CN209895778U

CN209895778U - Be used for pressurized water reactor primary circuit cooling water processing system

Info

Publication number: CN209895778U
Application number: CN201920526517.2U
Authority: CN
Inventors: 彭斌; 何向阳; 崔鹏
Original assignee: Fengchao (wuxi) Filtering Technology Co Ltd
Current assignee: Fengchao (wuxi) Filtering Technology Co Ltd
Priority date: 2019-04-18
Filing date: 2019-04-18
Publication date: 2020-01-03
Anticipated expiration: 2029-04-18

Abstract

The utility model provides a primary loop cooling water treatment system for a pressurized water reactor, which comprises a heat exchanger, a cooling water pool, a first booster pump, a pretreatment system, an advanced treatment system, a post-treatment system and a make-up water tank which are connected in sequence; the advanced treatment system comprises a second booster pump, at least one group of reverse osmosis membrane group and a concentrated waste liquid treatment system. The pre-filtering device uses a glass fiber filter element, and has better corrosion resistance, insulativity, heat resistance and depth filtering effect. Meanwhile, the deep treatment system adopts a reverse osmosis technology, can perform filtration and separation treatment at room temperature, and has the advantages of low energy consumption, no use of chemical reagents, no generation of chemical waste liquid, no pollution, small occupied area of equipment and low operation cost. A safety filter is arranged behind the ion exchange column to remove broken fine particles and powder generated in the ion exchange column, so that the water after reverse osmosis treatment is prevented from being polluted again.

Description

Be used for pressurized water reactor primary circuit cooling water processing system

Technical Field

The utility model relates to a nuclear power station pressurized water reactor cooling water filters technical field, especially relates to a be used for a pressurized water reactor primary circuit cooling water processing system.

Background

At present, the nuclear power stations operated at home mainly take the shapes of pressurized water reactors and heavy water reactors, and most of the nuclear power stations under construction take the shape of pressurized water reactors. The coolant used in the pressurized water reactor is water, and during the operation of the reactor, a cooling circulation purification system is required to continuously remove fission and corrosion products in the circulating water, so that the activity of a loop system is reduced. The particle size of solid suspended matters in the coolant is basically more than 3 mu m, and when the particles are accumulated excessively, the flow passage of the reactor core is blocked or the heat exchange surface is heated unevenly, so that safety accidents are caused. In addition, various required reagents for controlling the water quality of the coolant are filtered before being prepared into solution and sent into a loop so as to avoid bringing insoluble impurities.

At present, the main methods for filtering, separating and concentrating impurity particles and radioactive nuclides in a circulating water system of a nuclear power plant are evaporation and ion exchange, wherein the evaporation energy consumption is too high, the operation cost is high, a large amount of broken fine particles or powder is easily generated by the ion exchange, and the treated water cannot reach the discharge standard.

In view of the above, there is a need for an improvement in the prior art of treating a circulating water system of a pressurized water reactor to solve the above problems.

Disclosure of Invention

An object of the utility model is to disclose a be arranged in pressurized water reactor loop water processing system, detach impurity and corrosion products among the nuclear power station internal circulating water system, reduce a loop system's activity for quality of water reaches emission standard in the system, satisfies circulating water system's recycling standard, reduces the energy consumption.

In order to achieve the above object, the utility model provides a be used for a pressurized-water reactor return water processing system, including heat exchanger, cooling water pool, first booster pump, pretreatment systems, advanced treatment system, aftertreatment system, the water supply tank that connects gradually, advanced treatment system includes second booster pump, at least a set of reverse osmosis membrane group and concentrated waste liquid treatment system.

In some embodiments, the pretreatment system comprises a pre-filtration device and an adsorption device connected in series.

In some embodiments, a solid waste tank is disposed in the concentrated waste liquid treatment system.

In some embodiments, the aftertreatment system comprises an ion exchange column and a cartridge filter connected in series.

In some embodiments, at least one fiberglass filter element is disposed within the prefilter unit, the fiberglass filter element being one or both of a wound fiberglass filter element or a pleated fiberglass filter element.

In some embodiments, the adsorption device is selected from an activated carbon filter element.

In some embodiments, at least one pleated filter element is disposed within the cartridge filter.

In some embodiments, the glass fiber filter element has a filtration precision of 1 to 25 μm.

In some embodiments, the pleated filter element has a filtration precision of 0.01-1 μm.

Compared with the prior art, the beneficial effects of the utility model are that: 1. the glass fiber filter element is used in the pretreatment system, so that the pretreatment system has better corrosion resistance, insulativity, heat resistance and deep filtration effect; 2. the deep treatment system adopts the reverse osmosis technology, carries out filtration and separation treatment at room temperature, has low energy consumption, does not use chemical reagents, does not generate chemical waste liquid, has no pollution, small occupied area of equipment and low operation cost; 3. a safety filter is arranged behind the ion exchange column, and a folding filter element is used for removing broken fine particles and powder generated in the ion exchange column so as to prevent water after reverse osmosis treatment from being polluted; 4. the reverse osmosis technology can concentrate radioactive waste liquid to 30-100 times, and the radioactive waste liquid is stored in a solid waste tank after a solidification process, so that nuclear pollution is reduced.

Drawings

FIG. 1 is a schematic diagram of a primary water treatment system of a pressurized water reactor.

Description of reference numerals: 1. a heat exchanger; 2. a cooling water pool; 3. a first booster pump; 4. a pre-treatment system; 41. a pre-filtration device; 42. an adsorption device; 5. a deep processing system; 51. a second booster pump; 52. first-stage reverse osmosis; 53. secondary reverse osmosis; 54. a concentrated waste liquid treatment system; 6. a post-processing system; 61. an ion exchange column; 62. a cartridge filter; 7. and (5) a water replenishing tank.

Detailed Description

The present invention is described in detail with reference to the embodiments shown in the drawings, but it should be understood that these embodiments are not intended to limit the present invention, and those skilled in the art should understand that the functions, methods, or structural equivalents or substitutions made by these embodiments are within the scope of the present invention.

As shown in fig. 1, the primary loop water treatment system for the pressurized water reactor in the present embodiment includes a heat exchanger 1, a cooling water pool 2, a first booster pump 3, a pretreatment system 4, an advanced treatment system 5, an after-treatment system 6, and a makeup water tank 7, which are connected in sequence, where the advanced treatment system 5 includes a second booster pump 51, at least one set of reverse osmosis membrane modules, and a concentrated waste liquid treatment system 54.

The pretreatment system 4 comprises a pretreatment device 41 and an adsorption device 42 which are sequentially connected, wherein the pretreatment device 41 adopts a core type filter, a plurality of glass fiber filter cores are arranged in the filter, the used glass fiber filter cores adopt wound type filter cores, the filtering precision of the glass fiber filter cores is 1-25 mu m, and the adsorption device 42 adopts a granular activated carbon filter core. The concentrated waste liquid treatment system 54 is provided with a solid waste tank, waste liquid concentrated by the reverse osmosis membrane module is discharged into the waste liquid storage tank, and the concentrate is solidified and stored into the solid waste tank by adopting a cement solidification process according to the concentration multiple for isolation. The post-treatment system 6 comprises an ion exchange column 61 and a security filter 62 which are sequentially connected, wherein a plurality of folding filter elements are arranged in the security filter 62, and the filtering precision of the folding filter elements is 0.01-1 mu m.

After the circulating cooling water in a loop in the pressurized water reactor is recycled, the heat is recovered through the heat exchange treatment of the heat exchanger 1, the temperature of the circulating water is reduced to the room temperature, and the circulating water enters the cooling water pool 2 to be treated. Circulating water enters the pretreatment system 4 for pretreatment through the first booster pump 3, large-particle impurities and partial suspended matters in the water are removed by the glass fiber filter element in the pretreatment device 41, and the suspended matters and organic matters are removed by the adsorption device 42. Circulating water enters the advanced treatment system 5 through the second booster pump 51, permeate liquid after being treated by the first-stage reverse osmosis 52 and the second-stage reverse osmosis 53 enters the post-treatment system 6, concentrated liquid enters the concentrated waste liquid treatment system 54, solid waste is obtained through cement solidification process treatment and is stored in the solid waste tank for isolation. An ion exchange column 61 in the post-treatment system 6 removes trace salt ions in the permeate, improves the purity of the circulating water, and finally discharges the circulating water to a water supply tank 7 for later use. The cartridge filter 62 is arranged behind the ion exchange column 61 to play a role in protection, and can remove broken fine particles or powder in the ion exchange column 61 to prevent the treated circulating water from being polluted again.

In this embodiment, the pre-filtering device 41 may also be a folded glass fiber filter, and the filtering precision is preferably 10 μm. The folding glass fiber filter element has a large filtering area, can improve the filtering efficiency and the pollutant carrying capacity, prolongs the service life of the pretreatment system 4, reduces the times of contacting the polluted filter element by workers, and reduces the nuclear radiation influence. The cartridge filter 62 selects a pleated filter element having a suitable filtration accuracy, preferably a filtration accuracy of 0.05 μm, according to the size of the particle diameter of the resin in the ion exchange column 61.

The above list of details is only for the practical implementation of the present invention, and they are not intended to limit the scope of the present invention, and all equivalent implementations or modifications that do not depart from the technical spirit of the present invention should be included in the scope of the present invention.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. The utility model provides a be used for pressurized-water reactor primary circuit cooling water processing system, its characterized in that, is including the heat exchanger, cooling water pool, first booster pump, pretreatment systems, advanced treatment system, aftertreatment system, the water supply tank that connect gradually, advanced treatment system includes second booster pump, at least a set of reverse osmosis membrane group and concentrated waste liquid treatment system.

2. The primary cooling water treatment system for the pressurized water reactor as claimed in claim 1, wherein the pretreatment system comprises a pre-filtering device and an adsorption device which are connected in sequence.

3. The primary cooling water treatment system for the pressurized water reactor as claimed in claim 1, wherein a solid waste tank is arranged in the concentrated waste liquid treatment system.

4. The primary cooling water treatment system for the pressurized water reactor as claimed in claim 1, wherein the post-treatment system comprises an ion exchange column and a cartridge filter connected in series.

5. The primary loop cooling water treatment system for the pressurized water reactor as claimed in claim 2, wherein at least one glass fiber filter element is arranged in the pre-filtering device, and the glass fiber filter element is one or two of a wire-wound glass fiber filter element or a folded glass fiber filter element.

6. The primary loop cooling water treatment system for the pressurized water reactor as claimed in claim 2, wherein the adsorption device is an activated carbon filter element.

7. The primary loop cooling water treatment system for the pressurized water reactor as claimed in claim 4, wherein at least one pleated filter element is provided in the cartridge filter.

8. The primary cooling water treatment system for the pressurized water reactor as claimed in claim 5, wherein the filtering precision of the glass fiber filter element is 1-25 μm.

9. The primary cooling water treatment system for the pressurized water reactor as claimed in claim 7, wherein the filtering precision of the folded filter element is 0.01-1 μm.