CN114920315B - Deoxidizing device, deoxidizing system and water treatment method thereof - Google Patents
Deoxidizing device, deoxidizing system and water treatment method thereof Download PDFInfo
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- CN114920315B CN114920315B CN202210573271.0A CN202210573271A CN114920315B CN 114920315 B CN114920315 B CN 114920315B CN 202210573271 A CN202210573271 A CN 202210573271A CN 114920315 B CN114920315 B CN 114920315B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
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Abstract
The invention relates to an oxygen removal device, an oxygen removal system and a water treatment method thereof, wherein the oxygen removal device comprises a first oxygen removal module and a second oxygen removal module, the first oxygen removal module comprises a plurality of groups of oxygen removal films, and the plurality of groups of oxygen removal films are connected in series through pipelines; the second deoxidization module comprises at least one group of deoxidization films, and the first deoxidization module is connected with the second deoxidization module through a pipeline provided with an isolation valve. The invention utilizes the film deoxidizing device to replace the steam thermal deoxidizing device with complex process to remove the energy produced after high energy consumption, and eliminates the intermediate links with high failure rate to save the high deoxidizing cost of the nuclear power plant.
Description
Technical Field
The invention belongs to the technology of water chemical treatment in a nuclear power plant, and particularly relates to an oxygen removal device, an oxygen removal system and a water treatment method using the oxygen removal system.
Background
The auxiliary water supply system is a backup of the normal water supply system, and supplies water to the secondary side of the steam generator when the main water supply system is lost. The auxiliary water supply pool is filled with water or supplemented with water by using a condensate pump of the condensate extraction system preferentially. If the thermal shutdown time exceeds 8 hours, the normal water storage capacity of the auxiliary water supply tank cannot meet the requirement, and the valve of the system is required to be closed and is switched to be put into the thermal deaerator.
The first water filling of the reactor boron and water replenishing tank is the nuclear island desalted water treated by the auxiliary water supplying system thermal deaerator, and the desalted deoxidized water from the boron recovery system is replenished when the power station operates.
The thermal deaerator pipe system has complex design, needs auxiliary steam, needs multiple power supplies for supporting and has complex operation condition. When the operation is needed, the deaerator is filled with water to a normal water level under the air coverage, and steam enters the tube bundle to heat the water. When the pressure at the top of the deaerator reaches 0.12MPa, the flow controller drives the steam inlet regulating valve to be fully opened. When the water temperature reaches 105 ℃ which is rated for the water temperature, but still the water is not completely deoxidized, so that the water needs to be recycled for about 5 times to achieve the deoxidization effect, and qualified desalting deoxidization water can be provided at the moment; in addition, a steam flow is required in the deaerator to dilute and sweep the non-condensable materials. After production is completed, the steam side of the tube bundle needs to be under a nitrogen blanket to ensure optimal maintenance conditions during long-term shutdown. Because the steam is used for deoxidizing, the deoxidized water has higher temperature, and a regeneration heat exchanger is required to be arranged for cooling before the deoxidized water is discharged to a water tank. The thermal deaerator is filled with water of pH7 when in a standby state so as to meet the requirements of a boron and water supply system of a reactor, and when a power station is shut down or before restarting, the deaerator is required to operate with water of pH9 so as to meet the requirements of an auxiliary water supply system. No drainage and flushing is required when pH9 water is used instead of pH7 water, and careful drainage and flushing is required in deaerators to prevent contamination of the reactor boron and water make-up system water when pH7 feed water is restored.
In the operation feedback of a business owner, the floating roof design of the reactor boron and water supply system make-up water tank has a plurality of problems, such as easy rollover, rubber aging, poor sealing effect, easy reoxygenation, large maintenance difficulty, long period and the like. The desalting and deoxidizing water in the make-up water tank is generally directly discharged after reoxygenation, and the cost of the desalting and deoxidizing water is higher, so that more waste is caused; the thermal deaerator is positioned in a conventional island turbine factory building, the auxiliary water supply tank, the reactor boron and the water make-up water tank are positioned in the nuclear island, and the pipeline trend is far.
Disclosure of Invention
The invention aims to solve the problems of complex process, poor sealing effect, easy reoxygenation, high maintenance difficulty and long deoxidization period in the deoxidization process of the traditional nuclear power plant, and provides a deoxidization device, a deoxidization system using the deoxidization device and a water treatment method thereof.
The technical scheme of the invention is as follows: the utility model provides an deoxidization device, includes first deoxidization module and second deoxidization module, first deoxidization module contains multiunit deoxidization membrane, multiunit deoxidization membrane passes through the pipeline and establishes ties, the second deoxidization module contains at least a set of deoxidization membrane, through the pipeline connection that is equipped with isolation valve between first deoxidization module and the second deoxidization module.
Further, the deoxidizing device as described above, wherein the first deoxidizing module and the second deoxidizing module are both disposed within the nuclear island plant.
Further, the oxygen removal device as described above, wherein the first oxygen removal module comprises at least three sets of oxygen removal membranes.
The deoxidization system adopting the deoxidization device comprises a boron water deoxidization unit and an auxiliary water supply deoxidization unit, wherein the boron water deoxidization unit comprises a first deoxidization module, the auxiliary water supply deoxidization unit comprises a second deoxidization module, and the boron water deoxidization unit and the auxiliary water supply deoxidization unit are connected through at least two pipelines.
Further, the deoxidization system comprises the boron water deoxidization unit, wherein the boron water deoxidization unit comprises a nuclear island desalted water distribution system, a first pipeline and a second pipeline, the first pipeline is provided with an isolation valve, the nuclear island desalted water distribution system is connected with an inlet of the first deoxidization module through the first pipeline, and an outlet of the first deoxidization module is connected with a user through the second pipeline.
Further, the deaeration system as described above, wherein the auxiliary feedwater deaeration unit comprises a conventional island deaeration water distribution system, an auxiliary water supply tank, a third pipeline provided with an isolation valve, and a fourth pipeline, the conventional island deaeration water distribution system is connected with an inlet of the second deaeration module through the third pipeline, and an outlet of the second deaeration module is connected with an inlet of the auxiliary water supply tank through the fourth pipeline.
Still further, the first pipeline is connected with the third pipeline through a pipeline, the second pipeline is connected with the fourth pipeline through a pipeline, and an isolation valve and a one-way check valve are respectively arranged on the pipelines for connection.
Further, the deoxidizing system as described above, wherein the boron water deoxidizing unit further comprises a boron water make-up tank, the boron water make-up tank being disposed on the second pipeline.
Still further, the export of the supplementary feed tank of boron water with first pipeline connection, the export of supplementary feed tank with the third pipeline connection.
When the deoxidization system does not contain the boron water make-up water tank, the water treatment method adopting the deoxidization system comprises the following steps:
when a boron water supply system needs to provide desalted and deoxidized water for a user, a first deoxidizing module in the deoxidizing device is used for treating desalted water from a nuclear island;
when the water quantity of the auxiliary water supply pool is insufficient, a second deaeration module in the deaeration device is used for treating desalted water from a conventional island;
when the oxygen content of the water quality of the auxiliary water supply pool exceeds the standard, the second deoxidizing module in the deoxidizing device is used for treating the water of the auxiliary water supply pool.
Still further, treating demineralized water from the nuclear island using a first oxygen removal module in the oxygen removal device further comprises: closing an isolation valve arranged on a connecting pipe of the first pipeline and the third pipeline, closing an isolation valve arranged on a connecting pipe of the second pipeline and the fourth pipeline, and opening the isolation valves arranged on the first pipeline and the second pipeline;
treating desalinated water from a conventional island using a second oxygen removal module in the oxygen removal device further comprises: closing an isolation valve arranged on a connecting pipe of the first pipeline and the third pipeline, closing an isolation valve arranged on a connecting pipe of the second pipeline and the fourth pipeline, and opening isolation valves arranged on the third pipeline and the fourth pipeline;
using a second oxygen removal module in the oxygen removal device to treat water of a secondary water supply tank further includes: closing an isolation valve arranged on a connecting pipe of the first pipeline and the third pipeline, closing an isolation valve arranged on a connecting pipe of the second pipeline and the fourth pipeline, and opening isolation valves arranged on the third pipeline and the fourth pipeline.
When the deoxidization system contains the boron water make-up water tank, the water treatment method adopting the deoxidization system comprises the following steps:
when the water quality oxygen content of the water needed by the boron water replenishing system and the boron water replenishing water tank exceeds the standard or the water quantity of the boron water replenishing water tank is insufficient, a first deoxidizing module in the deoxidizing device is used for treating desalted water from a nuclear island or water from the boron water replenishing water tank;
when the water quantity of the auxiliary water supply tank is insufficient or the oxygen content of the water quality of the auxiliary water supply tank exceeds the standard, the second deoxidizing module in the deoxidizing device is used for treating the desalted water from the conventional island or the water of the auxiliary water supply tank.
Still further, treating demineralized water from a nuclear island or water from a boron water make-up tank using a first oxygen removal module in the oxygen removal device further comprises: closing an isolation valve arranged on a connecting pipe of the first pipeline and the third pipeline, closing an isolation valve arranged on a connecting pipe of the second pipeline and the fourth pipeline, and opening the isolation valves arranged on the first pipeline and the second pipeline;
treating water from a normal island demineralized water or auxiliary water supply tank using a second oxygen removal module in the oxygen removal device further comprises: closing an isolation valve arranged on a connecting pipe of the first pipeline and the third pipeline, closing an isolation valve arranged on a connecting pipe of the second pipeline and the fourth pipeline, and opening isolation valves arranged on the third pipeline and the fourth pipeline.
When the water flow which needs to be supplemented to the auxiliary water supply pool exceeds 60T/h, the first deaerating module and the second deaerating module in the deaerating device are used for deaerating.
The beneficial effects of the invention are as follows:
according to the deoxidizing device, the deoxidizing system and the water treatment method using the deoxidizing system, on one hand, the film deoxidizing device is used for replacing a steam thermal deoxidizing device with complex process, and the high energy consumption and the backward energy production are removed; the complicated deoxidizing operation of the thermal deoxidizer is reduced; the desalted water with different pH values is treated separately, and repeated flushing after cross use is not needed; the device no longer needs nitrogen injection protection when not in use. On the other hand, if the boron water replenishing water tank is canceled or the rubber floating roof of the boron water replenishing water tank is canceled, the intermediate link with high failure rate can be eliminated.
In addition, in the traditional nuclear power plant, the thermal deaerator is arranged in a conventional island, two users are arranged in the nuclear island, desalted water from a desalted water system of the nuclear island is required to be conveyed to the conventional island for treatment and then conveyed to the nuclear island, the way is far, and the failure rate is high. The deaeration device is arranged on the nuclear island, even if the auxiliary water supply fails when being conveyed from the conventional island to the nuclear island, the deaeration working condition of the auxiliary water supply is relatively low, and even if the deaeration device is lost, the fire water can be used as an emergency water source, so that the deaeration device is changed from the conventional island to the nuclear island, and the reliability is improved.
The invention correspondingly reduces the hardware investment and the operation cost. The economic improvement in the operation process of the nuclear power plant is mainly characterized by no reoxygenation and demineralized water discharge and energy consumption saving. According to the operation feedback, the operation cost of each unit in each refueling period is saved by about 12 ten thousand yuan according to the preliminary estimation of 18 yuan/ton of desalted and deoxidized water, 1 yuan/kWh of electricity charge and 280 yuan/ton of steam charge, and the total operation cost of each unit in the life period is 720 ten thousand yuan.
Drawings
FIG. 1 is a schematic diagram of an oxygen removal device according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a first oxygen scavenging system according to an embodiment of the invention;
FIG. 3 is a schematic diagram of a second oxygen scavenging system according to an embodiment of the invention.
In the figure, 1: an oxygen removal device;
100: a first oxygen removal module;
101: a second oxygen removal module;
1A, 1B, 1C, 1D are oxygen scavenging films;
LP, in situ pressure gauge;
MD, online flowmeter;
RBM, reactor boron and water make-up system;
WCD (WCD): a conventional island demineralized water distribution system;
WND: a nuclear island demineralized water distribution system;
pump a and pump B: a circulation pump;
221. 222, 331, 332, 141, 151, 261, 262, 263, 371, and 421, 422, 531, 532, 241, 251, 571: an isolation valve;
142. 152, 372, 242, 252, 572: a one-way check valve;
264 and 464: a regulating valve;
s21, S41, a first pipeline;
s22, S42, a second pipeline;
s31, S51, a third pipeline;
s32, S52; a fourth pipeline;
s23, a fifth pipeline;
s33, a sixth pipeline.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Example 1
The embodiment provides an oxygen removal device for keeping the dissolved oxygen content of a water tank of a nuclear power plant, wherein most of the time in the oxygen removal process, desalted water from a nuclear island is provided with desalted and deoxidized water for a boron water supplementing system after passing through the oxygen removal device; the auxiliary water supply pool of the nuclear island can also be supplemented with water by treating demineralized water from the conventional island.
The structure of the deoxidizing device 1 disclosed in this embodiment is shown in fig. 1, the deoxidizing device 1 is shown in a dashed frame in fig. 1, and includes a first deoxidizing module and a second deoxidizing module, wherein the first deoxidizing module includes three groups of deoxidizing films, 1A, 1B and 1C respectively, and the three groups of deoxidizing films are connected in series through pipelines; the second oxygen scavenging module contains a set of oxygen scavenging films 1D.
In the embodiment of the disclosure, the deoxidizing films 1A, 1B and 1C of the first deoxidizing module of the deoxidizing device are connected in series through a pipeline, the inlet of the deoxidizing film 1C is connected with desalted water from the nuclear island through the pipeline, and then the desalted water is deoxidized in the deoxidizing films 1C, 1B and 1A in sequence and enters a user of the reactor boron water replenishing system or the reactor boron water replenishing water tank through an outlet pipeline connected with the deoxidizing film 1A. The inlet of the deoxidizing film 1D in the second deoxidizing module of the deoxidizing device is connected with desalted water from a conventional island through a pipeline, deoxidized water is deoxidized in the deoxidizing film 1D, and the deoxidized water enters the auxiliary water supply tank through an outlet pipeline connected with the deoxidizing film 1D. The first deoxidization module and the second deoxidization module are both arranged in the nuclear island factory building. The treatable flow rate of the first deoxidizing module is 45t/h, and the oxygen content after treatment is lower than 100ppb and can reach 20ppb. The treatable flow rate of the second deoxidizing module is 15t/h, and the oxygen content after treatment is lower than 100ppb and can reach 20ppb. The first deoxidization module and the second deoxidization module are separately used for respectively treating water with different pH values, so that the water is not mixed, and maintenance and replacement can be reduced.
In the disclosed embodiments, nitrogen purge and evacuation lines are connected to the inlet and outlet of oxygen scavenging films 1A, 1B, 1C, 1D, respectively, to facilitate oxygen scavenging or for cleaning the oxygen scavenging films.
In the embodiment of the disclosure, the desalted water with different pH values is treated separately, and repeated flushing after cross use is not needed; the device no longer needs nitrogen injection protection when not in use. On the other hand, the boron water replenishing water tank or the rubber floating roof of the boron water replenishing water tank can be canceled, and the intermediate link with high failure rate is eliminated. After deoxidizing the deoxidized water from the nuclear island and the desalted water from the conventional island by the deoxidizing apparatus 1 of this embodiment, the oxygen content of the water can be controlled to be lower than 100ppb. The membrane deaerator and the matched circulating pump are adopted to replace the thermal deaerator and the matched steam supply facilities in the prior art, so that the engineering cost can be saved by 160 ten thousand yuan at least.
Example two
The embodiment discloses an oxygen removal system, as shown in fig. 2, comprising an oxygen removal device 1, a boron water oxygen removal unit 2 and an auxiliary water supply oxygen removal unit 3 (as shown in a dashed line frame in fig. 2) in embodiment 1, wherein the boron water oxygen removal unit 2 comprises a nuclear island demineralized water distribution system WND, a first pipeline S21, a second pipeline S22 and a boron water make-up water tank. In an embodiment of the present disclosure, a boron water make-up tank includes a reactor boron and water make-up system (RBM) make-up tank. The nuclear island demineralized water distribution system WND is connected with an inlet of the first deaeration module 100 in the deaeration apparatus 1 through a first pipeline S21, and an outlet of the first deaeration module 100 is connected with a user through a second pipeline S22. The RBM make-up tank is disposed on the second line S22.
In the disclosed embodiment, the auxiliary feedwater deoxygenation unit 3 includes a conventional island demineralized water distribution system WCD, an auxiliary feedwater tank, a third line S31, and a fourth line S32. The conventional island demineralized water distribution system WCD is connected with the inlet of the second deaeration module 101 in the deaeration apparatus 1 through a third pipeline S31, and the outlet of the second deaeration module 101 in the deaeration apparatus 1 is connected with the inlet of the auxiliary water supply tank through a fourth pipeline S32.
In the embodiment of the disclosure, the first pipeline S21 is connected with the third pipeline S31 through a pipeline, and an isolation valve 141 and a one-way check valve 142 are arranged on the pipeline; the third pipeline S22 and the fourth pipeline S32 are connected through pipelines, and an isolation valve 151 and a one-way check valve 152 are arranged on the pipelines. Isolation valves 221, 222, 331, 332 are provided on the first line S21, the second line S22, the third line S31, and the fourth line S32, respectively.
In the disclosed embodiment, the auxiliary feedwater deoxygenation unit 3 further includes a sixth line S33 and the boron water deoxygenation unit 2 further includes a fifth line S23. The outlet of the RBM makeup tank is connected with the first pipeline S21 through a fifth pipeline S23, and the outlet of the auxiliary water supply tank is connected with the third pipeline S31 through a sixth pipeline S33. The line S23 and the line S33 are provided with a circulation pump B and a circulation pump a, respectively.
In the disclosed embodiment, the pipeline S22 includes two branch pipelines, on which an RBM boric acid pump and an RBM water supplementing pump are respectively arranged.
The embodiment of the disclosure also discloses a water treatment method applying the deoxidization system, which has the following operation conditions:
working condition 1, primary water filling of a boron water make-up tank:
when the power station is started and the boron water supplementing water tank is filled with water for the first time, the isolation valves 141 and 151 are used for isolating the second deoxidizing module 101 from the deoxidizing device 1, the isolation valves 221 and 222 are opened, the nuclear island desalting water pump is used for conveying the nuclear island desalting water to the deoxidizing device 1, the first deoxidizing module 100 is used for deoxidizing, and the desalting deoxidizing water is conveyed to the RBM supplementing water tank. The circulation pump B and its valve 161 on the line are then opened based on the oxygen level in the tank to control the oxygen level below the target value.
Working condition 2, standby water supplementing of a boron water supplementing water tank:
in the operation process of the power station, when the water quantity of the boron water replenishing tank is insufficient due to the failure of the boron recovery system and the like, the boron water replenishing tank is supplied with standby water. Isolation valves 141 and 151, deoxygenation device 1 isolates second deoxygenation module 101, opens isolation valves 221 and 222, uses the nuclear island desalination water pump to deliver nuclear island desalination water to deoxygenation device 1, deoxygenates through first deoxygenation module 100, and delivers desalination deoxygenation water to the RBM make-up water tank. And then opening the valve on the circulating pump B and the pipeline thereof according to the oxygen content in the water tank, and controlling the oxygen content to be lower than a target value.
Working condition 3, exceeding the standard of oxygen content of the water quality of the boron water make-up tank:
when the power station operates, water is delivered from the water tank by using the boron water replenishing pump according to the requirements of users such as a loop or a main pump seal, and the boron water is mixed with boric acid provided by the boric acid pump and then is controlled by the regulating valve to be provided for a target user. If the oxygen content of the water exceeds the standard, a valve on the circulating pump B and a pipeline thereof is opened, and the oxygen content is controlled to be lower than the target value.
Working condition 4, water supplementing of an auxiliary water supply tank:
the primary water filling and the normal water supplementing of the auxiliary water supply tank come from a conventional island condensed water extraction system, if a power station is shut down, desalted water with the PH of 9 from a conventional island desalted water system is used when the water quantity of the auxiliary water supply tank is insufficient, and the auxiliary water supply tank is supplemented by the deoxidizing device 1. In emergency, normal island desalted water without deoxidization or fire water can be directly used for supplementing water for the auxiliary water supply pool.
The deaerating device 1 isolates the first deaerating module 100, isolates the valves 141 and 151, opens the isolating valves 131 and 132, uses a conventional island desalination water pump to deliver the conventional island desalination water to the deaerating device, deaerates the deaerating water through the second deaerating module, and delivers the desalination deaerated water to the auxiliary water supply tank.
Working condition 5, wherein the oxygen content of the water quality of the auxiliary water supply pool exceeds the standard:
the upper part of the water body of the auxiliary water supply pool is covered with nitrogen for preventing water quality reoxygenation. If the oxygen content exceeds the standard, the circulating pump A and valves on the pipeline are opened, and the oxygen content is controlled to be lower than the target value.
Working condition 6, emergency water supplementing of auxiliary water supply pool:
if a large flow is required to emergently replenish water to the auxiliary water supply tank, for example, the water replenishing flow exceeds 60T/h, opening the isolation valves 141 and 151, 131 and 132, and simultaneously putting the first deoxygenation module 100 and the second deoxygenation module 101 into operation; after the water replenishment is completed, all valves are closed, and the first oxygen removal module 100 is replaced with an oxygen removal membrane.
The deoxygenation system and the water treatment method using the same in the embodiment of the disclosure replace a thermal deoxygenator and a matched steam supply facility in the prior art by adopting a membrane deoxygenator and a matched circulating pump, so that the engineering cost can be saved by 160 ten thousand yuan at least.
Example III
The structure of the oxygen scavenging system in an embodiment of the present disclosure is shown in fig. 3. Comprises an oxygen removal device 1 in the embodiment 1, a boron water oxygen removal unit 4 and an auxiliary water oxygen removal unit 5 (shown by a dotted line box in fig. 3). The structure of the auxiliary water supply deoxidizing unit 5 is the same as that of the auxiliary water supply deoxidizing unit 3 included in the deoxidizing system in the second embodiment, and will not be described herein. The boron water deoxidizing unit 4 includes a nuclear island demineralized water distribution system WND, a first line S41 and a second line S42, but does not contain a boron water make-up tank. The nuclear island demineralized water distribution system WND is connected to an inlet of a first deaeration module 100 in the deaeration apparatus 1 via a first line S41, and an outlet of the first deaeration module 100 is connected to a user via a second line S42.
The embodiment of the disclosure also discloses a water treatment method applying the deoxidization system, which has the following operation conditions:
operating mode 1, the boron water supply system needs to provide desalted and deoxidized water for users:
Working condition 2, auxiliary water supply pool water supplementing:
the primary water filling and the normal water supplementing of the auxiliary water supply tank come from a conventional island condensed water extraction system, if a power station is shut down, desalted water with the PH of 9 from a conventional island desalted water system is used when the water quantity of the auxiliary water supply tank is insufficient, and the auxiliary water supply tank is supplemented with water through an deoxidizing unit. In emergency, normal island desalted water without deoxidization or fire water can be directly used for supplementing water for the auxiliary water supply pool.
The deaerating device isolates the first deaerating module 100, isolates the valves 241 and 251, opens the isolating valves 531 and 532, uses a conventional island desalination water pump to deliver the conventional island desalination water to the deaerating device, deaerates the deaerated water through the second deaerating module 101, and delivers the desalination and deaeration water to the auxiliary water supply tank.
Working condition 3, the oxygen content of the water quality of the auxiliary water supply pool exceeds the standard
The upper part of the water body of the auxiliary water supply pool is covered with nitrogen for preventing water quality reoxygenation. If the oxygen content exceeds the standard, the circulating pump A and valves on the pipeline are opened, and the oxygen content is controlled to be lower than the target value.
Working condition 4, emergency water replenishing of auxiliary water supply pool
If a high flow of emergency make-up water to the auxiliary water supply tank is required, for example, the make-up water flow exceeds 60T/h, the isolation valves 241 and 251, 531 and 532 are opened and the first oxygen removal module 100 and the second oxygen removal module 101 are simultaneously commissioned. After the water replenishment is completed, all valves are closed, and the first oxygen removal module 100 is replaced with an oxygen removal membrane.
The deoxidization system and the water treatment method using the deoxidization system in the embodiment of the disclosure have great improvement on economy. The hardware investment is 1560 ten thousand, and the running cost is 720 ten thousand. The cost savings are shown in the following table.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (6)
1. The system comprises a boron water deoxidization unit and an auxiliary water supply deoxidization unit, and is characterized in that the boron water deoxidization unit comprises a first deoxidization module, the auxiliary water supply deoxidization unit comprises a second deoxidization module, and the boron water deoxidization unit and the auxiliary water supply deoxidization unit are connected through at least two pipelines; the first deoxidization module and the second deoxidization module are both arranged in the nuclear island factory building, the first deoxidization module comprises a plurality of groups of deoxidization films, the plurality of groups of deoxidization films are connected in series through pipelines, the second deoxidization module comprises at least one group of deoxidization films, and the first deoxidization module and the second deoxidization module are connected through a pipeline provided with an isolation valve;
the boron water deoxidization unit comprises a nuclear island desalted water distribution system, a first pipeline and a second pipeline, wherein the first pipeline is provided with an isolation valve, the nuclear island desalted water distribution system is connected with an inlet of the first deoxidization module through the first pipeline, and an outlet of the first deoxidization module is connected with a user through the second pipeline;
the auxiliary water supply deoxygenation unit comprises a conventional island demineralized water distribution system, an auxiliary water supply tank, a third pipeline and a fourth pipeline, wherein the third pipeline and the fourth pipeline are provided with isolation valves, the conventional island demineralized water distribution system is connected with an inlet of a second deoxygenation module through the third pipeline, and an outlet of the second deoxygenation module is connected with an inlet of the auxiliary water supply tank through the fourth pipeline;
the first pipeline is connected with the third pipeline through a pipeline, the second pipeline is connected with the fourth pipeline through a pipeline, and an isolation valve and a one-way check valve are respectively arranged on the pipelines for connection.
2. The oxygen scavenging system of claim 1, wherein the first oxygen scavenging module comprises at least three sets of oxygen scavenging films.
3. The oxygen scavenging system of claim 1, wherein the boron water scavenging unit further comprises a boron water make-up tank disposed on the second line; and an outlet of the boron water supplementing water tank is connected with the first pipeline, and an outlet of the auxiliary water supply tank is connected with the third pipeline.
4. A water treatment process employing the oxygen scavenging system of claim 1 or 2, comprising:
when a boron water supply system needs to provide desalted and deoxidized water for a user, a first deoxidizing module in the deoxidizing system is used for treating desalted water from a nuclear island; closing an isolation valve arranged on a connecting pipe of the first pipeline and the third pipeline, closing an isolation valve arranged on a connecting pipe of the second pipeline and the fourth pipeline, and opening the isolation valves arranged on the first pipeline and the second pipeline;
when the water quantity of the auxiliary water supply pool is insufficient, a second deaeration module in the deaeration system is used for treating deaeration water from a conventional island; closing an isolation valve arranged on a connecting pipe of the first pipeline and the third pipeline, closing an isolation valve arranged on a connecting pipe of the second pipeline and the fourth pipeline, and opening isolation valves arranged on the third pipeline and the fourth pipeline;
when the oxygen content of the water quality of the auxiliary water supply pool exceeds the standard, a second deoxidizing module in the deoxidizing system is used for treating the water of the auxiliary water supply pool; closing an isolation valve arranged on a connecting pipe of the first pipeline and the third pipeline, closing an isolation valve arranged on a connecting pipe of the second pipeline and the fourth pipeline, and opening isolation valves arranged on the third pipeline and the fourth pipeline.
5. A method of water treatment employing the oxygen scavenging system of claim 3, comprising:
when the water quality oxygen content of the water needed by the boron water replenishing system and the boron water replenishing water tank exceeds the standard or the water quantity of the boron water replenishing water tank is insufficient, a first deoxidizing module in the deoxidizing system is used for treating desalted water from a nuclear island or water from the boron water replenishing water tank; closing an isolation valve arranged on a connecting pipe of the first pipeline and the third pipeline, closing an isolation valve arranged on a connecting pipe of the second pipeline and the fourth pipeline, and opening the isolation valves arranged on the first pipeline and the second pipeline;
when the water quantity of the auxiliary water supply tank is insufficient or the oxygen content of the water quality of the auxiliary water supply tank exceeds the standard, a second deoxidizing module in the deoxidizing system is used for treating the desalted water from the conventional island or the water of the auxiliary water supply tank; closing an isolation valve arranged on a connecting pipe of the first pipeline and the third pipeline, closing an isolation valve arranged on a connecting pipe of the second pipeline and the fourth pipeline, and opening isolation valves arranged on the third pipeline and the fourth pipeline.
6. A water treatment method adopting the deoxidizing system as claimed in any one of claims 1 to 3, characterized in that when the water flow rate required to be supplemented to the auxiliary water supply tank exceeds 60T/h, the first deoxidizing module and the second deoxidizing module in the deoxidizing system are used for deoxidizing simultaneously.
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