CN113533447A - System and method for measuring conductivity of degassed hydrogen in water vapor system of power plant - Google Patents
System and method for measuring conductivity of degassed hydrogen in water vapor system of power plant Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 122
- 239000001257 hydrogen Substances 0.000 title claims abstract description 50
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 50
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims description 20
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 120
- 239000007789 gas Substances 0.000 claims abstract description 76
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 59
- 239000011347 resin Substances 0.000 claims abstract description 42
- 229920005989 resin Polymers 0.000 claims abstract description 42
- 238000007872 degassing Methods 0.000 claims abstract description 34
- 238000005259 measurement Methods 0.000 claims abstract description 32
- 238000000691 measurement method Methods 0.000 claims abstract description 5
- 150000001768 cations Chemical class 0.000 claims description 46
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 35
- 239000007788 liquid Substances 0.000 claims description 31
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 17
- 239000001569 carbon dioxide Substances 0.000 claims description 17
- 238000005342 ion exchange Methods 0.000 claims description 8
- 229910001220 stainless steel Inorganic materials 0.000 claims description 7
- 239000010935 stainless steel Substances 0.000 claims description 7
- 238000010924 continuous production Methods 0.000 claims description 6
- 239000011521 glass Substances 0.000 claims description 5
- 230000002035 prolonged effect Effects 0.000 claims description 5
- 230000008929 regeneration Effects 0.000 claims description 5
- 238000011069 regeneration method Methods 0.000 claims description 5
- -1 ammonium ions Chemical class 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 4
- 239000003112 inhibitor Substances 0.000 claims description 4
- 238000010926 purge Methods 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 4
- 230000002378 acidificating effect Effects 0.000 claims description 3
- 238000001179 sorption measurement Methods 0.000 claims description 3
- 150000002431 hydrogen Chemical class 0.000 claims description 2
- 238000012544 monitoring process Methods 0.000 abstract description 9
- 238000001816 cooling Methods 0.000 description 11
- 238000009835 boiling Methods 0.000 description 6
- 238000005261 decarburization Methods 0.000 description 4
- 238000009826 distribution Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- NWUYHJFMYQTDRP-UHFFFAOYSA-N 1,2-bis(ethenyl)benzene;1-ethenyl-2-ethylbenzene;styrene Chemical compound C=CC1=CC=CC=C1.CCC1=CC=CC=C1C=C.C=CC1=CC=CC=C1C=C NWUYHJFMYQTDRP-UHFFFAOYSA-N 0.000 description 2
- 239000003729 cation exchange resin Substances 0.000 description 2
- 238000005262 decarbonization Methods 0.000 description 2
- 229910001873 dinitrogen Inorganic materials 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 238000005341 cation exchange Methods 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 238000004587 chromatography analysis Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
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- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
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- 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
- G01N27/07—Construction of measuring vessels; Electrodes therefor
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- G—PHYSICS
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- 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
- G01N27/10—Investigation or analysis specially adapted for controlling or monitoring operations or for signalling
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Abstract
The invention relates to a degassed hydrogen conductivity measurement system and a degassed hydrogen conductivity measurement method for a water vapor system of a power plant, and belongs to the technical field of water quality monitoring of the power plant. The system comprises an online water sample flow control unit, a compressed air control unit, a positive suppressor, a positive resin column, a micro gas booster pump, a micro nitrogen generator, a degassing column, a conductivity meter and a flow cell, wherein the online water sample flow control unit, the positive suppressor and the positive resin column are sequentially connected, the compressed air control unit, the micro gas booster pump and the micro nitrogen generator are sequentially connected, the positive resin column and the micro nitrogen generator are both connected with the degassing column, and the degassing column and the conductivity meter are both connected with the flow cell. The flow control of compressed air and an online water sample is realized by adopting a flow meter and a needle valve, and high-purity nitrogen is continuously generated by adopting a micro gas booster pump and a micro nitrogen generator.
Description
Technical Field
The invention relates to a degassed hydrogen conductivity measurement system and a degassed hydrogen conductivity measurement method for a water vapor system of a power plant, and belongs to the technical field of water quality monitoring of the power plant.
Background
The quality of a water vapor system is important for the safe operation of the generator set, wherein the hydrogen conductivity is a key index for showing the quality of water vapor. However, for the air cooling unit or the wet cooling unit without the fine treatment system, carbon dioxide is inevitably contained in the water vapor system due to leakage of the air cooling island or carrying of make-up water. The carbon dioxide is combined with the alkalizer in the water vapor system, so that the water wall and the like cannot be corroded, and the influence of the carbon dioxide on the water vapor system can be ignored. However, when the hydrogen conductivity of the water vapor system is measured, the reaction product of the carbon dioxide and the alkalizer is converted into carbonic acid after passing through the cation resin column, which can contribute to part of the hydrogen conductivity, so that the hydrogen conductivity cannot reflect the real content of harmful ions (such as chloride ions) in the water vapor, and the monitoring of the water vapor quality is influenced.
At present, the power generation unit has strict requirements on hydrogen conductivity of condensed water, feed water and the like, wherein the feed water of the supercritical unit is required to be less than 0.10 mu S/cm, so even if the feed water only contains 10 mu g/L of carbon dioxide, the hydrogen conductivity of the feed water also exceeds the standard. For an air cooling unit and a wet cooling unit without a fine treatment system, the situation that the water-hydrogen conductivity exceeds the standard often occurs due to the existence of carbon dioxide; in order to find out the reason of exceeding standard, the interference of carbon dioxide is frequently checked by sampling ion chromatographic analysis, and the normal operation monitoring of a power plant is greatly influenced.
In view of the influence of carbon dioxide on water vapor quality monitoring, electric power industry standards have recommended that air cooling units and wet cooling units without a fine processing system adopt degassed hydrogen conductivity instead of hydrogen conductivity as a water vapor quality monitoring index, but domestic power plants are rarely provided with degassed hydrogen conductivity measuring devices, wherein the great reason is that the purchase cost is high.
The existing degassed hydrogen conductivity measuring device in the current market mostly adopts a boiling method to decarbonize, a 220V power supply and a heating coil are used for heating an online water sample to boiling, and a high-temperature water sample after decarbonization needs low-temperature water to be cooled. However, when the device is used, the heating temperature control module is frequently in fault, the cooling effect of the high-temperature water sample is poor, the outlet water temperature is about 45 ℃ basically, the requirement of 25 +/-2 ℃ in the standard is seriously exceeded, and the accurate measurement of the electrical conductivity of the degassed hydrogen is not facilitated. In order to solve the problem of monitoring the water vapor quality, a more optimized scheme for realizing online monitoring of the electrical conductivity of the degassed hydrogen is urgently needed.
In view of this, patent document No. 201520410124.7 discloses a degassed hydrogen conductivity measurement device, but the measurement result is inaccurate and the application range is small.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a measuring system and a measuring method for the degassed hydrogen conductivity of a water vapor system of a power plant, which have reasonable structural design, can realize on-line monitoring of the degassed hydrogen conductivity and realize efficient decarburization without adopting a boiling method.
The technical scheme adopted by the invention for solving the problems is as follows: this power plant steam system degasification hydrogen conductivity measurement system, its structural feature lies in: the system comprises an online water sample flow control unit, a compressed air control unit, a positive suppressor, a positive resin column, a miniature gas booster pump, a miniature nitrogen generator, a degassing column, a conductivity meter and a flow cell, wherein the online water sample flow control unit, the positive suppressor and the positive resin column are sequentially connected, the compressed air control unit, the miniature gas booster pump and the miniature nitrogen generator are sequentially connected, the positive resin column and the miniature nitrogen generator are both connected with the degassing column, and the degassing column and the conductivity meter are both connected with the flow cell;
the online water sample flow control unit comprises a liquid flow needle valve, a liquid flow meter and an exhaust valve, the liquid flow needle valve, the liquid flow meter and the exhaust valve are sequentially connected, and the exhaust valve is connected with the positive suppressor; the compressed air control unit comprises a gas flow needle valve, a gas flow meter and an air filter, the gas flow needle valve, the gas flow meter and the air filter are connected in sequence, and the air filter is connected with the micro gas booster pump.
Further, the liquid flow needle valve is a stainless steel needle valve, the liquid flowmeter is an electromagnetic flowmeter, and the exhaust valve is an automatic exhaust valve; when the water contains bubbles, the valve core in the exhaust valve automatically descends, the gas is exhausted, and then the valve core of the exhaust valve floats upwards under the water power to realize sealing.
Furthermore, the gas flow needle valve is a stainless steel needle valve, the gas flow meter is a high-pressure trace gas flowmeter, and the air filter is a high-precision filter containing a pleated filter element.
Furthermore, the continuous production of high-purity nitrogen gas is realized by adopting a micro gas booster pump and a micro nitrogen making machine, the micro nitrogen making machine is a gas drive gas booster pump, takes compressed air as a power source and has high booster ratio, and the micro nitrogen making machine is a pressure swing adsorption PSA nitrogen making machine, so that the volume is small, and the purity of the generated nitrogen gas is high.
Further, cation removal pretreatment and deep ion exchange treatment are sequentially carried out on a water sample by adopting a cation suppressor and an cation resin column, wherein the cation suppressor is an electric regeneration suppressor based on layered EDI, the cation resin column is a color-changing cation resin column, the removal efficiency of the cation suppressor on ammonium ions in a water vapor system is more than 95%, and the operation cycle of the conventional cation resin column can be prolonged from 2 weeks to about 40 weeks.
Further, decarbonizing by adopting a gas purging method, wherein the used nitrogen is derived from the filtered and separated compressed air, and the used degassing column is an organic glass column filled with degassing polyhedral hollow spheres; and nitrogen enters from the bottom of the degassing column and is decarburized in the polyhedral hollow sphere together with the water sample.
Furthermore, the conductivity meter is a high-performance conductivity meter, the degassed hydrogen conductivity measurement adopts the high-performance conductivity meter, the electrode constant is required to be 0.01cm-1 or 0.04cm-1, an acidic temperature compensation mode is required, and the selected instrument is ensured to be suitable for the measurement requirement of special water quality of a water vapor system.
Further, another technical object of the present invention is to provide a measuring method of a degassed hydrogen conductivity measuring system of a water vapor system of a power plant.
The technical purpose of the invention is realized by the following technical scheme.
A measuring method of a degassed hydrogen conductivity measuring system of a water vapor system of a power plant is characterized in that: the measurement method is as follows:
an online water sample flow control unit is formed by adopting a liquid flow needle valve, a liquid flow meter and an exhaust valve, so that automatic removal of bubbles in an online water sample can be realized;
a compressed air control unit is formed by adopting a gas flow needle valve, a gas flowmeter and an air filter, so that moisture, impurities and the like in compressed air can be removed, and the purity of the compressed air is ensured;
the micro gas booster pump and the micro nitrogen making machine are adopted to realize the continuous production of high-purity nitrogen, and the purity of the nitrogen is more than 99.99 percent;
by adopting a cation suppressor, a cation resin column and a degassing column as means, cation removal pretreatment, deep ion exchange and carbon dioxide removal are carried out on a water sample in sequence, the carbon dioxide removal efficiency is ensured, the long running period is realized, and the resin does not need to be frequently replaced.
Compared with the prior art, the invention has the following advantages: the flow control of compressed air and an online water sample is realized by adopting a flow meter and a needle valve, and high-purity nitrogen is continuously generated by adopting a micro gas booster pump and a micro nitrogen generator.
By adopting a cation suppressor, a cation resin column and a degassing column as means, cation removal pretreatment, deep ion exchange and carbon dioxide removal are carried out on a water sample in sequence, and finally the degassed hydrogen conductivity of the water sample is measured; compared with the existing method, the method does not adopt a boiling method for decarbonization, does not need to heat and cool the water sample, is more convenient and safer to use, and has more guaranteed measurement accuracy.
The cation suppressor and the cation resin column are adopted for cation removal, and the operation cycle of the cation resin is greatly prolonged by the cation suppressor; compressed air is used as a gas source of the nitrogen making machine and a power source of the micro gas booster pump, and the long-term stable operation of the high-purity nitrogen preparation unit can be ensured because the compressed air in the power plant is sufficient; the whole measuring device has no external power supply, does not need to frequently replace resin and is close to maintenance-free.
The method adopts high-purity nitrogen to enter the gas distribution pipe from the bottom of the degassing column and then enter the polyhedral hollow sphere for redistribution; in the polyhedral hollow sphere, a water sample can also disperse and flow downwards; in the process, carbon dioxide in a water sample diffuses into high-purity nitrogen, and the removal rate of the carbon dioxide in the equilibrium is close to 100% according to Henry's law.
The water sample is not required to be heated or cooled, so that the measurement is more accurate; the method adopts a high-purity nitrogen purging method for decarburization, is different from the decarburization method adopting a boiling method, does not need to heat a water sample to a boiling point and then cool the water sample, has the water sample temperature of about 25 ℃ at the outlet temperature of a constant-temperature cooling device, is in the best measurement temperature range of a conductivity meter, and has higher measurement accuracy.
The application range is wide, and the device can be used for coal-fired generator sets, gas generator sets, distributed energy sources and the like.
Drawings
Fig. 1 is a schematic connection diagram of a degassed hydrogen conductivity measurement system of a water vapor system of a power plant according to an embodiment of the invention.
In the figure: a liquid flow needle valve 1, a gas flow needle valve 2, a liquid flow meter 3, a gas flow meter 4, an exhaust valve 5, a positive suppressor 6, an air filter 7, a positive resin column 8, a micro gas booster pump 9, a micro nitrogen generator 10, a degassing column 11, an electric conductivity meter 12 and a flow cell 13.
Detailed Description
The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not to be construed as limiting the present invention.
Examples
Referring to fig. 1, it should be understood that the structures, ratios, sizes, and the like shown in the drawings are only used for understanding and reading the disclosure, and are not used for limiting the conditions that the present invention can be implemented, so they have no technical essence, and any structural modifications, ratio changes or size adjustments should fall within the scope of the present invention without affecting the function and the achievable purpose of the present invention. In the present specification, the terms "upper", "lower", "left", "right", "middle" and "one" are used for clarity of description, and are not used to limit the scope of the present invention, and the relative relationship between the terms and the relative positions may be changed or adjusted without substantial technical changes.
The degassed hydrogen conductivity measurement system of the water vapor system of the power plant in the embodiment comprises an online water sample flow control unit, a compressed air control unit, a positive inhibitor 6, a positive resin column 8, a micro gas booster pump 9, a micro nitrogen generator 10, a degassing column 11, a conductivity meter 12 and a flow cell 13, wherein the online water sample flow control unit, the positive inhibitor 6 and the positive resin column 8 are sequentially connected, the compressed air control unit, the micro gas booster pump 9 and the micro nitrogen generator 10 are sequentially connected, the positive resin column 8 and the micro nitrogen generator 10 are both connected with the degassing column 11, and the degassing column 11 and the conductivity meter 12 are both connected with the flow cell 13.
The online water sample flow control unit comprises a liquid flow needle valve 1, a liquid flow meter 3 and an exhaust valve 5, wherein the liquid flow needle valve 1, the liquid flow meter 3 and the exhaust valve 5 are sequentially connected, and the exhaust valve 5 is connected with a positive suppressor 6; the compressed air control unit comprises a gas flow needle valve 2, a gas flow meter 4 and an air filter 7, the gas flow needle valve 2, the gas flow meter 4 and the air filter 7 are sequentially connected, and the air filter 7 is connected with a micro gas booster pump 9.
The liquid flow needle valve 1 is a stainless steel needle valve, the liquid flow meter 3 is an electromagnetic flow meter, and the exhaust valve 5 is an automatic exhaust valve; when the water contains bubbles, the valve core in the exhaust valve 5 automatically descends, the gas is exhausted, and then the valve core of the exhaust valve 5 floats upwards under the water power to realize sealing.
The gas flow needle valve 2 is a stainless steel needle valve, the gas flowmeter 4 is a high-pressure micro gas flowmeter, and the air filter 7 is a high-precision filter with a pleated filter element.
The micro gas booster pump 9 and the micro nitrogen generator 10 are adopted to realize the continuous production of high-purity nitrogen, the micro nitrogen generator 10 is a gas-driven gas booster pump, compressed air is used as a power source, the booster ratio is high, the micro nitrogen generator 10 is a pressure swing adsorption PSA nitrogen generator, the size is small, and the purity of the generated nitrogen is high.
Cation removal pretreatment and deep ion exchange treatment are sequentially carried out on a water sample by adopting a cation suppressor 6 and an cation resin column 8, wherein the cation suppressor 6 is an electric regeneration suppressor based on layered EDI, the cation resin column 8 is a color-changing cation resin column, the removal efficiency of the cation suppressor 6 on ammonium ions in a water vapor system is over 95 percent, and the operation cycle of the conventional cation resin column can be prolonged from 2 weeks to about 40 weeks.
Decarbonizing by gas purging, wherein the nitrogen is derived from the filtered and separated compressed air, and the degassing column 11 is an organic glass column filled with degassing polyhedral hollow spheres; nitrogen enters from the bottom of the degassing column 11 and is decarburized in the polyhedral hollow sphere together with a water sample.
The conductivity meter 12 is a high-performance conductivity meter, the high-performance conductivity meter 12 is adopted for measuring the conductivity of the degassed hydrogen, the electrode constant is required to be 0.01cm-1 or 0.04cm-1, an acidic temperature compensation mode is required, and the selected meter is ensured to be suitable for the measurement requirement of special water quality of a water vapor system.
The measuring method of the degassed hydrogen conductivity measuring system of the water vapor system of the power plant comprises the following steps:
the liquid flow needle valve 1, the liquid flow meter 3 and the exhaust valve 5 form an online water sample flow control unit, so that bubbles in an online water sample can be automatically removed, and the safe operation of subsequent equipment is ensured.
Adopt gas flow needle valve 2, gas flowmeter 4 and air cleaner 7 to constitute compressed air control unit, can get rid of moisture and impurity etc. in the compressed air, ensure compressed air purity, can not pollute online water sample.
The micro gas booster pump 9 and the micro nitrogen generator 10 are adopted to realize the continuous production of high-purity nitrogen, and the purity of the nitrogen is more than 99.99 percent.
By adopting the cation suppressor 6, the cation resin column 8 and the degassing column 11 as means, cation removal pretreatment, deep ion exchange and carbon dioxide removal are carried out on a water sample in sequence, the carbon dioxide removal efficiency is ensured, the operation period is long, and the resin does not need to be replaced frequently.
Specifically, the measuring object of the degassed hydrogen conductivity measuring system of the water vapor system of the power plant is generally condensed water, feed water or steam, a water sample is taken from the outlet of the constant-temperature cooling device of the water vapor sampling frame, and the temperature of the water sample is generally 25 +/-2 ℃; the outlet of the exhaust valve is empty, and the escaped water sample is collected to the trench; after measurement, the water sample is led into a centralized drainage pipe by a pipeline.
Specifically, the degassed hydrogen conductivity measuring system of the water vapor system of the power plant comprises a liquid flow needle valve 1, a gas flow needle valve 2, a liquid flow meter 3, a gas flow meter 4, an exhaust valve 5, a positive suppressor 6, an air filter 7, a positive resin column 8, a micro gas booster pump 9, a micro nitrogen generator 10, a degassing column 11, a conductivity meter 12, a flow cell 13, and pipelines and valves which are connected with one another.
Specifically, in the degassed hydrogen conductivity measurement system of the water vapor system of the power plant, a liquid flow needle valve 1 is connected with a constant temperature cooling device through a stainless steel sampling tube for water sample treatment, a water sample adjusted by the liquid flow needle valve 1 enters a liquid flow meter 3 and an exhaust valve 5, and the flow rate of the water sample is maintained at about 200 ml/min; the exhaust valve 5 is an automatic exhaust valve, when the incoming water contains bubbles, a valve core in the exhaust valve 5 automatically descends, gas is exhausted, and then the valve core floats upwards under the water power to realize sealing.
Specifically, in the degassed hydrogen conductivity measurement system of the water vapor system of the power plant, the cation suppressor 6 is an electric regeneration exchanger based on the split-bed EDI technology; the two ends of the exchanger are provided with graphite electrodes, a cation exchange membrane is arranged in the exchanger, and cation exchange resin is filled between the two membranes; when the equipment normally operates, the ion exchange and the regeneration are simultaneously carried out, the removal rate of the cation suppressor 6 to the ammonium ions in the water sample is more than 95 percent, and the operation period of the common cation resin column can be prolonged by more than 20 times.
Specifically, in the degassed hydrogen conductivity measurement system of the water vapor system of the power plant, the cation resin column 8 is an organic glass column, the inner diameter of the exchange column is 45mm, and the height is 50 cm; the inside is filled with color-changing cation exchange resin, and the resin changes from purple to yellow when the resin fails; the exchange column has the operation mode of water inlet and water outlet, and the resin does not mix with the layer.
Specifically, in the degassed hydrogen conductivity measurement system of the water vapor system of the power plant, the degassing column 11 is an organic glass column, the inner diameter of the exchange column is 60mm, and the height is 60 cm; the upper part is provided with a water distribution device, and the bottom is provided with an air distribution device; degassing polyhedral hollow spheres are filled in the degassing column, and the diameter of each hollow sphere is 5 mm; the degassing column 11 operates in a mode that water enters from the upper part and enters the lower part, gas escapes from the top exhaust port after exchange, a water sample enters from the top and enters the flow cell 13 through the overflow weir at the lower part to measure the electrical conductivity of degassed hydrogen.
Specifically, in the degassed hydrogen conductivity measurement system of the water vapor system of the power plant, compressed air is derived from compressed air for a power plant instrument, and the pressure is 0.4 MPa-0.6 MPa; the flow rate of the compressed air is adjusted by a gas flow needle valve 2, and a gas flowmeter 4 is a high-pressure trace gas flowmeter.
Specifically, the compressed air is filtered and purified by an air filter 7 to remove impurities such as moisture and oil in the air; the purified compressed air enters a micro gas booster pump 9 for boosting, so that the pressure of the outlet gas is more than 1.0 MPa.
Specifically, the compressed air after being pressurized enters a micro nitrogen generator 10, and is subjected to gas separation and purification to generate high-purity nitrogen, wherein the purity of the nitrogen is over 99.9 percent, and the flow rate of the nitrogen is about 50L/h; the generated high-purity nitrogen enters a degassing column 11 to be mixed with a water sample for mass transfer, and the decarburization process is completed.
Specifically, the decarburized water sample enters a flow cell 13 for degassed hydrogen conductivity measurement, the electrode constant of the conductivity meter 12 is 0.01cm < -1 > or 0.04cm < -1 > grade, an acid temperature compensation mode is provided, and the hydrogen conductivity measurement requirement is met.
In addition, it should be noted that the specific embodiments described in the present specification may be different in the components, the shapes of the components, the names of the components, and the like, and the above description is only an illustration of the structure of the present invention. Equivalent or simple changes in the structure, characteristics and principles of the invention are included in the protection scope of the patent. Various modifications, additions and substitutions for the specific embodiments described may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.
Claims (8)
1. The utility model provides a power plant steam system degassed hydrogen conductivity measurement system which characterized in that: the device comprises an online water sample flow control unit, a compressed air control unit, a positive inhibitor (6), a positive resin column (8), a micro gas booster pump (9), a micro nitrogen generator (10), a degassing column (11), a conductivity meter (12) and a flow cell (13), wherein the online water sample flow control unit, the positive inhibitor (6) and the positive resin column (8) are sequentially connected, the compressed air control unit, the micro gas booster pump (9) and the micro nitrogen generator (10) are sequentially connected, the positive resin column (8) and the micro nitrogen generator (10) are both connected with the degassing column (11), and the degassing column (11) and the conductivity meter (12) are both connected with the flow cell (13);
the online water sample flow control unit comprises a liquid flow needle valve (1), a liquid flow meter (3) and an exhaust valve (5), the liquid flow needle valve (1), the liquid flow meter (3) and the exhaust valve (5) are sequentially connected, and the exhaust valve (5) is connected with a positive suppressor (6); the compressed air control unit comprises a gas flow needle valve (2), a gas flow meter (4) and an air filter (7), the gas flow needle valve (2), the gas flow meter (4) and the air filter (7) are sequentially connected, and the air filter (7) is connected with a micro gas booster pump (9).
2. The power plant water vapor system degassed hydrogen conductivity measurement system of claim 1, wherein: the liquid flow needle valve (1) is a stainless steel needle valve, the liquid flow meter (3) is an electromagnetic flow meter, and the exhaust valve (5) is an automatic exhaust valve; when the water contains bubbles, the valve core in the exhaust valve (5) automatically descends, the gas is exhausted, and then the valve core of the exhaust valve (5) floats upwards under the water power to realize sealing.
3. The power plant water vapor system degassed hydrogen conductivity measurement system of claim 1, wherein: the gas flow needle valve (2) is a stainless steel needle valve, the gas flowmeter (4) is a high-pressure trace gas flowmeter, and the air filter (7) is a high-precision filter with a pleated filter element.
4. The power plant water vapor system degassed hydrogen conductivity measurement system of claim 1, wherein: the continuous production of high-purity nitrogen is realized by adopting the micro gas booster pump (9) and the micro nitrogen generator (10), the micro nitrogen generator (10) is a gas-driven gas booster pump, compressed air is used as a power source, the booster ratio is high, the micro nitrogen generator (10) is a pressure swing adsorption PSA nitrogen generator, the size is small, and the purity of the generated nitrogen is high.
5. The power plant water vapor system degassed hydrogen conductivity measurement system of claim 1, wherein: cation removal pretreatment and deep ion exchange treatment are sequentially carried out on a water sample by adopting a cation suppressor (6) and an cation resin column (8), wherein the cation suppressor (6) is an electric regeneration suppressor based on layered EDI, the cation resin column (8) is a color-changing cation resin column, the removal efficiency of the cation suppressor (6) on ammonium ions in a water vapor system is more than 95%, and the running period of the conventional cation resin column can be prolonged from 2 weeks to about 40 weeks.
6. The power plant water vapor system degassed hydrogen conductivity measurement system of claim 1, wherein: decarbonizing by adopting a gas purging method, wherein the used nitrogen is derived from the filtered and separated compressed air, and the degassing column (11) is an organic glass column filled with degassing polyhedral hollow spheres; the nitrogen enters from the bottom of the degassing column (11) and is decarburized in the polyhedral hollow sphere together with the water sample.
7. The power plant water vapor system degassed hydrogen conductivity measurement system of claim 1, wherein: the conductivity meter (12) is a high-performance conductivity meter, the high-performance conductivity meter (12) is adopted for measuring the conductivity of the degassed hydrogen, the electrode constant is required to be 0.01cm-1 or 0.04cm-1, an acidic temperature compensation mode is required, and the selected instrument is ensured to be suitable for the measurement requirement of special water quality of a water vapor system.
8. The measurement method of the degassed hydrogen conductivity measurement system of the water vapor system of the power plant is based on any one of claims 1 to 7, and is characterized in that: the measurement method is as follows:
an online water sample flow control unit is formed by adopting a liquid flow needle valve (1), a liquid flow meter (3) and an exhaust valve (5), so that automatic removal of bubbles in an online water sample can be realized;
a compressed air control unit is formed by adopting a gas flow needle valve (2), a gas flowmeter (4) and an air filter (7), so that moisture, impurities and the like in compressed air can be removed, and the purity of the compressed air is ensured;
the micro gas booster pump (9) and the micro nitrogen generator (10) are adopted to realize the continuous production of high-purity nitrogen, and the purity of the nitrogen is more than 99.99 percent;
by adopting the cation suppressor (6), the cation resin column (8) and the degassing column (11) as means, cation removal pretreatment, deep ion exchange and carbon dioxide removal are carried out on a water sample in sequence, the carbon dioxide removal efficiency is ensured, the operation period is long, and the resin does not need to be replaced frequently.
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