A waste based critical water recycling treatment system

Abstract

The application discloses a kind of based on waste critical water circulation processing system, comprising: the sequentially arranged storage tank, high-pressure pump, heat exchanger, reactor, heater, oxidizing agent device and separation component;The high-pressure pump is arranged between the storage tank and the heat exchanger;The heat exchanger includes first pipeline and second pipeline;Two ends of the first pipeline are connected with the high-pressure pump and the top of the reactor respectively, the bottom of the reactor is connected with the second pipeline, the other end of the second pipeline is connected with the separation component.The application utilizes the unique properties of critical water, safely, effectively and completely converts waste into harmless substances, and the converted water is partially recycled in the application.The special design of the reactor can isolate the reaction medium from the inner wall of the reactor, which avoids the corrosion of the reaction medium on the pressure-bearing outer wall and the deposition of inorganic salts on the pressure-bearing outer wall compared with the prior art.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of waste treatment, and particularly relates to a waste supercritical water circulating treatment system. BACKGROUND

[0002] Supercritical water refers to water whose density due to high temperature and whose density of water vapor due to high pressure are the same when the gas pressure and temperature reach a certain value. At this time, the liquid and gas of water are not distinguished and are completely mixed together to become a new fluid in a high pressure and high temperature state. Andrea points out that supercritical water has two significant characteristics. One is strong reaction activity. When the substance to be treated is put into supercritical water and oxygen and hydrogen peroxide are filled, the substance will be oxidized and hydrolyzed.

[0003] When water exceeds its critical condition, supercritical water state is formed. Supercritical water is a non-polar substance with high solubility and good transport performance, and can be mutually soluble with gases such as N2, O2 or air in any proportion, while the dissociation constant and solubility of inorganic salts in supercritical water are much smaller than those under normal temperature and pressure. Using the special properties of supercritical water, organic matter can be oxidized by oxidizing agent (mainly O2) into complete product CO2 and water, and heteroatoms Cl, S and P in organic matter are converted into corresponding inorganic acids HCl, H2SO4 or H3PO4, and nitrogen-containing organic matter is oxidized into N2 and N2O. The reaction temperature of a typical supercritical water oxidation process is 500-700 DEG C, the pressure is 24-50 MPa, and the complete reaction time is not more than a few minutes.

[0004] At present, the existing waste supercritical water treatment technology still has the following problems:

[0005] 1. The acids formed in the treatment process of organic matter containing halogen, sulfur or phosphorus cause corrosion of the reactor;

[0006] 2. Most industrial wastewater contains a high concentration of salt, and the inorganic salt precipitated from the wastewater under the supercritical state causes serious blockage of the reactor.

[0007] Therefore, it is necessary to provide a waste supercritical water circulating treatment system to solve the above technical problems. SUMMARY

[0008] The present application overcomes the shortcomings of the prior art and provides a waste supercritical water circulating treatment system.

[0009] To achieve the above object, the technical scheme adopted by the present application is as follows: a waste critical water circulation treatment system, comprising: successively arranged a storage tank, a high-pressure pump, a heat exchanger, a reactor, a heater, an oxidant device and a separation assembly; the high-pressure pump is arranged between the storage tank and the heat exchanger;

[0010] The heat exchanger comprises a first pipeline and a second pipeline; two ends of the first pipeline are respectively connected with the high-pressure pump and the top of the reactor, the bottom of the reactor is connected with the second pipeline, and the other end of the second pipeline is connected with the separation assembly;

[0011] The reactor comprises: successively arranged from outside to inside a pressure-bearing outer wall, a reaction inner tube and a salt-repellent membrane; a water flow channel is left between the pressure-bearing outer wall and the reaction inner tube, the salt-repellent membrane is in the shape of a cylinder and is attached to the inner wall of the reaction inner tube, and the first pipeline and the second pipeline are respectively connected with the upper and lower ends of the reaction inner tube;

[0012] The oxidant device is connected with the reaction inner tube and inputs an oxidant into the reaction inner tube;

[0013] The heater is connected with the upper and lower ends of the water flow channel through two pipelines respectively, for injecting supercritical water into the water flow channel, and the supercritical water penetrates into the reaction zone through the reaction inner tube and the salt-repellent membrane radially;

[0014] The separation assembly is used for separating the reaction product discharged from the reactor into gas, water and inert ash, wherein the separated water is fed into the heater.

[0015] In a preferred embodiment of the present application, the top of the storage tank is provided with a waste slurry inlet.

[0016] In a preferred embodiment of the present application, the high-pressure pump pumps the waste slurry in the storage tank into the heat exchanger, and the heat exchanger preheats the passing waste slurry.

[0017] In a preferred embodiment of the present application, the reactor is vertically arranged, and the reaction inner tube and the pressure-bearing outer wall are arranged with the same center, and the reaction inner tube is made of a hydrophilic regular porous polymer material prepared by stirring and adding ammonia water to react an acetone solution of a hydrophilic monomer methacrylic acid, a fluorinated alkyl monomer perfluorohexyl ethyl methacrylate, a crosslinking agent polyethylene glycol diacrylate and pentaerythritol tetra mercaptoacetate.

[0018] In a preferred embodiment of the present application, the upper and lower ends of the salt-repellent membrane are respectively detachably connected with the reaction inner tube.

[0019] In a preferred embodiment of the present application, the first pipeline and the second pipeline are spirally wound with each other.

[0020] In a preferred embodiment of the present application, the separation assembly comprises a gas-liquid separator and a slag-water separator; the gas-liquid separator separates the reaction product passing through the heat exchanger into gas and liquid, and the gas is discharged;

[0021] The slag-water separator is used to separate the separated liquid into water and inert slag, and the inert slag comprises solid materials such as inorganic salts.

[0022] The use method of the waste critical water circulation treatment system based on the above-mentioned any one comprises the following steps:

[0023] S1, pulp the waste raw materials and pour them into the inside of the storage tank;

[0024] S2, use the high-pressure pump to extract the waste slurry from the inside of the storage tank and send it to the first pipeline of the heat exchanger for preheating;

[0025] S3, the preheated waste slurry and oxidizing agent enter the reaction inner tube from the top of the reactor, and the heater injects supercritical water heated by water into the water flow channel, the supercritical water penetrates through the reaction inner tube and the salt-tolerant membrane, enters the reaction zone, and reacts with the waste slurry and the oxidizing agent in the inside of the reactor;

[0026] S4, the generated reaction product enters the second pipeline from the bottom of the reactor, exchanges heat with the waste slurry in the first pipeline, and is sent to the separator to be separated into gas, water and inert slag;

[0027] S5, the separated water flows into the heater again to be heated to form supercritical water.

[0028] In a preferred embodiment of the present application, in the S3, the supercritical water in the water flow channel reenters the heater from the bottom of the water flow channel.

[0029] In a preferred embodiment of the present application, in the S3, the precipitation of inorganic salts in the oxidation reaction is blocked in the salt-tolerant membrane, and under high salt concentration, the salt-tolerant membrane will expand and deform towards the high concentration direction, and after several oxidation reactions, the salt-tolerant membrane is separated from the reaction inner tube.

[0030] The present application solves the defects in the background art and has the following beneficial effects:

[0031] (1) The application provides a waste critical water circulation treatment system, which utilizes the unique properties of critical water to safely, effectively and completely convert waste into harmless substances, and the part of the converted water is recycled in the application, and the special design of the reactor can isolate the reaction medium from the inner wall of the reactor, compared with the prior art, the application avoids the corrosion of the reaction medium on the pressure outer wall and the deposition of inorganic salts on the pressure outer wall.

[0032] (2) The application sets a reaction inner tube in the reactor, the reaction inner tube is a hydrophilic regular porous polymer material, and a water flow channel is left between the pressure outer wall and the reaction inner tube, supercritical water is injected into the water flow channel, the supercritical water penetrates into the salt-repellent membrane on the inside of the reaction inner tube through the porous tube wall to perform oxidation reaction, so that an annular water curtain is formed in the water flow channel, which isolates the direct contact between the reaction medium and the pressure outer wall, solves the problems of corrosion of the reaction medium on the pressure outer wall and deposition of inorganic salts on the pressure outer wall, improves the service life of the reactor and reduces the blockage.

[0033] (3) The application sets a salt-repellent membrane on the inside of the reaction inner tube, the salt-repellent membrane is a salt-sensitive membrane material, can block the separated inorganic salts, and has good water permeability, ensures the normal use of the reactor, blocks the inorganic salts on the inside of the salt-repellent membrane, and avoids the deposition of the inorganic salts on the reaction inner tube to affect the circulation of the supercritical water.

[0034] (4) The application is provided by cooperation of the reaction inner tube and the salt-repellent membrane, the reaction inner tube is a hydrophilic modified porous material, can attract and interact with water molecules, makes water molecules more easily diffuse and penetrate on the surface of the material, reduces the surface tension between water molecules and the surface of the material, improves the permeability of the supercritical water, and the regular porous structure can make the supercritical water penetrate through the surface of the salt-repellent membrane, further improves the permeability of the supercritical water.

[0035] (5) The salt-repellent membrane in the application will swell and deform towards the high concentration direction under high salt concentration, after several oxidation reactions, the salt-repellent membrane is separated from the reaction inner tube, and the upper end and the lower end of the salt-repellent membrane are respectively detachably connected with the reaction inner tube, when the deformation of the salt-repellent membrane is large and the salt blocking effect is reduced, the salt-repellent membrane is convenient to replace, ensures the normal use of the reactor, compared with the cleaning of the inner wall of the reactor in the prior art, the operation is simple, time-saving and labor-saving.

[0036] (6) The application sets a spiral-shaped heat exchanger, the first pipeline flows with waste slurry, and the second pipeline flows with reaction products, the high temperature of the discharged reaction products is used for heat exchange with the waste slurry, the waste slurry is preheated, the temperature of the reaction products is reduced, the energy utilization rate is improved, and the complexity of the system is reduced.

[0037] (7) The present application is provided with a heater, which heats water to a supercritical state in a high-temperature and high-pressure environment, injects the supercritical water into a water flow channel, discharges reaction products, and recycles the remaining supercritical water into the heater, and separates the water from the reaction products and re-enters the heater to supplement the supercritical water, thereby realizing water circulation in the system, saving water resources, and reducing energy consumption. BRIEF DESCRIPTION OF DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0039] Figure 1 is a perspective view of a preferred embodiment of the present application;

[0040] Figure 2 is a reactor internal structure diagram of a preferred embodiment of the present application;

[0041] Figure 3 is a use method flow chart of a preferred embodiment of the present application;

[0042] In the figure: 1, storage tank; 2, high-pressure pump; 3, heat exchanger; 4, reactor; 41, pressure-bearing outer wall; 42, reaction inner tube; 43, salt-permeable membrane; 44, water flow channel; 5, heater; 6, gas-liquid separator; 7, slag-water separator. DETAILED DESCRIPTION

[0043] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0044] In the following description, many specific details are set forth in order to provide a thorough understanding of the present application, but the present application can also be implemented in other ways different from those described herein, therefore, the scope of protection of the present application is not limited by the specific embodiments disclosed below.

[0045] In the description of the present application, it needs to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the scope of protection of the present application. In addition, the terms "first", "second" and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" and the like can be explicitly or implicitly included one or more. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0046] In the description of the present application, it needs to be understood that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood through specific circumstances.

[0047] As Figure 1 shown, the present application provides a waste critical water circulation treatment system, comprising: a storage tank 1, a high-pressure pump 2, a heat exchanger 3, a reactor 4, a heater 5, an oxidizing agent device and a separation assembly arranged in sequence; the high-pressure pump 2 is arranged between the storage tank 1 and the heat exchanger 3; the top of the storage tank 1 is provided with a waste slurry inlet.

[0048] The waste is liquid and solid, and the waste is stirred with water to form a waste slurry, which is poured into the storage tank 1 from the waste slurry inlet.

[0049] The high-pressure pump 2 in the embodiment pumps the waste slurry in the storage tank 1 into the heat exchanger 3, and the heat exchanger 3 preheats the passing waste slurry.

[0050] The liquid suction end and the liquid outlet end of the high-pressure pump 2 are connected with the storage tank 1 and the heat exchanger 3 through pipelines respectively, and the high-pressure pump 2 pumps the waste slurry from the storage tank 1 to the heat exchanger 3.

[0051] The heat exchanger 3 in this embodiment includes a first pipe and a second pipe; the two ends of the first pipe are connected to the top of the high-pressure pump 2 and the reactor 4, respectively, the bottom of the reactor 4 is connected to the second pipe, and the other end of the second pipe is connected to the separation component; the first pipe and the second pipe are spirally intertwined.

[0052] The waste slurry drawn from the storage tank 1 by the high-pressure pump 2 is pumped into the first pipeline and then into the reactor 4. The reaction products discharged from the reactor 4 flow to the separation component through the second pipeline. The high temperature of the discharged reaction products is used to exchange heat with the waste slurry, preheating the waste slurry while reducing the temperature of the reaction products, improving energy utilization and reducing the complexity of the system.

[0053] like Figure 2 As shown, reactor 4 includes: a pressure-bearing outer wall 41, a reaction inner tube 42, and a salt-repellent membrane 43 arranged sequentially from the outside to the inside; a water flow channel 44 is left between the reaction inner tube 42 and the pressure-bearing outer wall 41; the salt-repellent membrane 43 is cylindrical and fits against the inner wall of the reaction inner tube 42; the first pipe and the second pipe are respectively connected to the upper and lower ends of the reaction inner tube 42; reactor 4 is arranged vertically, and the reaction inner tube 42 is arranged concentrically with the pressure-bearing outer wall 41; the reaction inner tube 42 is made of a hydrophilic regular porous polymer material prepared by stirring and adding ammonia to an acetone solution of hydrophilic monomer methacrylic acid, fluoroalkyl monomer perfluorohexylethyl methacrylate, crosslinking agent polyethylene glycol diacrylate, and pentaerythritol tetramercaptoacetate.

[0054] The pressure-bearing outer wall 41 is preferably made of stainless steel, which has good corrosion resistance and mechanical strength, ensuring the high temperature and high pressure reaction environment inside the reactor 4.

[0055] The inner reaction tube 42 is made of a hydrophilic modified porous polymer material. This porous polymer material is made by mixing hydrophilic monomer methacrylic acid, fluoroalkyl monomer perfluorohexylethyl methacrylate, crosslinking agent polyethylene glycol diacrylate, and pentaerythritol tetramercaptoacetate in a ratio of 0.2:0.4:1.7:1, and mixing with acetone solution in a ratio of 3:1. The mixture is stirred and ammonia water is added to react and produce a porous material. The material is then shaped and dried to obtain the hydrophilic modified porous polymer material. A water channel 44 is left between the inner reaction tube 42 and the pressure-bearing outer wall 41. Supercritical water is injected into the water channel 44. This supercritical water penetrates radially through the porous tube wall into the salt-phobic membrane 43 inside the inner reaction tube 42 for oxidation reaction, thereby forming an annular water curtain in the water channel 44. This isolates the reaction medium from direct contact with the pressure-bearing outer wall 41, solving the problems of corrosion of the pressure-bearing outer wall 41 by the reaction medium and precipitation of inorganic salts on the pressure-bearing outer wall 41, improving the service life of the reactor 4, and reducing clogging.

[0056] The salt-repellent membrane 43 is a modified microfiltration membrane material with high flux and high salt retention rate, which can block the separated inorganic salt and has good water permeability, so as to ensure the normal use of the reactor 4, block the inorganic salt inside the salt-repellent membrane 43, and avoid the precipitation of the inorganic salt on the reaction inner tube 42, thereby affecting the circulation of supercritical water.

[0057] It is worth noting that the reaction inner tube 42 is a porous material modified to be hydrophilic, which can attract and interact with water molecules, so that the water molecules can more easily diffuse and permeate on the surface of the material, reduce the surface tension between the water molecules and the surface of the material, improve the permeability of supercritical water, and the regular porous structure can make the supercritical water permeate the surface of the salt-repellent membrane 43, further improve the permeability of supercritical water, and the reaction inner tube 42 provides support for the salt-repellent membrane 43.

[0058] The upper and lower ends of the salt-repellent membrane 43 in the embodiment are detachably connected with the reaction inner tube 42.

[0059] The connection mode between the salt-repellent membrane 43 and the reaction inner tube 42 is preferably that a stainless steel snap ring is used to fix the salt-repellent membrane 43 on the reaction inner tube 42, the stainless steel snap ring includes a long strip structure, the long strip structure is annular, both ends of the long strip structure are welded with fixing ears, the fixing ears are arranged towards the inner side, and the surfaces of the fixing ears are provided with through holes, adjusting bolts are installed on the through holes, the distance between the fixing ears is controlled by adjusting the position of the adjusting nut on the bolt, so as to control the diameter of the annular long strip structure. The annular long strip structure is used to abut the salt-repellent membrane 43 on the wall of the reaction inner tube 42, which is simple in structure and convenient to replace.

[0060] The oxidant device in the embodiment is connected with the reaction inner tube 42 to input the oxidant into the reaction inner tube 42.

[0061] The oxidant delivered by the oxidant device can be O2 or H2O2, and the corresponding delivery equipment includes a compressor and a delivery pump.

[0062] The heater 5 in the embodiment is connected with the upper and lower ends of the water flow channel 44 through two pipelines respectively, for injecting supercritical water into the water flow channel 44, and the supercritical water penetrates the reaction inner tube 42 and the salt-repellent membrane 43 radially into the reaction zone.

[0063] The heater 5 provides a high-temperature and high-pressure environment for water, heats the normal water to a supercritical state, and forms supercritical water.

[0064] The separation assembly in the embodiment is used for separating the reaction product discharged from the reactor 4 into gas, water and inert ash, wherein the separated water part is fed into the heater 5; the separation assembly comprises a gas-liquid separator 6 and a slag-water separator 7; the gas-liquid separator 6 separates the reaction product passing through the heat exchanger 3 into gas and liquid, the gas is discharged and the separated gas is mainly CO2 and can be directly discharged; the slag-water separator 7 is used for separating the separated liquid into water and inert ash again, and the inert ash includes solid materials such as inorganic salts.

[0065] As shown in Figure 3 The application also provides a use method of the waste critical water circulation treatment system, which comprises the following steps:

[0066] S1, pulp the waste raw material and pour into the inside of the storage tank 1;

[0067] S2, use the high-pressure pump 2 to pump the waste slurry out of the inside of the storage tank 1 and send it into the first pipeline of the heat exchanger 3 for preheating;

[0068] S3, the preheated waste slurry and oxidizing agent enter the reaction inner tube 42 from the top of the reactor 4, at the same time, the heater 5 injects the supercritical water heated by water into the water flow channel 44, the supercritical water penetrates through the reaction inner tube 42 and the salt-tolerant membrane 43 and enters the reaction zone to react with the waste slurry and the oxidizing agent in the inside of the reactor 4;

[0069] S4, the generated reaction product enters the second pipeline from the bottom of the reactor 4, exchanges heat with the waste slurry in the first pipeline and is separated into gas, water and inert ash in the separator;

[0070] S5, the separated water part flows into the heater 5 again to form supercritical water.

[0071] In S3, the supercritical water in the water flow channel 44 enters the heater 5 again from the bottom of the water flow channel 44.

[0072] The heater 5 heats the water to a supercritical state in a high-temperature and high-pressure environment, the supercritical water injected into the water flow channel 44 is discharged together with the reaction product, the remaining part of the supercritical water enters the heater 5 again for recycling, and the separated water part from the reaction product reenters the heater 5 to supplement the supercritical water, realizing the circulation of water in the system, saving water resources and reducing energy consumption.

[0073] In S3, the precipitation of inorganic salts in the oxidation reaction is blocked in the salt-tolerant membrane 43, under high salt concentration, the salt-tolerant membrane 43 will expand and deform towards the high concentration direction, and after several oxidation reactions, the salt-tolerant membrane 43 is separated from the reaction inner tube 42.

[0074] The salt-repellent film 43 will expand and deform towards the high concentration direction under high salt concentration. After several oxidation reactions, the salt-repellent film 43 is separated from the inner reaction tube 42, and the inner reaction tube 42 is protected. The upper and lower ends of the salt-repellent film 43 are respectively detachably connected with the inner reaction tube 42. When the deformation of the salt-repellent film 43 is large and the salt-repellent effect is reduced, the salt-repellent film 43 is conveniently replaced, so that the normal use of the reactor 4 is ensured. Compared with the cleaning of the inner wall of the reactor 4 in the prior art, the operation is simple, time-saving and labor-saving.

[0075] The above is based on the ideal embodiment of the present application, through the above description, relevant personnel can make various changes and modifications without deviating from the technical idea of the present application. The technical scope of the present application is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims

1. A waste based critical water cycle treatment system comprising: The sequentially arranged storage tank, high-pressure pump, heat exchanger, reactor, heater, oxidant device and separation assembly are characterized in that the high-pressure pump is arranged between the storage tank and the heat exchanger. The heat exchanger comprises a first pipe and a second pipe; the two ends of the first pipe are connected with the high-pressure pump and the top of the reactor respectively; the bottom of the reactor is connected with the second pipe; the other end of the second pipe is connected with the separation assembly. The reactor comprises a pressure-bearing outer wall, a reaction inner tube and a salt-repellent membrane arranged sequentially from outside to inside; a water flow channel is left between the pressure-bearing outer wall and the reaction inner tube; the salt-repellent membrane is in the shape of a cylinder and is attached to the inner wall of the reaction inner tube; the first pipe and the second pipe are connected with the upper and lower ends of the reaction inner tube respectively. The reaction inner tube is made of hydrophilic modified porous polymer material; the porous polymer material is prepared by mixing hydrophilic monomer methacrylic acid, fluorinated alkyl monomer perfluorohexyl ethyl methacrylic acid ester, crosslinking agent polyethylene glycol diacrylate and pentaerythritol tetra-sulfur acetic ester in a ratio of 0.2:0.4:1.7:1, then mixing with acetone solution in a ratio of 3:1, stirring and adding ammonia water for reaction to obtain the porous material; the hydrophilic modified porous polymer material is obtained by molding and drying. The oxidant device is connected with the reaction inner tube and inputs oxidant into the reaction inner tube. The heater is connected with the upper and lower ends of the water flow channel through two pipes respectively and is used for injecting supercritical water into the water flow channel; the supercritical water penetrates into the reaction zone through the reaction inner tube and the salt-repellent membrane radially; the salt-repellent membrane has salt sensitivity and will swell and deform towards the high concentration direction under high salt concentration; after several oxidation reactions, the salt-repellent membrane is separated from the reaction inner tube; the upper and lower ends of the salt-repellent membrane are detachably connected with the reaction inner tube. The separation assembly is used for separating the reaction products discharged from the reactor into gas, water and inert ash; part of the separated products is input into the heater.

2. The waste-based critical water recycling system according to claim 1, wherein: The top of the storage tank is provided with a waste slurry inlet.

3. The waste-based critical water recycling system according to claim 1, wherein: The high-pressure pump pumps the waste slurry in the storage tank into the heat exchanger; the heat exchanger preheats the passing waste slurry.

4. The waste-based critical water recycling system according to claim 1, wherein: The reactor is vertically arranged and the reaction inner tube and the pressure-bearing outer wall are arranged with the same center.

5. The waste based critical water recycling system according to claim 1, wherein: The first pipe and the second pipe are spirally wound with each other.

6. The waste-based critical water recycling system according to claim 1, wherein: The separation assembly comprises a gas-liquid separator and a slag-water separator; the gas-liquid separator separates the reaction products passing through the heat exchanger into gas and liquid and discharges the gas; The slag-water separator is used for separating the separated liquid into water and inert ash again; the inert ash comprises inorganic salt.

7. A method of using a waste-based critical water cycle processing system according to any one of claims 1-6, characterized in that, The method comprises the following steps: S1, slurry is prepared from waste raw materials and is poured into the inside of the storage tank; S2, the waste slurry is pumped out from the inside of the storage tank by using the high-pressure pump and is sent into the first pipe of the heat exchanger for preheating; S3, the preheated waste slurry and oxidant enter the reaction inner tube from the top of the reactor, while the heater heats the water to form supercritical water and injects it into the water flow channel, which permeates through the reaction inner tube and the salt-repellent membrane into the reaction zone to react with the waste slurry and oxidant inside the reactor; S4, the generated reaction products enter the second pipeline from the bottom of the reactor, exchange heat with the waste slurry in the first pipeline, and are separated into gas, water and inert ash in the separator; S5, the separated water is again injected into the heater to form supercritical water.

8. The method of using a waste-based critical water recycling system according to claim 7, wherein: In the S3, the supercritical water in the water flow channel reenters the heater from the bottom of the water flow channel.

9. The method of using a waste-based critical water recycling system according to claim 7, wherein: In the S3, the precipitation of inorganic salts in the oxidation reaction is blocked in the salt-repellent membrane.

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