CN210071429U - Suspended iron sampling system applied to secondary loop of nuclear power station - Google Patents
Suspended iron sampling system applied to secondary loop of nuclear power station Download PDFInfo
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- CN210071429U CN210071429U CN201920501893.6U CN201920501893U CN210071429U CN 210071429 U CN210071429 U CN 210071429U CN 201920501893 U CN201920501893 U CN 201920501893U CN 210071429 U CN210071429 U CN 210071429U
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Abstract
The utility model relates to the technical field of secondary loop water chemistry of a nuclear power station, and provides a suspended iron sampling system applied to a secondary loop of the nuclear power station, which comprises a sampling pipeline and a bypass pipeline, wherein the bypass pipeline comprises a first branch connected with the sampling pipeline, and a second branch and a third branch which are respectively communicated with the first branch; at least one sampling control valve is arranged on the sampling pipeline, a first regulating valve, a filter and a flowmeter are sequentially arranged on the second branch pipeline along the water flowing direction, and a second regulating valve is arranged on the third branch pipeline. Compared with the prior art, the utility model provides a be applied to suspension iron sampling system in nuclear power station two return circuits, the flow in the second branch road keeps relatively stable to can acquire sufficient pre-analysis's sample, improve the measurement accuracy.
Description
Technical Field
The utility model belongs to the technical field of the two return circuits of nuclear power station water chemistry's technique and specifically relates to a be applied to two return circuits of nuclear power station suspension iron sampling system.
Background
The production and source of ferrous corrosion products in the secondary circuit of a pressurized water reactor nuclear power plant unit is of increasing concern to operators because of the high operating and maintenance costs associated with ferrous corrosion resulting in lost power production, such as pipe bursting due to accelerated corrosion of the secondary circuit flow rate, corrosion and degradation problems due to accumulation of ferrous corrosion products in the steam generator, and the like, and obviously, the production of ferrous corrosion products increases the operating and maintenance costs. Obtaining accurate corrosion product data in the steam loop is very important to plant operating decisions. The research on the distribution and transmission of corrosion product iron of the two-loop thermodynamic system is also an important basis for carrying out two-loop accelerated corrosion research and calculating important parameters of pipeline thinning by a power station professional department and carrying out improvement on a two-loop water chemistry regulation optimization technology. For this purpose, the corrosion state of the equipment can be measured by monitoring the suspended iron content in different parts of the two loops, so as to estimate the total amount of iron entering the steam generator.
Currently, most of the nuclear industry is old design before 80 years, and the traditional method is to sample a certain volume, such as 150ml, by a sampling pipeline, add nitric acid, measure the total iron content of sample water by an atomic absorption method, thereby representing the corrosion state of the system. However, the disadvantage is that the suspended iron is a suspension liquid uneven system, and after passing through the zigzag sampling pipeline, the electroplating effect is generated, most of the suspended iron is deposited on the sampling pipeline, the obtained sample suspended iron is low, or the measured result is high due to the fact that the deposited sample is washed down because of uncertain sampling flow, and the measured result deviates from the true value and is inaccurate.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a be applied to suspension iron sampling system in two return circuits of nuclear power station to the sample volume of the sample pipeline that exists among the solution prior art is not enough, and the inhomogeneity of suspension in the sample, leads to the technical problem of the accuracy of unable assurance measurement.
In order to achieve the above object, the utility model adopts the following technical scheme: the suspended iron sampling system applied to the secondary loop of the nuclear power station further comprises a sampling pipeline and a bypass pipeline, wherein the bypass pipeline comprises a first branch connected with the sampling pipeline, and a second branch and a third branch which are respectively communicated with the first branch; the water sampling device is characterized in that at least one sampling control valve is arranged on the first branch, a first adjusting valve, a filter and a flowmeter are sequentially arranged on the second branch along the water flowing direction, and a second adjusting valve is arranged on the third branch.
Further, a first cooling rack and a second cooling rack are arranged on the sampling pipeline, and the second cooling rack is positioned at the downstream of the first cooling rack; the connection point of the sampling pipeline and the bypass pipeline is positioned between the first cooling rack and the second cooling rack.
Further, the sampling pipe has a vertical section extending in a direction perpendicular to the ground, and a connection point of the sampling pipe and the bypass pipe is located on the vertical section.
Furthermore, the flow rate of the water outlet of the sampling control valve is more than 150L/h.
Further, the flow rate of the second branch is 0.2-0.25L/min.
Further, the number of the sampling control valves is two, and the sampling control valves are respectively a first sampling control valve and a second sampling control valve.
Further, the filter comprises a support and a gland, the support is provided with an inner cavity and an access opening which is communicated with the inner cavity and is used for the filter membrane to be put in and taken out of the inner cavity, and the gland is detachably connected to the support and can close the access opening.
Further, the filter membrane has relative first face and second face, and the first face is the plain noodles, and the second face is the roughness, and the filter membrane is with first face mode up sets up in the inner chamber.
Further, the water outlet of the second branch and/or the water outlet of the third branch are/is connected with a sewage system.
Further, the second branch includes a hose segment between the first regulator valve and the filter.
Compared with the prior art, the utility model provides a be applied to nuclear power station secondary circuit's suspension iron sampling system adopts the bypass pipeline, and it includes the first branch road that links to each other with the sample pipeline and second branch road and the third branch road that communicates with first branch road respectively; set up the sample control valve on the first branch road, set up first governing valve, filter and flowmeter on the second branch road, be provided with the second governing valve on the third branch road, like this, through the liquid that the filter filtration was waited to filter, the pending suspension iron sample of measurand has been obtained to flow in the second branch road is controlled by first governing valve and second governing valve, makes the flow in the second branch road keep relatively stable, thereby can obtain sufficient sample of preanalysis, has improved and has measured the accuracy.
Drawings
Fig. 1 is a flow chart of a suspended iron sampling system according to an embodiment of the present invention;
fig. 2 is a schematic perspective view of a suspended iron sampling system according to an embodiment of the present invention.
Description of the main elements
100: suspended iron sampling system
10: sampling pipeline 11: first cooling rack
12: second cooling rack 13: connection point
14: a sewage system 15: water collecting tray
20: bypass line 21: first branch
22: second branch 23: third branch
24: first regulating valve 25: filter
26: the flow meter 27: second regulating valve
28: first sampling control valve 29: second sampling control valve
Detailed Description
In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It is to be understood that the embodiments described are some, but not all embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive work based on the described embodiments of the present invention, belong to the protection scope of the present invention.
In order to make those skilled in the art better understand the technical solution of the present invention, the following detailed description is provided for the implementation of the present invention with reference to the specific drawings.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the description and in the claims does not indicate any order, quantity, or importance, but rather is used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one.
As shown in fig. 1 and 2, a preferred embodiment of the present invention is provided.
The suspended iron sampling system 100 applied to the secondary loop of the nuclear power plant provided by the embodiment includes a sampling pipeline 10 and a bypass pipeline 20, wherein the bypass pipeline 20 includes a first branch 21 connected to the sampling pipeline 10, and a second branch 22 and a third branch 23 respectively communicated with the first branch 21; at least one sampling control valve is arranged on the first branch 21, a first regulating valve 24, a filter 25 and a flowmeter 26 are sequentially arranged on the second branch 22 along the water flowing direction, and a second regulating valve 27 is arranged on the third branch 23.
The suspended iron sampling system 100 applied to the second loop of the nuclear power plant adopts the bypass pipeline 20, which comprises a first branch 21 connected with the sampling pipeline 10, and a second branch 22 and a third branch 23 respectively communicated with the first branch 21; the sampling control valve is arranged on the first branch 21, the first regulating valve 24, the filter 25 and the flowmeter 26 are arranged on the second branch 22, and the second regulating valve 27 is arranged on the third branch 23, so that liquid to be filtered is filtered through the filter 25, a suspended iron sample to be measured is obtained, the flow in the second branch 22 is controlled through the first regulating valve 24 and the second regulating valve 27, the flow in the second branch 22 is kept relatively stable, a sufficient pre-analyzed sample can be obtained, and the measurement accuracy is improved.
The suspended iron sampling system 100 provided by the embodiment is used in a two-loop thermodynamic system (i.e., a two-loop system, which is a unified technical term and is hereinafter referred to as a two-loop system) of a pressurized water reactor nuclear power plant, and mainly optimizes a sampling pipeline of the sampling system of a two-loop water supply system, and samples suspended iron by arranging the bypass pipeline 20 on the sampling pipeline 10. For the selection of the sampling point, the sampling point can be set through the sampling pipeline 10 with the shortest distance between the water supply and the shortest pipeline, the sampling point is the connection point 13 between the sampling pipeline 10 and the bypass pipeline 20, and the sampling point is prevented from being set on the circuitous pipeline as much as possible, so that the accuracy of measurement can be improved.
Referring to fig. 1 and 2, the suspended iron sampling system 100 provided in this embodiment is applied to a two-circuit steam-water circuit (also referred to as a steam-water separation reheating system), and because water separated by the steam-water circuit has a relatively high temperature, two cooling racks, namely a first cooling rack 11 and a second cooling rack 12, are disposed between the sampling pipeline 10 and the sewage system 14 of the circuit, and the second cooling rack 12 is located downstream of the first cooling rack 11 in a water flow direction, so as to reduce the temperature of water flowing into the sewage system 14. The connection point 13 between the sampling pipeline 10 and the bypass pipeline 20 is located between the first cooling rack 11 and the second cooling rack 12, and it should be noted that, because the temperature of water separated from the steam-water loop is high, the suspended iron of water is selected to be sampled after the water is cooled by the first cooling rack 11, so that the sampling point is arranged between the first cooling rack 11 and the second cooling rack 12 and is close to the position of the first cooling rack 11.
In particular, the sampling pipe 10 has a vertical section extending in a direction perpendicular to the ground, and the sampling point is disposed on the vertical section, that is, the connection point 13 of the sampling pipe 10 and the bypass pipe 20 is located on the vertical section, considering that the sampling detection efficiency of the vertical section may be higher than that of the horizontal section and the curved section.
With continued reference to fig. 1 and 2, the bypass line 20 includes a first branch 21, a second branch 22 and a third branch 23, one end of the first branch 21 is connected to the sampling line 10, the other end of the first branch forms a branch point, the second branch 22 and the third branch 23 are both connected to the branch point, and the water outlet end of the second branch 22 and the water outlet end of the third branch 23 are both connected to the sewage system 14. The first branch 21 is provided with a sampling control valve, the second branch 22 is provided with a first regulating valve 24, a filter 25 and a flowmeter 26 in sequence along the water flowing direction, and the third branch 23 is provided with a second regulating valve 27. The flow meter 26 is capable of sensing the flow of liquid in the second branch 22 for viewing and review by an operator. In the present embodiment, the number of sampling control valves is, but not limited to, two, and the first sampling control valve 28 and the second sampling control valve 29 are provided. The first regulating valve 24, the filter 25 and the flow meter 26 are connected in series on the second branch 22, the second branch 22 comprises a hose section between the first regulating valve 24 and the filter 25, the second regulating valve 27 is connected in parallel with the first regulating valve 24, and the water in the second branch 22 and the water in the third branch 23 are both discharged into the water collecting tray 15. It is easy to understand, open sample control valve, first governing valve 24 back in proper order, during the water of sample pipeline 10 can flow into second branch road 22 through first branch road 21, water process filter 25 back, filter 25 can filter the suspension iron, and flow in the flowmeter 26 conveniently monitors the branch road to control flow is in predetermineeing the scope, like this, can increase sample time and sample volume, has improved suspension iron measuring accuracy.
In particular, at the time of sampling, the flow rate in the second branch 22 is selected in a preset range of values from 0.2 to 0.25L/min, which can be read and controlled by the flow meter 26, it being easily understood that, since the first regulating valve 24 and the second regulating valve 27 are arranged in parallel, after the first regulating valve 24 is fully opened, the flow rate in the second branch 22 can be controlled by gradually closing the second regulating valve 27. It is worth mentioning that when the flow rate in the second branch 22 is lower than the preset range value (which can be observed by the flow meter 26), the second regulating valve 27 is continuously closed, so as to keep the value indicated by the flow meter 26 relatively stable.
Referring to fig. 1 and 2, the filter 25 includes a holder having an inner cavity (not shown) and an access port (not shown) communicating with the inner cavity and allowing a filter membrane (not shown) to be inserted into and removed from the inner cavity, and a cover (not shown) removably attached to the holder and capable of closing the access port. In this embodiment, the support is disc shape, and the gland has the circular shape cross section with support looks adaptation, and adopts threaded connection between support and the gland, that is to say, unscrew behind the gland, just can take out the filter membrane and put into new filter membrane, screw behind the gland, can fix the gland on the support to make things convenient for taking out and putting into of filter membrane.
In this embodiment, can be according to pipe diameter size, the temperature of water, flow isoparametric, come the filter 25 and the filter membrane of selection matching, the filter membrane has relative first face and second face, and the first face is the plain noodles, and the second face is the rough surface, and the filter membrane sets up in the inner chamber with first face mode up. It will be readily appreciated that during filtration, the water to be filtered passes over the roughened surface first and then over the smooth surface, so that during installation of the filter membrane, the first surface of the filter membrane is mounted facing upwards.
The operation of the present embodiment will be described in detail with reference to fig. 1 and 2, wherein the sampling operation of the present embodiment includes a draining operation before sampling and a continuous sampling operation:
for the drainage operation before sampling, mainly to confirm that the sampling pipeline 10 is in the running state and the suspended iron sampling system 100 has no leakage, the downstream of the second regulating valve 27 is not connected with other equipment, and the method specifically comprises the following steps:
closing the first regulating valve 24;
fully open second regulator valve 27;
fully opening the first sampling control valve 28;
the second sampling control valve 29 is slowly opened to adjust the drainage flow rate of the first branch 21 to be more than or equal to 150L/h (the flow rate can be obtained by measuring and calculating the flow rate at the drainage pipe by using a measuring cup), and the drainage time is about 20 min.
A continuous sampling operation comprising the steps of:
unscrewing a gland of the filter 25, cleaning the support, then filling the two filter membranes into the support, wetting, and screwing the gland tightly;
slowly fully opening the first regulating valve 24;
slowly closing the second regulating valve 27, regulating the opening of the second regulating valve 27 until the indication value of the flowmeter 26 is 0.2-0.25L/min (or 200-250 CC/min), and then keeping the indication value of the flowmeter 26;
continuous sampling: keeping the indication value of the flowmeter 26 at 0.2-0.25L/min (or 200-250 CC/min), inspecting the running condition of the sampling device every day, checking whether the indication value of the flowmeter 26 is normal or not, and ensuring that the system has no leakage;
after the desired sampling time is reached, recording the cumulative total volume of the flow meter 26 at the end of the sampling;
closing the first sampling control valve 28 and the second sampling control valve 29;
sequentially closing the first regulating valve 24 and the second regulating valve 27;
unscrewing a gland, taking out the filter membrane, putting the filter membrane into a clean surface dish, and sending the filter membrane to a laboratory for sample pretreatment and analysis;
if the sampling is continued, the steps are repeatedly executed; otherwise, screwing the gland tightly and finishing sampling.
The suspended iron sampling system 100 of the present embodiment also has the following beneficial effects:
1. the design method is characterized in that transformation and optimization are carried out on the basis of the design of the existing sampling pipeline 10, a suspended iron sampling system 100 and a method are established, and important parameters are provided for calculating pipeline thinning and accelerated corrosion of a secondary loop fluid;
2. important basis is provided for the improvement of the two-loop water chemistry regulation and optimization technology;
3. and acquiring accurate corrosion product data in the water vapor loop, and calculating the accumulated dirt amount of the corrosion product transmitted to the steam generator in the whole power cycle so as to provide decision basis for chemical cleaning or other operation maintenance of the steam generator of the power station.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modification, equivalent replacement or improvement made within the spirit and principle of the present invention should be included in the present invention.
Claims (10)
1. A suspended iron sampling system applied to a secondary loop of a nuclear power station is characterized by comprising a sampling pipeline and a bypass pipeline, wherein the bypass pipeline comprises a first branch connected with the sampling pipeline, and a second branch and a third branch which are respectively communicated with the first branch; the water sampling device is characterized in that at least one sampling control valve is arranged on the first branch, a first adjusting valve, a filter and a flowmeter are sequentially arranged on the second branch along the water flowing direction, and a second adjusting valve is arranged on the third branch.
2. The suspended iron sampling system applied to the secondary loop of the nuclear power plant as claimed in claim 1, wherein a first cooling rack and a second cooling rack are arranged on the sampling pipeline, and the second cooling rack is positioned at the downstream of the first cooling rack; the connection point of the sampling pipeline and the bypass pipeline is positioned between the first cooling rack and the second cooling rack.
3. The system of claim 1, wherein the sampling pipe has a vertical section extending in a direction perpendicular to the ground, and the connection point of the sampling pipe and the bypass pipe is located on the vertical section.
4. The suspended iron sampling system applied to the secondary loop of the nuclear power plant as claimed in claim 1, wherein the flow rate of the water outlet of the sampling control valve is more than 150L/h.
5. The system of claim 1, wherein the flow rate of the second branch is 0.2 to 0.25L/min.
6. The system of claim 1, wherein the number of the sampling control valves is two, and the sampling control valves are a first sampling control valve and a second sampling control valve.
7. The system as set forth in claim 1, wherein said filter comprises a support having an interior cavity and an access opening communicating with said interior cavity for access to and removal of a filter membrane from said interior cavity, and a gland removably attached to said support and capable of closing said access opening.
8. The system as set forth in claim 7, wherein said filter membrane has opposite first and second faces, said first face being smooth and said second face being rough, said filter membrane being disposed in said interior cavity with said first face facing upwardly.
9. The system for sampling suspended iron applied to the secondary loop of the nuclear power plant as recited in claim 1, wherein the water outlet of the second branch and/or the third branch is connected to a sewage system.
10. The system of claim 1, wherein the second branch comprises a hose section between the first regulator valve and the filter.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920501893.6U CN210071429U (en) | 2019-04-11 | 2019-04-11 | Suspended iron sampling system applied to secondary loop of nuclear power station |
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| CN201920501893.6U CN210071429U (en) | 2019-04-11 | 2019-04-11 | Suspended iron sampling system applied to secondary loop of nuclear power station |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112284834A (en) * | 2020-11-15 | 2021-01-29 | 西安热工研究院有限公司 | Steam-water sampling suspended iron and ionic iron separation device and corresponding iron content determination method |
| CN112683829A (en) * | 2021-02-05 | 2021-04-20 | 三门核电有限公司 | Sampling detection method for corrosion products in nuclear power plant water sample |
-
2019
- 2019-04-11 CN CN201920501893.6U patent/CN210071429U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112284834A (en) * | 2020-11-15 | 2021-01-29 | 西安热工研究院有限公司 | Steam-water sampling suspended iron and ionic iron separation device and corresponding iron content determination method |
| CN112683829A (en) * | 2021-02-05 | 2021-04-20 | 三门核电有限公司 | Sampling detection method for corrosion products in nuclear power plant water sample |
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