CN211179618U - Measuring system for electrical conductivity of degassed hydrogen - Google Patents
Measuring system for electrical conductivity of degassed hydrogen Download PDFInfo
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- CN211179618U CN211179618U CN201921507207.2U CN201921507207U CN211179618U CN 211179618 U CN211179618 U CN 211179618U CN 201921507207 U CN201921507207 U CN 201921507207U CN 211179618 U CN211179618 U CN 211179618U
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Abstract
The utility model discloses a measuring system for the electrical conductivity of degassed hydrogen.A water outlet of a sampling bottle is divided into two paths, wherein one path of water is communicated with an outlet of an acid adding device through a pipeline and then communicated with an inlet of a first path of channel in a degassing membrane, and an outlet of the first path of channel of the degassing membrane is communicated with a drainage pipeline; the other path is communicated with a water inlet of an electrically regenerated cation exchanger, a water outlet of the electrically regenerated cation exchanger is communicated with a water inlet of an electrically regenerated anion exchanger through a first conductivity detector, a water outlet of the electrically regenerated anion exchanger is communicated with an inlet of a second path of degassing membrane, an outlet of the second path of degassing membrane is communicated with an inlet of a second conductivity detector, an outlet of the second conductivity detector is communicated with electrolytic water channels of the electrically regenerated cation exchanger and the electrically regenerated anion exchanger, and an outlet of the electrolytic water channel of the electrically regenerated anion exchanger is communicated with a drainage pipeline.
Description
Technical Field
The utility model relates to a measurement system, concretely relates to measurement system of degassed hydrogen conductivity.
Background
The hydrogen conductivity is an important index for representing the purity and the etching of water (steam) in a power plant, and means that cations in a tested water (steam) sample are removed (converted into H+) And then the conductivity of the material is monitored to obtain a conductivity value. During this process, both the ammonia and the amine which adjust the pH are removed, leaving the salt impurities which are converted to the acid form, the aggressive anions (Cl)-Etc.) is greatly improved.
However, in practice, carbon dioxide in the air is very likely to enter the measuring system to affect the measurement, so that the measurement of water degassing (CO) is required in many cases2) Hydrogen conductivity to more accurately reflect the aggressive anion content of the water. At present, the method used by the power plant for measuring the conductivity of the degassed hydrogen is to use a boiling method to degas (CO) after water passes through an ion exchange resin column2) The conductivity was then measured.
The defects of the prior art are as follows: before degassing, removing cations by using an ion exchange column, if the resin is not replaced in time, the numerical value of the conductivity of the degassed hydrogen deviates from the actual value; the replaced resin is not regenerated completely or washed clean, and trace impurity ions released can cause positive errors; cation exchange resins can release low molecular polymer impurities, increasing background conductivity, resulting in inaccurate degassed hydrogen conductivity measurements; at present, the boiling method is mostly used for degassing, equipment is complex, and the degassing effect is poor, so that the conductivity of the degassed hydrogen is not accurately measured; the temperature is required to be reduced when the conductivity is measured after degassing by a boiling method, and the measurement accuracy of the conductivity of the degassed hydrogen is influenced due to the difference of the temperature; only online measurement can be carried out, offline measurement cannot be carried out, and the measurement device is large in size; replacement of the resin when it fails is cumbersome and time consuming, resulting in measurements that cannot be taken continuously.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome above-mentioned prior art's shortcoming, provide a measurement system of degasification hydrogen conductivity, this system can accurate online or off-line survey power plant's steam degasification hydrogen conductivity.
In order to achieve the above object, the measuring system of degassed hydrogen conductivity of the present invention comprises a sampling bottle, a filter element, an electrically regenerated cation exchanger, an acid adding device, a degassing membrane, a drainage pipeline, a first conductivity detector, an electrically regenerated anion exchanger, and a second conductivity detector;
a bottle cap is arranged at the opening at the top of the sampling bottle, a filter element is arranged on the bottle cap, the water outlet of the sampling bottle is divided into two paths, wherein one path of water sample and the outlet of the acidification device are communicated with the inlet of the first path of degassing membrane after being connected in parallel through a pipeline, and the outlet of the first path of degassing membrane is communicated with a drainage pipeline; the other path of water sample is communicated with a water inlet of the electric regeneration cation exchanger, a water outlet of the electric regeneration cation exchanger is communicated with a water inlet of the electric regeneration anion exchanger through a first conductivity detector, a water outlet of the electric regeneration anion exchanger is communicated with an inlet of a second path of channel in the degassing membrane, an outlet of the second path of channel in the degassing membrane is communicated with an electrolyzed water passage inlet of the electric regeneration cation exchanger through a second conductivity detector, an electrolyzed water passage outlet of the electric regeneration cation exchanger is communicated with an electrolyzed water passage inlet of the electric regeneration anion exchanger, and an electrolyzed water passage outlet of the electric regeneration anion exchanger is communicated with a drainage pipeline.
Electric regeneration cation exchanger and electric regeneration anion exchanger electrolyze water to generate H through constant current+And OH-To realize the continuous regeneration of the resin in the electrically regenerated cation exchanger and the electrically regenerated anion exchanger; and the two paths of water samples reversely pass through the degassing membrane at different flow rates, carbon dioxide exchange is carried out in the degassing membrane, the conductivity measured by the second conductivity detector is compared with the conductivity of pure water, the carbon dioxide content of the original water sample is calculated by combining the flow rate conditions, and the influence of the carbon dioxide is deducted from the hydrogen conductivity value measured by the first conductivity detector to obtain the degassed hydrogen conductivity of the water sample.
The utility model discloses following beneficial effect has:
measurement system of degassed hydrogen conductivity when concrete operation, the conductivity of water sample through second conductivity detector measurement compares with the conductivity of pure water to combine the carbon dioxide content of velocity of flow condition calculation raw water sample, deduct the influence of carbon dioxide in the hydrogen conductivity value of first conductivity detector measurement, obtain the degassed hydrogen conductivity of water sample, can realize the purpose of online or off-line survey water sample degassed hydrogen conductivity, energy-concerving and environment-protective, stable performance, convenient operation.
Drawings
Fig. 1 is a schematic structural view of the present invention;
fig. 2 is a graph showing the influence of the pH value on the total carbonic acid concentration distribution in the present invention.
Wherein, 1 is a sampling bottle, 2 is a filter core, 3 is an acid adding device, 4 is a degassing membrane, 5 is an electrically regenerated cation exchanger, 6 is a first conductivity detector, 7 is an electrically regenerated anion exchanger, 8 is a second conductivity detector, and 9 is a drainage pipeline.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings:
referring to fig. 1, the measuring system for degassed hydrogen conductivity according to the present invention includes a sampling bottle 1, a filter element 2, an electrically regenerated cation exchanger 5, an acid adding device 3, a degassing membrane 4, a drainage pipeline 9, a first conductivity detector 6, an electrically regenerated anion exchanger 7, and a second conductivity detector 8; a bottle cap is arranged at the opening at the top of the sampling bottle 1, a filter element 2 is arranged on the bottle cap, the water outlet of the sampling bottle 1 is divided into two paths, one path is communicated with the inlet of a first path channel in the degassing membrane 4 after being connected with the outlet of the acidification device 3 through a pipeline, and the outlet of the first path channel in the degassing membrane 4 is communicated with a water drainage pipeline 9; the other path of water sample is communicated with a water inlet of an electric regeneration cation exchanger 5, a water outlet of the electric regeneration cation exchanger 5 is communicated with a water inlet of an electric regeneration anion exchanger 7 through a first conductivity detector 6, a water outlet of the electric regeneration anion exchanger 7 is communicated with an inlet of a second path of channel in a degassing membrane 4, an outlet of the second path of channel in the degassing membrane 4 is communicated with an electrolytic water passage inlet of the electric regeneration cation exchanger 5 through a second conductivity detector 8, an electrolytic water passage outlet of the electric regeneration cation exchanger 5 is communicated with an electrolytic water passage inlet of the electric regeneration anion exchanger 7, an electrolytic water passage outlet of the electric regeneration anion exchanger 7 is communicated with a drainage pipeline 9, and the degassing membrane 4 is a carbon dioxide removal membrane.
The utility model discloses a concrete working process does:
air enters the sampling bottle 1 after passing through the filter element 2, carbon dioxide in the air is thoroughly removed, so that the conductivity of a water sample in the sampling bottle 1 is kept constant in the measuring process, the water sample output by the sampling bottle 1 is divided into two paths, wherein one path of water sample is discharged after passing through a first path of channel of a degassing membrane 4 after the pH value of the water sample is adjusted by acid output by an acid adding device 3; the other path of water sample is subjected to cation removal in the water through an electrically regenerated cation exchanger 5, enters a first conductivity detector 6 to measure the hydrogen conductivity of the water sample, then enters an electrically regenerated anion exchanger 7 to remove anions, the water sample from which the anions and the cations are removed enters a second path of channel in a degassing membrane 4, then enters a second conductivity detector 8 to measure the water conductivity, and the water sample output by the second conductivity detector 8 sequentially enters an electrically regenerated cation exchangeElectrolytic water passage in the device 5 and the electrically regenerated anion exchanger 7, water electrolysis generates H+And OH-The resins in the electrically regenerated cation exchanger 5 and the electrically regenerated anion exchanger 7 are regenerated and then discharged into the water discharge pipeline 9.
The electrically regenerated cation exchanger 5 and the electrically regenerated anion exchanger 7 electrolyze water by constant current to generate H+And OH-Ions to achieve continuous regeneration of the resin in the electrically regenerated cation exchanger 5 and the electrically regenerated anion exchanger 7; the two paths of water samples reversely pass through the degassing membrane 4 at different flow rates, carbon dioxide exchange is carried out in the degassing membrane, the conductivity of the water sample measured by the second conductivity detector 8 is compared with the conductivity of pure water, the carbon dioxide content of the original water sample is calculated by combining the flow rate conditions, and the degassed hydrogen conductivity of the water sample is obtained by deducting the influence of carbon dioxide from the hydrogen conductivity value measured by the first conductivity detector 6.
The degassing process in the utility model is as follows: the two paths of water samples reversely flow through the degassing membrane 4 at different flow rates, the pH value of one path of water sample is adjusted to be below 3 in the process by adding acid, carbonate in various forms in the water sample is converted into carbon dioxide, referring to figure 2, the carbon dioxide enters the other path of pure water through the degassing membrane 4, the other path of pure water absorbs carbon dioxide in the degassing membrane 4 and then enters a second conductivity detector 8, the electrical conductivity of the water sample after passing through the degassing membrane 4 is measured by a second conductivity detector 8, which is compared with the electrical conductivity of pure water, and the content of carbon dioxide dissolved in the original water sample can be accurately calculated by combining with the flow velocity condition, the influence of the carbon dioxide is deducted from the hydrogen conductivity value measured by the first conductivity detector 8, can obtain the degassed hydrogen conductivity of the water sample, utilize the utility model discloses measure the in-process of degassed hydrogen conductivity, can accurately deduct the carbon dioxide more than 99% in the aquatic.
The utility model removes the positive and negative ions in the water sample through the electric regeneration cation exchanger 5 and the electric regeneration anion exchanger 7, and the micro cation exchange resin and the anion exchange resin filled in the positive and negative ions remove H by utilizing the constant current electrolyzed water+And OH-And performing real-time regeneration.
Power plantNH in water vapor4 +The highest content, the utility model uses NH4 +Experiments were carried out to examine the cation removal rate of the electrically regenerated cation exchanger 5, and the specific experimental data are shown in table 1.
TABLE 1
The electrically regenerated cation exchanger 5 can effectively remove cations in water vapor, and meanwhile, the cation exchange resin in the electrically regenerated cation exchanger is not dissolved out in the exchange process, so that the measurement result is more accurate and reliable, and the comparison of the measurement result with the measurement result of the anions in the effluent of the conventional hydrogen-electricity guide column is shown in table 2.
TABLE 2
As can be seen from table 2, the conventional cation exchange column used in the hydrogen conductivity measurement in the power plant is filled with a large amount of resin, and the effluent of pure water passing through the exchange column contains a small amount of formate, acetate and sulfate, which causes a certain deviation between the measurement result and the actual measurement value; the utility model discloses the little cation exchange resin of well electricity regeneration cation exchanger 5 centre dress, its play water is the same with the anion content of intaking, and the cation is whole to be converted into H at this process+No dissolved matter is detected in the effluent, which shows that the electrically regenerated cation exchanger 5 can effectively remove cations in water without bringing dissolved matter into the effluent.
The measurement process of the conventional measurement system is as follows: the water sample passes through a cation exchange column and is heated by a heating coil to remove CO in the water sample2(the removal rate can reach 80 percent generally), when a water sample is cooled to about 40 ℃, the electrical conductivity of the water sample measured by a conductivity detector is the electrical conductivity of the degassed hydrogen, wherein the resin in the cation exchange column needs to be regenerated frequently, and the electrical conductivity of the degassed hydrogen is onlyCan be measured on line.
The utility model discloses can accurately reflect aggressive anion content in steam, the test result is shown in table 3.
TABLE 3
Use the utility model discloses can online or off-line measurement degasification hydrogen conductivity, can see out from table 3 data, the measured value is identical basically with the theoretical conductivity value of mark liquid, the utility model discloses a measuring result can accurately reflect the erosion nature anion content in the steam.
The utility model discloses thoroughly changed measurement system and the flow path of conventional degasification hydrogen conductivity, the measuring result accuracy is higher, and can off-line measurement also can on-line measuring.
Compared with the conventional method for detecting the conductivity of degassed hydrogen, the utility model has the following technical characteristics:
1) the utility model removes CO without adopting a boiling heating method2Removing CO in water by using degassing membrane 4 at normal temperature2And the measurement is accurate, and deduction is carried out in the hydrogen conductivity measurement result, so that the energy is saved and the environment is protected.
2) The electrically regenerated cation exchanger 5 ensures effective removal of cations from the water under the measurement conditions without any leachables.
3) The electric regeneration cation exchanger 5 and the electric regeneration anion exchanger 7 continuously provide power supply for electrolyzing water to generate H by using a low-power constant current source+And OH-The resin is regenerated, and no acid-base waste liquid is generated.
4) The whole measuring system is simple and small in size, easy to install, capable of being used as an online meter and a portable meter for offline use, and capable of accurately reflecting the content of the erosive anions in water.
Claims (1)
1. A measuring system for the electrical conductivity of degassed hydrogen is characterized by comprising a sampling bottle (1), an electrically regenerated cation exchanger (5), an acid adding device (3), a degassing membrane (4), a drainage pipeline (9), a first conductivity detector (6), an electrically regenerated anion exchanger (7) and a second conductivity detector (8);
a bottle cap is arranged at the opening at the top of the sampling bottle (1), a filter element (2) is arranged on the bottle cap, the water outlet of the sampling bottle (1) is divided into two paths, wherein one path of water sample and the outlet of the acidification device (3) are communicated with the inlet of a first path of channel in the degassing membrane (4) after being combined by a pipeline, and the outlet of the first path of channel in the degassing membrane (4) is communicated with a water drainage pipeline (9); the other path of water sample is communicated with a water inlet of an electric regeneration cation exchanger (5), a water outlet of the electric regeneration cation exchanger (5) is connected with a water inlet of a first conductance detector (6), a water outlet of the first conductance detector (6) is communicated with a water inlet of an electric regeneration anion exchanger (7), a water outlet of the electric regeneration anion exchanger (7) is communicated with an inlet of a second path of channel in a degassing membrane (4), an outlet of the second path of channel in the degassing membrane (4) is communicated with an inlet of a second conductance detector (8), a water outlet of the second conductance detector (8) is communicated with an electrolytic water passage inlet of the electric regeneration cation exchanger (5), an electrolytic water passage outlet of the electric regeneration cation exchanger (5) is communicated with an electrolytic water passage inlet of the electric regeneration anion exchanger (7), and an electrolytic water passage outlet of the electric regeneration anion exchanger (7) is communicated with a drainage pipeline (9).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921507207.2U CN211179618U (en) | 2019-09-10 | 2019-09-10 | Measuring system for electrical conductivity of degassed hydrogen |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110487851A (en) * | 2019-09-10 | 2019-11-22 | 华能国际电力股份有限公司 | A kind of measuring system and method for the hydrogen conductivity that deaerates |
| CN110487849A (en) * | 2019-09-10 | 2019-11-22 | 华能国际电力股份有限公司 | A kind of multi-parameter water quality measuring system and method |
| CN110487851B (en) * | 2019-09-10 | 2024-06-21 | 华能国际电力股份有限公司 | Measurement system and method for conductivity of degassed hydrogen |
-
2019
- 2019-09-10 CN CN201921507207.2U patent/CN211179618U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110487851A (en) * | 2019-09-10 | 2019-11-22 | 华能国际电力股份有限公司 | A kind of measuring system and method for the hydrogen conductivity that deaerates |
| CN110487849A (en) * | 2019-09-10 | 2019-11-22 | 华能国际电力股份有限公司 | A kind of multi-parameter water quality measuring system and method |
| WO2021047298A1 (en) * | 2019-09-10 | 2021-03-18 | 西安热工研究院有限公司 | System and method for measuring conductivity of degassed hydrogen |
| CN110487851B (en) * | 2019-09-10 | 2024-06-21 | 华能国际电力股份有限公司 | Measurement system and method for conductivity of degassed hydrogen |
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