CN216472550U - Device for removing silicon element in reactor coolant - Google Patents
Device for removing silicon element in reactor coolant Download PDFInfo
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- CN216472550U CN216472550U CN202121721647.5U CN202121721647U CN216472550U CN 216472550 U CN216472550 U CN 216472550U CN 202121721647 U CN202121721647 U CN 202121721647U CN 216472550 U CN216472550 U CN 216472550U
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Abstract
The utility model relates to the technical field of borosilicate separation, in particular to a device for removing silicon element in reactor coolant, which comprises a raw water tank provided with a water inlet pipe, a water production tank, an ion exchange column, a plurality of control valves, and is characterized by also comprising an alkali liquor adding tank and a membrane filter; an alkali liquor inlet of the raw water tank is connected with an alkali liquor adding tank through an alkali liquor conveying pump, and an outlet of the raw water tank is connected with a water inlet of the membrane filter through a raw water conveying pump; the water production outlet of the membrane filter is sequentially connected with a water production tank, a water production delivery pump and an ion exchange column; and a concentrated water outlet of the membrane filter is connected with a water return port of the raw water tank. Compared with the prior art, the utility model can purify impurities such as silicon element, corrosion products and the like in the coolant in a targeted manner, and simultaneously does not influence the water chemistry background parameters such as boric acid, lithium and the like in the original coolant; the device can realize the purification and maintenance of the daily coolant and the selective purification when the silicon content exceeds the standard, thereby improving the utilization efficiency of the device.
Description
Technical Field
The utility model relates to the technical field of borosilicate separation, in particular to a device for removing silicon element in reactor coolant.
Background
In the water for the reactor coolant of a pressurized water reactor nuclear power station, silicic acid compounds are one of the impurities of great concern in water chemistry, and SiO is generated when the content of the silicic acid compounds in the coolant is high2The precipitate is easy to be deposited on the fuel cladding, so that the corrosion to the zirconium alloy material is increased, and the safe operation of the nuclear power station is seriously influenced. The same problem also exists in spent fuel pools, leading to the formation of localized radioactive hot spots.
Studies have shown that the increase in the silicon content of the coolant is closely related to the use of the purification system for purifying water and for trapping radioactive corrosion products in the water filter cartridge.
The radioactive water filter element is mainly used for removing corrosion products and suspended solid particles existing in water in the form of glue, and is important equipment for ensuring stable operation of a nuclear power plant. At present, domestic nuclear power plants are generally selecting water filter cartridges for both foreign companies, Pall and canada 3L. But the glass fiber in the filter leaches SiO under the action of the coolant2And along with the improvement of filter element precision, the leaching amount is also continuously increased, the primary circuit coolant usually adopts a circulation purification mode, and the exchange removal rate of silicon is lower due to the operating temperature and the characteristics of resin of a resin bed for purification, so that the silicon in the circuit can be along with the filterRelease and other factors are increasing in concentration.
The common practice of pressurized water reactor nuclear power plants for reactor coolants that exceed the silicon content is to replace a portion of the coolant during shutdown and overhaul, which results in the production of large amounts of waste liquid, or to use large amounts of new resins to adsorb silicon, which results in the production of large amounts of secondary waste, which has a detrimental effect on waste minimization and is costly. Meanwhile, the primary loop coolant with the silicon element exceeding the standard cannot be processed in the power plant power operation process, and certain risk is brought to the safe operation of the nuclear power plant.
The method is mainly used for efficiently removing the overproof silicon element in the coolant on line and purifying the impurities such as corrosion products and the like in the coolant without influencing other water chemical indexes including boron concentration, lithium concentration and the like in the coolant, so that the treated coolant is reused, and the aims of good process purification effect, high purification efficiency, low secondary solid waste generation amount, simplicity in operation and the like are fulfilled.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects of the prior art, and designs a device which is convenient for selectively removing silicon elements based on the device in the follow-up process, so that the exchange capacity and the separation efficiency are improved, and the recovery rate is improved.
In order to achieve the purpose, the device for removing the silicon element in the reactor coolant comprises a raw water tank provided with a water inlet pipe, a water production tank, an ion exchange column, a plurality of control valves, and is characterized by also comprising an alkali liquor adding tank and a membrane filter;
an alkali liquor inlet of the raw water tank is connected with an alkali liquor adding tank through an alkali liquor conveying pump, and an outlet of the raw water tank is connected with a water inlet of the membrane filter through the raw water conveying pump; the water production outlet of the membrane filter is sequentially connected with a water production tank, a water production delivery pump and an ion exchange column; and a concentrated water outlet of the membrane filter is connected with a water return port of the raw water tank.
Furthermore, the exchange resin in the ion exchange column adopts hydrogen type high crosslinking degree macroporous cation exchange resin or gel type cation exchange resin.
Furthermore, the height of the exchange resin layer is 500-1500 mm.
Furthermore, a sewage discharge pipe is arranged on a pipeline between the raw water delivery pump and the membrane filter.
Compared with the prior art, the utility model has the following advantages:
1. the utility model can purify the impurities such as silicon element, corrosion products and the like in the coolant in a targeted manner, and simultaneously does not influence the water chemistry background parameters such as boric acid, lithium and the like in the original coolant; the defects that the traditional coolant purification process cannot selectively remove silicon elements, has weak exchange capacity and generates a large amount of solid waste, or the traditional mode can only dilute and discharge the silicon elements by integrally replacing the coolant, so that the economic cost is high and the generation amount of waste liquid is increased are overcome;
2. the method solves the technical problems that the traditional membrane treatment process only can carry out physical concentration, and the concentrated solution needs to be treated by adopting complicated processes such as evaporation and the like, or the problems that the process is complicated, the generation amount of solid waste is large, the water chemical property in the coolant is changed and the like caused by the fact that silicon and boron/lithium cannot be efficiently separated are solved;
3. the technical difficulty that the recycling total amount of the primary loop coolant is influenced due to low system recovery rate caused by the technical difficulty that the silicon concentration ratio of the traditional membrane treatment process is low is solved;
4. the device can realize the purification and maintenance of the daily coolant and the selective purification when the silicon content exceeds the standard, thereby improving the utilization efficiency of the device.
Drawings
FIG. 1 is a schematic diagram of the present invention.
Detailed Description
The utility model will now be further described with reference to the accompanying drawings.
Example 1
Referring to fig. 1, a device for removing silicon element in reactor coolant comprises a raw water tank 1 provided with a water inlet pipe, a water production tank 4, an ion exchange column 5, a plurality of control valves, and is characterized by further comprising an alkali liquor adding tank 2 and a membrane filter 3;
an alkali liquor inlet of the raw water tank 1 is connected with the alkali liquor adding tank 2 through an alkali liquor conveying pump 21, and an outlet of the raw water tank 1 is connected with a water inlet of the membrane filter 3 through a raw water conveying pump 11; the water production outlet of the membrane filter 3 is sequentially connected with a water production tank 4, a water production delivery pump 41 and an ion exchange column 5; and a concentrated water outlet of the membrane filter 3 is connected with a water return port of the raw water tank 1.
Furthermore, the exchange resin in the ion exchange column 5 adopts hydrogen type high crosslinking degree macroporous cation exchange resin or gel type cation exchange resin.
Furthermore, the height of the exchange resin layer is 500-1500 mm.
Further, a sewage discharge pipe 12 is arranged on a pipeline between the raw water delivery pump 11 and the membrane filter 3 and used for discharging sewage regularly.
When the coolant or the boron-containing wastewater in the primary loop of the reactor is purified, the coolant or the boron-containing wastewater is conveyed into the raw water tank 1 to be used as the raw wastewater, excessive alkaline solution is added into the raw water tank 1 to adjust the pH value of the raw wastewater to 7, and borate and silicate with higher solubility are formed, so that boric acid crystallization and SiO caused in the concentration process of the membrane filter 3 in the later period are avoided2Scaling; then the membrane filter 3 is driven by the raw water pump 11 to flow 1-100 m from the raw water tank 13The pH value of the raw wastewater is adjusted at the flow speed of/h, borate and silicate in the raw wastewater are separated, silicon element with extremely low concentration and high-valence ionic impurities in the raw wastewater are separated by a membrane filter 3, then the raw wastewater is concentrated and returns to a raw water tank 1, and when the total recovery rate of the device reaches more than 99 percent, the operation is stopped; and the permeated wastewater containing borate enters a water production tank 4, enters an ion exchange column 5 at the flow speed of 10-100 BV/h to remove redundant sodium/potassium ions and various corrosion products, and reduces the borate into boric acid.
In this example, the single pass removal rate of the membrane filter 3 for silicate was greater than 95%, and the single pass transmission rate of borate was greater than 90%.
The processing method realized by the processing device of the utility model has the following characteristics:
the pH value of the original wastewater is utilized to improve the solubility of the boric acid and the metasilicic acid, and the boric acid crystallization and SiO during the treatment of the membrane filter are avoided2Scaling by membrane filter pair of high separation rate after pH adjustmentThe raw wastewater is treated to efficiently separate silicon from boric acid. The silicon element with extremely low concentration and other high valence ionic impurities in the original wastewater are concentrated, the single treatment removal rate of the membrane filter to silicon is more than 95%, and the single transmittance of boron is more than 90%. The produced water passes through the ion exchange column 5, so that redundant sodium/potassium ions and various corrosion products are removed, and borate is reduced into boric acid, the reuse efficiency is improved, and the generation amount of solid waste is reduced; the device solves the problems that the conventional membrane treatment system only can simply carry out physical concentration and the membrane system recovery rate is low because the silicon concentration is required to be controlled not to be too high in order to avoid silicon deposition in concentrated water, the total recovery rate of the device can be more than 99 percent, the total concentration ratio of the concentrated solution is less than 1 percent, and the concentration ratio can be more than 100;
relative ion exchange resin for removing SiO2The process utilizes the advantage that the exchange capacity of the cation resin with high crosslinking degree to elements such as sodium, potassium and the like is far higher than that of the anion resin to silicon, greatly reduces the resin filling amount and the final resin solid waste generation amount, and utilizes the selectivity difference of the resin to sodium, potassium and lithium to control the operation end point of a resin bed in an ion exchange column 5 to be that sodium or potassium ions start to leak, ensures that the concentration of lithium in a loop is not changed as much as possible, avoids the influence on the water chemical characteristics of the loop, reduces borate into boric acid, and improves the purification and reuse efficiency;
the membrane filter 3 in the device can select the combination quantity of the membranes according to the treatment requirement, flexibly adjust the treatment flow, and is widely suitable for purifying and reusing various raw water containing silicon element when various nuclear power plants and nuclear facilities run.
Claims (4)
1. A device for removing silicon element in reactor coolant comprises a raw water tank (1) provided with a water inlet pipe, a water production tank (4), an ion exchange column (5) and a plurality of control valves, and is characterized by also comprising an alkali liquor adding tank (2) and a membrane filter (3);
an alkali liquor inlet of the raw water tank (1) is connected with the alkali liquor adding tank (2) through an alkali liquor conveying pump (21), and an outlet of the raw water tank (1) is connected with a water inlet of the membrane filter (3) through a raw water conveying pump (11); a water production outlet of the membrane filter (3) is sequentially connected with a water production tank (4), a water production delivery pump (41) and an ion exchange column (5); and a concentrated water outlet of the membrane filter (3) is connected with a water return port of the raw water tank (1).
2. The apparatus for removing silicon element from reactor coolant as claimed in claim 1, wherein the exchange resin in the ion exchange column (5) is hydrogen type high crosslinking degree macroporous cation exchange resin or gel type cation exchange resin.
3. The apparatus for removing silicon element in reactor coolant according to claim 2, wherein the height of the exchange resin layer is 500-1500 mm.
4. The apparatus for removing elemental silicon from a reactor coolant as claimed in claim 1, characterized in that a drain pipe (12) is further provided on the piping between the raw water feed pump (11) and the membrane filter (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121721647.5U CN216472550U (en) | 2021-07-27 | 2021-07-27 | Device for removing silicon element in reactor coolant |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121721647.5U CN216472550U (en) | 2021-07-27 | 2021-07-27 | Device for removing silicon element in reactor coolant |
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| CN216472550U true CN216472550U (en) | 2022-05-10 |
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| CN202121721647.5U Active CN216472550U (en) | 2021-07-27 | 2021-07-27 | Device for removing silicon element in reactor coolant |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113636674A (en) * | 2021-07-27 | 2021-11-12 | 上海核工程研究设计院有限公司 | Device for removing silicon element in reactor coolant and treatment method thereof |
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- 2021-07-27 CN CN202121721647.5U patent/CN216472550U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113636674A (en) * | 2021-07-27 | 2021-11-12 | 上海核工程研究设计院有限公司 | Device for removing silicon element in reactor coolant and treatment method thereof |
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Address after: No. 29 Hong Cao Road, Xuhui District, Shanghai Patentee after: Shanghai Nuclear Engineering Research and Design Institute Co.,Ltd. Address before: No. 29 Hong Cao Road, Xuhui District, Shanghai Patentee before: SHANGHAI NUCLEAR ENGINEERING RESEARCH & DESIGN INSTITUTE Co.,Ltd. |
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