CN111735855A - Method, system, device and readable medium for acquiring pH value of cold water in generator - Google Patents
Method, system, device and readable medium for acquiring pH value of cold water in generator Download PDFInfo
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- CN111735855A CN111735855A CN202010761103.5A CN202010761103A CN111735855A CN 111735855 A CN111735855 A CN 111735855A CN 202010761103 A CN202010761103 A CN 202010761103A CN 111735855 A CN111735855 A CN 111735855A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 54
- 238000000034 method Methods 0.000 title claims abstract description 26
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 51
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 44
- 239000001257 hydrogen Substances 0.000 claims abstract description 44
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 43
- 239000000498 cooling water Substances 0.000 claims abstract description 24
- -1 hydroxide ions Chemical class 0.000 claims abstract description 8
- 229910001415 sodium ion Inorganic materials 0.000 claims abstract description 8
- 238000004590 computer program Methods 0.000 claims description 17
- 238000004364 calculation method Methods 0.000 claims description 10
- 230000006870 function Effects 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 3
- 239000012535 impurity Substances 0.000 abstract description 21
- 150000002500 ions Chemical class 0.000 abstract description 17
- 150000001450 anions Chemical class 0.000 description 8
- 150000001768 cations Chemical class 0.000 description 8
- 239000000243 solution Substances 0.000 description 7
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 6
- 238000005260 corrosion Methods 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 5
- 239000012266 salt solution Substances 0.000 description 5
- FKNQFGJONOIPTF-UHFFFAOYSA-N Sodium cation Chemical compound [Na+] FKNQFGJONOIPTF-UHFFFAOYSA-N 0.000 description 3
- 239000011734 sodium Substances 0.000 description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- JBJWASZNUJCEKT-UHFFFAOYSA-M sodium;hydroxide;hydrate Chemical compound O.[OH-].[Na+] JBJWASZNUJCEKT-UHFFFAOYSA-M 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/06—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a liquid
- G01N27/08—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a liquid which is flowing continuously
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
The invention discloses a method, a system, a device and a readable medium for obtaining the pH value of cold water in a generator, which comprises the following steps of firstly obtaining the electrical conductivity and the hydrogen conductivity of the cold water, calculating the pH value of the cold water based on the electrical conductivity and the hydrogen conductivity: the pH is C + Log (SC-1/3CC), C is a constant related to the concentration of hydroxide ions and sodium ions when pure water is treated by adding sodium hydroxide into the pure water, CC is the conductivity, and SC is the hydrogen conductivity; the inner cooling water is not the theoretical state of pure water plus sodium hydroxide, and more or less impurity ions exist in the inner cooling water; in the formula of the invention, in the pH value of 8.61+ log (SC-1/3CC), (SC-1/3CC) is used for deducting the contribution of impurity ions to the conductivity, and the contribution value of sodium hydroxide to the conductivity is accurately calculated, thereby more accurately calculating the pH value of the inner cooling water.
Description
Technical Field
The invention belongs to the technical field of monitoring of chemical water of a generator, and particularly relates to a method, a system, a device and a readable medium for acquiring a pH value of cold water in the generator.
Background
One of the purposes of various treatment methods of the cold water in the generator is to control the corrosion of the hollow copper wire of the generator by regulating the pH value of the cold water to be slightly alkaline. When the pH value is increased from 7 to 8, the corrosion rate of copper can be reduced to 1/6; when the corrosion rate is increased from 8 to 8.5, the corrosion rate is reduced to 1/15.
The problems existing in the prior art are as follows: 1. the generator inner cooling water and its supplementary water source are low conductivity water solution H+The concentration is very low, the buffering property is very poor, and the pH value is difficult to accurately measure; 2. if the pH value is improperly controlled, corrosion and scaling are easily caused, the normal operation of the generator is endangered, and the accurate control of the pH value is very important; 3. the relation between the conductivity of the low-conductivity aqueous solution and the pH value can be estimated only according to a cold water treatment guide rule graph A.1 in a DL/T1039-2016 generator by the original method;
aiming at the pure water added with ammonia in a power plant, Swan of Switzerland adopts a three-in-one meter, and the pH value is calculated by measuring the conductivity and the hydrogen conductivity, aiming at the inapplicability of sodium hydroxide treatment or a sodium type mixed bed.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a method, a system, a device and a storage medium for acquiring the pH value of internal cooling water of a generator, which can acquire the accurate pH value of the internal cooling water, and the accuracy of the internal cooling water is higher than that of a measured value.
In order to achieve the purpose, the invention adopts the technical scheme that the method for obtaining the pH value of the cold water in the generator comprises the following steps of firstly obtaining the electrical conductivity and the hydrogen conductivity of the cold water, calculating the pH value of the cold water based on the electrical conductivity and the hydrogen conductivity: pH ═ C + Log (SC-1/3CC), C is a constant relating to the concentration of hydroxide ions and sodium ions when pure water is treated with sodium hydroxide, CC is the electrical conductivity, and SC is the hydrogen conductivity.
C＝8.61。
The first conductivity detector and the second conductivity detector are respectively arranged at the inlet and the outlet of the hydrogen column, the first conductivity detector is used for detecting conductivity value, the second conductivity detector is used for detecting hydrogen conductivity, the first conductivity detector and the second conductivity detector adopt conductivity meters with temperature compensation function, and detection points are arranged on a pipeline with unobstructed water flow.
Detecting at 25 + -0.2 deg.C, the water flow rate is more than 300 mm/min.
A system for accurately acquiring the pH value of cold water in a generator comprises a data acquisition module, a data calculation module and a result output module, wherein the data acquisition module is used for acquiring the conductivity and the hydrogen conductivity of the cold water detected on line; the data calculation module is used for calculating to obtain an accurate pH value according to the conductivity, the hydrogen conductivity and a calculation formula of pH (C + log) (SC-1/3CC), and the result output module is used for outputting a pH value result.
Comprises a memory, a processor and a computer program stored in the memory and capable of running on the processor, wherein the processor executes the computer program to realize the method for acquiring the pH value of the cold water in the generator.
The system also comprises a result output part, and the result output part is connected with the processor through an I/O interface.
A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the method of obtaining pH of cooling water in a generator according to the invention.
Compared with the prior art, the invention has at least the following beneficial effects: the inner cooling water is not the theoretical state of pure water plus sodium hydroxide, and more or less impurity ions exist in the inner cooling water; in the formula of the invention, in the pH value of C + log (SC-1/3CC), (SC-1/3CC) is used for deducting the contribution of impurity ions to the conductivity, and the contribution value of sodium hydroxide to the conductivity is accurately calculated, so that the pH value of the inner cooling water is more accurately calculated.
Drawings
Fig. 1 is a schematic view for monitoring electrical conductivity and hydrogen conductivity.
1-a first conductivity detector, 2-a hydrogen column, 3-a second conductivity detector.
Detailed Description
A method for obtaining the pH value of cold water in a generator comprises the following steps of firstly obtaining the electrical conductivity and the hydrogen conductivity of the cold water, calculating the pH value of the cold water based on the electrical conductivity and the hydrogen conductivity: the pH is C + log (SC-1/3CC), C is a constant relating to the concentration of hydroxide ions and sodium ions when pure water is treated with sodium hydroxide, CC is the electrical conductivity, and SC is the hydrogen conductivity.
Referring to fig. 1, a first conductivity detector 1 and a second conductivity detector 3 are respectively disposed at an inlet and an outlet of a hydrogen column 2, the first conductivity detector 1 is used for detecting a conductivity value, the second conductivity detector 3 is used for detecting a hydrogen conductivity, the first conductivity detector 1 and the second conductivity detector 3 employ conductivity meters with a temperature compensation function, and detection points are provided on a pipe through which water flows smoothly.
Detecting at 25 + -0.2 deg.C, the water flow rate is more than 300 mm/min.
An online conductivity meter and an online hydrogen conductivity meter in a power plant are the most accurate chemical instruments. Knowing the conductivity of the internal cooling water, the contribution of impurity ions to the conductivity is calculated according to the measured hydrogen conductivity, the difference of the two numbers is the contribution of the sodium hydroxide to the conductivity, and the pH value of the internal cooling water and the contribution of the sodium hydroxide to the conductivity are a function, so that the pH value of the internal cooling water can be calculated.
As shown in fig. 1, a water sample enters a first conductivity detector 1 through a water inlet valve to measure a conductivity value SC, and after reacting with hydrogen type cation resin through a hydrogen column 2, a hydrogen conductivity value CC is measured through a second conductivity detector 2, and the conductivity SC and the hydrogen conductivity CC are substituted into a formula: and (4) when the pH value is 8.61+ Log (SC-1/3CC), the pH value of the internal cooling water can be accurately calculated.
Various ions in the inner cold water contribute to the conductivity, anions mainly comprise OH-, HCO3-, Cl-, SO 42-and the like, cations comprise Na +, NH4+, K +, Ca2+, Mg2+, H +, Cu + and the like, the inner cold water adopts a Na type mixed bed and a treatment mode of adding NaOH to improve the pH value, the solution contributes most to the conductivity and is hydroxide ions and sodium ions, and the rest ions can be considered as impurity ions.
First, the contribution of impurity ions to the conductivity needs to be known; the hydrogen conductivity reacts on the number of impurity anions, each impurity anion corresponds to an impurity cation, and the reaction process of a water sample passing through a hydrogen column is as follows:
when the impurity cations pass through the hydrogen column RH, equivalent hydrogen ions are released;
Na+、NH4 +、K+、Ca2+、Mg2++RH→RNa、RNH4、RK、RCa、RMg+H+
impurity anion HCO3 -、Cl-And SO4 2-No reaction occurs after passing through the hydrogen column, and the hydrogen conductivity is actually the conductivity of the impurity ion salt solution after being changed into the corresponding acid solution;
the conductivity increase after the impurity ion salt solution was changed to the corresponding acid solution was analyzed as follows for the conductivity at a concentration of 10. mu. mol/L of the common ions:
| cation(s) | Conductivity μ S/cm | Anion(s) | Conductivity μ S/cm |
| NH4 + | 0.734 | HCO3 - | 0.445 |
| Na+ | 0.501 | Cl- | 0.764 |
| K+ | 0.735 | NO3 - | 0.714 |
| 1/2Ca2+ | 0.595 | 1/2SO4 2- | 0.798 |
| 1/2Mg2+ | 0.531 | 1/2CO3 2- | 0.693 |
| 1/2Cu2+ | 0.536 | 1/3PO4 3- | 0.800 |
| Mean of cation | 0.605 | Average of anion | 0.702 |
Conductivity of an impurity solution the conductivity of the impurity ion salt solution is 0.605 us/cm contributed by cations and 0.702 us/cm contributed by anions, respectively, to the conductivity of the impurity ion salt solution is 0.605+0.702 to 1.307 us/cm; after passing through the hydrogen column, the cations are all changed into H+Ions, which contribute 3.498 mu S/cm to the conductivity, and impurity anions which contribute 0.702 mu S/cm to the conductivity, the hydrogen conductivity is 3.498+ 0.702-4.2 mu S/cm, 4.2-1.307-times; namely, the hydrogen conductivity of the impurity salt solution after passing through the hydrogen column is about 3 times of the conductivity of the original solution.
And secondly, deducing a theoretical calculation formula of the pH value of the pure water and the sodium hydroxide.
The theoretical formula for adding ammonia to pure water is pH 8.57+ LogSC, and the theoretical formula for adding sodium hydroxide to pure water is as follows:
OH-in the case of a sodium hydroxide solution at a concentration of 10. mu. mol/L-Is 10-5mol/l, pH 9, SC sodium ion contribution to conductivity 0.501+1.983 (hydroxide contribution to conductivity) 2.484 μ S/cm;
that is, 9.0 ═ C (constant) + log2.484, solved to give C ═ 8.61;
namely, the theoretical calculation formula of the pH value of pure water plus sodium hydroxide is as follows: pH 8.61+ logSC
The theoretical calculation formula of pure water sodium hydroxide is shown, but the actual water contains impurity ions, the contribution of the impurity ions to the conductivity is deducted, and the contribution of the sodium hydroxide to the conductivity is SC-1/3 CC;
the formula is as follows: pH 8.61+ log (SC-1/3 CC);
as an example, if the internal cooling water conductivity is known to be 0.8 μ S/cm, the hydrogen conductivity is measured to be 0.6 μ S/cm, and the pH is 8.61+ log (SC-1/3CC) by substituting the formula, which gives a pH of 8.39.
Optionally, the invention provides a system for accurately obtaining the pH value of cooling water in a generator, which comprises a data obtaining module, a data calculating module and a result output module, wherein the data obtaining module is used for obtaining the conductivity and hydrogen conductivity of the cooling water detected on line; the data calculation module is used for calculating to obtain an accurate pH value according to the conductivity, the hydrogen conductivity and a calculation formula of pH (C + log) (SC-1/3CC), and the result output module is used for outputting a pH value result.
The invention also provides a device for accurately acquiring the pH value of the cold water in the generator, which comprises a memory, a processor and a computer program which is stored in the memory and can run on the processor, wherein the processor executes the computer program to realize the method for acquiring the pH value of the cold water in the generator; the system also comprises a result output part, and the result output part is connected with the processor through an I/O interface.
A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the method of obtaining pH of cooling water in a generator according to the invention.
The present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein. The method for obtaining the pH value of the cold water in the generator can be stored in a computer readable storage medium if the method is realized in the form of a software functional unit and sold or used as an independent product.
Based on such understanding, in the exemplary embodiment, a computer readable storage medium is also provided, all or part of the processes in the method of the above embodiments of the present invention can be realized by a computer program to instruct related hardware, the computer program can be stored in the computer readable storage medium, and when the computer program is executed by a processor, the steps of the above method embodiments can be realized. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. Computer-readable storage media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. It should be noted that the computer readable medium may contain content that is subject to appropriate increase or decrease as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media does not include electrical carrier signals and telecommunications signals as is required by legislation and patent practice. The computer storage medium may be any available medium or data storage device that can be accessed by a computer, including but not limited to magnetic memory (e.g., floppy disk, hard disk, magnetic tape, magneto-optical disk (MO), etc.), optical memory (e.g., CD, DVD, BD, HVD, etc.), and semiconductor memory (e.g., ROM, EPROM, EEPROM, nonvolatile memory (NANDFLASH), Solid State Disk (SSD)), etc.
In an exemplary embodiment, there is also provided a computer apparatus comprising a memory, a processor and a computer program stored in the memory and executable on the processor, the processor implementing the method of obtaining pH of cooling water in a generator when executing the computer program. The processor may be a Central Processing Unit (CPU), other general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, etc.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (8)
1. A method for obtaining the pH value of cold water in a generator is characterized in that firstly, the electrical conductivity and the hydrogen conductivity of the cold water are obtained, and the pH value of the cold water is calculated based on the electrical conductivity and the hydrogen conductivity: the pH is C + log (SC-1/3CC), C is a constant relating to the concentration of hydroxide ions and sodium ions when pure water is treated with sodium hydroxide, CC is the electrical conductivity, and SC is the hydrogen conductivity.
2. The method for obtaining the pH of cooling water in a generator according to claim 1, wherein C is 8.61.
3. The method for obtaining the pH value of cold water in a generator according to claim 1, wherein a first conductivity detector (1) and a second conductivity detector (3) are respectively arranged at the inlet and the outlet of the hydrogen column (2), the first conductivity detector (1) is used for detecting the conductivity value, the second conductivity detector (3) is used for detecting the hydrogen conductivity, the first conductivity detector (1) and the second conductivity detector (3) adopt conductivity meters with temperature compensation function, and the detection points are arranged on a pipeline with water flow smoothness.
4. The method for obtaining the pH value of the cooling water in the generator according to claim 1, wherein the flow rate of the water is greater than 300mm/min when measured at 25 ℃ ± 0.2 ℃.
5. A system for accurately obtaining the pH value of cold water in a generator is characterized by comprising a data obtaining module, a data calculating module and a result output module, wherein the data obtaining module is used for obtaining the conductivity and the hydrogen conductivity of the cold water detected on line; the data calculation module is used for calculating to obtain an accurate pH value according to the conductivity, the hydrogen conductivity and a calculation formula of pH (C + log) (SC-1/3CC), and the result output module is used for outputting a pH value result.
6. An apparatus for accurately obtaining pH of cooling water in a generator, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to perform the method according to any one of claims 1 to 4.
7. The apparatus of claim 6, further comprising a result output unit, wherein the result output unit is connected to the processor via an I/O interface.
8. A computer-readable storage medium, in which a computer program is stored, which, when being executed by a processor, carries out the method for obtaining a pH value of cooling water in a generator according to any one of claims 1 to 4.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115343536A (en) * | 2022-08-23 | 2022-11-15 | 浙江西热利华智能传感技术有限公司 | Power station water vapor multi-parameter cooperative measurement system and method |
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