A supercritical water oxidation system for continuously discharging salt sludge

Abstract

The application relates to a supercritical water oxidation system capable of continuously discharging salt residues, which comprises a reactor, a waste liquid branch, an oxygen branch, a product branch and a salt discharge branch; the reactor is internally provided with a reaction channel, a product channel and a separation zone; the product channel is arranged outside the reaction channel; the separation zone is located below the reaction channel and the product channel; the reaction channel and the product channel are communicated with the separation zone; the waste liquid branch is used for preheating and pressurizing the waste liquid, and the preheating temperature is lower than a preset value; the preheated and pressurized waste liquid is then delivered into the reaction channel; the oxygen branch is used for pressurizing oxygen; part of the pressurized oxygen is input into the salt discharge branch; the other part of the pressurized oxygen is mixed with preheated oxygen; and the mixed oxygen is delivered into the reaction channel. The system is used for solving the technical problems that inorganic salts are prone to depositing in the preheating stage, thereby affecting the degradation efficiency in the reaction stage, and the discharge of the salt residues lacks safe and reliable means.

Description

Technical Field

[0001] This invention relates to the field of energy system technology, specifically to a supercritical water oxidation system with continuous salt slag discharge. Background Technology

[0002] When supercritical water is used to oxidize high-salt organic waste liquid, inorganic salts tend to deposit during the preheating stage, and can affect the degradation efficiency during the reaction stage. Furthermore, there is a lack of safe and reliable means to remove the salt residue.

[0003] High-salt, high-COD wastewater is characterized by high salt content, complex composition, susceptibility to scaling and corrosion, and high concentrations of organic matter that are difficult to degrade. Conventional physicochemical and biochemical methods are often ineffective and energy-intensive. Supercritical water oxidation (SCWO), a novel technology for treating organic wastewater, is one of the effective solutions to this problem. Supercritical water oxidation operates above the critical point of water (P0). C =22.1MPa, T C Supercritical water (374℃) is a method of oxidizing organic matter by "combustion" using air or other oxidants under high temperature and pressure conditions. The polarity of water is a function of temperature and pressure, and supercritical water is a non-polar solvent. In a supercritical water environment, organic matter and gases are completely miscible, the gas-liquid interface disappears, forming a homogeneous system, and the reaction rate is greatly accelerated. Within a residence time of less than one minute or even a few seconds, more than 99.9% of the organic matter is rapidly combusted and oxidized into CO2, H2O, and other non-toxic and harmless end products.

[0004] Traditional supercritical water oxidation processes require preheating the waste liquid to the supercritical temperature to ensure the reaction starts. Due to the non-polar nature of supercritical water, inorganic salts tend to deposit under supercritical water conditions, easily adhering to pipes. This not only reduces the heat exchange characteristics of the preheater and heater but can even cause pipe blockage.

[0005] In supercritical reactors, the deposition and aggregation of inorganic salts can easily affect the degradation of organic matter, and the continuous discharge of inorganic salts is crucial for the safe operation of the reactor. Existing technologies use a salt discharge tank installed at the bottom of the reactor, allowing salt to fall into a storage tank at the bottom by gravity. However, viscous inorganic salts can easily clog the pipelines. Other techniques include intermittently opening valves and using the pressure difference between the reactor and the storage tank to discharge salt residue. However, this process requires manual intermittent operation, which is not only unreliable but also causes a sudden pressure drop of several megapascals during valve opening, lowering the reaction pressure below the supercritical pressure and affecting the reaction process and efficiency. Furthermore, while cooling and dissolving inorganic salts with cooling water can allow for rapid and stable discharge, the subsequent brine solution requires energy-intensive processes such as evaporation and concentration to reduce the brine volume, making it economically inefficient. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a supercritical water oxidation system for continuous discharge of salt residue, which addresses the above-mentioned shortcomings. The system of the present invention is used to solve the technical problems that inorganic salts are prone to deposition in the preheating stage, which affects the degradation efficiency in the reaction stage, and the lack of safe and reliable means for the discharge of salt residue.

[0007] To solve the above technical problems, the present invention adopts the following technical solution:

[0008] A supercritical water oxidation system with continuous salt discharge includes a reactor, a waste liquid branch, an oxygen branch, a product branch, and a salt discharge branch.

[0009] The reactor is provided with a reaction channel, a product channel and a separation zone. The product channel is located outside the reaction channel, and the separation zone is located below the reaction channel and the product channel. Both the reaction channel and the product channel are connected to the separation zone.

[0010] The waste liquid branch is used to preheat and pressurize the waste liquid, and to make the preheating temperature lower than the preset value, and then transport the preheated and pressurized waste liquid to the reaction channel.

[0011] The oxygen branch is used to pressurize oxygen, inputting a portion of the pressurized oxygen into the salt discharge branch, and mixing the other portion of the pressurized oxygen with preheated oxygen, and then conveying the mixture into the reaction channel.

[0012] The product branch is used to receive the low-density product separated from the product channel;

[0013] The salt discharge branch is used to discharge the salt residue at the bottom of the reactor into the salt discharge tank according to the differential pressure between the bottom of the reactor and the salt discharge tank, and to mix the salt residue and pressurized oxygen delivered from the oxygen branch in the salt discharge tank. After mixing, the pressure is reduced and gas-solid separation is performed, and the separated preheated oxygen is delivered to the oxygen branch.

[0014] Furthermore, the reactor includes an upper cylindrical section and a lower conical section. A cylindrical baffle is provided inside the upper cylindrical section. The top of the cylindrical baffle abuts against the top of the inner wall of the upper cylindrical section. The area inside the cylindrical baffle is a reaction channel. The area between the cylindrical baffle and the inner wall of the upper cylindrical section is a product channel. The area below the cylindrical baffle and between the lower conical section is a separation zone.

[0015] Furthermore, the waste liquid branch includes a waste liquid storage tank, a filter, a waste liquid booster pump, and a waste liquid heater connected in sequence, with the output end of the waste liquid heater connected to the top of the reaction channel.

[0016] Furthermore, the waste liquid branch also includes a temperature detector, which is used to detect the temperature of the waste liquid before it enters the reaction channel. The waste liquid booster pump is used to adjust the delivery flow rate according to the temperature data obtained from the temperature detector, and the waste liquid heater is used to adjust the heating temperature according to the temperature data obtained from the temperature detector.

[0017] Furthermore, the product branch includes a waste liquid preheater, a waste heat exchanger, a first back pressure valve, and a gas-liquid separator connected in sequence. The input end of the waste liquid preheater is connected to the top of the product channel. The waste liquid preheater is used to preheat the waste liquid in the waste liquid branch using the heat of the low-density product. The waste heat exchanger is used to heat the cooling water using the waste heat of the low-density product to generate steam.

[0018] Furthermore, the salt discharge branch includes a first control valve, a salt discharge tank, a second control valve, a pressure reducing valve, and a gas-solid separator. The first control valve, the salt discharge tank, the second control valve, and the pressure reducing valve are sequentially arranged between the salt discharge port of the reactor and the gas-solid separator. The first control valve is used to open or close the salt discharge port. The salt discharge tank is used to receive salt residue in the reactor. The oxygen branch is used to input pressurized oxygen into the salt discharge tank. The second control valve is used to open or close the output end of the salt discharge tank. The pressure reducing valve is used to reduce the pressure of the mixture of salt residue and oxygen before inputting it into the gas-solid separator. The gas outlet of the gas-solid separator is connected to the oxygen branch.

[0019] Furthermore, the salt discharge branch also includes a second back pressure valve and a salt storage tank. The input end of the second back pressure valve is connected to the solid outlet of the gas-solid separator, and the output end of the second back pressure valve is connected to the input end of the salt storage tank.

[0020] Furthermore, the oxygen branch includes an oxygen tank, an oxygen booster pump, and an ejector. The input end of the oxygen booster pump is connected to the output end of the oxygen tank, and the output end of the oxygen booster pump is connected to the ejector and the brine discharge tank respectively. A third control valve is provided between the oxygen booster pump and the brine discharge tank. The gas outlet of the gas-solid separator is connected to the ejector, and the output end of the ejector is connected to the top of the reaction channel.

[0021] Furthermore, the salt discharge branch also includes a differential pressure signal detector, which is used to detect the differential pressure between the bottom of the reactor and the salt discharge tank;

[0022] When the differential pressure value is less than the first preset value, the first control valve and the second control valve are open, and the third control valve is closed.

[0023] When the differential pressure value is less than or equal to the second preset value, the first control valve and the third control valve are closed, and the second control valve is opened.

[0024] When the differential pressure value is greater than or equal to the first preset value, the third control valve opens, and the first and second control valves close.

[0025] The first preset value is greater than the second preset value.

[0026] Furthermore, a one-way valve is provided between the gas outlet of the gas-solid separator and the ejector, the one-way valve being used to prevent gas in the ejector from flowing back into the gas-solid separator.

[0027] Compared with the prior art, the present invention, by adopting the above technical solution, has the following advantages:

[0028] The system of the present invention controls the preheating temperature of the waste liquid below the critical point (<360°C) to avoid deposition and blockage during the preheating process, and the heat required for insufficient reaction start-up is achieved by preheating oxygen.

[0029] The reaction setup of this invention uses a cylindrical baffle to separate the product channel and the reaction channel. Oxygen and waste liquid react in the reaction channel and flow downward to the bottom of the reactor, where gas-solid separation occurs to separate the low-density product and salt residue. The low-density product is discharged from the product outlet along the product channel and can subsequently be used as a heat source to heat the waste liquid and cooling water, thereby achieving preheating of the waste liquid and output of steam.

[0030] This invention controls the opening and closing of valves based on the differential pressure between the bottom of the reactor and the salt discharge tank, thereby safely and reliably discharging the salt residue accumulated at the bottom of the reactor, avoiding excessive pressure fluctuations that could affect the reaction process, and ensuring that the salt residue is always discharged in a dry state, thus maximizing the reduction of subsequent waste.

[0031] This invention introduces a portion of pressurized oxygen into the brine discharge tank. This serves two purposes: firstly, it regulates the pressure difference between the discharge tank and the bottom of the reactor; secondly, it mixes with the brine residue, utilizing the heat from the residue to preheat the oxygen, compensating for insufficient heat in preheating the waste liquid and ensuring efficient reaction within the reactor. Furthermore, this preheating efficiency is higher than that of a partitioned heat exchanger. In addition, this method enhances the degradation of organic matter in the brine residue through oxygen-enriched conditions, reducing the difficulty of subsequent brine residue disposal.

[0032] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Attached Figure Description

[0033] Figure 1 This is a diagram showing the overall structure of the system of the present invention;

[0034] Figure 2 This is a structural diagram of the reactor of the present invention.

[0035] The attached diagram lists the components represented by each number as follows:

[0036] 1. Reactor; 1a. Reaction channel; 1b. Product channel; 1c. Separation zone; 11. Upper cylindrical section; 12. Lower conical section; 13. Cylindrical baffle; 14. Salt outlet; 15. Oxygen inlet; 16. Waste liquid inlet; 17. Product outlet;

[0037] 21. Waste liquid storage tank; 22. Filter; 23. Waste liquid booster pump; 24. Waste liquid heater; 25. Temperature detector;

[0038] 31. Waste liquid preheater; 32. Waste heat exchanger; 33. First back pressure valve; 34. Gas-liquid separator; 35. Cooling water booster pump;

[0039] 41. First control valve; 42. Salt discharge tank; 43. Second control valve; 44. Pressure reducing valve; 45. Gas-solid separator; 46. Second back pressure valve; 47. Salt storage tank; 48. Differential pressure signal detector;

[0040] 51. Oxygen cylinder; 52. Oxygen booster pump; 53. Ejector; 54. Third control valve; 55. Check valve. Detailed Implementation

[0041] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0042] In the description of this invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "clockwise" and "counterclockwise" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0043] like Figure 1 As shown, a supercritical water oxidation system with continuous salt discharge includes a reactor 1, a waste liquid branch, an oxygen branch, a product branch, and a salt discharge branch.

[0044] The reactor 1 is provided with a reaction channel 1a, a product channel 1b and a separation zone 1c. The product channel 1b is located outside the reaction channel 1a, and the separation zone 1c is located below the reaction channel 1a and the product channel 1b. The reaction channel 1a and the product channel 1b are both connected to the separation zone 1c.

[0045] The waste liquid branch is used to preheat and pressurize the waste liquid, and to make the preheating temperature lower than the preset value, and then transport the preheated and pressurized waste liquid to the reaction channel 1a.

[0046] The oxygen branch is used to pressurize oxygen, input a portion of the pressurized oxygen into the salt discharge branch, and mix the other portion of the pressurized oxygen with preheated oxygen, and then transport the mixture into the reaction channel 1a.

[0047] The product branch is used to receive the low-density product separated in product channel 1b;

[0048] The salt discharge branch is used to discharge the salt residue at the bottom of reactor 1 into the salt discharge tank 42 according to the differential pressure between the bottom of reactor 1 and the salt discharge tank 42, and to mix the salt residue and the pressurized oxygen delivered by the oxygen branch in the salt discharge tank 42. After mixing, the pressure is reduced and gas-solid separation is performed, and the separated preheated oxygen is delivered to the oxygen branch.

[0049] Through the above technical solution:

[0050] High-pressure organic waste liquid enters the reactor through preheating and heating, but the preheating temperature is controlled below the critical point (<360℃) to avoid deposition and blockage during the preheating process.

[0051] After being pressurized, part of the oxygen enters the salt discharge tank, where it absorbs the high-temperature heat from the salt residue. Then, it mixes with another portion of the oxygen and enters the reactor to replenish the insufficient heat from the preheating of the waste liquid, thereby starting the reaction and ensuring its efficient operation.

[0052] The reactor is equipped with an inner cylinder for supercritical oxidation reaction, and gas-solid separation is carried out at the bottom of the reactor to separate the reaction products and salt residue. The products are discharged from the top of the reactor and subsequently used as a heat source to preheat waste liquid and generate steam for external output; the salt residue falls to the bottom of the reactor to be discharged.

[0053] A salt discharge tank is installed below the reactor. Partial oxygen injection balances the pressure difference between the lower part of the reactor and the salt discharge tank. Solenoid valves are installed above and below the salt discharge tank to control the flow of oxygen and salt residue via the pressure difference. Oxygen and high-temperature salt residue can be effectively mixed in the salt discharge tank, enhancing the degradation of residual organic matter in the salt residue and achieving efficient preheating of the residue itself.

[0054] like Figure 2 As shown, the reactor 1 includes an upper cylindrical section 11 and a lower conical section 12. A cylindrical baffle 13 is provided inside the upper cylindrical section 11. The top of the cylindrical baffle 13 abuts against the top of the inner wall of the upper cylindrical section 11. The area inside the cylindrical baffle 13 is the reaction channel 1a. The area between the cylindrical baffle 13 and the inner wall of the upper cylindrical section 11 is the product channel 1b. The area below the cylindrical baffle 13 and between the lower conical section 12 is the separation zone 1c.

[0055] The top of reactor 1 (i.e. the top of the upper cylindrical section 11) is provided with an oxygen inlet 15, a waste liquid inlet 16 and a product outlet 17. The oxygen inlet 15 and the waste liquid inlet 16 are connected to the top of the reaction channel 1a, and the product outlet 17 is connected to the top of the product channel 1b. The bottom of reactor 1 (i.e. the bottom of the lower conical section 12) is provided with a salt discharge port 14, which is connected to the bottom of the separation zone 1c.

[0056] The waste liquid branch includes a waste liquid storage tank 21, a filter 22, a waste liquid booster pump 23, a waste liquid preheater 31, and a waste liquid heater 24 connected in sequence. When the waste liquid passes through the filter 22, large insoluble particles in the waste liquid are removed. Then, the waste liquid is boosted to more than 23 MPa by the waste liquid booster pump 23. It is first preheated by the waste liquid preheater 31, then heated by the waste liquid heater 24, and finally fed into the reactor 1 through the waste liquid inlet 16.

[0057] Before entering reactor 1, the temperature of the waste liquid is detected by temperature detector 25. Based on the temperature value, the delivery flow rate of waste liquid booster pump 23 and the heating temperature of waste liquid heater 24 are adjusted to ensure that the temperature of the waste liquid entering reactor 1 is below 360°C. Generally, if the temperature of the waste liquid is too high, the delivery flow rate of waste liquid booster pump 23 is increased and the heating temperature of waste liquid heater 24 is decreased; if the temperature of the waste liquid is too low, the delivery flow rate of waste liquid booster pump 23 is decreased and the heating temperature of waste liquid heater 24 is increased.

[0058] The salt content of the waste liquid is 1-15%, and the organic matter concentration is 2-30%.

[0059] The oxygen branch includes an oxygen tank 51, an oxygen booster pump 52, and an ejector 53 arranged in sequence. The oxygen in the oxygen tank 51 is boosted by the oxygen booster pump 52. The pressure of the boosted oxygen is 1-5 MPa higher than the pressure of the boosted waste liquid. Part of the boosted oxygen enters the ejector 53, and the other part enters the brine tank 42 through the third control valve 54.

[0060] Inside ejector 53, pressurized oxygen is used as working fluid to draw in preheated oxygen discharged from gas-solid separator 45. The two streams of oxygen are mixed and discharged from ejector 53 and enter reactor 1 from oxygen inlet 15.

[0061] The oxygen flow rate is 1.2 to 1.5 times the amount of oxygen required for the complete oxidation of organic matter in the waste liquid.

[0062] Oxygen and waste liquid flow from top to bottom in reaction channel 1a to carry out supercritical water oxidation reaction. The reaction products undergo gas-solid separation in separation zone 1c. Salt residue falls to the bottom of separation zone 1c (i.e., the bottom of the lower conical section 12), while low-density products enter the product channel 1b upwards and are discharged from the product outlet 17 along the product channel 1b.

[0063] The product branch includes a waste liquid preheater 31, a waste heat exchanger 32, a first back pressure valve 33 and a gas-liquid separator 34 arranged in sequence. The waste liquid preheater 31 is used to receive the low-density product discharged from the product outlet 17 and use the heat of the low-density product to preheat the waste liquid.

[0064] It also includes a cooling water booster pump 35 connected to the waste heat exchanger 32. The cooling water booster pump 35 is used to connect to an external cooling water pipeline and pressurize the cooling water before inputting it into the waste heat exchanger 32. The waste heat exchanger 32 is used to utilize the waste heat of the low-density product to heat the pressurized cooling water in order to output steam.

[0065] After undergoing two heat exchanges, the low-density product is depressurized by the first back pressure valve 33 and then enters the gas-liquid separator 34. The gas-liquid product and the liquid product are separated and discharged separately by the gas-liquid separator 34.

[0066] The salt discharge branch includes a first control valve 41, a salt discharge tank 42, a second control valve 43, a pressure reducing valve 44, and a gas-solid separator 45 connected in sequence. The first control valve 41 is connected to the salt discharge port 14. After the first control valve 41 is opened, the salt residue at the bottom of the separation zone 1c (i.e., the bottom of the lower conical section 12) will enter the salt discharge tank 42. The salt residue and some pressurized oxygen are mixed in the salt discharge tank 42. The oxygen is preheated by the heat of the salt residue. After the second control valve 43 is opened, the mixture of salt residue and oxygen is depressurized by the pressure reducing valve 44 and enters the gas-solid separator 45. The preheated oxygen is discharged from the gas outlet of the gas-solid separator 45 and enters the ejector 7, while the salt residue is discharged from the solid outlet of the gas-solid separator 45. After being reduced to normal pressure by the second back pressure valve 46, it is stored in the salt storage tank 47.

[0067] During system operation, the differential pressure between the bottom of separation zone 1c (i.e., the bottom of the lower conical section 12) and the brine discharge tank 42 is detected by differential pressure signal detector 48, and the first control valve 41, the second control valve 43 and the third control valve 54 are controlled based on the differential pressure, as follows:

[0068] In the initial stage, the first control valve 41 and the second control valve 43 are closed, and the third control valve 54 is opened. Oxygen is continuously injected into the salt discharge tank 17, which gradually increases the pressure in the salt discharge tank 17 and gradually decreases the differential pressure.

[0069] When the differential pressure is less than 0.5 MPa, the first control valve 41 and the second control valve 43 open, the third control valve 54 closes, and the salt residue at the bottom of the separation zone 1c enters the salt discharge tank 42 through the salt discharge port 14, and the differential pressure continues to decrease.

[0070] When the differential pressure gradually decreases to 0.1 MPa, the first control valve 41 and the third control valve 54 close, the second control valve 43 opens, and the mixture of salt and oxygen enters the gas-solid separator 45 after being depressurized by the pressure reducing valve 44. At this time, the differential pressure gradually increases.

[0071] When the differential pressure rises to 0.5 MPa, the third control valve 54 opens, the first control valve 41 and the second control valve 53 close, salt residue continues to accumulate at the bottom of the separation zone 1c, oxygen is continuously injected into the salt discharge tank 17, and the differential pressure gradually decreases.

[0072] The above process is repeated to continuously remove salt residue and to use the heat from the salt residue to preheat oxygen.

[0073] The above description provides examples of the preferred embodiments of the present invention. Parts not detailed herein are common knowledge to those skilled in the art. The scope of protection of the present invention is determined by the claims. Any equivalent modifications based on the technical teachings of the present invention are also within the scope of protection of the present invention.

Claims

1. A supercritical water oxidation system for continuous salt slag discharge, characterized in that, Includes reactor (1), waste liquid branch, oxygen branch, product branch and salt discharge branch; The reactor (1) is provided with a reaction channel (1a), a product channel (1b) and a separation zone (1c). The product channel (1b) is located outside the reaction channel (1a), and the separation zone (1c) is located below the reaction channel (1a) and the product channel (1b). The reaction channel (1a) and the product channel (1b) are both connected to the separation zone (1c). The waste liquid branch is used to preheat and pressurize the waste liquid, and to make the preheating temperature lower than the preset value, and then transport the preheated and pressurized waste liquid to the reaction channel (1a). The oxygen branch is used to pressurize the oxygen, input a portion of the pressurized oxygen into the salt discharge branch, and mix the other portion of the pressurized oxygen with the preheated oxygen. After mixing, the mixture is transported to the reaction channel (1a). The product branch is used to receive the low-density product separated in the product channel (1b); The salt discharge branch is used to discharge the salt residue at the bottom of the reactor (1) into the salt discharge tank (42) according to the differential pressure between the bottom of the reactor (1) and the salt discharge tank (42), and to mix the salt residue and the pressurized oxygen delivered by the oxygen branch in the salt discharge tank (42). After mixing, the pressure is reduced and gas-solid separation is performed, and the separated preheated oxygen is delivered to the oxygen branch. The waste liquid branch includes a waste liquid storage tank (21), a filter (22), a waste liquid booster pump (23) and a waste liquid heater (24) connected in sequence, and the output end of the waste liquid heater (24) is connected to the top of the reaction channel (1a); The product branch includes a waste liquid preheater (31), a waste heat exchanger (32), a first back pressure valve (33), and a gas-liquid separator (34) connected in sequence. The input end of the waste liquid preheater (31) is connected to the top end of the product channel (1b). The waste liquid preheater (31) is used to preheat the waste liquid in the waste liquid branch by using the heat of the low-density product. The waste heat exchanger (32) is used to heat the cooling water by using the waste heat of the low-density product to generate steam. The salt discharge branch includes a first control valve (41), a salt discharge tank (42), a second control valve (43), a pressure reducing valve (44), and a gas-solid separator (45). The first control valve (41), the salt discharge tank (42), the second control valve (43), and the pressure reducing valve (44) are sequentially arranged between the salt discharge port (14) of the reactor (1) and the gas-solid separator (45). The first control valve (41) is used to open or close the salt discharge port (14). The salt discharge tank (42) is used to receive the salt residue in the reactor (1). The oxygen branch is used to input pressurized oxygen into the salt discharge tank (42). The second control valve (43) is used to open or close the output end of the salt discharge tank (42). The pressure reducing valve (44) is used to reduce the pressure of the mixture of salt residue and oxygen before inputting it into the gas-solid separator (45). The gas outlet of the gas-solid separator (45) is connected to the oxygen branch.

2. The supercritical water oxidation system for continuous salt slag discharge according to claim 1, characterized in that, The reactor (1) includes an upper cylindrical section (11) and a lower conical section (12). A cylindrical baffle (13) is provided inside the upper cylindrical section (11). The top of the cylindrical baffle (13) abuts against the top of the inner wall of the upper cylindrical section (11). The area inside the cylindrical baffle (13) is the reaction channel (1a). The area between the cylindrical baffle (13) and the inner wall of the upper cylindrical section (11) is the product channel (1b). The area below the cylindrical baffle (13) and between the lower conical section (12) is the separation zone (1c).

3. The supercritical water oxidation system for continuous salt slag discharge according to claim 1, characterized in that, The waste liquid branch also includes a temperature detector (25), which is used to detect the temperature of the waste liquid before it enters the reaction channel (1a). The waste liquid booster pump (23) is used to adjust the delivery flow rate according to the temperature data obtained by the temperature detector (25). The waste liquid heater (24) is used to adjust the heating temperature according to the temperature data obtained by the temperature detector (25).

4. The supercritical water oxidation system for continuous salt slag discharge according to claim 1, characterized in that, The salt discharge branch also includes a second back pressure valve (46) and a salt storage tank (47). The input end of the second back pressure valve (46) is connected to the solid outlet of the gas-solid separator (45), and the output end of the second back pressure valve (46) is connected to the input end of the salt storage tank (47).

5. The supercritical water oxidation system for continuous salt slag discharge according to claim 1, characterized in that, The oxygen branch includes an oxygen tank (51), an oxygen booster pump (52), and an ejector (53). The input end of the oxygen booster pump (52) is connected to the output end of the oxygen tank (51). The output end of the oxygen booster pump (52) is connected to the ejector (53) and the salt discharge tank (42) respectively. A third control valve (54) is provided between the oxygen booster pump (52) and the salt discharge tank (42). The gas outlet of the gas-solid separator (45) is connected to the ejector (53). The output end of the ejector (53) is connected to the top of the reaction channel (1a).

6. The supercritical water oxidation system for continuous salt slag discharge according to claim 5, characterized in that, The salt discharge branch also includes a differential pressure signal detector (48), which is used to detect the differential pressure between the bottom of the reactor (1) and the salt discharge tank (42); When the differential pressure value is less than the first preset value, the first control valve (41) and the second control valve (43) are opened, and the third control valve (54) is closed. When the differential pressure value is less than or equal to the second preset value, the first control valve (41) and the third control valve (54) are closed, and the second control valve (43) is opened. When the differential pressure value is greater than or equal to the first preset value, the third control valve (54) opens, and the first control valve (41) and the second control valve (43) close. The first preset value is greater than the second preset value.

7. The supercritical water oxidation system for continuous salt slag discharge according to claim 5, characterized in that, A one-way valve (55) is provided between the gas outlet of the gas-solid separator (45) and the ejector (53), and the one-way valve (55) is used to prevent the gas in the ejector (53) from flowing back to the gas-solid separator (45).

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