CN108689454B - System and method for removing silicon dissolved in boron-containing water of nuclear power station - Google Patents
System and method for removing silicon dissolved in boron-containing water of nuclear power station Download PDFInfo
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- CN108689454B CN108689454B CN201711281118.6A CN201711281118A CN108689454B CN 108689454 B CN108689454 B CN 108689454B CN 201711281118 A CN201711281118 A CN 201711281118A CN 108689454 B CN108689454 B CN 108689454B
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- nanofiltration
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 156
- 229910052710 silicon Inorganic materials 0.000 title claims abstract description 58
- 239000010703 silicon Substances 0.000 title claims abstract description 58
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 title claims abstract description 57
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 title claims abstract description 46
- 229910052796 boron Inorganic materials 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000001728 nano-filtration Methods 0.000 claims abstract description 135
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 claims abstract description 51
- 239000004327 boric acid Substances 0.000 claims abstract description 51
- 238000000502 dialysis Methods 0.000 claims abstract description 40
- 238000011084 recovery Methods 0.000 claims abstract description 17
- 239000002901 radioactive waste Substances 0.000 claims abstract description 10
- 239000007788 liquid Substances 0.000 claims description 44
- 239000000243 solution Substances 0.000 claims description 36
- 238000003860 storage Methods 0.000 claims description 30
- 239000012528 membrane Substances 0.000 claims description 22
- 238000004140 cleaning Methods 0.000 claims description 7
- 238000007599 discharging Methods 0.000 claims description 6
- 238000010790 dilution Methods 0.000 claims description 5
- 239000012895 dilution Substances 0.000 claims description 5
- 239000002826 coolant Substances 0.000 claims description 3
- 239000010808 liquid waste Substances 0.000 claims description 3
- 230000002285 radioactive effect Effects 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 239000012535 impurity Substances 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000004090 dissolution Methods 0.000 description 3
- 238000007865 diluting Methods 0.000 description 2
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000385 dialysis solution Substances 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- -1 silicon ions Chemical class 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- 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
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
- B01D61/025—Reverse osmosis; Hyperfiltration
- B01D61/026—Reverse osmosis; Hyperfiltration comprising multiple reverse osmosis steps
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
- B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B35/00—Boron; Compounds thereof
- C01B35/08—Compounds containing boron and nitrogen, phosphorus, oxygen, sulfur, selenium or tellurium
- C01B35/10—Compounds containing boron and oxygen
- C01B35/1045—Oxyacids
- C01B35/1054—Orthoboric acid
- C01B35/109—Purification; Separation; Concentration
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/14—Maintenance of water treatment installations
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Nanotechnology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Inorganic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Removal Of Specific Substances (AREA)
Abstract
The invention belongs to the technical field of water chemistry control of nuclear power stations, and particularly relates to a system and a method for removing silicon dissolved in boron-containing water of a nuclear power station. The invention uses a multistage nanofiltration system to intercept silicon dissolved in boron-containing water, and improves the recovery rate of boric acid by repeated dialysis. The method ensures that the silicon is effectively removed, other impurities are not introduced, and the recovery rate of boric acid reaches more than 99.5%, so that the production amount of radioactive waste of the nuclear power station is reduced.
Description
Technical Field
The invention belongs to the technical field of water chemistry control of nuclear power stations, and particularly relates to a system and a method for removing silicon dissolved in boron-containing water of a nuclear power station.
Background
Boric acid is added into a loop of the nuclear power station to control reactivity, so that the safety and controllability of the nuclear power station are ensured, and the problem that boron-containing water is high in silicon dissolution is commonly existed in the nuclear power stations at home and abroad at present. When silicic acid and silicic acid colloid contained in the dissolved silicon coexist with calcium, magnesium, aluminum and other ions, silicate precipitate is easily formed on the surface of the fuel cladding, and the safe operation of the unit is endangered; the chemical property and physical property of the silicon solution are very similar to those of boric acid, so that the separation of the boric acid and the silicon solution is very difficult; because of the specificity of the nuclear power plant, strict requirements are imposed on water quality, impurities cannot be introduced while dissolved silicon is removed, and meanwhile, high recovery rate of boric acid is ensured, otherwise, the radioactive waste is very large.
At present, the silicon dissolution in the boron-containing water of the nuclear power stations at home and abroad is accumulated year by year, but a method for effectively removing the silicon dissolution is not available. Therefore, there is an urgent need to develop a method for removing silicon dissolved in boron-containing water of a nuclear power plant.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: the system and the method for removing the silicon dissolved in the boron-containing water of the nuclear power station are provided, so that the silicon dissolved in the boron-containing water of the nuclear power station is effectively removed, other impurities are not introduced, and the high recovery rate of boric acid is ensured.
The technical scheme of the invention is as follows:
The system for removing the silicon dissolved in the boron-containing water of the nuclear power station comprises a boric acid storage tank, a dialysis solution buffer tank, a primary water inlet buffer tank, a primary nanofiltration tank, a secondary water inlet buffer tank and a secondary nanofiltration tank of the nuclear power station: boron-containing water in a boric acid storage tank of the nuclear power station is conveyed to a primary water inlet buffer tank; the first-stage water inlet buffer tank is provided with two output ports, one output port is connected with the second-stage water inlet buffer tank, the other output port is connected with the first-stage nanofiltration, the first-stage nanofiltration is used for dialyzing liquid, boric acid passes through the nanofiltration membrane during dialysis, dissolved silicon is intercepted by the nanofiltration membrane, dialyzate after dialysis is conveyed to the dialyzate buffer tank, and concentrated solution flows back to the first-stage water inlet buffer tank; the second-stage water inflow buffer tank is provided with two output ports, one output port is connected with the radioactive waste recovery system of the nuclear power station, the other output port is connected with the second-stage nanofiltration, the second-stage nanofiltration is used for dialyzing liquid, boric acid passes through the nanofiltration membrane during dialysis, dissolved silicon is intercepted by the nanofiltration membrane, dialyzate after dialysis is conveyed to the dialyzate buffer tank, and concentrated solution flows back to the second-stage water inflow buffer tank; and an output port of the dialysate buffer tank is connected with a boric acid storage tank of the nuclear power station.
As a preferable scheme: a first-stage nanofiltration pump is arranged between the first-stage water inlet buffer tank and the first-stage nanofiltration; a secondary nanofiltration pump is arranged between the secondary water inlet buffer tank and the secondary nanofiltration; a dialysis pump is arranged between the dialysis buffer tank and the boric acid storage tank of the nuclear power station.
As a preferable scheme: the first-stage nanofiltration comprises a first-stage nanofiltration A and a first-stage nanofiltration B which are connected in series.
As a preferable scheme: the aperture of the nanofiltration membrane adopted by the primary nanofiltration and/or the secondary nanofiltration is 3-5nm.
A method for removing silicon dissolved in boron-containing water of a nuclear power station comprises the following steps:
Step 1
The volume of water V1 from the boric acid storage tank of the nuclear power station is discharged into a primary water inlet buffer tank, and then is subjected to dialysis through two series of primary nanofiltration A and primary nanofiltration B after being boosted by a primary nanofiltration pump, the dialysate flows into a dialysate buffer tank, and the concentrated solution flows back into the primary water inlet buffer tank; the water inflow of the primary water inflow buffer tank is regulated to be equal to the dialysis flow, so that the primary water inflow buffer tank is ensured to be maintained at a fixed liquid level H1; stopping water inflow when the accumulated treatment capacity reaches the volume V1, and stopping the operation of the first-stage nanofiltration system comprising the first-stage nanofiltration pump, the first-stage nanofiltration A and the first-stage nanofiltration B until the liquid level of the first-stage water inflow buffer tank is reduced to H2, wherein the operation of the first-stage nanofiltration pump is stopped, and finally the volume of the residual solution V2 of the first-stage water inflow buffer tank is increased;
Step 2
The residual V2 volume solution in the primary water inlet buffer tank is automatically added with the V3 volume of the solution in the boric acid storage tank of the nuclear power station and is discharged to the secondary water inlet buffer tank together, namely, the residual boron-containing water containing high-concentration dissolved silicon after the primary nanofiltration is added with a certain proportion of source water for dilution and then enters a secondary nanofiltration system for treatment; when the liquid level of the secondary water inlet buffer tank reaches the height H3, the secondary nanofiltration pump is started to enable the secondary nanofiltration to start dialysis, the dialysate flows into the dialysate buffer tank, and the concentrated solution flows back into the secondary water inlet buffer tank;
Step 3
When the accumulated treatment capacity of a secondary nanofiltration system comprising a secondary nanofiltration pump and secondary nanofiltration reaches (V2 + V3) volume and a secondary water inlet buffer tank is concentrated to H4 liquid level, adding a certain proportion of desalted water into the boron-containing water containing high-concentration dissolved silicon remained in the secondary water inlet buffer tank for dilution, continuing to dialyze through the secondary nanofiltration, discharging the dialysate into a dialysate buffer tank for further recovery to a boric acid storage tank of a nuclear power station, and discharging the concentrated solution back to the secondary water inlet buffer tank for continuous dialysis, namely, improving the boric acid recovery rate through repeated dialysis;
Step 4
When the secondary nanofiltration system continuously runs to the height of the liquid level H5, the secondary nanofiltration pump stops running, and the residual concentrated solution of the secondary water inflow buffer tank is used as radioactive liquid waste to be treated by the radioactive waste recovery system of the nuclear power station;
Setting a high liquid level H6 and a low liquid level H7 for the dialysate buffer tank, and continuously operating a removing system of the silicon dissolved in the boron-containing water of the nuclear power station when the liquid level height in the dialysate buffer tank is between H7 and H6; when the liquid level of the dialysate buffer tank reaches a high liquid level H6, automatically starting to deliver water to the boric acid storage tank of the nuclear power station through the dialysis pump, and when the liquid level of the dialysate buffer tank is a low liquid level H7, stopping delivering water by the dialysis pump; the system completes the treatment process of a batch of boron-containing water;
Step 5
After the system of one batch is operated, the system enters a cleaning mode, a solution in a boric acid storage tank of the nuclear power station is automatically added to clean the membrane system for 1 time, cleaning water flows back to the boric acid storage tank of the nuclear power station, and then the next batch of water treatment process is carried out, so that the removal of dissolved silicon in the coolant of the nuclear power station is completed.
As a preferable scheme:
In step 1, v1=10m 3, h1=0.9m, h2= 0.3m, v2=100deg.L;
In step 2, v3=150l, h3=0.2m;
In step 3, h4=0.4m;
in step4, h5=0.15m, h6=0.2 m, h7=0.1 m.
The beneficial effects of the invention are as follows:
According to the system and the method for removing the silicon dissolved in the boron-containing water of the nuclear power station, disclosed by the invention, the boric acid and the silicon dissolved are effectively separated by adopting the multi-stage nanofiltration system, so that the recovery rate of the boric acid reaches more than 99.5% while the silicon dissolved is effectively removed and other impurities are not introduced, and the production amount of radioactive waste of the nuclear power station is reduced.
Drawings
FIG. 1 is a schematic diagram of the system for removing silicon dissolved in boron-containing water in a nuclear power station.
In the figure: 1-a boric acid storage tank of a nuclear power station; 2-dialysate buffer tank; 3-a first-stage water inlet buffer tank; 4-first-stage nanofiltration A; 5-first-stage nanofiltration B; 6-a secondary water inlet buffer tank; 7-second-stage nanofiltration; 8-a first-stage nanofiltration pump; 9-a secondary nanofiltration pump; 10-dialysis pump.
Detailed Description
The system and the method for removing the silicon dissolved in the boron-containing water of the nuclear power station are described in detail below with reference to the accompanying drawings and the examples.
The invention combines the operation characteristics of the nuclear power station, and designs a system for removing silicon dissolved in boron-containing water of the nuclear power station: discharging boron-containing water into a silicon removing system in batches for treatment; the silicon removing system comprises two series of first-level nanofiltration systems and one series of second-level nanofiltration systems which are connected in series and auxiliary equipment; when the boron-containing water passes through the nanofiltration system, boric acid penetrates through the nanofiltration membrane, and dissolved silicon is trapped by the nanofiltration membrane; the dialysate of the primary and secondary nanofiltration systems is recovered into a source water tank, and the concentrated solution is returned to the primary or secondary nanofiltration system to continue dialysis; adding a certain proportion of source water into the residual boron-containing water containing high-concentration silicon after the first-stage nanofiltration, diluting the residual boron-containing water containing high-concentration silicon after the first-stage nanofiltration, and adding a certain proportion of desalted water into the residual boron-containing water containing high-concentration silicon after the second-stage nanofiltration, diluting the residual boron-containing water containing high-concentration silicon after the second-stage nanofiltration, and continuously treating the residual boron-containing water through the second-stage nanofiltration, thereby improving the boric acid recovery rate through repeated dialysis; the final residual concentrated solution of the secondary nanofiltration system is used as radioactive waste to be treated by a special system of the nuclear power station; after the system is used for cleaning equipment again by using the source water, the silicon dissolving removal of the boron-containing water of the nuclear power station in one batch is completed.
Example 1
As shown in fig. 1, the system for removing silicon dissolved in boron-containing water in a nuclear power station in this embodiment includes a boric acid storage tank 1, a dialysate buffer tank 2, a primary water inlet buffer tank 3, a primary nanofiltration tank 6, a secondary water inlet buffer tank 7 in the nuclear power station.
The boron-containing water in the boric acid storage tank 1 of the nuclear power station is conveyed to a primary water inlet buffer tank 3; the first-stage water inlet buffer tank 3 is provided with two output ports, one output port is connected with the second-stage water inlet buffer tank 6, the other output port is connected with the first-stage nanofiltration, the first-stage nanofiltration is used for dialyzing liquid, boric acid passes through the nanofiltration membrane during dialysis, dissolved silicon is intercepted by the nanofiltration membrane, dialyzate after dialysis is conveyed to the dialyzate buffer tank 2, and concentrated solution flows back to the first-stage water inlet buffer tank 3; the secondary water inflow buffer tank 6 is provided with two output ports, one output port is connected with a radioactive waste recovery system of the nuclear power station, the other output port is connected with a secondary nanofiltration 7, the secondary nanofiltration 7 dialyzes liquid, boric acid passes through the nanofiltration membrane during dialysis, dissolved silicon is intercepted by the nanofiltration membrane, dialyzate after dialysis is conveyed to the dialyzate buffer tank 2, and concentrated solution flows back to the secondary water inflow buffer tank 6; and an output port of the dialysate buffer tank 2 is connected with the boric acid storage tank 1 of the nuclear power station.
In this embodiment, a first-stage nanofiltration pump 8 may be disposed between the first-stage water inlet buffer tank 3 and the first-stage nanofiltration, and is configured to boost the pressure of the liquid that is transferred from the first-stage water inlet buffer tank 3 to the first-stage nanofiltration; a secondary nanofiltration pump 9 can be arranged between the secondary water inflow buffer tank 6 and the secondary nanofiltration 7 and used for boosting the liquid conveyed to the secondary nanofiltration 7 by the secondary water inflow buffer tank 6.
In this embodiment, a dialysis pump 10 is provided between the dialysate buffer tank 2 and the boric acid storage tank 1 of the nuclear power plant.
In this embodiment, the first-stage nanofiltration may include a first-stage nanofiltration A4 and a first-stage nanofiltration B5 connected in series.
In this embodiment, the aperture of the nanofiltration membrane used for the primary nanofiltration and the secondary nanofiltration 7 is 3-5nm.
Example 2
A method for removing silicon dissolved in boron-containing water of a nuclear power station based on the device of the embodiment 1, comprising the following steps:
Step 1
The boric acid storage tank 1 of the nuclear power station discharges the volume of water V1 into the primary water inlet buffer tank 3, and then is subjected to dialysis through two series of primary nanofiltration A4 and primary nanofiltration B5 after being boosted by the primary nanofiltration pump 8, the dialysate flows into the dialysate buffer tank 2, and the concentrated solution flows back into the primary water inlet buffer tank 3. The water inflow of the primary water inflow buffer tank 3 is automatically adjusted to be equal to the dialysis flow, so that the primary water inflow buffer tank 3 is ensured to be maintained at a fixed liquid level H1. When the accumulated treatment capacity reaches the volume V1, water inflow is stopped, a first-stage nanofiltration system comprising a first-stage nanofiltration pump 8, a first-stage nanofiltration A4 and a first-stage nanofiltration B5 is continuously operated until the liquid level of the first-stage water inflow buffer tank 3 is reduced to H2, the first-stage nanofiltration pump 8 is stopped, and the volume of the residual solution V2 of the first-stage water inflow buffer tank 3 is finally stopped.
In this example, v1=10m 3, h1=0.9m, h2= 0.3m, v2=100deg.L.
Step 2
The volume of the solution V3 in the boric acid storage tank 1 of the nuclear power station is automatically added into the residual volume of the solution V2 in the primary water inlet buffer tank 3 and is discharged to the secondary water inlet buffer tank 6 together, namely, the residual boron-containing water containing high-concentration dissolved silicon after the primary nanofiltration is diluted by adding a certain proportion of source water and then enters a secondary nanofiltration system for treatment; when the liquid level of the secondary water inflow buffer tank 6 reaches the height H3, the secondary nanofiltration pump 9 is automatically started to enable the secondary nanofiltration 7 to start dialysis, the dialysate flows into the dialysate buffer tank 2, and the concentrated solution flows back into the secondary water inflow buffer tank 6.
In this embodiment, v3=150l, h3=0.2m.
Step 3
When the accumulated treatment capacity of the secondary nanofiltration system including the secondary nanofiltration pump 9 and the secondary nanofiltration pump 7 reaches the volume (V2 + V3) and the secondary water inflow buffer tank 6 is concentrated to the H4 liquid level, adding a certain proportion of desalted water into the boron-containing water containing high concentration dissolved silicon remained in the secondary water inflow buffer tank 6 for dilution, for example, adding V4 volume of desalted water into the boron-containing water containing high concentration dissolved silicon remained in the secondary water inflow buffer tank 6 for dilution, continuing to dialyze through the secondary nanofiltration pump 7, discharging the dialysate into the dialysate buffer tank 2 to be recycled to the boric acid storage tank 1 of the nuclear power station, and discharging the concentrated solution back to the secondary water inflow buffer tank 6 for continuing dialysis, namely, improving the boric acid recovery rate through repeated dialysis.
In this embodiment, h4=0.4m, v4=12.7l.
Step 4
And when the secondary nanofiltration system continuously runs to the height of the liquid level H5, the secondary nanofiltration pump stops running, and the residual concentrated solution of the secondary water inflow buffer tank 6 is treated by the radioactive waste recovery system of the nuclear power station as radioactive liquid waste.
In this embodiment, h5=0.15 m.
In this embodiment, a high liquid level H6 and a low liquid level H7 are set for the dialysate buffer tank 2, and when the liquid level height in the dialysate buffer tank 2 is between H7 and H6, the removal system of silicon dissolved in boron-containing water in the nuclear power station described in embodiment 1 is continuously operated. When the liquid level of the dialysate buffer tank 2 reaches the high liquid level H6, water delivery to the boric acid storage tank 1 of the nuclear power station is automatically started through the dialysis pump 10, and when the liquid level of the dialysate buffer tank 2 is the low liquid level H7, the dialysis pump 10 stops water delivery. The system completes the treatment process of a batch of boron-containing water.
In this example, h6=0.2 m, h7=0.1 m.
Step 5
After the system of a batch is completed, the system enters a cleaning mode, a solution in the boric acid storage tank 1 of the nuclear power station is automatically added to clean the membrane system for 1 time, cleaning water flows back to the boric acid storage tank 1 of the nuclear power station, and the problems that crystallization is precipitated and polluted due to the too high concentration of dissolved silicon ions are prevented, and the flux of the membrane core is influenced and the service life of the membrane core is prolonged. And then the system is started to automatically enter the next batch of water treatment process, so that the removal of the dissolved silicon in the coolant of the nuclear power station is completed.
Claims (4)
1. The utility model provides a removal system of dissolved silicon in boron-containing water of nuclear power station, includes nuclear power station boric acid bin (1), dislysate buffer tank (2), one-level buffer tank (3) that intakes, one-level nanofiltration, second grade buffer tank (6) and second grade nanofiltration (7), its characterized in that: boron-containing water in a boric acid storage tank (1) of the nuclear power station is conveyed to a primary water inlet buffer tank (3); the first-stage water inlet buffer tank (3) is provided with two output ports, one output port is connected with the second-stage water inlet buffer tank (6), the other output port is connected with the first-stage nanofiltration, the first-stage nanofiltration is used for dialyzing liquid, boric acid passes through the nanofiltration membrane during dialysis, dissolved silicon is intercepted by the nanofiltration membrane, dialyzate after dialysis is conveyed to the dialyzate buffer tank (2), and concentrated solution flows back to the first-stage water inlet buffer tank (3); the secondary water inflow buffer tank (6) is provided with two output ports, one output port is connected with a radioactive waste recovery system of the nuclear power station, the other output port is connected with a secondary nanofiltration (7), the secondary nanofiltration (7) is used for dialyzing liquid, boric acid passes through the nanofiltration membrane during dialysis, silicon is intercepted by the nanofiltration membrane, dialyzate after dialysis is conveyed to the dialyzate buffer tank (2), and concentrated solution flows back to the secondary water inflow buffer tank (6); the output port of the dialysate buffer tank (2) is connected with the boric acid storage tank (1) of the nuclear power station; the aperture of the nanofiltration membrane adopted by the primary nanofiltration and/or the secondary nanofiltration (7) is 3-5nm;
A first-stage nanofiltration pump (8) is arranged between the first-stage water inlet buffer tank (3) and the first-stage nanofiltration; a secondary nanofiltration pump (9) is arranged between the secondary water inflow buffer tank (6) and the secondary nanofiltration pump (7); a dialysis pump (10) is arranged between the dialysis buffer tank (2) and the boric acid storage tank (1) of the nuclear power station.
2. The system for removing silicon dissolved in boron-containing water of a nuclear power plant according to claim 1, wherein: the first-stage nanofiltration comprises a first-stage nanofiltration A (4) and a first-stage nanofiltration B (5) which are connected in series.
3. A method for removing silicon dissolved in boron-containing water of a nuclear power station is characterized by comprising the following steps: the method comprises the following steps:
Step 1
The boric acid storage tank (1) of the nuclear power station discharges the volume of water V1 into a primary water inlet buffer tank (3), is boosted by a primary nanofiltration pump (8) and is dialyzed by two rows of primary nanofiltration A (4) and primary nanofiltration B (5) which are connected in series respectively, the dialysate flows into a dialysate buffer tank (2), and the concentrated solution flows back into the primary water inlet buffer tank (3); the water inflow of the primary water inflow buffer tank (3) is regulated to be equal to the dialysis flow, so that the primary water inflow buffer tank (3) is ensured to be maintained at a fixed liquid level H1; stopping water inflow when the accumulated treatment capacity reaches the volume V1, and continuously operating a primary nanofiltration system comprising a primary nanofiltration pump (8), a primary nanofiltration A (4) and a primary nanofiltration B (5) until the liquid level of the primary water inflow buffer tank (3) is reduced to H2, wherein the primary nanofiltration pump (8) stops operating, and finally the volume of the residual solution V2 of the primary water inflow buffer tank (3);
Step 2
The volume of the solution V2 remained in the primary water inlet buffer tank (3) is automatically added with the volume of the solution V3 in the boric acid storage tank (1) of the nuclear power station, and the solution V3 is discharged to the secondary water inlet buffer tank (6) together, namely, the residual boron-containing water containing high-concentration silicon solution after the primary nanofiltration is diluted by adding a certain proportion of source water and then enters a secondary nanofiltration system for treatment; when the liquid level of the secondary water inflow buffer tank (6) reaches the height H3, the secondary nanofiltration pump (9) is started to enable the secondary nanofiltration (7) to start dialysis, the dialysate flows into the dialysate buffer tank (2), and the concentrated solution flows back into the secondary water inflow buffer tank (6);
Step 3
When the accumulated treatment capacity of a secondary nanofiltration system comprising a secondary nanofiltration pump (9) and a secondary nanofiltration pump (7) reaches the volume (V2 + V3) and a secondary water inflow buffer tank (6) is concentrated to the H4 liquid level, adding a certain proportion of desalted water into the boron-containing water containing high-concentration dissolved silicon remained in the secondary water inflow buffer tank (6) for dilution, continuing to dialyze through the secondary nanofiltration pump (7), discharging dialysate into a dialysate buffer tank (2) for further recovery into a boric acid storage tank (1) of a nuclear power station, and continuously dialyzing the concentrated solution back to the secondary water inflow buffer tank (6), namely, improving the boric acid recovery rate in a repeated dialysis mode;
Step 4
When the secondary nanofiltration system continuously runs to the height of the liquid level H5, the secondary nanofiltration pump stops running, and the residual concentrated solution of the secondary water inflow buffer tank (6) is used as radioactive liquid waste to be treated by the radioactive waste recovery system of the nuclear power station;
Setting a high liquid level H6 and a low liquid level H7 for the dialysate buffer tank (2), and continuously operating a removing system of dissolved silicon in boron-containing water of the nuclear power station when the liquid level height in the dialysate buffer tank (2) is between H7 and H6; when the liquid level of the dialysate buffer tank (2) reaches a high liquid level H6, automatically starting to deliver water to the boric acid storage tank (1) of the nuclear power station through the dialysis pump (10), and when the liquid level of the dialysate buffer tank (2) is a low liquid level H7, stopping delivering water by the dialysis pump (10); the system completes the treatment process of a batch of boron-containing water;
Step 5
After the system of one batch is operated, the system enters a cleaning mode, a solution in a boric acid storage tank (1) of the nuclear power station is automatically added to clean the membrane system for 1 time, cleaning water flows back to the boric acid storage tank (1) of the nuclear power station, and then the next batch of water treatment process is carried out, so that the removal of dissolved silicon in the coolant of the nuclear power station is completed.
4. A method for removing silicon dissolved in boron-containing water of a nuclear power station as set forth in claim 3, wherein:
In step 1, v1=10m 3, h1=0.9m, h2= 0.3m, v2=100deg.L;
In step 2, v3=150l, h3=0.2m;
In step 3, h4=0.4m;
in step4, h5=0.15m, h6=0.2 m, h7=0.1 m.
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