CN114324798A - Calibration system and calibration method for oil-in-water analyzer - Google Patents
Calibration system and calibration method for oil-in-water analyzer Download PDFInfo
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- CN114324798A CN114324798A CN202111631529.XA CN202111631529A CN114324798A CN 114324798 A CN114324798 A CN 114324798A CN 202111631529 A CN202111631529 A CN 202111631529A CN 114324798 A CN114324798 A CN 114324798A
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Abstract
The invention provides a calibration system and a calibration method of an oil-in-water analyzer, wherein the calibration system comprises the oil-in-water analyzer, a three-way valve, a circulating pump, a controller, a zero water tank, a first standard sample water tank, a second standard sample water tank and a drain valve, wherein the first end of the three-way valve is connected with an outlet of a superheater, the second end of the three-way valve is connected with the first end of the oil-in-water analyzer, and the second end of the oil-in-water analyzer is connected with the drain valve; the third end of the three-way valve is connected with the circulating pump, and the controller is connected with the circulating pump; an inlet valve of the zero water tank is connected with the second end of the in-water oil analyzer, and an outlet valve of the zero water tank is connected with the circulating pump; an inlet valve of the first standard sample water tank is connected with the second end of the in-water oil analyzer, and an outlet valve of the first standard sample water tank is connected with the circulating pump; and the inlet valve of the second standard sample water tank is connected with the second end of the in-water oil analyzer, and the outlet valve of the second standard sample water tank is connected with the circulating pump. The technical scheme of the invention can conveniently and automatically calibrate the oil-in-water analyzer.
Description
Technical Field
The invention relates to the technical field of photo-thermal power stations, in particular to a system and a method for calibrating an oil analyzer in water.
Background
At present, the groove type photo-thermal power station widely uses heat transfer oil as a heat transfer medium. Specifically, the feed water generates high-temperature and high-pressure steam through the main and reheating two-column 3-level oil-water heat exchangers to push a steam turbine generator unit to generate electricity. The oil-water heat exchanger is used as main heat exchange equipment, the structure is complex, the operation working condition changes frequently, various stresses exist on metal parts of the oil-water heat exchanger, metal welding seams of the oil-water heat exchanger are cracked or broken due to the existence of the stresses, and heat conduction oil possibly leaks into water and steam for a long time, so that the heat conduction oil enters a steam turbine. Because the density of the heat conduction oil is far greater than that of the water vapor, the heat conduction oil can cause fatal damage to the turbine blades rotating at high speed after entering the turbine, so that the two rows of outlet steam of the main heat exchanger and the reheat heat exchanger are sampled to monitor the oil in the water, the heat conduction oil entering the turbine can be timely and effectively found out when slight leakage occurs, and the damage to important equipment caused by the expansion of accidents is avoided. And (4) carrying out pressure reduction cooling on high-temperature and high-pressure water vapor at the outlets of the superheater and the reheater, and sending the cooled water sample into a heat conducting oil analyzer for monitoring. Because no heat conducting oil exists in the water sample under normal conditions, the data of the analyzer is zero for a long time, and certain paralysis and misjudgment can be caused to operation and maintenance personnel; in another situation, during startup and shutdown, zero drift occurs in the measured data of the analyzer, resulting in inaccurate monitored data.
Disclosure of Invention
The invention provides a calibration system and a calibration method for an oil-in-water analyzer, which can be used for conveniently and automatically calibrating the oil-in-water analyzer, improving the accuracy of monitoring data of the oil-in-water analyzer and ensuring the normal operation of the system.
The invention provides a calibration system of an oil-in-water analyzer, which comprises the oil-in-water analyzer, a three-way valve, a circulating pump, a controller, a zero water tank, a first standard sample water tank, a second standard sample water tank and a drain valve,
a first end of the three-way valve is connected with an outlet of the superheater, a second end of the three-way valve is connected with a first end of the oil-in-water analyzer, and a second end of the oil-in-water analyzer is connected with the drain valve;
the third end of the three-way valve is connected with the circulating pump, and the controller is connected with the circulating pump;
an inlet valve of the zero water tank is connected with the second end of the in-water oil analyzer, and an outlet valve of the zero water tank is connected with the circulating pump;
an inlet valve of the first standard sample water tank is connected with the second end of the in-water oil analyzer, and an outlet valve of the first standard sample water tank is connected with the circulating pump;
and the inlet valve of the second standard sample water tank is connected with the second end of the in-water oil analyzer, and the outlet valve of the second standard sample water tank is connected with the circulating pump.
Further, the calibration system also comprises a flowmeter and a filter,
the flowmeter and the filter are sequentially arranged between the circulating pump and the third end of the three-way valve.
Further, the capacity of the zero water tank, the capacity of the first standard sample water tank and the capacity of the second standard sample water tank are the same.
Furthermore, the water sample in the zero-point water tank does not contain heat conduction oil, and the first concentration of the mixed liquid containing the heat conduction oil in the first standard sample water tank is greater than the second concentration of the mixed liquid containing the heat conduction oil in the second standard sample water tank.
Further, the circulating pump is a variable frequency magnetic circulating pump.
Further, the inlet valve and the outlet valve of the zero water tank, the inlet valve and the outlet valve of the first standard water tank, and the inlet valve and the outlet valve of the second standard water tank are all solenoid valves.
In order to achieve the above object, the present invention further provides a calibration method for an oil-in-water analyzer, the calibration method being implemented based on the calibration system for an oil-in-water analyzer described in the embodiment of the first aspect, and the calibration method includes:
and opening an inlet valve and an outlet valve of the zero water tank, starting the circulating pump and the in-water oil analyzer, and carrying out zero calibration on the in-water oil analyzer according to a first numerical value detected by the in-water oil analyzer.
Further, the method further comprises:
and closing the inlet valve and the outlet valve of the zero water tank, opening the inlet valve and the outlet valve of the first standard water tank, and calibrating the in-water oil analyzer according to the second numerical value detected by the in-water oil analyzer.
Further, the method further comprises:
and closing the inlet valve and the outlet valve of the first standard sample water tank, opening the inlet valve and the outlet valve of the second standard sample water tank, and calibrating the in-water oil analyzer according to a third numerical value detected by the in-water oil analyzer.
Further, the oil-in-water analyzer is calibrated when zero drift occurs, or is calibrated in a periodic manner.
By applying the technical scheme of the invention, the in-water oil analyzer can be conveniently and automatically calibrated, the accuracy of the monitoring data of the in-water oil analyzer is improved, and the normal operation of the system is ensured.
Drawings
The above and other objects, features and advantages of exemplary embodiments of the present invention will become readily apparent from the following detailed description read in conjunction with the accompanying drawings. Several embodiments of the present disclosure are illustrated by way of example, and not by way of limitation, in the figures of the accompanying drawings and in which like reference numerals refer to similar or corresponding parts and in which:
FIG. 1 is a schematic structural diagram of a calibration system of an oil-in-water analyzer according to a first embodiment;
fig. 2 shows a flowchart of a calibration method of the oil-in-water analyzer according to the first embodiment.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may also be oriented 90 degrees or at other orientations and the spatially relative descriptors used herein interpreted accordingly.
Exemplary embodiments according to the present invention will now be described in more detail with reference to the accompanying drawings. These exemplary embodiments may, however, be embodied in many different forms and should not be construed as limited to only the embodiments set forth herein. It is to be understood that these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art, in the drawings, the thicknesses of layers and regions are exaggerated for clarity, and the same devices are denoted by the same reference numerals, and thus the description thereof will be omitted.
As shown in fig. 1, the calibration system for an oil-in-water analyzer according to the first embodiment includes an oil-in-water analyzer 100, a three-way valve 200, a circulation pump 300, a controller 400, a zero water tank 500, a first standard water tank 600, a second standard water tank 700, and a drain valve 800.
A first end of the three-way valve 200 is connected to the superheater outlet 900, a second end of the three-way valve 200 is connected to a first end of the oil-in-water analyzer 100, and a second end of the oil-in-water analyzer 100 is connected to the drain valve 800.
The third end of the three-way valve 200 is connected to the circulation pump 300, and the controller 400 is connected to the circulation pump 300.
The inlet valve 501 of the zero water tank 500 is connected to the second end of the in-water oil analyzer 100, and the outlet valve 502 of the zero water tank 500 is connected to the circulation pump 300.
The inlet valve 601 of the first sample tank 600 is connected to the second end of the in-water oil analyzer 100, and the outlet valve 602 of the first sample tank 600 is connected to the circulation pump 300.
The inlet valve 701 of the second sample tank 700 is connected to the second end of the in-water oil analyzer 100, and the outlet valve 702 of the second sample tank 700 is connected to the circulation pump 300.
Wherein, the circulating pump 300 is a variable frequency magnetic circulating pump. The inlet valve 501 and the outlet valve 502 of the zero water tank 500, the inlet valve 601 and the outlet valve 602 of the first standard water tank 600, and the inlet valve 701 and the outlet valve 702 of the second standard water tank 700 are solenoid valves.
In one embodiment, the zero water tank 500, the first standard water tank 600 and the second standard water tank 700 have the same capacity. The water sample in the zero water tank 500 does not contain heat transfer oil, and the first concentration of the mixed liquid containing the heat transfer oil in the first standard sample water tank 600 is greater than the second concentration of the mixed liquid containing the heat transfer oil in the second standard sample water tank 600.
In another embodiment, the calibration system further comprises a flow meter 310 and a filter 320.
The flow meter 310 and the filter 320 are sequentially disposed between the circulation pump 300 and the third end of the three-way valve 200.
Under the normal monitoring condition, steam at the superheater outlet 900 forms a condensed water sample after being subjected to temperature reduction and pressure reduction, then is sent to the in-water oil analyzer 100 through the three-way valve 200 for data monitoring and analysis, and the analyzed water sample is discharged through the drain valve 800. However, in a long-term situation, the oil-in-water analyzer 100 cannot guarantee that the monitored data always keeps accurate, and therefore calibration work needs to be performed on the data. Through adjusting the state of three-way valve 200, insert zero water tank 500 with aquatic oil analysis appearance 100 in proper order first standard sample water tank 600 and in the different return circuits of second standard sample water tank 700, mark aquatic oil analysis appearance 100 to guarantee aquatic oil analysis appearance monitoring data's accuracy, and then guarantee system normal operating.
The calibration device for the oil-in-water analyzer provided by the embodiment of the invention can be used for conveniently and automatically calibrating the oil-in-water analyzer, so that the accuracy of monitoring data of the oil-in-water analyzer is improved, and the normal operation of a system is ensured.
In order to achieve the purpose, the invention further provides a calibration method of the oil-in-water analyzer.
As shown in fig. 2, the calibration method of the oil-in-water analyzer in the embodiment of the present invention includes the following steps:
and S1, opening an inlet valve and an outlet valve of the zero water tank, starting the circulating pump and the in-water oil analyzer, and carrying out zero calibration on the in-water oil analyzer according to a first numerical value detected by the in-water oil analyzer.
For example, the controller sequentially opens an outlet valve and an inlet valve of the zero water tank, switches the three-way valve, starts the circulating pump to circulate the standard sample of the zero water tank, and judges whether the oil analyzer in water is normal or not according to the measured data of the oil analyzer in water. Under normal conditions, the water sample in the zero-point water tank does not contain heat conduction oil, so the value monitored by the oil analyzer in normal water should be zero. If the numerical value is not zero, zero calibration needs to be carried out on the oil analyzer in water, so that the oil analyzer in water is kept accurate.
And S2, closing the inlet valve and the outlet valve of the zero water tank, opening the inlet valve and the outlet valve of the first standard water tank, and calibrating the in-water oil analyzer according to the second numerical value detected by the in-water oil analyzer.
After the circulation with the zero water tank standard sample is finished, the circulation loop of the first standard sample water tank can be accessed. Assuming that the ppm concentration of the heat transfer oil in the first standard water tank is 20, the value monitored by the normal oil-in-water analyzer should be 20. If the value is not 20, the oil-in-water analyzer needs to be calibrated to keep it accurate.
And S3, closing the inlet valve and the outlet valve of the first standard sample water tank, opening the inlet valve and the outlet valve of the second standard sample water tank, and calibrating the in-water oil analyzer according to a third value detected by the in-water oil analyzer.
After the standard sample is circulated with the first standard sample water tank, the circulation loop of the second standard sample water tank can be accessed. Assuming that the ppm concentration of the heat transfer oil in the second standard water tank is 10, the value monitored by the normal oil-in-water analyzer should be 10. If the value is not 10, the oil-in-water analyzer needs to be calibrated to keep it accurate.
In one embodiment, there are two scenarios for calibrating an oil-in-water analyzer: firstly, calibrating an oil analyzer in water when zero drift occurs; and calibrating the oil-in-water analyzer in a periodic manner, such as at weekly intervals.
The following description is given with reference to a specific embodiment.
The water tanks with the capacity of 3 25 liters are used, water samples with different concentrations are proportioned according to requirements, the water sample in the zero water tank does not contain heat conduction oil, the PPM concentration of the water sample in the first standard water tank is 20, the PPM concentration of the water sample in the second standard water tank is 10, and the water level of each standard water tank is kept above 3/4. Water sample circulation is carried out through the variable-frequency magnetic circulating pump, and the flow and the starting and stopping of the circulating pump are controlled through the controller. The 3 cistern inlet and outlet valves are controlled by means of solenoid valves.
Firstly, opening an outlet valve and an inlet valve of a zero water tank, starting a circulating pump, adjusting the flow to 800ml/min, and opening an oil analyzer in water for circulating analysis. And starting timing after the measured value is stable, and switching to the first standard sample water tank for measurement after a certain time requirement is met. And closing the outlet valve and the inlet valve of the zero-point water tank, and opening the outlet valve and the inlet valve of the first standard sample water tank to maintain the flow of 800 ml/min. And starting timing when the measured value is close to the first standard sample concentration value, and switching to a second standard sample water tank for measurement after a certain time requirement is met. And closing the outlet valve and the inlet valve of the first standard sample water tank, and opening the outlet valve and the inlet valve of the second standard sample water tank to maintain the flow of 800 ml/min. And starting timing when the measured value is close to the second standard sample concentration value, and finishing the data acquisition process after a certain time requirement is met. And stopping the circulating system, starting the drain valve, and switching the three-way valve to a normal monitoring water sample. The collected data are subjected to graphical representation, and graphical comparison analysis is performed on the standard sample data of different grades and the actual measurement data of the analyzer, so that the working state of the oil-in-water analyzer can be effectively judged in time, and the oil-in-water analyzer is calibrated.
According to the calibration method of the oil-in-water analyzer, the correctness of the measured data of the oil-in-water analyzer is verified through automatic switching of different standard samples, the oil-in-water analyzer is conveniently and automatically calibrated, the accuracy of the monitored data of the oil-in-water analyzer is improved, and the normal operation of a system is guaranteed.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A calibration system of an oil-in-water analyzer is characterized by comprising the oil-in-water analyzer, a three-way valve, a circulating pump, a controller, a zero water tank, a first standard sample water tank, a second standard sample water tank and a drain valve,
a first end of the three-way valve is connected with an outlet of the superheater, a second end of the three-way valve is connected with a first end of the oil-in-water analyzer, and a second end of the oil-in-water analyzer is connected with the drain valve;
the third end of the three-way valve is connected with the circulating pump, and the controller is connected with the circulating pump;
an inlet valve of the zero water tank is connected with the second end of the in-water oil analyzer, and an outlet valve of the zero water tank is connected with the circulating pump;
an inlet valve of the first standard sample water tank is connected with the second end of the in-water oil analyzer, and an outlet valve of the first standard sample water tank is connected with the circulating pump;
and the inlet valve of the second standard sample water tank is connected with the second end of the in-water oil analyzer, and the outlet valve of the second standard sample water tank is connected with the circulating pump.
2. The calibration system as recited in claim 1, further comprising a flow meter and a filter,
the flowmeter and the filter are sequentially arranged between the circulating pump and the third end of the three-way valve.
3. The calibration system as set forth in claim 1, wherein the zero water tank, the first standard water tank, and the second standard water tank have the same capacity.
4. The calibration system according to claim 1, wherein the water sample in the zero-point water tank does not contain heat transfer oil, and a first concentration of the mixed liquid containing heat transfer oil in the first standard sample water tank is greater than a second concentration of the mixed liquid containing heat transfer oil in the second standard sample water tank.
5. The calibration system as recited in claim 1, wherein the circulation pump is a variable frequency magnetic circulation pump.
6. The calibration system as set forth in claim 1, wherein said inlet and outlet valves of said zero water tank, said first sample water tank, and said second sample water tank are solenoid operated valves.
7. A calibration method for an oil-in-water analyzer, which is implemented based on the calibration system for an oil-in-water analyzer of any one of claims 1 to 6, and which comprises the following steps:
and opening an inlet valve and an outlet valve of the zero water tank, starting the circulating pump and the in-water oil analyzer, and carrying out zero calibration on the in-water oil analyzer according to a first numerical value detected by the in-water oil analyzer.
8. The calibration method according to claim 7, characterized in that the method further comprises:
and closing the inlet valve and the outlet valve of the zero water tank, opening the inlet valve and the outlet valve of the first standard water tank, and calibrating the in-water oil analyzer according to the second numerical value detected by the in-water oil analyzer.
9. The calibration method according to claim 7, characterized in that the method further comprises:
and closing the inlet valve and the outlet valve of the first standard sample water tank, opening the inlet valve and the outlet valve of the second standard sample water tank, and calibrating the in-water oil analyzer according to a third numerical value detected by the in-water oil analyzer.
10. Calibration method according to claim 7, characterized in that the oil-in-water analyzer is calibrated when a zero drift occurs or in a periodic fashion.
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| CN211553973U (en) * | 2020-02-24 | 2020-09-22 | 北京万维盈创科技发展有限公司 | Standard liquid checking quality control instrument |
| CN213933820U (en) * | 2020-11-19 | 2021-08-10 | 北京万维盈创科技发展有限公司 | Multifunctional water quality monitoring remote quality control instrument |
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2021
- 2021-12-28 CN CN202111631529.XA patent/CN114324798A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103149250A (en) * | 2013-03-04 | 2013-06-12 | 李熔 | Online total organic carbon water quality analyzer and online total organic carbon water quality analyzing method |
| CN109444383A (en) * | 2018-11-09 | 2019-03-08 | 大港油田集团有限责任公司 | A kind of bearing analysis instrument on-line continuous calibration system |
| CN211553973U (en) * | 2020-02-24 | 2020-09-22 | 北京万维盈创科技发展有限公司 | Standard liquid checking quality control instrument |
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