CN215667452U - Demineralized water treatment device suitable for nuclear power unit raw water - Google Patents
Demineralized water treatment device suitable for nuclear power unit raw water Download PDFInfo
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- CN215667452U CN215667452U CN202120555832.5U CN202120555832U CN215667452U CN 215667452 U CN215667452 U CN 215667452U CN 202120555832 U CN202120555832 U CN 202120555832U CN 215667452 U CN215667452 U CN 215667452U
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Abstract
The utility model provides a demineralized water treatment facilities suitable for nuclear power unit raw water, includes fresh water pretreatment systems, sea fresh water system and general demineralized water processing system, fresh water pretreatment systems and sea fresh water system are connected with the ultrafiltration product water tank respectively, the ultrafiltration product water tank with general demineralized water processing system connects. The device can simultaneously utilize reservoir water and seawater as raw water to carry out demineralized water treatment, solves the problem of single source of the raw water of the demineralized water treatment system, and improves the reliability of the demineralized water of the nuclear power unit.
Description
Technical Field
The utility model belongs to the technical field of water treatment of nuclear power plants, and particularly relates to a desalted water treatment device suitable for raw water of a nuclear power unit.
Background
The fresh water is desalted by a desalted water treatment process and then provides qualified desalted water for the nuclear power station, and the desalted raw water of the nuclear power station is generally a single water source, reservoir water or seawater. Under the condition of increasingly lacking water resources, fresh water resources are saved as much as possible, and the full utilization of renewable energy sources is a necessary trend of the current development. However, different water sources have different treatment processes, the difference of corresponding water treatment equipment is large, if various water sources need to be realized, a plurality of different water treatment methods need to be established, the cost is relatively high, the occupied area is large, and the practicability is poor.
Therefore, the development of the demineralized water treatment process needs to combine the characteristics of the nuclear power generating unit to comprehensively utilize various water sources. However, at present, a multi-water-source comprehensive treatment system suitable for a nuclear power unit does not exist.
SUMMERY OF THE UTILITY MODEL
In view of the above problems, an object of the present invention is to provide a demineralized water treatment apparatus for nuclear power unit raw water, which can simultaneously utilize reservoir water and seawater as raw water to perform demineralized water treatment, thereby solving the problem of single source of raw water in a demineralized water treatment system and improving the reliability of demineralized water in a nuclear power unit.
In order to achieve the purpose, the technical scheme of the utility model is as follows:
the utility model provides a demineralized water treatment facilities suitable for nuclear power unit raw water, includes fresh water pretreatment systems, sea fresh water system and general demineralized water processing system, fresh water pretreatment systems and sea fresh water system are connected with the ultrafiltration product water tank respectively, the ultrafiltration product water tank with general demineralized water processing system connects.
As a further preferred aspect of the present invention, the general demineralized water treatment system comprises a reverse osmosis cartridge filter, a reverse osmosis membrane, a pre-desalted water tank, a cation exchange bed, an anion exchange bed and a demineralized water tank, which are connected in sequence, wherein the reverse osmosis cartridge filter is connected with the ultrafiltration water tank.
As a further preferred aspect of the present invention, an ultrafiltration product water pump and a medicament administration tank are disposed between the reverse osmosis cartridge filter and the ultrafiltration product water tank.
As a further preferred aspect of the present invention, a reverse osmosis booster pump is provided between the reverse osmosis cartridge filter and the reverse osmosis membrane.
As a further preferred aspect of the present invention, a desalting bed feed pump is provided between the pre-desalting water tank and the cation exchange bed.
As a further preferable mode of the present invention, the fresh water pretreatment system comprises a water supply tank, an ultrafiltration self-cleaning filter, and an ultrafiltration membrane module, which are connected in sequence, wherein the ultrafiltration membrane module is connected with the ultrafiltration water production tank.
In a further preferred embodiment of the present invention, a feed water pump is provided between the feed water tank and the ultrafiltration self-cleaning filter.
As a further preferred aspect of the present invention, the ultrafiltration self-cleaning filter is a laminated self-cleaning filter.
As a further preferred aspect of the present invention, the sea fresh water system comprises a sea fresh water tank connected to the ultrafiltration water production tank.
As a further preferred aspect of the present invention, the demineralized water tank is connected to the chemical feeding tank, and a chemical feed pump is provided between the demineralized water tank and the chemical feeding tank.
The demineralized water treatment device provided by the utility model can be divided into two operation modes according to the source of the water source. One mode is a demineralized water treatment process using reservoir water as raw water, which is called scheme one; the other is a process of treating desalted water by using sea fresh water as raw water, which is called scheme two.
In the first scheme, according to the requirements of reservoir water raw water quality and a nuclear power unit on the quality of demineralized water, and in consideration of reducing the medicine consumption and the wastewater amount, a general demineralized water treatment system is combined by adopting the freshwater pretreatment of ultrafiltration + reverse osmosis + primary desalination + mixed bed, and the process flow of the first scheme is as follows: reservoir water (fresh water) -a water supply tank-a water supply pump-an ultrafiltration self-cleaning filter-an ultrafiltration membrane component-an ultrafiltration product water tank-a reverse osmosis cartridge filter-a reverse osmosis membrane-a pre-desalting water tank-a cation exchange bed-an anion and cation exchange bed-a desalted water tank.
In the second scheme, according to the quality of seawater and fresh water and the requirements of a nuclear power plant on the quality of desalted water, the feed water desalted by the first-stage reverse osmosis membrane can meet the requirements of domestic water and industrial water, but the chloride, uranium ions and salt content of the feed water as raw water for desalted water production cannot be calculated, and SDI (pollution index value) and COD (chemical oxygen demand) are lower, so that the process is suitable for reverse osmosis further desalting. Therefore, the treatment system adopting reverse osmosis, primary desalting and mixed bed in the second scheme is reliable, and can reduce the medicine consumption and the operation cost and reduce the wastewater amount. The process flow of the second scheme is as follows: sea fresh water tank, reverse osmosis cartridge filter, reverse osmosis membrane, pre-desalting water tank, cation exchange bed, anion and cation exchange bed and desalted water tank.
In the device, when reservoir water and seawater are simultaneously input, a fresh water pretreatment system, a seawater and fresh water system and a general demineralized water treatment system are simultaneously started to carry out a demineralized water treatment process; when the raw water is single reservoir water, starting the fresh water pretreatment system and the general demineralized water treatment system; when the raw water is single sea fresh water, a sea fresh water system and a general desalted water treatment system are started. The three sets of independently controlled demineralized water treatment systems ensure the economy and the practicability of the device.
In conclusion, the utility model has the following beneficial effects:
the device can simultaneously use reservoir water and seawater as raw water, overcomes the defect of single water source, and improves the reliability of the desalted water of the nuclear power unit.
The device is improved aiming at the nuclear power unit, the process is mature, the economic benefit is higher, and the system can stably run for a long time.
Drawings
Fig. 1 is a schematic structural diagram of embodiment 1 of the present invention.
Fig. 2 is a schematic structural diagram of embodiment 2 of the present invention.
FIG. 3 is a schematic diagram of the desalination process of sea fresh water according to the present invention.
FIG. 4 is a schematic diagram of a desalination process of fresh water according to the present invention.
Description of the drawings: the device comprises a water supply tank 1, an ultrafiltration self-cleaning filter 2, an ultrafiltration membrane component 3, an ultrafiltration water production tank 4, a seawater and fresh water tank 5, a reverse osmosis cartridge filter 6, a reverse osmosis membrane 7, a pre-desalting water tank 8, a cation exchange bed 9, an anion exchange bed 10, an anion and cation exchange bed 11, a desalting water tank 12, a water supply pump 21, an ultrafiltration water production pump 22, a medicament feeding tank 23, a reverse osmosis booster pump 24, a desalting bed water supply pump 25 and a medicament water supply pump 26.
Detailed Description
Example 1
As shown in fig. 1, the present embodiment provides a demineralized water treatment device suitable for raw water of a nuclear power unit, which includes a fresh water pretreatment system, a sea fresh water system, and a general demineralized water treatment system, where the fresh water pretreatment system and the sea fresh water system are respectively connected to an ultrafiltration water production tank 4, and the ultrafiltration water production tank 4 is connected to the general demineralized water treatment system.
In this embodiment, the general demineralized water treatment system comprises a reverse osmosis cartridge filter 6, a reverse osmosis membrane 7, a pre-desalted water tank 8, a cation exchange bed 9, an anion exchange bed 10, an anion and cation exchange bed 11, and a demineralized water tank 12, which are connected in sequence, wherein the reverse osmosis cartridge filter 6 is connected with the ultrafiltration product water tank 4. An ultrafiltration water producing pump 22 and a medicament feeding box 23 are arranged between the reverse osmosis cartridge filter 6 and the ultrafiltration water producing tank 4. A reverse osmosis booster pump 24 is arranged between the reverse osmosis cartridge filter 6 and the reverse osmosis membrane 7. A desalting bed feed pump 25 is arranged between the pre-desalting water tank 8 and the cation exchange bed 9.
In this embodiment, the fresh water pretreatment system comprises a water supply tank 1, an ultrafiltration self-cleaning filter 2 and an ultrafiltration membrane module 3 which are connected in sequence, wherein the ultrafiltration membrane module 3 is connected with the ultrafiltration water production tank 4. A water feeding pump 21 is arranged between the water feeding tank 1 and the ultrafiltration self-cleaning filter 2. The ultrafiltration self-cleaning filter 2 is a laminated self-cleaning filter.
In this embodiment, the seawater/fresh water system comprises a seawater/fresh water tank 5 connected to the ultrafiltration product tank 4.
In this embodiment, the main function of the water supply tank 1 is to regulate and buffer the incoming water, so as to ensure that the system has a safe and stable water source. The main function of the feed pump 21 is to provide the influent water required for ultrafiltration operation that meets flow and pressure requirements. The main function of the ultrafiltration self-cleaning filter 2 is the cartridge filter of the ultrafiltration membrane module 3. The core of the laminated self-cleaning filter is a filter plate, a plurality of plastic discs with grooves on both sides are mutually superposed, a plurality of cross points are formed between the adjacent discs, and the cross points are continuously reduced from outside to inside to form the filter core with the gradient filtering effect. The filter adopting the filtering principle has dynamically changeable disc gaps during filtering and backwashing, can improve the filtering performance and greatly reduce the water consumption for backwashing. The main function of the reverse osmosis cartridge filter 6 is to prevent fine particles brought by the ultrafiltration product water tank 4 and the like from entering the reverse osmosis booster pump 24 and reverse osmosis membrane 7 elements to damage the equipment. The function of the reverse osmosis booster pump 24 is to provide feed water at the flow and pressure required for reverse osmosis operation, to overcome in-process resistance, particularly osmotic pressure of the membrane, and to maintain the output of reverse osmosis produced water. Because the system involves two water sources and needs to influence the reverse osmosis water yield, the reverse osmosis booster pump adopts the frequency conversion automatic regulation. When the reverse osmosis booster pump is started, the frequency is slowly increased, and the flow rate is gradually increased so as to avoid the impact on the reverse osmosis membrane component. The reverse osmosis membrane 7 can comprehensively consider the system output and the effluent water quality requirements according to different desalted raw water, select and install a proper reverse osmosis membrane recovery rate, and improve the raw water utilization rate.
Based on two sources of raw water, the device has two process treatment schemes: the first scheme is shown in figure 3, and the second scheme is shown in figure 4. Meanwhile, when the device operates, alkali is added at the medicament feeding box 23 to control the pH value of water to be alkaline so as to ensure chemical balance with bicarbonate and carbonate ions as main bodies; meanwhile, scale inhibitor is added to the reagent feeding box 23 to prevent scaling on the surface of the reverse osmosis membrane 7. And when the fresh water pretreatment system is out of operation, the ultrafiltration membrane is periodically maintained.
Example 2
The present embodiment differs from embodiment 1 in that the demineralized water tank 12 is connected to the drug delivery tank 23, and a drug feed pump 26 is provided between the demineralized water tank 12 and the drug delivery tank 23.
In this embodiment, the chemical feed pump 26 can deliver the demineralized water in the demineralized water tank 12 after the desalination treatment to the chemical feeding tank 23, which not only improves the efficiency of chemical feeding, but also washes the residual chemical in the chemical feeding tank 23 to avoid the residual influence on water quality or corrosion of equipment. The chemical feed pump 26 is adjustable in one direction to control the flow rate of the demineralized water flowing into the chemical feed tank 23.
The specific embodiments described herein are merely illustrative of the spirit of the utility model. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the utility model as defined in the appended claims.
Claims (10)
1. The utility model provides a demineralized water treatment facilities suitable for nuclear power unit raw water, its characterized in that, includes fresh water pretreatment systems, sea fresh water system and general demineralized water processing system, fresh water pretreatment systems and sea fresh water system are connected with ultrafiltration product water tank (4) respectively, ultrafiltration product water tank (4) with general demineralized water treatment system connects.
2. The device for treating the desalted water suitable for the raw water of the nuclear power unit as claimed in claim 1, wherein the general desalted water treatment system comprises a reverse osmosis cartridge filter (6), a reverse osmosis membrane (7), a pre-desalted water tank (8), a cation exchange bed (9), an anion exchange bed (10), an anion and cation exchange bed (11) and a desalted water tank (12) which are connected in sequence, and the reverse osmosis cartridge filter (6) is connected with the ultrafiltration product water tank (4).
3. The device for treating demineralized water applicable to nuclear power unit raw water according to claim 2, characterized in that an ultrafiltration water production pump (22) and a chemical agent feeding tank (23) are arranged between the reverse osmosis cartridge filter (6) and the ultrafiltration water production tank (4).
4. The device for treating desalted water suitable for nuclear power unit raw water according to claim 2, wherein a reverse osmosis booster pump (24) is arranged between the reverse osmosis cartridge filter (6) and the reverse osmosis membrane (7).
5. The device for treating demineralized water applicable to raw water of nuclear power generating unit as claimed in claim 2, characterized in that a demineralized water feed pump (25) is arranged between the pre-desalted water tank (8) and the cation exchange bed (9).
6. The device for treating the demineralized water applicable to the raw water of the nuclear power unit as claimed in claim 1, wherein the freshwater pretreatment system comprises a water supply tank (1), an ultrafiltration self-cleaning filter (2) and an ultrafiltration membrane component (3) which are connected in sequence, and the ultrafiltration membrane component (3) is connected with the ultrafiltration water production tank (4).
7. The device for treating demineralized water applicable to nuclear power unit raw water according to claim 6, characterized in that a water feed pump (21) is arranged between the water feed tank (1) and the ultrafiltration self-cleaning filter (2).
8. The demineralized water treatment device for nuclear power plant raw water according to claim 7, characterized in that the ultrafiltration self-cleaning filter (2) is a laminated self-cleaning filter.
9. The desalination water treatment device for nuclear power plant raw water according to claim 1, characterized in that the seawater-fresh water system comprises a seawater-fresh water tank (5) connected to the ultrafiltration water production tank (4).
10. The device for treating demineralized water applicable to nuclear power plant raw water according to claim 3, characterized in that said demineralized water tank (12) is connected to said chemical agent feeding tank (23).
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| CN202120555832.5U CN215667452U (en) | 2021-03-18 | 2021-03-18 | Demineralized water treatment device suitable for nuclear power unit raw water |
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| CN202120555832.5U CN215667452U (en) | 2021-03-18 | 2021-03-18 | Demineralized water treatment device suitable for nuclear power unit raw water |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024008201A1 (en) * | 2023-02-20 | 2024-01-11 | 中广核工程有限公司 | Water island system of nuclear power plant |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024008201A1 (en) * | 2023-02-20 | 2024-01-11 | 中广核工程有限公司 | Water island system of nuclear power plant |
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