CN106430739A - Sea-water-desalination pre-treatment system and technology for nuclear power station - Google Patents

Sea-water-desalination pre-treatment system and technology for nuclear power station Download PDF

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Publication number
CN106430739A
CN106430739A CN201611103318.8A CN201611103318A CN106430739A CN 106430739 A CN106430739 A CN 106430739A CN 201611103318 A CN201611103318 A CN 201611103318A CN 106430739 A CN106430739 A CN 106430739A
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China
Prior art keywords
water
pond
filter
ultrafiltration
air
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CN201611103318.8A
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Chinese (zh)
Inventor
孙蕾
侯芳
兰田斌
贾莹莹
马跃华
金毅
李思远
周小琴
梁宇
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HUADIAN WATER ENGINEERING Co Ltd
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HUADIAN WATER ENGINEERING Co Ltd
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Priority to CN201611103318.8A priority Critical patent/CN106430739A/en
Publication of CN106430739A publication Critical patent/CN106430739A/en
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00Multistage treatment of water, waste water, or sewage
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/001Processes for the treatment of water whereby the filtration technique is of importance
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/24Treatment of water, waste water, or sewage by flotation
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/44Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/441Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/44Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/444Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/52Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/08Seawater, e.g. for desalination
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A20/00Water conservation; Efficient water supply; Efficient water use
    • Y02A20/124Water desalination
    • Y02A20/131Reverse-osmosis

Abstract

The invention discloses a sea-water-desalination pre-treatment system and technology, particularly discloses a sea-water-desalination pre-treatment system and technology for a nuclear power station, and belongs to the technical field of nuclear-power-station sea-water desalination. The system comprises a water distributing canal (2), a medicine adding mixing pool (3), a flocculation pool (4) and a comprehensive filtering device (8), wherein the water distributing canal (2), the medicine adding mixing pool (3), the flocculation pool (4) and the comprehensive filtering device (8) are sequentially communicated. A water feeding valve (1) is arranged on the water distributing canal (2), a stirrer (5) is arranged in the medicine adding mixing pool (3), and the comprehensive filtering device (8) is communicated with a dissolved air tank (6) through a dissolved air releaser (9), and is communicated with an ultra-filtration water generating pool (19) through ultra-filtration water generating pumps (16). According to the sea-water-desalination pre-treatment system and technology, three-stage filtration of air flotation, filter-pool primary flotation and ultra filtration is adopted, the water quality of pretreated water is guaranteed, and therefore the service life of a reverse osmosis membrane is prolonged. The sea-water-desalination pre-treatment system and technology also have the corrosion resistant performance, the running service life of the whole system is prolonged, system arrangement is simpler, the structure is more compact, and comprehensive economic benefits are increased.

Description

A kind of seawater desalinization pretreatment system for nuclear power station and technique
Technical field
The present invention relates to a kind of seawater desalinization pretreatment system and technique, particularly a kind of desalinization for nuclear power station Pretreatment system and technique, belong to nuclear power station field of sea water desalting technology.
Background technology
Reverse osmosis technology is because its technical process is simple, energy consumption is low, operational control is easy, investment operation cost is relatively low at present Feature, be most widely used in industrialization desalinization.China has put into effect and most in the nuclear power station desalinization built Using reverse osmosis technology.But desalinization membrane element capability is susceptible to decay, and in major influence factors probability of happening, film is dirty Dye accounts for 77.7%.Reverse osmosis membrane can retain and filter the Organic substance that all dissolubility salt and molecular weight are more than 100, but in sea water The impact to reverse osmosis membrane for the organic fouling of small-molecular-weight be fatal, and after in-site chemical cleaning nor preferably repair Multiple, lead to the service life of reverse osmosis membrane to reduce, need frequently to change reverse osmosis membrane, increase nuclear power station desalinization and run into This.Especially when the low turbid sea water of winter low temperature or summer alga eruption, because winter ocean temperature is relatively low, suspension content is not Height, settling property is bad;The summer water temperature conveniently microbial reproduction such as algae, content of organics instantaneously increases, to pretreatment system System is formed compared with thump.The purpose of seawater desalinization pretreatment is to remove silt particle in sea water, float, colloid, Organic substance and algae The materials such as class, it is to avoid above material enters reverse osmosis membrane system and causes dirty blocking up.Therefore, the quality of the effluent quality of pretreatment is direct The life-span of impact reverse osmosis membrane.Equipment in traditional nuclear power station seawater desalinization pretreatment system arranges more open, number of devices More, floor space ratio is larger, the silt larger to particle diameter, shellfish, big float treatment effect preferably, and to little granule Thing, colloid, algae Organic substance etc. are poor because of its settling property, and operational effect is unsatisfactory.Again because of the high salt characterstic of sea water, to metal Equipment and container have stronger corrosivity, and the water process routine equipment such as flotation tank or filter tank cannot tolerate the high salinity of sea water, send out Get rusty erosion impact equipment life.
Content of the invention
It is an object of the invention to, a kind of seawater desalinization pretreatment system for nuclear power station and technique are provided.The present invention The deficiency of conventional art being made up it is ensured that entering the water quality before reverse osmosis membrane, extending reverse osmosis membrane service life, and system In equipment be resistant to the highly-saline severe corrosive of sea water, save and take up an area, energy efficient, reduce nuclear power station desalinization and run Cost.
For solving above-mentioned technical problem, the present invention adopts the following technical scheme that:
This kind is used for the distributing channel, dosing mixing pit, wadding that the seawater desalinization pretreatment system of nuclear power station includes being sequentially communicated Solidifying pond and integrated filtering device, distributing channel is provided with water intaking valve, is provided with agitator in dosing mixing pit, and integrated filtering device passes through Dissolved air release is communicated in dissolving, integrated filtering device through ultrafiltration produce water pump be communicated in ultrafiltration produce pond, ultrafiltration produce pond with Backwash pond shares, and saves floor space.
Aforesaid integrated filtering device includes air-dissolving air-float pond, filtrate Gravity filter and the submerged ultrafiltration interconnecting Pond, is integrated in same structures, compact conformation, than the floor space saving 20% in the past.Air-dissolving air-float pond is erected Straight height is higher than filtrate Gravity filter, and filtrate Gravity filter is located at air-dissolving air-float pond bottom, the vertical height of filtrate Gravity filter Higher than immersed ultrafiltration membrane pond, immersed ultrafiltration membrane pond top is provided with membrane cisterna water producing pipe.In system operation, sea water only needs weight Power flows through filtrate Gravity filter and immersed ultrafiltration membrane pond it is not necessary to setting elevator pump, water after filter pond, self-cleaning filter etc. set Standby, configuration is simple, saves 10% Installed capital cost, more greatly reduces post facility operating cost.
The top in aforesaid air-dissolving air-float pond is additionally provided with slag skimmer, and the low turbid sea water of winter low temperature is poor because of Brownian movement, sinks Fall poor performance, only undesirable by filtrate Gravity filter filter effect, small particle impurity float can be floated by air-dissolving air-float pond Select to pool surface, remove it through slag skimmer.High segasso sea water during summer alga eruption equally because Organic substance proportion is little it is also possible to Air supporting flotation removes to pool surface.
Aforesaid filtrate Gravity filter has two, two filtrate Gravity filter connections is built jointly, complements one another, to ensure it In filter tank when shutting down backwash, water conservancy project work is normally produced in another filter tank it is ensured that air supporting, filtering and run without interruption, and ensures simultaneously Immersed ultrafiltration membrane pond has continual and steady water source, not because the frequent backwash in filter tank causes ultrafiltration to produce the frequent start-stop of water pump, both extends The service life of water pump is produced in ultrafiltration, ensures that ultrafiltration produces that water level in water pool is stable it is ensured that follow-up counter-infiltration system is not because of water source Not enough and shut down, thus ensureing that nuclear power station sea-water-desalination water producing is reliable and stable to the full extent.
The side of aforesaid filtrate Gravity filter is additionally provided with filter tank backwash drain pipe and filter tank outlet valve, filtrate from top to bottom Gravity filter connects filter tank backwashing pump, the setting of valve, pipeline and pump also by pipeline, can periodically be recoiled in filter tank Wash it is ensured that the normal operation of system and good effluent quality.
It is filled with filtrate in aforesaid filtrate Gravity filter, laying anthracite, quartz sand from top to bottom are joined according to filtrate level And cobblestone, wherein anthracite granule size be 0.8~1.6, quartz sand particle size be 0.5~1.2mm, cobblestone particle diameter be 1~ 8mm.More containing silt when high sea or at the incoming tide turbidity are higher, the larger float ratio of such particle diameter is great, and settleability is good, can Sink to filter tank bottom and removal is filtered by three-layer filter.
Further, it is also equipped with hyperfiltration reverse-rinsing pump and roots blower in system, can be periodically by immersed ultrafiltration membrane pond Carry out air-water backwashing, improve effluent quality further.Immersed ultrafiltration membrane pond lays aeration tube, immersion ultrafiltration under film row Membrane cisterna top connects hyperfiltration reverse-rinsing pump by membrane cisterna backwash water pipe respectively, and bottom connects roots blower by compressed air hose.
In order to improve the service life of this pretreatment system, aforesaid dosing mixing pit, flocculation basin, integrated filtering device and Ultrafiltration produces the main body in pond all using reinforced concrete structure, inner surface integral spray anti-corrosion material polyureas, contacts with sea water Concrete inner surface, also sprayed coating polyureas.With the metal embedded part of sea water directly contact all using super-duplex stainless steel SS2507, nonmetallic materials adopt PE PVC or polyurea materials or ABS engineering plastics or nitrile rubber material.
, all using carbon steel material, agitator adopts two phase stainless steel 2507 material for aforesaid dissolving, roots blower.Filter tank Backwashing pump, ultrafiltration produce water pump and hyperfiltration reverse-rinsing pump all using excessively stream material two phase stainless steel 2507, and filter tank backwashing pump is lifted pressure Power 0.2Mpa, water pump and hyperfiltration reverse-rinsing pump adherence pressure 0.3Mpa are produced in ultrafiltration.Water intaking valve adopts pneumatic butterfly valve, and filter tank goes out Water valve adopts electric brake plate valve, and slide valve material is dual phase steel 2507.
A kind of Pretreatment Technology of Seawater Desalination for nuclear power station, using the above-mentioned seawater desalinization pretreatment for nuclear power station System.This technique all has preferable process to imitate in low temperature and low turbidity water, algae blooms water, these three difficult sea water of high sea flood tide sea water Really, can normally be run, filter back washing, ultrafiltration membrane pool backwash, four kinds of operating modes such as ultrafiltration membrane pool Chemical cleaning.
Accidental conditions comprise the steps:
Flocculation, sea water flows into the dosing mixing pit adding flocculant, so that particle is entered after forming aggregation after mixing Flocculation basin produces flocculate by flocculation reaction;
Air supporting, is entered in air-dissolving air-float pond and is mixed with microbubble mixing water, microbubble adheres to small particle impurity float Surface, makes small particle impurity float be carried by bubble and excludes through slag skimmer to the water surface;
Filter tank initial filter, the larger float of particle diameter filters through three-level filtrate Gravity filter and removes;
Ultrafiltration, water outlet goes oil removal, colloid and microorganism by the ultrafiltration membrane filaments in immersed ultrafiltration membrane pond, by super Is produced from pond in the ultrafiltration that is pumped to that water pump is produced in filter, then flows in follow-up counter-infiltration system.
Filter back washing step:Close water intaking valve, filter tank outlet valve, ultrafiltration is produced water and entered filter after the pressurization of filter tank backwashing pump In material Gravity filter, backwash is carried out to filter tank, surface is washed less, just washing, enter wastewater disposal basin through filter tank backwash drain pipe.
Ultrafiltration membrane pool backwash step:Close water intaking valve, water pump and filter tank outlet valve are produced in ultrafiltration, open hyperfiltration reverse-rinsing pump and Roots blower, ultrafiltration is produced water and is entered ultrafiltration membrane filaments through membrane cisterna backwash water pipe, and the compressed air hose of compressed air enters membrane cisterna, carries out Backwash, air-water backwashing, backwash waste enters wastewater disposal basin.
Ultrafiltration membrane pool Chemical cleaning step:Close water intaking valve, water pump and filter tank outlet valve are produced in ultrafiltration, open ultrafiltration chemistry clear Wash pump, chemical cleaning solution enters membrane cisterna, discharge cleanout fluid after soaking 1~2h to wastewater disposal basin, open hyperfiltration reverse-rinsing pump to ultrafilter membrane Silk carries out backwash 2 times.
Compared with prior art, the present invention disclosure satisfy that the pretreatment of sea water special media, can cannot by legacy system The small particle impurity suspended substance removal removing, air-dissolving air-float pond, filtrate Gravity filter and immersed ultrafiltration membrane pond is integrated in same In one structures.This system structure is compact, than the floor space saving 20% in the past, it is not necessary to setting elevator pump etc. sets Standby, configuration is simple, saves 10% Installed capital cost, also reduces post facility operating cost.System is air supporting → filter It is ensured that pretreatment effluent quality, thus preferably protecting reverse osmosis membrane not blocked up by dirty, prolongation makes pond initial filter → ultrafiltration three-stage filtration Use the life-span.In system, the anticorrosive of setting is resistant to the highly-saline severe corrosive of sea water, improves the operation of whole system Life-span, it is ensured that system safe and stable operation, improves overall economic efficiency.
Brief description
Fig. 1 is the structural representation of the present invention;
Fig. 2 is the structure sectional view of the present invention;
Fig. 3 is the planar structure layout drawing of the present invention.
The implication of reference:1- water intaking valve, 2- distributing channel, 3- dosing mixing pit, 4- flocculation basin, 5- agitator, 6- is molten Gas tank, 7- membrane cisterna backwash water pipe, 8- integrated filtering device, 9- dissolved air release, 10- air-dissolving air-float pond, 11- filtrate gravity is filtered Pond, 12- slag skimmer, 13- filter tank backwashing pump, 14- immersed ultrafiltration membrane pond, 15- filter tank backwash drain pipe, water pump is produced in 16- ultrafiltration, 17- hyperfiltration reverse-rinsing pump, 18- roots blower, pond, 20- compressed air hose, 21- filter tank outlet valve are produced in 19- ultrafiltration, and 22- membrane cisterna produces Water pipe, 23- anthracite, 24- quartz sand, 25- cobblestone.
The present invention is further illustrated with reference to the accompanying drawings and detailed description.
Specific embodiment
Embodiments of the invention 1:As shown in Figure 1, Figure 2 and Figure 3, the distributing channel 2 that this system includes being sequentially communicated, dosing mix Close pond 3, flocculation basin 4 and integrated filtering device 8, distributing channel 2 is provided with water intaking valve 1, is provided with agitator 5 in dosing mixing pit 3, comprehensive Close defecator 8 and dissolving 6 is communicated in by dissolved air release 9, integrated filtering device 8 produces water pump 16 through ultrafiltration and is communicated in ultrafiltration Produce pond 19, ultrafiltration is produced pond 19 and shared with backwash pond, saves floor space.Integrated filtering device 8 includes interconnecting Air-dissolving air-float pond 10, filtrate Gravity filter 11 and immersed ultrafiltration membrane pond 14, be integrated in same structures, structure is tight Gather, than the floor space saving 20% in the past.Air-dissolving air-float pond 10 vertical height is higher than filtrate Gravity filter 11, filtrate weight Power filter tank 11 is located at air-dissolving air-float pond 10 bottom, and the vertical height of filtrate Gravity filter 11 is higher than immersed ultrafiltration membrane pond 14, leaching Formula ultrafiltration membrane pool 14 top is not had to be provided with membrane cisterna water producing pipe 22.In system operation, sea water only needs gravity to flow through the filter of filtrate gravity Pond 11 and immersed ultrafiltration membrane pond 14, it is not necessary to the equipment such as setting elevator pump, water after filter pond, self-cleaning filter, configure simple, Save 10% Installed capital cost, more greatly reduce post facility operating cost.The top in air-dissolving air-float pond 10 also sets There is slag skimmer 12, by small particle impurity float flotation to pool surface, slag skimmer 12 removes it, and can go in air-dissolving air-float pond 10 Except the less colloid of proportion, Organic substance and algae etc. in sea water, to low temperature and low turbidity water, algae blooms water, high sea flood tide sea water this three Planting difficult sea water all has preferable treatment effect.
Filtrate Gravity filter 11 has two, two filtrate Gravity filter 11 connections is built jointly, complements one another, to ensure wherein When backwash is shut down in one filter tank, water conservancy project work is normally produced in another filter tank it is ensured that air supporting, filtration run without interruption, and ensures leaching simultaneously Do not have formula ultrafiltration membrane pool 14 to have continual and steady water source, not because the frequent backwash in filter tank causes ultrafiltration to produce the frequent start-stop of water pump 16, both prolonged Grown the service life that water pump 16 is produced in ultrafiltration, ensure that ultrafiltration produce pond 19 stable level it is ensured that follow-up counter-infiltration system not Shut down because of insufficient water sources, thus ensureing that nuclear power station sea-water-desalination water producing is reliable and stable to the full extent.Filtrate Gravity filter 11 Side be additionally provided with filter tank backwash drain pipe 15 and filter tank outlet valve 21 from top to bottom, filtrate Gravity filter 11 is also by pipeline even Connect filter tank backwashing pump 13, the setting of valve, pipeline and pump, periodically filter tank can be carried out backwash it is ensured that the normal fortune of system Row and good effluent quality.It is filled with filtrate in filtrate Gravity filter 11, laying anthracite from top to bottom is joined according to filtrate level 23rd, quartz sand 24 and cobblestone 25, wherein anthracite 23 particle diameter are 0.8~1.6, and quartz sand 24 particle diameter is 0.5~1.2mm, Cobblestone 25 particle diameter is 1~8mm, and the larger float of particle diameter is removed through elimination.
It is also equipped with hyperfiltration reverse-rinsing pump 17 and roots blower 18 in system, can periodically immersed ultrafiltration membrane pond 14 be carried out Air-water backwashing, improves effluent quality further.Immersed ultrafiltration membrane pond 14 lays aeration tube, submerged ultrafiltration under film row Pond 14 top connects hyperfiltration reverse-rinsing pump 17 by membrane cisterna backwash water pipe 7 respectively, and bottom connects Roots's wind by compressed air hose 20 Machine 18.In order to improve the service life of this pretreatment system, dosing mixing pit 3, flocculation basin 4, integrated filtering device 8 and ultrafiltration are produced The main body in pond 19 is all using reinforced concrete structure, inner surface integral spray anti-corrosion material polyureas, the concrete contacting with sea water Inner surface, also sprayed coating polyureas.With the metal embedded part of sea water directly contact all using super-duplex stainless steel SS2507, non- Metal material adopt PE PVC or polyurea materials or ABS engineering plastics or nitrile rubber material.Dissolving 6, roots blower 18 are equal Using carbon steel material, agitator 5 adopts two phase stainless steel 2507 material, and filter tank backwashing pump 13, ultrafiltration produce water pump 16 and ultrafiltration is anti- Wash pump 17 all using excessively stream material two phase stainless steel 2507, water intaking valve 1 adopts pneumatic butterfly valve, and filter tank outlet valve 21 is using electricity Dynamic slide valve, slide valve material is dual phase steel 2507, being capable of seawater corrosion resistance.
Embodiments of the invention 2:The accidental conditions of this technique as shown in Figure 1, Figure 2 and Figure 3, sea water is by water intaking valve 1 Flow through distributing channel 2 and flow into the dosing mixing pit 3 adding flocculant, enter flocculation basin 4 through dosing mixing pit 3 bottom and formed after alumen ustum Enter the molten gas release area in air-dissolving air-float pond 10, mix through the microbubble mixing water that dissolved air release 9 discharges with dissolving 6, will The microbubble producing adheres to small particle impurity float surface, makes small particle impurity float mixture proportion be slightly less than water Proportion is simultaneously carried to the water surface by bubble, is excluded float by slag skimmer 12.Air-dissolving air-float pond 10 bottom is two filtrate gravity Filter tank 11, does not lay anthracite 23, quartz sand 24 and cobblestone 25 according to filtrate level partition, wherein anthracite 23 particle diameter is 0.8 ~1.6, quartz sand 24 particle diameter is 0.5~1.2mm, and cobblestone 25 particle diameter is 1~8mm, and the larger float of particle diameter is through filtrate Gravity filter 11 filters and removes.It is low that sea water after filtering through air-dissolving air-float pond 10 flotation and filtrate Gravity filter 11 leans on gravity to flow into The immersed ultrafiltration membrane pond 14 of position setting, sets ultrafiltration membrane filaments in this membrane cisterna, produces water by the ultrafiltration that is pumped to that water pump 16 is produced in ultrafiltration Pond 19, then flows in follow-up counter-infiltration system.
Embodiments of the invention 3:As shown in Figure 1, Figure 2 and Figure 3, one of system filtrate Gravity filter 11 is shut down instead Wash, another filter tank is normally produced water conservancy project and made, and backwash operating mode is as described below, closes water intaking valve 1, filter tank outlet valve 21, and water is produced in ultrafiltration Enter in filter tank after filter tank backwashing pump 13 pressurization, backwash is carried out to filter tank, surface is washed less, just washing.Just washing also referred to as suitable washing, that is, Direction according to raw water flowing is passed through rinse water and is washed.Backwash is also referred to as back washing, is passed through according to the direction contrary with stock solution Rinse water is carried out.The whole backwash time lasts 5~10min, enters wastewater disposal basin through filter tank backwash drain pipe 15, is just washing link After the completion of, open water intaking valve 1 and filter tank outlet valve 21, recover the normal operation of filtrate Gravity filter 11.
Embodiments of the invention 4:As shown in Figure 1, Figure 2 and Figure 3 in this system immersed ultrafiltration membrane pond 14 backwash operating mode, Close water intaking valve 1, water pump 16 and filter tank outlet valve 21 are produced in ultrafiltration, open hyperfiltration reverse-rinsing pump 17 and roots blower 18, water is produced in ultrafiltration Enter ultrafiltration membrane filaments through membrane cisterna backwash water pipe 7, lay aeration tube, the compressed air of compressed air under membrane cisterna bottom film row simultaneously Pipe 20 enters membrane cisterna, carries out backwash, air-water backwashing, the whole backwash time lasts 10~15min, and backwash waste enters waste water Pond.After the completion of backwash, open water intaking valve 1, water pump 16 and filter tank outlet valve 21 are produced in ultrafiltration, close hyperfiltration reverse-rinsing pump 17 and Roots's wind Machine 18, recovers the normal operation of immersed ultrafiltration membrane pond 14.
Embodiments of the invention 5:As shown in Figure 1, Figure 2 and Figure 3 in this system immersed ultrafiltration membrane pond 14 Chemical cleaning Operating mode, closes water intaking valve 1, water pump 16 and filter tank outlet valve 21 are produced in ultrafiltration, open ultrafiltration chemical cleaning pump, chemical cleaning solution enters Membrane cisterna, discharges cleanout fluid to wastewater disposal basin, opens hyperfiltration reverse-rinsing pump 17 and carry out backwash 2 times to ultrafiltration membrane filaments, beat after soaking 1~2h Drive water valve 1 into, water pump 16 and filter tank outlet valve 21 are produced in ultrafiltration, recover the normal operation of immersed ultrafiltration membrane pond 14, entirely chemistry Scavenging period lasts 4h.Soak time is long, because Chemical cleaning needs to add chemicalses, when will have certain reaction Between, and then clean calcification impurity.
The operation principle of the present invention:Sea water flows through distributing channel 2 by water intaking valve 1 and flows into the dosing mixing pit 3 adding flocculant, Enter flocculation basin 4 through dosing mixing pit 3 bottom and form entrance air-dissolving air-float pond 10 after alumen ustum, the microbubble with dissolving 6 release Mixing water mixes, and generation float is carried and is removed by slag skimmer 12 to water face.Air-dissolving air-float pond 10 bottom is two filtrates Gravity filter 11, does not lay anthracite 23, quartz sand 24 and cobblestone 25 according to filtrate level partition, the larger float warp of particle diameter Filtrate Gravity filter 11 filters and removes.Sea water after filtering through air-dissolving air-float pond 10 flotation and filtrate Gravity filter 11 leans on gravity stream Enter the immersed ultrafiltration membrane pond 14 of low level setting, produce water pump 16 by ultrafiltration and be pumped to ultrafiltration product pond 19, then flow into follow-up Counter-infiltration system.

Claims (10)

1. a kind of seawater desalinization pretreatment system for nuclear power station it is characterised in that include be sequentially communicated distributing channel (2), Dosing mixing pit (3), flocculation basin (4) and integrated filtering device (8), distributing channel (2) is provided with water intaking valve (1), dosing mixing pit (3) it is provided with agitator (5) in, integrated filtering device (8) is communicated in dissolving (6) by dissolved air release (9), synthetic filter fills Put (8) and be communicated in ultrafiltration product pond (19) through ultrafiltration product water pump (16).
2. the seawater desalinization pretreatment system for nuclear power station according to claim 1 is it is characterised in that synthetic filter fills Put air-dissolving air-float pond (10), filtrate Gravity filter (11) and the immersed ultrafiltration membrane pond (14) that (8) inclusion interconnects;Molten gas gas Floating pond (10) vertical height is higher than filtrate Gravity filter (11), and filtrate Gravity filter (11) is located at air-dissolving air-float pond (10) bottom, The vertical height of filtrate Gravity filter (11) is higher than immersed ultrafiltration membrane pond (14);Immersed ultrafiltration membrane pond (14) top is provided with film Pond water producing pipe (22).
3. the seawater desalinization pretreatment system for nuclear power station according to claim 2 is it is characterised in that air-dissolving air-float pond (10) top is additionally provided with slag skimmer (12).
4. the seawater desalinization pretreatment system for nuclear power station according to claim 3 is it is characterised in that filter in this system Material Gravity filter (11) has two, and two filtrate Gravity filters (11) interconnect.
5. the seawater desalinization pretreatment system for nuclear power station according to claim 4 is it is characterised in that filtrate gravity is filtered The side in pond (11) is additionally provided with filter tank backwash drain pipe (15) and filter tank outlet valve (21), filtrate Gravity filter (11) from top to bottom Connect filter tank backwashing pump (13) also by pipeline.
6. the seawater desalinization pretreatment system for nuclear power station according to claim 5 is it is characterised in that filtrate gravity is filtered Pond is filled with filtrate in (11), is equipped with anthracite (23), quartz sand (24) and cobblestone (25), wherein anthracite from top to bottom (23) particle diameter is 0.8~1.6, and quartz sand (24) particle diameter is 0.5~1.2mm, and cobblestone (25) particle diameter is 1~8mm.
7. the seawater desalinization pretreatment system for nuclear power station according to claim 6 is it is characterised in that also include ultrafiltration Backwashing pump (17) and roots blower (18), immersed ultrafiltration membrane pond is provided with ultrafiltration membrane filaments in (14), and lays aeration under film row Pipe, immersed ultrafiltration membrane pond (14) top connects hyperfiltration reverse-rinsing pump (17) by membrane cisterna backwash water pipe (7) respectively, and pressure is passed through in bottom Contracting air hose (20) connects roots blower (18).
8. the seawater desalinization pretreatment system for nuclear power station according to claim 7 is it is characterised in that dosing mixing pit (3), flocculation basin (4), integrated filtering device (8) and ultrafiltration produce the main body in pond (19) all using reinforced concrete structure, interior table Polyureas is all integrally sprayed in face.
9. the seawater desalinization pretreatment system for nuclear power station according to claim 8 it is characterised in that dissolving (6), All using carbon steel material, agitator (5) adopts two phase stainless steel 2507 material to roots blower (18);Filter tank backwashing pump (13), super Filter produces water pump (16) and hyperfiltration reverse-rinsing pump (17) all using excessively stream material two phase stainless steel 2507, and filter tank backwashing pump (13) is lifted Pressure 0.2Mpa, water pump (16) and hyperfiltration reverse-rinsing pump (17) adherence pressure 0.3Mpa are produced in ultrafiltration;Water intaking valve (1) adopts Pneumatic lining Glue butterfly valve, filter tank outlet valve (21) adopts electric brake plate valve, and slide valve material is dual phase steel 2507.
10. a kind of Pretreatment Technology of Seawater Desalination for nuclear power station, using the sea water for nuclear power station described in claim 9 Desalination pretreatment system is it is characterised in that comprise the steps:
Flocculation, sea water flows into the dosing mixing pit (3) adding flocculant, makes particle enter wadding after forming aggregation after mixing Solidifying pond (4) produces flocculate by flocculation reaction;
Air supporting, is entered in air-dissolving air-float pond (10) and is mixed with microbubble mixing water, microbubble adheres to small particle impurity float Surface, makes small particle impurity float be carried by bubble and excludes through slag skimmer (12) to the water surface;
Filter tank initial filter, the larger float of particle diameter filters through three-level filtrate Gravity filter (11) and removes;
Ultrafiltration, water outlet goes oil removal, colloid and microorganism by the ultrafiltration membrane filaments in immersed ultrafiltration membrane pond (14), by super Is produced from pond (19) in the ultrafiltration that is pumped to that water pump (16) is produced in filter, then flows in follow-up counter-infiltration system;
Filter back washing, closes water intaking valve (1), filter tank outlet valve (21), and it is laggard through filter tank backwashing pump (13) pressurization that water is produced in ultrafiltration Enter in filtrate Gravity filter (11), filter tank is carried out with backwash, surface washing, is just washing, enter through filter tank backwash drain pipe (15) Wastewater disposal basin;
Ultrafiltration membrane pool backwash, closes water intaking valve (1), water pump (16) and filter tank outlet valve (21) are produced in ultrafiltration, open hyperfiltration reverse-rinsing Pump (17) and roots blower (18), ultrafiltration is produced water and is entered ultrafiltration membrane filaments, the compressed air of compressed air through membrane cisterna backwash water pipe (7) Pipe (20) enters membrane cisterna, carries out backwash, air-water backwashing, backwash waste enters wastewater disposal basin;
Ultrafiltration membrane pool Chemical cleaning, closes water intaking valve (1), water pump (16) and filter tank outlet valve (21) are produced in ultrafiltration, open ultrafiltration Learn cleaning pump, chemical cleaning solution enters membrane cisterna, discharge cleanout fluid after soaking 1~2h to wastewater disposal basin, open hyperfiltration reverse-rinsing pump (17) Ultrafiltration membrane filaments are carried out with backwash 2 times.
CN201611103318.8A 2016-12-05 2016-12-05 Sea-water-desalination pre-treatment system and technology for nuclear power station Pending CN106430739A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108535170A (en) * 2018-03-07 2018-09-14 中国核电工程有限公司 A kind of determination desalinizes seawater to the corrosive method of nuclear power plant's storage facilities

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108535170A (en) * 2018-03-07 2018-09-14 中国核电工程有限公司 A kind of determination desalinizes seawater to the corrosive method of nuclear power plant's storage facilities

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