Supercritical continuous oxidation system for high-salinity and high-concentration organic wastewater

Abstract

The utility model belongs to the field of supercritical water oxidation, and provides a high-salinity high-concentration organic wastewater supercritical continuous oxidation system which comprises a feeding system, a reaction system, a salt discharging system, a cooling system and a control system. The material and an oxidant are pressurized, mixed and preheated and then enter a reaction system for reaction; a high-temperature product generated by reaction enters a cold water tank to be cooled after waste heat recovery; subcritical water is introduced into the subcritical saline water tank, precipitated salt enters the saline water flash tank in the form of subcritical saline water, solid salt is obtained, and flash high-temperature gas enters the cooling system to be cooled. Compared with other existing systems, the feeding system is prevented from being blocked by controlling the feeding preheating temperature and arranging the air pulse purge valve; by arranging the subcritical saline water tank and the saline water flash tank, continuous salt discharging of the system and blockage prevention of the discharging system are achieved, and meanwhile the temperature and pressure bearing requirements of a salt discharging valve and generation of strong saline water are greatly reduced; by adopting the carbon steel pressure-bearing wall lined with the nickel-based alloy, the corrosion prevention and cost reduction of the reactor are realized, and the electromagnetic heating efficiency is greatly improved. The utility model has wide popularization and application prospects.

Description

TECHNICAL FIELD

[0001] The utility model relates to high salt high concentration organic wastewater treatment field especially relates to a kind of high salt high concentration organic wastewater supercritical continuous oxidation system. BACKGROUND

[0002] Supercritical water oxidation technology (SCWO) is a kind of green and efficient advanced oxidation treatment technology, compared with traditional treatment method, supercritical water oxidation technology has the points such as high efficiency, reaction is thorough, product is pollution-free etc.. But the three big problems of plugging, corrosion, high cost have been restricting the development and industrialization process of the technology.Especially for the treatment of high salt high concentration organic wastewater, how to successfully and effectively solve the problems of plugging and salt discharge is a difficult problem to be solved.

[0003] Chinese invention patent with patent No.CN202410714380 discloses "a kind of supercritical water oxidation system of continuous salt discharge residue", and proposes the anti-plugging method that material preheating temperature is controlled below 360 DEG C, but salt precipitation and organic matter coking can still occur at the temperature;At the same time, the patent proposes the salt discharge mode that normal temperature oxygen is used to pressurize and cool the salt discharge buffer tank, which is easy to cause scratch and leakage of high-temperature salt discharge valve.Chinese invention patent with patent No.CN202111580643 discloses "a kind of supercritical water oxidation industrialization salt discharge method and system", and proposes the intermittent salt discharge mode that salt discharge buffer tank is alternately charged and depressurized, but the high-temperature salt discharge valve of the system is set too small pressure difference, which is easy to cause wall sticking of precipitated salt and plugging of salt discharge valve.

[0004] Chinese utility model patent with patent No.CN201621164542 proposes a kind of carbon steel, stainless steel and nickel-based alloy lining titanium pressure-bearing wall, but practical application finds that the corrosion resistance of titanium alloy is not as good as nickel-based alloy for high salt high concentration organic wastewater supercritical oxidation system, and the electromagnetic heating efficiency is greatly reduced when stainless steel and nickel-based alloy are used for pressure-bearing wall. UTILITY MODEL CONTENT

[0005] To solve the above problems, the utility model provides a kind of high salt high concentration organic wastewater supercritical continuous oxidation system.

[0006] The technical scheme of the utility model:

[0007] A kind of high salt high concentration organic wastewater supercritical continuous oxidation system, including feed system, reaction system, salt discharge system, cooling system and control system;

[0008] The feed system is composed of water tank, water valve, sewage tank, sewage valve, high-pressure feed pump, air compressor, buffer tank, air flow regulating valve, air flow meter, air pulse purging valve, jet mixer, waste heat preheater, electromagnetic preheater and connecting pipeline,

[0009] The clean water tank and the clean water valve are connected in series to form a clean water pipeline, the sewage tank and the sewage valve are connected in series to form a sewage pipeline, the clean water pipeline and the sewage pipeline are connected in parallel and connected with the inlet of the high-pressure feed pump, the air compressor, the buffer tank, the air flow regulating valve and the air flow meter are connected in series through pipelines, the air pulse purge valve is connected in parallel with the air flow regulating valve and the air flow meter to form a pulse purge pipeline, the liquid inlet of the jet mixer is connected with the outlet of the high-pressure feed pump through a pipeline, the gas inlet is connected with the outlet of the air flow meter and the outlet of the air pulse purge valve through pipelines respectively, the outlet of the jet mixer is connected with the inlet of the waste heat preheater tube through a pipeline, the outlet of the waste heat preheater tube is connected with the inlet of the electromagnetic preheater, and the outlet of the electromagnetic preheater is connected with the feed inlet of the reaction system through a pipeline;

[0010] The reaction system is composed of an upper end cover, an inner cylinder, a temperature measuring sleeve, a conical guide plate, an outer cylinder, a C-shaped sealing ring, a heat insulation layer, an electromagnetic heating coil, a bursting disc, a high-temperature fluid electric regulating outlet valve and a connecting pipeline,

[0011] The upper end cover is provided with a feed inlet, a temperature measuring port and a pressure relief port, and the feed inlet is located at the center of the upper end cover, the upper end of the inner cylinder is coaxially fixed on the upper end cover with the feed inlet, and the temperature measuring port and the pressure relief port are located in the inner cylinder, the upper end of the temperature measuring sleeve is welded on the upper end cover through the temperature measuring port, and the lower end is deep into the middle part of the inner cylinder, the lower end of the inner cylinder is installed with the conical guide plate, the lower end of the outer cylinder is provided with a salt discharge port, the upper part of the side wall of the outer cylinder is provided with a high-temperature fluid outlet, the outer cylinder is composed of a corrosion-resistant inner lining and a pressure-bearing wall, the C-shaped sealing ring is installed between the upper end cover and the outer cylinder and connected through bolts; the heat insulation layer is wrapped outside the outer cylinder, the electromagnetic heating coil is wound outside the heat insulation layer, the bursting disc is installed at the pressure relief port of the upper end cover, the high-temperature fluid outlet is connected with the tube inlet of the jacketed heat exchanger through a pipeline, the outlet of the jacketed heat exchanger is connected with the shell inlet of the waste heat preheater through a pipeline, the shell outlet of the waste heat preheater is connected with the inlet of the high-temperature fluid electric regulating outlet valve through a pipeline, and the outlet of the high-temperature fluid electric regulating outlet valve is connected with the high-temperature fluid inlet of the cooling tower of the cooling system through a pipeline; the salt discharge port is connected with the high-temperature salt discharge valve inlet of the salt discharge system;

[0012] The salt discharge system is composed of a high-temperature salt discharge valve, a subcritical brine tank, a low-temperature salt discharge valve, a brine flash tank, a cold water piston pump, a jacketed heat exchanger, an automatic pressure regulating valve and a connecting pipeline,

[0013] The high-temperature salt discharge valve, the subcritical brine tank and the low-temperature salt discharge valve are connected in sequence from top to bottom, the upper middle part of the side wall of the brine flash tank is provided with a subcritical brine inlet, the bottom end is provided with a solid salt outlet, and the top end is provided with a flash gas outlet, a flash defoaming layer is arranged between the subcritical brine inlet and the flash gas outlet in the brine flash tank, the inlet of the cold water piston pump is connected with the cold water tower of the cooling system through a pipeline, the outlet of the cold water piston pump is connected with the inlet of the shell side of the jacketed heat exchanger through a pipeline, the outlet of the shell side of the jacketed heat exchanger is connected with the subcritical water inlet of the side wall of the subcritical brine tank and the inlet of the automatic pressure regulating valve through pipelines respectively, the outlet of the automatic pressure regulating valve is connected with the cooling water inlet of the cooling tower of the cooling system through a pipeline, the outlet of the low-temperature salt discharge valve is connected with the subcritical brine inlet of the brine flash tank through a pipeline, and the flash gas outlet of the brine flash tank is connected with the high-temperature fluid inlet of the cooling tower of the cooling system through a pipeline.

[0014] The cooling system is composed of a cooling tower, a cold water tower, a fan, a circulating pump and connecting pipelines,

[0015] The upper middle part of the side wall of the cooling tower is provided with a cooling water inlet, the lower middle part of the side wall of the cooling tower is provided with a high-temperature fluid inlet, the top of the cooling tower is provided with a gas outlet, and the bottom of the cooling tower is provided with a cold water outlet, a cooling defoaming layer is arranged between the subcritical brine inlet and the flash gas outlet in the cooling tower, the inlet of the circulating pump is connected with the cold water tower through a pipeline, the outlet of the circulating pump is connected with the cooling water inlet of the cooling tower through a pipeline, the cold water outlet of the cooling tower is connected with the cold water tower through a pipeline, and the fan is located above the cold water tower.

[0016] The control system is composed of a control cabinet, sensors, actuators and signal transmission lines,

[0017] The sensors include a buffer tank pressure sensor, an air flow meter sensor, a preheating temperature sensor, a reaction temperature sensor, a reaction pressure sensor, a jacketed heat exchanger tube side outlet temperature sensor, a subcritical brine tank temperature sensor, a subcritical brine tank pressure sensor, a cooling tower temperature sensor and a cold water tower temperature sensor, the actuators include a clean water valve switch, a sewage valve switch, a high-pressure feed pump switch, an air compressor switch, an air flow regulating valve switch, an air pulse purging valve switch, an electromagnetic preheater switch, an electromagnetic heating coil switch, a high-temperature fluid electric regulating outlet valve switch, a high-temperature salt discharge valve switch, a low-temperature salt discharge valve switch, a cold water piston pump switch, a fan switch and a circulating pump switch, and the sensors and the actuators are connected with the control cabinet through signal transmission lines.

[0018] Preferably, in the feed system, the working pressure of the buffer tank is 28-30 MPa; the outlet temperature of the waste heat preheater and the electromagnetic preheater is 260-300 DEG C, and when the air feed flow starts to decrease due to slight blockage of the preheating pipeline, the air pulse purging valve is automatically opened to realize automatic pulse purging of the feed pipeline.

[0019] Preferably, the reaction system operating pressure is 22.5-25MPa, operating temperature is 500-600℃, and the peroxide coefficient is 1.2-1.5; the high-temperature fluid is cooled to below 300℃ by the jacketed heat exchanger; the anticorrosive inner lining layer of the outer cylinder is 2-6mm thick nickel-based alloy material, and the pressure-bearing wall adopts magnetic carbon steel material facilitating electromagnetic heating; the heat insulation layer is 10-30mm thick high-temperature aerogel material, and the C-shaped sealing ring adopts nickel-based alloy material.

[0020] Preferably, in the salt discharging system, the subcritical brine tank has a pressure of 10-15MPa and a temperature of 200-300℃, the brine flash tank has a flash pressure of normal pressure and a flash temperature of above 100℃, and the automatic pressure regulating valve has an opening pressure of 10-15MPa, that is, when the subcritical brine tank is pressurized to 10-15MPa, the automatic pressure regulating valve is automatically opened, and the outlet water of the jacketed heat exchanger is automatically introduced into the cooling tower of the cooling system for cooling and temperature reduction.

[0021] Preferably, in the cooling system, the cooling tower reduces the high-temperature fluid from the high-temperature fluid electrically regulated outlet valve and the flash gas from the brine flash tank to below 50℃, and the cooling tower reduces the circulating water to below 35℃ by the fan.

[0022] The utility model discloses the advantages are:

[0023] 1. The utility model discloses a material preheating temperature is controlled in 260-300 DEG C interval, and simultaneously alleviateed salt high-temperature precipitation and organic matter low-temperature coking caused pipeline blockage phenomenon, simultaneously, set up pulse purging pipeline, automatic pulse purging is carried out to the feed pipe, and the blockage problem of the feed system is thoroughly solved.

[0024] 2. Through setting up the subcritical brine tank of pressure 10-15MPa, temperature 200-300 DEG C, salt is discharged in the form of subcritical brine, thereby avoiding solid salt to valve wear, through setting up brine flash tank, subcritical brine can be flashed to get solid salt, and the subcritical brine tank reduces the temperature of salt discharging valve and the pressure difference of both sides.

[0025] 3. Through adopting the carbon steel pressure-bearing wall of inner lining nickel-based alloy, not only the anticorrosion of reactor is realized, but also the electromagnetic heating efficiency is greatly improved.

[0026] 4. Through optimizing the energy recovery process of whole system, the operation cost is reduced. The system preferably solves the blockage, corrosion and high-cost problem of high-salt high-concentration organic wastewater supercritical continuous oxidation system, and has wide popularization and application prospect. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 A supercritical continuous oxidation system for high-salinity, high-concentration organic wastewater.

[0028] Figure 2 A control system diagram.

[0029] Figure 3 A reaction system structure diagram.

[0030] Figure 4 A salt water flash tank structure diagram.

[0031] Figure 5 A cooling tank structure diagram.

[0032] In the above figure: 1-1, clean water tank; 1-2, clean water valve; 1-3, sewage tank; 1-4, sewage valve; 1-5, high-pressure feed pump; 1-6, air compressor; 1-7, buffer tank; 1-8, air flow regulating valve; 1-9, air flow meter; 1-10, air pulse purge valve; 1-11, jet mixer; 1-12, waste heat preheater; 1-13, electromagnetic preheater; 2-1, upper end cover; 2-1-1, feed inlet; 2-1-2, temperature measuring port; 2-1-3, pressure relief port; 2-2, inner cylinder; 2-3, temperature measuring sleeve; 2-4, conical guide plate; 2-5, outer cylinder; 2-5-1, salt discharge port; 2-5-2, high-temperature fluid outlet; 2-5-3, corrosion-resistant inner lining; 2-5-4, pressure-bearing wall; 2-6, C-shaped sealing ring; 2-7, thermal insulation layer; 2-8, electromagnetic heating coil; 2-9, bursting disc; 2-10, high-temperature fluid electrically adjusted outlet valve; 3-1, high-temperature salt discharge valve; 3-2, subcritical brine tank; 3-3, low-temperature salt discharge valve; 3-4, brine flash tank; 3-4-1, subcritical brine inlet; 3-4-2, solid salt outlet; 3-4-3, flash gas outlet; 3-4-4, flash defoaming layer; 3-5, cold water plunger pump; 3-6, jacket heat exchanger; 3-7, automatic pressure regulating valve; 4-1, cooling tower; 4-1-1, cooling water inlet; 4-1-2, high-temperature fluid inlet; 4-1-3, gas outlet; 4-1-4, cold water outlet; 4-1-5, cooling defoaming layer; 4-2, cold water tower; 4-3, fan; 4-4, circulating pump; 5-1, control cabinet; 5-2, sensor; 5-2-1, buffer tank pressure sensor; 5-2-2, preheating temperature sensor; 5-2-3, reaction temperature sensor; 5-2-4, reaction pressure sensor; 5-2-5, jacket heat exchanger tube side outlet temperature sensor; 5-2-6, subcritical brine tank temperature sensor; 5-2-7, subcritical brine tank pressure sensor; 5-2-8, cooling tower temperature sensor; 5-2-9, cold water tower temperature sensor; 5-3, actuator; 5-3-1, clean water valve switch; 5-3-2, sewage valve switch; 5-3-3, high-pressure feed pump switch; 5-3-4, air compressor switch; 5-3-5, air flow regulating valve switch; 5-3-6, air pulse purge valve switch; 5-3-7, electromagnetic preheater switch; 5-3-8, electromagnetic heating coil switch; 5-3-9, high-temperature fluid electrically adjusted outlet valve switch; 5-3-10, high-temperature salt discharge valve switch; 5-3-11, low-temperature salt discharge valve switch; 5-3-12, cold water plunger pump switch; 5-3-13, fan switch; 5-3-14, circulating pump switch. DETAILED DESCRIPTION

[0033] The utility model will be further explained in detail in connection with the drawings and specific embodiments below, the following embodiments are only to explain the above-mentioned purpose, features and advantages of the utility model more obviously and easily understand, and are not the limitation of the utility model:

[0034] First, start the fan (4-3) and circulating pump (5-1) to make cooling water start circulating.Start air compressor (1-6), and high-pressure air is introduced into buffer tank (1-7), and the pressure of buffer tank (1-7) is kept at 28-30MPa, air flow regulating valve (1-8) is opened, and high-pressure air is discharged from buffer tank (1-7);At the same time, open the clean water valve (1-2) to introduce clean water, and start the high-pressure feed pump (1-5) to provide pressure for the clean water.After high-pressure clean water and high-pressure air are fully mixed in the jet mixer (1-11), they pass through the tube side of the waste heat preheater (1-12) and the electromagnetic preheater (1-13) and then enter the reaction system (2).Start electromagnetic preheater (1-13) and electromagnetic heating coil (2-8) to heat and warm up the system, and control the system pressure in the range of 22.5-25MPa by adjusting the opening of high-temperature fluid electrically adjusted outlet valve (2-10).

[0035] Further, when the system temperature and pressure reach 500-600 DEG C and 22.5-25MPa respectively, close the clean water valve (1-2), and at the same time open the sewage valve (1-4), and convert the clean water feed to sewage feed.Sewage is pressurized to 22.5-25MPa by high-pressure feed pump (1-5), and is fully mixed with high-pressure air from buffer tank (1-7) in jet mixer (1-11), and then is heated to 260-300 DEG C by waste heat preheater (1-12) and electromagnetic preheater (1-13) and then enters reaction system (2) from the feed port (2-1-1) of the upper end cover (2-1).

[0036] Further, when the feed pipe is slightly blocked and the air feed flow starts to decrease, the air pulse purge valve (1-10) is automatically opened to realize automatic pulse purge of the feed pipe.

[0037] Further, the preheated material enters the reaction system (2), and under the action of electromagnetic heating coil (2-8), the temperature is further increased to 500-600 DEG C, and supercritical water oxidation reaction occurs in the inner cylinder (2-2), and CO2, H2O and N2, etc.High-temperature fluid is generated, and high-temperature salt is precipitated.

[0038] Further, the high-temperature fluid generated by the reaction is discharged from the high-temperature fluid outlet (2-5-2) of the outer cylinder (2-5), and then is cooled to below 300°C by the tube side of the jacketed heat exchanger (3-6), and then enters the tube side of the waste heat preheater (1-12) to exchange heat with the preheated material in the tube side, and finally is discharged from the reaction system (2) through the high-temperature fluid electric regulating outlet valve (2-10) and enters the cooling system (4).

[0039] Further, the cold water is lifted to 10-15 MPa by the cold water plunger pump (3-5), and then enters the shell side of the jacketed heat exchanger (3-6) to cool the high-temperature fluid in the tube side and raise its own temperature to 200-300°C. At this time, the cold water becomes subcritical water and enters the subcritical brine tank (3-2). When the subcritical brine tank (3-2) is full and the pressure is raised to 10-15 MPa, the automatic pressure regulating valve (3-7) is automatically opened, and the subcritical water directly enters the cooling tower (4-1) in the cooling system (4) for cooling.

[0040] Further, the high-temperature salt precipitated by the reaction falls to the lower end of the outer cylinder (2-5) by gravity and dissolves into the subcritical water there to form subcritical brine. When the salt is discharged, the high-temperature salt discharge valve (3-1) is first opened, and the subcritical brine enters the subcritical brine tank (3-2) under the action of the pressure difference; then the high-temperature salt discharge valve (3-1) is completely closed, and the low-temperature salt discharge valve (3-3) is opened, and the subcritical brine enters the brine flash tank (3-2) under the action of the pressure difference, and solid salt is obtained by flashing, and the high-temperature gas is discharged from the flash gas outlet (3-4-3) to enter the cooling tower (4-1) of the cooling system (4); finally the low-temperature salt discharge valve is closed. The above steps are repeated to discharge the salt.

[0041] Further, the circulating cooling water enters the cooling tower (4-1) from the cold water tower (4-2) under the action of the circulating pump (4-4), cools the high-temperature fluid discharged from the reaction system (2) and the flash gas from the brine flash tank (3-4) to below 50°C, and then is transported back to the cold water tower (4-2) and releases non-condensable gas. The circulating cooling water in the cold water tower (4-2) is cooled to below 35°C by the fan (4-3).

Claims

1. A supercritical continuous oxidation system for high-salinity, high-strength organic wastewater, characterized in that: It comprises a feeding system (1), a reaction system (2), a salt discharge system (3), a cooling system (4) and a control system (5); The feeding system (1) is composed of a clean water tank (1-1), a clean water valve (1-2), a sewage tank (1-3), a sewage valve (1-4), a high-pressure feeding pump (1-5), an air compressor (1-6), a buffer tank (1-7), an air flow regulating valve (1-8), an air flow meter (1-9), an air pulse purge valve (1-10), a jet mixer (1-11), a waste heat preheater (1-12), an electromagnetic preheater (1-13) and connecting pipelines, The clean water tank (1-1) and the clean water valve (1-2) are connected in series to form a clean water pipeline, the sewage tank (1-3) and the sewage valve (1-4) are connected in series to form a sewage pipeline, the clean water pipeline and the sewage pipeline are connected in parallel with the inlet of the high-pressure feeding pump (1-5), the air compressor (1-6), the buffer tank (1-7), the air flow regulating valve (1-8) and the air flow meter (1-9) are connected in series through pipelines, the air pulse purge valve (1-10) is connected in parallel with the air flow regulating valve (1-8) and the air flow meter (1-9) to form a pulse purge pipeline, the liquid inlet of the jet mixer (1-11) is connected with the outlet of the high-pressure feeding pump (1-5) through a pipeline, the gas inlet is connected with the outlet of the air flow meter (1-9) and the outlet of the air pulse purge valve (1-10) through pipelines, the outlet of the jet mixer (1-11) is connected with the inlet of the tube pass of the waste heat preheater (1-12) through a pipeline, the outlet of the waste heat preheater (1-12) is connected with the inlet of the electromagnetic preheater (1-13), and the outlet of the electromagnetic preheater (1-13) is connected with the feeding port (2-1-1) of the reaction system (2) through a pipeline; The reaction system (2) is composed of an upper end cover (2-1), an inner cylinder (2-2), a temperature measuring sleeve (2-3), a conical guide plate (2-4), an outer cylinder (2-5), a C-shaped sealing ring (2-6), an insulation layer (2-7), an electromagnetic heating coil (2-8), a bursting disc (2-9), a high-temperature fluid electric regulating outlet valve (2-10) and connecting pipelines, The upper end cover (2-1) is provided with a feed inlet (2-1-1), a temperature measuring port (2-1-2) and a pressure relief port (2-1-3), and the feed inlet (2-1-1) is located at the center of the upper end cover (2-1), the inner cylinder (2-2) is coaxially fixed on the upper end cover (2-1) at the upper end, and the temperature measuring sleeve (2-3) is welded on the upper end cover (2-1) at the upper end through the temperature measuring port (2-1-2) and extends into the middle part of the inner cylinder (2-2) at the lower end, the conical guide plate (2-4) is installed at the lower end of the inner cylinder (2-2), the outer cylinder (2-5) is provided with a salt discharge port (2-5-1) at the lower end, the outer cylinder (2-5) is composed of a corrosion-resistant inner lining layer (2-5-3) and a pressure-bearing wall (2-5-4), a C-shaped sealing ring (2-6) is installed between the upper end cover (2-1) and the outer cylinder (2-5) and connected by bolts, the heat insulation layer (2-7) is wrapped outside the outer cylinder (2-5), the electromagnetic heating coil (2-8) is wound outside the heat insulation layer (2-7), the bursting disc (2-9) is installed at the pressure relief port (2-1-3) of the upper end cover (2-1), the high-temperature fluid outlet (2-5-2) is connected with the tube side inlet of the jacketed heat exchanger (3-6) through a pipeline, the outlet of the jacketed heat exchanger (3-6) is connected with the shell side inlet of the waste heat preheater (1-12) through a pipeline, the shell side outlet of the waste heat preheater (1-12) is connected with the inlet of the high-temperature fluid electric regulating outlet valve (2-10) through a pipeline, the outlet of the high-temperature fluid electric regulating outlet valve (2-10) is connected with the high-temperature fluid inlet (4-1-2) of the cooling tower (4-1) of the cooling system (4) through a pipeline, and the salt discharge port (2-5-1) is connected with the inlet of the high-temperature salt discharge valve (3-1) of the salt discharge system (3); The salt discharge system (3) is composed of a high-temperature salt discharge valve (3-1), a subcritical brine tank (3-2), a low-temperature salt discharge valve (3-3), a brine flash tank (3-4), a cold water piston pump (3-5), a jacketed heat exchanger (3-6), an automatic pressure regulating valve (3-7) and connecting pipelines, The high-temperature salt discharge valve (3-1), the subcritical brine tank (3-2), and the low-temperature salt discharge valve (3-3) are sequentially connected from top to bottom, the subcritical brine inlet (3-4-1) is arranged in the upper part of the side wall of the brine flash tank (3-4), the solid salt outlet (3-4-2) is arranged at the bottom end of the brine flash tank (3-4), the flash gas outlet (3-4-3) is arranged at the top end of the brine flash tank (3-4), the flash defoaming layer (3-4-4) is arranged between the subcritical brine inlet (3-4-1) and the flash gas outlet (3-4-3) in the brine flash tank (3-4), the inlet of the cold water plunger pump (3-5) is connected with the cold water tower (4-2) of the cooling system (4) through a pipeline, the outlet of the cold water plunger pump (3-5) is connected with the shell side inlet of the jacketed heat exchanger (3-6) through a pipeline, the shell side outlet of the jacketed heat exchanger (3-6) is connected with the subcritical water inlet of the side wall of the subcritical brine tank (3-2) and the inlet of the automatic pressure regulating valve (3-7) through pipelines, the outlet of the automatic pressure regulating valve (3-7) is connected with the cooling water inlet (4-1-1) of the cooling tower (4-1) of the cooling system (4) through a pipeline, the outlet of the low-temperature salt discharge valve (3-3) is connected with the subcritical brine inlet (3-4-1) of the brine flash tank (3-4) through a pipeline, and the flash gas outlet (3-4-3) of the brine flash tank (3-4) is connected with the high-temperature fluid inlet (4-1-2) of the cooling tower (4-1) of the cooling system (4) through a pipeline. The cooling system (4) is composed of a cooling tower (4-1), a cold water tower (4-2), a fan (4-3), a circulating pump (4-4), and connecting pipelines, The cooling tower (4-1) is provided with the cooling water inlet (4-1-1) in the upper part of the side wall, the high-temperature fluid inlet (4-1-2) in the lower part of the side wall, the gas outlet (4-1-3) at the top, and the cold water outlet (4-1-4) at the bottom, and the cooling defoaming layer (4-1-5) is arranged between the subcritical brine inlet (3-4-1) and the flash gas outlet (3-4-3) in the cooling tower (4-1), the inlet of the circulating pump (4-4) is connected with the cold water tower (4-2) through a pipeline, the outlet of the circulating pump (4-4) is connected with the cooling water inlet (4-1-1) of the cooling tower (4-1) through a pipeline, the cold water outlet (4-1-4) of the cooling tower (4-1) is connected with the cold water tower (4-2) through a pipeline, and the fan (4-3) is located above the cold water tower (4-2); The control system (5) is composed of a control cabinet (5-1), a sensor (5-2), an actuator (5-3), and a signal transmission line, The sensor (5-2) includes a buffer tank pressure sensor (5-2-1), an air flow meter sensor (5-2-2), a preheating temperature sensor (5-2-3), a reaction temperature sensor (5-2-4), a reaction pressure sensor (5-2-5), a jacket heat exchanger tube outlet temperature sensor (5-2-6), a subcritical brine tank temperature sensor (5-2-7), a subcritical brine tank pressure sensor (5-2-8), a cooling tower temperature sensor (5-2-9), a cold water tower temperature sensor (5-2-10), the actuator (5-3) includes a clear water valve (1-2) switch (5-3-1), a sewage valve (1-4) switch (5-3-2), a high-pressure feed pump (1-5) switch (5-3-3), an air compressor (1-6) switch (5-3-4), an air flow regulating valve (1-8) switch (5-3-5), an air pulse purge valve (1-10) switch (5-3-6), an electromagnetic preheater (1-13) switch (5-3-7), an electromagnetic heating coil (2-8) switch (5-3-8), a high-temperature fluid electrically adjusted outlet valve (2-10) switch (5-3-9), a high-temperature salt discharge valve (3-1) switch (5-3-10), a low-temperature salt discharge valve (3-3) switch (5-3-11), a cold water plunger pump (3-5) switch (5-3-12), a fan (4-3) switch (5-3-13), a circulating pump (4-4) switch (5-3-14), the sensor (5-2) and the actuator (5-3) are connected with the control cabinet (5-1) through signal transmission lines.

2. The supercritical continuous oxidation system for high-salinity and high-concentration organic wastewater according to claim 1, characterized in that: The working pressure of the buffer tank (1-7) is 28-30 MPa; the outlet temperature of the waste heat preheater (1-12) and the electromagnetic preheater (1-13) is 260-300 ℃, and when the air feed flow starts to decrease due to slight blockage of the preheating pipeline, the air pulse purge valve (1-10) is automatically opened to realize automatic pulse purge of the feed pipeline.

3. The supercritical continuous oxidation system for high-salinity and high-concentration organic wastewater according to claim 1, characterized in that: The working pressure is 22.5-25 MPa, the working temperature is 500-600 ℃, and the peroxide coefficient is 1.2-1.5; the high-temperature fluid is cooled to below 300 ℃ by the jacket heat exchanger (3-6); the anticorrosion inner lining layer (2-5-3) of the outer cylinder (2-5) is 2-6 mm thick nickel-based alloy material, and the pressure-bearing wall (2-5-4) is made of magnetic carbon steel material which is easy to be electromagnetically heated; the heat insulation layer (2-7) is 10-30 mm thick high-temperature gas aerogel material, and the C-shaped sealing ring (2-6) is made of nickel-based alloy material.

4. The supercritical continuous oxidation system for high-salinity and high-concentration organic wastewater according to claim 1, characterized in that: The subcritical brine tank (3-2) has a pressure of 10-15 MPa and a temperature of 200-300 ℃, the brine flash tank (3-4) has a flash pressure of normal pressure and a flash temperature of above 100 ℃, and the automatic pressure regulating valve (3-7) has an opening pressure of 10-15 MPa, that is, when the subcritical brine tank (3-2) is pressurized to 10-15 MPa, the automatic pressure regulating valve (3-7) is automatically opened, and the outlet water of the jacketed heat exchanger (3-6) automatically enters the cooling tower (4-1) in the cooling system (4) for cooling and temperature reduction.

5. The supercritical continuous oxidation system for high-salinity and high-concentration organic wastewater according to claim 1, characterized in that: The cooling tower (4-1) reduces the temperature of the high-temperature fluid from the high-temperature fluid electrically regulated outlet valve (2-10) and the flash gas from the brine flash tank (3-4) to below 50 ℃, and the cooling water tower (4-2) reduces the circulating water to below 35 ℃ by the fan (4-3).

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