A supercritical water treatment system

Abstract

This utility model relates to a supercritical water treatment system, comprising: a wastewater pretreatment mechanism, a preheating mechanism, a mixing and reaction mechanism, a heat recovery mechanism, and an impurity treatment mechanism. The wastewater pretreatment mechanism includes a wastewater source, a grid plate, a first wastewater pump, a wastewater storage tank, and a second wastewater pump. The preheating mechanism includes: a heat exchanger, a first solid-liquid separator, and a heater. The mixing and reaction mechanism includes a reactor. The heat recovery mechanism includes a second solid-liquid separator and a steam generator. The impurity treatment mechanism includes: a drainage ditch. Compared with the prior art, the supercritical water treatment system of this utility model adds a heat exchanger. By passing the 450°C clean water after the reactor reaction into the heat exchanger to exchange heat with the wastewater passing into the heat exchanger, the temperature of the wastewater is increased, thereby reducing the workload of the subsequent heater, saving energy, and realizing the reuse of the heat energy of the clean water after the reactor reaction.

Description

[Technical Field]

[0001] This utility model relates to the field of wastewater treatment, and in particular to a supercritical water treatment system. [Background Technology]

[0002] With the continuous expansion of industrial development, the types and quantities of wastewater have increased rapidly, and the negative impact of industrial wastewater discharge on the human living environment has become increasingly significant, making the effective treatment of industrial wastewater particularly important. Based on different implementation methods, wastewater treatment can be divided into two main categories: separation methods and conversion methods. Separation methods use various external forces to separate harmful substances from wastewater; conversion methods use chemical or biological processes to transform harmful substances into harmless or separable substances (which are then removed through separation). These two traditional water treatment methods are characterized by the consumption of large amounts of energy or materials during the treatment process, and they are difficult to achieve discharge standards for high-concentration, recalcitrant organic wastewater, let alone reuse. Currently, most domestic enterprises use incineration and other methods to treat high-concentration, recalcitrant organic wastewater, but incineration is essentially a transfer of pollutants (transferring pollutants from liquid wastewater into the atmosphere). Later, the industry proposed supercritical water oxidation technology to treat high-concentration, recalcitrant organic wastewater. Therefore, a supercritical water treatment system is required. As those skilled in the art know, wastewater needs to be preheated before entering the reactor. In the existing technology, wastewater preheating is mainly achieved through heaters, which have a heavy workload and consume a lot of energy. The temperature of the clean water after reactor treatment can reach 450°C. The existing technology does not recover and utilize this heat. Therefore, we thought that if the heat energy of the 450°C clean water after reactor treatment could be recovered and utilized, it would greatly reduce the workload of the heater and save energy. This utility model aims to provide such a supercritical water treatment system. [Utility Model Content]

[0003] To address the aforementioned problems, the purpose of this invention is to provide a supercritical water treatment system that can reduce production costs.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a supercritical water treatment system, comprising: a wastewater pretreatment mechanism, a preheating mechanism, a mixing reaction mechanism, a heat recovery mechanism, and an impurity treatment mechanism. The wastewater pretreatment mechanism includes a wastewater source, the outlet of which is connected to the inlet of a grid plate. The outlet of the grid plate is connected to the inlet of a first wastewater pump. The outlet of the first wastewater pump is connected to the inlet of a wastewater storage tank. The outlet of the wastewater storage tank is connected to the inlet of a second wastewater pump. The preheating mechanism includes: a heat exchanger, a first solid-liquid separator, and a heater. The cold fluid inlet of the heat exchanger is connected to the outlet of the second wastewater pump. The cold fluid outlet of the heat exchanger is connected to the inlet of the first solid-liquid separator. The outlet of the first solid-liquid separator is connected to the wastewater inlet of the heater. The mixing reaction mechanism includes a reaction... The reactor has a fluid inlet connected to the wastewater outlet of the heater, a liquid oxygen inlet connected to the outlet of the liquid oxygen pump, and an inlet of the liquid oxygen pump connected to the liquid oxygen storage tank. The heat recovery mechanism includes a second solid-liquid separator and a steam generator. The inlet of the second solid-liquid separator is connected to the fluid outlet of the reactor, and the outlet of the second solid-liquid separator is connected to the hot fluid inlet of the heat exchanger. The hot fluid outlet of the heat exchanger is connected to the tube-side inlet of the steam generator. 80°C hot water is output from the tube-side outlet of the steam generator. The shell-side inlet of the steam generator is connected to tap water, and saturated steam is output from the shell-side outlet of the steam generator. The impurity treatment mechanism includes a trench connected to the bottom outlet of the wastewater storage tank, the bottom outlet of the first solid-liquid separator, and the bottom outlet of the second solid-liquid separator.

[0005] Preferably, the supercritical water treatment system of this utility model is further configured such that the second sewage pump is a high-pressure plunger pump.

[0006] Preferably, a supercritical water treatment system of the present invention is further configured as follows: a first valve is provided on the pipeline connecting the liquid oxygen storage tank and the liquid oxygen pump; a second valve is provided on the pipeline connecting the liquid oxygen pump and the reactor; a third valve is provided on the pipeline connecting the reactor and the second solid-liquid separator; a fourth valve is provided on the pipeline connecting the second solid-liquid separator and the heat exchanger; a fifth valve is provided on the pipeline connecting the first solid-liquid separator and the heat exchanger; a sixth valve is provided on the pipeline connecting the heat exchanger and the steam generator; a seventh valve is provided on the pipeline connecting the heat exchanger and the second sewage pump; an eighth valve is provided on the pipeline connecting the second sewage pump and the sewage storage tank; a ninth valve is provided on the pipeline connecting the sewage storage tank and the ditch; and a tenth valve is provided on the pipeline connecting the sewage storage tank and the first sewage pump.

[0007] Preferably, the supercritical water treatment system in the present utility model is further configured such that: the first valve, the second valve, the third valve, the fourth valve, the fifth valve, the sixth valve, the seventh valve, the eighth valve, the ninth valve and the tenth valve are all solenoid valves.

[0008] Preferably, the supercritical water treatment system in the present utility model is further configured such that: the first valve, the second valve, the third valve, the fourth valve, the fifth valve, the sixth valve, the seventh valve, the eighth valve, the ninth valve and the tenth valve are respectively connected to a controller.

[0009] Preferably, the supercritical water treatment system in the present utility model is further configured such that: the controller is a PLC controller.

[0010] Preferably, the supercritical water treatment system in the present utility model is further configured such that: the sewage storage tank is a sewage storage tank provided with stirring blades.

[0011] Compared with the prior art, the present utility model has the following beneficial effects: compared with the prior art, the supercritical water treatment system in the present utility model is additionally provided with a heat exchanger. By feeding the 450°C clean water after reaction in the reactor into the heat exchanger to exchange heat with the sewage fed into the heat exchanger, the temperature of the sewage is increased, thereby reducing the working load of the subsequent heater, saving energy, and realizing reuse of the heat energy of the clean water after reaction in the reactor. Description of Drawings

[0012] Figure 1 is a working principle diagram of the supercritical water treatment system in the present utility model.

[0013] Figure 1 in the figure: 1. sewage source, 2. grid plate, 3. first sewage pump, 4. sewage storage tank, 5. second sewage pump, 6. heat exchanger, 7. first solid-liquid separator, 8. heater, 9. reactor, 10. liquid oxygen pump, 11. liquid oxygen storage tank, 12. second solid-liquid separator, 13. steam generator, 14. sewer, 15. first valve, 16. second valve, 17. third valve, 18. fourth valve, 19. fifth valve, 20. sixth valve, 21. seventh valve, 22. eighth valve, 23. ninth valve, 24. tenth valve. Detailed Description of Embodiments

[0014] The supercritical water treatment system according to the present utility model will be further described in detail below through specific embodiments.

[0015] Reference Figure 1As shown, a supercritical water treatment system includes: a wastewater pretreatment mechanism, a preheating mechanism, a mixing and reaction mechanism, a heat recovery mechanism, and an impurity treatment mechanism. The wastewater pretreatment mechanism includes a wastewater source 1, the outlet of which is connected to the inlet of a grid plate 2. The outlet of the grid plate 2 is connected to the inlet of a first wastewater pump 3. The outlet of the first wastewater pump 3 is connected to the inlet of a wastewater storage tank 4. The outlet of the wastewater storage tank 4 is connected to the inlet of a second wastewater pump 5. In this embodiment, the wastewater storage tank 4 is a wastewater storage tank with stirring blades. The preheating mechanism includes: a heat exchanger 6, a first solid-liquid separator 7, and a heater 8. The cold fluid inlet of the heat exchanger 6 is connected to the outlet of the second wastewater pump 5. In this embodiment, the second wastewater pump 5 is a high-pressure plunger pump. The cold fluid outlet of the heat exchanger 6 is connected to the inlet of the first solid-liquid separator 7, and the outlet of the first solid-liquid separator 7 is connected to the wastewater inlet of the heater 8. The mixing reaction mechanism includes a reactor 9, the fluid inlet of which is connected to the wastewater outlet of the heater 8, the liquid oxygen inlet of which is connected to the outlet of the liquid oxygen pump 10, and the inlet of the liquid oxygen pump 10 is connected to the liquid oxygen storage tank 11. The heat recovery mechanism includes a second solid-liquid separator 12 and a steam generator 13, the inlet of which is connected to the fluid outlet of the reactor 9. The outlet of the second solid-liquid separator 12 is connected to the hot fluid inlet of the heat exchanger 6, and the hot fluid outlet of the heat exchanger 6 is connected to the tube inlet of the steam generator 13. 80°C hot water is output from the tube outlet of the steam generator 13, and the shell inlet of the steam generator 13 is connected to tap water. Saturated steam is output from the shell outlet of the steam generator 13. The impurity treatment mechanism includes a trench 14, which is connected to the bottom outlet of the sewage storage tank 4, the bottom outlet of the first solid-liquid separator 7, and the bottom outlet of the second solid-liquid separator 12, respectively.

[0016] A first valve 15 is provided on the pipe connecting the liquid oxygen storage tank 11 and the liquid oxygen pump 10. A second valve 16 is provided on the pipe connecting the liquid oxygen pump 10 and the reactor 9. A third valve 17 is provided on the pipe connecting the reactor 9 and the second solid-liquid separator 12. A fourth valve 18 is provided on the pipe connecting the second solid-liquid separator 12 and the heat exchanger 6. A fifth valve 19 is provided on the pipe connecting the first solid-liquid separator 7 and the heat exchanger 6. A sixth valve 20 is provided on the pipe connecting the heat exchanger 6 and the steam generator 13. A seventh valve 21 is provided on the pipe connecting the heat exchanger 6 and the second sewage pump 5. An eighth valve 22 is provided on the pipe connecting the second sewage pump 5 and the sewage storage tank 4. A ninth valve 23 is provided on the pipe connecting the sewage storage tank 4 and the ditch 14. A tenth valve 24 is provided on the pipe connecting the sewage storage tank 4 and the first sewage pump 3. In this embodiment, the first valve 15, the second valve 16, the third valve 17, the fourth valve 18, the fifth valve 19, the sixth valve 20, the seventh valve 21, the eighth valve 22, the ninth valve 23, and the tenth valve 24 are all solenoid valves. The first valve 15, the second valve 16, the third valve 17, the fourth valve 18, the fifth valve 19, the sixth valve 20, the seventh valve 21, the eighth valve 22, the ninth valve 23, and the tenth valve 24 are respectively connected to a controller (not shown). The controller may include a microprocessor (MCU), which may include a central processing unit (CPU), a read-only memory (ROM), a random access memory (RAM), a timing module, a digital-to-analog converter (A / D converter), and complex input / output ports. Of course, the controller may also use other types of integrated circuits, such as application-specific integrated circuits (ASICs) or field-programmable gate arrays (FPGAs). In this embodiment, the controller is a PLC controller.

[0017] The working principle of the supercritical water treatment system in this utility model is as follows: Wastewater first enters the grid plate 2 for physical filtration. The filtered wastewater is pumped into the wastewater storage tank 4 by the first wastewater pump 3. After being stirred evenly in the wastewater storage tank 4, the wastewater is pumped into the heat exchanger 6 by the second wastewater pump 5 to exchange heat with the 450°C clean water after reaction. The wastewater after heat exchange enters the heater 8 for preheating. After preheating, it enters the reactor 9 and reacts with oxygen in the supercritical state to generate 450°C clean water. After exchanging heat with the wastewater in the heat exchanger 6, the clean water enters the steam generator 13 and is discharged after being cooled and depressurized by water.

[0018] In summary, the supercritical water treatment system of this invention adds a heat exchanger 6 compared with the prior art. By passing the 450°C clean water after the reaction in reactor 9 into the heat exchanger 6 to exchange heat with the sewage passing into the heat exchanger 6, the temperature of the sewage is increased, thereby reducing the workload of the subsequent heater, saving energy, and realizing the reuse of the heat energy of the clean water after the reaction in reactor 9.

[0019] The above embodiments are merely illustrative of the principles and effects of this utility model, as well as some of its applications, and are not intended to limit this utility model. It should be noted that those skilled in the art can make various modifications and improvements without departing from the inventive concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.

Claims

1. A supercritical water treatment system, characterized by: include: The system includes a wastewater pretreatment unit, a preheating unit, a mixing and reaction unit, a heat recovery unit, and an impurity treatment unit. The wastewater pretreatment unit includes a wastewater source, the outlet of which is connected to the inlet of a grate plate. The outlet of the grate plate is connected to the inlet of a first wastewater pump. The outlet of the first wastewater pump is connected to the inlet of a wastewater storage tank. The outlet of the wastewater storage tank is connected to the inlet of a second wastewater pump. The preheating unit includes a heat exchanger, a first solid-liquid separator, and a heater. The cold fluid inlet of the heat exchanger is connected to the outlet of the second wastewater pump. The cold fluid outlet of the heat exchanger is connected to the inlet of the first solid-liquid separator. The outlet of the first solid-liquid separator is connected to the wastewater inlet of the heater. The mixing and reaction unit includes a reactor. The fluid inlet of the reactor is connected to the wastewater inlet of the heater. The reactor is connected to a water outlet. The liquid oxygen inlet of the reactor is connected to the outlet of the liquid oxygen pump. The inlet of the liquid oxygen pump is connected to the liquid oxygen storage tank. The heat recovery mechanism includes a second solid-liquid separator and a steam generator. The inlet of the second solid-liquid separator is connected to the fluid outlet of the reactor. The outlet of the second solid-liquid separator is connected to the hot fluid inlet of the heat exchanger. The hot fluid outlet of the heat exchanger is connected to the tube-side inlet of the steam generator. 80°C hot water is output from the tube-side outlet of the steam generator. The shell-side inlet of the steam generator is connected to tap water. Saturated steam is output from the shell-side outlet of the steam generator. The impurity treatment mechanism includes a trench, which is connected to the bottom outlet of the sewage storage tank, the bottom outlet of the first solid-liquid separator, and the bottom outlet of the second solid-liquid separator, respectively.

2. A supercritical water treatment system as claimed in claim 1, wherein: The second sewage pump is a high-pressure plunger pump.

3. A supercritical water treatment system as defined in claim 1, wherein: A first valve is installed on the pipeline connecting the liquid oxygen storage tank and the liquid oxygen pump; a second valve is installed on the pipeline connecting the liquid oxygen pump and the reactor; a third valve is installed on the pipeline connecting the reactor and the second solid-liquid separator; a fourth valve is installed on the pipeline connecting the second solid-liquid separator and the heat exchanger; a fifth valve is installed on the pipeline connecting the first solid-liquid separator and the heat exchanger; a sixth valve is installed on the pipeline connecting the heat exchanger and the steam generator; a seventh valve is installed on the pipeline connecting the heat exchanger and the second sewage pump; an eighth valve is installed on the pipeline connecting the second sewage pump and the sewage storage tank; a ninth valve is installed on the pipeline connecting the sewage storage tank and the ditch; and a tenth valve is installed on the pipeline connecting the sewage storage tank and the first sewage pump.

4. A supercritical water treatment system as in claim 1, wherein: The first valve, the second valve, the third valve, the fourth valve, the fifth valve, the sixth valve, the seventh valve, the eighth valve, the ninth valve, and the tenth valve are all solenoid valves.

5. A supercritical water treatment system as claimed in claim 4, wherein: The first valve, second valve, third valve, fourth valve, fifth valve, sixth valve, seventh valve, eighth valve, ninth valve and tenth valve are respectively connected to the controller.

6. A supercritical water treatment system as claimed in claim 5, wherein: The controller is a PLC controller.

7. A supercritical water treatment system as in claim 1, wherein: The wastewater storage tank is a wastewater storage tank equipped with stirring blades.

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