CN104614054A - Method for verifying boiler drum water level or differential pressure measurement accuracy - Google Patents
Method for verifying boiler drum water level or differential pressure measurement accuracy Download PDFInfo
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- CN104614054A CN104614054A CN201510073196.1A CN201510073196A CN104614054A CN 104614054 A CN104614054 A CN 104614054A CN 201510073196 A CN201510073196 A CN 201510073196A CN 104614054 A CN104614054 A CN 104614054A
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- drum
- differential pressure
- water level
- boiler
- unit
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Abstract
The invention discloses a method for verifying boiler drum water level or differential pressure measurement accuracy. The method is characterized by including: acquiring relevant parameters; according to the relevant parameters, calculating water level in a drum so as to acquire calculated value of the water level in the drum; comparing measured value of the water level in the drum with the calculated value so as to verify the measurement accuracy of the water level of the boiler drum.
Description
Technical field
The present invention relates to thermal control field, particularly, relate to a kind of method verifying boiler drum level or differential pressure measurement accuracy.
Background technology
Adopt single-compartment balance container join differential pressure transmitter measure the mode of boiler drum level apply by most of thermal power plant, during installation, debugging, configuration or when certain link of system breaks down, need to verify with detection failure link to measurement device result, and existing method needs to analyze through numerous and diverse calculating, not only holding time is more but also easily make mistakes.
Summary of the invention
The object of this invention is to provide a kind of method verifying boiler drum level or differential pressure measurement accuracy, the method just can verify the accuracy of boiler drum level or differential pressure measurement through shirtsleeve operation, for system debug, fault analysis provide conveniently.
To achieve these goals, the invention provides a kind of method verifying boiler drum water level measurement accuracy, it is characterized in that, the method comprises: obtain correlation parameter; According to described correlation parameter, calculate water level in drum, to obtain the calculated value of water level in drum; And the measured value of water level and described calculated value in contrast drum, to verify the accuracy of boiler drum water level measurement.
Correspondingly, the present invention also provides a kind of method verifying boiler-steam dome differential pressure measurement accuracy, and it is characterized in that, the method comprises: obtain correlation parameter; According to described correlation parameter, calculate differential pressure in drum, to obtain the calculated value of differential pressure in drum; And the measured value of differential pressure and described calculated value in contrast drum, to verify the accuracy of boiler-steam dome differential pressure measurement.
By technique scheme, result of calculation and measurement result are contrasted, quick and precisely can verify the accuracy of level measuring in boiler-steam dome, for the debugging of system, fault analysis provide conveniently.
Other features and advantages of the present invention are described in detail in embodiment part subsequently.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for instructions, is used from explanation the present invention, but is not construed as limiting the invention with embodiment one below.In the accompanying drawings:
Fig. 1 shows the schematic diagram that mode that single-compartment balance container joins differential pressure transmitter measures boiler drum level;
Fig. 2 shows the method flow diagram of checking boiler drum water level measurement accuracy provided by the invention; And
Fig. 3 shows the method flow diagram of checking boiler-steam dome differential pressure measurement accuracy provided by the invention.
Description of reference numerals
1 boiler-steam dome 2 single-compartment balance container
3 differential pressure transmitter 4 DCS dish cabinets
5 DCS man-machine interfaces
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.Should be understood that, embodiment described herein, only for instruction and explanation of the present invention, is not limited to the present invention.
Fig. 1 shows the schematic diagram that mode that single-compartment balance container joins differential pressure transmitter measures boiler drum level.As shown in Figure 1, the device that the mode that single-compartment balance container joins differential pressure transmitter measures steam water-level comprises: single-compartment balance container 2, differential pressure transmitter 3, DCS dish cabinet 4 and DCS man-machine interface.Its principle is, boiler-steam dome 1 middle and lower part is saturation water, and top is saturated vapour, and the temperature in boiler-steam dome 1, pressure, water level change at any time.The outside of boiler-steam dome 1 is for measuring the coagulation of single-compartment balance container 2 due to steam of water level, full water can be coagulated in single-compartment balance container 2 inside, the water surface of single-compartment balance container 2 inside can remain on sustained height with the lower edge of inlet tube, in single-compartment balance container 2 container, the height of water is constant, the internal pressure that the temperature of water equals environment temperature, pressure equals boiler-steam dome 1.The current signal that the differential pressure signal recorded changes 4 ~ 20mA into is passed to DCS by differential pressure transmitter, and DCS finally realizes Measurement accuracy and the display of boiler-steam dome 1 water level by compensation calculation.DCS man-machine interface 5 is for showing water level in boiler-steam dome 1 and differential pressure.
The mode of joining differential pressure transmitter according to single-compartment balance container measures the principle of steam water-level, can show that in drum, water level computing formula is:
SW
0=(((L* (ρ
1-ρ
3) * g-Δ P*9.80665)/((ρ
2-ρ
3) * g)-(L-D) * 1000 (1) wherein SW
0represent water level calculated value in described drum, unit is mm, and Δ P is the measurement differential pressure that differential pressure transmitter 3 records, and unit is mmH
2o; L is the vertical range in single-compartment balance container 2 under the water surface to drum level measurement pipeline between leading point, and unit is m; D be in single-compartment balance container 2 water surface to the vertical range of zero level line, unit m; ρ
1for the density of water in single-compartment balance container 2, unit is kg/m
3; ρ
2for saturated water density in boiler-steam dome 1, unit is kg/m
3; ρ
3for saturated vapor density in boiler-steam dome 1, unit is kg/m
3; G is acceleration of gravity, and unit is m/s
2, be on-site actual value.Wherein Δ P*9.80665 be in order to by the unit of differential pressure Δ P by mmH
2o is scaled Pa.
Wherein, certain position within 200mm below boiler-steam dome 1 geometric center lines or geometric center lines is defined as zero level reference point (according to boiler factory's design) in generating plant practical application, during higher than zero level line, DCS man-machine interface 5 shows boiler-steam dome 1 measure water level value SW on the occasion of, during lower than zero level line, DCS man-machine interface 5 showing boiler-steam dome 1, to measure water level value SW be negative value.
Fig. 2 shows the method flow diagram of checking boiler drum water level measurement accuracy provided by the invention.As shown in Figure 2, correlation parameter (S21) is first obtained.
Wherein, Δ P is measured by differential pressure transmitter 3 and show acquisition in DCS man-machine interface.In addition, the differential pressure Δ P of the boiler-steam dome 1 recorded by differential pressure transmitter 3 can also be had access to out by using manual operator to be connected with differential pressure transmitter 3.。
Wherein, in formula (1), ρ
1, ρ
2, ρ
3three parameters by looking into density meter, using density Automatic inquirying software or utilize the modes such as density calculation formula (as vapour density can adopt formula 1/ [(0.00471* temperature+1.286)/(10.2* pressure+1)-0.0097+1.32* temperature/100000] to calculate) to obtain, but can be not limited to this according to pressure, temperature.Wherein table look-up or use the data arrived of density calculation software relatively more accurate, the data using formulae discovery to obtain have some deviations, therefore, should use in actual use as far as possible and table look-up or use density calculation software, thus ensure the accuracy of result of calculation.
Wherein, in formula (1), in the vertical range L in single-compartment balance container 2 under the water surface to drum level measurement pipeline between leading point and single-compartment balance container 2 water surface to the vertical range D of zero level line by actual measurement gained.Gravity acceleration g is location A/W acceleration.
Secondly, according to the correlation parameter (S22) obtained, water level calculated value SW in boiler-steam dome 1 can be calculated in conjunction with formula (1)
0, contrast this calculated value SW
0water level measurements SW (S23) in the boiler-steam dome 1 shown with DCS man-machine interface.Conveniently can verify the accuracy of water level measurements in boiler-steam dome 1.
According to the method for checking boiler drum water level measurement accuracy provided by the invention, after acquisition correlation parameter, can use automatic software for calculation in conjunction with formula (1), such as EXCEL, inputs correlation parameter in software, automatically to calculate result.
Correspondingly, can show that in boiler-steam dome 1, differential pressure computing formula is:
ΔP
0＝(L*ρ
1*g-(L-D+SW/1000)*ρ
2*g+(SW/1000-D)*ρ
3*g)*0.102 (2)
Wherein, Δ P
0for differential pressure calculated value in boiler-steam dome 1, unit is mmH
2o; SW is the water level measurements in the boiler-steam dome 1 of DCS man-machine interface display, the unit vertical range that to be mm, L be in single-compartment balance container 2 under the water surface to drum level measurement pipeline between leading point, and unit is m; D be in single-compartment balance container 2 water surface to the vertical range of zero level line, unit m; ρ
1for the density of water in single-compartment balance container 2, unit is kg/m
3; ρ
2for saturated water density in boiler-steam dome 1, unit is kg/m
3; ρ
3for saturated vapor density in boiler-steam dome 1, unit is kg/m
3; G is acceleration of gravity, and unit is m/s
2, be on-site actual value.The object being wherein multiplied by 0.102 is that unit is converted to mmH by Pa
2o.
Fig. 3 shows the method flow diagram of checking boiler-steam dome differential pressure measurement accuracy provided by the invention.As shown in Figure 3, first correlation parameter (S31) is obtained, the parameter that wherein correlation parameter is identical with formula (1) can be obtained by identical mode, and in addition, the water level measurements in the boiler-steam dome 1 that parameter SW can be shown by DCS man-machine interface obtains.Secondly, according to the correlation parameter obtained, differential pressure calculated value Δ P in boiler-steam dome 1 can be calculated in conjunction with formula (2)
0(S32) this calculated value Δ P, is contrasted
0with measured differential pressure measurement value Δ P (S33) obtained by differential pressure transmitter 3.Conveniently can verify the accuracy of differential pressure measured value in boiler-steam dome 1.
According to the method for checking boiler-steam dome differential pressure measurement accuracy provided by the invention, after acquisition correlation parameter, can use automatic software for calculation in conjunction with formula (2), such as EXCEL, inputs correlation parameter in software, automatically to calculate result.
The method of checking boiler drum water level measurement accuracy provided by the invention is used in boiler capital construction phase installment work and terminates, when DCS Logical Configuration completes, the manual operator of differential pressure transmitter 3 is connected with differential pressure transmitter 3, obtain the differential pressure that differential pressure transmitter 3 records, by in this differential pressure Input Software, the water level value obtained in software should be consistent with the water level value that DCS man-machine interface 5 shows, if inconsistent, will check electric loop, Signal transmissions, fastener, configuration.
The method of checking boiler-steam dome differential pressure measurement accuracy provided by the invention also can be used for the capital construction phase and terminates, after normally running a period of time, unallowed deviation is there is between the water level of display in DCS man-machine interface 5 and two-colour fluviograph or electric contact point fluviograph, at this moment can think that DCS configuration is correct, so obtain differential pressure by the water level value Input Software of display in DCS man-machine interface 5, then recall with manual operator the differential pressure value that differential pressure transmitter 3 records, if the two not etc., so will not check electric loop, Signal transmissions, fastener.If the two is equal, then can install differential pressure gauge or differential pressure transmitter and result of calculation in addition additional to compare, if the two is not etc., then illustrate that differential pressure transmitter 3 goes wrong, if the two still equal and fairlead and valve no problem, then substantially can illustrate that the water level that DCS records is accurately, problem should go out at two-colour fluviograph or electric contact point fluviograph.
Below the preferred embodiment of the present invention is described in detail by reference to the accompanying drawings; but; the present invention is not limited to the detail in above-mentioned embodiment; within the scope of technical conceive of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
It should be noted that in addition, each concrete technical characteristic described in above-mentioned embodiment, in reconcilable situation, can be combined by any suitable mode, in order to avoid unnecessary repetition, the present invention illustrates no longer separately to various possible array mode.
In addition, also can carry out combination in any between various different embodiment of the present invention, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (10)
1. verify a method for boiler drum water level measurement accuracy, it is characterized in that, the method comprises:
Obtain correlation parameter;
According to described correlation parameter, calculate water level in drum, to obtain the calculated value of water level in drum; And
Contrast the measured value of water level in drum and described calculated value, to verify the accuracy of boiler drum water level measurement.
2. method according to claim 1, is characterized in that, described correlation parameter comprises:
The measured value of water level in drum;
Differential pressure measurement value Δ P in drum;
Vertical range L in equalizing reservoir under the water surface to drum level measurement pipeline between leading point;
In equalizing reservoir, the water surface is to the vertical range D of zero level line;
The density p of water in equalizing reservoir
1;
Saturated water density ρ in drum
2;
Saturated vapor density ρ in drum
3;
Gravity acceleration g;
Wherein said parameter Δ P, measured by differential pressure transmitter and obtain, described parameter L, D are obtained by actual measurement, described parameter ρ
1, ρ
2, ρ
3according to the pressure in drum, in the outer equalizing reservoir of drum, the temperature of water is by looking into density meter, density Automatic inquirying software or utilizing the modes such as density calculation formula to obtain.
3. method according to claim 2, is characterized in that, calculate formulae discovery according to water level in drum and go out water level in drum, in described drum, water level computing formula is:
SW
0＝(((L*(ρ
1-ρ
3)*g-ΔP*9.80665)/((ρ
2-ρ
3)*g)-(L-D)*1000
Wherein SW
0represent water level calculated value in described drum, unit is mm, and Δ P unit is mmH
2o; L, D unit m; ρ
1, ρ
2, ρ
3, unit is kg/m
3; G unit is m/s
2.
Wherein Δ P*9.80665 be in order to by the unit of differential pressure measurement value Δ P by mmH
2o is scaled Pa.
4. method according to claim 2, is characterized in that, the mode adopting single-compartment balance container to join differential pressure transmitter measures the water level in boiler-steam dome, obtains the described measured value of water level in drum.
5. method according to claim 4, is characterized in that, in drum, the described measured value of water level is shown by DCS man-machine interface.
6. verify a method for boiler-steam dome differential pressure measurement accuracy, it is characterized in that, the method comprises:
Obtain correlation parameter;
According to described correlation parameter, calculate differential pressure in drum, to obtain the calculated value of differential pressure in drum; And
Contrast the measured value of differential pressure in drum and described calculated value, to verify the accuracy of boiler-steam dome differential pressure measurement.
7. method according to claim 6, is characterized in that, described parameter comprises:
The measured value of differential pressure in drum;
Water level measurements SW in drum;
Vertical range L in equalizing reservoir under the water surface to drum level measurement pipeline between leading point;
In equalizing reservoir, the water surface is to the vertical range D of zero level line;
The density p of water in equalizing reservoir
1;
Saturated water density ρ in drum
2;
Saturated vapor density ρ in drum
3;
Gravity acceleration g;
The mode that wherein said parameter SW adopts single-compartment balance container to join differential pressure transmitter measures the water level in boiler-steam dome, described parameter L, D are obtained by actual measurement, described parameter ρ
1, ρ
2, ρ
3according to the pressure in drum, in the outer equalizing reservoir of drum, the temperature of water is by looking into density meter, density Automatic inquirying software or utilizing the modes such as density calculation formula to obtain.
8. method according to claim 7, is characterized in that, calculate water level in drum according to differential pressure computing formula in drum, in described drum, differential pressure computing formula is:
ΔP
0＝(L*ρ
1*g-(L-D+SW/1000)*ρ
2*g+(SW/1000-D)*ρ
3*g)*0.102
Wherein, Δ P
0for differential pressure calculated value in described drum, unit is mmH
2o; SW unit is mm; L, D unit m; ρ
1, ρ
2, ρ
3, unit is kg/m
3; G unit is m/s
2.
The object being wherein multiplied by 0.102 is that unit is converted to mmH by Pa
2o.
9. method according to claim 7, is characterized in that, employing single-compartment balance container joins the differential pressure in differential pressure transmitter measurement boiler-steam dome, obtains the described measured value of differential pressure in drum.
10. method according to claim 9, is characterized in that, in drum, the described measured value of differential pressure is shown by DCS man-machine interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510073196.1A CN104614054A (en) | 2014-10-17 | 2015-02-11 | Method for verifying boiler drum water level or differential pressure measurement accuracy |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410553611.9A CN104330128A (en) | 2014-10-17 | 2014-10-17 | Method for verifying accuracy of boiler drum lever or differential pressure measurement |
| CN2014105536119 | 2014-10-17 | ||
| CN201510073196.1A CN104614054A (en) | 2014-10-17 | 2015-02-11 | Method for verifying boiler drum water level or differential pressure measurement accuracy |
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| CN104614054A true CN104614054A (en) | 2015-05-13 |
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|---|---|---|---|
| CN201410553611.9A Pending CN104330128A (en) | 2014-10-17 | 2014-10-17 | Method for verifying accuracy of boiler drum lever or differential pressure measurement |
| CN201510073196.1A Pending CN104614054A (en) | 2014-10-17 | 2015-02-11 | Method for verifying boiler drum water level or differential pressure measurement accuracy |
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| CN201410553611.9A Pending CN104330128A (en) | 2014-10-17 | 2014-10-17 | Method for verifying accuracy of boiler drum lever or differential pressure measurement |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108561875A (en) * | 2018-04-18 | 2018-09-21 | 国网天津市电力公司电力科学研究院 | The control method of boiler drum level in the case of paired running water pump |
| CN109147971A (en) * | 2018-08-14 | 2019-01-04 | 中广核核电运营有限公司 | The verification method of nuclear power plant's reactor core water level monitoring system |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107203225A (en) * | 2017-06-16 | 2017-09-26 | 中国神华能源股份有限公司 | Dum boiler startup stage the Water Level Control of Steam method and control system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108561875A (en) * | 2018-04-18 | 2018-09-21 | 国网天津市电力公司电力科学研究院 | The control method of boiler drum level in the case of paired running water pump |
| CN109147971A (en) * | 2018-08-14 | 2019-01-04 | 中广核核电运营有限公司 | The verification method of nuclear power plant's reactor core water level monitoring system |
| CN109147971B (en) * | 2018-08-14 | 2020-04-14 | 中广核核电运营有限公司 | Verification method of nuclear power plant reactor core water level monitoring system |
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| Publication number | Publication date |
|---|---|
| CN104330128A (en) | 2015-02-04 |
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Application publication date: 20150513 |