Supercritical water oxidation system

Abstract

The application provides a supercritical water oxidation system and relates to the technical field of environmental protection.The system comprises a pretreatment cavity, a reaction cavity and a heat exchanger; the pretreatment cavity and the reaction cavity can be communicated with each other 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 communicated with the reaction cavity; the sludge fluid outlet and the tail gas outlet are both communicated with the pretreatment cavity; and the heat exchanger is used for realizing heat exchange between the sludge fluid and the tail gas.The supercritical water oxidation system provided by the application reduces the heating amount required by the pretreatment cavity, reduces the heating cost of the pretreatment cavity, improves the energy utilization rate of the supercritical water oxidation system, and effectively saves energy.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of environmental protection, and in particular to a supercritical water oxidation system. BACKGROUND

[0002] Supercritical water oxidation technology (SCWO) is a kind of advanced oxidation technology that uses the special properties of oxidants in supercritical state to make organic matter and oxidants rapidly oxidize in supercritical water to completely decompose organic matter. SCWO is a new waste treatment technology proposed and developed by American scholar Modell in the 1980s, which has the characteristics of energy saving, high efficiency, strong applicability, etc., and has attracted the attention of environmental protection workers at home and abroad.

[0003] Supercritical water oxidation technology can treat various toxic organic wastewater, organic waste, sludge and human metabolites. Compared with other traditional methods, it has many advantages: high efficiency, wide application range, can be used for various toxic and refractory organic matter, the product does not need further treatment, can be exchanged by itself when the organic matter content is low, so it does not need external heating, fast reaction speed, simple reactor structure and large treatment capacity.

[0004] The existing supercritical water oxidation technology needs to be reacted under high temperature and high pressure conditions, and needs to consume a large amount of energy to ensure the working conditions, which is not conducive to energy saving and reducing the working cost. SUMMARY

[0005] The present application provides a supercritical water oxidation system to solve the technical problems of large energy consumption and difficulty in reducing the working cost of the supercritical water oxidation system in the prior art.

[0006] The present application provides a supercritical water oxidation system, comprising a pretreatment cavity, a reaction cavity and a heat exchanger;

[0007] The pretreatment cavity and the reaction cavity can be connected or separated;

[0008] 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 with the reaction cavity, the sludge fluid outlet and the tail gas outlet are connected with the pretreatment cavity, and the heat exchanger is used for heat exchange between the sludge fluid and the tail gas.

[0009] According to the supercritical water oxidation system provided by the present application, the tail gas inlet is connected with a first tail gas pipeline, and the first tail gas pipeline is connected with the reaction cavity;

[0010] The tail gas outlet is connected with a second tail gas pipeline, and the second tail gas pipeline is connected with the pretreatment cavity.

[0011] The sludge fluid outlet is connected with a sludge fluid pipeline, which is communicated with the pretreatment cavity.

[0012] The supercritical water oxidation system provided by the application further comprises a tail gas discharge pipeline, which is communicated with the pretreatment cavity.

[0013] The supercritical water oxidation system provided by the application, the first tail gas pipeline is provided with a first gas collecting hood at one end communicated with the reaction cavity, and the tail gas discharge pipeline is provided with a second gas collecting hood at one end communicated with the pretreatment cavity.

[0014] The supercritical water oxidation system provided by the application, the pretreatment cavity is located above the reaction cavity, and a first control valve is arranged between the pretreatment cavity and the reaction cavity, which is used for controlling the communication or separation of the pretreatment cavity and the reaction cavity.

[0015] The supercritical water oxidation system provided by the application, the first control valve is a plurality of, and the plurality of first control valves are arranged at intervals along the height direction of the pretreatment cavity.

[0016] The supercritical water oxidation system provided by the application further comprises a communicating vessel, which is communicated with the pretreatment cavity and the reaction cavity respectively.

[0017] The supercritical water oxidation system provided by the application, the pretreatment cavity and the reaction cavity are both provided with a pressure detection device, which is used for detecting the air pressure in the pretreatment cavity or the reaction cavity.

[0018] The pretreatment cavity is provided with a pressure release device, and the pressure detection device is in communication connection with the pressure release device, and the pressure release device is used for pressure relief when the pressure detection device detects that the air pressure in the pretreatment cavity and / or the reaction cavity is higher than a preset value.

[0019] The supercritical water oxidation system provided by the application, the discharge end of the sludge fluid pipeline is provided with a sludge fluid nozzle, which is used for granulating sludge fluid.

[0020] The supercritical water oxidation system provided by the application, the pretreatment cavity and the reaction cavity are both provided with a heater and a temperature detection device.

[0021] The supercritical water oxidation system provided by the application has the advantages that the heat exchanger is arranged, the sludge fluid inlet, the sludge fluid outlet, the tail gas inlet and the tail gas outlet are arranged on the heat exchanger, the sludge fluid is preheated, the heating amount required by the pretreatment cavity is reduced, the heating cost of the pretreatment cavity is reduced, the energy utilization rate of the supercritical water oxidation system is improved by using the heat of the tail gas, and the energy is effectively saved. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the application or prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0023] Figure 1 Fig. 1 is a structural schematic diagram of the supercritical water oxidation system provided by the application.

[0024] Reference signs:

[0025] 10: pretreatment cavity; 101: pressure release device; 102: first heater;

[0026] 20: reaction cavity; 201: first control valve; 203: second heater;

[0027] 30: heat exchanger; 301: first tail gas pipeline; 3011: first gas collecting cover; 302: second tail gas pipeline; 303: sludge fluid pipeline; 3031: sludge fluid nozzle; 304: sludge fluid inlet;

[0028] 40: tail gas discharge pipeline; 401: second gas collecting cover;

[0029] 50: communicating vessel;

[0030] 60: deslagging pipe; 61: second control valve;

[0031] 71: agent inlet pipe; 72: reaction agent nozzle; 73: flow guide; 74: main pipe; 75: reaction agent inlet. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the application more clear, the technical solutions in the application will be described clearly and completely in combination with the drawings in the application. Obviously, the described embodiments are some embodiments of the application, rather than all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the application.

[0033] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship of two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0034] As shown in Figure 1 The supercritical water oxidation system provided by the embodiment of the present application comprises a pretreatment cavity 10, a reaction cavity 20 and a heat exchanger 30.

[0035] The pretreatment cavity 10 and the reaction cavity 20 can communicate with each other or be separated.

[0036] The heat exchanger 30 is provided with a sludge fluid inlet 304, a sludge fluid outlet, a tail gas inlet and a tail gas outlet. The tail gas inlet communicates with the reaction cavity 20, and the sludge fluid outlet and the tail gas outlet both communicate with the pretreatment cavity 10. The heat exchanger 30 is used to realize heat exchange between the sludge fluid and the tail gas.

[0037] The sludge fluid enters the supercritical water oxidation system through the sludge fluid inlet 304 of the heat exchanger 30. After the heat exchanger 30 preheats the sludge fluid, the sludge fluid enters the pretreatment cavity 10 through the sludge fluid outlet, and then enters the reaction cavity 20 after pretreatment to perform supercritical water oxidation reaction.

[0038] Among them, a control valve or a movable partition plate is arranged between the pretreatment cavity 10 and the reaction cavity 20, for controlling the communication and separation of the pretreatment cavity 10 and the reaction cavity 20.

[0039] The pretreatment cavity 10 is a place for heating and drying pretreatment of the sludge fluid. The temperature in the pretreatment cavity 10 is at least 100℃. During the pretreatment of the sludge fluid, the control valve or the movable partition plate is closed, and the pretreatment cavity 10 is separated from the reaction cavity 20. After the pretreatment of the sludge fluid is completed, the control valve or the movable partition plate is opened, and the pretreatment cavity 10 communicates with the reaction cavity 20, so that the sludge fluid enters the reaction cavity 20 for supercritical water oxidation treatment.

[0040] Through the heating and drying treatment of the pretreatment cavity 10, the viscosity of the sludge fluid can be reduced, the risk of the sludge fluid adhering to the inner wall of the reaction cavity 20 and blocking the pipeline after entering the reaction cavity 20 can be reduced, and the corrosion of the sludge fluid to the reaction cavity 20 can be reduced.

[0041] In the reaction cavity 20, the supercritical water oxidation reaction can produce high-temperature tail gas such as carbon dioxide, water and nitrogen, and the tail gas enters the heat exchanger 30 through the tail gas inlet, the heat exchanger is a place for heat exchange between the sludge fluid and the tail gas, and the sludge fluid is preheated by using the heat of the tail gas, thereby reducing the load of the pretreatment cavity 10. After the tail gas flows through the heat exchanger 30, it enters the pretreatment cavity 10, thereby increasing the temperature in the pretreatment cavity 10, reducing the heating amount required by the pretreatment cavity 10, reducing energy consumption, and improving the energy utilization rate of the supercritical water oxidation system.

[0042] The pretreatment cavity 10 and the reaction cavity 20 are surrounded by a cylinder, and the cylinder has fasteners and sealing elements, and the openings of the cylinder are provided with flanges and sealing elements.

[0043] The cylinder can be made of carbon steel, stainless steel 304, stainless steel 310S, nickel-chromium alloy, titanium alloy or a mixture of carbon steel and refractory material. The thickness of the cylinder is 10-30 mm. The pretreatment cavity 10 also has a top cover, and the top cover and the cylinder are fastened by high-strength bolts, and a sealing ring is also arranged between the top cover and the cylinder, and the sealing ring is made of high-temperature resistant material. The cylinder has multiple temperature and pressure openings for monitoring the temperature and pressure in the cylinder, and all the temperature and pressure openings are designed with sleeves and flanges for easy installation.

[0044] The heat exchanger 30 can be a tube-type heat exchanger or a plate-type heat exchanger, and the material is carbon steel or stainless steel. The heat exchanger 30 has heat exchange elements (such as heat exchange pipes, fins, etc.) and a sludge fluid passage, and the tail gas inlet and the tail gas outlet are connected to the heat exchange elements, so that the tail gas flows into the pretreatment cavity 10 after supplying heat to the heat exchanger 30. One end of the sludge fluid passage is connected to the sludge fluid inlet 304, and the other end is connected to the sludge fluid outlet, so that the sludge fluid flows through the sludge fluid passage and is heated.

[0045] The supercritical water oxidation system provided by the application sets the heat exchanger 30, and sets the sludge fluid inlet 304, the sludge fluid outlet, the tail gas inlet and the tail gas outlet in the heat exchanger, which not only preheats the sludge fluid, reduces the heating amount required by the pretreatment cavity 10, reduces the heating cost of the pretreatment cavity 10, but also improves the energy utilization rate of the supercritical water oxidation system by using the heat of the tail gas, thereby effectively saving energy.

[0046] Further, the tail gas inlet is connected with a first tail gas pipeline 301, the first tail gas pipeline 301 is connected with the reaction cavity 20; the tail gas outlet is connected with a second tail gas pipeline 302, the second tail gas pipeline 302 is connected with the pretreatment cavity 10; the sludge fluid outlet is connected with a sludge fluid pipeline 303, and the sludge fluid pipeline 303 is connected with the pretreatment cavity 10.

[0047] The first tail gas pipeline 301 and the second tail gas pipeline 302 are connected to two ends of the heat exchange element of the heat exchanger 30 respectively, so that the tail gas enters the heat exchanger 30 through the first tail gas pipeline 301 to supply heat for the heat exchanger 30, and then flows into the pretreatment cavity 10 through the second tail gas pipeline 302. The sludge fluid inlet 304 can also be connected to an inlet pipeline, one end of a sludge fluid channel is connected to the inlet pipeline, and the other end is connected to the sludge fluid pipeline 303, so that the sludge fluid flows through the sludge fluid channel to be heated.

[0048] Further, the supercritical water oxidation system further comprises a tail gas discharge pipeline 40, and the tail gas discharge pipeline 40 is connected to the pretreatment cavity 10. One end of the tail gas discharge pipeline 40 is connected to the pretreatment cavity 10, and the other end is connected to the external environment or a tail gas treatment device.

[0049] After the tail gas enters the pretreatment cavity 10 from the reaction cavity 20, the tail gas is discharged from the supercritical water oxidation system through the tail gas discharge pipeline 40.

[0050] Specifically, the first tail gas pipeline 301 is provided with a first gas collecting cover 3011 at the end connected to the reaction cavity 20, and the tail gas discharge pipeline 40 is provided with a second gas collecting cover 401 at the end connected to the pretreatment cavity 10, so as to facilitate the collection and efficient discharge of the tail gas.

[0051] In one embodiment, the pretreatment cavity 10 and the reaction cavity 20 are arranged vertically, and the pretreatment cavity 10 is located above the reaction cavity 20. A first control valve 201 is arranged between the pretreatment cavity 10 and the reaction cavity 20, and is used to control the communication or separation between the pretreatment cavity 10 and the reaction cavity 20. When the first control valve 201 is opened, the sludge fluid enters the reaction cavity 20 from the pretreatment cavity 10 under the action of gravity.

[0052] Further, the first control valve 201 is a plurality of first control valves 201, and the plurality of first control valves 201 are arranged at intervals along the height direction of the pretreatment cavity 10.

[0053] The first control valve 201 is at least two, for example Figure 1 As shown, the two first control valves 201 are arranged at intervals along the height direction of the pretreatment cavity 10. The height direction in this embodiment refers to the vertical direction perpendicular to the ground when the pretreatment cavity 10 is placed in a working state.

[0054] By arranging a plurality of first control valves 201, the heat exchange between the pretreatment cavity 10 and the reaction cavity 20 can be reduced, the temperature in the pretreatment cavity 10 can be prevented from being too high, the stability of the supercritical water oxidation system can be ensured, independent processing spaces for the pretreatment cavity 10 and the reaction cavity 20 can be provided, and the sludge fluid can continuously enter the reaction cavity 20, thereby improving the working efficiency.

[0055] The first control valve 201 is made of heat-resistant steel and can be a manual valve, an electric valve or a pneumatic valve, and can have local control and remote control functions.

[0056] Further, the supercritical water oxidation system further comprises a communicating device 50, which is connected to the pretreatment cavity 10 and the reaction cavity 20 respectively, and is used to maintain the air pressure balance of the pretreatment cavity 10 and the reaction cavity 20.

[0057] By arranging the communicating device 50, the air pressure imbalance between the pretreatment cavity 10 and the reaction cavity 20 can be avoided, and the stability of the supercritical water oxidation system can be ensured.

[0058] Further, the pretreatment cavity 10 and the reaction cavity 20 are each provided with a pressure detection device, which is used to detect the air pressure in the pretreatment cavity 10 or the reaction cavity 20.

[0059] The pretreatment cavity 10 is provided with a pressure release device 101, the pressure detection device is in communication connection with the pressure release device 101, and the pressure release device 101 is used to release pressure when the pressure detection device detects that the air pressure in the pretreatment cavity 10 and / or the reaction cavity 20 is higher than a preset value, so that the air pressure is less than the preset value.

[0060] Specifically, the pretreatment cavity 10 is provided with a pressure release port, and the pressure release port is provided with the pressure release device 101, which can be a self-operated pressure regulating valve.

[0061] The pretreatment cavity 10 and the reaction cavity 20 are each provided with a plurality of pressure detection devices, which can improve the accuracy of air pressure detection. Since the pretreatment cavity 10 and the reaction cavity 20 are connected through the communicating device 50, the pressure release device 101 arranged in the pretreatment cavity 10 can release pressure of the supercritical water oxidation system, and the safety of the system can be improved.

[0062] Preferably, the pressure detection device has local display and remote monitoring functions.

[0063] In a specific embodiment, the pressure detection device is a pressure transmitter. If the air pressure in the pretreatment cavity 10 and / or the reaction cavity 20 is too high and exceeds the preset value, the pressure release device 101 can automatically open to release pressure, so that the air pressure in the pretreatment cavity 10 and the reaction cavity 20 is maintained within a preset safe range, and the safety and reliability of the supercritical water oxidation system can be ensured.

[0064] In a further embodiment, the discharge end of the sludge fluid pipeline 303 is provided with a sludge fluid nozzle 3031, which is used to granulate the sludge fluid.

[0065] The sludge fluid is heated by the heat exchanger 30, dried, and then flows through the sludge fluid pipe 303, forms sludge particles under the high-speed injection of the sludge fluid nozzle 3031, and is heated and dried again in the pretreatment cavity 10, which is conducive to improving the contact area of the sludge fluid and the reaction agent in the reaction cavity 20 and improving the reaction efficiency.

[0066] Further, the pretreatment cavity 10 and the reaction cavity 20 are each provided with a heater and a temperature detection device. For example Figure 1 As shown, the pretreatment cavity 10 is provided with a first heater 102, and the reaction cavity 20 is provided with a second heater 203.

[0067] The heater is used to heat the pretreatment cavity 10 and the reaction cavity 20 to reach the working temperature. The heat source of the heater can be one or more of an electric heater, plasma, or natural gas. Preferably, the heating temperature of the heater can be controlled.

[0068] The pretreatment cavity 10 and the reaction cavity 20 are each provided with a plurality of temperature detection devices, which are helpful to obtain the temperature at different positions. The temperature detection device can adopt a thermocouple or a thermal resistance. Preferably, the temperature detection device is plug-in type, which is connected to the pretreatment cavity 10 and the reaction cavity 20 through detachable connection (such as flange connection or threaded connection), facilitating disassembly and replacement.

[0069] The heater and the temperature detection device can also be communicatively connected, further improving the accuracy and automation degree of temperature regulation.

[0070] Further, the bottom of the reaction cavity 20 is provided with a slag discharge port, the bottom of the slag discharge port is connected to a slag discharge pipe 60, and the slag discharge pipe 60 is provided with a second control valve 61.

[0071] The slag generated in the reaction in the reaction cavity 20 flows downward and is discharged from the slag discharge pipe 60 through the slag discharge port.

[0072] Preferably, the second control valve 61 is a plurality of second control valves 61, which are arranged at intervals on the slag discharge pipe 60. Specifically, as shown Figure 1 Two second control valves 61 are arranged at intervals along the flow direction in the slag discharge pipe 230. When the slag is generated in the reaction in the reaction cavity 20, the second control valve 61 located upstream is opened, the second control valve 61 located downstream is closed, and the slag falls between the two second control valves 61; then the second control valve 61 located upstream is closed, the second control valve 61 located downstream is opened, so that the slag is discharged to the corresponding collection device through the slag discharge pipe 60, and since the second control valve 61 located upstream is closed, the reaction agent in the reaction cavity 20 will not flow out, realizing continuous slag discharge without stopping the system.

[0073] The second control valve 61 is made of heat-resistant steel and can be a manual valve, an electric valve or a pneumatic valve, etc., and can have local control and remote control functions.

[0074] The supercritical water oxidation system provided in the embodiment of the present invention further includes a reactant injection device, which is installed in the pretreatment chamber 10 .

[0075] The reactant injection device includes a feed pipe 71 , which is passed through the wall of the reaction chamber 20 . A reactant nozzle 72 is provided at one end of the feed pipe 71 located in the reaction chamber 20 .

[0076] The length direction of the reagent inlet pipe 71 is perpendicular to the height direction of the reaction chamber 20. The reagent sprayed from the reagent nozzle 72 can form a cyclone in the reaction chamber 20, thereby preventing corrosion products from corroding the chamber wall and increasing the oxidation rate of the reagent on the sludge.

[0077] The reactant nozzle 72 can be tilted relative to the horizontal or vertical plane to generate cyclones in different directions. In one embodiment, the reactant nozzle 72 is a double-ended, bidirectional nozzle, one end of which is perpendicular to the height of the reaction chamber 20, spraying the reactant horizontally; the other end is parallel to the height of the reaction chamber 20, spraying the reactant upward.

[0078] The reactant injection device also includes a guide member 73, which is installed at one end of the feed pipe 71 located in the reaction chamber 20 and is spaced apart from the reactant nozzle 72. The guide member 73 has a guide surface, and the discharge direction of the reactant nozzle 72 obliquely intersects with the guide surface 0.

[0079] Combine Figure 1 As shown, the guide member 73 described in this embodiment is a guide plate and can be made of a heat-resistant and corrosion-resistant material (such as 310S). The side of the guide member 73 close to the reactant nozzle 72 is a guide surface, which can be a flat surface, an arc surface, or other special-shaped surfaces. The guide member 73 is made of a heat-resistant and corrosion-resistant material such as nickel-chromium, and the installation angle can be adjusted. The guide member 73 cooperates with the reactant nozzle 72 to generate a rotary shearing force in the reaction chamber 20, enveloping the supercritical water oxidation reaction products and allowing them to enter the slag discharge pipe 60 for discharge from the system.

[0080] The arrangement of the guide member 73 and the reactant nozzle 72, on the one hand, increases the contact area between the sludge particles and the reactant, thereby improving the reaction efficiency; on the other hand, it reduces the probability of the supercritical water oxidation reaction products colliding with the wall of the reaction chamber 20, thereby reducing the risk of corrosion of the reaction chamber 20.

[0081] Furthermore, there are multiple inlet pipes 71 , which are interconnected and spaced apart along the height direction of the reaction chamber 20 .

[0082] likeFigure 1 As shown, the reactant injection device also includes a main pipe 74. Multiple feed pipes 71 are connected to the main pipe 74 and serve as branch pipes of the main pipe 74. A reactant inlet 75 is provided at one end of the main pipe 74. The reactant enters the main pipe 74 through the reactant inlet 75 and enters the reaction chamber 20 through the multiple feed pipes 71. Each feed pipe 71 can also be individually controlled to accurately control the amount of reactant injected.

[0083] The plurality of feed pipes 71 are spaced apart along the height direction of the reaction chamber 20 , forming cyclones of corresponding heights in the reaction chamber 20 , thereby improving the reaction efficiency.

[0084] There may be one or more reactant injection devices. In a specific embodiment, Figure 1 As shown, there are two reactant injection devices, which are distributed around the circumference of the reaction chamber 20. Each reactant injection device has two feed pipes 71. The heights of the feed pipes 71 of the two reactant injection devices correspond to each other to better form a cyclone.

[0085] It should be noted that the pipes in the embodiment of the present invention, including but not limited to the first tail gas pipe 301, the second tail gas pipe 302, the sludge fluid pipe 303, the slag discharge pipe 60, and the feed pipe 71, are made of heat-resistant and corrosion-resistant materials in the pretreatment chamber 10 and the reaction chamber 20, and are made of corrosion-resistant materials such as PP (polypropylene), fiberglass or stainless steel in the parts outside the pretreatment chamber 10 and the reaction chamber 20.

[0086] The supercritical water oxidation system provided by the embodiment of the present invention has a simple and sophisticated structure, strong practicality, a wide range of applications, and is in a closed environment. The sludge fluid can be treated to meet standards, reducing environmental pollution.

[0087] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A supercritical water oxidation system, characterized in that: It includes a pretreatment chamber, a reaction chamber and a heat exchanger; The pretreatment chamber and the reaction chamber can be connected to or separated from each other; 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, and the sludge fluid outlet and the tail gas outlet are both connected to the pretreatment chamber. The heat exchanger is used to realize heat exchange between the sludge fluid and the tail gas.

2. The supercritical water oxidation system according to claim 1, characterized in that The tail gas inlet is connected to a first tail gas pipeline, and the first tail gas pipeline is connected to the reaction chamber; The tail gas outlet is connected to a second tail gas pipeline, and the second tail gas pipeline is connected to the pretreatment chamber; The sludge fluid outlet is connected to a sludge fluid pipeline, and the sludge fluid pipeline is communicated with the pretreatment chamber.

3. The supercritical water oxidation system according to claim 2, characterized in that The supercritical water oxidation system further includes a tail gas exhaust pipe, which is connected to the pretreatment chamber.

4. The supercritical water oxidation system according to claim 3, characterized in that A first gas collecting hood is provided at one end of the first tail gas pipeline communicating with the reaction chamber, and a second gas collecting hood is provided at one end of the tail gas exhaust pipeline communicating with the pretreatment chamber.

5. The supercritical water oxidation system according to claim 1, characterized in that The pretreatment chamber is located above the reaction chamber. A first control valve is provided between the pretreatment chamber and the reaction chamber. The first control valve is used to control the connection or separation between the pretreatment chamber and the reaction chamber.

6. The supercritical water oxidation system according to claim 5, characterized in that There are multiple first control valves, and the multiple first control valves are arranged at intervals along the height direction of the pretreatment chamber.

7. The supercritical water oxidation system according to claim 1, characterized in that The supercritical water oxidation system further includes a communicating vessel, which is respectively connected to the pretreatment chamber and the reaction chamber.

8. The supercritical water oxidation system according to claim 7, characterized in that: A pressure detection device is provided in both the pretreatment chamber and the reaction chamber, and the pressure detection device is used to detect the air pressure in the pretreatment chamber or the reaction chamber; The pretreatment chamber is provided with a pressure release device, and the pressure detection device is communicatively connected to the pressure release device. The pressure release device is used to release pressure when the pressure detection device detects that the air pressure in the pretreatment chamber and / or the reaction chamber is higher than a preset value.

9. The supercritical water oxidation system according to claim 1, characterized in that: A sludge fluid nozzle is provided at the discharge end of the sludge fluid pipeline, and the sludge fluid nozzle is used to granulate the sludge fluid.

10. The supercritical water oxidation system according to claim 1, characterized in that: The pretreatment chamber and the reaction chamber are both provided with a heater and a temperature detection device.

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