Supercritical water oxidation device

Abstract

The utility model relates to the field of supercritical water oxidation reaction, in particular to a supercritical water oxidation device which comprises a feeding system, a preheating system, a reaction system, a salt discharging system and a cooling system, a gas pipeline and a liquid pipeline of the feeding system are respectively communicated with a waste heat preheater of the preheating system through a jet mixer, an electromagnetic preheater of the preheating system is communicated with a feeding hole of the reaction system through a feeding pipeline, and a high-temperature fluid outlet of the reaction system is communicated with the waste heat preheater of the preheating system through a return pipeline; a discharge hole of the reaction system is communicated with a subcritical salt water tank of the salt discharging system through a salt water inlet pipeline; and a salt water flash tank of the salt discharging system is communicated with a cooling tower of the cooling system. The device has the advantages of high efficiency, environmental protection, high resource utilization rate and simplicity and convenience in operation.

Description

Technical Field

[0001] This utility model relates to the field of supercritical water oxidation reaction, specifically to a device for precipitating salt from supercritical water through an oxidation reaction. Background Technology

[0002] Wastewater cannot be directly treated using evaporation methods because it is difficult to meet environmental protection requirements. Furthermore, evaporation requires a large amount of heat energy to evaporate water, resulting in high energy consumption and costs. In addition, commonly used membrane separation salt production technology also has the following disadvantages: it has high requirements for water quality; otherwise, the membrane is easily clogged by impurities, requiring frequent cleaning or replacement, leading to low efficiency. Utility Model Content

[0003] The purpose of this invention is to provide a supercritical water oxidation device, which is a device for salt production by supercritical water oxidation with high reaction efficiency and high resource utilization.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] A supercritical water oxidation device includes a feeding system, a preheating system, a reaction system, a desalination system, and a cooling system. The gas pipeline and liquid pipeline of the feeding system are respectively connected to the waste heat preheater of the preheating system through a jet mixer. The electromagnetic preheater of the preheating system is connected to the feed inlet of the reaction system through a feed pipeline. The high-temperature fluid outlet of the reaction system is connected to the waste heat preheater of the preheating system through a return pipeline. The discharge outlet of the reaction system is connected to the subcritical brine tank of the desalination system through a brine inlet pipeline. The brine flash tank of the desalination system is connected to the cooling tower of the cooling system.

[0006] Furthermore, the jet mixer includes a gas inlet, a liquid inlet, and a mixing outlet; the gas pipeline is connected to the gas inlet, the liquid pipeline is connected to the liquid inlet, and the mixing outlet is connected to the waste heat preheater of the preheating system.

[0007] Furthermore, the gas pipeline includes a main gas pipeline, a first gas pipeline branch, and a second gas pipeline branch. The end of the main gas pipeline and the beginnings of the first and second gas pipeline branches are connected. The ends of the first and second gas pipeline branches are connected to a gas inlet. An air compressor and a buffer tank are provided on the main gas pipeline. An air flow regulating valve and an air flow meter are provided on the first gas pipeline branch. An air pulse purging valve is provided on the second gas pipeline branch.

[0008] Furthermore, the liquid pipeline is divided into a clean water branch, a sewage branch, and a main liquid pipeline. The clean water branch and the sewage branch are connected to the liquid inlet through the main liquid pipeline. The clean water branch is connected to a clean water tank at its starting end and is equipped with a clean water valve. The sewage branch is connected to a sewage tank at its starting end and is equipped with a sewage valve. The main liquid pipeline is equipped with a feed pump.

[0009] Furthermore, a shell-and-tube heat exchanger is provided on the return material pipeline.

[0010] Furthermore, the reaction system includes a reaction vessel and a rupture disc. The reaction vessel is provided with an insulation layer and an electromagnetic heating coil on its outer side, and the rupture disc is located at the upper end of the reaction vessel. The reaction vessel includes an upper end cover, an outer cylinder and an inner cylinder. The upper end cover is adapted to the outer cylinder, and the inner cylinder is disposed in the cavity of the outer cylinder.

[0011] Furthermore, the upper end cover is provided with a sealing ring for sealing the gap between the upper end cover and the outer cylinder, the feed port is opened at the top of the upper end cover and communicates with the inner cylinder, the discharge port is located at the bottom of the outer cylinder, and the high-temperature fluid outlet is located on the side wall of the outer cylinder; a conical guide plate is provided above the discharge port.

[0012] Furthermore, the subcritical brine tank is connected to the brine flash tank via a brine outlet pipe. A high-temperature brine discharge valve is installed on the brine inlet pipe, and a low-temperature brine discharge valve is installed on the brine outlet pipe. The subcritical brine tank is connected to the cooling tower and the chilled water tower of the cooling system, respectively. The brine flash tank is equipped with a brine discharge port, a flash gas outlet, and a subcritical brine inlet. The subcritical brine inlet is connected to the brine outlet pipe, and the flash gas outlet is connected to the cooling tower of the cooling system. The brine discharge port discharges the salt.

[0013] Furthermore, the cooling system includes a fan, and the cooling tower is connected to the cooling water tower via a condensate pipe, with the fan installed in the cooling water tower; the cooling tower is connected to the waste heat preheater of the preheating system via a first air inlet branch, to the flash gas outlet via a second air inlet branch, and to the subcritical brine tank via a water inlet branch; the first air inlet branch is equipped with a high-temperature fluid electric regulating outlet valve, and the water inlet branch is equipped with an automatic pressure regulating valve.

[0014] Furthermore, the cooling tower is connected to the cooling tower via a first cooling branch and to the subcritical brine tank via a second cooling branch, the second cooling branch passing through a shell-and-tube heat exchanger; a circulation pump is provided on the first cooling branch and a cold water plunger pump is provided on the second cooling branch.

[0015] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0016] This device first preheats the wastewater before introducing it into the reaction system for supercritical water oxidation, significantly increasing the reaction rate and shortening the salt production time. After salt precipitation, excess high-temperature gas is sent to a cooling system for cooling before being discharged. The supercritical water oxidation process produces no harmful byproducts, reducing environmental pollution and meeting green chemistry requirements. This invention offers advantages such as high efficiency, environmental friendliness, high resource utilization, and ease of operation. Attached Figure Description

[0017] Figure 1 This is a flow chart of a supercritical water oxidation device.

[0018] Figure 2 This is a flowchart of the feeding system.

[0019] Figure 3 This is a flow chart of the reaction system. Detailed Implementation

[0020] like Figure 1 As shown, a supercritical water oxidation device includes a feeding system 1, a preheating system 2, a reaction system 3, a salt discharge system 4, and a cooling system 5. The gas pipeline 11 and the liquid pipeline 12 of the feeding system 1 are respectively connected to the waste heat preheater 21 of the preheating system 2 through a jet mixer 6. The electromagnetic preheater 22 of the preheating system 2 is connected to the feed inlet 316 of the reaction system 3 through a feed pipeline 221. The high-temperature fluid outlet 312-2 of the reaction system 3 is connected to the waste heat preheater 21 of the preheating system 2 through a return pipeline 211. The discharge outlet 312-1 of the reaction system 3 is connected to the subcritical brine tank 42 of the salt discharge system 4 through a brine inlet pipeline. The brine flash evaporator 44 of the salt discharge system 4 is connected to the cooling tower 51 of the cooling system 5. The feeding system 1 sends the material to the waste heat preheater 21 and electromagnetic preheater 22 in the preheating system 2 for preheating. The material then enters the reaction system 3 through the feed pipe 221 for oxidation. The reaction system 3 produces high-temperature fluid and high-temperature salt. The high-temperature salt falls into the subcritical brine tank 42 of the salt discharge system 4 by gravity. The high-temperature fluid enters the waste heat preheater 21 of the preheating system 2 through the return pipe 211 to preheat new material, fully utilizing the residual temperature of the high-temperature fluid. It then enters the cooling tower 51 of the cooling system 5 for cooling. The salt discharge system 4 dissolves the high-temperature salt in subcritical water to form subcritical brine, which is then flash-evaporated in the brine flash tank 44 to obtain solid salt. The generated high-temperature gas enters the cooling system 5 for cooling.

[0021] like Figure 2As shown, the jet mixer 6 includes a gas inlet, a liquid inlet, and a mixing outlet; the gas pipeline 11 is connected to the gas inlet, the liquid pipeline 12 is connected to the liquid inlet, and the mixing outlet is connected to the preheating system 2. The jet mixer 6 can fully mix the materials, and after mixing, the jet mixer 6 conveys the mixed materials through the mixing outlet to the waste heat preheater 21 and the electromagnetic preheater 22 for heating.

[0022] The gas pipeline 11 includes a main gas pipeline 111, a first gas pipeline branch 112, and a second gas pipeline branch 113. The end of the main gas pipeline 111 and the beginnings of the first and second gas pipeline branches 112 and 113 are connected. The ends of the first and second gas pipeline branches 112 and 113 are connected to a gas inlet. An air compressor 111-1 and a buffer tank 111-2 are provided on the main gas pipeline 111. An air flow regulating valve 112-1 and an air flow meter 112-2 are provided on the first gas pipeline branch 112. An air pulse purging valve 113-1 is provided on the second gas pipeline branch 113. Air compressor 111-1 introduces air into buffer tank 111-2. Buffer tank 111-2 is equipped with a first pressure gauge to keep the pressure in buffer tank 111-2 within the range of 28 to 30 MPa. After the pressure stabilizes, air flow regulating valve 112-1 is opened to allow high-pressure air to enter the waste heat preheater for heating. Air flow meter 112-2 can observe the actual air flow.

[0023] The liquid pipeline 12 is divided into a clean water branch 121, a sewage branch 122, and a main liquid pipeline 123. The clean water branch 121 and the sewage branch 122 are connected to the liquid inlet through the main liquid pipeline 123. The starting end of the clean water branch 121 is connected to a clean water tank 121-1, and a clean water valve 121-2 is installed on the clean water branch 121. The starting end of the sewage branch 122 is connected to a sewage tank 122-1, and a sewage valve 122-2 is installed on the sewage branch 122. The main liquid pipeline 123 is equipped with a feed pump 123-1. The feed pump 123-1 allows clean water or sewage to enter the jet mixer 6, and then the jet mixer 6 thoroughly mixes the air with the clean water or sewage. Finally, the mixture is transported to the waste heat preheater 21 through the jet mixer 6.

[0024] The feed pipe 221 is equipped with a first thermometer for monitoring the temperature of the material in the electromagnetic preheater 22, and the return pipe 211 is equipped with a fourth thermometer; the return pipe 211 is equipped with a shell-and-tube heat exchanger 7, which can effectively exchange heat with the high-temperature fluid generated in the reaction system 3.

[0025] like Figure 3As shown, the reaction system 3 includes a reaction vessel 31 and a rupture disc 32. The outer side of the reaction vessel 31 is provided with an insulation layer 33 and an electromagnetic heating coil 34. The rupture disc 32 is located at the upper end of the reaction vessel 31, effectively preventing the reaction vessel 31 from malfunctioning due to excessive pressure. A pressure relief port is provided on the reaction vessel 31 to prevent excessive pressure. The reaction vessel 31 is also equipped with a corrosion-resistant inner lining and a pressure-bearing wall. The corrosion-resistant inner lining prevents corrosion and effectively extends the service life of the reaction vessel 31, while the pressure-bearing wall increases the load-bearing capacity of the reaction vessel 31. A gas outlet valve for regulating pressure is also provided inside the reaction vessel 31. The reaction vessel 31 includes an upper end cover 311, an outer cylinder 312, and an inner cylinder 313. The upper end cover 311 is adapted to the outer cylinder 312, and the inner cylinder 313 is located within the cavity of the outer cylinder 312. A temperature measuring sleeve 314 is provided on the inner cylinder 313, and the temperature measuring sleeve 314 is connected to a second thermometer. The upper end cover 311 is provided with a sealing ring 315 for sealing the gap between the upper end cover 311 and the outer cylinder 312. The sealing ring 315 is a C-type sealing ring, which can effectively ensure the temperature in the inner cylinder 313. The feed inlet 316 is opened at the top of the upper end cover 311 and is connected to the inner cylinder 313. The outer cylinder 312 has a discharge port 312-1 and a high-temperature fluid outlet 312-2. The discharge port 312-1 is located at the bottom of the outer cylinder 312, and the high-temperature fluid outlet 312-2 is located on the side wall of the outer cylinder 312. A conical guide plate 317 is provided above the discharge port 312-1. The discharge port 312-1 is connected to the subcritical brine tank 42 of the salt discharge system 4. The high-temperature fluid outlet 312-2 is connected to the waste heat preheater 21 through the return pipe 211. The return pipe 211 passes through the shell-and-tube heat exchanger 7. A second pressure gauge and a fourth temperature gauge are provided on the return pipe 211.

[0026] The subcritical brine tank 42 is connected to the brine flash tank 44 via a brine outlet pipe. A high-temperature discharge valve 41 is installed on the brine inlet pipe, and a low-temperature discharge valve 43 is installed on the brine outlet pipe. The subcritical brine tank 42 is connected to the cooling tower 51 and the cold water tower 52 of the cooling system 4. A third pressure gauge and a third temperature gauge are installed on the subcritical brine tank 42. The brine flash tank 44 has a salt discharge port 441, a flash gas outlet 442, and a subcritical brine inlet 443. The subcritical brine inlet 443 is connected to the brine outlet pipe, and the flash gas outlet 442 is connected to the cooling tower 51 of the cooling system 5. The salt discharge port 441 discharges salt. The high-temperature discharge valve 41 allows subcritical brine to enter the subcritical brine tank 42 under pressure difference, and the low-temperature discharge valve 43 allows subcritical brine to enter the brine flash tank 44 under pressure difference. The brine flash tank 44 produces solid salt and flash gas. The solid salt is discharged from the salt outlet 441, and the flash gas enters the cooling tower 51 through the flash gas outlet 442 for cooling.

[0027] The cooling system 5 includes a cooling tower 51, a cooling water tower 52, and a fan 53. The cooling tower 51 is connected to the cooling water tower 52 via a condensate pipe. The fan 53 is installed in the cooling water tower 52. The cooling tower 51 is connected to a fifth thermometer, and the cooling water tower 52 is connected to a sixth thermometer. The cooling tower 51 is connected to the waste heat preheater 21 via a first air inlet branch 511, to the flash gas outlet 442 via a second air inlet branch 512, and to the subcritical brine tank 42 via a water inlet branch 513. The first air inlet branch 511 is equipped with a high-temperature fluid electric regulating outlet valve 514, and the water inlet branch 513 is equipped with an automatic pressure regulating valve 515. The automatic pressure regulating valve 515 can regulate the pressure in the subcritical brine tank 42. The subcritical water in the subcritical brine tank 42 in the initial stage will enter the cooling tower 51 through the water inlet branch 513 for cooling. The cooling tower 52 is connected to the cooling tower 51 through the first cooling branch 521 and to the shell-and-tube heat exchanger 7 through the second cooling branch 522; the first cooling branch 521 is equipped with a circulating pump 521-1 and the second cooling branch 522 is equipped with a cold water plunger pump 522-1.

[0028] Operating procedures:

[0029] I. Power-on process

[0030] 1. Start the fan 53 and the circulating pump 521-1 to start circulating the cooling water.

[0031] 2. Start the air compressor 111-1 to pump air into the buffer tank 111-2, and maintain the pressure in the buffer tank 111-2 within the range of 28 to 30 MPa. After the pressure in the buffer tank 111-2 stabilizes, the air flow regulating valve 112-1 begins to introduce high-pressure air. Start the electromagnetic preheater 22 and electromagnetic heating coil 34 to heat the system and automatically regulate the temperature.

[0032] 3. Start the cold water plunger pump 522-1 to pressurize the cold water to 10 to 15 MPa. Then, the cold water enters the subcritical brine tank 42 after passing through the second cooling branch 511 and the shell-and-tube heat exchanger 7 to increase its temperature. When the subcritical brine tank 42 is full and pressurized to 10 to 15 MPa, the automatic pressure regulating valve 515 automatically opens, and the subcritical water directly enters the cooling tower 51 for cooling through the inlet branch 513 under the action of the automatic pressure regulating valve 515.

[0033] 4. When the temperature of reaction vessel 31 reaches 100℃, open the clean water valve 121-2 and the feed pump 123-1 to slowly inject clean water into the system. By adjusting the water and air flow rates of the injection system, the pressure and temperature of reaction vessel 31 are gradually increased to the set values, which are 23 to 25 MPa and 400 to 600℃ respectively. During this period, the heating rate is controlled to be no more than 50℃ every ten minutes. The pressure of reaction vessel 31 can be maintained at 23 to 25 MPa by adjusting the gas outlet valve of the reaction vessel. The electromagnetic heating coil switch is related to the temperature of reaction vessel 31. It is closed when the set temperature is reached and opened when the temperature is lower than the set value.

[0034] 5. When the temperature and pressure of the reaction tank 31 stabilize at the set values, gradually open the sewage valve 122-2 while gradually closing the clean water valve 121-2 to gradually switch the inlet water to sewage. The sewage is pressurized to 23 to 25 MPa by the high-pressure feed pump 123-1 and fully mixed with high-pressure air from the buffer tank 111-2 in the jet mixer 6. After being heated to the range of 260 to 300°C by the waste heat preheater 21 and the electromagnetic preheater 22, it enters the reaction system 3 through the feed pipe 221.

[0035] 6. The preheated material enters the reaction system 3, where the temperature is further increased to 400-600℃ under the action of the electromagnetic heating coil 34. A supercritical water oxidation reaction occurs in the inner cylinder 313, generating high-temperature fluids such as CO2, H2O, and N2, while high-temperature salts are precipitated. The high-temperature fluid generated by the reaction is discharged from the high-temperature fluid outlet 312-2 of the outer cylinder 312. It then passes through the return pipe 211, where the temperature is reduced to below 300℃ under the action of the shell-and-tube heat exchanger 7. It then enters the tube side of the waste heat preheater 21, where it exchanges heat with the new preheated material in the tube side. Finally, it enters the cooling tower 51 of the cooling system 5 through the first air inlet branch 511 via the high-temperature fluid electric regulating outlet valve 514.

[0036] 7. The high-temperature salt precipitated from the reaction falls under gravity through the brine inlet pipe to the lower end of the outer cylinder 312, where it dissolves in the subcritical water to form subcritical brine. During salt discharge, firstly, the high-temperature discharge valve 41 is opened, and the subcritical brine enters the subcritical brine tank 42 under pressure differential. Subsequently, the high-temperature discharge valve 41 is completely closed, and the low-temperature discharge valve 43 is opened. Under pressure differential, the subcritical brine enters the brine flash tank 44 through the brine outlet pipe, where it flashes to obtain solid salt. High-temperature gas is then discharged from the flash gas outlet 442 and enters the cooling tower 51 through the second inlet branch 512. Finally, the low-temperature discharge valve 43 is closed. The above steps are repeated to achieve salt discharge.

[0037] 8. Circulating cooling water, driven by circulating pump 521-1, enters cooling tower 51 from the first cooling branch 521 of cooling tower 52. It cools the high-temperature fluid discharged from reaction system 3 and the flash gas from brine flash tank 44 to below 50°C, then returns to cooling tower 52 via condensate pipe, releasing non-condensable gases. The circulating cooling water in cooling tower 52 is further cooled to below 35°C by fan 53.

[0038] II. Shutdown Procedure

[0039] 1. First, close the sewage valve 122-2 and open the clean water valve 121-2 until all the sewage entering the system is oxidized and decomposed.

[0040] 2. Turn off the electromagnetic heating coil switch, and turn off the power switches of feed pump 123-1 and air compressor 111-1;

[0041] 3. Once the system temperature drops to room temperature, turn off the circulating pump 521-1 and the fan 53 to stop the cooling water circulation.

[0042] Of course, the above description is not intended to limit the present utility model, and the present utility model is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present utility model should also fall within the protection scope of the present utility model.

Claims

1. A supercritical water oxidation device, characterized in that, It includes a feeding system, a preheating system, a reaction system, a salt discharge system, and a cooling system; the gas pipeline and liquid pipeline of the feeding system are respectively connected to the waste heat preheater of the preheating system through a jet mixer; the electromagnetic preheater of the preheating system is connected to the feed inlet of the reaction system through a feed pipeline; the high-temperature fluid outlet of the reaction system is connected to the waste heat preheater of the preheating system through a return pipeline; the discharge outlet of the reaction system is connected to the subcritical brine tank of the salt discharge system through a brine inlet pipeline; and the brine flash tank of the salt discharge system is connected to the cooling tower of the cooling system.

2. The supercritical water oxidation device according to claim 1, characterized in that, The jet mixer includes a gas inlet, a liquid inlet, and a mixing outlet; the gas pipeline is connected to the gas inlet, the liquid pipeline is connected to the liquid inlet, and the mixing outlet is connected to the waste heat preheater of the preheating system.

3. The supercritical water oxidation device according to claim 2, characterized in that, The gas pipeline includes a main gas pipeline, a first gas pipeline branch, and a second gas pipeline branch. The end of the main gas pipeline and the beginnings of the first and second gas pipeline branches are connected. The ends of the first and second gas pipeline branches are connected to a gas inlet. An air compressor and a buffer tank are provided on the main gas pipeline. An air flow regulating valve and an air flow meter are provided on the first gas pipeline branch. An air pulse purging valve is provided on the second gas pipeline branch.

4. The supercritical water oxidation device according to claim 2, characterized in that, The liquid pipeline is divided into a clean water branch, a sewage branch, and a main liquid pipeline. The clean water branch and the sewage branch are connected to the liquid inlet through the main liquid pipeline. The clean water branch is connected to a clean water tank at its starting end and is equipped with a clean water valve. The sewage branch is connected to a sewage tank at its starting end and is equipped with a sewage valve. The main liquid pipeline is equipped with a feed pump.

5. The supercritical water oxidation device according to claim 1, characterized in that, The return pipeline is equipped with a shell-and-tube heat exchanger.

6. The supercritical water oxidation device according to claim 5, characterized in that, The reaction system includes a reaction vessel and a rupture disc. The reaction vessel is provided with an insulation layer and an electromagnetic heating coil on the outside. The rupture disc is located at the upper end of the reaction vessel. The reaction vessel includes an upper end cover, an outer cylinder and an inner cylinder. The upper end cover is adapted to the outer cylinder, and the inner cylinder is set in the cavity of the outer cylinder.

7. The supercritical water oxidation device according to claim 6, characterized in that, The upper end cover is provided with a sealing ring for sealing the gap between the upper end cover and the outer cylinder. The feed port is opened at the top of the upper end cover and is connected to the inner cylinder. The discharge port is located at the bottom of the outer cylinder, and the high-temperature fluid outlet is located on the side wall of the outer cylinder. A conical guide plate is provided above the discharge port.

8. The supercritical water oxidation device according to claim 1, characterized in that, The subcritical brine tank is connected to the brine flash tank via a brine outlet pipe. A high-temperature brine discharge valve is installed on the brine inlet pipe, and a low-temperature brine discharge valve is installed on the brine outlet pipe. The subcritical brine tank is connected to the cooling tower and the chilled water tower of the cooling system. The brine flash tank is equipped with a brine discharge port, a flash gas outlet, and a subcritical brine inlet. The subcritical brine inlet is connected to the brine outlet pipe, and the flash gas outlet is connected to the cooling tower of the cooling system. The brine discharge port discharges the salt.

9. A supercritical water oxidation device according to claim 8, characterized in that, The cooling system includes a fan, and the cooling tower is connected to the cooling water tower through a condensate pipe. The fan is installed in the cooling water tower. The cooling tower is connected to the waste heat preheater of the preheating system through a first air inlet branch, to the flash gas outlet through a second air inlet branch, and to the subcritical brine tank through a water inlet branch. The first air inlet branch is equipped with a high-temperature fluid electric regulating outlet valve, and the water inlet branch is equipped with an automatic pressure regulating valve.

10. A supercritical water oxidation device according to claim 9, characterized in that, The cooling tower is connected to the cooling tower via a first cooling branch and to the subcritical brine tank via a second cooling branch. The second cooling branch passes through a shell-and-tube heat exchanger. A circulation pump is installed on the first cooling branch and a cold water plunger pump is installed on the second cooling branch.

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