CN115818886A - Method and device for controlling quality of cooling water in converter valve - Google Patents
Method and device for controlling quality of cooling water in converter valve Download PDFInfo
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- CN115818886A CN115818886A CN202211617965.6A CN202211617965A CN115818886A CN 115818886 A CN115818886 A CN 115818886A CN 202211617965 A CN202211617965 A CN 202211617965A CN 115818886 A CN115818886 A CN 115818886A
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
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- Treatment Of Water By Ion Exchange (AREA)
Abstract
The invention discloses a method and a device for controlling the quality of cooling water in a converter valve. The device comprises a cold water tank in the converter valve, an EDI module, a circulating water tank, a degassing device and an ion exchanger. The method and the device can remove impurities in the cold water in the converter valve, stabilize the quality of the cold water, solve the problems that the ion exchange resin cannot be replaced during the operation period, cannot be flushed at the initial stage of operation to ensure the quality of the cold water, the ion exchange resin dissolved matter influences the quality of the cold water, and the like, meet the zero emission requirement of the cold water, and effectively improve the operation reliability and the economical efficiency of a cold water system in a converter station.
Description
Technical Field
The invention belongs to the field of treatment of cooling water in a converter valve, and particularly relates to a method and a device for controlling the quality of the cooling water in the converter valve.
Background
With the continuous development of electric power systems, the construction of novel electric power systems, and the construction and operation of large-scale extra-high voltage and high-voltage transmission projects. The converter station is a part for realizing mutual energy conversion between alternating current and direct current in an extra-high voltage and high-voltage direct current transmission system, and is also a central link of direct current transmission. The converter valve is the most core and key component for realizing alternating current-direct current conversion in the converter station, bears heavy current and high voltage during normal operation, and generates a large amount of heat in the operation process to be taken away by an internal cooling water system. Deionized water is generally adopted as a cooling medium in a cooling water system of the converter valve, and the requirement on the quality of the internally cooled water is very strict so as to prevent the equipment from being failed due to corrosion and scaling of the cooling water system. According to incomplete statistics, in 2015-2021, the fault caused by the cold water system in the valve accounts for more than 45% of the fault of the converter station. Therefore, the problems of how to effectively control the quality of the internal cooling water, improve the reliability of water quality control and reduce the metal scaling of the internal cooling water system of the valve need to be solved urgently.
At present, a bypass ion exchange resin method is generally adopted for purifying the quality of internal cooling water in a cooling water system of a converter valve, and the method mainly has the following defects: (1) The ion exchange resins have a short operating life and need to be replaced periodically. However, as the cold water system in the converter valve is not provided with a demineralized water replenishing system, in order to prevent water quality deterioration or accidents in the operation process of the converter valve, the replacement and maintenance work of the corresponding ion exchange resin is not allowed, and the replacement can only be carried out in combination with annual maintenance, so that the ion exchange resin is not invalid and replaced or is not replaced in time, and high operation and maintenance cost or hidden danger exists; (2) The operation and the operation of the ion exchange resin need to be washed to remove impurities and resin powder, and the cold water system in the converter valve does not have an additional water system for washing, so that the direct operation easily causes poor initial water quality, and foreign matters precipitated from the ion exchange resin enter the cold water system in the converter valve; (3) Impurities such as organic matters and ions are separated out in the operation process of the ion exchange resin, so that the water quality is influenced to accelerate the corrosion of metal materials. Some scholars propose one or more of EDI and reverse osmosis as internal cold water treatment systems, but these treatment systems suffer from the following disadvantages: firstly, there is dense water to discharge and needs a large amount of interior cold water to supply, causes the water waste, fortune dimension cost to increase, and the converter valve does not design demineralized water charging system moreover, and it is not suitable to current valve cooling system. Therefore, a new method for controlling the quality of cooling water in a converter valve is needed to replace the prior art.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a method and a device for controlling the quality of cooling water in a converter valve, which can remove impurities in the cooling water in the converter valve, stabilize the quality of the cooling water, solve the problems that ion exchange resin cannot be replaced during the operation period, cannot be flushed at the initial operation stage to ensure the quality of water, and ion exchange resin dissolved matters influence the quality of water, meet the zero emission requirement of the cooling water, and effectively improve the operation reliability and the economical efficiency of a cooling water system in a converter station.
In order to solve the technical problems, the invention adopts the following technical scheme:
a method for controlling quality of cooling water in a converter valve comprises the steps of firstly adopting an EDI module bypass to treat cooling water in the converter valve, sending produced water of the EDI module back to a cold water tank in the converter valve, sending concentrated water and extreme water of the EDI module to a circulating water tank, degassing mixed water in the circulating water tank through a degassing device, carrying out ion exchange treatment on degassed cooling water through an ion exchanger, and sending obtained deionized cooling water to the EDI module for continuous treatment to obtain qualified EDI produced water.
In the method for controlling the quality of the cooling water in the converter valve, preferably, the water production resistivity of the EDI module is more than or equal to 18 MOmega cm.
In the method for controlling the quality of the cooling water in the converter valve, the content of each gas in the cooling water treated by the degasser is preferably less than 2ppb.
In the method for controlling the quality of the cooling water in the converter valve, preferably, the degassing device is provided with a degassing membrane, the degassing membrane is a gas-liquid separation membrane, and the degassing efficiency is more than 99.99%.
In the method for controlling the quality of the cooling water in the converter valve, preferably, the ion exchanger is a mixed bed composed of hydroxide anion exchange resin and hydrogen cation exchange resin.
As a general technical concept, the invention further provides a device for controlling the quality of cooling water in a converter valve, which comprises a cold water tank in the converter valve, an EDI module, a circulating water tank, a degasser and an ion exchanger, wherein the EDI module is provided with a first water inlet, a second water inlet, a produced water outlet, an extreme water outlet and a concentrated water outlet, a water outlet of the cold water tank in the converter valve is communicated with the first water inlet of the EDI module, the produced water outlet of the EDI module is communicated with a water return port of the cold water tank in the converter valve, the extreme water outlet and the concentrated water outlet of the EDI module are respectively communicated with the water inlet of the circulating water tank, and a water outlet of the circulating water tank, the degassing membrane, the ion exchanger and the second water inlet of the EDI module are sequentially communicated.
Preferably, a water feeding pump and a valve are arranged between the water outlet of the cold water tank in the converter valve and the first water inlet of the EDI module, between the water outlet of the circulating water tank and the degasser, and between the ion exchanger and the second water inlet of the EDI module.
In the above device for controlling the quality of the cooling water in the converter valve, preferably, the degassing device is provided with an exhaust port, and the exhaust port is communicated with a vacuum pump.
Preferably, the device for controlling the quality of the cooling water in the converter valve is provided with valves on a pipeline between a produced water outlet of the EDI module and a water return port of a cold water tank in the converter valve, a pipeline between a concentrated water outlet of the EDI module and a water inlet of the circulating water tank, a pipeline between an extreme water outlet of the EDI module and a water inlet of the circulating water tank, and a pipeline between the degasser and the ion exchanger.
Preferably, the number of the ion exchangers is two, and the two ion exchangers are arranged in parallel.
The invention discloses an EDI (Electro-deionization) technology, which is a pure water manufacturing technology combining an ion exchange technology, an ion exchange membrane technology and an ion electromigration technology, combines the electrodialysis technology and the ion exchange technology, utilizes high voltage of electrodes at two ends to move charged ions in water, and cooperates with an ion exchange resin and a selective resin membrane to accelerate the removal of the ions, thereby achieving the purpose of water purification.
Compared with the prior art, the invention has the advantages that:
the method and the device adopt an EDI module to treat cold water in the converter valve, and adopt a degassing device (degassing membrane) and an ion exchanger to jointly treat concentrated water and polar water generated in the EDI operation process. The EDI treatment ensures that the quality of the cold water in the valve is stable and reliable, the maintenance period is long, the degassing device and the ion exchanger are combined to treat EDI concentrated water and polar water, and the concentrated water and the polar water generated in the EDI treatment process can be completely recovered, so that the zero discharge of the cold water in the converter valve is realized. Compared with the traditional ion exchange resin method, the method and the device have the advantages of stable water quality, long maintenance period, reliable operation and the like. Compared with the traditional EDI or membrane treatment technology, the invention does not need to discharge waste water and realizes the zero discharge of the internal cooling water. In conclusion, the invention has the characteristics of good water quality, higher operation reliability, good economy and the like.
Drawings
Fig. 1 is a schematic flow chart of a water circuit of a cooling water quality control device in a converter valve according to embodiment 1 of the present invention.
Illustration of the drawings:
1. an EDI module; 2. a cold water tank in the converter valve; 3. a circulating water tank; 4. a degasser; 5. an ion exchanger; 6. a feed pump; 7. a valve; 8. a vacuum pump.
Detailed Description
The invention is further described below with reference to the drawings and specific preferred embodiments of the description, without thereby limiting the scope of protection of the invention. The materials and equipment used in the following examples are commercially available.
Example 1
The invention relates to a method for controlling the quality of cooling water in a converter valve, which comprises the following steps: firstly, the bypass of the EDI module 1 is adopted to treat cold water in the converter valve, the produced water of the EDI module 1 is sent back to the cold water tank 2 in the converter valve, the concentrated water and the extreme water of the EDI module 1 are sent to a circulating water tank 3, the mixed water in the circulating water tank 3 is degassed through a degassing device 4, the degassed cold water is subjected to ion exchange treatment through an ion exchanger 5, the obtained deionized cold water is sent to the EDI module 1 to be continuously treated, qualified EDI produced water is obtained, and zero discharge of the cold water in the converter valve can be realized.
In this embodiment, the EDI module 1 is a siemens IP-LXM 45Z EDI module, and has a water production resistivity of 18M Ω · cm.
In this example, the contents of oxygen, carbon dioxide and other gases in the cold water treated by the degasser 4 were all less than 2ppb.
In this embodiment, the degassing device 4 is provided with a degassing membrane, which is a hollow fiber polypropylene gas-liquid separation membrane, and has a degassing efficiency of 99.999%.
In this embodiment, the ion exchanger 5 is a mixed bed composed of a hydroxide-type anion exchange resin and a hydrogen-type cation exchange resin.
In this embodiment, a stirrer is provided in the circulation water tank 3.
The invention discloses a water quality control device for cooling water in a converter valve, which comprises a cold water tank 2 in the converter valve, an EDI module 1, a circulating water tank 3, a degassing device 4 and an ion exchanger 5, wherein the EDI module 1 is provided with a first water inlet, a second water inlet, a produced water outlet, an extreme water outlet and a concentrated water outlet, the water outlet of the cold water tank 2 in the converter valve is communicated with the first water inlet of the EDI module 1, the produced water outlet of the EDI module 1 is communicated with a water return port of the cold water tank 2 in the converter valve, the extreme water outlet and the concentrated water outlet of the EDI module 1 are respectively communicated with the water inlet of the circulating water tank 3, and the water outlet of the circulating water tank 3, the degassing membrane 4, the ion exchanger 5 and the second water inlet of the EDI module 1 are sequentially communicated.
In this embodiment, a water feed pump 6 and a valve 7 are respectively disposed between the water outlet of the cold water tank 2 in the converter valve and the first water inlet of the EDI module 1, between the water outlet of the circulating water tank 3 and the degassing device 4, and between the ion exchanger 5 and the second water inlet of the EDI module 1.
In this embodiment, the degassing device 4 is provided with an exhaust port, which is in communication with a vacuum pump 8.
In this embodiment, the above components may be communicated by a pipe. Valves 7 are arranged on a pipeline between a produced water outlet of the EDI module 1 and a water return port of the cold water tank 2 in the converter valve, a pipeline between a concentrated water outlet of the EDI module 1 and a water inlet of the circulating water tank 3, a pipeline between an extreme water outlet of the EDI module 1 and a water inlet of the circulating water tank 3, and a pipeline between the degassing device 4 and the ion exchanger 5.
In this embodiment, two ion exchangers 5 are provided, and the two ion exchangers 5 are arranged in parallel, one for each use.
The working principle and the working process of the device of the embodiment are as follows, and the water path flow schematic diagram is shown in fig. 1:
the EDI module 1 bypasses and processes cold water in the converter valve of a cold water tank 2 (called as an internal valve cold water tank for short) in the converter valve to obtain EDI produced water with qualified water quality, and the EDI produced water returns to the cold water tank in the converter valve to finish the treatment of the cold water in the converter valve. EDI concentrated water and utmost point water enter the circulating water tank 3, the mixed water in the circulating water tank 3 is degassed through a degassing device 4 containing a degassing membrane, and the mixed water is treated by an ion exchanger 5 after degassing and then enters the EDI module 1 for further treatment to obtain qualified EDI produced water.
In the embodiment, the method and the device can purify the converter valve in the converter station, so that the water quality of the internal cooling water meets the requirement, and meanwhile, the zero emission of the internal cooling water is realized, the operation and maintenance work is more intelligent, and the operation and maintenance workload and cost are lower.
The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner. Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make many possible variations and modifications to the disclosed embodiments, or equivalent modifications, without departing from the spirit and scope of the invention, using the methods and techniques disclosed above. Therefore, any simple modification, equivalent replacement, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the scope of the protection of the technical solution of the present invention.
Claims (10)
1. The method for controlling the quality of cooling water in the converter valve is characterized by comprising the steps of firstly treating cooling water in the converter valve by adopting an EDI module (1) as a bypass, sending produced water of the EDI module (1) back to a cold water tank (2) in the converter valve, sending concentrated water and extreme water of the EDI module (1) to a circulating water tank (3), degassing mixed water in the circulating water tank (3) through a degassing device (4), carrying out ion exchange treatment on the degassed cooling water through an ion exchanger (5), and sending the obtained deionized cooling water to the EDI module (1) for continuous treatment to obtain qualified EDI produced water.
2. The method for controlling the quality of cooling water in a converter valve according to claim 1, wherein the water production resistivity of the EDI module (1) is not less than 18 MOmega-cm.
3. The method for controlling the quality of cooling water in a converter valve according to claim 1, wherein the content of each gas in the cooling water after being treated by the degasser (4) is less than 2ppb.
4. The method for controlling the quality of cooling water in a converter valve according to any one of claims 1 to 3, wherein a degassing membrane is provided in the degassing device (4), and the degassing membrane is a gas-liquid separation membrane, and has a degassing efficiency of more than 99.99%.
5. The method for controlling the quality of cooling water in a converter valve according to any one of claims 1 to 3, wherein the ion exchanger (5) is a mixed bed of an anion exchange resin in the hydroxide form and a cation exchange resin in the hydrogen form.
6. The utility model provides a cooling water quality control device in converter valve, its characterized in that, cold water tank (2), EDI module (1), circulation water tank (3), degasser (4) and ion exchanger (5) in the converter valve, EDI module (1) is equipped with first water inlet, second water inlet, produces water export, utmost point water export and dense water export, in the converter valve the delivery port of cold water tank (2) with the first water inlet intercommunication of EDI module (1), the product water export of EDI module (1) with the return water mouth intercommunication of cold water tank (2) in the converter valve, the utmost point water export and the dense water export of EDI module (1) respectively with the water inlet intercommunication of circulation water tank (3), the delivery port of circulation water tank (3) degasification membrane (4), ion exchanger (5) the second water inlet of EDI module (1) communicates in proper order.
7. The device for controlling the quality of cooling water in a converter valve according to claim 6, wherein a water feed pump (6) and a valve (7) are arranged between a water outlet of the cold water tank (2) in the converter valve and the first water inlet of the EDI module (1), between a water outlet of the circulating water tank (3) and the degassing device (4), and between the ion exchanger (5) and the second water inlet of the EDI module (1).
8. Device for controlling the water quality of the cooling water in converter valves according to claim 6 or 7, characterized in that said degassing device (4) is provided with an exhaust port communicating with a vacuum pump (8).
9. The device for controlling the quality of cooling water in a converter valve according to claim 6 or 7, wherein valves (7) are arranged on a pipeline between a produced water outlet of the EDI module (1) and a water return port of the cold water tank (2) in the converter valve, a pipeline between a concentrated water outlet of the EDI module (1) and a water inlet of the circulating water tank (3), a pipeline between a polar water outlet of the EDI module (1) and a water inlet of the circulating water tank (3), and a pipeline between the degassing device (4) and the ion exchanger (5).
10. Device for controlling the water quality of cooling water in converter valves according to claim 6 or 7, characterized in that there are two ion exchangers (5), and the two ion exchangers (5) are arranged in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211617965.6A CN115818886A (en) | 2022-12-15 | 2022-12-15 | Method and device for controlling quality of cooling water in converter valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211617965.6A CN115818886A (en) | 2022-12-15 | 2022-12-15 | Method and device for controlling quality of cooling water in converter valve |
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| Publication Number | Publication Date |
|---|---|
| CN115818886A true CN115818886A (en) | 2023-03-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211617965.6A Pending CN115818886A (en) | 2022-12-15 | 2022-12-15 | Method and device for controlling quality of cooling water in converter valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115818886A (en) |
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2022
- 2022-12-15 CN CN202211617965.6A patent/CN115818886A/en active Pending
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