CN113680742A - Maintenance method for sodium meter in nuclear power station - Google Patents
Maintenance method for sodium meter in nuclear power station Download PDFInfo
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- CN113680742A CN113680742A CN202110939269.6A CN202110939269A CN113680742A CN 113680742 A CN113680742 A CN 113680742A CN 202110939269 A CN202110939269 A CN 202110939269A CN 113680742 A CN113680742 A CN 113680742A
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- sodium
- meter
- sample water
- nuclear power
- flushing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/02—Cleaning by the force of jets or sprays
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B13/00—Accessories or details of general applicability for machines or apparatus for cleaning
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/08—Cleaning involving contact with liquid the liquid having chemical or dissolving effect
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
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Abstract
The invention provides a maintenance method of a sodium meter in a nuclear power station, which comprises the steps of determining the sodium meter to be washed during the shutdown period of a nuclear power unit, and an inlet pipeline which is preset on the sodium meter and used for accessing washing sample water and an outlet pipeline used for discharging the washing sample water; the sample washing water is used for eliminating the interference of impurity ions and sodium ions in the sodium surface to be washed; an ion exchange mechanism for eliminating the interference of hydrogen ions in the flushing sample water is arranged in the middle of the inlet pipeline; and additionally arranging an extension pipeline on the external opening end of the inlet pipeline, continuously introducing flushing sample water with a certain flow rate from the extension pipeline into the inlet pipeline and the ion exchange mechanism within a certain time, and then discharging the flushing sample water from the outlet pipeline so as to realize flushing before calibration of the meter to be flushed. By implementing the method, the flushing mode before the sodium meter calibration in the prior art can be improved, the accuracy of the sodium meter calibration is improved, the background can be rapidly reduced, the calibration efficiency is greatly improved, and the calibration time is shortened.
Description
Technical Field
The invention relates to the technical field of nuclear power overhaul, in particular to a method for maintaining a sodium meter in a nuclear power station.
Background
At present, a sodium meter in a nuclear power station monitors the water quality of REN secondary APG (nuclear power steam generator blowdown system) at an online time, and the obtained monitoring data is very important for chemical personnel and operating personnel. However, during the shutdown period of the unit, the sodium meter needs to be calibrated within one week before the unit goes upward, so that the sodium meter needs to be flushed before being calibrated, so that the accuracy of sodium meter calibration is not affected.
At present, the sodium meter is only simply washed by adopting a washing bottle before being calibrated, the interference of impurity ions and Na ions in a local elimination environment is difficult to achieve, and meanwhile, the background condition of the sodium meter is different from that of normal operation due to the washing mode, so that the sodium meter calibration accuracy is greatly influenced.
Therefore, a need exists for a sodium meter maintenance method, which can improve the existing sodium meter flushing method before calibration, not only improve the accuracy of sodium meter calibration, but also rapidly reduce the background, greatly improve the calibration efficiency, and shorten the calibration time.
Disclosure of Invention
The technical problem to be solved by the embodiment of the invention is to provide a method for maintaining a sodium meter in a nuclear power station, which can improve the flushing mode before the existing sodium meter calibration, not only improve the accuracy of the sodium meter calibration, but also rapidly reduce the background, greatly improve the calibration efficiency and shorten the calibration time.
In order to solve the technical problem, an embodiment of the present invention provides a method for maintaining a sodium meter in a nuclear power station, where the method includes:
determining a sodium meter to be flushed during shutdown of a nuclear power unit, and an inlet pipeline for accessing flushing sample water and an outlet pipeline for discharging the flushing sample water, which are preset on the sodium meter; wherein, the sample washing water is used for eliminating the interference of impurity ions and sodium ions in the sodium surface to be washed;
an ion exchange mechanism for eliminating hydrogen ion interference in the flushing sample water is arranged in the middle of the inlet pipeline; and
and additionally arranging an extension pipeline on the external opening end of the inlet pipeline, continuously introducing flushing sample water with a certain flow rate into the inlet pipeline and the ion exchange mechanism within a certain time, and then discharging the flushing sample water from the outlet pipeline, so as to flush the meter to be flushed before calibration.
Wherein the flushing sample water is SED water for removing impurity ions and sodium ions in the sodium surface to be flushed, the flow rate is between [35ml/min and 45ml/min ], and the duration is 5min to 10 min.
The ion exchange mechanism comprises a reagent bottle filled with an extractant inside and a diffusion tube which is immersed in the reagent bottle and communicated with the inlet pipeline so as to realize that the extractant permeates into the flushing sample water to eliminate hydrogen ion interference; wherein the content of the first and second substances,
the diffusion pipe is communicated with an inlet and an outlet which are arranged above the reagent bottle, and then is communicated with the inlet pipeline, and is made of a reverse osmosis membrane;
the pH value of the extracting agent is alkaline and can be neutralized with hydrogen ions in the flushing sample water.
Wherein the extractant is diisopropylamine solvent, and the pH value of the extractant is 11.
If the sodium meter to be flushed is one, the extension pipeline is a steel pipe made of stainless steel and has a pipe diameter of 1/4 inches.
If the number of the sodium meters to be washed is two, the extension pipelines are three steel pipes made of stainless steel, and the pipe diameters of the three steel pipes are 1/4 inches; wherein the content of the first and second substances,
the three steel pipes are communicated through a tee joint, one steel pipe is connected into the flushing sample water, and the other two steel pipes are respectively connected with the inlet pipelines of the two sodium meters to be flushed.
Wherein, all be equipped with flow control valve on the three steel pipe.
The embodiment of the invention has the following beneficial effects:
1. the invention introduces continuously supplied flushing sample water (such as SED water) by additionally arranging the extension pipeline, can rapidly reduce the content of sodium ions in the sodium meter measuring pool, thus rapidly reducing the background, greatly improving the calibration efficiency and shortening the calibration time, and simultaneously the flushing sample water in the extension pipeline eliminates hydrogen ion interference (namely ion exchange of diisopropylamine) by an ion exchange mechanism before entering the sodium meter for flushing, thereby ensuring the consistency of the background environment and further improving the accuracy of sodium meter calibration, thereby effectively improving the flushing mode before the existing sodium meter is calibrated;
2. the continuous maintenance of the sodium meter after the unit is shut down is realized, the electrode damage probability is reduced, and the maintenance workload during overhaul is reduced;
3. the invention can realize the mutual standby of two sodium meters by three extension pipelines formed by stainless steel pipes, thereby improving the reliability of the equipment.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is within the scope of the present invention for those skilled in the art to obtain other drawings based on the drawings without inventive exercise.
Fig. 1 is a flowchart of a method for maintaining a sodium table in a nuclear power plant according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a sodium meter in a method for maintaining the sodium meter in a nuclear power plant according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a sodium meter maintenance method in a nuclear power plant, in which an extension line is used to simultaneously connect two sodium meters.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, a method for maintaining a sodium table in a nuclear power plant according to an embodiment of the present invention includes the following steps:
step S1, determining a sodium meter to be washed during shutdown of the nuclear power unit, and an inlet pipeline for accessing washing sample water and an outlet pipeline for discharging the washing sample water, which are preset on the sodium meter; wherein, the sample washing water is used for eliminating the interference of impurity ions and sodium ions in the sodium surface to be washed;
step S2, arranging an ion exchange mechanism for eliminating interference of hydrogen ions in the flushing sample water in the middle of the inlet pipeline; and
and additionally arranging an extension pipeline on the external opening end of the inlet pipeline, continuously introducing flushing sample water with a certain flow rate into the inlet pipeline and the ion exchange mechanism within a certain time, and then discharging the flushing sample water from the outlet pipeline, so as to flush the meter to be flushed before calibration.
In step S1, first, a sodium meter to be washed during shutdown of the nuclear power plant is determined; then, on the sodium meter to be washed (see fig. 2), an inlet pipeline 1 for receiving the washing sample water and an outlet pipeline 2 for discharging the washing sample water are determined, that is, the washing sample water enters the sodium meter to be washed from the inlet pipeline 1 to be washed, and is washed until the outlet pipeline 2 discharges the washing sample water. Therefore, the interference of impurity ions and sodium ions in the measuring cell in the sodium meter to be washed can be eliminated by washing the sample water. It should be noted that the sample washing water should be deionized water (such as SED water) with high purity as much as possible to reduce the impurity ions carried by the sample washing water itself and avoid affecting the calibration of the sodium meter to be washed.
In step S2, an ion exchange mechanism 3 for eliminating interference of hydrogen ions in the flushing sample water is disposed in the middle of the inlet pipe 1, so that the hydrogen ions in the flushing sample water are neutralized by the ion exchange mechanism 3 to eliminate interference of hydrogen ions in the flushing sample water (for example, hydrogen ion exchange is performed by using diisopropylamine solvent), thereby ensuring consistency of background environment and improving accuracy of calibration of the sodium meter to be flushed.
Meanwhile, an extension pipeline 5 is additionally arranged on an external opening end (please refer to fig. 2) of the inlet pipeline 1, and flushing sample water with a certain flow rate is continuously introduced into the inlet pipeline 1 and the ion exchange mechanism 3 through the extension pipeline 5 within a certain time and then is discharged from the outlet pipeline 2, so that the meter to be flushed is flushed before calibration, the sodium ion content in the sodium meter measuring pool 4 can be rapidly reduced through the flushing sample water continuously supplied, the background is rapidly reduced, the calibration efficiency is greatly improved, and the calibration time is shortened.
In one embodiment, the sample washing water is SED water for removing impurity ions and sodium ions in the sodium surface to be washed, and the flow rate is between [35ml/min and 45ml/min ] and the duration is 5min to 10 min.
At this time, the ion exchange mechanism 3 includes a reagent bottle 31 filled with an extractant (such as diisopropylamine solvent) inside, and a diffusion tube 32 immersed in the reagent bottle 31 and communicated with the inlet pipeline 1 to realize that the extractant permeates into the sample washing water to eliminate hydrogen ion interference; wherein, the diffusion tube 32 is communicated with an inlet and an outlet arranged above the reagent bottle 31 to realize the communication with the inlet pipeline 1 and is made of a reverse osmosis membrane; the extractant has an alkaline pH (e.g., pH 11) and is capable of neutralizing the hydrogen ions in the flush water.
In the embodiment of the present invention, one sodium meter to be flushed may be flushed, or two sodium meters to be flushed may be flushed at the same time, and the structure of the extension line 5 needs to be simply improved, specifically as follows:
if a sodium meter to be flushed is flushed, the extension pipe 5 is a steel pipe made of stainless steel and having a pipe diameter of 1/4 inches, and the steel pipe may be provided with a flow control valve for flow control.
If two sodium meters to be washed are washed simultaneously, the extension pipeline 5 is three steel pipes made of stainless steel and the pipe diameters are 1/4 inches; the three steel pipes are communicated through a tee joint, one steel pipe is connected with flushing sample water, and the other two steel pipes are respectively connected with inlet pipelines of two sodium meters to be flushed; all be equipped with flow control valve on the three steel pipe and carry out flow control. In one embodiment, referring to fig. 3, the specific structure of the extension pipeline 5 is shown, in which a steel pipe REN 334VD and two steel pipes REN338VD are connected to form the extension pipeline through a tee joint, wherein the steel pipe REN 334VD introduces the sample washing water, and the two steel pipes REN338VD are respectively connected to two inlet pipes of the sodium salt to be washed. Certainly, the sodium meter to be flushed can be flushed by controlling the opening or closing of the flow control valves, for example, the flow control valves on the steel pipes REN 334VD are opened, one of the two steel pipes REN338VD corresponding to the flow control valve on the one is selected to be opened, and the other one of the two steel pipes REN338VD corresponding to the flow control valve on the other is closed, so that the two sets of sodium meters can be mutually standby at this time, and the reliability of the equipment is improved.
The embodiment of the invention has the following beneficial effects:
1. the invention introduces continuously supplied flushing sample water (such as SED water) by additionally arranging the extension pipeline, can rapidly reduce the content of sodium ions in the sodium meter measuring pool, thus rapidly reducing the background, greatly improving the calibration efficiency and shortening the calibration time, and simultaneously the flushing sample water in the extension pipeline eliminates hydrogen ion interference (namely ion exchange of diisopropylamine) by an ion exchange mechanism before entering the sodium meter for flushing, thereby ensuring the consistency of the background environment and further improving the accuracy of sodium meter calibration, thereby effectively improving the flushing mode before the existing sodium meter is calibrated;
2. the continuous maintenance of the sodium meter after the unit is shut down is realized, the electrode damage probability is reduced, and the maintenance workload during overhaul is reduced;
3. the invention can realize the mutual standby of two sodium meters by three extension pipelines formed by stainless steel pipes, thereby improving the reliability of the equipment.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.
Claims (7)
1. A method for maintaining a sodium meter in a nuclear power plant is characterized by comprising the following steps:
determining a sodium meter to be flushed during shutdown of a nuclear power unit, and an inlet pipeline for accessing flushing sample water and an outlet pipeline for discharging the flushing sample water, which are preset on the sodium meter; wherein, the sample washing water is used for eliminating the interference of impurity ions and sodium ions in the sodium surface to be washed;
an ion exchange mechanism for eliminating hydrogen ion interference in the flushing sample water is arranged in the middle of the inlet pipeline; and
and additionally arranging an extension pipeline on the external opening end of the inlet pipeline, continuously introducing flushing sample water with a certain flow rate into the inlet pipeline and the ion exchange mechanism within a certain time, and then discharging the flushing sample water from the outlet pipeline, so as to flush the meter to be flushed before calibration.
2. The method for maintaining the sodium meter in the nuclear power plant as recited in claim 1, wherein the washing sample water is SED water for removing impurity ions and sodium ions in the sodium meter to be washed, and the flow rate is between [35ml/min and 45ml/min ] and the duration is 5min to 10 min.
3. The method for maintaining the sodium meter in the nuclear power plant as claimed in claim 2, wherein the ion exchange mechanism comprises a reagent bottle filled with an extractant, and a diffusion tube which is immersed in the reagent bottle and is communicated with the inlet pipeline so as to realize that the extractant permeates into the washing sample water to eliminate interference of hydrogen ions; wherein the content of the first and second substances,
the diffusion pipe is communicated with an inlet and an outlet which are arranged above the reagent bottle, and then is communicated with the inlet pipeline, and is made of a reverse osmosis membrane;
the pH value of the extracting agent is alkaline and can be neutralized with hydrogen ions in the flushing sample water.
4. The method for maintaining a sodium table in a nuclear power plant as claimed in claim 3, wherein the extractant is a diisopropylamine solvent having a pH of 11.
5. The method for maintaining a sodium meter in a nuclear power plant as claimed in claim 1, wherein if there is one sodium meter to be flushed, the extension line is a steel pipe made of stainless steel and has a pipe diameter of 1/4 inches.
6. The method for maintaining a sodium meter in a nuclear power plant as claimed in claim 1, wherein if there are two sodium meters to be flushed, the extension line is three steel pipes made of stainless steel and each pipe diameter is 1/4 inches; wherein the content of the first and second substances,
the three steel pipes are communicated through a tee joint, one steel pipe is connected into the flushing sample water, and the other two steel pipes are respectively connected with the inlet pipelines of the two sodium meters to be flushed.
7. The method for maintaining the sodium meter in the nuclear power plant as recited in claim 6, wherein the three steel pipes are each provided with a flow control valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110939269.6A CN113680742A (en) | 2021-08-16 | 2021-08-16 | Maintenance method for sodium meter in nuclear power station |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110939269.6A CN113680742A (en) | 2021-08-16 | 2021-08-16 | Maintenance method for sodium meter in nuclear power station |
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| CN113680742A true CN113680742A (en) | 2021-11-23 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1419989A (en) * | 1972-03-20 | 1976-01-07 | Allied Chem | Method of removing a liquid contaminant from a surface |
| CN110763746A (en) * | 2019-10-21 | 2020-02-07 | 河北冀研能源科学技术研究院有限公司 | Online sodium surface electrode activator for power plant and application |
| CN211014189U (en) * | 2019-10-10 | 2020-07-14 | 中国大唐集团科学技术研究院有限公司华东电力试验研究院 | Online calibrating device of thermal power plant's sodium meter |
| CN113030226A (en) * | 2021-03-30 | 2021-06-25 | 大唐秦岭发电有限公司 | Online sodium meter calibration method |
-
2021
- 2021-08-16 CN CN202110939269.6A patent/CN113680742A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1419989A (en) * | 1972-03-20 | 1976-01-07 | Allied Chem | Method of removing a liquid contaminant from a surface |
| CN211014189U (en) * | 2019-10-10 | 2020-07-14 | 中国大唐集团科学技术研究院有限公司华东电力试验研究院 | Online calibrating device of thermal power plant's sodium meter |
| CN110763746A (en) * | 2019-10-21 | 2020-02-07 | 河北冀研能源科学技术研究院有限公司 | Online sodium surface electrode activator for power plant and application |
| CN113030226A (en) * | 2021-03-30 | 2021-06-25 | 大唐秦岭发电有限公司 | Online sodium meter calibration method |
Non-Patent Citations (1)
| Title |
|---|
| 王铸等: "两种钠表在电厂中的应用", 《黑龙江电力》 * |
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