CN115343536A - Power station water vapor multi-parameter cooperative measurement system and method - Google Patents
Power station water vapor multi-parameter cooperative measurement system and method Download PDFInfo
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- CN115343536A CN115343536A CN202211012923.XA CN202211012923A CN115343536A CN 115343536 A CN115343536 A CN 115343536A CN 202211012923 A CN202211012923 A CN 202211012923A CN 115343536 A CN115343536 A CN 115343536A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 128
- 238000005259 measurement Methods 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 10
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 55
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 55
- 239000001257 hydrogen Substances 0.000 claims abstract description 55
- 239000012528 membrane Substances 0.000 claims abstract description 45
- 238000005341 cation exchange Methods 0.000 claims abstract description 28
- 238000011033 desalting Methods 0.000 claims abstract description 18
- 239000013505 freshwater Substances 0.000 claims abstract description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 33
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 28
- 239000001569 carbon dioxide Substances 0.000 claims description 14
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 14
- 230000008929 regeneration Effects 0.000 claims description 11
- 238000011069 regeneration method Methods 0.000 claims description 11
- 238000004364 calculation method Methods 0.000 claims description 10
- 238000000691 measurement method Methods 0.000 claims description 10
- 150000001768 cations Chemical class 0.000 claims description 6
- 230000001172 regenerating effect Effects 0.000 claims 2
- 239000002028 Biomass Substances 0.000 claims 1
- 239000012141 concentrate Substances 0.000 claims 1
- 238000010612 desalination reaction Methods 0.000 claims 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 abstract description 10
- 229910021529 ammonia Inorganic materials 0.000 abstract description 5
- 238000005070 sampling Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000006356 dehydrogenation reaction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000001139 pH measurement Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/22—Measuring resistance of fluids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/12—Measuring magnetic properties of articles or specimens of solids or fluids
- G01R33/18—Measuring magnetostrictive properties
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- Condensed Matter Physics & Semiconductors (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
The invention discloses a power station water vapor multi-parameter cooperative measurement system and a method, wherein a sample inlet is communicated with a concentrated water side inlet of an electrically regenerated cation exchange device through a first conductivity sensor, an electrically regenerated cation exchange device, a second conductivity sensor, one end of a membrane in the membrane exchange device, a third conductivity sensor and a concentrated water side of an electric desalting device in sequence; an outlet at the other end of the membrane in the membrane exchange device is communicated with an inlet at the other end of the membrane in the membrane exchange device through a buffer water tank, a fresh water side of an electric desalting device and a circulating pump in sequence; the operation unit is respectively connected with the first conductivity sensor, the second conductivity sensor and the third conductivity sensor, and the system can realize the cooperative measurement of the specific conductivity, the hydrogen conductivity, the pH value, the degassed hydrogen conductivity and the ammonia root of the power station.
Description
Technical Field
The invention belongs to the technical field of water sample detection of power stations, and relates to a power station water vapor multi-parameter cooperative measurement system and method.
Background
The power station has the following problems in the use and operation and maintenance of the conductivity, the hydrogen conductivity and the pH meter due to the fact that the pH value of water quality is controlled to be high, for example, the pH value of water fed by a combustion engine is basically controlled to be 9.5-9.8, and the machine is stopped and started frequently: the domestic conductance meters all use linear temperature compensation, and the measurement accuracy is poor when the temperature deviates from a standard value, so that the foreign imported (hydrogen) conductance meters are mostly adopted in the steam system of the gas turbine power station; the pH value of water vapor is controlled to be high, the machine is stopped and started frequently, a cation exchange column is additionally arranged in front of a hydrogen conductivity meter, wherein resin needs to be replaced frequently or regenerated by hydrochloric acid, and various measurement interference problems are caused, so that the hydrogen conductivity cannot be measured continuously and accurately, and the operation and maintenance workload is huge; the pH measurement is influenced by pure water factors such as static charge, liquid junction potential and the like and on-line factors, the measurement accuracy is poor, the use time of the pH electrode is short (3-6 months), and the electrode needs to be replaced periodically.
In addition, water samples, pH meters, conductivity meters, hydrogen conductivity meters and degassed hydrogen conductivity meters are generally required for monitoring the water vapor conductivity, the hydrogen conductivity, the pH value and the degassed hydrogen conductivity, and the meter installation design not only occupies a large area of the installation space of the steam water sampling frame, has high investment cost and maintenance cost, but also causes the water vapor loss of a sampling system and is not beneficial to the energy saving and consumption reduction requirements of a power plant; when the flow of the steam-water sampling frame fluctuates, the chemical instrument at the same sampling point can cause the monitoring data distortion of the chemical instrument due to the flow change, the concentration of corrosive anions can not be accurately reflected, potential safety hazards are left for field chemical supervision, and the safety accidents of a thermodynamic system are caused.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a power station water vapor multi-parameter cooperative measurement system and a power station water vapor multi-parameter cooperative measurement method, and the system can realize cooperative measurement of the specific conductivity, the hydrogen conductivity, the pH value, the degassed hydrogen conductivity and the ammonia root of the power station.
In order to achieve the purpose, the power station water vapor multi-parameter collaborative measurement system comprises a sample inlet, an electrically regenerated cation exchange device, a membrane exchange device, an arithmetic unit, a circulating pump, an electric desalting device, a buffer water tank, a first conductivity sensor for measuring specific conductivity, a second conductivity sensor for measuring hydrogen conductivity and a third conductivity sensor for detecting degassed hydrogen conductivity;
the sample inlet is communicated with a concentrated water side inlet of the electric regeneration cation exchange device through a first conductivity sensor, the electric regeneration cation exchange device, a second conductivity sensor, one end of a membrane in the membrane exchange device, a third conductivity sensor and a concentrated water side of the electric desalting device in sequence;
an outlet at the other end of the membrane in the membrane exchange device is communicated with an inlet at the other end of the membrane in the membrane exchange device through a buffer water tank, a fresh water side of an electric desalting device and a circulating pump in sequence;
the operation unit is respectively connected with the first conductivity sensor, the second conductivity sensor and the third conductivity sensor.
The water flow directions at the two ends of the membrane in the membrane exchange device are opposite.
The sample inlet is communicated with the first conductivity sensor through a sample inlet pipe.
And an outlet of the third conductivity sensor is communicated with a concentrated water side inlet of the electric desalting device.
The invention discloses a power station water vapor multi-parameter cooperative measurement method which comprises the following steps:
1) The water sample to be measured enters a first conductivity sensor 1 to measure the specific conductivity of the water sample to be measured and then enters an electric regeneration cation exchange device to remove cations in the water sample to be measured;
2) The water sample with the cations of the water sample to be detected removed enters a second conductivity sensor to measure the hydrogen conductivity of the water sample;
3) The water sample with the hydrogen conductivity measured enters a membrane exchange device to remove carbon dioxide in the water sample;
4) The water sample to be detected with the carbon dioxide removed enters a third conductivity sensor to measure the conductivity of the degassed hydrogen;
5) The drained water of the third conductivity sensor enters the concentrated water side of the electric desalting device and the electric regeneration cation exchange device in sequence and is drained;
6) And the arithmetic unit calculates the standard specific conductivity, the hydrogen conductivity, the degassed hydrogen conductivity and the pH value of the water sample to be measured at 25 ℃ according to the specific conductivity measured by the first conductivity sensor, the hydrogen conductivity value measured by the second conductivity sensor, the degassed hydrogen conductivity value measured by the third conductivity sensor and the corresponding measured temperature.
The calculation of the conductivity values at 25 ℃ is:
1 aa) calculating the temperature compensation coefficient under the condition of preset water quality
Comprises the following steps:
ɑ＝V+(A*X)+B*Y)+C*XY)+(D*X 2 )+(E*Y 2 )+(F*X 2 Y)+(G*XY 2 )+(H*X 3 )+(I*Y 3 )+(J*X 3 Y)+(K*X 2 Y 2 )+L*XY 3 )+(M*X 4 )+(N*Y 4 ) (1)
wherein X is temperature, Y - For the measured conductivity, V is the intercept of the nonlinear curve model, A, B, C, D, E, F, G, H, I, J, K, L, M and N are constants of the regression model;
2 aa) calculation of the conductivity value DD of the medium at 25 ℃ 25 Comprises the following steps:
DD 25 ＝Y/(ɑ*(X-25)+1) (2)。
pH value of pure water medium at 25 deg.C 25 Comprises the following steps:
pH 25 ＝C 0 +lg(SC 25 )
wherein, C 0 For intercept, for a specific constant, SC 25 Is the specific conductivity value of pure water medium at 25 ℃, SC 25 According to measured specific conductivity value, temperature and medium nonlinear temperature compensationAnd (4) calculating a compensation curve.
pH value of ammonia pure water medium at 25 deg.C 25 Comprises the following steps:
pH 25 ＝C 0 +lg(SC 25 -a 1 CC 25 -a 2 CC 2 25 )
wherein, a 1 And a 2 Is a regression constant.
pH of weak sodium hydroxide medium at 25 deg.C 25 Comprises the following steps:
pH 25 ＝C 0 +lg(SC 25 -a 1 CC 25 )
wherein, SC 25 Is the specific conductivity value of weak sodium hydroxide medium at 25 ℃; CC (component C) 25 Is the hydrogen conductivity value of weak sodium hydroxide medium at 25 ℃.
Automatically adjusting a current signal of the electrically-regenerated cation exchange device according to the specific conductivity value, wherein a curve model of the current of the electrically-regenerated cation exchange device along with the change of the specific conductivity value is as follows:
I＝C 0 +a 1 SC 25 +a 2 SC 25 2 +a 3 SC 25 3
wherein, a 3 Is a regression constant.
The invention has the following beneficial effects:
when the power station water vapor multi-parameter cooperative measurement system and the power station water vapor multi-parameter cooperative measurement method are operated specifically, one water sample instrument is adopted to complete cooperative measurement of the conductivity, the hydrogen conductivity, the pH value and the degassed hydrogen conductivity; the measurement of the conductivity and the hydrogen conductivity adopts a nonlinear temperature compensation model; the device has the characteristics of small volume and simple system structure, in addition, the electrical conductivity of the hydrogen is measured by adopting the electrical regeneration cation exchange device, the resin does not need to be replaced, regenerated and washed, and the hydrogen conductivity can be quickly measured; meanwhile, the degassed hydrogen conductivity value of the water sample is accurately measured and can be compared with a standard substance, the measurement accuracy is high, and under the conditions of high water pH such as shutdown and startup, the conductivity, the hydrogen conductivity, the pH and the degassed hydrogen conductivity can be quickly, accurately and stably measured, so that power plant operators can accurately judge the water quality condition through multiple indexes and timely process the index water working condition adjustment.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Wherein, 1 is a first conductivity sensor, 2 is an electrically regenerated cation exchange device, 3 is a second conductivity sensor, 4 is a membrane exchange device, 5 is a third conductivity sensor, 6 is an electric desalting device, 7 is a circulating pump, 8 is a buffer water tank, and 9 is an operation unit.
Detailed Description
In order to make the technical solutions of the present invention better understood, 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, not all of the embodiments, and are not intended to limit the scope of the present disclosure. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, shall fall within the protection scope of the present invention.
There is shown in the drawings a schematic block diagram of a disclosed embodiment in accordance with the invention. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity of presentation. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, according to actual needs.
Referring to fig. 1, the power station water vapor multi-parameter cooperative measurement system of the present invention comprises a sample inlet, an electrically regenerated cation exchange device 2, a membrane exchange device 4, an arithmetic unit 9, a circulating pump 7, an electric desalting device 6, a buffer water tank 8, a first conductivity sensor 1 for measuring specific conductivity, a second conductivity sensor 3 for measuring hydrogen conductivity, and a third conductivity sensor 5 for detecting degassed hydrogen conductivity;
the sample inlet is communicated with the concentrated water side inlet of the electric regeneration cation exchange device 2 through a first conductivity sensor 1, an electric regeneration cation exchange device 2, a second conductivity sensor 3, one end of a membrane in a membrane exchange device 4, a third conductivity sensor 5 and the concentrated water side of an electric desalting device 6 in sequence,
the operation unit 9 is respectively connected with the first conductivity sensor 1, the second conductivity sensor 3 and the third conductivity sensor 5, and the operation unit 9 is a single chip microcomputer.
An outlet at the other end of the membrane in the membrane exchange device 4 is communicated with an inlet at the other end of the membrane in the membrane exchange device 4 through a buffer water tank 8, a fresh water side of an electric desalting device 6 and a circulating pump 7 in sequence, trace carbon dioxide in a water sample to be detected enters water without carbon dioxide at the other end through the membrane, and the trace carbon dioxide is removed; wherein the water flow directions at the two ends of the membrane are opposite.
In addition, it should be noted that the sample inlet is communicated with the first conductivity sensor 1 through a sample inlet tube; the outlet of the third conductivity sensor 5 is communicated with the concentrated water side inlet of the electric desalting device 6 through a drain pipe.
The invention discloses a power station water vapor multi-parameter cooperative measurement method which comprises the following steps:
1) The water sample to be measured enters a first conductivity sensor 1 to measure the specific conductivity of the water sample to be measured and then enters an electric regeneration cation exchange device 2 to remove cations in the water sample to be measured;
2) The water sample with the cations of the water sample to be detected removed enters a second conductivity sensor 3 to measure the hydrogen conductivity of the water sample;
3) The water sample with the measured hydrogen conductivity enters a membrane exchange device 4 to remove carbon dioxide in the water sample;
4) The water sample to be detected with carbon dioxide removed enters a third conductivity sensor 5 to measure the conductivity of the degassed hydrogen;
5) The drain water of the third conductivity sensor 5 is discharged after sequentially entering the concentrated water side of the electric desalting device 6 and the electric regeneration cation exchange device 2.
In the step 3), one end of the membrane in the membrane exchange device 4 circulates a water sample to be detected, namely, the water sample contains trace carbon dioxide, and the other end of the membrane in the membrane exchange device 4 circulates pure water prepared by a buffer water tank 8 through a circulating pump 7 and an electric desalting device 6, namely, the content of the carbon dioxide is 0. Trace carbon dioxide in a water sample to be detected enters water without carbon dioxide at the other end of the membrane in the membrane exchange device 4 through one end of the membrane in the membrane exchange device 4, so that the trace carbon dioxide is removed.
Inputting the specific conductivity value measured in the step 1), the hydrogen conductivity value measured in the step 2) and the degassed hydrogen conductivity value measured in the step 4) into an operation unit 9, calculating the pH value of the water sample to be measured by the operation unit 9, and regulating and controlling the current signal of the electrically regenerated cation exchange device 2, the specific conductivity value at 25 ℃, the hydrogen conductivity value and the degassed hydrogen conductivity value, wherein the specific calculation and regulation and control process comprises the following steps:
1a) The conductivity values at 25 ℃ were calculated as:
the arithmetic unit 9 calculates the conductivity value at 25 ℃ by utilizing a nonlinear temperature compensation model under several medium conditions according to the specific conductivity measured by the first conductivity sensor 1, the hydrogen conductivity value measured by the second conductivity sensor 3, the degassed hydrogen conductivity value measured by the third conductivity sensor 5 and the corresponding measurement temperature, and the specific process is as follows:
1 aa) first calculating the temperature compensation coefficient
Temperature compensation coefficient under specific water quality condition
Comprises the following steps:
ɑ＝V+(A*X)+B*Y)+C*XY)+(D*X 2 )+(E*Y 2 )+(F*X 2 Y)+(G*XY 2 )+(H*X
3 )+(I*Y 3 )+(J*X 3 Y)+(K*X 2 Y 2 )+L*XY 3 )+(M*X 4 )+(N*Y 4 )(1)
wherein X is temperature, Y - For the measured conductivity (uncompensated), V is the intercept of the nonlinear curve model, A, B, C, D, E, F, G, H, I, J, K, L, M and N are the constants of the regression model,however, the values of the constants were different in pure water, ammonia condition and weakly acidic condition.
2 aa) calculation of the conductivity value DD of the medium at 25 ℃ 25 Comprises the following steps:
DD 25 ＝Y/(ɑ*(X-25)+1) (2)
for example, under the condition of pure water medium, the conductivity of pure water prepared by a mixed bed under the condition of 25 ℃ is 0.0550.2 muS/cm, the same water conductivity at 35 ℃ is changed to 0.091 muS/cm, the temperature coefficient is 6.6%/° C according to the formula (1), and the temperature coefficient is substituted into the formula (2), and the conductivity of theoretical pure water at 25 ℃ is 0.055 muS/cm; when linear temperature compensation is carried out by using a common temperature coefficient of 2%/DEG C, the conductivity of theoretical pure water at 25 ℃ is 0.076 mu S/cm, and the measurement relative error is (0.076-0.055)/0.055 =38%.
The calculation model (1) is applied, the measured conductivity signal can be accurately compensated, the operation unit 9 receives the measured uncompensated specific conductivity value and temperature value, the nonlinear temperature compensation model of pure water or ammonia medium is selected to be accurate, the specific conductivity value of the medium at 25 ℃ is calculated and output; the non-linear temperature compensation model of the strong acid medium is selected for the hydrogen conductivity and the dehydrogenation conductivity value, the received conductivity signal without compensation and the temperature value are calculated, and the hydrogen conductivity and the dehydrogenation conductivity value of the medium at 25 ℃ are output.
2a) Calculation method and calculation model of pH value
The operation unit 9 calculates the pH value under each medium condition according to the specific conductivity measured by the first conductivity sensor 1 and the hydrogen conductivity measured by the second conductivity sensor 3, wherein each medium comprises pure water, ammoniacal pure water and weak sodium hydroxide medium, and the specific process is as follows:
2 aa) pH value of a pure water medium at 25 ℃ 25 Comprises the following steps:
pH 25 ＝C 0 +lg(SC 25 )
wherein, C 0 For intercept, for a specific constant, SC 25 Is the specific conductivity value of pure water medium at 25 ℃, SC 25 According to measured specific conductivity value, temperature and dielectric nonlinearityAnd calculating a temperature compensation curve.
2 ab) pH value of ammoniacal pure water medium at 25 deg.C 25 Comprises the following steps:
pH 25 ＝C 0 +lg(SC 25 -a 1 CC 25 -a 2 CC 2 25 )
wherein, a 1 And a 2 Is a regression constant.
3 ab) pH value of weak sodium hydroxide Medium at 25 deg.C 25 Comprises the following steps:
pH 25 ＝C 0 +lg(SC 25 -a 1 CC 25 )
wherein, SC 25 Is the specific conductivity value of weak sodium hydroxide medium at 25 ℃; CC (challenge collapsar) 25 Is the hydrogen conductivity value of weak sodium hydroxide medium at 25 ℃.
And selecting pure water, ammoniacal pure water or weak sodium hydroxide medium according to the water quality condition, and accurately calculating the pH value of the selected medium at 25 ℃ according to the calculation model.
3a) The invention also includes: automatically adjusting the current signal of the electrically regenerated cation exchange device 2 according to the specific conductivity value, specifically, when the specific conductivity value is smaller, the current signal of the electrically regenerated cation exchange device 2 is smaller; when the specific conductivity value of the water sample to be detected is large, the current signal of the electrically regenerated cation exchange device 2 is large, and the model of the change curve of the current along with the specific conductivity value is as follows:
I＝C 0 +a 1 SC 25 +a 2 SC 25 2 +a 3 SC 25 3
wherein, a 3 Is a regression constant.
Claims (10)
1. The power station water vapor multi-parameter cooperative measurement system is characterized by comprising a sample inlet, an electrically regenerated cation exchange device (2), a membrane exchange device (4), an arithmetic unit (9), a circulating pump (7), an electric desalting device (6), a buffer water tank (8), a first conductivity sensor (1) for measuring specific conductivity, a second conductivity sensor (3) for measuring hydrogen conductivity and a third conductivity sensor (5) for detecting degassed hydrogen conductivity;
the sample inlet is communicated with a concentrated water side inlet of the electrically regenerated cation exchange device (2) through a first conductivity sensor (1), an electrically regenerated cation exchange device (2), a second conductivity sensor (3), one end of a membrane in a membrane exchange device (4), a third conductivity sensor (5) and a concentrated water side of an electric desalting device (6) in sequence;
an outlet at the other end of the middle membrane of the membrane exchange device (4) is communicated with an inlet at the other end of the middle membrane of the membrane exchange device (4) through a buffer water tank (8), a fresh water side of an electric desalting device (6) and a circulating pump (7) in sequence;
the arithmetic unit (9) is respectively connected with the first conductivity sensor (1), the second conductivity sensor (3) and the third conductivity sensor (5).
2. The power station water vapor multi-parameter cooperative measurement system according to claim 1, characterized in that the water flow directions at the two ends of the membrane in the membrane exchange device (4) are opposite.
3. The power station water vapor multi-parameter cooperative measurement system according to claim 1, wherein the sample inlet is communicated with the first conductivity sensor (1) through a sample inlet pipe.
4. The power station steam multiparameter cooperative measurement system as recited in claim 1, wherein an outlet drain of said third conductivity sensor (5) communicates with a concentrate side inlet of an electric desalination device (6).
5. A power station water vapor multi-parameter cooperative measurement method is characterized in that the power station water vapor multi-parameter cooperative measurement system based on any one of claims 1 to 4 comprises the following steps:
1) The water sample to be measured enters a first conductivity sensor (1) to measure the specific conductivity of the water sample to be measured and then enters an electric regeneration cation exchange device (2) to remove cations in the water sample to be measured;
2) The water sample with the cations of the water sample to be detected removed enters a second conductivity sensor (3) to measure the hydrogen conductivity of the water sample;
3) The water sample after the hydrogen conductivity of the water sample is measured enters a membrane exchange device (4) to remove carbon dioxide in the water sample;
4) The water sample to be detected without carbon dioxide enters a third conductivity sensor (5) to measure the conductivity of the degassed hydrogen;
5) The drained water of the third conductivity sensor (5) enters the concentrated water side of the electric desalting device (6) and the electric regeneration cation exchange device (2) in sequence and then is drained;
6) And the arithmetic unit (9) calculates the standard specific conductivity, the hydrogen conductivity, the degassed hydrogen conductivity and the pH value of the water sample to be measured at 25 ℃ according to the specific conductivity measured by the first conductivity sensor (1), the hydrogen conductivity value measured by the second conductivity sensor (3), the degassed hydrogen conductivity value measured by the third conductivity sensor (5) and corresponding measurement temperatures.
6. The power station water vapor multi-parameter cooperative measurement method according to claim 5, wherein the calculation process of the conductivity value at 25 ℃ is as follows:
1 aa) calculating the temperature compensation coefficient under the condition of preset water quality
Comprises the following steps:
ɑ＝V+(A*X)+B*Y)+C*XY)+(D*X 2 )+(E*Y 2 )+(F*X 2 Y)+(G*XY 2 )+(H*X 3 )+(I*Y 3 )+(J*X 3 Y)+(K*X 2 Y 2 )+L*XY 3 )+(M*X 4 )+(N*Y 4 ) (1)
wherein X is temperature, Y is measured conductivity, V is intercept of the nonlinear curve model, A, B, C, D, E, F, G, H, I, J, K, L, M and N are constants of the regression model;
2 aa) calculation of the conductivity value DD of the medium at 25 ℃ 25 Comprises the following steps:
DD 25 ＝Y/(ɑ*(X-25)+1) (2)。
7. the power station water vapor multi-parameter cooperative measurement method according to claim 5, wherein pure water mediumpH of biomass at 25 deg.C 25 Comprises the following steps:
pH 25 ＝C 0 +lg(SC 25 )
wherein, C 0 To intercept, to a specific constant, SC 25 Is specific conductivity value, SC, of pure water medium at 25 DEG C 25 And calculating according to the measured specific conductivity value, the temperature and the medium nonlinear temperature compensation curve.
8. The power station water vapor multi-parameter cooperative measurement method as claimed in claim 5, wherein the pH value of the ammoniacal pure water medium at 25 ℃ 25 Comprises the following steps:
pH 25 ＝C 0 +lg(SC 25 -a 1 CC 25 -a 2 CC 2 25 )
wherein, a 1 And a 2 Is a regression constant.
9. The power station water vapor multi-parameter cooperative measurement method according to claim 5, characterized in that the pH value of the weak sodium hydroxide medium at 25 ℃ is pH 25 Comprises the following steps:
pH 25 ＝C 0 +lg(SC 25 -a 1 CC 25 )
wherein, SC 25 Is the specific conductivity value of weak sodium hydroxide medium at 25 ℃; CC (challenge collapsar) 25 Is the hydrogen conductivity value of weak sodium hydroxide medium at 25 ℃.
10. The power station water vapor multiparameter cooperative measurement method according to claim 5, characterized in that the current signal of the electrically regenerating cation exchange device (2) is automatically adjusted according to the specific conductivity value, wherein the curve model of the change of the current of the electrically regenerating cation exchange device (2) with the specific conductivity value is:
I＝C 0 +a 1 SC 25 +a 2 SC 25 2 +a 3 SC 25 3
wherein, a 3 Is a regression constant.
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