CN111007112B - System and method for online measurement of steam humidity based on conductivity method - Google Patents
System and method for online measurement of steam humidity based on conductivity method Download PDFInfo
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- CN111007112B CN111007112B CN201911016913.1A CN201911016913A CN111007112B CN 111007112 B CN111007112 B CN 111007112B CN 201911016913 A CN201911016913 A CN 201911016913A CN 111007112 B CN111007112 B CN 111007112B
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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
- G01N27/10—Investigation or analysis specially adapted for controlling or monitoring operations or for signalling
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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
- G01N27/048—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance for determining moisture content of the material
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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
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21D—NUCLEAR POWER PLANT
- G21D1/00—Details of nuclear power plant
- G21D1/006—Details of nuclear power plant primary side of steam generators
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
Abstract
The invention relates to a system and a method for online measuring steam humidity based on a conductivity method, wherein a steam outlet of a steam generator is connected with a steam inlet of a steam-water separator, a circulating water outlet of the steam-water separator is connected with a water inlet of the steam generator through a recirculating water pipe, the system comprises a steam sampling system connected with the steam outlet of the steam-water separator, a recirculating water sampling system connected with the recirculating water pipe and a measuring system, the measuring system comprises a conductivity meter and an instrument control terminal which are electrically connected, the conductivity meter is respectively used for measuring the conductivity of condensed water in a condensed water collecting container and the conductivity of recirculating water in a cooling water collecting container, the conductivity meter transmits measured data to the instrument control terminal, and the instrument control terminal processes the data to obtain the steam humidity. The invention has simple principle and convenient operation, can carry out on-line measurement on the high-temperature and high-pressure steam humidity, and effectively improves the accuracy of steam humidity measurement.
Description
Technical Field
The invention relates to the technical field of steam humidity measurement, in particular to a system and a method for online measurement of steam humidity based on a conductivity method.
Background
Steam humidity at the outlet of the steam generator is a key parameter in the operation process of the nuclear power station, and the size of the steam humidity directly influences the safe and efficient operation of a nuclear power system. The steam-water separator can effectively dehumidify wet saturated steam in the steam generator, can greatly improve the steam quality of an outlet of the steam generator, and is a key device in the operation of a nuclear power station.
In the development process of the steam-water separator, the performance of the steam-water separator needs to be verified and tested, and the steam humidity at the outlet of the steam-water separator is an important index for evaluating the working performance of the steam-water separator. Common steam humidity measuring methods comprise a throttling method, a heating method, a tracer method and the like, wherein the throttling method is convenient to test and simple to use, but cannot measure and calculate heat loss in the throttling process, and has a large error; the heater processing technology of the heating method is complex, the heat loss in the heating process cannot be accurately calculated, and the error is large; the tracer method is a mainstream measurement method for steam humidity of the nuclear power station at present, is mature in measurement technology and high in measurement precision, cannot achieve online measurement, and cannot provide real-time and effective steam humidity data for operation management of the nuclear power station.
Disclosure of Invention
The invention aims to provide a system and a method for online measuring steam humidity based on a conductivity method.
In order to solve the above problems, the present invention provides a system for online measurement of steam humidity based on a conductivity method, wherein a steam outlet of a steam generator is connected with a steam inlet of a steam-water separator, a circulating water outlet of the steam-water separator is connected with a water inlet of the steam generator through a recirculation water pipe, and the system comprises:
the steam sampling system is connected with a steam outlet of the steam-water separator; the steam sampling system comprises a steam sampling device, a condensing device and a condensed water collecting container which are sequentially connected through pipelines, wherein the steam sampling device is communicated with a steam outlet pipeline of a steam-water separator, and steam separated from the steam-water separator is condensed by the condensing device to become condensed water and is collected into the condensed water collecting container;
the recirculating water sampling system comprises a recirculating water sampling device, a cooling device and a cooling water collecting container which are sequentially connected through pipelines, wherein the recirculating water sampling device is communicated with the recirculating water pipe, and the recirculating water is cooled by the cooling device and then is collected into the cooling water collecting container;
the measuring system comprises a conductivity meter and an instrument control terminal which are electrically connected, wherein the conductivity meter is used for measuring the conductivity of condensed water in the condensed water collecting container and the conductivity of recirculated water in the cooling water collecting container respectively, the conductivity meter transmits measured data to the instrument control terminal, and the instrument control terminal processes the data to obtain steam humidity.
Preferably, a first stop valve and a first pressure reducing valve are sequentially arranged between the steam sampling device and the condensing device, a first electric regulating valve and a flowmeter are sequentially arranged between the condensing device and the condensed water collecting container, and a second electric regulating valve is arranged at the lower end of the condensed water collecting container;
a second stop valve and a second pressure reducing valve are sequentially arranged between the recirculating water sampling device and the cooling device, a third electric regulating valve is arranged between the cooling device and the cooling water collecting container, and a fourth electric regulating valve is also arranged at the lower end of the cooling water collecting container;
and the instrument control terminal is electrically connected with the first electric regulating valve, the second electric regulating valve, the flowmeter, the third electric regulating valve and the fourth electric regulating valve respectively.
Preferably, the flowmeter is a mass flowmeter.
Preferably, the steam sampling device comprises a sampling pipe and a pipe connecting seat, the pipe connecting seat is coaxially and fixedly sleeved on the sampling pipe, and the pipe connecting seat is fixed on the outer wall of a steam outlet pipeline of the steam-water separator;
one end of the sampling tube penetrates through the tube wall of the steam outlet pipeline and extends into the tube, and the end part of the sampling tube is wedge-shaped in the tube; the sampling tube faces the inflow direction of the steam, and the wedge-shaped end part is positioned on the central axis of the steam outlet pipeline.
Preferably, the recirculation water pipe is provided with an opening;
the recirculating water sampling device comprises a water taking pipe, the water taking pipe is connected to the opening, and the cooling device is communicated with the recirculating water pipe through the water taking pipe.
Preferably, the conductivity meter comprises a host, and a first path of measuring end and a second path of measuring end which are electrically connected with the host, and the host is electrically connected with the meter control terminal; the first path of measuring end comprises a first conductive electrode, a first conductive probe, a first temperature sensor and a first data collector, the first conductive electrode is fixed in the condensed water collecting container, the first conductive probe is fixedly connected with the first conductive electrode, and the first temperature sensor and the first data collector are both electrically connected with the host;
the second measuring end comprises a second conductance electrode, a second conductance probe, a second temperature sensor and a second data collector, the second conductance electrode is fixed in the cooling water collecting container, the second conductance probe is fixedly connected with the second conductance electrode, and the second temperature sensor and the second data collector are both electrically connected with the host.
Preferably, the condensing device and the cooling device are both serpentine tube type heat exchangers.
Preferably, the condensed water collecting container and the cooling water collecting container are both closed metal containers.
Preferably, the material of the condensed water collecting container and the cooling water collecting container is 304 stainless steel.
The embodiment also provides a method for online measuring steam humidity based on the conductivity method, which uses the system according to the above embodiment, and includes the following steps:
step one, adding potassium carbonate to the recirculated water before measurement;
step two, respectively measuring the conductivity of the condensed water of the steam separated by the steam-water separator and the conductivity of the recirculated water by a conductivity meter;
and step three, comparing the two conductivities by the instrument control terminal to obtain the steam humidity.
Preferably, in the second step, after the indication of the conductivity meter is stable, the measured steam humidity is consistent with the steam humidity in the steam outlet pipeline of the steam-water separator.
Preferably, in the step one, a relation curve of the conductivity and the concentration of the potassium carbonate aqueous solution is obtained through calibration;
in step three, the steam humidity is obtained by the following formula:
in the formula: mstThe wet steam mass flow rate is measured by a flow meter arranged in a steam outlet pipeline of the steam-water separator, wherein the unit of the wet steam mass flow rate is t/hThe flowmeter is electrically connected with the instrument control terminal;
Mmthe mass flow rate of the moisture carried by the steam, the unit is t/h, is measured by a flowmeter in a steam sampling system, and the flowmeter is electrically connected with an instrument control terminal;
Sfwthe concentration of the wet steam tracing element is in mg/kg, the conductivity is obtained by a conductivity meter, and the concentration is obtained according to a relation curve of the conductivity and the concentration;
Scthe concentration of the trace element of the recirculated water is in mg/kg, the conductivity is obtained by a conductivity meter, and the concentration is obtained according to a relation curve of the conductivity and the concentration;
omega steam humidity,%.
Compared with the prior art, the invention has the following technical effects:
1. the invention is suitable for high-temperature high-pressure steam humidity measurement places, can realize real-time online measurement of steam humidity, and has the advantages of simple measurement principle, easy realization of device processing technology and high measurement precision. The invention has simple principle and convenient operation, can carry out on-line measurement on the high-temperature and high-pressure steam humidity, and effectively improves the real-time property and the accuracy of the steam humidity measurement.
2. The invention designs the steam sampling device, which can ensure that the sampling tube is always in an upstream state and ensure constant-speed sampling of steam by a mass conservation method.
Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments 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 obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts. In the drawings:
FIG. 1 is a schematic diagram of a system for online measurement of steam humidity based on a conductivity method according to a preferred embodiment of the present invention;
fig. 2 is a schematic view of an installation structure of a vapor sampling device according to a preferred embodiment of the present invention.
Detailed Description
The present invention provides a system for on-line measuring steam humidity based on conductivity method, which will be described in detail with reference to fig. 1 to 2, and this embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments, and those skilled in the art can modify and color the present invention without changing the spirit and content of the present invention.
The steam outlet of the steam generator is connected with the steam inlet of the steam-water separator through a pipeline. In the steam-water separator, clean steam and condensed water for recycling are separated by the steam-water separator, so the condensed water is also called as circulating water, and the circulating water is discharged through a circulating water outlet (also called as a condensed water outlet) of the steam-water separator.
Referring to fig. 1, the present invention provides a system for online measuring steam humidity based on a conductivity method, the system comprising:
the steam sampling system 1 is connected with a steam outlet of the steam-water separator; the steam sampling system 1 comprises a steam sampling device 11, a condensing device 14 and a condensed water collecting container 17 which are sequentially connected through pipelines, wherein the steam sampling device 11 is used for sampling steam separated by a steam-water separator, namely the steam sampling device 11 is communicated with a steam outlet pipeline of the steam-water separator, and the steam is condensed by the condensing device 14 to become condensed water and is collected into the condensed water collecting container 17;
a recirculating water sampling system 2 connected to the recirculating water pipe, wherein the recirculating water sampling system 2 comprises a recirculating water sampling device 21, a cooling device 24 and a cooling water collecting container 26 which are sequentially connected through a pipeline, the recirculating water sampling device 21 is used for obtaining the recirculating water separated by the steam-water separator, namely the recirculating water sampling device 21 is communicated with the recirculating water pipe, and the recirculating water is cooled by the cooling device 24 and then collected into the cooling water collecting container 26;
a measuring system 3, comprising an electrical conductivity meter 31 and an instrument control terminal 32, said conductivity meter 31 being used for measuring the conductivity of the condensate in said condensate collecting vessel 17 and the conductivity of the recirculating water in said cooling water collecting vessel 26, respectively, said conductivity meter 31 delivering the measured data to said instrument control terminal 32, said instrument control terminal 32 processing the data to obtain the steam humidity.
Further, a first flowmeter is arranged in a steam outlet pipeline of the steam-water separator, a first stop valve 12 and a first pressure reducing valve 13 are sequentially arranged between the steam sampling device 11 and the condensing device 14, a first electric regulating valve 15 and a second flowmeter 16 are sequentially arranged between the condensing device 14 and a condensed water collecting container 17, and a second electric regulating valve 18 is further arranged at the lower end of the condensed water collecting container 17;
a second stop valve 22 and a second pressure reducing valve 23 are sequentially arranged between the recirculating water sampling device 21 and the cooling device 24, a third electric regulating valve 25 is arranged between the cooling device 24 and the cooling water collecting container 26, and a fourth electric regulating valve is further arranged at the lower end of the cooling water collecting container 26;
the instrumentation terminal 32 is electrically connected to the first electric control valve 15, the second electric control valve 18, the second flowmeter 16, the third electric control valve 25, and the fourth electric control valve 27, respectively.
The first pressure reducing valve 13 may reduce the pressure in the system to the operating pressure of the condensing device 14, and the second pressure reducing valve 23 may reduce the pressure in the system to the operating pressure of the cooling device 24.
Both the condensing unit 14 and the cooling unit 24 are serpentine tube heat exchangers.
The condensed water collecting container 17 and the cooling water collecting container 26 are both closed metal containers, and are preferably made of 304 stainless steel, so that air can be effectively isolated, and the influence of air on the electric conductivity of condensed water and cooling water is eliminated.
The first flowmeter and the second flowmeter 16 are preferably mass flowmeters, and whether the steam sampling has reached the constant sampling rate is determined by the readings of the flowmeters.
The instrument control terminal 32 includes a control processing unit and a display unit, such as a computer.
Referring to fig. 2, the steam sampling device 11 includes a sampling tube 111 and a connecting tube base 112, the connecting tube base 112 is coaxially and fixedly sleeved on the sampling tube 111, and the connecting tube base 112 is fixed on the outer wall of the steam outlet pipeline 4 of the steam-water separator;
one end of the sampling tube 111 penetrates through the tube wall of the steam outlet pipeline 4 and extends into the tube, and the end of the sampling tube 111 is wedge-shaped in the tube; the sampling pipe 111 faces the inflow direction of steam, and the wedge-shaped end part is positioned on the central axis of the steam outlet pipeline 4. The other end of the sampling pipe 111 is connected to the condensing unit 14 through a pipe on which the first stop valve 12 and the first pressure reducing valve 13 are provided.
In this embodiment, the vapor sampling device 11 is preferably a detachable structure.
In the embodiment, the recycling water pipe is provided with an opening, and the opening is formed in the pipe wall of the recycling water pipe; the recirculating water sampling device comprises a water taking pipe, the water taking pipe is coaxially fixed in a pipe sleeve, and the outer pipe wall of the pipe sleeve is hermetically connected with the inner side of the opening to prevent water from leaking; through which the cooling device 24 communicates with the recirculation water pipe.
In this embodiment, the conductivity meter 31 is a multi-range meter, the conductivity meter 31 includes a host, and a first path of measuring terminal and a second path of measuring terminal electrically connected to the host, and the host is electrically connected to the meter control terminal 32; the first path of measuring end comprises a first conductive electrode, a first conductive probe, a first temperature sensor and a first data collector, the first conductive electrode is fixed in the condensed water collecting container 17, the first conductive probe is fixedly connected with the first conductive electrode, and the first temperature sensor and the first data collector are both electrically connected with the host;
the second measuring end comprises a second conductance electrode, a second conductance probe, a second temperature sensor and a second data collector, the second conductance electrode is fixed in the cooling water collecting container 26, the second conductance probe is fixedly connected with the second conductance electrode, and the second temperature sensor and the second data collector are both electrically connected with the host.
The purpose of the temperature sensor is to be able to temperature compensate the conductivity of the solution. The magnitude of the conductivity is closely related to the dissociation degree of the electrolyte in water and the migration speed of the ions, which are related to the temperature of the solution. The conductivity of the solution increases with increasing temperature, and decreases vice versa. In order to overcome the influence of temperature and make the conductivities of different solutions at different temperatures have comparability, when measuring the conductivity, it is accepted that 25 ℃ is used as a reference temperature, and when the temperature of the solution is not 25 ℃, temperature compensation is carried out to compensate the conductivity at 25 ℃.
The measurement principle of the system is as follows:
the conductivity of the potassium carbonate aqueous solution has a certain proportional relation with the concentration of potassium carbonate in the solution, and a relation curve of the conductivity and the concentration can be obtained through calibration; in addition, under an ideal state, pure steam is condensed to be pure water, the conductivity is almost zero, but under an actual working condition, the steam carries a certain amount of liquid drops containing conductive substances to flow downstream, so that condensed water formed after the steam is condensed has a certain conductivity. Therefore, a certain amount of potassium carbonate was added to the recirculated water before the measurement, and the concentration S of potassium carbonate in the recirculated water was obtained by calculationcThen, the concentration S of potassium carbonate in the wet steam is obtained by measuring the conductivity of the sampled steam condensate waterfwThe steam humidity is obtained by the following formula:
in the formula: mstThe mass flow of the wet steam is measured by a first flowmeter arranged in a steam outlet pipeline of the steam-water separator, and the first flowmeter is electrically connected with an instrument control terminal 32, wherein the unit of the mass flow of the wet steam is t/h;
Mmthe mass flow rate of the moisture carried by the steam, which is measured by a second flowmeter in the steam sampling system 1 and is electrically connected with the instrument control terminal 32, is t/h;
Sfwthe concentration of the wet steam tracer element is in mg/kg, the conductivity is obtained by a conductivity meter 31, and the concentration is obtained according to a relation curve of the conductivity and the concentration;
Scthe concentration of the trace elements of the recirculated water is in mg/kg, the conductivity is obtained by a conductivity meter 31, and the concentration is obtained according to a relation curve of the conductivity and the concentration;
omega steam humidity,%.
A method for on-line measuring steam humidity based on a conductivity method uses the system, and comprises the following steps:
the method comprises the following steps of firstly, obtaining a relational expression of the conductivity and the mass concentration of a potassium carbonate aqueous solution through calibration;
secondly, adding a certain mass of potassium carbonate into the recycled water, and controlling the concentration of the potassium carbonate in the water to be an allowable value;
step three, adjusting the first stop valve 12 and the second reducing valve 23 to adjust the inlet pressure of the condensing device 14 to the working pressure of the condensing device 14;
the flow of the condensed water of the condensing device 14 is adjusted to ensure that the steam entering the steam sampling system 1 is completely condensed to the condensed water close to the normal temperature;
the first electric regulating valve 15 and the second electric regulating valve 18 are regulated by observing the reading of the second flowmeter 16, the flow rate of steam in the sampling pipe 111 for taking steam is ensured to be consistent with the flow rate of steam in a steam outlet pipeline of the steam-water separator, and meanwhile, the liquid level in the condensed water collecting container 17 is stable and submerges the first conductive electrode;
adjusting the second stop valve 22 and the second pressure reducing valve 23 to adjust the inlet pressure of the cooling device 24 to the working pressure of the cooling device 24;
adjusting the flow rate of the cooling water of the cooling device 24 to ensure that the recirculating water entering the recirculating water sampling system 2 is completely cooled to water close to normal temperature;
adjusting a third electric adjusting valve 25 and a fourth electric adjusting valve 27 to ensure that the recirculated water slowly flows into a cooling water collecting container 26, and the liquid level is stable and submerges the second conductive electrode;
step four, after the readings of the conductivity meter 31 are stable, the water replacement in the condensed water collecting container 17 and the cooling water collecting container 26 is finished, and the measured steam humidity is consistent with the steam humidity in the main steam pipeline;
step five, the instrument control terminal 32 processes the conductivity of the steam condensate and the recirculating water measured by the conductivity meter 31 to obtain the steam humidity omega
In the formula: mstThe mass flow of the wet steam is measured by a first flowmeter arranged in a steam outlet pipeline of the steam-water separator, and the first flowmeter is electrically connected with an instrument control terminal 32, wherein the unit of the mass flow of the wet steam is t/h;
Mmthe mass flow rate of the moisture carried by the steam, which is measured by a second flow meter 16 in the steam sampling system 1, is t/h, and the second flow meter 16 is electrically connected with an instrument control terminal 32;
Sfwthe concentration of the wet steam tracer element is in mg/kg, the conductivity is obtained by a conductivity meter 31, and the concentration is obtained according to a relation curve of the conductivity and the concentration;
Scthe concentration of the trace elements of the recirculated water is in mg/kg, the conductivity is obtained by a conductivity meter 31, and the concentration is obtained according to a relation curve of the conductivity and the concentration;
omega steam humidity,%.
The disclosure above is only one specific embodiment of the present application, but the present application is not limited thereto, and any variations that can be made by those skilled in the art are intended to fall within the scope of the present application.
Claims (12)
1. The utility model provides a system for on-line measurement steam humidity based on conductivity method, steam generator's steam outlet and catch water's steam inlet are connected, and catch water's circulating water export is connected with steam generator's water inlet through recirculation pipe, its characterized in that, the system includes:
the steam sampling system is connected with a steam outlet of the steam-water separator; the steam sampling system comprises a steam sampling device, a condensing device and a condensed water collecting container which are sequentially connected through pipelines, wherein the steam sampling device is communicated with a steam outlet pipeline of a steam-water separator, and steam separated from the steam-water separator is condensed by the condensing device to become condensed water and is collected into the condensed water collecting container;
the recirculating water sampling system comprises a recirculating water sampling device, a cooling device and a cooling water collecting container which are sequentially connected through pipelines, wherein the recirculating water sampling device is communicated with the recirculating water pipe, and the recirculating water is cooled by the cooling device and then is collected into the cooling water collecting container;
the measuring system comprises a conductivity meter and an instrument control terminal which are electrically connected, wherein the conductivity meter is used for measuring the conductivity of condensed water in the condensed water collecting container and the conductivity of recirculated water in the cooling water collecting container respectively, the conductivity meter transmits measured data to the instrument control terminal, and the instrument control terminal processes the data to obtain steam humidity.
2. The system for on-line measurement of steam humidity based on conductivity method as claimed in claim 1, wherein a first stop valve and a first pressure reducing valve are sequentially disposed between the steam sampling device and the condensing device, a first electric control valve and a flow meter are sequentially disposed between the condensing device and the condensed water collecting container, and a second electric control valve is disposed at the lower end of the condensed water collecting container;
a second stop valve and a second pressure reducing valve are sequentially arranged between the recirculating water sampling device and the cooling device, a third electric regulating valve is arranged between the cooling device and the cooling water collecting container, and a fourth electric regulating valve is also arranged at the lower end of the cooling water collecting container;
and the instrument control terminal is electrically connected with the first electric regulating valve, the second electric regulating valve, the flowmeter, the third electric regulating valve and the fourth electric regulating valve respectively.
3. The system for on-line measurement of steam humidity based on conductivity method of claim 2, wherein the flow meter is a mass flow meter.
4. The system for on-line measurement of steam humidity based on the conductivity method as claimed in claim 1, wherein the steam sampling device comprises a sampling tube and a pipe connecting seat, the pipe connecting seat is coaxially and fixedly sleeved on the sampling tube, and the pipe connecting seat is fixed on the outer wall of the steam outlet pipeline of the steam-water separator;
one end of the sampling tube penetrates through the tube wall of the steam outlet pipeline and extends into the tube, and the end part of the sampling tube is wedge-shaped in the tube; the sampling tube faces the inflow direction of the steam, and the wedge-shaped end part is positioned on the central axis of the steam outlet pipeline.
5. The system for on-line measurement of steam humidity based on conductivity method of claim 1, wherein the recirculation water pipe is provided with an opening;
the recirculating water sampling device comprises a water taking pipe, the water taking pipe is connected to the opening, and the cooling device is communicated with the recirculating water pipe through the water taking pipe.
6. The system for on-line measurement of steam humidity based on conductivity method as claimed in claim 1, wherein said conductivity meter comprises a host machine and a first path of measuring terminal and a second path of measuring terminal electrically connected with the host machine, said host machine is electrically connected with said meter control terminal; the first path of measuring end comprises a first conductive electrode, a first conductive probe, a first temperature sensor and a first data collector, the first conductive electrode is fixed in the condensed water collecting container, the first conductive probe is fixedly connected with the first conductive electrode, and the first temperature sensor and the first data collector are both electrically connected with the host;
the second measuring end comprises a second conductance electrode, a second conductance probe, a second temperature sensor and a second data collector, the second conductance electrode is fixed in the cooling water collecting container, the second conductance probe is fixedly connected with the second conductance electrode, and the second temperature sensor and the second data collector are both electrically connected with the host.
7. The system for on-line measurement of steam humidity based on conductivity method of claim 1, wherein the condensing means and the cooling means are coiled heat exchangers.
8. The system for on-line measurement of steam humidity based on conductivity method of claim 1, wherein the condensed water collecting container and the cooling water collecting container are sealed metal containers.
9. The system for on-line measurement of steam humidity based on conductivity method of claim 8, wherein the condensed water collection container and the cooling water collection container are made of 304 stainless steel.
10. A method for on-line measurement of steam humidity based on conductivity method, using the system of claim 1, comprising the steps of:
step one, adding potassium carbonate to the recirculated water before measurement;
step two, respectively measuring the conductivity of the condensed water of the steam separated by the steam-water separator and the conductivity of the recirculated water by a conductivity meter;
and step three, comparing the two conductivities by the instrument control terminal to obtain the steam humidity.
11. The method for on-line measurement of steam humidity based on conductivity method according to claim 10, wherein in step two, after the conductivity meter reading is stabilized, the measured steam humidity is consistent with the steam humidity in the steam outlet pipe of the steam-water separator.
12. The method for on-line measurement of steam humidity based on the conductivity method as claimed in claim 11, wherein in step one, the conductivity-concentration relation curve of the potassium carbonate aqueous solution is obtained by calibration;
in step three, the steam humidity is obtained by the following formula:
in the formula: mstThe mass flow of the wet steam is measured by a flowmeter arranged in a steam outlet pipeline of the steam-water separator, and the flowmeter is electrically connected with an instrument control terminal;
Mmthe mass flow rate of the moisture carried by the steam, the unit is t/h, is measured by a flowmeter in a steam sampling system, and the flowmeter is electrically connected with an instrument control terminal;
Sfwthe concentration of the wet steam tracing element is in mg/kg, the conductivity is obtained by a conductivity meter, and the concentration is obtained according to a relation curve of the conductivity and the concentration;
Scthe concentration of the trace element of the recirculated water is in mg/kg, the conductivity is obtained by a conductivity meter, and the concentration is obtained according to a relation curve of the conductivity and the concentration;
omega steam humidity,%.
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| DE69516274T2 (en) * | 1994-12-29 | 2000-08-31 | Tokin Corp | HUMIDITY SENSOR |
| JP5811406B2 (en) * | 2012-04-24 | 2015-11-11 | 清水建設株式会社 | Humidity measuring device and humidity measuring method |
| DE102016212986A1 (en) * | 2016-07-15 | 2018-01-18 | Volkswagen Aktiengesellschaft | Liquid measuring device and measuring head device for moisture detection, in particular in containers for liquid-sensitive electrical and / or electronic components in road vehicles |
| CN108267479A (en) * | 2016-12-30 | 2018-07-10 | 核动力运行研究所 | A kind of online steam wetness measurement system |
| CN208383170U (en) * | 2018-05-10 | 2019-01-15 | 洛阳中科龙网创新科技有限公司 | The device of on-line real-time measuremen agricultural land soil temperature humidity and conductivity |
| CN110057873B (en) * | 2019-04-24 | 2021-05-28 | 重庆科技学院 | High-temperature high-pressure steam dryness online monitoring system and method |
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