CN110487850B - Degassing conductivity measurement system and method - Google Patents
Degassing conductivity measurement system and method Download PDFInfo
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- CN110487850B CN110487850B CN201910854953.7A CN201910854953A CN110487850B CN 110487850 B CN110487850 B CN 110487850B CN 201910854953 A CN201910854953 A CN 201910854953A CN 110487850 B CN110487850 B CN 110487850B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/06—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a liquid
- G01N27/07—Construction of measuring vessels; Electrodes therefor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/06—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a liquid
- G01N27/08—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a liquid which is flowing continuously
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Abstract
The invention discloses a degassing conductivity measurement system and a degassing conductivity measurement method.A bottle cap is arranged at the top opening of a sampling bottle, a filter element is arranged on the bottle cap, an outlet of the sampling bottle is communicated with an inlet of a first conductivity detector, an outlet water sample of the first conductivity detector is divided into two paths, one path of water sample and an outlet of an acid adding device are communicated with an inlet of a first path of channel of a degassing membrane after being connected through a pipeline, and an outlet of the first path of channel in the degassing membrane is communicated with a drain pipe; the other water sample is communicated with a water inlet of the electric desalting device, a water outlet of the electric desalting device is communicated with an inlet of a second channel of the degassing membrane, an outlet of the second channel of the degassing membrane is communicated with an inlet of a second conductivity detector, an outlet of the second conductivity detector is communicated with an inlet of an electrolytic water channel of the electric desalting device, and an outlet of the electrolytic water channel of the electric desalting device is communicated with a drainage pipeline.
Description
Technical Field
The invention relates to a degassing conductivity measurement system and a method, in particular to a pure water conductivity measurement system and a method.
Background
The conductivity is an important index for representing the purity of water (steam) in a power plant, but in practical application, carbon dioxide in air easily enters a measuring system to influence measurement, so that when the conductivity of pure water used in the electric power industry, the electronic industry and the pharmaceutical industry is measured, the conductivity of a water sample needs to be measured online to avoid the interference of the carbon dioxide.
Defects of the prior art: when measuring the conductivity of pure water, the interference of carbon dioxide is serious, on-line measurement is needed, and whether the conductivity meter for measurement is accurate or not needs to be compared with a meter with a higher level, so that the actual measurement of the conductivity of the pure water is not a traceable metering device and method.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a degassing conductivity measurement system and a degassing conductivity measurement method, which can accurately realize off-line measurement of pure water conductivity and have strong carbon dioxide interference resistance.
In order to achieve the above purpose, the degassing conductivity measurement system of the invention comprises a sampling bottle, a filter element, a first conductivity detector, an acid adding device, a degassing membrane, a drain pipe, an electric desalting device, a second conductivity detector and a drain pipe;
the top opening of the sampling bottle is provided with a bottle cap, the bottle cap is provided with a filter element, the outlet of the sampling bottle is communicated with the inlet of the first conductivity detector, the water outlet of the first conductivity detector is divided into two paths, one path of water sample and the outlet of the acid adding device are communicated with the inlet of a first path of channel of the degassing membrane after being connected through a pipeline, and the outlet of the first path of channel of the degassing membrane is communicated with the drain pipe; the other water sample is communicated with a water inlet of the electric desalting device, a water outlet of the electric desalting device is communicated with an inlet of a second channel in the degassing membrane, an outlet of the second channel of the degassing membrane is communicated with a second conductivity detector, a water outlet of the second conductivity detector is communicated with an inlet of an electrolytic water channel of the electric desalting device, and an outlet of the electrolytic water channel of the electric desalting device is communicated with a drain pipe.
The degassing conductivity measurement method provided by the invention comprises the following steps of:
the water sample is taken and then put into a sampling bottle, air enters the bottle through a filter element, carbon dioxide is removed, the conductivity of the water sample in the sampling bottle is kept constant in the measurement process, the water sample output by the sampling bottle is divided into two paths after being measured by a first conductivity detector, one path of water sample is subjected to pH value adjustment through acid output by an acid adding device, then is discharged into a drain pipe after passing through a first path of passage in a degassing membrane, the other path of water sample is subjected to anion and cation removal by an electric desalting device and then enters a second path of passage in the degassing membrane, and the effluent of the second path of passage in the degassing membrane is subjected to water electrolysis by an electrolytic water channel of the electric desalting device after the conductivity of the water sample is detected by the second conductivity detector, so that H generated by the electrolytic water is generated + And OH (OH) - The resin in the ion pair electric desalting device is regenerated in real time, and the electrolyzed water sample is discharged into a drain pipe.
The conductivity of the water sample is detected by the first conductivity detector, the conductivity of the pure water after passing through the degassing membrane is measured by the second conductivity detector, the conductivity detected by the second conductivity detector is compared with the conductivity of the pure water, the carbon dioxide content in the original water sample is calculated by combining the flow velocity condition, and the influence of the carbon dioxide is removed from the conductivity value of the water sample measured by the first conductivity detector, so that the degassing conductivity value of the water sample is obtained.
The invention has the following beneficial effects:
when the degassing conductivity measurement system and method are specifically operated, the conductivity detected by the second conductivity detector is compared with the conductivity of pure water, the carbon dioxide content in the original water sample is calculated by combining the flow velocity condition, the influence of carbon dioxide is removed from the conductivity value measured by the first conductivity detector, and the degassing conductivity value of the water sample is obtained, so that the offline accurate measurement of the conductivity of the pure water sample is realized, the degassing conductivity measurement system and method can be used for offline measurement of the degassing conductivity of the pure water sample in the electric power, electronic and pharmaceutical industries, and a traceable metering device and method for measuring the conductivity of the pure water are provided, so that the system and method are energy-saving, environment-friendly, stable in performance and convenient to operate.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the present invention;
FIG. 2 is a graph showing the effect of pH on the total carbonic acid concentration distribution.
Wherein, 1 is the sample bottle, 2 is the filter core, 3 is first conductivity detector, 4 is the acidification device, 5 is the air release membrane, 6 is electric desalination device, 7 is second conductivity detector, 8 is the drain pipe.
Detailed Description
The invention is described in further detail below with reference to the attached drawing figures:
referring to fig. 1, the system and method for measuring degassing conductivity of the present invention comprise a sampling bottle 1, a filter element 2, a first conductivity detector 3, an acid adding device 4, a degassing membrane 5, a drain pipe 8, an electric desalting device 6, a second conductivity detector 7 and a drain pipe (8. The top opening of the sampling bottle 1 is provided with a bottle cap, the filter element 2 is arranged on the bottle cap, the outlet of the sampling bottle 1 is communicated with the inlet of the first conductivity detector 3, the outlet of the first conductivity detector 3 is divided into two paths, one water sample is communicated with the inlet of the first path of the degassing membrane 5 after passing through the pipeline and the outlet of the acid adding device 4, the outlet of the first path of the degassing membrane 5 is communicated with the drain pipe 8, the other water sample is communicated with the water inlet of the electric desalting device 6, the water outlet of the electric desalting device 6 is communicated with the inlet of the second path of the degassing membrane 5, the outlet of the second path of the second conductivity detector 7 is communicated with the inlet of the electric desalting device 6, and the outlet of the electric desalting device 8 is communicated with the outlet of the electric desalting device.
The degassing conductivity measurement method provided by the invention comprises the following steps of:
the water sample is taken and then is put into a sampling bottle 1, carbon dioxide in the air is removed after passing through a filter element 2, so that the conductivity of the 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 after being measured by a first conductivity detector 3, one path of water sample is subjected to pH value adjustment by acid output by an acid adding device 4, and then is discharged into a drain pipe 8 after passing through a first path of channel in a degassing membrane 5; the other water sample enters a second path of channel in the degassing membrane 5 after anions and cations in the water sample are removed by the electric desalting device 6, the effluent of the second path of channel of the degassing membrane 5 enters an electrolysis channel of the electric desalting device 6 for water electrolysis after the conductivity of the water sample is detected by a second conductivity detector 7, and H generated by the electrolysis of water + And OH (OH) - The resin in the ion pair electric desalting device 6 is regenerated in real time, and the water sample discharged from the electrolysis passage is discharged into a drain pipe 8; the degassing membrane 5 is a decarbonation membrane.
The principle of deducting the influence of pure water carbon dioxide in the invention is as follows: in the process, the pH value of the water sample after acid addition is regulated to be below 3, various forms of carbonate in the water sample are converted into carbon dioxide to enter another path of pure water through the degassing membrane, referring to figure 2, the conductivity of the pure water after the pure water passes through the degassing membrane 5 is measured through a second conductivity detector 7, the conductivity is compared with the conductivity of the pure water, the flow rate condition is combined, the content of dissolved carbon dioxide in the original water sample can be calculated, and the influence of the carbon dioxide is subtracted from the conductivity value measured by the first conductivity detector 3, so that the degassing conductivity of the water sample is obtained.
The electric desalting device 6 generates H by electrolyzing water with constant current + And OH (OH) - The ion continuously regenerates the resin in the electric desalting device 6 without acid-base regeneration.
The invention can be used for off-line measurement of the conductivity of purer water samples used in the electric power, electronic and pharmaceutical industries, and simultaneously provides a traceable metering device and method for measuring the conductivity of low-conductivity water samples, and has the advantages of energy conservation, environmental protection, stable performance and convenient operation.
Compared with the conventional pure water conductivity detection method, the method has the following technical characteristics:
1) The carbon dioxide interference is serious in the conventional pure water conductivity measurement, and the method can effectively avoid the carbon dioxide interference.
2) The conventional pure water conductivity can only be measured on line to obtain accurate measurement results, and the invention can deduct the interference of carbon dioxide to carry out off-line measurement.
3) The invention provides a traceable metering device and method for measuring the conductivity of the pure water, which are energy-saving, environment-friendly and stable in performance.
4) The whole measuring system has simple and small volume and convenient operation, and can accurately reflect the content of impurities in water.
Claims (2)
1. The degassing conductivity measurement system is characterized by comprising a sampling bottle (1), a filter element (2), a first conductivity detector (3), an acid adding device (4), a degassing membrane (5), a drain pipe (8), an electric desalting device (6), a second conductivity detector (7) and a drain pipe (8);
the top opening of the sampling bottle (1) is provided with a bottle cap, the bottle cap is provided with a filter element (2), the outlet of the sampling bottle (1) is communicated with the inlet of a first conductivity detector (3), the outlet water of the first conductivity detector (3) is divided into two paths, one path of water is communicated with the inlet of a first path of channel of a degassing membrane (5) after passing through a pipeline and being connected with a pipe, and the outlet of the first path of channel of the degassing membrane (5) is communicated with a drain pipe (8); the other water sample is communicated with a water inlet of the electric desalting device (6), a water outlet of the electric desalting device (6) is communicated with an inlet of a second channel in the degassing membrane (5), an outlet of the second channel in the degassing membrane (5) is communicated with an inlet of a second conductivity detector (7), a water outlet of the second conductivity detector (7) is communicated with an inlet of an electrolytic water channel of the electric desalting device (6), and an outlet of an electrolytic water channel of the electric desalting device (6) is communicated with a drain pipe (8);
the two paths of water samples reversely pass through the degassing membrane (5).
2. A method of measuring degassed conductivity comprising the steps of:
the water sample is taken and then put into a sampling bottle (1), carbon dioxide in the water sample is removed after the air passes through a filter element (2), so that the conductivity of the water sample in the sampling bottle (1) is kept constant in the measurement process, the water sample output by the sampling bottle (1) is divided into two paths after being measured by a first conductivity detector (3), one path of the water sample is subjected to pH value adjustment by acid output by an acid adding device (4), then is discharged into a drain pipe (8) after passing through a first path of channel in a degassing membrane (5), the other path of water sample is subjected to anion and cation removal by an electric desalting device (6) and then enters a second path of channel in the degassing membrane (5), and the water outlet of the second path of channel in the degassing membrane (5) is subjected to electrolysis by entering an electrolytic water path of an electric desalting device (6) after the conductivity of the water sample is detected by a second conductivity detector (7), wherein H generated by electrolytic water is generated + And OH (OH) - Regenerating resin in the ion pair electric desalting device (6), and discharging an electrolyzed water sample into a drain pipe (8);
the two paths of water samples reversely pass through the degassing membrane (5) at different flow rates, carbon dioxide exchange is carried out in the degassing membrane, the conductivity of pure water after passing through the degassing membrane (5) is measured through the second conductivity detector (7) and compared with the conductivity of pure water, the carbon dioxide content in the original water sample is calculated by combining the flow rate condition, and the influence of carbon dioxide is removed from the conductivity value measured by the first conductivity detector (3), so that the degassing conductivity value of the water sample is obtained.
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| 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 |
| 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 |
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