube wall by wastewater during the heating process is reduced.

[0061] In some embodiments, see Figure 8-9The pressure control mechanism 3 includes a main wastewater pipe 301, a primary pump 302, a secondary pump 303, a tertiary pump 304, a wastewater inlet pipe 305, a distribution pipe 306, a primary pressure gauge 307, a pressure regulating valve 308, a secondary pressure gauge 309, a pipe outlet 310, a pressure relief valve 311, a connecting pressure relief pipe 312, a pipe pressure relief port 313, and a control box 314; the primary pump 302, the secondary pump 303, and the tertiary pump 304 are respectively connected to the main wastewater pipe 301. The wastewater inlet pipe 305 is connected to the wastewater inlet pipe 306, and the wastewater inlet pipe 305 is divided into two branches, left and right, by the distribution pipe 306. Each distribution pipe 306 is fixedly equipped with a pressure regulating valve 308, and a primary pressure gauge 307 and a secondary pressure gauge 309 are fixedly installed on the pipes on both sides of the pressure regulating valve 308. One end of the pipe outlet 310 on each distribution pipe 306 is connected to the distribution pipe 306, and the other end is connected to the auxiliary tank 1. The inlet 106 on 04 is fixedly connected; a pressure relief valve 311 is fixedly installed on the front end of the distribution pipe 306 near the first-stage pressure gauge 307; two sets of pressure relief valves 311 on the two distribution pipes 306 are connected in series to the confluence pressure relief pipe 312, and a pipe pressure relief port 313 is fixedly installed at its end to connect to the wastewater inlet equipment; the control box 314 is fixedly installed on one side of the main wastewater pipe 301; in use, wastewater passes through the main wastewater pipe Pipe 301, after being pressurized in stages by the primary pump 302, secondary pump 303, and tertiary pump 304, enters the wastewater inlet pipe 305. It is then divided into left and right streams by the distributor pipe 306, which flow into the inlet 106 via the pipe outlet 310 and then into the auxiliary tank 104. By using primary, secondary, and tertiary pumps to achieve the set pressure value through step-by-step pressurization, energy consumption is reduced. When the pressurizing pumps fail, replacement is easy, and maintenance costs are low. The installation of a primary pressure gauge, a pressure regulating valve, and a secondary pressure gauge allows for bidirectional measurement of the pipeline pressure, improving pressure control accuracy and stability of the reaction environment pressure control.

[0062] In some embodiments, see Figure 11The wastewater treatment system based on supercritical water oxidation also includes a multi-point oxygen supply mechanism 4, which includes an oxygen inlet 401, a multi-channel oxygen outlet nozzle 402, and a liquid-distributing spray pipe 403. Multiple sets of oxygen inlets 401 are uniformly and fixedly located at the bottom of the main tank 102. The multi-channel oxygen outlet nozzles 402 are fixedly located above the oxygen inlets 401, contacting the inner lining layer 113, and entering the inner surface of the inner lining layer 113 tangentially through the multi-component liquid-distributing spray pipe 403. By setting up the multi-point oxygen supply mechanism, oxygen enters the reaction chamber through the multi-component liquid-distributing spray pipes on the multiple sets of multi-channel oxygen outlet nozzles, improving the uniformity of contact between the waste liquid and oxygen, significantly increasing the oxidation rate, accelerating the oxidation reaction, and reducing the reaction cycle. Simultaneously, it effectively prevents inorganic salts from settling or adhering to the pipe wall due to a long reaction cycle.

[0063] In some embodiments, see Figure 10 The multi-point oxygen supply mechanism 4 further includes an oxygen inlet pipeline 404, a priority compensation tank 405, a pressure stabilizing tank 406, a primary oxygen supply pressure gauge 407, a secondary oxygen supply pressure gauge 408, and an oxygen supply pipeline outlet 409. The oxygen inlet pipeline 404 is divided into multiple groups, each evenly connected to multiple groups of oxygen inlets 401. The primary oxygen supply pressure gauge 407, the priority compensation tank 405, the secondary oxygen supply pressure gauge 408, the pressure stabilizing tank 406, and the oxygen supply pipeline outlet 409 are sequentially and fixedly connected between the oxygen inlet pipeline 404 and the oxygen inlets 401. The oxygen supply pipeline outlet 409 is fixedly connected to the oxygen inlets 401. In use, oxygen enters through the oxygen inlet pipeline 404 and passes through the primary oxygen supply pressure gauge 406. The oxygen supply pressure gauge 407 enters the priority compensation tank 405, then through the secondary oxygen supply pressure gauge 408 into the pressure stabilizing tank 406, then through the oxygen supply pipeline outlet 409 into the oxygen inlet 401, and finally through the liquid-distributing nozzle 403 on the multi-channel oxygen outlet nozzle 402 into the inner lining layer 113 inside the main tank 102 for oxidation reaction. By setting up the priority compensation tank, pressure stabilizing tank, primary oxygen supply pressure gauge, and secondary oxygen supply pressure gauge, the control accuracy of oxygen supply pressure and flow rate is improved, which not only ensures the efficient oxidation reaction process in the reactor, but also effectively avoids the phenomenon of over-oxygenation reaction and the generation of a large amount of inorganic matter due to unstable control of oxygen supply pressure and flow rate.

[0064] In some embodiments, see Figure 12 , Figure 14The wastewater treatment system based on supercritical water oxidation also includes a tank cleaning mechanism 5, which includes an air inlet 501, a pipe wall cleaning piston 502, a large-diameter chip discharge port 503, a filter box 504, and a filter silicon steel wool 505. An air inlet 501 is fixedly installed on two sets of left and right closed end caps 111 fixedly mounted on both ends of the main tank 102 and connected to an external air compressor. The pipe wall cleaning piston 502 is movably mounted within the inner lining layer 113. The lining layer 113 has a large-diameter chip discharge port 503 located at the main tank drain port 110. A filter box 504 is fixedly installed between the lining layer 503 and the main tank drain port 110, and filter silicon steel wool 505 is fixedly installed inside the filter box 504. By setting the large-diameter chip discharge port, the filter box, and the filter silicon steel wool, the blockage of the inner wall of the pipeline by inorganic particles generated during the waste liquid reaction can be effectively avoided.

[0065] In some embodiments, see Figure 13The pipe wall cleaning piston 502 includes a piston support plate 506, a primary cleaning scraper 507, a chip removal groove 508, a secondary cleaning scraper 509, and a sealing ring 510. The primary cleaning scraper 507 is fixedly sleeved on the piston support plate 506, and multiple sets of evenly spaced chip removal grooves 508 are formed along its outer circumference. The secondary cleaning scraper 509 is fixedly sleeved on the piston support plate 506, and the sealing ring 510 is fixedly sleeved on the piston support plate. On 506, the secondary cleaning scraper 509 is located between the primary cleaning scraper 507 and the sealing ring 510. The pipe wall cleaning piston 502 is movably disposed within the inner liner 113. The primary cleaning scraper 507 is located near the large-diameter chip discharge port 503. In use, when the inner wall of the inner liner 113 needs to be cleaned periodically, the air inlet 501 on the left side is connected to an air compressor. Under the action of air pressure, the pipe wall cleaning piston 502 moves to the right along the inner liner 113. The inner wall of the liner 113 moves linearly. The primary cleaning scraper 507 divides and scrapes the inner liner 113, and the secondary cleaning scraper 509 scrapes the remaining part of the inner liner 113 a second time. The particles are discharged through the chip discharge groove 508 and pushed to the large-diameter chip discharge port 503 to enter the filter box 504 for discharge. After cleaning, the air inlet 501 on the side is connected to the air compressor, and the pipe wall cleaning piston 502 moves to the left along the inner liner under the action of air pressure. 113 The inner wall moves linearly and returns to the initial position; by setting up a tank cleaning mechanism with a primary cleaning scraper, chip removal groove, secondary cleaning scraper and sealing ring, the air supply creates an air pressure difference on both sides of the tank cleaning mechanism, thereby driving it to move linearly along the inner wall of the tank. The primary cleaning scraper has a chip removal groove to divide and dismantle the attached materials on the inner wall. The secondary cleaning scraper scrapes off the remaining material after dismantling, preventing excessive resistance due to the large size of the attached material, and effectively reducing cleaning energy consumption.

[0066] A wastewater treatment process based on supercritical water oxidation includes the following steps:

[0067] S1. Wastewater enters the wastewater inlet pipe 305 after being pressurized by the first-stage pump 302, second-stage pump 303, and third-stage pump 304 through the main water pipe 301. It is then divided into left and right paths by the distribution pipe 306 and enters the inlet 106 through the pipe outlet 310 and then into the auxiliary tank 104.

[0068] S2. Wastewater enters the auxiliary tank 104 through the inlet 106, is heated by the flange heater 201, and then enters the inner lining 113 inside the main tank 102 through the main tank inlet pipe 108. The induction heater 207 heats the wastewater in the inner lining 113 to a specified temperature and then performs an oxidation reaction. After the reaction, the wastewater is discharged through the main tank outlet 110.

[0069] S3. Oxygen enters through the oxygen inlet pipeline 404, then through the first-stage oxygen supply pressure gauge 407 into the priority compensation tank 405, then through the second-stage oxygen supply pressure gauge 408 into the pressure stabilizing tank 406, then through the oxygen supply pipeline outlet 409 into the oxygen inlet 401, and finally through the liquid-distributing nozzle 403 on the multi-channel oxygen outlet nozzle 402 into the inner lining layer 113 inside the main tank 102 for oxidation reaction.

[0070] S4. When the inner wall of the inner lining layer 113 needs to be cleaned regularly, the air inlet 501 on the left side is connected to the air compressor. The pipe wall cleaning piston 502 moves to the right along the inner wall of the inner lining layer 113 under the action of air pressure. The first-stage cleaning scraper 507 divides and scrapes the inner lining layer 113. The second-stage cleaning scraper 509 scrapes the remaining part of the inner lining layer 113 a second time. The particles are discharged through the chip discharge groove 508 and pushed to the large-diameter chip discharge port 503 to enter the filter box 504 for discharge.

[0071] S5. After cleaning, the air inlet 501 on the right side is connected to the air compressor. The pipe wall cleaning piston 502 moves to the left along the inner wall of the inner liner 113 under the action of air pressure and returns to the initial position.

[0072] Obviously, the above embodiments are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, these obvious variations or modifications derived from the spirit of the present invention are still within the scope of protection of the present invention.

Claims

1. A supercritical water oxidation-based wastewater treatment system, characterized by: The application relates to a wastewater treatment tank mechanism (1) which comprises a main tank body base (101), a main tank body (102), a secondary tank base (103), a secondary tank body (104), a heating port (105), a liquid inlet port (106), a secondary tank liquid outlet port (107), a main tank liquid inlet pipe (108), a liquid inlet control valve (109), a main tank liquid outlet port (110), left and right sealing end covers (111), a heat preservation layer (112) and an inner lining layer (113); the main tank body (102) is fixedly arranged on the main tank body base (101), the secondary tank body (104) is fixedly arranged on the main tank body (102) through a plurality of secondary tank bases (103), the liquid inlet port (106) is fixedly arranged on the top of the secondary tank body (104), the heating port (105) is arranged on the side end face of the secondary tank body (104), the secondary tank liquid outlet port (107) is fixedly arranged on the bottom of the secondary tank body (104), a plurality of main tank liquid inlet pipes (108) are fixedly arranged between the main tank body (102) and the secondary tank body (104), the liquid inlet control valve (109) is fixedly arranged on each main tank liquid inlet pipe (108), the main tank liquid outlet port (110) is fixedly arranged on the bottom of the main tank body (102), the left and right sealing end covers (111) are arranged in two groups and are fixedly arranged on the two end faces of the main tank body (102), the heat preservation layer (112) is arranged in the main tank body (102), the inner lining layer (113) is arranged in the heat preservation layer (112), and the wastewater treatment tank mechanism (1) is arranged in two groups and is arranged side by side. A double-stage heating mechanism (2) for heating a reaction environment is fixedly arranged on the wastewater treatment tank mechanism (1); A pressure control mechanism (3) for controlling the pressure of a reaction space is fixedly arranged on the wastewater treatment tank mechanism (1); The double-stage heating mechanism (2) comprises a flange type heater (201) and an inductive heater (207); the flange type heater (201) is fixedly arranged at the heating port (105) on the secondary tank body (104), and the inductive heater (207) is fixedly arranged between the heat preservation layer (112) and the inner lining layer (113) in the main tank body (102). The pressure control mechanism (3) comprises a wastewater main liquid pipe (301), a first-stage pump (302), a second-stage pump (303), a third-stage pump (304), a wastewater inlet liquid pipe (305), a distribution pipe (306), a first-stage pressure gauge (307), a pressure regulating valve (308), a second-stage pressure gauge (309), a pipeline outlet (310), a pressure relief valve (311), a joint pressure relief pipe (312), a pipeline pressure relief port (313), and a control box (314); the first-stage pump (302), the second-stage pump (303), and the third-stage pump (304) are connected to the wastewater main liquid pipe (301) respectively, and the output ends are connected in parallel to the wastewater inlet liquid pipe (305); one end of the wastewater inlet liquid pipe (305) is divided into two paths through the distribution pipe (306); a pressure regulating valve (308) is fixedly arranged on each of the distribution pipes (306); a first-stage pressure gauge (307) and a second-stage pressure gauge (309) are fixedly arranged on the pipelines on the two sides of the pressure regulating valve (308); one end of the pipeline outlet (310) on each of the distribution pipes (306) is connected to the distribution pipe (306), and the other end is fixedly connected to the liquid inlet (106) on the auxiliary tank body (104); A pressure relief valve (311) is fixedly arranged on the front end of the distribution pipe (306) close to the first-stage pressure gauge (307); two groups of pressure relief valves (311) on the two distribution pipes (306) are connected in series through pipelines to the joint pressure relief pipe (312), and a pipeline pressure relief port (313) is fixedly arranged at the tail of the joint pressure relief pipe (312) and connected to a wastewater inlet device; and the control box (314) is fixedly arranged on one side of the wastewater main liquid pipe (301); The wastewater treatment system based on supercritical water oxidation further comprises a multi-point oxygen supply mechanism (4), which comprises an oxygen inlet (401), a multi-channel oxygen outlet nozzle (402), and a distribution spray pipe (403); a plurality of groups of oxygen inlets (401) are uniformly fixedly arranged at the bottom of the main tank body (102); the multi-channel oxygen outlet nozzle (402) is fixedly arranged on the upper side of the oxygen inlet (401) and contacts the inner lining layer (113) and enters the inner surface of the inner lining layer (113) through a plurality of groups of distribution spray pipes (403).

2. The supercritical water oxidation-based wastewater treatment system according to claim 1, wherein The flange-type heater (201) comprises a support flange (202), a straight cylinder (203), a cover (204), a U-shaped heating pipe (205), and a fan-shaped fixed support (206); the support flange (202) is fixedly arranged on the heating port (105); the straight cylinder (203) is fixedly arranged on the side of the support flange (202) away from the heating port (105), and the other side is fixedly provided with the cover (204); a plurality of groups of U-shaped heating pipes (205) are uniformly fixedly arranged on the support flange (202) and are fixed by a plurality of groups of fan-shaped fixed supports (206).

3. The supercritical water oxidation-based wastewater treatment system according to claim 2, wherein The inductive heater (207) is composed of multiple groups of square hard copper pipes (208), each group of the square hard copper pipes (208) is fixedly arranged on the outer wall of the inner lining layer (113) in a spiral shape.

4. The supercritical water oxidation-based wastewater treatment system of claim 1, wherein, The multi-point oxygen supply mechanism (4) further comprises an oxygen inlet pipeline (404), a priority compensation tank (405), a pressure stabilizing tank (406), a primary oxygen supply pressure gauge (407), a secondary oxygen supply pressure gauge (408), and an oxygen supply pipeline outlet (409); the oxygen inlet pipeline (404) is divided into multiple groups and connected to multiple groups of the oxygen inlets (401); the primary oxygen supply pressure gauge (407), the priority compensation tank (405), the secondary oxygen supply pressure gauge (408), the pressure stabilizing tank (406), and the oxygen supply pipeline outlet (409) are sequentially and fixedly connected between the oxygen inlet pipeline (404) and the oxygen inlets (401); and the oxygen supply pipeline outlet (409) is fixedly connected to the oxygen inlets (401).

5. The supercritical water oxidation-based wastewater treatment system of claim 4, wherein, The wastewater treatment system based on supercritical water oxidation further comprises a tank cleaning mechanism (5), which comprises an air inlet (501), a pipe wall cleaning piston (502), a large-diameter chip removal port (503), a filter box (504), and filter silicon steel wool (505); the air inlets (501) are fixedly arranged on the two groups of left and right closed end covers (111) fixedly arranged on the two end faces of the main tank body (102) and connected to external air compressors; the pipe wall cleaning piston (502) is movably arranged in the inner lining layer (113); the large-diameter chip removal port (503) is arranged at the position of the main tank liquid outlet (110) of the inner lining layer (113); the filter box (504) is fixedly arranged between the large-diameter chip removal port (503) and the main tank liquid outlet (110); and the filter silicon steel wool (505) is fixedly arranged in the filter box (504).

6. The supercritical water oxidation-based wastewater treatment system of claim 5, wherein, The pipe wall cleaning piston (502) comprises a piston support disc (506), a primary cleaning scraper (507), a chip removal groove (508), a secondary cleaning scraper (509), and a sealing ring (510); the primary cleaning scraper (507) is fixedly sleeved on the piston support disc (506); a plurality of uniform chip removal grooves (508) are arranged on the outer circumferential surface of the primary cleaning scraper (507); the secondary cleaning scraper (509) is fixedly sleeved on the piston support disc (506); the sealing ring (510) is fixedly sleeved on the piston support disc (506); the secondary cleaning scraper (509) is located between the primary cleaning scraper (507) and the sealing ring (510); the pipe wall cleaning piston (502) is movably arranged in the inner lining layer (113); and the primary cleaning scraper (507) is located close to one side of the large-diameter chip removal port (503).

7. The treatment process of a supercritical water oxidation-based wastewater treatment system according to claim 6, characterized by, The method comprises the following steps: S1, the wastewater through the wastewater main liquid pipe (301), through the first stage pump (302), secondary pump (303), third stage pump (304) hierarchical pressurization into the wastewater inlet pipe (305), through the liquid distribution pipe (306) into two ways after entering the liquid inlet (106) into the vice tank body (104) in turn; S2, the wastewater through the liquid inlet (106) into the vice tank body (104), through the flange heater (201) heating, through the main tank inlet pipe (108) into the inner lining layer (113) in the main tank body (102), the waste liquid in the inner lining layer (113) is heated to the specified temperature by the inductive heater (207) and then oxidized, and the wastewater after reaction is discharged through the main tank liquid outlet (110); S3, oxygen enters through the oxygen inlet pipe (404), enters the priority compensation tank (405) through the oxygen supply first stage pressure gauge (407), enters the pressure stabilizing tank (406) through the oxygen supply second stage pressure gauge (408), and then enters the oxygen inlet (401) through the oxygen supply pipe outlet (409), and finally enters the inner lining layer (113) in the main tank body (102) through the liquid distribution spray pipe (403) on the multi-channel oxygen outlet spray head (402), and performs oxidation reaction; S4, when it is necessary to clean the inner wall of the inner lining layer (113) periodically, the left air inlet (501) is connected to the air compressor, the pipe wall cleaning piston (502) moves linearly along the inner wall of the inner lining layer (113) to the right under the action of air pressure, the first cleaning scraper (507) scrapes the inner lining layer (113), the second cleaning scraper (509) scrapes the remaining part of the inner lining layer (113) twice, and the particles are discharged through the chip removal groove (508) and pushed to the large-diameter chip removal port (503) into the filter box (504) for discharge; S5, after cleaning, the right air inlet (501) is connected to the air compressor, and the pipe wall cleaning piston (502) moves linearly along the inner wall of the inner lining layer (113) to the left under the action of air pressure, and returns to the initial position.

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