CN113045057A - Indirect cooling water quality treatment device and process - Google Patents
Indirect cooling water quality treatment device and process Download PDFInfo
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- CN113045057A CN113045057A CN202110506932.3A CN202110506932A CN113045057A CN 113045057 A CN113045057 A CN 113045057A CN 202110506932 A CN202110506932 A CN 202110506932A CN 113045057 A CN113045057 A CN 113045057A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- 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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- 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
- C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
- C02F2001/422—Treatment of water, waste water, or sewage by ion-exchange using anionic exchangers
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- 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
- C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
- C02F2001/425—Treatment of water, waste water, or sewage by ion-exchange using cation exchangers
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- 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
- C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
- C02F2001/427—Treatment of water, waste water, or sewage by ion-exchange using mixed beds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/02—Non-contaminated water, e.g. for industrial water supply
- C02F2103/023—Water in cooling circuits
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
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- Treatment Of Water By Ion Exchange (AREA)
Abstract
The invention discloses a water quality treatment process of indirect cooling water, which comprises the steps of removing suspended matters in indirect cooling water by using a microporous filtering device, removing anions and cations in the indirect cooling water by using an ion exchange process, and regulating and controlling the pH value of the indirect cooling water. An indirect cooling water quality treatment device for implementing the process comprises a microporous filter, a pH control device and an ion exchange system; the microporous filter, the pH control device and the ion exchange system are sequentially connected in series, and a water inlet pipe of the microporous filter is connected with an indirect cooling water supply main pipe; and the water outlet pipe of the ion exchange system is connected with an indirect cooling water return pipe. The device can effectively improve the quality of indirect cooling water of the air cooling unit, and achieves the purposes of controlling the pH value and the conductivity of the indirect cooling water and inhibiting the corrosion of metal equipment of an indirect cooling water system.
Description
Technical Field
The invention relates to the technical field of water treatment, in particular to a water quality treatment device and process for indirect cooling water.
Background
The thermal power plant constructed in the coal-rich and water-poor area generally adopts an air cooling unit to save water resources. At present, an air cooling system for a unit of a thermal power plant mainly comprises a direct air cooling system and an indirect air cooling system. In the direct air cooling system, air directly cools steam in a condenser of the generator set; in the indirect air cooling system, air is used for cooling steam in a condenser of the generator set by taking circulating flowing demineralized water as a heat transfer medium, the demineralized water used as the heat transfer medium is called 'indirect cooling water', the indirect cooling water is called 'indirect cooling water' for short, and a system for accommodating the circulating flowing demineralized water and transferring heat energy is called 'indirect cooling water system'. The indirect cooling water system mainly comprises an indirect cooling water circulating pump, a condenser, an air cooling radiator, an indirect cooling water pipeline and the like. These devices generally contain concentrated metals: aluminum alloy (air-cooled radiator); ② carbon steel (indirect cooling water pipeline); and thirdly, stainless steel (condenser heat exchange tubes) and the like. Different materials have different passivation pH value ranges in indirect cooling water, wherein the passivation pH value range of aluminum is 4.6-8.5 in general, and the passivation pH value range of carbon steel is 7.5-8.5. In actual engineering, an indirect cooling water system controls the pH value of indirect cooling water to be 6.7-8.0 according to the requirements of an air cooling radiator (aluminum fin) manufacturer, so that carbon steel (an indirect cooling water pipeline) is easily corroded, iron ions are dissolved into the indirect cooling water, and the indirect cooling water is high in iron ion concentration and unqualified in conductivity and turbidity. Meanwhile, the indirect cooling water with high iron ion concentration can accelerate the electrochemical corrosion of metal aluminum, so that the concentration of aluminum ions in the indirect cooling water exceeds the standard. Therefore, in order to simultaneously passivate metals (aluminum and iron) in an indirect cooling water system, the pH value of the indirect cooling water is required to be controlled to be 7.5-8.5, the conductivity is less than 10 mu S/cm, and the turbidity is less than 10 NTU. However, in practical engineering, the pH value of the indirect cooling water can reach above 9, which causes corrosion of metallic aluminum in the indirect cooling water system, resulting in higher conductivity and turbidity than the control requirements. Therefore, the water quality treatment of the indirect cooling water is a technical problem of the prior indirect cooling water system.
At present, the solutions are: the indirect cooling water for the demineralized water replacement part is disclosed. The pH value of the indirect cooling water can be quickly reduced by mixing the desalted water with the pH value less than 7 with the indirect cooling water with high pH value. But is economically expensive; and the indirect cooling water is treated by a cation exchange process bypass. When containing Fe3+、Al3+When the cation indirect cooling water and the cation exchange resin are subjected to ion exchange reaction, a large amount of hydrogen ions are released from treated effluent, the pH value of the effluent is 3-4, and the pH value of the indirect cooling water can be rapidly reduced. When the pH value of the indirect cooling water is lower than 7.0, the cation bed stops running, the pH value of the indirect cooling water rises again until the pH value of the indirect cooling water is more than 8.5, the cation bed indirect cooling water treatment device is restarted, and indirect cooling is reducedBut the water pH. The operation mode leads the change curve of the pH value of the indirect cooling water along with the time to be zigzag, the pH value of the indirect cooling water is always in the change process, the aluminum fin radiating fins in the indirect cooling water system and the surface passive film of the carbon steel of the water conveying pipeline are in an unstable state, and the corrosion of metals such as iron, aluminum and the like in the indirect cooling water cannot be effectively prevented. In addition, the cation exchange process cannot remove Cl in the indirect cooling water-Plasma, indirect cooling of Cl in water-The plasma can accelerate the corrosion of metals such as iron and aluminum in the indirect cooling water system, and leads to high conductivity of the indirect cooling water and unqualified water quality of the indirect cooling water.
Therefore, it is an urgent problem to be solved by those skilled in the art to provide an indirect cooling water quality treatment apparatus and process capable of inhibiting corrosion of metal equipment of an indirect cooling water system.
Disclosure of Invention
In view of the above, the invention discloses an indirect cooling water quality treatment process and an indirect cooling water quality treatment device for inhibiting corrosion of metal equipment of an indirect cooling water system by treating indirect cooling water through a bypass.
In order to achieve the purpose, the invention adopts the following technical scheme:
the indirect cooling water quality treatment process is characterized in that an anion exchange process is adopted to remove Cl in indirect cooling water-、SO4 2-Plasma of anions releasing OH-(ii) a Method for removing Fe in indirect cooling water by adopting cation exchange process3+、Al3+、Na+Isocationally, liberating H+. Meanwhile, the purposes of purifying the indirect cooling water, reducing the conductivity of the indirect cooling water, controlling the pH value of the indirect cooling water and preventing the corrosion of metal equipment of an indirect cooling water system are achieved by controlling the quantity ratio of the used anion exchange resin and cation exchange resin, the water treatment amount of an ion exchange process and other measures.
Preferably, the indirect cooling water quality treatment process comprises the following steps:
the method comprises the steps that part of indirect cooling water led out from a main indirect cooling water supply pipe is subjected to removal of suspended matters in the indirect cooling water through a microporous filter, and the flow rate of the indirect cooling water is controlled by a pH control device;
controlling the flow of the indirect cooling water entering the ion exchange system through an adjustable flowmeter after the indirect cooling water is treated by the pH control device controller;
enabling the indirect cooling water to enter an ion exchange system, and enabling anion exchange resin in the ion exchange system to perform exchange reaction with anions in the indirect cooling water to remove Cl in the indirect cooling water-、SO4 2-Plasma of anions with simultaneous release of OH-(ii) a The cation exchange resin in the ion exchange system and the cations in the indirect cooling water are subjected to exchange reaction to remove Fe in the indirect cooling water3+、Al3+Isocationally while releasing H+The treated indirect cooling water enters an indirect cooling water return pipe;
and fourthly, injecting the indirect cooling water into an indirect cooling water return pipe after the indirect cooling water is processed in the steps (1) - (3) continuously.
The invention also provides an indirect cooling water quality treatment device which comprises a microporous filter, a pH control device and an ion exchange system;
the microporous filter, the pH control device and the ion exchange system are sequentially connected in series, and a water inlet of the microporous filter is connected with an indirect cooling water supply main pipe; and the water outlet of the ion exchange system is connected with an indirect cooling water return pipe.
Preferably, the microporous filter is a filtering device with the pore diameter of less than 50 μm and is used for intercepting suspended matters in the indirect cooling water;
the water inlet of the microporous filter is connected with an indirect cooling water supply main pipe, and the water outlet of the microporous filter is connected with a pH control device.
The pH control device comprises a pH electrode, a pH signal processing controller and an adjustable flowmeter; the pH electrode is arranged on a connecting pipeline of the microporous filter and the adjustable flowmeter; the pH signal processing controller is respectively electrically connected with the pH electrode and the adjustable flowmeter; the other end of the adjustable flowmeter is connected with the ion exchange system.
The pH control device is matched with the ion exchange system to control the pH value of indirect cooling water by adjusting the flow of bypass treatment indirect cooling water.
Preferably, the ion exchange system comprises an anion exchanger filled with an anion exchange resin, a cation exchanger filled with a cation exchange resin and a mixed ion exchanger filled with a mixed ion exchange resin. The quantity ratio of the anion exchange resin and the cation exchange resin in the ion exchange system is determined according to the quality of the meta-cold water. The ion exchange system in the indirect cooling water quality treatment device has the following three combination and connection modes:
the method comprises the steps of firstly, adjusting a flowmeter → an anion exchanger → a cation exchanger → an indirect cooling water return pipe;
the adjustable flow meter → the cation exchanger → the anion exchanger → the indirect cooling water return pipe;
the adjustable flowmeter → the mixed ion exchanger → the indirect cooling water return pipe.
The beneficial effects of the invention are as follows: the filter of the invention intercepts suspended matters in the indirect cooling water, and ensures that the ion exchange resin in the ion exchange system is not polluted by the suspended matters in the indirect cooling water; the pH control device is matched with the ion exchange system to control the pH value of indirect cooling water by regulating the flow rate of bypass treatment indirect cooling water and remove Fe in the indirect cooling water of the whole system through the ion exchange system3+、Al3+Cation and Cl-、SO4 2-The anion gradually reduces the conductivity of indirect cooling water in the whole system, the pH value tends to a preset value, the aim of preventing metal equipment of the indirect cooling water system from being corroded is fulfilled, and the technical problem of the traditional indirect cooling water system is solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 of the accompanying drawings is a schematic structural view of embodiment 1 of the present invention;
FIG. 2 of the accompanying drawings is a schematic structural view of embodiment 2 of the present invention;
FIG. 3 of the accompanying drawings is a schematic structural view of embodiment 3 of the present invention;
FIG. 4 of the accompanying drawings is a schematic connection diagram of the components of the pH control device of the present invention;
1 is a microporous filter, 2 is a pH control device, 3 is an ion exchange system, 4 is an indirect cooling water cooling tower, 5 is an indirect cooling water circulating pump, 6 is an indirect cooling water supply main pipe, 7 is a generator condenser and 8 is an indirect cooling water return pipe;
21 is a pH electrode, 22 is a pH signal processing and controlling device, and 23 is an adjustable flowmeter;
an anion exchanger 31, a cation exchanger 32 and a mixed ion exchanger 33.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
In this embodiment, an indirect cooling water quality treatment apparatus includes: a microporous filter 1, a pH control device 2 and an ion exchange system 3.
The microporous filter 1 adopts a self-cleaning microporous filter with the filtering precision of 10 mu m, a water inlet is connected with an indirect cooling water supply main pipe, a water outlet is connected with a pH control device, and suspended matters, particularly iron oxide suspended solids, in indirect cooling water are intercepted.
The pH control device 2 comprises a pH electrode 21, a signal processing controller 22 and an adjustable flowmeter 23, wherein the pH electrode 21 is arranged on a connecting pipeline of the microporous filter 1 and the adjustable flowmeter 23; the pH signal processing controller is respectively electrically connected with the pH electrode and the adjustable flowmeter 23; the other end of the adjustable flow meter 23 is connected to the ion exchange system. The pH control device is matched with the ion exchange system to control the pH value of the indirect cooling water by adjusting the flow of the bypass treatment indirect cooling water. The specific method comprises the following steps: the pH control device 2 obtains a pH value signal of the indirect cooling water through a pH electrode 21, and controls the processing flow entering an ion exchange system through an adjustable flowmeter 23 after being processed by a pH signal processing controller 22, so as to achieve the purpose of controlling the pH value of the indirect cooling water, wherein the control basis is the difference value between the actual pH value of the indirect cooling water and the preset pH value, and the larger the difference value is, the larger the control flow is; when the difference is equal to or less than zero, the output flow maintains the minimum flow. The minimum flow is determined by the actual debugging working condition of the indirect cooling water quality treatment device.
The ion exchange system 3 comprises an anion exchanger 31 and a cation exchanger 32, and adopts a connection mode of 'adjustable flow meter → anion exchanger → cation exchanger → indirect cooling water return pipe', and uses strong base anion exchange resin and weak acid type cation exchange resin, and the volume ratio is 1: 1. The working process is as follows: carrying out anion exchange reaction: ROH + A-＝RA+OH-(wherein R represents an ion exchange material, A)-Represents anions, the anions in the indirect cooling water being mainly Cl-、SO4 2-Etc.), anions in the indirect cooling water are replaced with OH-(ii) a (ii) cation exchange reaction: RH + C+＝RC+H+(wherein R represents an ion exchange resin, C+Representing cations, the cations in the indirect cooling water being mainly Fe3+、Al3+、Na+Etc.), the cations in the indirect cooling water are replaced with H+(ii) a ③ H produced by the two exchange reactions+And OH-A neutralization reaction takes place: OH group-+H+＝H2O。
The working process of the indirect cooling water quality treatment process and the device comprises the following steps:
the indirect cooling water is treated by a bypass led out from a main indirect cooling water supply pipe 6, and suspended matters are intercepted by a microporous filter 1;
the pH electrode 21 obtains a pH signal of the indirect cooling water, and the pH signal is processed by the pH signal processing and controlling device 22 to form a water quantity control signal which is sent to the adjustable flowmeter 23. The adjustable flow meter 23 adjusts the amount of water treated by the indirect cooling water bypass according to the water amount control signal, and controls the pH value of the indirect cooling water together with the ion exchange system 3; the flow control is based on the difference between the actual pH value of the indirect cooling water and the preset pH control value, and the larger the difference is, the larger the flow is; when the difference is equal to or less than zero, the output flow maintains the minimum flow. The minimum flow is determined by the actual debugging working condition of the indirect cooling water quality treatment device;
the indirect cooling water after the bypass treatment enters an anion exchanger in the ion exchange system 3 for anion exchange: ROH + Cl－+SO4 2－→RCl+RSO4+OH－(wherein R represents an ion exchange resin) and removing Cl in the indirect cooling water－、SO4 2－Plasma of anions with simultaneous release of OH-；
The bypass-treated indirect cooling water enters a cation exchanger in the ion exchange system 3 to be subjected to cation exchange: RH + Al3++Fe3++Na+→RNa+RAl+RFe+H+(wherein R represents ion exchange resin) to remove Al in the indirect cooling water3+、Fe3+、Na+Isocationally while releasing H+All the neutralization step is carried out, and OH generated by the ion exchange reaction-The pH value of the indirect cooling water of the bypass treatment is less than 7;
sixthly, performing bypass treatment on indirect cooling water, suspended matters and Cl－、SO4 2－Plasma, Al3+、Fe3+、Na+When the cations are removed, the water quality is purified, the conductivity is reduced, the pH value is less than 7, the water returns to the main indirect cooling water system through an indirect cooling water return pipe 8, the impurity ion concentration and the conductivity of the indirect cooling water in the whole system are gradually reduced, and the pH value tends to a preset value.
In the present embodiment, the anion exchanger 31 is at the front and the cation exchanger 32 is at the back, and the advantages are: all anions in the indirect cooling water are exchanged intoOH-And is reacted with H in a cation exchanger 32+Water is generated by neutralization reaction, and the water discharged by-pass treatment does not contain Cl-、SO4 2-Strong acid substances formed by plasma lead to local corrosion when the bypass treatment effluent is added into the indirect cold water main system.
The embodiment is suitable for the water quality working condition that the pH value of the indirect cooling water is higher, can adjust the pH value of the indirect cooling water simultaneously, removes impurity ions in the indirect cooling water, and reduces the conductivity of the indirect cooling water.
Example 2
In this embodiment, the same components as in embodiment 1 are included in an indirect cooling water treatment apparatus comprising: a microporous filter 1, a pH control device 2 and an ion exchange system 3. Except that the order of connection of the anion exchanger 31 and the cation exchanger 32 in the ion exchange system 3 is reversed, that is, the cation exchanger 32 is in front and the anion exchanger 31 is in back, and the connection mode "variable flow meter → cation exchanger → anion exchanger → indirect cooling water return pipe" is adopted.
This embodiment has the advantage that the indirect cooling water first exchanges all the cations in the cation exchanger 32 into H+Then enters an anion exchanger 31 filled with an anion exchange material in the hydroxide form, and all free H+Will all exchange with OH generated by anion in anion exchanger 31－Produces water generated by neutralization reaction without free H+The effluent treated by the anion exchanger 31 enters an indirect cooling water system, and the ion exchange system does not generate acid water to cause local corrosion of the indirect cooling water system.
The embodiment is suitable for the water working condition that the pH value of the indirect cooling water is normal, can remove impurity ions in the indirect cooling water, and reduces the conductivity of the indirect cooling water.
Example 3
In this embodiment, the same components as in embodiments 1 and 2 are used in an indirect cooling water treatment apparatus, including: a microporous filter 1, a pH control device 2 and an ion exchange system 3. However, the ion exchange system 3 includes only the mixed ion exchanger 33, and adopts a connection mode of "adjustable flow meter → mixed ion exchanger → indirect cooling water return pipe".
The functions and operation of the microporous filter 1 and the pH control device 2 in this example are the same as those in examples 1 and 2. However, the ion exchange resin in the ion exchange system 3 is packed differently, and the ion exchange process is also different:
the method comprises the following steps: the volume ratio of the cation exchange resin and the anion exchange resin packed in the mixed ion exchanger 33 is determined according to the pH of the meta-cold water: the pH value of the meta-cold water is more than 8.5, and the volume ratio of the cation exchange resin to the anion exchange resin is 1: 1; the pH value of the meta-cold water is less than 8.5, and the volume ratio of the cation exchange resin to the anion exchange resin is 1: 2. When the pH value of the indirect cooling water is more than 8.5 and the anion concentration in the indirect cooling water is low, the mixed bed ion exchanger can be only provided with cation exchange resin.
And an ion exchange process. The bypass treatment indirect cold water after being filtered by the microporous filter 1 enters the mixed ion exchanger 33 simultaneously filled with hydrogen type cation exchange resin and hydroxide type anion exchange resin, and the following three reactions occur: (ii) ROH + Cl－+SO4 2－→RCl+RSO4+OH－(wherein R represents an ion exchange resin) and removing Cl in the indirect cooling water－、SO4 2－Plasma of anions with simultaneous release of OH-；②RH+Al3++Fe3++Na+→RNa+RAl+RFe+H+(wherein R represents ion exchange resin) to remove Al in the indirect cooling water3+、Fe3+、Na+Isocationally while releasing H+(ii) a ③ reaction and OH produced by reaction-And H+A neutralization reaction takes place: OH group-+H+＝H2And O. After the meta-cold water is treated by the mixed ion exchanger 33, suspended substances and Cl are generated－、SO4 2－Plasma, Al3+、Fe3+、Na+Removing the cations, purifying water, and generating OH by two exchange reactions-And H+And the pH value of the indirect cooling water is less than or equal to 7.
This implementationThe advantage of this example is that the cations and anions in the indirect cooling water are removed in the mixed ion exchanger 33 and the OH produced by the anion exchange-And H produced by cation exchange+Also in the mixed ion exchanger 33, a neutralization reaction is caused to produce H2O, high water quality treatment efficiency and good effect.
The results of the simulation tests for inventive examples 1-3 are given in the following table:
| indirect cooling water quality index | pH value | Conductivity (μ S/cm) |
| Before implementation | 8.7 | 16.7 |
| Example 1 | 7.7～8.3 | ＜2.5 |
| Example 2 | 8.0～8.5 | ＜5.0 |
| Example 3 | 7.3～7.8 | ＜1.9 |
From the above table 1, it can be seen that the pH can be reduced by using the solution of the present invention.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. The indirect cooling water quality treatment process is characterized in that indirect cooling water is treated by a bypass by adopting the following process method:
(1) determining the bypass treatment water quantity according to the pH value detection signal of the indirect cooling water;
(2) removing suspended matters in the intercooling water by using a microporous filtering device;
(3) removing Cl in indirect cooling water by adopting anion exchange process－、SO4 2-Plasma anions;
(4) method for removing Fe in indirect cooling water by adopting cation exchange process3+、Al3+Aliphatics, and release of H+Regulating and controlling the pH value of the indirect cooling water.
The cation exchange resin adopted in the cation exchange process is weak acid type cation exchange resin.
2. The indirect cooling water quality treatment process according to claim 1, which is characterized by comprising the following steps:
(1) part of indirect cooling water led out from the indirect cooling water supply main pipe is subjected to removal of suspended matters in the indirect cooling water through a microporous filter, and the water quantity of the indirect cooling water is controlled by a pH control device;
(2) the pH control device controller measures the pH value signal of the indirect cooling water according to the pH electrode and controls the flow entering the ion exchange system through the adjustable flowmeter;
(3) the indirect cooling water enters an ion exchange system, and anion exchange resin in the ion exchange system and anions in the indirect cooling water are subjected to exchange reaction to remove Cl in the indirect cooling water-、SO4 2-Plasma of anions with simultaneous release of OH-(ii) a The cation exchange resin in the ion exchange system and the cations in the indirect cooling water are subjected to exchange reaction to remove Fe in the indirect cooling water3+、Al3+Isocationally while releasing H+The treated indirect cooling water enters an indirect cooling water return pipe;
(4) and (4) injecting the indirect cooling water into an indirect cooling water return pipe after the indirect cooling water is continuously treated in the steps (1) to (3).
3. An indirect cooling water quality treatment apparatus used in the process according to claim 1 or claim 2, comprising: a microporous filter, a pH control device and an ion exchange system;
the microporous filter, the pH control device and the ion exchange system are sequentially connected in series, and a water inlet of the microporous filter is connected with an indirect cooling water supply main pipe; and the water outlet of the ion exchange system is connected with an indirect cooling water return pipe.
4. The indirect cooling water quality treatment device of claim 3, wherein the microporous filter is a filtering device with a pore size of less than 50 μm and is used for intercepting suspended matters in the indirect cooling water;
the water inlet of the microporous filter is connected with an indirect cooling water supply main pipe, and the water outlet of the microporous filter is connected with a pH control device.
5. The indirect cooling water quality treatment device of claim 3, wherein the pH control device comprises a pH electrode, a pH signal processing controller and an adjustable flowmeter;
the pH electrode is arranged on a connecting pipeline of the microporous filter and the adjustable flowmeter; the pH signal processing controller is respectively electrically connected with the pH electrode and the adjustable flowmeter; the other end of the adjustable flowmeter is connected with the ion exchange system.
6. The indirect cooling water quality treatment device of claim 3, wherein the ion exchange system comprises an anion exchanger filled with anion exchange resin, a cation exchanger filled with cation exchange resin and a mixed ion exchanger filled with mixed ion exchange resin;
the adjustable flowmeter is sequentially connected with the anion exchanger, the cation exchanger and the indirect cooling water return pipe;
or the adjustable flow meter is sequentially connected with the cation exchanger, the anion exchanger and the indirect cooling water return pipe;
or the adjustable flow meter is sequentially connected with the mixed ion exchanger and the indirect cooling water return pipe.
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| CN115321642A (en) * | 2022-08-08 | 2022-11-11 | 华北电力科学研究院有限责任公司 | Method and device for inhibiting scaling of voltage-sharing electrode of cold water system in converter valve |
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