Desalted water treatment system

Abstract

The invention relates to the technical field of demineralized water preparation, and discloses a demineralized water treatment system which comprises a deoxidizing device, one end of the deoxidizing device is communicated with a demineralized water supply pipeline, the other end of the deoxidizing device is communicated with a demineralized water storage part, a mixing cavity and a separation cavity are formed in the deoxidizing device, and a mixing assembly is installed in the mixing cavity; the inner diameter of the separation chamber is not smaller than that of the mixing chamber; the nitrogen supply equipment is communicated with the inlet end of the deoxidizing equipment through a nitrogen supply pipeline, and the nitrogen supply equipment is suitable for continuously conveying pressurized nitrogen to the inlet end of the deoxidizing equipment. Under the action of the mixing assembly, the nitrogen and the demineralized water are fully mixed, so that oxygen in the demineralized water is discharged. According to the desalted water treatment system, gas mixing exchange is used for replacing a high-energy-consumption steam thermal deoxidizing device, highly toxic chemical reagents such as hydrazine do not need to be added, the operating cost of drugs and the like is reduced, the system is friendly to workers and the environment, the system is simple, and the labor intensity and the influence of human factors are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of desalted water preparation, and in particular to a desalted water treatment system. Background Art

[0002] Demineralized water is a product obtained by removing pollutants from water using ultrafiltration, reverse osmosis, cation bed, continuous electro-deionization and other treatment processes. It is widely used in many industries such as thermal power generation and semiconductors. The quality of demineralized water is directly related to the economy, safety and product quality of thermal power generation and semiconductor production.

[0003] The dissolved oxygen content in desalted water is about 9000μg / L. The dissolved oxygen content in desalted water is related to the desalted water preparation process, water source, temperature and other aspects. In the field of thermal power generation, the dissolved oxygen in desalted water will increase the corrosion and scaling of the water vapor system of the thermal power generation unit, affecting the economy and safety of the unit; in the semiconductor field, the dissolved oxygen in desalted water will cause oxidation of the silicon wafer surface, affecting the production quality and yield rate. In order to reduce the impact of dissolved oxygen in desalted water on production, methods should be taken to try to reduce the dissolved oxygen content in desalted water.

[0004] In the prior art, thermal deoxygenation, chemical deoxygenation, vacuum deoxygenation, hollow fiber membrane deoxygenation and the like are mainly used for deoxygenating desalted water. The deoxygenation process has high heat consumption, requires the addition of chemical deoxygenators, and has high operating and maintenance costs. Summary of the invention

[0005] In view of this, the present invention provides a desalted water treatment system to solve the problems in the prior art of desalted water deoxygenation process, such as high heat consumption in the deoxygenation process, the need to add chemical deoxygenators, and high operating and maintenance costs.

[0006] In a first aspect, the present invention provides a desalted water treatment system, comprising:

[0007] A deoxygenation device, one end of which is connected to the desalted water supply pipeline and the other end of which is connected to the desalted water storage component, wherein a mixing chamber and a separation chamber are arranged in the deoxygenation device, a mixing assembly is installed in the mixing chamber, and the inner diameter of the separation chamber is not less than the inner diameter of the mixing chamber;

[0008] The nitrogen supply equipment is connected to the inlet end of the deoxygenation equipment through a nitrogen supply pipeline, and the nitrogen supply equipment is suitable for continuously delivering pressurized nitrogen to the inlet end of the deoxygenation equipment.

[0009] When the desalted water treatment system is in operation, pressurized nitrogen is introduced from the nitrogen supply device into the deoxygenation device, and the desalted water is transported to the deoxygenation device through the desalted water supply pipeline. In the mixing chamber of the deoxygenation device, the nitrogen and the desalted water are fully mixed under the action of the mixing component to discharge the oxygen in the desalted water. The fully mixed nitrogen and desalted water enter the separation chamber, and the nitrogen and the desalted water are separated under the action of gravity, inertia and expansion. The desalted water treatment system uses gas mixing exchange to replace the high-energy-consuming steam thermal deoxygenation device, without the need to add highly toxic chemical reagents such as hydrazine, reducing the operating costs of drugs, etc., is friendly to the staff and the environment, and the system is simple, reducing labor intensity and the impact of human factors.

[0010] In an optional embodiment, the mixing assembly includes a transverse static mixer and a longitudinal static mixer, the flow channel of the transverse static mixer is arranged vertically with the flow channel of the longitudinal static mixer, and the transverse static mixer and the longitudinal static mixer are both provided in plurality. The desalted water mixed with nitrogen enters the transverse static mixer and the longitudinal static mixer in turn for continued mixing and other exchanges, thereby increasing the mixing degree of nitrogen and deoxygenated water and improving the deoxygenation efficiency.

[0011] In an optional embodiment, the transverse static mixer and the longitudinal static mixer are arranged alternately to increase the disturbance degree of the deoxygenated water during the flow process, improve the mixing degree of nitrogen and deoxygenated water, and optimize the deoxygenation quality.

[0012] In an optional embodiment, a nitrogen atomizing disk is further installed in the mixing chamber, and the nitrogen atomizing disk is installed upstream of the mixing assembly. The nitrogen is atomized by the nitrogen atomizing disk and fully mixed with the deionized water to reduce the difficulty of nitrogen blending into the deoxygenated water and increase the amount of nitrogen dissolved in the deoxygenated water.

[0013] In an optional embodiment, the bottom of the separation chamber is arranged lower than the bottom of the mixing chamber. When the deoxygenated water enters the separation chamber, the nitrogen in the deoxygenated water is separated from the desalted water by the downward drop under the action of gravity, inertia and expansion.

[0014] In an optional embodiment, the separation chamber includes a primary separation chamber and a secondary separation chamber, the primary separation chamber is arranged between the mixing chamber and the secondary separation chamber, a pressure relief protrusion is arranged in the inner cavity of the secondary separation chamber, and an exhaust valve is installed on the pressure relief protrusion.

[0015] In an optional embodiment, the inner diameter of the separation chamber is not less than twice the inner diameter of the desalted water supply pipeline.

[0016] In an optional embodiment, the desalted water storage component is provided with an exhaust pipeline, and an air intake branch is connected between the nitrogen supply pipeline and the desalted water storage component, and the air intake branch is suitable for introducing nitrogen into the desalted water storage component to maintain a positive pressure in the inner cavity of the desalted water storage component, so as to prevent air from entering the desalted water storage component and causing oxygen to dissolve again in the desalted water.

[0017] In an optional embodiment, the nitrogen supply equipment includes a nitrogen storage tank and a nitrogen generator, and the nitrogen generator is connected to the upstream of the nitrogen storage tank. The nitrogen generator can produce nitrogen with higher purity to ensure the ability of nitrogen to replace oxygen in desalted water.

[0018] In an optional embodiment, the nitrogen pressure in the nitrogen supply pipeline is not less than twice the pressure of the deionized water in the deionized water supply pipeline. By ensuring the nitrogen pressure, the nitrogen solubility in the deoxygenated water can be increased, thereby improving the ability to remove oxygen in the deoxygenated water. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A schematic structural diagram of a desalted water treatment system provided in an embodiment of the present invention.

[0021] Figure 2 A schematic structural diagram of a deoxygenation device provided in an embodiment of the present invention.

[0022] Explanation of the reference numerals: 1. Desalted water supply pipeline; 2. Inlet dissolved oxygen meter; 3. Deoxygenation equipment; 4. Outlet dissolved oxygen meter; 5. Desalted water tank; 6. One-way exhaust valve; 7. Pressure gauge; 8. Nitrogen generator; 9. Nitrogen storage tank; 10. Nitrogen regulating valve; 11. Inlet valve; 12. Nitrogen supply pipeline; 13. Nitrogen atomizing disk; 14. Horizontal static mixer; 15. Vertical static mixer; 16. Primary separation chamber; 17. Exhaust valve; 18. Secondary separation chamber; 19. Desalted water flow meter; 20. Nitrogen flow meter; 21. Nitrogen pressure gauge; 22. Nitrogen temperature gauge. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0024] Combine the following Figure 1 and Figure 2 , describing an embodiment of the present invention.

[0025] In a first aspect, the present invention provides a desalted water treatment system for deoxygenating the prepared desalted water. The desalted water treatment equipment includes a deoxygenation device 3 and a nitrogen supply device.

[0026] One end of the deoxygenator 3 is connected to the desalted water supply pipeline 1, and the other end is connected to the desalted water storage component. A mixing chamber and a separation chamber are provided in the deoxygenator 3. A mixing assembly is installed in the mixing chamber, and the inner diameter of the separation chamber is not less than the inner diameter of the mixing chamber. The nitrogen supply device is connected to the inlet end of the deoxygenator 3 through the nitrogen supply pipeline 12, and the nitrogen supply device is suitable for continuously delivering pressurized nitrogen to the inlet end of the deoxygenator 3.

[0027] When the desalted water treatment system is in operation, pressurized nitrogen is introduced from the nitrogen supply device into the deoxygenation device 3, and the desalted water is transported to the deoxygenation device 3 through the desalted water supply pipeline 1. In the mixing chamber of the deoxygenation device 3, the nitrogen and the desalted water are fully mixed under the action of the mixing component. The fully mixed nitrogen and the desalted water enter the separation chamber, and the nitrogen and the desalted water are separated under the action of gravity, inertia and expansion. The desalted water treatment system uses gas mixing exchange to replace the high-energy-consuming steam thermal deoxygenation device, and there is no need to add highly toxic chemical reagents such as hydrazine, which reduces the operating costs of medicines, etc., is friendly to the staff and the environment, and the system is simple, reducing the labor intensity and the influence of human factors. Compared with vacuum deoxygenation, the present invention has no vacuum system and spray system, low investment, simple device, high reliability, and better deoxygenation effect than vacuum deoxygenation; compared with hollow fiber membrane deoxygenation, the present invention has low initial investment, no consumable parts, low maintenance cost, easy operation, long-term stable operation, and low operating cost. In summary, compared with the traditional method, the present invention has the characteristics of simple device, low initial investment, low operation and maintenance cost, good deoxygenation effect, environmental friendliness, and easy operation.

[0028] Among them, the desalted water storage unit uses a desalted water tank 5. In some other embodiments, the desalted water storage unit can also use a closed structure such as a water storage tank. In order to facilitate the measurement of the initial oxygen dissolved in the desalted water and the delivery flow of the desalted water, an inlet dissolved oxygen meter 2 and a desalted water flow meter 19 are installed on the desalted water supply pipeline 1. In order to facilitate the measurement of the oxygen dissolved in the desalted water stored in the desalted water storage unit, an outlet dissolved oxygen meter 4 is installed on the pipeline between the deoxygenation equipment 3 and the desalted water storage unit. In order to monitor and measure the air pressure in the desalted water storage unit in real time, a barometer 7 is installed on the desalted water storage unit. In order to facilitate the measurement and control of the flow, pressure and temperature of nitrogen, a nitrogen flow meter 20, a nitrogen pressure gauge 21, a nitrogen temperature gauge 22 and a nitrogen regulating valve 10 are installed on the nitrogen supply pipe.

[0029] In one embodiment, the mixing assembly includes a transverse static mixer 14 and a longitudinal static mixer 15. The flow channel of the transverse static mixer 14 is arranged vertically with the flow channel of the longitudinal static mixer 15. There are multiple transverse static mixers 14 and longitudinal static mixers 15. The desalted water mixed with nitrogen enters the transverse static mixer 14 and the longitudinal static mixer 15 in sequence to continue mixing and other exchanges, thereby increasing the mixing degree of nitrogen and deoxygenated water and improving the deoxygenation efficiency.

[0030] Specifically, the transverse static mixers 14 and the longitudinal static mixers 15 are arranged alternately to increase the disturbance degree of the deoxygenated water during the flow process, improve the mixing degree of nitrogen and deoxygenated water, and optimize the deoxygenation quality.

[0031] Furthermore, a nitrogen atomizing disk 13 is installed in the mixing chamber, and the nitrogen atomizing disk 13 is installed upstream of the mixing assembly. The nitrogen atomizing disk 13 is used to atomize the nitrogen and fully mix it with the deionized water, so as to reduce the difficulty of nitrogen blending into the deoxygenated water and increase the amount of nitrogen dissolved in the deoxygenated water.

[0032] In one embodiment, the bottom of the separation chamber is arranged lower than the bottom of the mixing chamber. When the deoxygenated water enters the separation chamber, the nitrogen in the deoxygenated water is separated from the desalted water by the downward drop under the action of gravity, inertia and expansion.

[0033] Specifically, the separation chamber includes a primary separation chamber 16 and a secondary separation chamber 18. The primary separation chamber 16 is disposed between the mixing chamber and the secondary separation chamber 18. A pressure relief protrusion is disposed in the inner cavity of the secondary separation chamber 18, and an exhaust valve 17 is installed on the pressure relief protrusion. In this embodiment, in order to ensure that nitrogen can be fully separated from the desalted water, the inner diameter of the separation chamber is not less than twice the inner diameter of the desalted water supply pipeline 1.

[0034] In one embodiment, there is an exhaust pipeline on the desalted water storage component, and a one-way exhaust valve 6 is installed on the exhaust pipeline to prevent external air from entering the desalted water storage component from the exhaust pipeline. An intake branch is connected between the nitrogen supply pipeline 12 and the desalted water storage component, and the intake branch is suitable for passing nitrogen into the desalted water storage component to maintain a positive pressure in the inner cavity of the desalted water storage component to prevent air from entering the desalted water storage component and causing oxygen to dissolve again in the desalted water. In order to facilitate the control of the nitrogen in the intake branch, an intake valve 11 is installed on the intake branch.

[0035] In one embodiment, the nitrogen supply equipment includes a nitrogen storage tank 9 and a nitrogen generator 8, and the nitrogen generator 8 is connected to the upstream of the nitrogen storage tank 9. The nitrogen generator 8 can produce nitrogen with higher purity to ensure the ability of nitrogen to replace oxygen in the deoxygenated water. In order to increase the solubility of nitrogen in the deoxygenated water, the nitrogen pressure in the nitrogen supply pipeline 12 is not less than twice the pressure of the deoxygenated water in the deoxygenated water supply pipeline 1. By ensuring the nitrogen pressure, the solubility of nitrogen in the deoxygenated water can be increased, thereby improving the ability to remove oxygen in the deoxygenated water.

[0036] In a desalted water treatment system provided in this embodiment, the nitrogen produced by the nitrogen generator 8 has a purity greater than 99.99%, is stored in a nitrogen storage tank, and the nitrogen pressure in the nitrogen supply pipeline 12 is maintained at more than twice the operating pressure of the desalted water in the desalted water supply pipeline 1. The newly produced desalted water flows into the deoxygenation device 3 from the desalted water supply pipeline 1, and enters the deoxygenation device 3 after the desalted water flow meter 19 and the inlet dissolved oxygen meter 2 measure the desalted water flow rate and the dissolved oxygen content at the inlet of the deoxygenation device 3. After entering the deoxygenation device 3, the nitrogen is crushed by the nitrogen atomization disk 13 from the nitrogen supply pipeline 12 and fully mixed with the desalted water. In order to increase the exchange time of nitrogen and oxygen and prevent nitrogen from separating quickly from the desalted water, the desalted water mixed with nitrogen enters the horizontal static mixer 14 and the vertical static mixer 15 to continue gas exchange. The fully mixed nitrogen and desalted water enter the primary separation chamber 16, where they are initially separated under the action of gravity, inertia and volume expansion, and then enter the secondary separation chamber 18. The nitrogen and oxygen separated in the secondary separation chamber 18 are collected at the upper part of the separation chamber and discharged through the exhaust valve 17.

[0037] After exhausting through the exhaust valve 17, a small amount of nitrogen and oxygen that have not escaped in time enter the desalted water tank 5 with the desalted water. Under the action of gravity, the desalted water is collected below the desalted water tank 5, and the nitrogen and oxygen are collected in the gas space above the desalted water tank 5. The dissolved oxygen content in the desalted water is further reduced. When the pressure measured by the barometer 7 is greater than 0.015Mpa, the one-way exhaust valve 6 exhausts to 0.015Mpa and stops, while exhausting oxygen, preventing oxygen in the air from entering the desalted water tank 5. When a large amount of desalted water in the desalted water tank 5 is drawn out, causing the pressure measured by the pressure gauge to be lower than 0.010Mpa, in order to prevent air from entering the desalted water tank 5, the intake valve 11 installed on the intake branch of the desalted water tank 5 is opened, and the desalted water tank 5 is filled with nitrogen until the pressure reaches 0.015Mpa and stops.

[0038] In order to facilitate the monitoring of the flow rate, pressure and temperature of the nitrogen input into the deoxygenation equipment 3, a nitrogen flow meter 20, a nitrogen pressure gauge 21 and a nitrogen temperature gauge 22 are provided on the ammonia supply pipeline. The nitrogen flow rate of the deoxygenation equipment 3 is adjusted through the nitrogen regulating valve 10 according to the desalted water flow rate, the inlet dissolved oxygen content and the set outlet dissolved oxygen content, so as to achieve the purpose of precise control.

[0039] The desalted water treatment system provided in this embodiment also provides a method for deoxygenating desalted water. When the desalted water is deoxygenated, the new desalted water is supplied from the desalted water supply pipeline 1. The inlet dissolved oxygen content measured by the inlet dissolved oxygen meter 2 is C1 (in μg / L), and the desalted water flow rate measured by the desalted water flow meter 19 is V1 (in m 3 / h), the molar mass of oxygen is M (in g / mol), then the amount of oxygen in the deionized water flowing through in time t (in h) is n(O2) (in mol):

[0040]

[0041] After the desalted water flows into the deoxygenation equipment 3 through the desalted water supply pipeline 1, the nitrogen enters the deoxygenation equipment 3 through the nitrogen supply pipeline 12. The nitrogen flow rate measured by the nitrogen flow meter 20 is V2 (in m 3 / h), the nitrogen pressure measured by the nitrogen pressure gauge 21 is P (in Pa), the nitrogen temperature measured by the nitrogen temperature gauge 22 is T (in K), R is the molar gas constant (in J / (mol·K)), and the amount of nitrogen moles contained in the deionized water flowing through in time t is n(N2):

[0042]

[0043] After deoxygenation by the deoxygenation equipment 3, the outlet dissolved oxygen content is detected by the outlet dissolved oxygen meter 4 as C2 (in μg / L). The oxygen content in the desalted water decreases because the gas solubility is proportional to the gas partial pressure, and is proportional to the molar amount (volume) of the gas at a certain temperature and pressure, so:

[0044]

[0045] According to the above formula, the nitrogen flow rate V2 can be obtained as:

[0046]

[0047] In the deionized water deoxygenation process, when the deionized water flow rate V1 is 100m 3 / h, the inlet dissolved oxygen content is C1, which is 9000μg / L, the nitrogen temperature is 293K, R is 8.31J / (mol·K), the outlet dissolved oxygen content is C2, the expected value is 50μg / L, and the nitrogen pressure P is 5×10 5 Pa, the molar mass of oxygen M is 32g / mol. According to the above formula, the nitrogen flow rate of the nitrogen supply pipeline 12 is 24.65m 3 / h. When the deoxygenation device was put into operation for 5 minutes, the outlet dissolved oxygen content C2 was 57μg / L, which exceeded the expected value by 10%. The nitrogen flow rate V2 was based on the nitrogen flow rate calculated by the above formula and was adjusted at a rate of 1% per minute. When V2 was 25.64m 3 / h, the outlet dissolved oxygen content C2 is 51μg / L, which is within 5% of the expected value, and the nitrogen intake volume maintains the current intake volume.

[0048] The deionized water after deoxygenation treatment by the deoxygenation equipment 3 is stored in the deionized water tank 5. The nitrogen and oxygen that have not escaped through the exhaust valve 17 in time enter the gas space above the deionized water tank 5. The water output of the deionized water tank 5 is 70m 3 / h, the desalted water flow rate in the desalted water supply pipeline 1 is 100m 3 / h, the water inlet of the desalting water tank 5 is greater than the water outlet, causing the water level of the desalting water tank 5 to rise, and the gas space above the desalting water tank 5 to decrease. According to the pressure setting of the one-way exhaust valve 6, the one-way exhaust valve 6 automatically exhausts air to the outside of the desalting water tank 5 and stops when the internal pressure of the desalting water tank 5 is no more than 0.015Mpa. While discharging nitrogen and oxygen, it prevents oxygen in the air from entering the desalting water tank 5.

[0049] After the deionized water is deoxygenated, the flow rate of the deionized water in the deionized water supply pipeline 1 is reduced to 0 m 3 / h, but the water output of desalinated water tank 5 is still 70m 3 / h, the water inlet of the desalting water tank 5 is greater than the water outlet, causing the water level of the desalting water tank 5 to rise, the gas space above the desalting water tank 5 to increase, and the pressure to decrease. When the pressure is less than 0.010Mpa, in order to prevent air from entering the desalting water tank 5, the air inlet valve 11 on the air inlet branch of the desalting water tank 5 is opened, and nitrogen is filled from the nitrogen storage tank to the desalting water tank 5 when the pressure reaches 0.015Mpa, so that the desalting water tank 5 is in a positive pressure state sufficient to isolate the air.

[0050] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A desalted water treatment system, characterized in that: include: A deoxygenation device (3), one end of which is connected to the desalted water supply pipeline (1), and the other end of which is connected to the desalted water storage element, wherein a mixing chamber and a separation chamber are arranged in the deoxygenation device (3), a mixing assembly is installed in the mixing chamber, and the inner diameter of the separation chamber is not less than the inner diameter of the mixing chamber; A nitrogen supply device is connected to the inlet end of the deoxygenation device (3) through a nitrogen supply pipeline (12), and the nitrogen supply device is suitable for continuously delivering pressurized nitrogen to the inlet end of the deoxygenation device (3).

2. The desalted water treatment system according to claim 1, characterized in that: The mixing assembly comprises a transverse static mixer (14) and a longitudinal static mixer (15), wherein a flow channel of the transverse static mixer (14) and a flow channel of the longitudinal static mixer (15) are arranged vertically, and a plurality of the transverse static mixer (14) and a plurality of the longitudinal static mixer (15) are provided.

3. The desalted water treatment system according to claim 2, characterized in that: The transverse static mixers (14) and the longitudinal static mixers (15) are arranged alternately.

4. The desalted water treatment system according to any one of claims 1 to 3, characterized in that: A nitrogen atomizing disk (13) is also installed in the mixing chamber, and the nitrogen atomizing disk (13) is installed upstream of the mixing assembly.

5. The desalted water treatment system according to any one of claims 1 to 3, characterized in that: The bottom of the separation chamber is arranged lower than the bottom of the mixing chamber.

6. The desalted water treatment system according to any one of claims 1 to 3, characterized in that: The separation chamber comprises a primary separation chamber (16) and a secondary separation chamber (18); the primary separation chamber (16) is arranged between the mixing chamber and the secondary separation chamber (18); a pressure relief protrusion is arranged in the inner cavity of the secondary separation chamber (18); and an exhaust valve (17) is installed on the pressure relief protrusion.

7. The desalted water treatment system according to claim 6, characterized in that: The inner diameter of the separation chamber is not less than twice the inner diameter of the desalted water supply pipeline (1).

8. The desalted water treatment system according to any one of claims 1 to 3, characterized in that: The desalted water storage component is provided with an exhaust pipeline, and an air intake branch is connected between the nitrogen supply pipeline (12) and the desalted water storage component. The air intake branch is suitable for introducing nitrogen into the desalted water storage component to maintain a positive pressure in the inner cavity of the desalted water storage component.

9. The desalted water treatment system according to any one of claims 1 to 3, characterized in that: The nitrogen supply equipment comprises a nitrogen storage tank (9) and a nitrogen generator (8), wherein the nitrogen generator (8) is connected upstream of the nitrogen storage tank (9).

10. The desalted water treatment system according to any one of claims 1 to 3, characterized in that: The nitrogen pressure in the nitrogen supply pipeline (12) is not less than twice the pressure of the desalted water in the desalted water supply pipeline (1).

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