Wastewater treatment system and process based on supercritical water oxidation

Abstract

The wastewater treatment system comprises a wastewater treatment tank mechanism, and the wastewater treatment tank mechanism comprises a main tank body base, a main tank body, an auxiliary tank base, an auxiliary tank body, a heating opening, a liquid inlet, an auxiliary tank liquid outlet, a main tank liquid inlet pipe, a liquid inlet control valve, a main tank liquid outlet, a left sealing end cover, a right sealing end cover, a heat preservation layer and a lining layer. The main tank body is fixedly arranged on the main tank body base, the auxiliary tank bodies are fixedly arranged on the main tank body through the multiple sets of auxiliary tank bases, a liquid inlet is fixedly formed in the top of each auxiliary tank body, and a heating opening is formed in the end face of one side of each auxiliary tank body. The whole tank body is optimized for anti-corrosion treatment, so that the production cost of equipment is reduced; the corrosion to the inner wall of the tank body in a wastewater preheating link is improved. The pressure control precision is improved, the oxygen inlet mode is improved, and the phenomenon that the tank body and the pipeline are blocked due to the fact that inorganic salt settles or is attached to the pipe wall due to the long reaction period is reduced.

Description

Technical Field

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

[0002] Supercritical water oxidation is an advanced waste treatment technology, especially suitable for treating wastewater and solid waste containing high concentrations of organic matter or toxic and hazardous substances. The 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 physical and chemical properties of water change significantly, including increased density, decreased viscosity, increased diffusion coefficient, and decreased dielectric constant, which allows many organic matter and oxygen that are originally insoluble or poorly soluble in water to be highly soluble 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 contacted with oxygen (or other oxidants) in a reactor and reacted under high temperature and pressure. Under these conditions, organic matter rapidly undergoes oxidation reaction with oxygen and decomposes 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 high-valent salts, and heavy metals are oxidized and stably solidified in the ash.

[0004] This technology has the characteristics of fast reaction speed, high oxidation efficiency, and harmless products. It is very effective in treating wastewater containing complex organic components and difficult to treat with conventional methods. However, due to its harsh operating conditions, high requirements for equipment and materials, and possible problems such as corrosion and scaling, it also faces certain technical and economic challenges in practical applications. Despite this, supercritical water oxidation technology is still considered to be one of the most promising advanced oxidation technologies and has broad application prospects in the field of environmental protection.

[0005] Under supercritical conditions, organic pollutants can be fully mixed with water and oxygen to achieve efficient oxidation reactions. Even complex organic matter can be almost completely oxidized into non-toxic small molecules such as carbon dioxide, water, nitrogen and harmless salts in a relatively short period of time. Thorough treatment: The removal rate of toxic substances is extremely high, usually reaching more than 99.99%, which greatly reduces the harmful components in the final emissions and meets strict environmental protection standards. Because the reaction is carried out in a homogeneous environment at high temperature and pressure, the reaction rate is greatly improved and the residence time is extremely short, usually between a few seconds and a few minutes, which is conducive to reducing the volume and cost of the reactor. It is suitable for treating various types of toxic and hazardous wastes and wastewaters, including but not limited to difficult-to-degrade organic matter, medical waste, chemical wastewater, petroleum refining by-products, pesticide residues, etc.

[0006] The specific working steps are as follows: Pretreatment: First, the wastewater is properly pretreated to remove large particle impurities and substances that may cause damage to the equipment. At the same time, the organic matter may be concentrated to improve the treatment efficiency. Pressurization and heating: The wastewater is pressurized to the pressure range of supercritical water by a high-pressure pump and heated to above the temperature of supercritical water by a heater. Dissolution and reaction: In the supercritical state, the solubility of water is greatly enhanced, and it can dissolve most organic matter and oxygen to form a homogeneous oxidation environment. At this time, the organic matter and the dissolved oxygen undergo a rapid oxidation reaction to produce carbon dioxide, water and harmless salts. Oxidation reaction: Organic matter is rapidly oxidized and decomposed in the presence of high temperature, high pressure and oxygen, completing the breaking and reorganization of chemical bonds to form small molecular harmless products. Product separation: The supercritical water after the reaction is cooled and depressurized, so that the oxidation products are converted back into gas, liquid or solid, and then separated from the water phase by 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 converted into other forms of energy for use.

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

[0008] As application number 202210129253.3 provides a supercritical water oxidation system, which relates 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 is provided with 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, the sludge fluid outlet and the tail gas outlet are both connected to the pretreatment chamber, and the heat exchanger is used to realize heat exchange between sludge fluid and tail gas. The supercritical water oxidation system provided by the present invention reduces the amount of 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, most of the current supercritical wastewater treatment systems have high heating energy consumption, and the anti-corrosion treatment of the entire tank body leads to high equipment production costs; the wastewater preheating process causes serious corrosion to the inner wall of the tank. The pressure control accuracy is not high, resulting in unstable pressure control of the reaction environment; the oxygen intake method is simple, the waste liquid is not in uniform contact with oxygen, the oxidation rate is low, the oxidation reaction speed is slow, and the reaction cycle is long. Due to the long reaction cycle, inorganic salts settle or adhere to the pipe wall, blocking the tank body and pipeline; the control accuracy of the oxygen intake pressure and flow is not high, and the unstable control of the oxygen intake pressure and flow leads to over-oxygen reaction, resulting in the production of a large amount of inorganic substances. Summary of the invention

[0010] The technical problem to be solved by the present invention is to reduce heating energy consumption, optimize the anti-corrosion treatment of the tank as a whole, and reduce the production cost of the equipment; improve the corrosion of the inner wall of the tank during the wastewater preheating process. Improve the pressure control accuracy and the stability of the pressure control of the reaction environment; improve the oxygen intake method, improve the uniformity of contact between the waste liquid and oxygen, increase the oxidation rate, increase the oxidation reaction speed, reduce the reaction cycle, and reduce the phenomenon of inorganic salts settling or adhering to the pipe wall and blocking the tank and pipeline due to the long reaction cycle; improve the control accuracy of the oxygen intake pressure and flow rate, and improve the phenomenon of over-oxygen reaction and the generation of a large amount of inorganic substances due to the unstable control of the oxygen intake pressure and flow rate.

[0011] In order to solve the above technical problems, the present invention provides a wastewater treatment system based on supercritical water oxidation, including a wastewater treatment tank mechanism, wherein the wastewater treatment tank mechanism includes a main tank body base, a main tank body, a sub-tank base, a sub-tank body, a heating port, a liquid inlet, a sub-tank discharge port, a main tank liquid inlet pipe, a liquid inlet control valve, a main tank discharge port, left and right closed end covers, a thermal insulation layer, and an inner lining layer; the main tank body is fixedly arranged on the main tank body base, the sub-tank body is fixedly arranged on the main tank body through multiple groups of the sub-tank bases, and the top of the sub-tank body is fixedly provided with a liquid inlet, so that A heating port is provided on one end surface of the auxiliary tank body, a auxiliary tank drain port is fixedly provided at the middle position of the bottom of the auxiliary tank body, a plurality of groups of main tank liquid inlet pipes are fixedly provided between the main tank body and the auxiliary tank body, and a liquid inlet control valve is fixedly provided on each group of the main tank liquid inlet pipes, a main tank drain port is fixedly provided on one side of the bottom of the main tank body, two groups of left and right closed end covers are provided, which are respectively fixedly provided on the two end surfaces of the main tank body, an insulation layer is provided inside the main tank body, and an inner lining layer is provided inside the insulation layer, and two groups of wastewater treatment tank mechanisms are provided, which are arranged side by side; A two-stage heating mechanism for heating the reaction environment is fixedly arranged on the wastewater treatment tank mechanism; A pressure control mechanism for controlling the pressure of the reaction space is fixedly arranged on the wastewater treatment tank mechanism.

[0012] Preferably, the two-stage heating mechanism comprises a flange heater and an induction heater; the flange heater is fixedly arranged at the heating port on the auxiliary tank body, and the induction heater is fixedly arranged between the insulation layer and the lining layer in the main tank body; Preferably, the flange-type heater comprises a supporting flange, a straight tube, a cover, a U-shaped heating tube, and a fan-shaped fixing bracket; the supporting flange is fixedly arranged on the heating port, the straight tube is fixedly arranged on one side of the supporting flange away from the heating port, and the cover is fixedly arranged on the other side; the U-shaped heating tube is provided with multiple groups, evenly fixedly arranged on the supporting flange, and fixed by multiple groups of the fan-shaped fixing brackets; Preferably, the induction heater is composed of a plurality of groups of square hard copper tubes, and each group of square hard copper tubes is evenly and fixedly arranged on the outer wall of the inner lining layer in a spiral shape; Preferably, the pressure control mechanism includes a wastewater main liquid pipe, a primary pump, a secondary pump, a tertiary pump, a wastewater inlet pipe, a liquid distributor, a primary pressure gauge, a pressure regulating valve, a secondary pressure gauge, a pipeline outlet, a pressure relief valve, a connecting pressure relief pipe, a pipeline pressure relief port, and a control box; the primary pump, the secondary pump, and the tertiary pump are respectively connected to the wastewater main liquid pipe, and the output ends are connected in parallel to the wastewater inlet pipe. One end of the wastewater inlet pipe is divided into left and right paths through the liquid distributor, and a pressure regulating valve is fixedly provided on each liquid distributor, and the pressure regulating valve is fixed on the pressure regulating valve. A primary pressure gauge and a secondary pressure gauge are fixedly arranged on the pipelines on both sides. One end of the pipeline outlet on each group of the liquid dispensing pipes is connected to the liquid dispensing pipe, and the other end is fixedly connected to the liquid inlet on the auxiliary tank body; a pressure relief valve is fixedly arranged on the liquid dispensing pipe near the front end of the primary pressure gauge, and the two groups of the pressure relief valves on the two liquid dispensing pipes are connected in series to the combined pressure relief pipe through pipelines, and a pipeline pressure relief port is fixedly arranged at the tail thereof to be connected to the wastewater inlet equipment, and the control box is fixedly arranged on one side of the wastewater main liquid pipe; Preferably, the wastewater treatment system based on supercritical water oxidation further comprises a multi-point oxygen supply mechanism, which comprises an oxygen inlet, a multi-channel oxygen outlet nozzle, and a liquid separation nozzle; the oxygen inlet is provided with multiple groups, which are respectively and evenly fixedly arranged at the bottom of the main tank body, the multi-channel oxygen outlet nozzle is fixedly arranged on the upper side of the oxygen inlet, contacts the inner lining layer, and is provided with multiple groups of liquid separation nozzles to enter the inner surface of the inner lining layer and be tangent; Preferably, the multi-point oxygen supply mechanism further comprises an oxygen supply 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 supply pipeline is divided into multiple groups, which are 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 fixedly connected between the oxygen supply pipeline and the oxygen inlet, and the oxygen supply pipeline outlet is fixedly connected to the oxygen inlet; Preferably, the wastewater treatment system based on supercritical water oxidation also includes a tank cleaning mechanism, which includes an air inlet, a pipe wall cleaning piston, a large-diameter chip removal port, a filter box, and filter silicon steel wool; the two groups of left and right closed end covers fixedly arranged on the two end surfaces of the main tank body are respectively fixedly provided with air inlets and connected to the outer air compressor, the pipe wall cleaning piston is movably arranged in the inner lining layer, the lining layer is provided with a large-diameter chip removal port at the position of the main tank discharge port, a filter box is fixedly arranged between the filter box and the main tank discharge port, and filter silicon steel wool is fixedly arranged in the filter box; Preferably, the pipe wall cleaning piston comprises a piston support plate, a primary cleaning scraper, a chip removal groove, a secondary cleaning scraper, and a sealing ring; the primary cleaning scraper is fixedly sleeved on the piston support plate, and a plurality of uniform chip removal grooves are provided on the primary cleaning scraper along its outer circumferential surface, the secondary cleaning scraper is fixedly sleeved on the piston support plate, and 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 arranged in the inner lining layer, and the primary cleaning scraper is close to the side of the large-diameter chip removal port; A treatment process of a wastewater treatment system based on supercritical water oxidation comprises the following steps: S1, wastewater passes through the main water pipe, is pressurized by the primary pump, the secondary pump, and the tertiary pump, and then enters the wastewater inlet pipe. After being divided into two left and right paths by the liquid separation pipe, the wastewater enters the liquid inlet through the pipe outlet and then enters the auxiliary tank body; S2, wastewater enters the auxiliary tank through the liquid inlet, is heated by the flange heater, and then enters the inner lining layer in the main tank through the main tank liquid inlet pipe. The induction heater heats the waste liquid in the inner lining layer to a specified temperature and then performs an oxidation reaction. After the reaction, the wastewater is discharged through the main tank liquid discharge port; S3, oxygen enters through the oxygen inlet pipeline, enters the priority compensation tank through the oxygen supply primary pressure gauge, then enters the pressure regulating tank through the oxygen supply secondary pressure gauge, and then enters the oxygen inlet through the oxygen supply pipeline outlet, and finally enters the inner lining layer in the main tank body through the liquid separation nozzle on the multi-channel oxygen outlet nozzle to perform an oxidation reaction; S4. When it is necessary to regularly clean the inner wall of the lining layer, the air inlet on the left is connected to an air compressor, and the pipe wall cleaning piston moves linearly to the right along the inner wall of the lining layer under the action of air pressure, and the first-level cleaning scraper performs segmented scraping on the lining layer, and the second-level cleaning scraper performs secondary scraping on the remaining part of the lining layer, and 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; S5. After cleaning, the air inlet on the right is connected to the air compressor, and the pipe wall cleaning piston moves linearly to the left along the inner wall of the lining layer under the action of air pressure and returns to the initial position; Compared with the prior art, the present invention has the following beneficial effects: 1. By setting up the insulation layer, the outward dissipation of the temperature in the cavity is effectively reduced, which is beneficial to reducing the heating energy consumption and providing a guarantee for the secondary recovery of the liquid after high-temperature and high-pressure oxidation. By setting up the inner lining layer, only the inner lining layer needs to be treated with anti-corrosion materials, avoiding the treatment of the entire tank body, reducing production costs and resource waste.

[0013] 2. By setting up a two-stage heating mechanism and eliminating the preheating step, the wastewater is quickly heated when it enters the auxiliary tank and enters the main tank at the same time. After entering the main tank, it continues to be quickly heated to the set temperature. By improving the heating method, the corrosion of the tank inner wall caused by the wastewater preheating step is effectively reduced.

[0014] 3. By setting up multiple groups of square hard copper tube induction heaters, the heat conduction rate is greatly improved, the heating efficiency is improved, the heating time is reduced, the reaction cycle is reduced, the degradation efficiency is improved, and the corrosion of the wastewater to the tube wall during the heating process is reduced.

[0015] 4. By setting up a first-stage pump, a second-stage pump, and a third-stage pump, the set pressure value is reached by adopting a step-by-step pressurization method, thereby reducing equipment energy consumption. When the pressure pump is damaged, it is easy to replace and the maintenance cost is low.

[0016] 5. By setting up a primary pressure gauge, a pressure regulating valve, and a secondary pressure gauge, the valve control position of the pipeline pressure is measured bidirectionally to improve the pressure control accuracy and the stability of the reaction environment pressure control.

[0017] 6. By setting up a multi-point oxygen supply mechanism, oxygen enters the reaction chamber through multi-component liquid nozzles on multiple groups 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 the precipitation or adhesion of inorganic salts to the tube wall due to the long reaction cycle.

[0018] 7. By setting up a priority compensation tank, a pressure-stabilizing tank, a first-level oxygen supply pressure gauge, and a second-level oxygen supply pressure gauge, the control accuracy of the oxygen intake pressure and flow rate is improved, which not only ensures an efficient oxidation reaction process in the reactor, but also effectively avoids the over-oxygen reaction caused by unstable control of the oxygen intake pressure and flow rate, resulting in the production of a large amount of inorganic matter.

[0019] 8. A tank cleaning mechanism with a primary cleaning scraper, a chip removal groove, a secondary cleaning scraper, and a sealing ring is provided, and air is added to cause 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. A chip removal groove is provided on the primary cleaning scraper to divide and disassemble the attachments on the inner wall, and the secondary cleaning scraper scrapes the residue after disassembly as a whole to prevent excessive resistance due to excessive attachments as a whole, thereby effectively reducing cleaning energy consumption.

[0020] 9. By setting up a large-diameter chip discharge port, a filter box, and filtering 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention is further described in detail below in conjunction with the accompanying drawings: Figure 1 It is a right side view of the present invention; Figure 2 It is the front view of the present invention; Figure 3 A top view of the present invention; Figure 4 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 5 for Figure 1 Schematic diagram of the structure of the cross section in the AA direction; Figure 6 for Figure 5 A partial enlarged schematic diagram of the middle B area; Figure 7 for Figure 5 A partial enlarged schematic diagram of the middle C area; Figure 8 for Figure 3 A partial enlarged schematic diagram of the middle D area; Fig. 9 for Figure 4 A partial enlarged schematic diagram of the middle E area; Fig.10 for Figure 3 A partial enlarged schematic diagram of the middle F area; Fig.11 for Figure 5 A partial enlarged schematic diagram of the middle G area; Fig.12 for Figure 5 A partial enlarged schematic diagram of the middle H region; Fig.13 This is a front view of the pipe wall cleaning piston of the present invention; Fig.14 for Figure 5 A partial enlarged schematic diagram of the middle J region; In the figure: 1. Wastewater treatment tank mechanism; 101. Main tank base; 102. Main tank; 103. Sub-tank base; 104. Sub-tank; 105. Heating port; 106. Liquid inlet; 107. Sub-tank drain port; 108. Main tank liquid inlet pipe; 109. Liquid inlet control valve; 110. Main tank drain port; 111. Left and right closed end covers; 112. Insulation layer; 113. Lining layer; 2. Double-stage heating mechanism ; 201, flange heater; 202, support flange; 203, straight tube; 204, cover; 205, U-shaped heating tube; 206, fan-shaped fixing bracket; 207, induction heater; 208, square hard copper tube; 3, pressure control mechanism; 301, wastewater main liquid pipe; 302, primary pump; 303, secondary pump; 304, tertiary pump; 305, wastewater inlet pipe; 306, liquid distribution pipe; 307, primary pressure gauge; 308, pressure regulating valve; 309, secondary pressure gauge; 310, pipeline outlet; 311, pressure relief valve; 312, Huilian 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 separation nozzle; 404, oxygen inlet pipeline; 405, priority compensation tank; 406, pressure stabilizing tank; 4 07. Oxygen supply first-level pressure gauge; 408. Oxygen supply second-level pressure gauge; 409. Oxygen supply pipeline outlet; 5. Tank cleaning mechanism; 501. Air inlet; 502. Pipe wall cleaning piston; 503. Large-diameter chip removal port; 504. Filter box; 505. Filter silicon steel wool; 506. Piston support plate; 507. First-level cleaning scraper; 508. Chip removal groove; 509. Second-level cleaning scraper; 510. Sealing ring; DETAILED DESCRIPTION Example 1

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] See also Figure 1-Figure 14A wastewater treatment system based on supercritical water oxidation, comprising a wastewater treatment tank mechanism 1, wherein the wastewater treatment tank mechanism 1 comprises a main tank body base 101, a main tank body 102, a sub-tank base 103, a sub-tank body 104, a heating port 105, a liquid inlet 106, a sub-tank liquid discharge port 107, a main tank liquid inlet pipe 108, a liquid inlet control valve 109, a main tank liquid discharge port 110, left and right closed end covers 111, a thermal insulation layer 112, and an inner lining layer 113; the main tank body 102 is fixedly arranged on the main tank body base 101, the sub-tank body 104 is fixedly arranged on the main tank body 102 through multiple groups of the sub-tank bases 103, the top of the sub-tank body 104 is fixedly provided with a liquid inlet 106, a heating port 105 is opened on one side end surface of the sub-tank body 104, a sub-tank liquid discharge port 107 is fixedly arranged at the middle position of the bottom of the sub-tank body 104, and the main tank body 1 02 and the auxiliary tank body 104, a plurality of groups of main tank liquid inlet pipes 108 are fixedly arranged, each group of the main tank liquid inlet pipes 108 is fixedly arranged with a liquid inlet control valve 109, a main tank liquid discharge port 110 is fixedly arranged on one side of the bottom of the main tank body 102, two groups of left and right closed end covers 111 are arranged, which are respectively fixedly arranged on the two end surfaces of the main tank body 102, an insulation layer 112 is arranged inside the main tank body 102, and an inner lining layer 113 is arranged inside the insulation layer 112, and two groups of the wastewater treatment tank mechanism 1 are arranged side by side; by setting the insulation layer, the outward dissipation of the temperature in the cavity is effectively reduced, which is beneficial to reducing the heating energy consumption, and provides a guarantee for the secondary recovery of the liquid after high-temperature and high-pressure oxidation, and by setting the inner lining layer, only the inner lining layer needs to be treated with anti-corrosion materials, thus avoiding the treatment of the tank body as a whole, reducing the production cost and waste of resources.

[0024] The wastewater treatment tank mechanism 1 is fixedly provided with a two-stage heating mechanism 2 for heating the reaction environment; The wastewater treatment tank mechanism 1 is fixedly provided with a pressure control mechanism 3 for controlling the pressure of the reaction space.

[0025] In some embodiments, see Figure 5The two-stage heating mechanism 2 includes a flange heater 201 and an induction heater 207; the flange heater 201 is fixedly arranged at the heating port 105 on the auxiliary tank body 104, and the induction heater 207 is fixedly arranged between the insulation layer 112 and the inner lining layer 113 in the main tank body 102; when in use, the wastewater enters the auxiliary tank body 104 through the liquid inlet 106, and after being heated by the flange heater 201, it enters the inner lining layer 113 in the main tank body 102 through the main tank liquid inlet pipe 108, and the induction heater 207 heats the waste liquid in the inner lining layer 113 to a specified temperature and then performs an oxidation reaction, and the wastewater after the reaction is discharged through the main tank discharge port 110; by setting up a two-stage heating mechanism, the preheating link is cancelled, and the wastewater enters the auxiliary tank and is quickly heated while entering the main tank, and continues to be quickly heated to the set temperature after entering the main tank. By improving the heating method, the corrosion of the wastewater preheating link on the inner wall of the tank body is effectively reduced.

[0026] In some embodiments, see Figure 6 The flange heater 201 includes a support flange 202, a straight tube 203, a cover 204, a U-shaped heating tube 205, and a fan-shaped fixing bracket 206; the support flange 202 is fixedly arranged on the heating port 105, the straight tube 203 is fixedly arranged on one side of the support flange 202 away from the heating port 105, and the cover 204 is fixedly arranged on the other side, and the U-shaped heating tube 205 is provided with multiple groups, which are evenly fixed on the support flange 202 and fixed by multiple groups of the fan-shaped fixing brackets 206; In some embodiments, see Figure 7 The induction heater 207 is composed of a plurality of groups of square hard copper tubes 208, and each group of the square hard copper tubes 208 is spirally and evenly fixedly arranged on the outer wall of the inner lining layer 113; by setting up an induction heater with a plurality of groups of square hard copper tubes, the heat conduction rate is greatly improved, the heating efficiency is improved, the heating time is reduced, the reaction cycle is shortened, and the degradation efficiency is improved, while the corrosion of the wastewater to the tube wall during the heating process is reduced.

[0027] In some embodiments, see Figure 8-9The pressure control mechanism 3 includes a wastewater main liquid pipe 301, a primary pump 302, a secondary pump 303, a tertiary pump 304, a wastewater inlet pipe 305, a liquid distribution pipe 306, a primary pressure gauge 307, a pressure regulating valve 308, a secondary 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 primary pump 302, the secondary pump 303, and the tertiary pump 304 are respectively connected to the wastewater main liquid pipe 301 The output end is connected in parallel to the wastewater inlet pipe 305, one end of the wastewater inlet pipe 305 is divided into two left and right paths through the liquid distributor 306, each of the liquid distributors 306 is fixedly provided with a pressure regulating valve 308, and a primary pressure gauge 307 and a secondary pressure gauge 309 are fixedly provided on the pipelines on both sides of the pressure regulating valve 308, one end of the pipeline outlet 310 on each group of the liquid distributors 306 is connected to the liquid distributor 306, and the other end is connected to the auxiliary tank 1 04 is fixedly connected to the liquid inlet 106; the liquid dispensing pipe 306 is fixedly provided with a pressure relief valve 311 near the front end of the primary pressure gauge 307, and the two groups of pressure relief valves 311 on the two liquid dispensing pipes 306 are connected in series to the connecting pressure relief pipe 312 through pipelines, and a pipeline pressure relief port 313 is fixedly provided at the tail thereof to connect to the wastewater inlet equipment, and the control box 314 is fixedly provided on one side of the wastewater main liquid pipe 301; when in use, the wastewater passes through the water main liquid Pipe 301, after being pressurized by the first-stage pump 302, the second-stage pump 303, and the third-stage pump 304, enters the wastewater inlet pipe 305, and is divided into two left and right paths by the liquid distributor 306, and then enters the liquid inlet 106 through the pipeline outlet 310 and then enters the auxiliary tank 104; by setting a first-stage pump, a second-stage pump, and a third-stage pump, a step-by-step pressurization method is adopted to reach the set pressure value, reduce equipment energy consumption, and when the pressure pump is damaged, it is easy to replace, and the maintenance cost is low. By setting a first-stage pressure gauge, a pressure regulating valve, and a second-stage pressure gauge, the valve control position of the pipeline pressure is measured bidirectionally, the pressure control accuracy is improved, and the stability of the reaction environment pressure control is improved.

[0028] In some embodiments, see Fig.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 separation nozzle 403; the oxygen inlet 401 is provided with multiple groups, which are evenly fixedly arranged at the bottom of the main tank body 102, and the multi-channel oxygen outlet nozzle 402 is fixedly arranged on the upper side of the oxygen inlet 401, contacts the inner lining layer 113, and enters the inner surface of the inner lining layer 113 through a multi-component liquid nozzle 403; by setting the multi-point oxygen supply mechanism, oxygen enters the reaction chamber through the multi-component liquid nozzles on the multiple groups of multi-channel oxygen outlet nozzles, thereby improving the uniformity of contact between the waste liquid and oxygen, fully improving the oxidation rate, improving the oxidation reaction speed, and reducing the reaction cycle, while effectively avoiding the precipitation or adhesion of inorganic salts to the pipe wall due to a long reaction cycle.

[0029] In some embodiments, see Fig.10 The multi-point oxygen supply mechanism 4 also includes an oxygen supply pipeline 404, a priority compensation tank 405, a pressure-stabilizing tank 406, an oxygen supply primary pressure gauge 407, an oxygen supply secondary pressure gauge 408, and an oxygen supply pipeline outlet 409; the oxygen supply pipeline 404 is divided into multiple groups, which are evenly connected to multiple groups of oxygen inlets 401, and the oxygen supply pipeline 404 and the oxygen inlet 401 are sequentially fixedly connected with an oxygen supply primary pressure gauge 407, a priority compensation tank 405, an oxygen supply secondary pressure gauge 408, a pressure-stabilizing tank 406, and an oxygen supply pipeline outlet 409, and the oxygen supply pipeline outlet 409 is fixedly connected to the oxygen inlet 401; when in use, oxygen enters through the oxygen supply pipeline 404, and passes through the oxygen supply primary pressure gauge 408. The oxygen gas enters the priority compensation tank 405 through the pressure gauge 407, and then enters the pressure regulating tank 406 through the oxygen supply secondary pressure gauge 408, and then enters the oxygen inlet 401 through the oxygen supply pipeline outlet 409, and finally enters the inner lining 113 in the main tank body 102 through the liquid separation nozzle 403 on the multi-channel oxygen outlet nozzle 402 to carry out oxidation reaction; by arranging the priority compensation tank, the pressure regulating tank, the oxygen supply primary pressure gauge, and the oxygen supply secondary pressure gauge, the control accuracy of the oxygen intake pressure and flow is improved, which not only ensures the efficient oxidation reaction process in the reactor, but also effectively avoids the phenomenon of over-oxygen reaction and the generation of a large amount of inorganic substances due to unstable control of the oxygen intake pressure and flow.

[0030] In some embodiments, see Fig.12 , Fig.14The wastewater treatment system based on supercritical water oxidation also includes a tank cleaning mechanism 5, which includes an air inlet 501, a tube wall cleaning piston 502, a large-diameter chip removal port 503, a filter box 504, and a filter silicon steel wool 505; the two groups of left and right closed end covers 111 fixedly arranged on the two end surfaces of the main tank body 102 are respectively fixedly provided with an air inlet 501, and are connected to the outer air compressor, the tube wall cleaning piston 502 is movably arranged in the inner lining 113, and the lining 113 is provided with a large-diameter chip removal port 503 at the position of the main tank discharge port 110, and a filter box 504 is fixedly arranged between the large-diameter chip removal port 503 and the main tank discharge port 110, and the filter silicon steel wool 505 is fixedly arranged in the filter box 504; by arranging the large-diameter chip removal port, the filter box, and the filter silicon steel wool, it can effectively prevent the inorganic particulate matter generated during the waste liquid reaction from clogging the inner wall of the pipeline.

[0031] In some embodiments, see Fig.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 a plurality of uniform chip removal grooves 508 are provided on the primary cleaning scraper 507 along its outer circumferential surface. 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 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 close to the side of the large-diameter chip removal port 503; when in use, when it is necessary to regularly clean the inner wall of the inner lining layer 113, the air inlet 501 on the left is connected to the air compressor, and the pipe wall cleaning piston 502 moves to the right along the inner lining layer 113 under the action of air pressure. The inner wall of the lining layer 113 moves linearly, the first-level cleaning scraper 507 divides and scrapes the inner lining layer 113, and the second-level cleaning scraper 509 scrapes the remaining part of the inner lining layer 113 for a second time, and 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 lining 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, a chip removal groove, a secondary cleaning scraper and a sealing ring, air is added to cause 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 is provided with a chip removal groove to divide and disassemble the attachments on the inner wall, and the secondary cleaning scraper scrapes the residue after disassembly as a whole to prevent excessive resistance due to the overall size of the attachments, thereby effectively reducing the cleaning energy consumption.

[0032] A treatment process of a wastewater treatment system based on supercritical water oxidation comprises the following steps: S1, wastewater passes through the main water pipe 301, and after being pressurized by the primary pump 302, the secondary pump 303, and the tertiary pump 304, enters the wastewater inlet pipe 305, and is divided into left and right paths by the liquid separation pipe 306, and then enters the liquid inlet 106 through the pipeline outlet 310 and then enters the auxiliary tank 104; S2, wastewater enters the auxiliary tank body 104 through the liquid inlet 106, is heated by the flange heater 201, and then enters the inner lining layer 113 in the main tank body 102 through the main tank liquid inlet pipe 108, the induction heater 207 heats the waste liquid in the inner lining layer 113 to a specified temperature and then performs an oxidation reaction, and the wastewater after the reaction is discharged through the main tank liquid discharge port 110; S3, oxygen enters through the oxygen inlet pipeline 404, enters the priority compensation tank 405 through the oxygen supply primary pressure gauge 407, and then enters the pressure regulating tank 406 through the oxygen supply secondary pressure gauge 408, and then enters the oxygen inlet 401 through the oxygen supply pipeline outlet 409, and finally enters the inner lining layer 113 in the main tank body 102 through the liquid separation nozzle 403 on the multi-channel oxygen outlet nozzle 402 to perform an oxidation reaction; S4. When it is necessary to regularly clean the inner wall of the inner lining layer 113, the air inlet 501 on the left is connected to an air compressor, and the pipe wall cleaning piston 502 moves linearly to the right along the inner wall of the inner lining layer 113 under the action of air pressure, and the first-level cleaning scraper 507 performs segmented scraping on the inner lining layer 113, and the second-level cleaning scraper 509 performs secondary scraping on the remaining part of the inner lining layer 113, and 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; S5. After cleaning, the air inlet 501 on the right is connected to the air compressor, and the pipe wall cleaning piston 502 moves linearly to the left along the inner wall of the lining layer 113 under the action of air pressure and returns to the initial position; Obviously, the above embodiments are merely examples for clearly explaining the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. However, these obvious changes or modifications derived from the spirit of the present invention are still within the protection scope of the present invention.

Claims

1. A wastewater treatment system based on supercritical water oxidation, characterized in that: The wastewater treatment tank mechanism (1) comprises a main tank body base (101), a main tank body (102), a sub-tank base (103), a sub-tank body (104), a heating port (105), a liquid inlet (106), a sub-tank liquid discharge port (107), a main tank liquid inlet pipe (108), a liquid inlet control valve (109), a main tank liquid discharge port (110), left and right closed end covers (111), a thermal insulation layer (112), and an inner lining layer (113); the main tank body (102) is fixedly arranged on the main tank body base (101), the sub-tank body (104) is fixedly arranged on the main tank body (102) via a plurality of sub-tank bases (103), the top of the sub-tank body (104) is fixedly provided with a liquid inlet (106), and the sub-tank body (104) is provided with a plurality of sub-tank bases (103). 4) A heating port (105) is provided on one end surface; a secondary tank liquid discharge port (107) is fixedly provided at the middle position of the bottom of the secondary tank body (104); a plurality of groups of main tank liquid inlet pipes (108) are fixedly provided between the main tank body (102) and the secondary tank body (104); a liquid inlet control valve (109) is fixedly provided on each group of the main tank liquid inlet pipes (108); a main tank liquid discharge port (110) is fixedly provided on one side of the bottom of the main tank body (102); two groups of left and right closed end covers (111) are provided, which are respectively fixedly provided on the two end surfaces of the main tank body (102); a heat-insulating layer (112) is provided inside the main tank body (102); an inner lining layer (113) is provided inside the heat-insulating layer (112); and two groups of the wastewater treatment tank mechanism (1) are provided, which are arranged side by side; A two-stage heating mechanism (2) for heating the reaction environment is fixedly arranged on the wastewater treatment tank mechanism (1); A pressure control mechanism (3) for controlling the pressure of the reaction space is fixedly arranged on the wastewater treatment tank mechanism (1).

2. A wastewater treatment system based on supercritical water oxidation according to claim 1, characterized in that: The two-stage heating mechanism (2) comprises a flange heater (201) and an induction heater (207); the flange heater (201) is fixedly arranged at the heating port (105) on the auxiliary tank body (104), and the induction heater (207) is fixedly arranged between the thermal insulation layer (112) and the inner lining layer (113) in the main tank body (102).

3. A wastewater treatment system based on supercritical water oxidation according to claim 2, characterized in that: The flange-type heater (201) comprises a supporting flange (202), a straight tube (203), a cover (204), a U-shaped heating tube (205), and a fan-shaped fixing bracket (206); the supporting flange (202) is fixedly arranged on the heating port (105), the straight tube (203) is fixedly arranged on one side of the supporting flange (202) away from the heating port (105), and the cover (204) is fixedly arranged on the other side; a plurality of groups of U-shaped heating tubes (205) are arranged, which are evenly fixedly arranged on the supporting flange (202) and fixed by a plurality of groups of fan-shaped fixing brackets (206).

4. A wastewater treatment system based on supercritical water oxidation according to claim 3, characterized in that: The induction heater (207) is composed of a plurality of groups of square hard copper tubes (208), and each group of the square hard copper tubes (208) is evenly spaced and fixedly arranged on the outer wall of the inner lining layer (113) in a spiral shape.

5. A wastewater treatment system based on supercritical water oxidation according to claim 4, characterized in that: The pressure control mechanism (3) comprises a wastewater main liquid pipe (301), a primary pump (302), a secondary pump (303), a tertiary pump (304), a wastewater inlet pipe (305), a liquid separator (306), a primary pressure gauge (307), a pressure regulating valve (308), a secondary pressure gauge (309), a pipeline outlet (310), a pressure relief valve (311), a connecting pressure relief pipe (312), a pipeline 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 wastewater main liquid pipe (301), and their output ends are connected in parallel to the wastewater inlet pipe (305); one end of the wastewater inlet pipe (305) is divided into left and right paths through the liquid separator (306), and a regulating valve is fixedly provided on each liquid separator (306). A pressure regulating valve (308) is provided, and a first-level pressure gauge (307) and a second-level pressure gauge (309) are fixedly provided on the pipelines on both sides of the pressure regulating valve (308); one end of the pipeline outlet (310) on each group of the liquid distributing pipes (306) is connected to the liquid distributing 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 provided on the liquid distributing pipe (306) near the front end of the first-level pressure gauge (307); the two groups of the pressure relief valves (311) on the two liquid distributing pipes (306) are connected in series to the combined pressure relief pipe (312) through pipelines, and a pipeline pressure relief port (313) is fixedly provided at the tail end thereof to be connected to the wastewater inlet equipment; the control box (314) is fixedly provided on one side of the wastewater main liquid pipe (301).

6. A wastewater treatment system based on supercritical water oxidation according to claim 5, characterized in that: The 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 separation nozzle (403); the oxygen inlet (401) is provided with a plurality of groups, which are evenly 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), contacts the inner lining layer (113), and is provided with a plurality of groups of liquid separation nozzles (403) to enter and be tangent to the inner surface of the inner lining layer (113).

7. A wastewater treatment system based on supercritical water oxidation according to claim 6, characterized in that: The multi-point oxygen supply mechanism (4) further comprises an oxygen supply 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 supply pipeline (404) is divided into a plurality of groups, which are evenly connected to the plurality of 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 fixedly connected between the oxygen supply pipeline (404) and the oxygen inlet (401) in sequence; and the oxygen supply pipeline outlet (409) is fixedly connected to the oxygen inlet (401).

8. A wastewater treatment system based on supercritical water oxidation according to claim 7, characterized in that: The wastewater treatment system based on supercritical water oxidation further comprises a tank cleaning mechanism (5), the tank cleaning mechanism (5) comprising 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 inlet (501) is fixedly arranged on two sets of left and right closed end covers (111) fixedly arranged on both end surfaces of the main tank body (102), respectively, and is connected to an outer air compressor; the pipe wall cleaning piston (502) is movably arranged in the inner lining layer (113); the lining layer (113) is provided with a large-diameter chip removal port (503) at the position of the main tank liquid discharge port (110); a filter box (504) is fixedly arranged between the large-diameter chip removal port and the main tank liquid discharge port (110); and filter silicon steel wool (505) is fixedly arranged in the filter box (504).

9. A wastewater treatment system based on supercritical water oxidation according to claim 8, characterized in that: The pipe wall cleaning piston (502) comprises 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); a plurality of uniform chip removal grooves (508) are provided on the primary cleaning scraper (507) along its outer circumferential surface; the secondary cleaning scraper (509) is fixedly sleeved on the piston support plate (506); the sealing ring (510) is fixedly sleeved on the piston support plate (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); the primary cleaning scraper (507) is close to the side of the large-diameter chip removal opening (503).

10. The treatment process of a wastewater treatment system based on supercritical water oxidation according to claim 9, characterized in that: The steps include: S1, wastewater passes through the main water pipe (301), is pressurized by the primary pump (302), the secondary pump (303), and the tertiary pump (304), and then enters the wastewater inlet pipe (305), is divided into two left and right paths by the liquid separation pipe (306), and then enters the liquid inlet (106) through the pipeline outlet (310) and then enters the auxiliary tank (104); S2, waste water enters the auxiliary tank body (104) through the liquid inlet (106), is heated by the flange heater (201), and then enters the inner lining layer (113) in the main tank body (102) through the main tank liquid inlet pipe (108), the induction heater (207) heats the waste liquid in the inner lining layer (113) to a specified temperature and then performs an oxidation reaction, and after the reaction, the waste water is discharged through the main tank liquid discharge port (110); S3, oxygen enters through the oxygen inlet pipeline (404), enters the priority compensation tank (405) through the oxygen supply primary pressure gauge (407), enters the pressure regulating tank (406) through the oxygen supply secondary pressure gauge (408), and then enters the oxygen inlet (401) through the oxygen supply pipeline outlet (409), and finally enters the inner lining (113) in the main tank body (102) through the liquid separation nozzle (403) on the multi-channel oxygen outlet nozzle (402) to perform an oxidation reaction; S4. When it is necessary to regularly clean the inner wall of the inner lining layer (113), the air inlet (501) on the left is connected to an air compressor, and the pipe wall cleaning piston (502) moves linearly to the right along the inner wall of the inner lining layer (113) under the action of air pressure, and the first-level cleaning scraper (507) performs segmented scraping on the inner lining layer (113), and the second-level cleaning scraper (509) performs secondary scraping on the remaining part of the inner lining layer (113), and 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; S5. After cleaning, the air inlet (501) on the right side is connected to an air compressor, and the pipe wall cleaning piston (502) moves linearly to the left along the inner wall of the lining layer (113) under the action of air pressure and returns to the initial position.

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