CN114920315A - Deoxygenation device, deoxygenation system and water treatment method thereof - Google Patents
Deoxygenation device, deoxygenation system and water treatment method thereof Download PDFInfo
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- CN114920315A CN114920315A CN202210573271.0A CN202210573271A CN114920315A CN 114920315 A CN114920315 A CN 114920315A CN 202210573271 A CN202210573271 A CN 202210573271A CN 114920315 A CN114920315 A CN 114920315A
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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
- C02F2201/002—Construction details of the apparatus
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
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Abstract
The invention relates to a deoxidizing device, a deoxidizing system and a water treatment method thereof, wherein the deoxidizing device comprises a first deoxidizing module and a second deoxidizing module, the first deoxidizing module comprises a plurality of groups of deoxidizing films, and the groups of deoxidizing films are connected in series through pipelines; 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. The invention utilizes the membrane deoxygenation device to replace a steam thermal deoxygenation device with a complex process to remove high energy consumption lagging capacity, and eliminates a high failure rate intermediate link to save the high deoxygenation cost of a nuclear power plant.
Description
Technical Field
The invention belongs to the technology of chemical treatment of water in a nuclear power plant, and particularly relates to a deoxygenation device, a deoxygenation system and a water treatment method using the deoxygenation 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 tank is preferably filled with water or replenished with water by using a condensate pump of a condensate water extraction system. If the hot shutdown time exceeds 8 hours, the normal water storage capacity of the auxiliary water supply tank cannot meet the requirement, a valve of the system is required to be closed, and the system is switched to a thermal deaerator.
The first water filling of the reactor boron and water supply system make-up water tank is the nuclear island desalted water treated by the auxiliary water supply system thermal deaerator, and the desalted deaerated water from the boron recovery system is supplied when the power station operates.
The thermal deaerator has complex pipe system design, needs auxiliary steam, needs multiple power supplies for supporting and has complex operation condition. When the steam-water heater needs to be put into operation, the deaerator is filled with water to a normal water level under the condition of 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. At that time, the water temperature reaches 105 ℃ of the rated temperature, but the oxygen is not completely removed, so the water must be recycled for about 5 times to achieve the oxygen removal effect, and qualified desalted and deoxidized water can be provided at this time; in addition, a steam flow is required in the deaerator to dilute and sweep the non-condensable material. After production is complete, the steam side of the tube bundle needs to be under a nitrogen blanket to ensure optimal service conditions for long term shut downs. Because steam is used for deoxidization, the temperature of the deoxidized water is higher, and a regenerative heat exchanger needs to be arranged for cooling before the deoxidized water is discharged to a water tank. When the thermal deoxygenation device is in a standby state, the thermal deoxygenation device is filled with water with the pH of 7 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 thermal deoxygenation device is required to be operated by water with the pH of 9 so as to meet the requirements of an auxiliary water supply system. Water at pH7 was replaced with water at pH9 without draining and flushing, and the deaerator required careful draining and flushing to prevent contamination of the water storage of the reactor boron and water make-up system when restoring the feed water at pH 7.
In the operation feedback of a reactor boron and water supply system, the floating roof design of the make-up water tank has a plurality of problems, such as easy rollover, rubber aging, poor sealing effect, easy reoxygenation, high overhauling difficulty, long period and the like. The method is characterized in that after reoxygenation of the desalted and deoxidized water in the make-up water tank, a direct discharge mode is generally adopted, and the desalted and deoxidized water has high cost, so that more waste is caused; the thermal deaerator is positioned in a conventional island steam turbine plant, the auxiliary water supply pool, the reactor boron and water make-up water tank are positioned in the nuclear island, and pipelines move far away.
Disclosure of Invention
The invention aims to solve the problems of complex process, poor sealing effect, easy reoxygenation, high overhauling difficulty and long deoxygenation period in the traditional deoxygenation process of a nuclear power plant, and provides a deoxygenation device, a deoxygenation system using the deoxygenation device and a water treatment method of the deoxygenation system.
The technical scheme of the invention is as follows: the utility model provides a deaerating plant, 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, second deoxidization module contains at least a set of deoxidization membrane, through the pipe connection that is equipped with isolation valve between first deoxidization module and the second deoxidization module.
Further, as above the deaerating plant, wherein both the first deaerating module and the second deaerating module are disposed in 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 films.
The utility model provides an adopt above-mentioned deoxidization device's deoxidization system, includes boron water deoxidization unit and supplementary feedwater deoxidization unit, wherein, boron water deoxidization unit contains first deoxidization module, supplementary feedwater deoxidization unit contains second deoxidization module, through two at least pipe connection between boron water deoxidization unit and the supplementary feedwater deoxidization unit.
Further, the deoxygenation system as described above wherein the boron water deoxygenation unit comprises a nuclear island demineralized water distribution system connected through the first pipeline to the inlet of the first deoxygenation module, a first pipeline provided with an isolation valve, and a second pipeline through which the outlet of the first deoxygenation module is connected to a user.
Further, the deoxygenation system as described above, wherein the auxiliary water supply deoxygenation unit comprises a conventional island desalted water distribution system, an auxiliary water supply pool, a third pipeline and a fourth pipeline, wherein the third pipeline and the fourth pipeline are provided with isolation valves, the conventional island desalted water distribution system is connected with the inlet of the second deoxygenation module through the third pipeline, and the outlet of the second deoxygenation module is connected with the inlet of the auxiliary water supply pool through the fourth pipeline.
Furthermore, the first pipeline and the third pipeline are connected through a pipeline, the second pipeline and the fourth pipeline are connected through a pipeline, and an isolation valve and a one-way check valve are respectively arranged on the pipelines for connection.
Further, the oxygen removing system as described above, wherein the boron water oxygen removing unit further comprises a boron water make-up water tank disposed on the second pipeline.
Furthermore, the outlet of the boron water replenishing water tank is connected with the first pipeline, and the outlet of the auxiliary water tank is connected with the third pipeline.
When the deoxidizing system does not contain a boron water replenishing water tank, the water treatment method adopting the deoxidizing system comprises the following steps:
when the boron water replenishing system needs to provide desalted and deoxygenated water for a user, a first deoxygenation module in the deoxygenation device is used for processing the desalted water from the nuclear island;
when the water amount of the auxiliary water supply pool is insufficient, a second deoxygenation module in the deoxygenation device is used for processing the demineralized water from the conventional island;
and when the oxygen content of the water quality of the auxiliary water supply tank exceeds the standard, a second oxygen removal module in the oxygen removal device is used for treating the water in the auxiliary water supply tank.
Still further, processing the desalinated water from the nuclear island using the first oxygen removal module in the oxygen removal device further comprises: closing an isolation valve arranged on a connecting pipeline of the first pipeline and the third pipeline, closing an isolation valve arranged on a connecting pipeline of the second pipeline and the fourth pipeline, and opening the isolation valves arranged on the first pipeline and the second pipeline;
processing the desalinated water from the conventional island using a second oxygen removal module in the oxygen removal device further comprises: closing an isolation valve arranged on a connecting pipeline of the first pipeline and the third pipeline, closing an isolation valve arranged on a connecting pipeline of the second pipeline and the fourth pipeline, and opening the isolation valves arranged on the third pipeline and the fourth pipeline;
treating water of a supplemental feedwater pool using a second oxygen removal module in the oxygen removal device further comprises: closing an isolation valve arranged on a connecting pipeline of the first pipeline and the third pipeline, closing an isolation valve arranged on a connecting pipeline of the second pipeline and the fourth pipeline, and opening the isolation valve arranged on the third pipeline and the fourth pipeline.
When the deoxidizing system contains a boron water replenishing water tank, the water treatment method adopting the deoxidizing system comprises the following steps:
when the boron water supply system needs water, the oxygen content of the water quality of the boron water supply water tank exceeds the standard or the water quantity of the boron water supply water tank is insufficient, a first deoxygenation module in the deoxygenation device is used for processing the demineralized water from the nuclear island or the water from the boron water supply water tank;
and when the water quantity of the auxiliary water supply pool is insufficient or the water quality and oxygen content of the auxiliary water supply pool exceed the standard, a second oxygen removal module in the oxygen removal device is used for treating the desalted water from the conventional island or the water in the auxiliary water supply pool.
Still further, processing the desalinated water from the nuclear island or the water from the boron water make-up water tank using the first oxygen removal module in the oxygen removal device further comprises: closing an isolation valve arranged on a connecting pipeline of the first pipeline and the third pipeline, closing an isolation valve arranged on a connecting pipeline 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 conventional island desalinated water or a supplemental feedwater pool using a second oxygen removal module in the oxygen removal device further comprises: closing an isolation valve arranged on a connecting pipeline of the first pipeline and the third pipeline, closing an isolation valve arranged on a connecting pipeline of the second pipeline and the fourth pipeline, and opening the isolation valve arranged on the third pipeline and the fourth pipeline.
When the water flow needing to be supplemented to the auxiliary water supply pool exceeds 60T/h, the first oxygen removal module and the second oxygen removal module in the oxygen removal device are used for removing oxygen simultaneously.
The invention has the following beneficial effects:
according to the deoxygenation device, the deoxygenation system and the water treatment method using the deoxygenation system, on one hand, the membrane deoxygenation device is used for replacing a steam thermal deoxygenation device with a complex process, and high energy consumption lagging capacity is eliminated; the complex deoxidization operation of the thermal deaerator is reduced; the desalted water with different pH values is separately treated, and repeated flushing after cross use is not needed; the device does not need nitrogen injection protection when not used. On the other hand, if the boron water replenishing water tank is cancelled or the rubber floating roof of the boron water replenishing water tank is cancelled, the intermediate link with high failure rate can be eliminated.
In addition, in a traditional nuclear power plant, the thermal deaerator is arranged in a conventional island, two users are in the nuclear island, desalted water of the desalted water system from the nuclear island needs to be conveyed to the conventional island for treatment and then conveyed to the nuclear island, the road is far, and the failure rate is high. According to the invention, the deaerator 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 working conditions for deaerating the auxiliary water supply are less on one hand, and the fire water can be used as an emergency water source even if the auxiliary water supply is lost, so that the deaerator is arranged on the nuclear island instead of the conventional 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 reflected in no reoxygenation and demineralized water discharge and energy saving. According to the operation feedback, the operation cost of each unit in each refueling period is saved by about 12 ten thousand yuan by adopting the device and the method according to the preliminary estimation of 18 yuan/ton of the desalted and deoxidized water, 1 yuan/kWh of the electricity fee and 280 yuan/ton of the steam fee, and the total amount of 720 ten thousand yuan in the service life.
Drawings
FIG. 1 is a schematic structural 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 in accordance with an embodiment of the present invention;
fig. 3 is a schematic structural view of a second oxygen scavenging system in accordance with an embodiment of the present invention.
In the figure, 1: a deaerator;
100: a first oxygen removal module;
101: a second oxygen scavenging module;
1A, 1B, 1C and 1D are oxygen removing films;
LP, an in-situ pressure gauge;
MD is an online flowmeter;
RBM reactor boron and water supply system;
a WCD: a conventional island desalted water distribution system;
WND: a nuclear island desalted 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: adjusting a valve;
s21, S41 is a first pipeline;
s22, S42 is a second pipeline;
s31, S51 is a third pipeline;
s32, S52; a fourth pipeline;
s23, a fifth pipeline;
s33 sixth pipeline.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
Example one
The embodiment provides a deoxidizing device for keeping the dissolved oxygen content of a water tank of a nuclear power plant, and in most of the deoxidizing process, desalted water from a nuclear island passes through the deoxidizing device and then provides desalted and deoxidized water for a boron water supply system; the auxiliary water pool of the nuclear island can also be replenished by processing demineralized water from the conventional island.
The structure of a deoxygenation device 1 disclosed in this embodiment is shown in fig. 1, and the deoxygenation device 1 is shown by a dotted line frame in fig. 1 and includes a first deoxygenation module and a second deoxygenation module, where the first deoxygenation module includes three groups of deoxygenation films, which are 1A, 1B, and 1C, respectively, and the three groups of deoxygenation films are connected in series through a pipeline; the second oxygen removal module comprises a set of oxygen removal membranes 1D.
In this embodiment of the disclosure, deoxidization membrane 1A, 1B and 1C of the first deoxidization module of deoxidization device pass through the pipeline and establish ties, and the entry of deoxidization membrane 1C passes through the pipeline and inserts the demineralized water that comes from the nuclear island, and the demineralized water carries out the deoxidization in deoxidization membrane 1C, 1B and 1A in proper order afterwards to get into the user or the reactor boron water make-up water tank of reactor boron water make-up system through the outlet line who connects deoxidization membrane 1A. The entry of the deoxidization membrane 1D in the second deoxidization module of deoxidization device passes through the pipeline and inserts the demineralized water that comes from conventional island, and the deoxidization water carries out the deoxidization in deoxidization membrane 1D to get into supplementary water supply tank through the export pipeline of connecting deoxidization membrane 1D. And the first deoxidizing module and the second deoxidizing module are both arranged in a nuclear island plant. The first oxygen removal module can treat the flow rate at 45t/h, and the oxygen content after treatment is lower than 100ppb and can reach 20 ppb. The second oxygen removing module has the processing flow rate of 15t/h, and the oxygen content after processing is lower than 100ppb and can reach 20 ppb. The first and second oxygen removal modules are separately used for treating water with different pH values, are not mixed, and can reduce maintenance and replacement.
In the embodiment of the disclosure, the nitrogen purging and vacuumizing pipelines are respectively connected with the inlets and outlets of the oxygen removal films 1A, 1B, 1C and 1D, so as to promote oxygen removal or be used for cleaning the oxygen removal films.
In the embodiment of the disclosure, the desalted water with different pH values is separately treated, and repeated flushing after cross use is not needed; when the device is not used, nitrogen injection protection is not needed. On the other hand, the boron water replenishing water tank or the rubber floating roof of the boron water replenishing water tank can be cancelled, and the intermediate link with high failure rate is eliminated. After the deaerator 1 of the present embodiment deaerates the deaerated water from the nuclear island and the deaerated water from the conventional island, the oxygen content of the water can be controlled to be less than 100 ppb. The membrane deaerator and the matched circulating pump are adopted to replace a thermal deaerator and a matched steam supply facility in the prior art, so that the construction cost can be saved by at least 160 ten thousand yuan.
Example two
The present embodiment discloses an oxygen removal system, as shown in fig. 2, comprising the oxygen removal device 1, the boron water oxygen removal unit 2 and the auxiliary water supply oxygen removal unit 3 (as shown by a dashed line box in fig. 2) in example 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 disclosure, the boron water make-up tank comprises a reactor boron and water make-up system (RBM) make-up tank. The nuclear island desalted water distribution system WND is connected to an inlet of the first deoxygenation module 100 in the deoxygenation device 1 via a first pipeline S21, and an outlet of the first deoxygenation module 100 is connected to a user via a second pipeline S22. An RBM makeup tank is provided on the second line S22.
In the disclosed embodiment, the feedwater deoxygenation unit 3 comprises a conventional island demineralized water distribution system WCD, a feedwater pool, a third pipeline S31 and a fourth pipeline S32. The conventional island demineralized water distribution system WCD is connected to the inlet of the second oxygen removal module 101 in the oxygen removal device 1 by a third line S31, and the outlet of the second oxygen removal module 101 in the oxygen removal device 1 is connected to the inlet of the sub-feedwater tank by a fourth line S32.
In the disclosed embodiment, the first line S21 is connected to the third line S31 via a pipeline, and an isolation valve 141 and a one-way check valve 142 are disposed on the pipeline; the third line S22 and the fourth line S32 are connected by a line, and an isolation valve 151 and a one-way check valve 152 are provided in the line. 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 supplemental 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 to the first line S21 through a fifth line S23, and the outlet of the auxiliary feed tank is connected to the third line S31 through a sixth line S33. Circulation pumps B and A are provided on the lines S23 and S33, respectively.
In the disclosed embodiment, the pipeline S22 includes two branch pipelines, and the two branch pipelines are respectively provided with an RBM boric acid pump and an RBM water replenishing pump.
The embodiment of the disclosure also discloses a water treatment method applying the oxygen removal system, and the following operation conditions exist:
working condition 1, the boron water make-up water tank is filled with water for the first time:
the power station starts, when replenishing the water tank for boron water for the first time, isolation valves 141 and 151, and deaerator 1 keeps apart second deoxidization module 101, opens isolation valves 221 and 222, uses nuclear island demineralized water pump to carry the deaerator 1 with nuclear island demineralized water, and through the deoxidization of first deoxidization module 100, will remove the salt deoxidized water and carry to RBM replenishing water tank. Then, the circulating pump B and a valve 161 on the pipeline thereof are opened according to the oxygen content in the water tank, and the oxygen content is controlled to be lower than the target value.
Working condition 2, boron water replenishing for the water tank for standby water replenishing:
in the operation process of the power station, when the boron water replenishing tank is insufficient in water amount due to the failure of the boron recovery system and other reasons, the boron water replenishing tank is replenished with water for standby. Isolation valves 141 and 151, the second oxygen removal module 101 is isolated by the oxygen removal device 1, isolation valves 221 and 222 are opened, the nuclear island desalted water is conveyed to the oxygen removal device 1 by using a nuclear island desalted water pump, oxygen is removed by the first oxygen removal module 100, and the desalted and deoxidized water is conveyed to the RBM make-up water tank. And then opening a circulating pump B and a valve on a pipeline thereof according to the oxygen content in the water tank, and controlling the oxygen content to be lower than a target value.
And under the working condition 3, the oxygen content of the water quality of the boron water supply tank exceeds the standard:
when the power station operates, according to user requirements such as a loop or main pump seal, the boron water replenishing pump is used for delivering water from the water tank, and the water is mixed with boric acid provided by the boric acid pump and then is provided for a target user through control of the regulating valve. If the oxygen content of the water quality exceeds the standard, the circulating pump B and a valve on a pipeline thereof are opened, and the oxygen content is controlled to be lower than a target value.
Working condition 4, supplementary water supply to the pond:
the initial water and the normal moisturizing of supplementary water supply pond come from conventional island condensate water extraction system, if the power station stops piling, uses the demineralized water that is 9 for PH from conventional island demineralized water system when supplementary water supply pond water yield is not enough, is supplementary water supply pond moisturizing through deaerating plant 1. In emergency, conventional island desalted water or fire water without deoxidization can be directly used for supplementing water to the auxiliary water supply pool.
And under the working condition 5, the oxygen content of the water in the auxiliary water supply tank exceeds the standard:
the upper part of the water body of the auxiliary water supply pool is covered with nitrogen for preventing the reoxygenation of water quality. If the oxygen content exceeds the standard, the circulating pump A and a valve on a pipeline thereof are started to control the oxygen content to be lower than a target value.
Working condition 6, emergency water supplement of the auxiliary water supply pool:
if a large flow of emergency water is needed to supplement the auxiliary water supply pool, for example, the water supplement flow exceeds 60T/h, the isolation valves 141 and 151, 131 and 132 are opened, and the first oxygen removal module 100 and the second oxygen removal module 101 are put into operation; after water replenishing is finished, all the valves are closed, and the first deoxidizing module 100 is replaced by a deoxidizing film.
The deoxygenation system and the water treatment method using the same in the embodiment of the disclosure adopt the membrane deoxygenator and the matched circulating pump to replace a thermal deoxygenator and a matched steam supply facility in the prior art, and can save the construction cost by at least 160 ten thousand yuan.
EXAMPLE III
The oxygen scavenging system in the disclosed embodiment is configured as shown in fig. 3. Comprising the oxygen removing device 1, the boron water oxygen removing unit 4 and the auxiliary feed water oxygen removing unit 5 (shown by a dashed line box in fig. 3) in example 1. The structure of the auxiliary water supply deoxygenation unit 5 is the same as that of the auxiliary water supply deoxygenation unit 3 included in the deoxygenation system in the second embodiment, and is not described again. The boron water deoxygenation unit 4 includes a nuclear island demineralized water distribution system WND, a first pipeline S41, and a second pipeline S42, but does not include a boron water makeup tank. The nuclear island desalted water distribution system WND is connected to the inlet of the first oxygen removal module 100 in the oxygen removal device 1 through a first pipeline S41, and the outlet of the first oxygen removal module 100 is connected to the user through a second pipeline S42.
The embodiment of the disclosure also discloses a water treatment method applying the oxygen removal system, and the following operation conditions exist:
working condition 1, boron water replenishment system need provide the desalination deoxidization water to the user:
Working condition 2, supplementary water supply to the pond moisturizing:
the initial water filling and normal water replenishing of the auxiliary water supply pool are from a conventional island condensed water extraction system, and if the power station is shut down, the auxiliary water supply pool uses desalted water with the pH value of 9 from a conventional island desalted water system when the water quantity is insufficient, and the auxiliary water supply pool is replenished with water through the deoxidizing unit. In emergency, conventional island desalted water or fire water which is not deoxidized can be directly used for supplementing water to the auxiliary water supply pool.
The deoxygenator device isolates the first deoxygenation module 100, isolation valves 241 and 251, opens isolation valves 531 and 532, delivers conventional island demineralized water to the deoxygenator device using the conventional island demineralized water pump, deoxygenates the water through the second deoxygenation module 101, and delivers the desalinated deoxygenated water to the auxiliary water supply tank.
Working condition 3, the oxygen content of the water quality of the auxiliary water supply tank exceeds the standard
The upper part of the water body of the auxiliary water supply pool is covered with nitrogen for preventing reoxygenation of water quality. If the oxygen content exceeds the standard, the circulating pump A and a valve on a pipeline thereof are started to control the oxygen content to be lower than a target value.
Working condition 4, auxiliary water supply pool emergency water supply
If a large flow of emergency refill water is required to the auxiliary water supply tank, for example, the refill flow exceeds 60T/h, isolation valves 241 and 251, 531 and 532 are opened while the first and second oxygen scavenging modules 100 and 101 are in operation. After water replenishing is finished, all the valves are closed, and the first deoxidizing module 100 is replaced by a deoxidizing film.
The oxygen removal system and the water treatment method using the oxygen removal system in the embodiment of the disclosure are greatly improved in economy. Hardware investment is saved by 1560 ten thousand, and operating cost is saved by 720 ten thousand. The costs saved are shown in the table below.
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 attributes 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 description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (14)
1. The utility model provides a deoxidization device, its characterized in that 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, second deoxidization module contains at least a set of deoxidization membrane, through the pipe connection who is equipped with isolation valve between first deoxidization module and the second deoxidization module.
2. The oxygen scavenging device of claim 1, wherein both the first and second oxygen scavenging modules are disposed within a nuclear island facility.
3. The oxygen scavenging device of claim 1 or 2, wherein the first oxygen scavenging module comprises at least three sets of oxygen scavenging films.
4. A deoxygenation system using the deoxygenation device of any one of claims 1-3, comprising a boron water deoxygenation unit and an auxiliary water deoxygenation unit, wherein the boron water deoxygenation unit comprises the first deoxygenation module, the auxiliary water deoxygenation unit comprises the second deoxygenation module, and the boron water deoxygenation unit and the auxiliary water deoxygenation unit are connected through at least two pipelines.
5. The deoxygenation system of claim 4 wherein the boron water deoxygenation unit comprises a nuclear island demineralized water distribution system connected to the inlet of the first deoxygenation module via the first line, a first line with an isolation valve, and a second line with an outlet of the first deoxygenation module connected to a user via the second line.
6. The deoxygenation system of claim 4, wherein said secondary feed water deoxygenation unit comprises a conventional island demineralized water distribution system connected through said third line to an inlet of a second deoxygenation module, a secondary feed water pool, a third line with isolation valves, and a fourth line, wherein an outlet of a second deoxygenation module is connected through said fourth line to an inlet of said secondary feed water pool.
7. The oxygen scavenging system of claims 4-6, wherein the first line and the third line are connected by a pipeline, the second line and the fourth line are connected by a pipeline, and an isolation valve and a one-way check valve are respectively disposed on the pipelines for connection.
8. The oxygen scavenging system of any one of claims 5-7, wherein the boron water oxygen removal unit further comprises a boron water make-up tank disposed on the second pipeline.
9. The oxygen removal system of claim 8, wherein an outlet of the boron water make-up water tank is connected to the first line and an outlet of the auxiliary feed water tank is connected to the third line.
10. A method of water treatment using the oxygen scavenging system of any one of claims 5 to 7, comprising:
when the boron water replenishing system needs to provide desalted and deoxygenated water for a user, a first deoxygenation module in the deoxygenation device is used for processing the desalted water from the nuclear island;
when the water amount of the auxiliary water supply pool is insufficient, a second deoxygenation module in the deoxygenation device is used for processing the demineralized water from the conventional island;
and when the oxygen content of the water quality of the auxiliary water supply tank exceeds the standard, a second oxygen removal module in the oxygen removal device is used for treating the water in the auxiliary water supply tank.
11. The water treatment method of claim 10 wherein processing the desalinated water from the nuclear island using the first oxygen removal module in the oxygen removal device further comprises: closing an isolation valve arranged on a connecting pipeline of the first pipeline and the third pipeline, closing an isolation valve arranged on a connecting pipeline of the second pipeline and the fourth pipeline, and opening the isolation valves arranged on the first pipeline and the second pipeline;
processing the desalinated water from the conventional island using a second oxygen removal module in the oxygen removal device further comprises: closing an isolation valve arranged on a connecting pipeline of the first pipeline and the third pipeline, closing an isolation valve arranged on a connecting pipeline of the second pipeline and the fourth pipeline, and opening the isolation valves arranged on the third pipeline and the fourth pipeline;
treating water of a supplemental feedwater pool with a second oxygen removal module in the oxygen removal device further comprises: closing an isolation valve arranged on a connecting pipeline of the first pipeline and the third pipeline, closing an isolation valve arranged on a connecting pipeline of the second pipeline and the fourth pipeline, and opening the isolation valves arranged on the third pipeline and the fourth pipeline.
12. A method of treating water using the oxygen scavenging system of claim 8 or 9, comprising:
when the boron water supply system needs water, the oxygen content of the water quality of the boron water supply water tank exceeds the standard or the water quantity of the boron water supply water tank is insufficient, a first deoxygenation module in the deoxygenation device is used for processing the demineralized water from the nuclear island or the water from the boron water supply water tank;
when the water quantity of the auxiliary water supply pool is insufficient or the water quality and oxygen content of the auxiliary water supply pool exceed the standard, a second deoxygenation module in the deoxygenation device is used for treating the demineralized water from a conventional island or the water in the auxiliary water supply pool.
13. The method of water treatment of claim 12 wherein treating the demineralized water from the nuclear island or the water from the boron water make-up tank using the first oxygen removal module in the oxygen removal device further comprises: closing an isolation valve arranged on a connecting pipeline of the first pipeline and the third pipeline, closing an isolation valve arranged on a connecting pipeline 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 conventional island desalinated water or a supplemental feedwater pool using a second oxygen removal module in the oxygen removal device further comprises: closing an isolation valve arranged on a connecting pipeline of the first pipeline and the third pipeline, closing an isolation valve arranged on a connecting pipeline of the second pipeline and the fourth pipeline, and opening the isolation valve arranged on the third pipeline and the fourth pipeline.
14. The water treatment method using the oxygen removal system according to any one of claims 5 to 9, wherein when a situation occurs in which the flow rate of water to be replenished to the subsidiary water supply tank exceeds 60T/h, oxygen removal is performed by using the first oxygen removal module and the second oxygen removal module in the oxygen removal device at the same time.
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