CN103048029A - Liquid level measurement method and measurement device of auxiliary water feeding and deoxidation system - Google Patents
Liquid level measurement method and measurement device of auxiliary water feeding and deoxidation system Download PDFInfo
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- CN103048029A CN103048029A CN2012105321762A CN201210532176A CN103048029A CN 103048029 A CN103048029 A CN 103048029A CN 2012105321762 A CN2012105321762 A CN 2012105321762A CN 201210532176 A CN201210532176 A CN 201210532176A CN 103048029 A CN103048029 A CN 103048029A
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Abstract
The invention belongs to a liquid level measurement technology, particularly to a liquid level measurement method and a measurement device of an auxiliary water feeding and deoxidation system. The measurement method includes arranging guide wave radar liquid level meters respectively on a deaerator and a condensing water tank of the water feeding and deoxidation system through stable measurement barrels. Every guide wave radar liquid level meter is provided with a liquid level self-correct function and measures the liquid level of vapor-liquid-phase mediums in the deaerator and the condensing water tank to compensate the influence of the variation of vapor environment medium parameters to the accuracy of the liquid level measurement according to the principle that the transmission speed of electromagnetic waves in different mediums is different. The liquid level measurement method and the measurement device of the auxiliary water feeding and deoxidation system have the advantages of solving the problem that the liquid level accuracy is influenced by the temperature, the pressure and the density, reducing the frequency of device field maintenance and reducing the cost of purchase, installation and maintenance.
Description
Technical field
The invention belongs to the level gauging technology, be specifically related to a kind of level measuring method and measurement mechanism of auxiliary feedwater deaerating type of cycles.
Background technology
Auxiliary feedwater system is the ad hoc system of the important safety in the pressurized-water reactor nuclear power plant.For the water quality that guarantees auxiliary feedwater meets technical requirement, require the deaerating type of cycles of auxiliary feedwater to be in good running status.In the deaerating type of cycles design, the level gauging of oxygen-eliminating device and condensation water tank participates in closed-loop control, and the stability of measurement and measuring accuracy directly affect the operation of deaerating type of cycles.So for guaranteeing that auxiliary feedwater system is correct, safe operation, need precision and the higher requirement of reliability proposition to the level gauging of oxygen-eliminating device and condensation water tank thereof.Medium in auxiliary feedwater deaerator and the condensation water tank is two of vapour-liquids, and the container bottom is demineralized water, and top is steam.
In the design of nuclear power station in the past, the level gauging of auxiliary feedwater deaerator and condensation water tank uses is float-plane version level gauging instrument or differential pressure transmitter.Because working environment is different, the restriction of the conditions such as these two kinds of measuring methods are also installed, maintenance.
Wherein, there is following problems in the float-type liquid level measurement instrument in the use and maintenance process:
-measurement is subjected to temperature, pressure influence, and variable density can cause measuring error;
-volume is large, mechanical part is many, easily produces fault; And mechanical part is easy to wear, affects measuring accuracy;
-buying, installation, maintenance cost costliness, and field-checking difficulty;
Be the vapour-liquid two-phase in-oxygen-eliminating device and the condensation water tank, the variation of vapour phase pressure easily causes measuring error.
Use differential pressure transmitter to measure liquid level, equally also exist measurement result to be subjected to temperature, pressure influence, measuring error is larger.In addition, the accuracy of differential pressure transmitter measurement liquid level is also closely related with the position that differential pressure transmitter is installed, and steam bubble enters the increase that pressure guiding pipe can cause measuring error and field maintemance amount.
Summary of the invention
The object of the invention is to the defective for prior art, a kind of level measuring method for pressurized-water reactor nuclear power plant auxiliary feedwater system oxygen-eliminating device and condensation water tank thereof and measurement mechanism are provided, by adopt guided wave radar to measure liquid level, solved the easy fault, the maintenance cost that exist in original measuring method expensive, can't field-checking, easy to wear, measuring accuracy is subjected to medium parameter to change (temperature, pressure, density etc.) impact to wait greatly defective.
Technical scheme of the present invention is as follows: a kind of level measuring method of auxiliary feedwater deaerating type of cycles, on the oxygen-eliminating device of auxiliary feedwater deaerating type of cycles and condensation water tank thereof, by the Measurement sensibility cylinder guide wave radar liquid level gauge with liquid level self-correcting function is installed respectively, guide wave radar liquid level gauge utilizes the different principle of the transmission speed of electromagnetic wave in different medium, liquid level to vapour-liquid two-phase medium in oxygen-eliminating device and the condensation water tank thereof is measured, with the impact of compensation steam ambient medium parameter variation on the level gauging accuracy; According to the difference of system, the Measurement sensibility cylinder of guided wave radar liquid level is installed on the level gauging cylinder of equipment under test, perhaps directly is installed on the equipment under test.
A kind of liquid level emasuring device of auxiliary feedwater deaerating type of cycles, comprise measuring cylinder (according to designing requirement), the guide wave radar liquid level gauge with liquid level self-correcting function and Measurement sensibility cylinder thereof, guide wave radar liquid level gauge is installed on the Measurement sensibility cylinder by flange, and the Measurement sensibility cylinder is connected with oxygen-eliminating device, level gauging cylinder that condensation water tank is corresponding respectively by communicating pipe and companion flange.
Further, the liquid level emasuring device of aforesaid auxiliary feedwater deaerating type of cycles, wherein, described Measurement sensibility cylinder is connected by the side side interface level gauging cylinder corresponding with oxygen-eliminating device or condensation water tank, and the distance between the side side interface is the measurement range of designing requirement.
Further, the opening that is connected with measuring cylinder on oxygen-eliminating device or the condensation water tank is away from charging aperture and stirrer position, and the required measurement range of process operation is contained in the position of upper and lower opening.
Further, the liquid level emasuring device of aforesaid auxiliary feedwater deaerating type of cycles, wherein, described guide wave radar liquid level gauge is installed in the upper end of Measurement sensibility cylinder, and the guided wave bar is inserted into the measurement range of designing requirement.
Beneficial effect of the present invention is as follows:
(1) guide wave radar liquid level gauge has utilized the electromagnetic wave principle, has solved the problem that measuring accuracy is subjected to temperature, pressure and Effects of Density from principle;
(2) guide wave radar liquid level gauge compact conformation, simple in structure, easy for installation, non mechanical movable, fault is few, can greatly reduce the number of times of field maintemance maintenance;
(3) do not need field-checking, measuring accuracy is high, and buying and installation and maintenance expense are low;
(4) by selecting the guide wave radar liquid level gauge with the liquid level self-correcting function, solved the problem of the measuring accuracy variation that disturbed by volume top steam and bring, and can not reduce because of the existence of vapour-liquid two-phase measuring accuracy and increase maintenance;
(5) undesirable floating drum or the differential pressure type level gauge of result of use in the present invention's replaceable in the past power plant under operation of while changed simply, and be easy for installation, do not need in addition perforate on equipment, reduces potential safety hazard.
Description of drawings
Fig. 1 is auxiliary feedwater deaerating type of cycles schematic flow sheet;
Fig. 2 is oxygen-eliminating device level gauging instrument scheme of installation;
Fig. 3 is oxygen-eliminating device system condensing water pot level gauging instrument scheme of installation.
Embodiment
Below in conjunction with drawings and Examples the present invention is described in detail.
The present invention on the level gauging cylinder of the oxygen-eliminating device of auxiliary feedwater deaerating type of cycles and condensation water tank thereof by being connected or isolation valve with companion flange communicating pipe) be connected with the Measurement sensibility cylinder, on the Measurement sensibility cylinder, by flange the guide wave radar liquid level gauge with liquid level self-correcting function is installed respectively, is cancelled original habitual float-type or differential pressure type level gauge.The basic procedure of system as shown in Figure 1, on the level gauging cylinder 4,8 of the oxygen-eliminating device 1 of auxiliary feedwater deaerating type of cycles and condensation water tank 2 thereof, by the Measurement sensibility cylinder guide wave radar liquid level gauge 6,7 with liquid level self-correcting function is installed respectively, condensation water tank 2 connects condenser 3, and condenser 3 connects pneumatic control valve 5.Guide wave radar liquid level gauge 6,7 utilizes the different principle of the transmission speed of electromagnetic wave in different medium, liquid level to vapour-liquid two-phase medium in oxygen-eliminating device and the condensation water tank thereof is measured, with the impact of compensation steam ambient medium parameter variation on the level gauging accuracy.
Method provided by the invention does not need other perforate, utilizes the existing perforate of original differential pressure transmitter or float level meter, mates suitable installation accessories, easily existing measurement mechanism is changed.Simple to operate, it is convenient to change, and cost is low and can not increase potential safety hazard.
The selected guide wave radar liquid level gauge of the present invention is provided with the steam target, can detect in real time the electromagnetic speed under different temperatures, the pressure, and the actual conduction of velocity of the electromagnetic wave that detects sent into processing unit, compensate calculating, the indeterminable problem that causes thereby the self-correcting of realization liquid level, solution container top have steam.Simultaneously; the used instrument of the present invention also has the technology such as vapor-proof condensation, vapor-proof infiltration and special heat-radiating, can solve well the steam measuring error that condensation may bring on waveguide pipe, can also protect guided wave bar and transducing unit not to be damaged by High Temperature High Pressure simultaneously.
As depicted in figs. 1 and 2, the level gauging instrument is mounted on the Measurement sensibility cylinder, forms an integral body 6 with the Measurement sensibility cylinder.The Measurement sensibility cylinder is connected with the level gauging cylinder 4 of oxygen-eliminating device by the side side interface, the distance of the side side interface of general measure stabilizing sleeve is the measurement range of designing requirement, the required measurement range of process operation should be able to be contained in the upper and lower opening position of oxygen-eliminating device 1 upper and lower opening position and oxygen-eliminating device level gauging cylinder 4, and the interface position between oxygen-eliminating device and the level gauging cylinder should be away from positions such as charging aperture and stirrers, with stability and the measuring accuracy that guarantees to measure.The position of the aperture position of the aperture position of level stability cylinder and level gauging cylinder and the measurement range of instrument and instrument flange is complementary, and can guarantee to install and measuring accuracy.The guide wave radar liquid level gauge top is contained in the upper end of the Measurement sensibility cylinder that is connected with oxygen-eliminating device level gauging cylinder 4 and fixes by instrument flange and companion flange, and the guided wave bar is inserted into the measurement range of designing requirement.The used flange of instrument satisfies respective standard, to guarantee its bearing capacity.Companion flange is connected with the mode of equipment under test with welding, to guarantee the sealing of pressure-bearing boundary; Instrument flange and companion flange pass through bolt tightening.Behind the instrument installation in position, can use by simple debugging.
The selected guide wave radar liquid level gauge of the present invention is provided with the steam target, can detect in real time the electromagnetic speed under different temperatures, the pressure, and the actual conduction of velocity of the electromagnetic wave that detects sent into processing unit, compensate calculating, the indeterminable problem that causes thereby the self-correcting of realization liquid level, solution container top have steam.Simultaneously; the used instrument of the present invention also has the technology such as vapor-proof condensation, vapor-proof infiltration and special heat-radiating, can solve well the steam measuring error that condensation may bring on waveguide pipe, can also protect guided wave bar and transducing unit not to be damaged by High Temperature High Pressure simultaneously.
As shown in figures 1 and 3, the Measurement sensibility cylinder is connected with the level gauging cylinder 8 of condensation water tank 2 by the side side interface, the distance of the side side interface of general measure stabilizing sleeve is the measurement range of designing requirement, the required measurement range of process operation should be able to be contained in the upper and lower opening position of condensation water tank 2 upper and lower opening positions and level gauging cylinder 8, with stability and the measuring accuracy that guarantees to measure.This aperture position and the measurement range of instrument and the position of instrument flange are complementary simultaneously, can guarantee to install and measuring accuracy.Opening connecting tube between condensation water tank 2 and level gauging cylinder is provided with pneumatic control valve.The guide wave radar liquid level gauge top is contained on the Measurement sensibility cylinder, and is fixed in Measurement sensibility cylinder upper end by instrument flange and companion flange, and the measurement range that the guided wave bar is inserted into designing requirement forms an integral body 7, links to each other with level gauging cylinder 8.The used flange of instrument satisfies respective standard, to guarantee its bearing capacity.Companion flange is connected with the mode of equipment under test with welding, to guarantee the sealing of pressure-bearing boundary; Instrument flange and companion flange pass through bolt tightening.Behind the instrument installation in position, can use by simple debugging.
The present invention not only solves auxiliary feedwater deaerating type of cycles condensation water tank level measuring problem, is applied to equally the level gauging of all vapour-liquid two-phase environment, to solve the inaccurate problem of level measuring that causes thus.The present invention also is applicable to the higher occasion of temperature, pressure, can overcome well float-type pressure unit etc. heavy in High Temperature High Pressure situation lower volume, the problems such as installation, type selecting difficulty.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technology thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (5)
1. the level measuring method of an auxiliary feedwater deaerating type of cycles, it is characterized in that: on the oxygen-eliminating device of auxiliary feedwater deaerating type of cycles and condensation water tank thereof, by the Measurement sensibility cylinder guide wave radar liquid level gauge with liquid level self-correcting function is installed respectively, guide wave radar liquid level gauge utilizes the different principle of the transmission speed of electromagnetic wave in different medium, liquid level to vapour-liquid two-phase medium in oxygen-eliminating device and the condensation water tank thereof is measured, with the impact of compensation steam ambient medium parameter variation on the level gauging accuracy; According to the difference of system, the Measurement sensibility cylinder of guided wave radar liquid level is installed on the level gauging cylinder of equipment under test, perhaps directly is installed on the equipment under test.
2. the liquid level emasuring device of an auxiliary feedwater deaerating type of cycles, it is characterized in that: comprise the measuring cylinder (4,8) that is connected with oxygen-eliminating device (1) and condensation water tank (2) thereof respectively by communicating pipe and companion flange, guide wave radar liquid level gauge and Measurement sensibility cylinder (6,7) thereof with liquid level self-correcting function are installed on the measuring cylinder by flange.
3. the liquid level emasuring device of auxiliary feedwater deaerating type of cycles as claimed in claim 2, it is characterized in that: described measuring cylinder (4,8) is connected with oxygen-eliminating device (1) or condensation water tank (2) by the side side interface, and the distance between the side side interface is the measurement range of designing requirement.
4. the liquid level emasuring device of auxiliary feedwater deaerating type of cycles as claimed in claim 3, it is characterized in that: the upper opening that is connected with measuring cylinder (4,8) of oxygen-eliminating device (1) or condensation water tank (2) is away from charging aperture and stirrer position, and the required measurement range of process operation is contained in the position of upper and lower opening; The required measurement range of process operation also can be contained in the upper and lower opening position that measuring cylinder is connected with the Measurement sensibility cylinder.
5. the liquid level emasuring device of auxiliary feedwater deaerating type of cycles as claimed in claim 2, it is characterized in that: described guide wave radar liquid level gauge (6,7) is installed in the upper end of Measurement sensibility cylinder, and the guided wave bar is inserted into the measurement range of designing requirement; Liquid level gauge and Measurement sensibility cylinder are as liquid level emasuring device, and integral installation is on the level gauging cylinder.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012105321762A CN103048029A (en) | 2012-12-11 | 2012-12-11 | Liquid level measurement method and measurement device of auxiliary water feeding and deoxidation system |
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| CN2012105321762A CN103048029A (en) | 2012-12-11 | 2012-12-11 | Liquid level measurement method and measurement device of auxiliary water feeding and deoxidation system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109596856A (en) * | 2018-12-25 | 2019-04-09 | 北京奥特美克科技股份有限公司 | Apply the flow-speed measurement method and radar wave current meter in radar wave current meter |
| CN113860415A (en) * | 2021-09-24 | 2021-12-31 | 中广核陆丰核电有限公司 | Nuclear power plant emergency water supply tank deoxygenation method, water supply system and catalytic deoxygenation device |
| WO2023245580A1 (en) * | 2022-06-23 | 2023-12-28 | 时代思康新材料有限公司 | Liquid level measurement method and apparatus for reactor, and reactor having same |
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| CN201045585Y (en) * | 2007-01-31 | 2008-04-09 | 泰安市泰山东城热电有限责任公司 | Pressure container glass tube liquid level meter |
| CN201126371Y (en) * | 2007-11-05 | 2008-10-01 | 丹东通博电器(集团)有限公司 | Side-installed integration type guided wave radar level transmitter |
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| CN201045585Y (en) * | 2007-01-31 | 2008-04-09 | 泰安市泰山东城热电有限责任公司 | Pressure container glass tube liquid level meter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109596856A (en) * | 2018-12-25 | 2019-04-09 | 北京奥特美克科技股份有限公司 | Apply the flow-speed measurement method and radar wave current meter in radar wave current meter |
| CN113860415A (en) * | 2021-09-24 | 2021-12-31 | 中广核陆丰核电有限公司 | Nuclear power plant emergency water supply tank deoxygenation method, water supply system and catalytic deoxygenation device |
| WO2023245580A1 (en) * | 2022-06-23 | 2023-12-28 | 时代思康新材料有限公司 | Liquid level measurement method and apparatus for reactor, and reactor having same |
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