CN219009966U - Water source deoxidization system of nuclear power station main system - Google Patents

Abstract

The application provides a nuclear power plant main system water source deoxidization system, including first filter unit, second filter unit, deoxidization unit, third filter unit and fourth filter unit, the second filter unit sets up on the flow path between first filter unit and deoxidization unit, and the third filter unit sets up on the flow path between deoxidization unit and fourth filter unit, and first filter unit, second filter unit, deoxidization unit, third filter unit and fourth filter unit communicate in proper order, and the filtration grade of second filter unit is higher than the filtration grade of first filter unit, and the filtration grade of fourth filter unit is higher than the filtration grade of third filter unit. Can deoxidize the water source through setting up deoxidization unit to make the water source dissolve oxygen content reduction, avoid dissolving oxygen overrun's water and lead to the fact corruption to main system pipeline, equipment inner wall, can carry out filtration treatment when the water source deoxidization through setting up the filter unit simultaneously, improved the cleanliness factor of water source quality of water, and then improved deoxidization effect.

Description

Water source deoxidization system of nuclear power station main system

Technical Field

The application belongs to the technical field of nuclear power station reactor coolant systems, and particularly relates to a water source deoxidization system of a main system of a nuclear power station.

Background

During the operation of pressurized water reactor and boiling water reactor nuclear power station, the main control personnel can supplement deoxygenated water with high cleanliness to the reactor coolant system (main system for short) according to the state of the reactor, so as to achieve the purpose of controlling the reactivity. Because the main system is at high temperature and high pressure and is in a radioactive environment, if water with excessive dissolved oxygen is added, the pipelines and the inner walls of the equipment of the main system are corroded, radioactive oxidation corrosion products are gradually generated, and the safety of the reactor is endangered; if a large amount of impurities exist in the deoxidized water fed into the main system, the source item of the main system is increased, more radioactive corrosion products are generated, and the principle of minimizing waste is not facilitated.

Therefore, there is a need for a water source deoxygenation system for a nuclear power plant main system that filters and deoxygenates the water source replenished by the main system to obtain clean water with low dissolved oxygen, little or no impurities.

Disclosure of Invention

Therefore, the technical problem to be solved in the application is to provide a water source deoxidization system of a nuclear power station main system, which can filter and deoxidize a water source supplemented by a reactor cooling system so as to obtain clean water with low dissolved oxygen, few impurities or no impurities.

In order to solve the problem, the application provides a nuclear power plant main system water source deoxidization system, including first filter unit, second filter unit and deoxidization unit, the second filter unit sets up first filter unit with on the flow path between the deoxidization unit, first filter unit the second filter unit with deoxidization unit communicates in proper order, second filter unit's filtration grade is higher than first filter unit's filtration grade.

Optionally, the water source deoxidization system of the main system of the nuclear power station further comprises an air inlet pipe and an air outlet pipe, wherein the air inlet pipe and the air outlet pipe are respectively communicated with the deoxidization unit, the air inlet pipe is used for conveying gas to purge the deoxidization unit, and the air outlet pipe is used for discharging the gas and purged impurities.

Optionally, the gas is compressed air or nitrogen.

Optionally, the water source deoxidization system of the main system of the nuclear power station further comprises an air pump, wherein the air pump is arranged on the exhaust pipe and is used for continuously exhausting air from the deoxidization unit so that a negative pressure environment is formed inside the deoxidization unit.

Optionally, the water source deoxidization system of the nuclear power plant main system further comprises a third filtering unit, wherein the third filtering unit is communicated with the deoxidization unit, and the third filtering unit is arranged on the downstream side of the deoxidization unit along the flow path direction.

Optionally, the water source deoxidization system of the main system of the nuclear power plant further comprises a fourth filtering unit, wherein the fourth filtering unit is arranged on the downstream side of the third filtering unit along the flow path direction, and the fourth filtering unit is communicated with the third filtering unit.

Optionally, the filtration grade of the fourth filtration unit is higher than the filtration grade of the third filtration unit, and the filtration grade of the third filtration unit is higher than or equal to the filtration grade of the second filtration unit.

Optionally, the water source deoxidization system of the main system of the nuclear power station further comprises a water tank, wherein the water tank is arranged on the downstream side of the fourth filtering unit along the flow path direction, and the water tank is communicated with the fourth filtering unit.

Optionally, the water source deoxidization system of the main system of the nuclear power station further comprises a water pump, and the water pump is arranged on a connecting flow path between the water tank and the primary filtering unit.

Optionally, the deoxidizing unit is a multistage membrane deoxidizing device.

Advantageous effects

According to the water source deoxidization system of the nuclear power station main system, provided by the embodiment of the utility model, the deoxidization unit is arranged to deoxidize the water source supplemented by the reactor main system, so that the dissolved oxygen content of the water source is reduced, corrosion of the water supplemented with the excessive dissolved oxygen to the inner wall of a main system pipeline and equipment is avoided, and meanwhile, the first filtering unit and the second filtering unit are arranged to perform twice filtering treatment before deoxidizing the water source, so that impurities in the water source are removed, the cleanliness of the water quality of the water source is improved, the deoxidization effect is further improved, the source item of the main system is reduced, the minimization of waste is realized, the blockage of the impurities in the water is avoided, deoxidization equipment in the deoxidization unit is damaged, and the service life of the deoxidization unit is prolonged.

Drawings

Fig. 1 is a schematic diagram of a water source deoxidization system of a main system of a nuclear power plant according to an embodiment of the present application.

The reference numerals are expressed as:

1. a first filtering unit; 2. a second filtering unit; 3. a third filtering unit; 4. a fourth filtering unit; 5. an oxygen removal unit; 6. an air inlet pipe; 7. an exhaust pipe; 8. a water tank; 9. and (3) a water pump.

Detailed Description

In the description of the present application, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," etc. indicate or are based on the orientation or positional relationship shown in the drawings, merely for convenience of description and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

The preferred embodiments of the present utility model will be described below with reference to the accompanying drawings, it being understood that the preferred embodiments described herein are for illustration and explanation of the present utility model only, and are not intended to limit the present utility model.

Referring to fig. 1 in combination, according to an embodiment of the present application, there is provided a water source deoxidizing system of a main system of a nuclear power plant, including a first filter unit 1, a second filter unit 2 and a deoxidizing unit 5, wherein the second filter unit 2 is disposed on a flow path between the first filter unit 1 and the deoxidizing unit 5, the first filter unit 1, the second filter unit 2 and the deoxidizing unit 5 are sequentially communicated, and a filtration grade of the second filter unit 2 is higher than that of the first filter unit 1.

The oxygen removal unit 5 is arranged to remove oxygen from the water source fed into the reactor main system, so that the dissolved oxygen content of the water source is reduced, corrosion to the pipeline and the inner wall of the main system caused by the water fed into the reactor main system due to overrun of dissolved oxygen is avoided, and meanwhile, the first filtering unit 1 and the second filtering unit 2 are arranged to perform twice filtering treatment before the water source is used for removing impurities in the water source, so that the cleanliness of the water quality of the water source is improved, the oxygen removal effect is improved, the source item of the main system is reduced, the minimization of waste can be realized, the blockage of the impurities in the water can be avoided, the deoxidizing equipment in the oxygen removal unit 5 is damaged, and the service life of the oxygen removal unit 5 is prolonged.

Wherein, the second filter unit 2 sets up in the low reaches side of first filter unit 1 along the flow path direction, can carry out preliminary filtration to the large granule impurity in the water source through setting up first filter unit 1, can carry out secondary filtration to the tiny impurity in the water source through setting up second filter unit 2 to there is less or not impurity in the water source after making the filtration, provided the filter effect.

Specifically, the export of first filter unit 1 is linked together with the import of second filter unit 2, is provided with the stainless steel pipe between first filter unit 1 and the second filter unit 2 in this application embodiment, and the one end of stainless steel pipe is connected with first filter unit 1, and the other end is connected with second filter unit 2, and the clear water that waits to process gets into second filter unit 2 and carries out fine filtration after filtering through first filter unit 1 preliminary.

Wherein the filtration grade of the second filter unit 2 is greater than the filtration grade of the first filter unit 1.

Specifically, the first filter unit 1 is a primary filter, the radius of the filter particles is larger than or equal to 5 mu m, and the filter efficiency is 70-80%; the second filter unit 2 is a medium-efficiency filter, the radius of the filter particles is 1-5 mu m, and the filter efficiency is 60-95%.

Through setting up the filtration grade of second filter unit 2 and being greater than the filtration grade of first filter unit 1, can realize treating the clear water and can be successfully intercepted by second filter unit 2 through the impurity of first filter unit 1, improved the filter effect, can avoid impurity jam in the aquatic, damage deoxidization equipment in deoxidization unit 5, improved deoxidization unit 5's life, can avoid the frequent condition production of blockking up of too many filter units of impurity through setting up two filter units simultaneously, reduced the filter core change frequency of first filter unit 1.

Wherein, the filter core in first filter unit 1 and the second filter unit 2 can dismantle the setting to can change the filter core when making first filter unit 1 and the second filter unit 2 jam, improved the filter effect.

Wherein the outlet of the second filter unit 2 is in communication with the inlet of the oxygen removal unit 5.

Specifically, in the embodiment of the present application, the second filter unit 2 is disposed between the first filter unit 1 and the oxygen removal unit 5, that is, the oxygen removal unit 5 is disposed on the liquid discharge flow path of the second filter unit 2.

The deoxidization unit 5 is arranged on the downstream side of the second filtering unit 2 along the flow path direction, and can deoxidize a water source fed in by the reactor main system by arranging the deoxidization unit 5 so as to reduce the content of dissolved oxygen in the water source and avoid corrosion of the pipeline and the inner wall of the equipment of the main system caused by feeding in water with over-limit dissolved oxygen.

Specifically, deoxidizing devices are detachably arranged in the deoxidizing unit 5, a plurality of deoxidizing devices can be arranged, deoxidizing grades of the deoxidizing devices are different, and the deoxidizing devices are sequentially arranged from small to large in the flowing direction of the water source according to the deoxidizing grades.

Wherein, the clear water to be treated is filtered by the first filtering unit 1 for preliminary filtration, then enters the second filtering unit 2 for fine filtration, and then enters the deoxidizing unit 5 for deoxidization to form deoxidized water.

The water source deoxidization system of the nuclear power station main system further comprises an air inlet pipe 6 and an air outlet pipe 7, the air inlet pipe 6 and the air outlet pipe 7 are respectively communicated with the deoxidization unit 5, the air inlet pipe 6 is used for conveying gas to purge the deoxidization unit 5, and the air outlet pipe 7 is used for discharging gas and purging impurities.

Through setting up intake pipe 6 and blast pipe 7 respectively with deoxidization unit 5 be linked together, can realize providing high cleanliness factor gas to deoxidization unit 5 through intake pipe 6 and sweep the deoxidization equipment in the deoxidization unit 5 to make the impurity that sweeps the production discharge through blast pipe 7, improved deoxidization rate and deoxidization effect, can avoid impurity in the aquatic to block up, damage deoxidization equipment in the deoxidization unit 5 simultaneously, improved deoxidization unit 5's life.

Wherein, intake pipe 6 and blast pipe 7 are linked together with deoxidization unit 5, and in this embodiment, intake pipe 6 and blast pipe 7 can dismantle the setting on deoxidization unit 5.

The air inlet pipe 6 and the air outlet pipe 7 may be rubber hoses, etc., and are not limited in this application.

Specifically, the air inlet pipe 6 and the air outlet pipe 7 are respectively arranged at two ends of the deoxidizing unit 5, the air inlet pipe 6 is used for providing high-cleanliness gas for deoxidizing equipment in the deoxidizing unit 5 so as to purge impurities on the surface or in the deoxidizing equipment, and the air outlet pipe 7 is used for discharging impurities generated by purging of the deoxidizing unit 5,

The gas is compressed air or nitrogen.

Through setting up gas and sweeping deoxidizing unit 5, improved deoxidizing speed and deoxidizing effect, can avoid impurity jam in the aquatic simultaneously, damage deoxidizing equipment in deoxidizing unit 5, improved deoxidizing unit 5's life.

Specifically, the gas may be compressed air or nitrogen, and in this embodiment of the present application, the purge gas is preferably nitrogen, which is not easy to react with the substance chemically, and meanwhile, oxygen in the compressed air can be prevented from mixing in to increase the difficulty of deoxidization.

The water source deoxidization system of the main system of the nuclear power station further comprises an air pump, the air pump is arranged on the exhaust pipe 7 and is used for continuously exhausting the deoxidization unit 5, so that a negative pressure environment is formed inside the deoxidization unit 5.

Can bleed in succession deoxidization unit 5 through setting up the air pump to make purge gas and impurity discharge, improved and swept efficiency, can realize the inside negative pressure environment that forms of deoxidization unit 5 simultaneously, so that aqueous solution partial pressure process accelerates, improved the deoxidization rate.

Wherein the air pump is arranged on the exhaust pipe 7.

Specifically, the air pump can be dismantled with blast pipe 7 and be connected, can bleed in succession deoxidization unit 5 through setting up the air pump to make purge gas and impurity discharge, improved and swept efficiency, can realize deoxidization unit 5 inside formation negative pressure environment simultaneously, so that the aqueous solution partial pressure process is accelerated, improved deoxidization rate.

The water source deoxidization system of the nuclear power station main system further comprises a third filtering unit 3, the third filtering unit 3 is communicated with the deoxidization unit 5, and the third filtering unit 3 is arranged on the downstream side of the deoxidization unit 5 along the flow path direction.

Through setting up the impurity that the third filtration unit 3 can filter deoxidization aquatic, avoid mixing impurity in the water source and get into main system and cause main system pipeline, equipment inner wall to cause the corruption, improved main system operation's stability, can reduce main system source item simultaneously to reduce the radioactive corrosion product, can realize the waste minimization.

Wherein, the third filter unit 3 can be high-efficient filter etc., can carry out preliminary filtration to the large granule impurity in the deoxidized water through setting up the third filter unit 3.

Specifically, in the embodiment of the present application, the third filter unit 3 is a high-efficiency filter, and the radius of the filter particles is equal to or greater than 0.3 μm, and the filtration efficiency is equal to or greater than 99.97%.

Wherein the deoxidized water is clear water to be treated which is treated by the deoxidizing unit 5.

Wherein the outlet of the deoxygenation unit 5 is connected with the inlet of the third filtering unit 3.

Specifically, in this application embodiment, deoxidization unit 5 sets up between second filter unit 2 and third filter unit 3, namely third filter unit 3 sets up on deoxidization unit 5's liquid discharge flow path, can filter the impurity in the deoxidization water through setting up third filter unit 3, avoid mixing impurity in the water source and get into main system and cause main system pipeline, equipment inner wall to cause the corruption, improved main system operation's stability, can reduce main system source item simultaneously to reduce the radioactive corrosion product, can realize the waste minimization.

The clean water to be treated is subjected to primary filtration by the first filtering unit 1, then enters the second filtering unit 2 for fine filtration, then enters the deoxygenation unit 5 for deoxygenation to form deoxygenated water, and enters the third filtering unit 3 for primary filtration again.

The water source deoxidization system of the nuclear power station main system further comprises a fourth filtering unit 4, the fourth filtering unit 4 is arranged on the downstream side of the third filtering unit 3 along the flow path direction, and the fourth filtering unit 4 is communicated with the third filtering unit 3.

Through setting up fourth filter unit 4 can carry out secondary filtration to deoxidization water, improved the filter effect, further reduced the impurity in the water source, avoid mixing impurity in the water source and get into main system and cause main system pipeline, equipment inner wall to cause the corruption, improved the stability of main system operation, can reduce main system source item simultaneously to reduce the radioactive corrosion product, can realize the waste minimization.

Wherein, the fourth filter unit 4 can be ultra-efficient filter etc., can carry out fine filtration to the tiny impurity of deoxidized water through setting up the fourth filter unit 4 to there is less or not impurity in the deoxidized water after making the filtration, provided the filter effect.

Specifically, in the embodiment of the present application, the fourth filter unit 4 is an ultra-efficient filter, the radius of the filter particles is 0.1-0.3 μm, and the filtration efficiency is ≡ 99.995%.

Wherein the inlet of the fourth filter unit 4 communicates with the outlet of the third filter unit 3.

Specifically, in this application embodiment, third filter unit 3 sets up between deoxidization unit 5 and fourth filter unit 4, namely fourth filter unit 4 sets up on the liquid discharge flow path of third filter unit 3, can carry out secondary filtration to deoxidization water through setting up fourth filter unit 4, improved the filter effect, further reduced the impurity in the water source, avoid mixing impurity into in the water source and get into main system and cause main system pipeline, equipment inner wall and cause the corruption, improved the stability of main system operation, can reduce main system source item simultaneously, and reduce the radioactive corrosion product, can realize the waste minimization.

The clean water to be treated enters the second filtering unit 2 for fine filtration after being primarily filtered by the first filtering unit 1, then enters the deoxidizing unit 5 for deoxidization to form deoxidized water, the deoxidized water enters the third filtering unit 3 for primary filtration again, finally enters the fourth filtering unit 4 for fine filtration again, and then flows back to the water tank 8, so that the water circulation filtering and deoxidization in the water tank 8 can be realized, the cleanliness of a water source is further improved, and the oxygen content of the water source is reduced.

The fourth filter unit 4 has a higher filtration level than the third filter unit 3, and the third filter unit 3 has a filtration level higher than or equal to the filtration level of the second filter unit 2.

The filtering grade through the fourth filter unit 4 is greater than the filtering grade of the third filter unit 3, so that impurities passing through the third filter unit 3 in deoxygenated water can be successfully intercepted by the fourth filter unit 4, the filtering effect is improved, the cleanliness of pipelines and equipment in a main system is further improved, meanwhile, the condition that too many filter units of impurities are frequently blocked can be avoided by arranging two filter units, and the filter element replacement frequency of the third filter unit 3 is reduced.

Wherein, the filtration grade of the fourth filtration unit 4 is greater than the filtration grade of the third filtration unit 3, the filtration grade of the third filtration unit 3 is higher than or equal to the filtration grade of the second filtration unit 2, and the filtration grade of the second filtration unit 2 is higher than the filtration grade of the first filtration unit 1.

Specifically, the first filter unit 1 is a primary filter, the radius of the filter particles is larger than or equal to 5 mu m, and the filter efficiency is 70-80%; the second filter unit 2 is a medium-efficiency filter, the radius of the filter particles is 1-5 mu m, and the filter efficiency is 60-95%; the third filter unit 3 is a high-efficiency filter, the radius of the filter particles is larger than or equal to 0.3 mu m, and the filter efficiency is larger than or equal to 99.97%; the fourth filter unit 4 is an ultra-efficient filter, the radius of the filter particles is 0.1-0.3 mu m, the filter efficiency is larger than or equal to 99.995%, and impurities in the clear water to be treated can be filtered step by arranging the first filter unit 1, the second filter unit 2, the third filter unit 3 and the fourth filter unit 4, so that the filter effect is improved.

The water source deoxidization system of the nuclear power station main system further comprises a water tank 8, the water tank 8 is arranged on the downstream side of the fourth filtering unit 4 along the flow path direction, and the water tank 8 is communicated with the fourth filtering unit 4.

The water source deoxidization system of the main system of the nuclear power station further comprises a water pump 9, and the water pump 9 is arranged on a connecting flow path between the water tank 8 and the primary filtering unit.

The water pump 9 is arranged on the connecting pipeline between the water tank 8 and the primary filtering unit to provide a water source driving force for the running of the water source deoxidization system of the main system of the nuclear power station, so that the depth strength filtering and the depth forced deoxidization of the water tank 8 for supplementing water to the main system of the nuclear power station can be realized, the deoxidization and filtering effects are improved, the treated water quality meets the requirements of high cleanliness and low dissolved oxygen, and meanwhile, the source item of the deoxidized water with high cleanliness entering the main system of the nuclear power station is also reduced, and the minimization of radioactive wastes is facilitated.

Wherein, water pump 9 can set up different models according to the demand, does not do further limit this application.

Specifically, the water pump 9 is arranged on the connecting pipeline of the water tank 8 and the first filtering unit 1, and water source driving force can be provided for the running of the water source deoxidizing system of the nuclear power station main system by arranging the water pump 9, so that clean water to be treated can sequentially pass through the first filtering unit 1, the second filtering unit 2, the deoxidizing unit 5, the third filtering unit 3 and the fourth filtering unit 4 and then return to the water tank 8, a loop for filtering and deoxidizing the water source is formed, the circulating filtration and deoxidizing treatment for supplementing the water source to the nuclear power station reactor coolant system are realized, the treated water quality meets the requirements of high cleanliness and low dissolved oxygen, and meanwhile, the source item of the deoxidized water with high cleanliness entering the nuclear power station main system is also reduced, so that the minimization of radioactive waste is facilitated.

The deoxidizing unit 5 is a multistage membrane deoxidizing device.

The deoxidization effect of the water source deoxidization system of the main system of the nuclear power station is improved by arranging the deoxidization unit 5 to be a multi-stage film deoxidization device, so that the content of dissolved oxygen in the water source is reduced, and corrosion of the water filled with the excessive dissolved oxygen to the inner wall of the main system pipeline and equipment is avoided.

The deoxidization unit 5 can be a multistage membrane deoxidization device, and can deoxidize a water source supplemented by the reactor main system by arranging the deoxidization unit 5 so as to reduce the dissolved oxygen content of the water source and avoid corrosion of water supplemented with excessive dissolved oxygen to the inner wall of the main system pipeline and equipment.

Specifically, detachable deoxidizing devices are arranged in the deoxidizing unit 5, a plurality of deoxidizing devices can be arranged, the deoxidizing grades of the deoxidizing devices are different, and the deoxidizing grades of the deoxidizing devices can be sequentially arranged from small to large according to the flowing direction of the water source.

According to the water source deoxidization system of the nuclear power station main system provided by the embodiment of the utility model, the water pump 9 drives the water source in the water tank 8 to sequentially pass through the first filtering unit 1, the second filtering unit 2, the deoxidization unit 5, the third filtering unit 3 and the fourth filtering unit 4 and then return to the water tank 8 to form a loop for filtering and deoxidizing the water source, the deoxidization unit 5 is arranged to deoxidize the water source supplemented by the reactor main system, so that the dissolved oxygen content of the water source is reduced, corrosion of water supplemented with excessive dissolved oxygen to the inner wall of a main system pipeline and equipment is avoided, and meanwhile, the first filtering unit 1 and the second filtering unit 2 can carry out twice filtering treatment before deoxidizing the water source to remove impurities in the water source, so that the cleanliness of the water source is improved, the deoxidization effect is further improved, the source item of the main system is reduced, waste minimization is realized, meanwhile, the blockage of impurities in the water is avoided, the deoxidization equipment in the deoxidization unit 5 is prevented from being damaged, and the service life of the deoxidization unit 5 is prolonged.

It will be readily appreciated by those skilled in the art that the above advantageous ways can be freely combined and superimposed without conflict.

The foregoing description of the preferred embodiment of the present utility model is not intended to limit the utility model to the particular form disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the utility model. The foregoing is merely a preferred embodiment of the present application and it should be noted that it will be apparent to those skilled in the art that several modifications and variations can be made without departing from the technical principles of the present application, and these modifications and variations should also be regarded as the scope of the present application.

Claims (10)

1. The utility model provides a nuclear power plant main system water source deoxidization system, its characterized in that includes first filter unit (1), second filter unit (2) and deoxidization unit (5), second filter unit (2) set up first filter unit (1) with on the flow path between deoxidization unit (5), first filter unit (1) second filter unit (2) with deoxidization unit (5) communicate in proper order, the filtration grade of second filter unit (2) is higher than the filtration grade of first filter unit (1).

2. The water source deoxidization system of a nuclear power plant main system according to claim 1, further comprising an air inlet pipe (6) and an air outlet pipe (7), wherein the air inlet pipe (6) and the air outlet pipe (7) are respectively communicated with the deoxidization unit (5), the air inlet pipe (6) is used for conveying gas to purge the deoxidization unit (5), and the air outlet pipe (7) is used for discharging the gas and purged impurities.

3. The nuclear power plant primary system water source deoxygenation system of claim 2 wherein said gas is compressed air or nitrogen.

4. The water source deoxidization system of the main system of the nuclear power plant according to claim 2, further comprising an air pump, wherein the air pump is arranged on the exhaust pipe (7) and is used for continuously exhausting the deoxidization unit (5) so as to form a negative pressure environment inside the deoxidization unit (5).

5. The nuclear power plant main system water source deoxidization system according to claim 1, further comprising a third filter unit (3), wherein the third filter unit (3) is communicated with the deoxidization unit (5), and the third filter unit (3) is disposed on a downstream side of the deoxidization unit (5) in a flow path direction.

6. The nuclear power plant main system water source deoxidization system according to claim 5, further comprising a fourth filter unit (4), wherein the fourth filter unit (4) is disposed on a downstream side of the third filter unit (3) in a flow path direction, and the fourth filter unit (4) is in communication with the third filter unit (3).

7. The nuclear power plant main system water source deoxygenation system of claim 6 wherein the fourth filtration unit (4) has a higher filtration rating than the third filtration unit (3), the third filtration unit (3) having a filtration rating greater than or equal to the second filtration unit (2).

8. The nuclear power plant main system water source deoxidization system according to claim 7, further comprising a water tank (8), wherein the water tank (8) is disposed on a downstream side of the fourth filter unit (4) in a flow path direction, and the water tank (8) is in communication with the fourth filter unit (4).

9. The nuclear power plant main system water source deoxidization system of claim 8, further comprising a water pump (9), the water pump (9) being disposed on a connecting flow path between the water tank (8) and the first filter unit (1).

10. The water source deoxidization system of a nuclear power plant main system according to claim 1, wherein the deoxidization unit (5) is a multistage membrane deoxidization device.

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