A desalinated water treatment system

Abstract

The application relates to the technical field of salt water preparation, and discloses a salt water treatment system, which comprises an oxygen removal device, one end of which is communicated with a salt water supply pipeline, and the other end of which is communicated with a salt water storage component; a mixing chamber and a separation chamber are arranged in the oxygen removal device; a mixing assembly is arranged in the mixing chamber; and the inner diameter of the separation chamber is not less than that of the mixing chamber; a nitrogen supply device is communicated with the inlet end of the oxygen removal device through a nitrogen supply pipeline; and the nitrogen supply device is suitable for continuously conveying pressurized nitrogen to the inlet end of the oxygen removal device. Nitrogen and salt water are fully mixed under the action of the mixing assembly to remove oxygen in the salt water. The salt water treatment system uses gas mixing and exchange instead of a high-energy-consumption steam thermal oxygen removal device, does not need to add a toxic chemical reagent such as hydrazine, reduces medicine operation cost, is friendly to workers and the environment, and is simple, reduces labor intensity and the influence of human factors.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of desalted water preparation, in particular to a desalted water treatment system. BACKGROUND

[0002] Desalted water is a product obtained by removing pollutants in water by using ultrafiltration, reverse osmosis, cation and anion beds, continuous electric desalting and other treatment process methods, and is widely used in thermal power generation, semiconductor and other industries. The quality of desalted water is directly related to the economy, safety and product quality of thermal power generation, semiconductor and other production.

[0003] The dissolved oxygen content in desalted water is about 9000 μg / L, and the dissolved oxygen content in desalted water is related to 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 fouling of the water vapor system of the thermal power generating unit, affecting the economy and safety of the unit; in the field of semiconductor, the dissolved oxygen in desalted water will cause the surface oxidation of silicon wafer, affecting the production quality and yield. In order to reduce the influence of dissolved oxygen in desalted water on production, methods should be taken to reduce the dissolved oxygen content in desalted water as much as possible.

[0004] In the prior art, when desalted water is deoxygenated, thermal deoxygenation, chemical deoxygenation, vacuum deoxygenation, hollow fiber membrane deoxygenation and other methods are mainly used. The deoxygenation process has high heat consumption, chemical deoxygenating agent needs to be added, and the operation and maintenance cost is high. SUMMARY

[0005] Therefore, the present application provides a desalted water treatment system to solve the problem of high heat consumption in the deoxygenation process of the desalted water deoxygenation process in the prior art, the need to add chemical deoxygenating agent, and the high operation and maintenance cost.

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

[0007] A deoxygenation device, one end of which is in communication with a desalted water supply pipeline, and the other end of which is in communication with a desalted water storage component, 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] A nitrogen supply device, in communication with the inlet end of the deoxygenation device through a nitrogen supply pipeline, the nitrogen supply device is adapted to continuously transport pressurized nitrogen to the inlet end of the deoxygenation device.

[0009] When the desalinated water treatment system is in operation, pressurized nitrogen gas is fed into the oxygen removal device from a nitrogen gas supply device, and the desalinated water is fed into the oxygen removal device through the desalinated water supply pipeline. In the mixing chamber of the oxygen removal device, the nitrogen gas and the desalinated water are fully mixed under the action of the mixing assembly to remove the oxygen in the desalinated water. The fully mixed nitrogen gas and the desalinated water enter the separation chamber, and the separation of the nitrogen gas and the desalinated water is carried out under the action of gravity, inertia and expansion. The desalinated water treatment system uses gas mixing and exchange to replace the high-energy steam thermal oxygen removal device, and does not need to add toxic chemical reagents such as hydrazine, thereby reducing the operating cost of drugs and the like, and being friendly to the staff and the environment. Moreover, the system is simple, and the labor intensity and human factors are reduced.

[0010] In an alternative embodiment, the mixing assembly comprises a transverse static mixer and a longitudinal static mixer, the flow channels of the transverse static mixer and the flow channels of the longitudinal static mixer are arranged vertically, and the transverse static mixer and the longitudinal static mixer are both provided with a plurality of. The desalinated water mixed with the nitrogen gas enters the transverse static mixer and the longitudinal static mixer in sequence to continue mixing and other exchanges, thereby increasing the mixing degree of the nitrogen gas and the deoxygenated water and improving the oxygen removal efficiency.

[0011] In an alternative 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, increase the mixing degree of the nitrogen gas and the deoxygenated water, and optimize the oxygen removal quality.

[0012] In an alternative embodiment, a nitrogen gas atomizing disc is further installed in the mixing chamber, and the nitrogen gas atomizing disc is installed upstream of the mixing assembly. The nitrogen gas is atomized by the nitrogen gas atomizing disc and fully mixed with the desalinated water to reduce the difficulty of the nitrogen gas dissolving into the deoxygenated water and increase the nitrogen gas dissolution amount in the deoxygenated water.

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

[0014] In an alternative embodiment, the separation chamber comprises a primary separation chamber and a secondary separation chamber, the primary separation chamber is arranged between the mixing chamber and the secondary separation chamber, and 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 alternative embodiment, the inner diameter of the separation chamber is not less than twice the inner diameter of the desalinated water supply pipeline.

[0016] In an alternative embodiment, the desalted water storage tank is provided with an exhaust pipe, and a gas inlet branch is connected between the nitrogen supply pipe and the desalted water storage tank, which is adapted to introduce nitrogen into the desalted water storage tank to maintain the positive pressure in the desalted water storage tank to avoid air entering the desalted water storage tank to re-dissolve oxygen in the desalted water.

[0017] In an alternative embodiment, the nitrogen supply device comprises a nitrogen storage tank and a nitrogen generator, and the nitrogen generator is connected upstream of the nitrogen storage tank. The nitrogen generator can generate nitrogen with high purity to ensure the displacement ability of nitrogen to oxygen in the desalted water.

[0018] In an alternative embodiment, the nitrogen pressure in the nitrogen supply pipe is not less than twice the pressure of the desalted water in the desalted water supply pipe. By ensuring the nitrogen pressure, the nitrogen dissolving capacity in the deoxygenated water can be increased to improve the removal capacity of oxygen in the deoxygenated water. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed in the description of the specific embodiments or the prior art will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0020] Figure 1 The structural schematic diagram of the desalted water treatment system provided for the embodiments of the present application.

[0021] Figure 2 The structural schematic diagram of the deoxygenation device provided for the embodiments of the present application.

[0022] Legend of the drawings: 1, desalted water supply pipe; 2, inlet dissolved oxygen meter; 3, deoxygenation device; 4, outlet dissolved oxygen meter; 5, desalted water tank; 6, one-way exhaust valve; 7, gas pressure gauge; 8, nitrogen generator; 9, nitrogen storage tank; 10, nitrogen regulating valve; 11, gas inlet valve; 12, nitrogen supply pipe; 13, nitrogen atomizing disc; 14, transverse static mixer; 15, longitudinal 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 purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0024] The embodiments of the present application are described below with reference to Figure 1 and Figure 2 .

[0025] In a first aspect, the present application provides a desalted water treatment system for oxygen removal operation on prepared desalted water, and the desalted water treatment device comprises an oxygen removal device 3 and a nitrogen supply device.

[0026] One end of the oxygen removal device 3 is communicated with a desalted water supply pipeline 1, and the other end is communicated with a desalted water storage member. A mixing chamber and a separation chamber are arranged in the oxygen removal device 3. A mixing assembly is installed in the mixing chamber, and the inner diameter of the separation chamber is not less than that of the mixing chamber. The nitrogen supply device is communicated with the inlet end of the oxygen removal device 3 through a nitrogen supply pipeline 12, and the nitrogen supply device is adapted to continuously transport pressurized nitrogen to the inlet end of the oxygen removal device 3.

[0027] When the desalted water treatment system is in operation, pressurized nitrogen is introduced into the oxygen removal device 3 from the nitrogen supply device, and desalted water is transported into the oxygen removal device 3 through the desalted water supply pipeline 1. In the mixing chamber of the oxygen removal device 3, the nitrogen and the desalted water are fully mixed under the action of the mixing assembly. The fully mixed nitrogen and the desalted water enter the separation chamber, and the separation of the nitrogen and the desalted water is carried out under the action of gravity, inertia and expansion. The desalted water treatment system uses gas mixing exchange to replace the high-energy consumption steam thermal oxygen removal device, without adding toxic chemicals such as hydrazine, thereby reducing the operating cost of chemicals and being friendly to the staff and the environment. Moreover, the system is simple, the labor intensity and the influence of human factors are reduced. Compared with vacuum oxygen removal, the present application has no vacuum system and spraying system, low investment, simple device, high reliability, and the oxygen removal effect is better than that of vacuum oxygen removal. Compared with hollow fiber membrane oxygen removal, the present application has low initial investment, no easily damaged parts, low maintenance cost, easy operation, long-term stable operation and low operating cost. In summary, the present application has the characteristics of simple device, low initial investment, low operating and maintenance cost, good oxygen removal effect, environmental friendliness and easy operation compared with the traditional method.

[0028] The desalted water storage member can be a closed structure such as a water tank in some other embodiments. In order to measure the initial oxygen dissolution amount in the desalted water and the delivery flow rate 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 measure the oxygen dissolution amount of the desalted water stored in the desalted water storage member, an outlet dissolved oxygen meter 4 is installed on the pipeline between the deoxygenation device 3 and the desalted water storage member. In order to monitor and measure the air pressure in the desalted water storage member in real time, an air pressure meter 7 is installed on the desalted water storage member. In order to measure and control the flow rate, pressure and temperature of the nitrogen gas, a nitrogen gas flow meter 20, a nitrogen gas pressure meter 21, a nitrogen gas temperature meter 22 and a nitrogen gas regulating valve 10 are installed on the nitrogen gas supply pipeline.

[0029] In one embodiment, the mixing assembly includes transverse static mixers 14 and longitudinal static mixers 15, the flow channels of the transverse static mixers 14 are arranged perpendicularly to the flow channels of the longitudinal static mixers 15, and both the transverse static mixers 14 and the longitudinal static mixers 15 are provided in plurality. The desalted water mixed with the nitrogen gas enters the transverse static mixers 14 and the longitudinal static mixers 15 in sequence for further mixing and exchange, thereby increasing the mixing degree of the nitrogen gas and the 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, increase the mixing degree of the nitrogen gas and the deoxygenated water, and optimize the deoxygenation quality.

[0031] Further, a nitrogen gas atomizing disc 13 is installed in the mixing chamber upstream of the mixing assembly. The nitrogen gas is atomized by the nitrogen gas atomizing disc 13 and fully mixed with the desalted water, thereby reducing the difficulty of the nitrogen gas dissolving into the deoxygenated water and increasing the nitrogen gas dissolution amount in the deoxygenated water.

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

[0033] Specifically, the separation chamber includes 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. In this embodiment, in order to ensure that the nitrogen gas 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, the desalted water storage tank is provided with an exhaust pipeline, and a one-way exhaust valve 6 is installed on the exhaust pipeline to prevent external air from entering the desalted water storage tank. A nitrogen supply pipeline 12 is connected to the desalted water storage tank, and a gas inlet branch is provided between the nitrogen supply pipeline 12 and the desalted water storage tank. The gas inlet branch is adapted to introduce nitrogen into the desalted water storage tank to maintain a positive pressure in the desalted water storage tank to prevent air from entering the desalted water storage tank and causing oxygen to re-dissolve in the desalted water. In order to facilitate the control of the nitrogen in the gas inlet branch, a gas inlet valve 11 is installed on the gas inlet branch.

[0035] In one embodiment, the nitrogen supply device includes a nitrogen storage tank 9 and a nitrogen generator 8 connected upstream of the nitrogen storage tank 9. The nitrogen generator 8 can generate high-purity nitrogen to ensure the displacement ability of nitrogen to oxygen in the desalted water. In order to increase the amount of nitrogen dissolved in the deoxygenated water, 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. By ensuring the nitrogen pressure, the nitrogen dissolution capacity in the deoxygenated water can be increased, thereby improving the removal capacity of oxygen in the deoxygenated water.

[0036] In one embodiment, the desalted water treatment system provided by the present embodiment has a nitrogen generator 8 that generates nitrogen with a purity of greater than 99.99%, which is stored in a nitrogen storage tank and maintains a nitrogen pressure in the nitrogen supply pipeline 12 that is more than twice the operating pressure of the desalted water in the desalted water supply pipeline 1. Newly generated desalted water flows into the deoxygenation device 3 through the desalted water supply pipeline 1, and after measuring the desalted water flow and the dissolved oxygen content at the inlet of the deoxygenation device 3 through the desalted water flow meter 19 and the inlet dissolved oxygen meter 2, the desalted water enters the deoxygenation device 3. After entering the deoxygenation device 3, the nitrogen is atomized by the nitrogen atomizing disc 13 and fully mixed with the desalted water through the nitrogen supply pipeline 12. In order to increase the exchange time of nitrogen and oxygen and prevent the rapid separation of nitrogen and desalted water, the desalted water mixed with nitrogen enters the horizontal static mixer 14 and the vertical static mixer 15 for further gas exchange. The fully mixed nitrogen and desalted water enter the primary separation chamber 16, where they are preliminarily separated under the action of gravity, inertia and expansion, and then enter the secondary separation chamber 18, where the separated nitrogen and oxygen are collected in the upper part of the separation chamber and discharged through the exhaust valve 17.

[0037] After the exhaust valve 17 exhausts, a small part of nitrogen and oxygen which is not timely escaped enters the desalted water tank 5 with the desalted water, and under the action of gravity, the desalted water is collected below the desalted water tank 5, and nitrogen and oxygen are collected in the gas space above the desalted water tank 5, and the dissolved oxygen content in the desalted water is further reduced, when the pressure measured by the pressure gauge 7 is greater than 0.015 MPa, the one-way exhaust valve 6 exhausts to 0.015 MPa to stop, and at the same time, the oxygen in the air is prevented from entering the desalted water tank 5. When the desalted water in the desalted water tank 5 is extracted in a large amount, so that the pressure measured by the pressure gauge is lower than 0.010 MPa, in order to prevent air from entering the desalted water tank 5, the air inlet valve 11 installed on the air inlet branch of the desalted water tank 5 is opened, and nitrogen is filled into the desalted water tank 5 to stop at a pressure of 0.015 MPa.

[0038] In order to facilitate monitoring the flow, pressure and temperature of the nitrogen input into the deoxidizing device 3, a nitrogen flow meter 20, a nitrogen pressure gauge 21 and a nitrogen temperature gauge 22 are arranged on the ammonia gas supply pipeline, the nitrogen flow into the deoxidizing device 3 is adjusted by the nitrogen adjusting valve 10 according to the desalted water flow, 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 the embodiment also provides that when the desalted water is deoxidized, the new desalted water comes from the desalted water supply pipeline 1, the inlet dissolved oxygen content measured by the inlet dissolved oxygen meter 2 is C1 (unit: μg / L), the desalted water flow measured by the desalted water flow meter 19 is V1 (unit: m 3 / h), and the molar mass of oxygen is M (unit: g / mol), so that the amount of oxygen-containing moles in the desalted water flowing in the time t (unit: h) is n(O2) (unit: mol) as follows:

[0040]

[0041] When the desalted water flows into the deoxidizing device 3 through the desalted water supply pipeline 1, the nitrogen enters the deoxidizing device 3 through the nitrogen supply pipeline 12, the nitrogen flow measured by the nitrogen flow meter 20 is V2 (unit: m 3 / h), the nitrogen pressure measured by the nitrogen pressure gauge 21 is P (unit: Pa), the nitrogen temperature measured by the nitrogen temperature gauge 22 is T (unit: K), R is the molar gas constant (unit: J / (mol·K)), and the amount of nitrogen-containing moles in the desalted water flowing in the time t is n(N2) as follows:

[0042]

[0043] After the deoxygenation equipment 3, the dissolved oxygen content of the outlet is C2 (unit: μg / L), the oxygen content of the desalted water is reduced, because the gas solubility is proportional to the gas partial pressure, and is proportional to the molar volume of the gas at a certain temperature and pressure, so:

[0044]

[0045] According to the above formula, the nitrogen flow V2 is:

[0046]

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

[0048] The desalted water after deoxygenation treatment by the deoxygenation equipment 3 is stored in the desalted water tank 5, and the nitrogen and oxygen that do not escape in time through the exhaust valve 17 enter the upper gas space of the desalted water tank 5. The outlet flow of the desalted water tank 5 is 70 m 3 / h, the desalted water flow in the desalted water supply pipeline 1 is 100 m 3 / h, and the water inlet quantity of the desalted water tank 5 is greater than the water outlet quantity, causing the water level of the desalted water tank 5 to rise, the upper gas space of the desalted water tank 5 to decrease, and the one-way exhaust valve 6 to automatically exhaust to the outside of the desalted water tank 5 according to the pressure setting of the one-way exhaust valve 6, and stop when the internal pressure of the desalted water tank 5 is not greater than 0.015 Mpa. At the same time of discharging nitrogen and oxygen, oxygen in the air is prevented from entering the desalted water tank 5.

[0049] After the deoxygenation treatment of the desalted water is completed, the desalted water flow in the desalted water supply pipeline 1 is reduced to 0 m 3 / h, but the outlet flow of the desalted water tank 5 is still 70 m 3When the amount of water flowing into the desalted water tank 5 is less than the amount of water flowing out, the water level in the desalted water tank 5 rises, the gas space in the upper part of the desalted water tank 5 increases, and the pressure decreases. When the pressure is less than 0.010 MPa, the air inlet valve 11 on the air inlet branch of the desalted water tank 5 is opened to prevent air from entering the desalted water tank 5. Nitrogen is supplied from the nitrogen storage tank to the desalted water tank 5 until the pressure reaches 0.015 MPa, and then the supply of nitrogen is stopped, so that the desalted water tank 5 is in a positive pressure state sufficient to isolate air.

[0050] Although the embodiments of the present application are described in conjunction with the drawings, various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and changes are intended to fall within the scope of the appended claims.

Claims

1. A desalinated water treatment system, characterized by, The application relates to a device for removing oxygen from desalted water. The device comprises: an oxygen removal device (3) in communication with a desalted water supply pipeline (1) at one end and a desalted water storage at the other end, wherein a mixing chamber and a separation chamber are arranged in the oxygen removal device (3), a mixing assembly is arranged in the mixing chamber, and the inner diameter of the separation chamber is larger than that of the mixing chamber; a nitrogen supply device in communication with the inlet end of the oxygen removal device (3) through a nitrogen supply pipeline (12), and the nitrogen supply device is adapted to continuously supply pressurized nitrogen to the inlet end of the oxygen removal device (3); 2. The desalinated water treatment system of claim 1, wherein, the bottom of the separation chamber is arranged lower than the bottom of the mixing chamber, and when the deoxygenated water enters the separation chamber, the nitrogen in the deoxygenated water is separated from the deoxygenated water under the action of gravity, inertia and expansion due to the downward drop.

3. The desalinated water treatment system of claim 2, wherein, The mixing assembly comprises a transverse static mixer (14) and a longitudinal static mixer (15), the flow channel of the transverse static mixer (14) is arranged perpendicularly to the flow channel of the longitudinal static mixer (15), and a plurality of transverse static mixers (14) and longitudinal static mixers (15) are arranged.

4. The desalinated water treatment system according to any one of claims 1 to 3, wherein, The transverse static mixers (14) and the longitudinal static mixers (15) are arranged alternately.

5. The desalinated water treatment system according to any one of claims 1 to 3, wherein, A nitrogen atomizing disc (13) is further arranged in the mixing chamber and is arranged upstream of the mixing assembly.

6. The desalinated water treatment system of claim 5, wherein, 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 arranged on the pressure relief protrusion.

7. The desalinated water treatment system according to any one of claims 1 to 3, wherein, The inner diameter of the separation chamber is not less than twice the inner diameter of the desalted water supply pipeline (1).

8. The desalinated water treatment system according to any one of claims 1 to 3, wherein, An exhaust pipeline is arranged on the desalted water storage, an air inlet branch is in communication between the nitrogen supply pipeline (12) and the desalted water storage, and the air inlet branch is adapted to introduce nitrogen into the desalted water storage to maintain the inner cavity of the desalted water storage in a positive pressure state.

9. The desalinated water treatment system according to any one of claims 1 to 3, wherein, The nitrogen supply device comprises a nitrogen storage tank (9) and a nitrogen generator (8), and the nitrogen generator (8) is arranged upstream of the nitrogen storage tank (9). The nitrogen pressure in the nitrogen supply pipeline (12) is not less than twice the desalted water pressure in the desalted water supply pipeline (1).

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