CN107477561A - Method, apparatus and storage medium for boiler vapor liquid level observing and controlling - Google Patents
Method, apparatus and storage medium for boiler vapor liquid level observing and controlling Download PDFInfo
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- CN107477561A CN107477561A CN201710651445.XA CN201710651445A CN107477561A CN 107477561 A CN107477561 A CN 107477561A CN 201710651445 A CN201710651445 A CN 201710651445A CN 107477561 A CN107477561 A CN 107477561A
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- Prior art keywords
- liquid level
- measured
- value
- differential pressure
- drum
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/78—Adaptations or mounting of level indicators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/42—Applications, arrangements, or dispositions of alarm or automatic safety devices
- F22B37/46—Applications, arrangements, or dispositions of alarm or automatic safety devices responsive to low or high water level, e.g. for checking, suppressing, extinguishing combustion in boilers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/14—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measurement of pressure
- G01F23/16—Indicating, recording, or alarm devices being actuated by mechanical or fluid means, e.g. using gas, mercury, or a diaphragm as transmitting element, or by a column of liquid
Abstract
The embodiment of the present invention provides a kind of method, apparatus and storage medium for boiler vapor liquid level observing and controlling, belongs to automatic field.The method for boiler vapor liquid level observing and controlling includes：The liquid level of the drum is measured by differential pressure levelmeter and second liquid level gauge, wherein the second liquid level gauge measures the liquid level of the drum using non-differential pressure principle；And if water is less than first threshold in the equalizing reservoir of the differential pressure levelmeter, the measured value using the level value measured by the second liquid level gauge as the liquid level of steam drum.Pass through above-mentioned technical proposal, liquid level of steam drum is measured instead of differential pressure levelmeter by second liquid level gauge during boiler startup, solved during startup in equalizing reservoir in the case of anhydrous or water shortage, the problem of differential pressure levelmeter measurement is inaccurate.
Description
Technical field
The present invention relates to automatic field, more particularly to a kind of method, apparatus for boiler vapor liquid level observing and controlling and
Storage medium.
Background technology
In the prior art, the liquid level of drum in boiler is typically measured by differential pressure levelmeter.Differential pressure levelmeter is profit
Liquid level of steam drum is measured with the principle for comparing water-column difference.It is using differential pressure levelmeter that liquid level of steam drum is corresponding during measurement
Water column caused by pressure compared with pressure caused by the water column as reference, be converted to according to the differential pressure value measured
The liquid level of drum.Comparing water column is formed by the water column of constant height in equalizing reservoir, and the datum mark compared is liquid level gauge water side draw
The center line in sample hole, because the height of comparing water column is to maintain constant, the pressure difference can measured is converted directly into drum liquid
Position.The height of comparing water column is exactly center line of the horizontal plane in differential pressure levelmeter equalizing reservoir to liquid level gauge water side thief hole,
After equalizing reservoir installation, the height of comparing water column is exactly a definite value, and is used for measuring differential pressure in differential pressure levelmeter
The maximum range of differential pressure transmitter should just be equal to the pressure corresponding to comparing water column height, and boiler cold-state initial start stage is due to nothing
Carbonated drink condenses, and can cause measurement inaccurate when anhydrous in differential pressure levelmeter equalizing reservoir, current solution mainly has two kinds：
Scheme one：Before startup during boiler water filling, manual priming is carried out to differential pressure levelmeter equalizing reservoir.Part differential pressure liquid level
Meter, does not possess manual priming's interface, can only take the method that the advance filling up water of boiler-steam dome discharges water again put down differential pressure levelmeter
Weighing apparatus container fills water.This scheme is the control strategy for having had at present on waste heat boiler application, but the program adds manually
Workload, if the method for taking filling up water to discharge water again, it also add desalination water loss.
Scheme two：Liquid level protection is exited in coal-burning boiler initial start stage, manually according to the instruction control of liquid level gauge on the spot
Liquid level, after boiler has certain pressure, steam is condensed into water in equalizing reservoir, and differential pressure levelmeter can recover normal work, then
Liquid level protection is thrown back, and can put into and automatically adjust.This scheme initial start stage manually controls entirely, it is impossible to realizes that overall process is controlled automatically
System, and indicated without distant place liquid level, boiler water shortage or full water accident may be caused, while also reduce the automatic rate of unit.
In both the above scheme, scheme one causes the waste of a large amount of demineralized waters and adds labor workload, and scheme two drops
The low automatic rate of unit.Differential pressure levelmeter measurement liquid level of steam drum is forbidden during two schemes not can solve boiler startup
The problem of.
The content of the invention
In order to solve the above-mentioned problems in the prior art, it is an object of the invention to provide one kind to be used for boiler-steam dome liquid
The method, apparatus and storage medium of position observing and controlling.
To achieve these goals, the embodiment of the present invention provides a kind of method for boiler vapor liquid level observing and controlling, described
Method includes：The liquid level of the drum is measured by differential pressure levelmeter and second liquid level gauge, wherein the second liquid level gauge uses
Non- differential pressure principle measures the liquid level of the drum；And if water is less than the first threshold in the equalizing reservoir of the differential pressure levelmeter
Value, the measured value using the level value measured by the second liquid level gauge as the liquid level of steam drum.
Preferably, the second liquid level gauge is magnetostriction liquidometer.
Preferably, methods described also includes：If reach preset time, and the differential pressure after the combustion engine igniting of the boiler
The deviation of the level value measured by level value and the second liquid level gauge measured by liquid level gauge within a preset range, then start by
Measured value of the level value as the liquid level of steam drum measured by the differential pressure levelmeter.
Preferably, methods described also includes：If reach preset time, and the differential pressure levelmeter after the combustion engine igniting
When the deviation of level value measured by measured level value and the second liquid level gauge is outside preset range, then alarm is sent.
Preferably, methods described also includes：After the alarm is sent, if the deviation enters in preset range,
Start the measured value using the level value measured by the differential pressure levelmeter as the liquid level of steam drum.
Preferably, methods described also include it is following at least one：If the pressure rise of the drum of the boiler is to default
The deviation of the level value measured by level value and the second liquid level gauge measured by pressure and the differential pressure levelmeter is default
In the range of when, then start the measured value using the level value measured by the differential pressure levelmeter as the liquid level of steam drum；If institute
The pressure for stating the drum of boiler is reduced to preset pressure and the level value measured by the differential pressure levelmeter and second liquid level
The deviation of the measured level value of meter within a preset range when, then start using the level value measured by the second liquid level gauge as
The measured value of the liquid level of steam drum.
Preferably, methods described also includes：If the pressure rise of the drum is reduced to preset pressure and the difference
When pressing the deviation of the level value measured by liquid level gauge and the level value measured by the second liquid level gauge outside preset range, send
Alarm.
Preferably, methods described also includes：After the alarm is sent during the pressure rise of drum, if the deviation
Into in preset range, then start the measured value using the level value measured by the differential pressure levelmeter as the liquid level of steam drum.
After sending the alarm between the pressure drop lowstand of drum, if the deviation enters in preset range, start described the
Measured value of the level value as the liquid level of steam drum measured by two liquid level gauges.
Preferably, methods described also includes：When being used as the drum liquid using the level value measured by the differential pressure levelmeter
During the measured value of position, the level value according to measured by the differential pressure levelmeter carries out liquid level protection；When with the second liquid level gauge
During measured value of the measured level value as the liquid level of steam drum, the liquid level protection is exited.
On the other hand, the embodiment of the present invention also provides a kind of device for boiler vapor liquid level observing and controlling, described device bag
Include：Differential pressure levelmeter, for measuring the liquid level of the boiler-steam dome；Second liquid level gauge, for using non-differential pressure principle measurement institute
State the liquid level of drum；And measure-controlling unit, in the equalizing reservoir of the differential pressure levelmeter water be less than the first threshold
During value, the measured value using the level value measured by the second liquid level gauge as the liquid level of steam drum.
Preferably, the second liquid level gauge is magnetostriction liquidometer.
Preferably, the measure-controlling unit is additionally operable to reach preset time, and institute after the combustion engine igniting of the boiler
When stating the deviation of the level value measured by differential pressure levelmeter and the level value measured by the second liquid level gauge within a preset range,
Start the measured value using the level value measured by the differential pressure levelmeter as the liquid level of steam drum.
Preferably, described device also includes：Alarm unit, for reaching preset time, and institute after combustion engine igniting
When stating the deviation of the level value measured by differential pressure levelmeter and the level value measured by the second liquid level gauge outside preset range,
Send alarm.
Preferably, the measure-controlling unit is additionally operable to after the alarm is sent, if the deviation enters default model
In enclosing, then start the measured value using the level value measured by the differential pressure levelmeter as the liquid level of steam drum.
Preferably, the measure-controlling unit be additionally operable to perform it is following one or more：When the pressure of the drum of the boiler
Power is increased to preset pressure and level value and the level value of second liquid level gauge measurement measured by the differential pressure levelmeter
Deviation within a preset range when, start the measured value using the level value that the differential pressure levelmeter measures as the liquid level of steam drum；
And when the pressure of the drum of the boiler be reduced to level value measured by preset pressure and the differential pressure levelmeter with it is described
The deviation of level value measured by second liquid level gauge within a preset range when, start the liquid level measured by by the second liquid level gauge
It is worth the measured value as the liquid level of steam drum.
Preferably, described device also includes：Alarm unit, for when the drum pressure rise or be reduced to default pressure
The deviation of the level value measured by level value and the second liquid level gauge measured by power and the differential pressure levelmeter is in default model
When enclosing outer, alarm is sent.
Preferably, the measure-controlling unit is additionally operable to：After the alarm is sent during the pressure rise of drum, if
The deviation enters in preset range, starts the survey using the level value measured by the differential pressure levelmeter as the liquid level of steam drum
Value；After sending the alarm between the pressure drop lowstand of drum, if the deviation enters in preset range, starting will be described
Measured value of the level value as the liquid level of steam drum measured by second liquid level gauge.
Preferably, described device also includes：Liquid level protection location, for the liquid level measured by with the differential pressure levelmeter
When being worth the measured value as the liquid level of steam drum, the level value according to measured by the differential pressure levelmeter carries out liquid level protection；When
During using the level value measured by the second liquid level gauge as the measured value of the liquid level of steam drum, the liquid level protection is exited.
The embodiment of the present invention also provides a kind of machinable medium, and finger is stored with the machinable medium
Order, the instruction are used to cause machine to perform above-mentioned method.
Pass through above-mentioned technical proposal, liquid level of steam drum is entered instead of differential pressure levelmeter by second liquid level gauge during boiler startup
Row measurement, solve during startup in equalizing reservoir in the case of anhydrous or water shortage, differential pressure levelmeter measurement is inaccurate to ask
Topic.
The further feature and advantage of the embodiment of the present invention will be described in detail in subsequent specific embodiment part.
Brief description of the drawings
Accompanying drawing is that the embodiment of the present invention is further understood for providing, and a part for constitution instruction, with
The embodiment in face is used to explain the embodiment of the present invention together, but does not form the limitation to the embodiment of the present invention.Attached
In figure：
Fig. 1 is a kind of block diagram of device for boiler vapor liquid level observing and controlling provided in an embodiment of the present invention；And
Fig. 2 is a kind of block diagram for device for boiler vapor liquid level observing and controlling that alternative embodiment of the present invention provides.
Description of reference numerals
The second liquid level gauge of 10 differential pressure levelmeter 20
The magnetostriction liquidometer of 30 measure-controlling unit 21
The liquid level protection location of 40 level control unit 50
60 alarm units
Embodiment
The embodiment of the embodiment of the present invention is described in detail below in conjunction with accompanying drawing.It should be appreciated that this
The embodiment of place description is merely to illustrate and explain the present invention embodiment, is not intended to limit the invention embodiment.
Embodiment one
In an embodiment of the present invention, there is provided a kind of method for boiler vapor liquid level observing and controlling, methods described bag
Include：The liquid level of the drum is measured by differential pressure levelmeter and second liquid level gauge, if water in the equalizing reservoir of differential pressure levelmeter
Amount is less than first threshold, the measured value using the level value measured by the second liquid level gauge as the liquid level of steam drum.
Wherein, second liquid level gauge measures the liquid level of the drum using non-differential pressure principle.The second liquid level gauge can be such as
It is magnetostriction liquidometer, radar type liquid-level gauge, magnetic turnover plate type liquid level gauge etc..At boiler startup initial stage, when differential pressure levelmeter is put down
When anhydrous or water is less than first threshold in weighing apparatus container, cause water-column in equalizing reservoir inadequate, differential pressure liquid is used so as to work as
During the meter measurement liquid level of steam drum of position, measuring result error is larger, causes differential pressure levelmeter can not normal work.Thus it will now pass through
Measured value of the level value as drum measured by second liquid level gauge, to reduce measurement error.
In an embodiment of the present invention, the boiler may, for example, be three discard heat boilers, and the drum can be high pressure
Drum, middle pressure drum or low-pressure drum.Also, first threshold depends on the capacity of differential pressure levelmeter equalizing reservoir, first threshold
Value can be equalizing reservoir close to water value during full water.
Pass through above-mentioned technical proposal, by replacing differential pressure levelmeter to drum liquid by second liquid level gauge during boiler startup
Position measures, and solves during startup in equalizing reservoir in the case of anhydrous or water shortage, differential pressure levelmeter measurement is inaccurate
The problem of.
Embodiment two
In a kind of alternative embodiment of the present invention, can respectively it be configured in HP steam drum, middle pressure drum and low-pressure drum a set of
Magnetostriction type liquid level gauge is used as second liquid level gauge, flat in differential pressure levelmeter (each drum can include three differential pressure levelmeters)
The container water column that weighs is too low so that differential pressure levelmeter works abnormal period, by the level value work of magnetostriction liquidometer output
For the measured value of liquid level of steam drum, the measured value can be used for automatically controlling for liquid level of steam drum.When the equalizing reservoir of differential pressure levelmeter
(make it that measured value is more accurate, the first threshold can be close to equalizing reservoir when interior water is more than or equal to first threshold
Water during full water), so as to differential pressure levelmeter measurement error when in the range of allowance, no-harass switch to differential pressure levelmeter.
Below by taking HP steam drum as an example, when measuring HP steam drum liquid level, comprise the following steps that：
Step S201, during generating set starts upper water, HP steam drum is by upper water sequence during water, differential pressure levelmeter
It is anhydrous in equalizing reservoir.Now, magnetostriction liquidometer is switched to by differential pressure levelmeter automatically, and surveyed according to magnetostriction liquidometer
The level value of amount is controlled to liquid level of steam drum, and liquid level protection automatically exits from.Shown automatically at feedwater pitch selection for magnetic
Flexible liquid level gauge is caused to remind operations staff.
Step S202, reach preset time after the combustion engine igniting of the boiler, and during three differential pressure levelmeters three take
Output level value and magnetostriction liquidometer output level value deviation within a preset range when, automatically switch to differential pressure
The level value that liquid level gauge measures is exported as the measured value of liquid level of steam drum, liquid level protection follow differential pressure levelmeter input and
Automatic synchronization is put into, and the level value measured according to differential pressure levelmeter carries out liquid level protection and/or Liquid level.Wherein, it is described
Deviation preset range may, for example, be within ± 50mm.The preset time can determine according to practical experience so that general
In the case of, when reaching the preset time after gas ignition, the water-column in equalizing reservoir meets the normal work of differential pressure levelmeter
The requirement of work, the preset time may, for example, be 600s.
Step S203, reach preset time after the combustion engine igniting of the boiler, and during three differential pressure levelmeters three take
The level value deviation of level value and the magnetostriction liquidometer output of output sends alarm when beyond preset range.The alarm
Indicate that two kinds of liquid level gauge measured deviations are excessive, be unsatisfactory for switching condition.So now automatically switch without liquid level gauge, can be by transporting
Administrative staff determines whether to carry out manual switching according to actual conditions, or until above-mentioned deviation is changed into preset range, carries out certainly
It is dynamic to switch and put into liquid level protection.
Correspondingly, middle pressure drum and low-pressure drum level measuring method and HP steam drum are similar.
Pass through above-mentioned technical proposal, differential pressure levelmeter is replaced to drum liquid by magnetostriction liquidometer during boiler startup
Position measures, and solves during startup in equalizing reservoir in the case of anhydrous or water shortage, differential pressure levelmeter measurement is inaccurate
The problem of.And whole-process automatic control can be carried out to boiler vapor liquid level, improve the reliability and hair of liquid level of steam drum control
The automatic rate of group of motors, while reduce the waste of demineralized water.
Embodiment three
In another alternative embodiment of the present invention, it is that the present embodiment is with drum pressure and liquid with the difference of embodiment two
Position deviation is as liquid level gauge switching condition.Below also by taking HP steam drum as an example, when measuring HP steam drum liquid level, specific steps are such as
Under：
Step 301, during generating set starts upper water, HP steam drum pressure gradually rises, when pressure is in preset pressure
When following, exported using the level value that magnetostriction liquidometer measures as the measured value of liquid level of steam drum, and according to the survey of the output
Value carries out liquid level of steam drum control, and liquid level protection automatically exits from.
Step 302, when HP steam drum pressure rises to preset pressure, and differential pressure levelmeter three takes the level value and magnetic of middle output
When causing the level value deviation of flexible liquid level gauge output within a preset range, the level value for measuring differential pressure levelmeter is automatically switched to
Measured value as liquid level of steam drum is exported, and liquid level protection follows the input of differential pressure levelmeter and automatic synchronization is put into, and root
The level value measured according to differential pressure levelmeter carries out liquid level protection and/or Liquid level.
Step 303, when HP steam drum pressure rises to preset pressure, and differential pressure levelmeter three takes the level value and magnetic of middle output
The level value deviation of flexible liquid level gauge output is caused to send alarm when beyond preset range.Two kinds of liquid level measurements of the police instruction
It is excessive to measure deviation, is unsatisfactory for switching condition.So now automatically switch without liquid level gauge, can be by operations staff according to actual feelings
Condition determines whether to carry out manual switching, or until above-mentioned deviation is changed into preset range, is automatically switched and puts into liquid level
Protection.
Step 304, during the decline of HP steam drum pressure, when pressure is reduced to preset pressure, and differential pressure levelmeter three
Take middle output level value and magnetostriction liquidometer output level value deviation within a preset range when, automatically switch to magnetic
The level value for causing flexible liquid level gauge to measure is exported as the measured value of liquid level of steam drum, and liquid level protection automatically exits from simultaneously.
Step 305, during the decline of HP steam drum pressure, when pressure is reduced to preset pressure, and differential pressure levelmeter three
The level value deviation that the level value of output and magnetostriction liquidometer export is taken to send alarm when beyond preset range.Should
Two kinds of liquid level gauge measured deviations of police instruction are excessive, are unsatisfactory for switching condition.So now automatically switch without liquid level gauge, can
Determine whether progress manual switching according to actual conditions by operations staff, or until above-mentioned deviation is changed into preset range, enter
Row automatically switches.Also, when switching to using the level value that magnetostriction liquidometer measures as during the measured value of liquid level of steam drum, liquid
Position protection automatically exits from simultaneously.
Step 306, when pressure is reduced to below preset pressure, while corresponding combustion engine is stopped working, automatically switch to magnetic
Cause measured value of the level value that flexible liquid level gauge measures as liquid level of steam drum.
Correspondingly, middle pressure drum and low-pressure drum level measuring method and HP steam drum are similar.But for it is middle pressure drum or
Person is in the case of other drum volumes are less, when carrying out liquid level gauge switching during measuring liquid level of steam drum, except considering vapour
Outside bag pressure and two kinds of liquid level gauge level imbalances, also need to consider the liquid level of steam drum value measured.Although i.e. pressure and level imbalance bar
Part reaches, but drum liquid level itself it is relatively low or it is higher can not switch liquid level gauge, with avoid switch liquid level gauge after because of liquid level too
High or too low chaotropic position protection value is too near.When liquid level gauge switching is therefore carried out in measurement process, the liquid of differential pressure levelmeter output
Place value should be in the range of alarming value, and the alarming value scope can be, for example, in the range of ± 250mm.
In the present embodiment, in the value Main Basiss drum pressure and equalizing reservoir of the preset pressure condensing capacity pair
It should be related to.So that in general, when drum pressure exceedes the preset pressure, condensate meets differential pressure liquid in equalizing reservoir
Position meter normal work requirement.For HP steam drum, the preset pressure may, for example, be 1.5MPa, and for middle pressure drum, this is default
Pressure may, for example, be 0.5MPa, and for low-pressure drum, the preset pressure may, for example, be 0.1MPa.For HP steam drum, in
It can be ± 50mm to press drum and low-pressure drum, the deviation preset range.
Pass through above-mentioned technical proposal, the method provided according to embodiments of the present invention, it can be used in generating set initial start stage
Magnetostriction liquidometer replaces differential pressure levelmeter realization to automatically control, and treats that boiler-steam dome possesses certain pressure, and judge differential pressure liquid
Position meter can be to be switched to differential pressure levelmeter control after working properly again, and puts into liquid level of steam drum protection, had both improved unit peace
Quan Xing, automatic rate, and demineralized water is saved to greatest extent, boiler-steam dome whole process liquid automatic control is realized, in safeguards system
On the premise of safety, the energy has been saved.
Example IV
Fig. 1 is a kind of block diagram of device for boiler vapor liquid level observing and controlling provided in an embodiment of the present invention.Such as Fig. 1 institutes
Show, in an embodiment of the present invention, also provide a kind of device for boiler vapor liquid level observing and controlling, described device includes：Difference
Liquid level gauge 10 is pressed, for measuring the liquid level of boiler-steam dome；Second liquid level gauge 20, for the liquid using non-differential pressure principle measurement drum
Position；And measure-controlling unit 30, for when water is less than first threshold in the equalizing reservoir of differential pressure levelmeter 10, by second
Measured value of the level value as liquid level of steam drum measured by liquid level gauge 20.
Wherein, second liquid level gauge 20 may, for example, be magnetostriction liquidometer, radar type liquid-level gauge, magnetic turnover plate type liquid level gauge
Deng.At boiler startup initial stage, when anhydrous or water is less than first threshold in the equalizing reservoir of differential pressure levelmeter 10, cause to balance
Water-column is inadequate in container, so as to which when measuring liquid level of steam drum using differential pressure levelmeter 10, measuring result error is larger.Thus
The measured value of drum will be now used as by the level value measured by second liquid level gauge 20, to reduce measurement error.
It should be noted that above-mentioned drum can be HP steam drum, middle pressure drum or low-pressure drum.Also, first threshold
Depending on the capacity of the equalizing reservoir of differential pressure levelmeter 10, the first threshold can be close to water during equalizing reservoir full water
Value.
Pass through above-mentioned technical proposal, differential pressure levelmeter 10 is replaced to drum liquid by second liquid level gauge 20 during boiler startup
Position measures, and solves during startup in equalizing reservoir in the case of anhydrous or water shortage, differential pressure levelmeter 10 measures not
The problem of quasi-.
Embodiment five
Fig. 2 is a kind of block diagram for device for boiler vapor liquid level observing and controlling that alternative embodiment of the present invention provides.Such as Fig. 2
Shown, in a kind of alternative embodiment of the present invention, the device for boiler vapor liquid level observing and controlling includes differential pressure levelmeter 10, and second
Liquid level gauge 20, measure-controlling unit 30, level control unit 40, liquid level protection location 50 and alarm unit 60.Wherein, it is described
Differential pressure levelmeter 10 and second liquid level gauge 20 are used for the liquid level for measuring drum, and the level value measured is exported to correlation unit.
The second liquid level gauge 20 can be magnetostriction liquidometer 21.The magnetostriction liquidometer 21 can be configured at HP steam drum,
Middle pressure drum and low-pressure drum, in differential pressure levelmeter 10 (each drum can include three differential pressure levelmeters 10) equalizing reservoir water
Post is too low so that differential pressure levelmeter 10 works abnormal period, and measure-controlling unit 30 exports magnetostriction liquidometer 21
Measured value of the level value as liquid level of steam drum, level control unit 40 controlled automatically according to the measured value to liquid level of steam drum
System.When water is more than or equal to first threshold in the equalizing reservoir of differential pressure levelmeter 10 (make it that measured value is more accurate, should
First threshold can be close to water during equalizing reservoir full water) so that model of the measurement error of differential pressure levelmeter 10 in allowance
When enclosing interior, no-harass switch to differential pressure levelmeter.Below by taking HP steam drum as an example, the course of work of the device is illustrated.
For HP steam drum, in generating set startup during water, HP steam drum by upper water sequence during water,
It is anhydrous in the equalizing reservoir of differential pressure levelmeter 10.Now, magnetic is switched to by differential pressure levelmeter 10 by measure-controlling unit 30 automatically
Flexible liquid level gauge 21 is caused, the level value that level control unit 40 measures according to magnetostriction liquidometer 21 is controlled to liquid level of steam drum
System, liquid level protection location 50 automatically exit from liquid level protection.Shown automatically at feedwater pitch selection for magnetostriction liquidometer
Remind operations staff.
Measure-controlling unit 30 is additionally operable to reach preset time after the combustion engine igniting of the boiler, to three differential pressure liquid levels
Count the level value that 10 3 level values for taking middle output and magnetostriction liquidometer 21 export to be compared, when two kinds of liquid level gauges measure
Level value deviation preset range in when, the liquid that differential pressure levelmeter 10 is measured is automatically switched to by measure-controlling unit 30
Measured value of the place value as liquid level of steam drum, liquid level protection location 50 follows the input of differential pressure levelmeter 10 and automatic synchronization is put into.
The level value that liquid level protection location 50 and/or level control unit 40 measure according to differential pressure levelmeter 10 carry out liquid level protection and/
Or Liquid level.Wherein, the deviation preset range may, for example, be within ± 50mm.The preset time can be according to practice
It is empirically determined so that in general, when reaching the preset time after gas ignition, the water-column in equalizing reservoir expires
The requirement of sufficient differential pressure levelmeter normal work, the preset time may, for example, be 600s.
The measure-controlling unit 30 is additionally operable to reach preset time after the combustion engine igniting of the boiler, to three differential pressures
The level value that liquid level gauge 10 3 takes the level value of middle output and magnetostriction liquidometer 21 to export is compared, when two kinds of liquid level gauges
For the deviation of the level value of measurement when beyond preset range, notice alarm unit 60 sends alarm.Two kinds of liquid levels of the police instruction
It is excessive to count measured deviation, is unsatisfactory for switching condition.So now automatically switch without liquid level gauge, can be by operations staff according to reality
Border situation determines whether progress manual switching, or until above-mentioned deviation is changed into preset range, then pass through measure-controlling unit
30 progress liquid level gauge automatic switchovers simultaneously put into liquid level protection.
Correspondingly, the device for boiler vapor liquid level observing and controlling can be used for middle pressure drum and low-pressure drum.
Pass through above-mentioned technical proposal, differential pressure levelmeter 10 is replaced to vapour by magnetostriction liquidometer 21 during boiler startup
Bag liquid level measures, and solves during startup in equalizing reservoir in the case of anhydrous or water shortage, differential pressure levelmeter 10 is surveyed
The problem of amount is inaccurate.And whole-process automatic control can be carried out to boiler vapor liquid level, improve the reliable of liquid level of steam drum control
Property and the automatic rate of generating set, while reduce the waste of demineralized water.
Embodiment six
In another alternative embodiment of the present invention, the device for boiler vapor liquid level observing and controlling includes differential pressure levelmeter 10,
Second liquid level gauge 20, measure-controlling unit 30, level control unit 40, liquid level protection location 50 and alarm unit 60.Wherein,
The differential pressure levelmeter 10 and second liquid level gauge 20 are used for the liquid level for measuring drum, and the level value measured is exported to related single
Member.Second liquid level gauge 20 is magnetostriction liquidometer 21 in the present embodiment.The present embodiment and the difference of embodiment five be, this
Measure-controlling unit 30 in embodiment is used as liquid level gauge switching condition using drum pressure and level imbalance.Below also with high pressure vapour
Exemplified by bag, the course of work of the device is illustrated.
During generating set starts upper water, HP steam drum pressure gradually rises.Measure-controlling unit 30 is used to work as pressure
When below preset pressure, the measured value using the level value that magnetostriction liquidometer 21 measures as liquid level of steam drum.Liquid level
Unit 40 carries out liquid level of steam drum control according to the measured value, and liquid level protection location 50 automatically exits from liquid level protection.
Measure-controlling unit 30 is additionally operable to when HP steam drum pressure rises to preset pressure, and differential pressure levelmeter 10 3 take in it is defeated
Go out level value and magnetostriction liquidometer 21 output level value deviation within a preset range when, differential pressure levelmeter 10 is measured
Measured value of the level value as liquid level of steam drum.Liquid level protection location 50 follows the input of differential pressure levelmeter and automatic synchronization is thrown
Enter.The level value that liquid level protection location 50 and/or level control unit 40 measure according to differential pressure levelmeter 10 carries out liquid level protection
And/or Liquid level.
Measure-controlling unit 30 is additionally operable to when HP steam drum pressure rises to preset pressure, and differential pressure levelmeter 10 3 take in it is defeated
The level value deviation of level value and magnetostriction liquidometer 21 output gone out when beyond preset range, send out by notice alarm unit 60
Go out alarm.Two kinds of liquid level gauge measured deviations of the police instruction are excessive, are unsatisfactory for switching condition.So without liquid level gauge certainly now
Dynamic switching, progress manual switching can be determined whether according to actual conditions by operations staff, or when above-mentioned deviation is changed into default model
When enclosing interior, liquid level gauge automatic switchover is carried out by measure-controlling unit 30 and puts into liquid level protecting.
Measure-controlling unit 30 is additionally operable to during HP steam drum pressure declines, when pressure is reduced to preset pressure, and
Differential pressure levelmeter 10 3 take middle output level value and magnetostriction liquidometer 21 export level value deviation within a preset range
When, automatically switch to and exported the level value that magnetostriction liquidometer 21 measures as the measured value of liquid level of steam drum.Liquid level
Protection location 50 automatically exits from liquid level protection simultaneously.
Measure-controlling unit 30 is additionally operable to during HP steam drum pressure declines, when pressure is reduced to preset pressure, and
Differential pressure levelmeter 10 3 take middle output level value and magnetostriction liquidometer 21 export level value deviation preset range with
When outer, notice alarm unit 60 sends alarm.Two kinds of liquid level gauge measured deviations of the police instruction are excessive, are unsatisfactory for switching condition.
So now automatically switching without liquid level gauge, progress manual switching can be determined whether according to actual conditions by operations staff, or
Until above-mentioned deviation is changed into preset range, liquid level gauge automatic switchover is carried out by measure-controlling unit 30.Also, when switching
To using the level value that magnetostriction liquidometer 21 measures as during the measured value of liquid level of steam drum, liquid level protection location 50 is simultaneously automatic
Exit liquid level protection.
Measure-controlling unit 30 is additionally operable to when pressure is reduced to below preset pressure, while corresponding combustion engine is stopped working, from
The dynamic measured value being switched to using the level value that magnetostriction liquidometer 21 measures as liquid level of steam drum.
Correspondingly, the device can be used for middle pressure drum and low-pressure drum.But for middle pressure drum or when other vapour
In the case of containing product is less, when carrying out liquid level gauge switching, in addition to considering drum pressure and two kinds of liquid level gauge level imbalances,
Also need to consider the liquid level of steam drum value measured.Although i.e. pressure and level imbalance condition reaches, drum liquid level itself it is relatively low or
It is higher to switch liquid level gauge, with avoid switch liquid level gauge after because liquid level is too high or too low chaotropic position protection value is too near.Therefore
When liquid level gauge switching is carried out in measurement process, the level value that differential pressure levelmeter 10 exports should be in the range of alarming value, the alarm
It can be, for example, in the range of ± 250mm to be worth scope.
In the present embodiment, in the value Main Basiss drum pressure and equalizing reservoir of the preset pressure condensing capacity pair
It should be related to.So that in general, when drum pressure exceedes the preset pressure, condensate meets differential pressure liquid in equalizing reservoir
Position meter normal work requirement.For HP steam drum, the preset pressure may, for example, be 1.5MPa, and for middle pressure drum, this is default
Pressure may, for example, be 0.5MPa, and for low-pressure drum, the preset pressure may, for example, be 0.1MPa.For HP steam drum, in
It can be ± 50mm to press drum and low-pressure drum, the deviation preset range.
Pass through above-mentioned technical proposal, the device provided according to embodiments of the present invention, it can be used in generating set initial start stage
Magnetostriction liquidometer 21 replaces the realization of differential pressure levelmeter 10 to automatically control, and treats that boiler-steam dome possesses certain pressure, and judgement is poor
Pressure liquid level gauge 10 can be controlled with being switched to differential pressure levelmeter 10 again after working properly, and put into liquid level of steam drum protection, both be improved
Unit safety, automatic rate, and demineralized water is saved to greatest extent, realize boiler-steam dome whole process liquid automatic control,
On the premise of safeguards system safety, the energy has been saved.
Correspondingly, the embodiment of the present invention also provides a kind of machinable medium, is deposited on the machinable medium
Instruction is contained, the instruction can for example be used for so that machine is performed described in above-described embodiment one, embodiment two and embodiment three
Method.
The optional embodiment of the embodiment of the present invention is described in detail above in association with accompanying drawing, still, the embodiment of the present invention is simultaneously
The detail being not limited in above-mentioned embodiment, can be to of the invention real in the range of the technology design of the embodiment of the present invention
The technical scheme for applying example carries out a variety of simple variants, and these simple variants belong to the protection domain of the embodiment of the present invention.
It is further to note that each particular technique feature described in above-mentioned embodiment, in not lance
In the case of shield, it can be combined by any suitable means.In order to avoid unnecessary repetition, the embodiment of the present invention pair
Various combinations of possible ways no longer separately illustrate.
It will be appreciated by those skilled in the art that realize that all or part of step in above-described embodiment method is to pass through
Program instructs the hardware of correlation to complete, and the program storage is in the storage medium, including some instructions are causing one
Individual or multiple machines (can be single-chip microcomputer, chip etc.) or processor (processor) are performed described in each embodiment of the application
The all or part of step of method.And foregoing storage medium includes：USB flash disk, mobile hard disk, read-only storage (ROM, Read-
Only Memory), random access memory (RAM, Random Access Memory), magnetic disc or CD etc. are various can be with
The medium of store program codes.
In addition, it can also be combined between a variety of embodiments of the embodiment of the present invention, as long as it is not
The thought of the embodiment of the present invention is run counter to, it should equally be considered as disclosure of that of the embodiment of the present invention.
Claims (19)
- A kind of 1. method for boiler vapor liquid level observing and controlling, it is characterised in that methods described includes：The liquid level of the drum is measured by differential pressure levelmeter and second liquid level gauge, wherein the second liquid level gauge uses non-differential pressure Principle measures the liquid level of the drum；AndIf water is less than first threshold in the equalizing reservoir of the differential pressure levelmeter, by the liquid measured by the second liquid level gauge Measured value of the place value as the liquid level of steam drum.
- 2. according to the method for claim 1, it is characterised in that the second liquid level gauge is magnetostriction liquidometer.
- 3. according to the method for claim 1, it is characterised in that methods described also includes：If reach preset time after the combustion engine igniting of the boiler, and the level value measured by the differential pressure levelmeter with it is described The deviation of level value measured by second liquid level gauge within a preset range, then starts the liquid level measured by by the differential pressure levelmeter It is worth the measured value as the liquid level of steam drum.
- 4. the method according to claim 1 or 3, it is characterised in that methods described also includes：If reach preset time after the combustion engine igniting, and the level value measured by the differential pressure levelmeter and second liquid When the deviation of the measured level value of position meter is outside preset range, then alarm is sent.
- 5. according to the method for claim 4, it is characterised in that methods described also includes：After the alarm is sent, if the deviation enters in preset range, start measured by the differential pressure levelmeter Measured value of the level value as the liquid level of steam drum.
- 6. according to the method for claim 1, it is characterised in that methods described also include it is following at least one：If level value and institute measured by the pressure rise of the drum of the boiler to preset pressure and the differential pressure levelmeter When stating the deviation of the level value measured by second liquid level gauge within a preset range, then start measured by the differential pressure levelmeter Measured value of the level value as the liquid level of steam drum；If the pressure of the drum of the boiler is reduced to preset pressure and the level value measured by the differential pressure levelmeter and institute When stating the deviation of the level value measured by second liquid level gauge within a preset range, then start measured by the second liquid level gauge Measured value of the level value as the liquid level of steam drum.
- 7. the method according to claim 1 or 6, it is characterised in that methods described also includes：If the pressure rise of the drum is reduced to preset pressure and the level value measured by the differential pressure levelmeter and institute When stating the deviation of the level value measured by second liquid level gauge outside preset range, alarm is sent.
- 8. according to the method for claim 7, it is characterised in that methods described also includes：After the alarm is sent during the pressure rise of drum, if the deviation enters in preset range, start institute State measured value of the level value as the liquid level of steam drum measured by differential pressure levelmeter.After sending the alarm between the pressure drop lowstand of drum, if the deviation enters in preset range, start institute State measured value of the level value as the liquid level of steam drum measured by second liquid level gauge.
- 9. according to the method described in any one claim in claim 3 or 6, it is characterised in that methods described also includes：When the measured value using the level value measured by the differential pressure levelmeter as the liquid level of steam drum, according to the differential pressure liquid Meter measured level value in position carries out liquid level protection；When the measured value using the level value measured by the second liquid level gauge as the liquid level of steam drum, exit the liquid level and protect Shield.
- 10. a kind of device for boiler vapor liquid level observing and controlling, it is characterised in that described device includes：Differential pressure levelmeter, for measuring the liquid level of the boiler-steam dome；Second liquid level gauge, for measuring the liquid level of the drum using non-differential pressure principle；AndMeasure-controlling unit, for when water is less than first threshold in the equalizing reservoir of the differential pressure levelmeter, by described Measured value of the level value as the liquid level of steam drum measured by two liquid level gauges.
- 11. device according to claim 10, it is characterised in that the second liquid level gauge is magnetostriction liquidometer.
- 12. device according to claim 10, it is characterised in thatThe measure-controlling unit is additionally operable to reach preset time, and the differential pressure levelmeter after the combustion engine igniting of the boiler The deviation of level value measured by measured level value and the second liquid level gauge within a preset range when, start the difference Press measured value of the level value measured by liquid level gauge as the liquid level of steam drum.
- 13. the device according to claim 10 or 12, it is characterised in that described device also includes：Alarm unit, for reaching preset time, and the level value measured by the differential pressure levelmeter after combustion engine igniting And when the deviation of the level value measured by the second liquid level gauge is outside preset range, send alarm.
- 14. device according to claim 13, it is characterised in thatThe measure-controlling unit is additionally operable to after the alarm is sent, if the deviation enters in preset range, is started Measured value using the level value measured by the differential pressure levelmeter as the liquid level of steam drum.
- 15. device according to claim 10, it is characterised in that the measure-controlling unit is additionally operable to perform following one Or more persons：When the level value measured by the pressure rise to preset pressure and the differential pressure levelmeter of the drum of the boiler with it is described The deviation of the level value of second liquid level gauge measurement within a preset range when, the level value for starting to measure the differential pressure levelmeter is made For the measured value of the liquid level of steam drum；AndWhen the pressure of the drum of the boiler be reduced to level value measured by preset pressure and the differential pressure levelmeter with it is described The deviation of level value measured by second liquid level gauge within a preset range when, start the liquid level measured by by the second liquid level gauge It is worth the measured value as the liquid level of steam drum.
- 16. the device according to claim 10 or 15, it is characterised in that described device also includes：Alarm unit, for when the drum pressure rise or be reduced to measured by preset pressure and the differential pressure levelmeter When the deviation of level value measured by level value and the second liquid level gauge is outside preset range, alarm is sent.
- 17. device according to claim 16, it is characterised in that the measure-controlling unit is additionally operable to：After the alarm is sent during the pressure rise of drum, if the deviation enters in preset range, starting will be described Measured value of the level value as the liquid level of steam drum measured by differential pressure levelmeter；After sending the alarm between the pressure drop lowstand of drum, if the deviation enters in preset range, starting will be described Measured value of the level value as the liquid level of steam drum measured by second liquid level gauge.
- 18. the device according to claim 12 or 15, it is characterised in that described device also includes：Liquid level protection location, for when the measured value using the level value measured by the differential pressure levelmeter as the liquid level of steam drum When, the level value according to measured by the differential pressure levelmeter carries out liquid level protection；Liquid measured by with the second liquid level gauge During measured value of the place value as the liquid level of steam drum, the liquid level protection is exited.
- 19. a kind of machinable medium, instruction is stored with the machinable medium, the instruction is used to cause machine Perform claim requires the method described in 1-9.
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| CN201710651445.XA CN107477561A (en) | 2017-08-02 | 2017-08-02 | Method, apparatus and storage medium for boiler vapor liquid level observing and controlling |
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| CN201710651445.XA CN107477561A (en) | 2017-08-02 | 2017-08-02 | Method, apparatus and storage medium for boiler vapor liquid level observing and controlling |
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Cited By (1)
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| WO2024052636A1 (en) * | 2022-09-09 | 2024-03-14 | Johnson Matthey Davy Technologies Limited | Method for controlling a process comprising a steam system coupled to a reactor system |
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| WO2024052636A1 (en) * | 2022-09-09 | 2024-03-14 | Johnson Matthey Davy Technologies Limited | Method for controlling a process comprising a steam system coupled to a reactor system |
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