CN109595544B - The Water Level Control of Steam method and control system, drum and natural circulation boiler - Google Patents
The Water Level Control of Steam method and control system, drum and natural circulation boiler Download PDFInfo
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- CN109595544B CN109595544B CN201811428147.5A CN201811428147A CN109595544B CN 109595544 B CN109595544 B CN 109595544B CN 201811428147 A CN201811428147 A CN 201811428147A CN 109595544 B CN109595544 B CN 109595544B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 114
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- 238000012937 correction Methods 0.000 claims abstract description 15
- 230000033228 biological regulation Effects 0.000 claims abstract description 8
- 238000006243 chemical reaction Methods 0.000 claims abstract description 7
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D5/00—Controlling water feed or water level; Automatic water feeding or water-level regulators
- F22D5/26—Automatic feed-control systems
- F22D5/30—Automatic feed-control systems responsive to both water level and amount of steam withdrawn or steam pressure
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
The invention discloses a kind of the Water Level Control of Steam method, belong to Natural Circulation field, including at interval of preset time, obtains the steam flow signal of reaction vapor flow and react the feedwater flow signal of feedwater flow；Difference relationship based on added up, steam flow and feedwater flow calculates and updates the deviation for balancing amendment steam flow and feedwater flow by preset learning algorithm；Using deviation, balance amendment steam flow target obtains feedwater flow equilibrium valve；Based on feedwater flow equilibrium valve and water level deviation, by preset correction algorithm, the feedwater flow target through water level drift correction is calculated；Feedwater flow target is applied directly to regulating valve and carries out single pulse water level regulation；Or clipping adjustment is carried out to feedwater flow target, and the homophony of three blunt quantity control is limited with clipping clipping range adjusted, realize water level regulation.The influence for helping avoid false water level has the advantages that water level control is accurate, efficient, more optimal.
Description
Technical field
The present invention relates to a kind of steam boilers, more specifically, it relates to a kind of the Water Level Control of Steam method and control system
System, drum and natural circulation boiler.
Background technique
Thermoelectricity, thermoelectricity all can carry out energy conversion using boiler, and water is become high temperature and high pressure steam, and what is entered is water,
What is gone out is steam.Wherein, drum is the container of the steam-water mixing under saturation state, and vapour and water separate herein, and water level influences
It is kept the safety in production.Water level cannot be too high, otherwise water entrained by steam is caused to impact, and brings security risk；Water level cannot be too low, otherwise,
It is easy dry pot.Therefore in the industry spot for having boiler vessel, water level control is a very important safety index.
Existing the Water Level Control of Steam is using conventional the Regulative system of three impulses feedwater.It is adjusted in three impulses water supply and is
In system, adjuster receives three steam water-level, steam flow, feedwater flow signals, and wherein steam water-level is main signal, any to disturb
SEA LEVEL VARIATION caused by dynamic, can all be such that adjuster acts, and change feedwater flow, water level is made to be restored to given value;Steam flow is
Feed-forward signal, it can prevent the adjuster malfunction as caused by " false water level ", improve the adjusting under steam flow disturbance
Quality;The two signal cooperations of steam flow and feedwater flow, can eliminate the static difference of system.When feedwater flow variation, water flow is given
Measurement sensor response quickly, can react the variation of feedwater flow in time, so feedwater flow signal makes as feedback signal
Adjuster is disturbed in capable of capable of being eliminated according to feed-forward signal when water level has not occurred variation, stablizes adjustment process, is played steady
Determine the effect of feedwater flow.
But there is also following defects in practical applications for above-mentioned control method:
1, drum operates normally in the saturated condition, increases the feedwater flow of saturation, and water level can increase, on the contrary then can drop
It is low.If water supply is not saturated water, increase feedwater flow, it is first to drop that steam water-level will not increase immediately, crosses and just can for a long time
Rise, conversely, reducing feedwater flow, water level is first increased and reduced afterwards, similarly increases and decreases water supply, the secondary zero crossing of water level is traditional
PID(otherwise be positive interaction or be reaction) it is not applicable, three impulses PID is adjusted and APC Dynamic matrix control is all limited with regard to effect
.If user terminal steam demand increases, steam flow becomes larger, and drum pressure can decline, under steam-water mixing state, steam bubble volume
Increase, water level rises, and generates false water level, and long-time water level still can decline, and can only inhibit false with steam flow feedforward
Water level.But load (steam flow to represent) fluctuation is big, and it is big to will cause water-level fluctuation, or even jeopardizes life for frequent false water level
Produce safety.
2, when drum emergency blowoff will affect traditional control method, majority cannot put into automatic fortune when main vapour header is vented
Row, it is necessary to which operation is intervened manually.Boiler there are when steam leakage, SEA LEVEL VARIATION also can change dramatically, automatic effects are limited, influence
Safe operation.
Summary of the invention
In view of the deficienciess of the prior art, the first object of the present invention is to provide a kind of the Water Level Control of Steam method,
The influence for helping avoid false water level has the advantages that water level control is accurate, efficient, more optimal.
To achieve the above object, the present invention provides the following technical scheme that
A kind of the Water Level Control of Steam method, including
At interval of preset time, obtains the steam flow signal of reaction vapor flow and react the feedwater flow of feedwater flow
Signal；
It is calculated based on the difference relationship of having added up, every group of steam flow and feedwater flow by preset learning algorithm
It is used to balance the deviation for correcting steam flow and feedwater flow with updating；
Using the deviation, balance amendment steam flow target obtains feedwater flow equilibrium valve；
Based on feedwater flow equilibrium valve and water level deviation, by preset correction algorithm, it is calculated and is repaired through water level deviation
Positive feedwater flow target；
Feedwater flow target is applied directly to regulating valve and carries out single pulse water level regulation；Or
Based on feedwater flow target, by preset slicing algorithm, clipping adjustment carried out to feedwater flow target, and with limiting
The homophony of clipping range limitation three blunt quantity control adjusted, realizes water level regulation.
By adopting the above technical scheme, for the steam flow signal of acquisition and feedwater flow signal, pass through learning algorithm, meter
The deviation of steam flow and feedwater flow is calculated, which is that the difference of selection amount passes through the statistical result that operation obtains,
Can be used under different moisture balance states, feedwater flow calculated by the steam flow of variation, the feedwater flow be by
Balanced adjustment, facilitate the influence for eliminating moisture balance factor.On the other hand, the acquisition of signal and the calculating of deviation study
Be constantly accumulative and alternate, be adapted with each changing factor, thus the deviation for the variation that constantly alternates best embody it is new
Moisture balance variation, to be adapted to the adjusting of various sudden changes.When specific adjustment, pass through deviation and steam flow mesh
Mark is calculated the modified feedwater flow equilibrium valve of balance, feedwater flow equilibrium valve is then carried out water level by correction algorithm
Drift correction obtains the feedwater flow target of second-order correction, which carries out the amendment of moisture balance by deviation, disappears
Except some factors cause steam uneven and then caused false water level, and the amendment Jing Guo water level deviation, can more there be needle
Water level is adjusted in property, adjusts efficient；Specific when adjusting, a kind of mode uses Three-value control, by feedwater flow control
Feedwater flow target after being made as second-order correction is simplified to Three-value control so that traditional three blunt quantity control be subtracted, and does not have to drum
Water level homophony, on the basis of controlling fast, accurately, simplified control mode；Another way be traditional three blunt quantity control into
One step is improved, and feedwater flow target is carried out clipping adjusting, goes to limit the defeated of traditional three impulses homophony with the result that clipping is adjusted
Out, the feedwater flow target of three blunt quantity control is limited at any time between the result of width adjusting, in accurately and efficiently base
On plinth, will not also overshoot, more optimize.
Further, based on the steam flow and feedwater flow newly obtained, on the basis of the deviation of last computation study,
Weighted average, numerology acquistion to new deviation.
By adopting the above technical scheme, for original deviation, the data newly obtained are superimposed, using average weighted mode
It calculates, calculation method more optimizes, and calculation amount is small.
Further, the weighted average includes: On=(RT*120*On-1+ M*(Im-In))/(RT*120+M), wherein OnFor
The accumulative deviation learnt of the steam flow and feedwater flow obtained so far, On-1For the steam obtained based on the last time
Flow and the accumulative deviation learnt of feedwater flow, RT*120 are the weight of the deviation of last study, and Im is this
Feedwater flow, In are this steam flow, and M is the weight of flow deviation (Im-In).
By adopting the above technical scheme, the deviation and its weight learnt by the last time, and this time new flow are inclined
Difference and its weight, divided by sum of weight after addition, balancing before not only combining as a result, but also constantly absorb new influence data,
It is continuous to calculate, learn and adjust, suitable for new variation.
Further, the correction algorithm includes: Os=Ob+LIMIT (- 1*K1, DP/K2, K1), and wherein Os is feedwater flow
Target, Ob are feedwater flow equilibrium valve, and LIMIT (- 1*K1, DP/K2, K1) is the water level deviation after clipping, and K1 is preset water
Position limited amplitude, K2 are the adjustment factor of preset water level deviation, and DP is the water level deviation of target water level and actual water level.
By adopting the above technical scheme, water level drift correction will be carried out again through the modified Ob of overbalance, obtained feedwater flow
Target is more accurate, and water level deviation is after clipping as a result, helping to prevent adjustment excessive, so that control is more steady
It is fixed.
Further, the slicing algorithm includes: OT=Os+K3, OB=Os-K3, wherein OT be carry out three blunt quantity control to
The upper limit value of water flow target, OB are the lower limit values for carrying out the water supply target of three blunt quantity control, and K3 is preset adjusting limitation width
Degree.
By adopting the above technical scheme, in a certain range by adjustment limitation, it is excessive to facilitate adjustment, so that control is more steady
It is fixed.
It further, further include judging steam flow signal respectively when obtaining steam flow signal and feedwater flow signal
And whether feedwater flow signal meets acquisition standard, is acquired if the two meets simultaneously, otherwise reacquires.
By adopting the above technical scheme, acquired steam flow signal and feedwater flow signal are screened, it will be undesirable
Rejecting, reduce the influence of abnormal signal, indirectly enhancing control accuracy.
It further, further include judging whether to need to learn, if desired learning, then carry out study before learning algorithm study
Otherwise algorithm directly assigns deviation by input.
By adopting the above technical scheme, it sometimes in the mutation of water level being anticipated that, if being controlled by way of study, needs
Multiple study and adjustment deviation, or can also be directly by judgement, selection directly inputs the mode of deviation, and control is more
It is direct and efficient.
In view of the deficienciess of the prior art, the second object of the present invention is to provide a kind of drum level control system,
The influence for helping avoid false water level has the advantages that water level control is accurate, efficient, more optimal.
To achieve the above object, the present invention provides the following technical scheme that
A kind of drum level control system, including processor and memory, the memory store instruction collection supply the place
Reason device calls the function to realize the Water Level Control of Steam method as described above.
By adopting the above technical scheme, the function of the above method is realized by instruction set that processor run memory stores
Can, intelligent high, control is accurate, reaction speed is fast.
In view of the deficienciess of the prior art, the third object of the present invention is to provide a kind of drum, void is helped avoid
The influence of artifical water height has the advantages that water level control is accurate, efficient, more optimal.
To achieve the above object, the present invention provides the following technical scheme that
A kind of drum, including drum level control system as described above.
In view of the deficienciess of the prior art, the fourth object of the present invention is to provide a kind of natural circulation boiler, help
In the influence for avoiding false water level, have the advantages that water level control is accurate, efficient, more optimal.
To achieve the above object, the present invention provides the following technical scheme that
A kind of natural circulation boiler, including boiler as described above.
In conclusion the invention has the following advantages:
1. measuring instrumentss error change and system run, drip, leak etc. cause disengaging steam matter when blowdown mode changes
After amount balance is upset, programming count can be learnt automatically, the Water Vapor Quality balance deviation value before changing is realized flat in new carbonated drink
Steam water-level under weighing apparatus steadily controls；
2. helping avoid the influence of false water level, have the advantages that water level control is accurate, efficient, more optimal.
Detailed description of the invention
Fig. 1 is that the direct water level of method for controlling water level in the present invention adjusts flow diagram；
Fig. 2 is that the indirect water level of method for controlling water level in the present invention adjusts flow diagram.
Specific embodiment
With reference to the accompanying drawings and embodiments, the present invention will be described in detail.
Embodiment 1
A kind of the Water Level Control of Steam method, referring to FIG. 1 and FIG. 2, including following process step:
Step S101: the characteristic signal of reaction water position status is obtained, characteristic signal includes the steam stream of reaction vapor flow
It measures signal and reacts the feedwater flow signal of feedwater flow.
Step S102: judge whether the steam flow signal of the group and feedwater flow signal are normal, if the two meets simultaneously
Acquisition standard then enters next step, otherwise returns to previous step.
Step S103: judging whether to learn, if receiving the signal for suspending the secondary study, it is laggard to carry out assignment to deviation
Enter next step, is otherwise directly entered next step.
Step S104: it by preset learning algorithm, calculates and updates for correcting steam flow and feedwater flow balance
The deviation of relationship；
Step S105: applying deviation, and balance amendment steam flow target obtains feedwater flow equilibrium valve；
Step S106: it is calculated by preset correction algorithm through water based on feedwater flow equilibrium valve and water level deviation
The feedwater flow target of position drift correction；
Step S107: feedwater flow target is applied directly to regulating valve and carries out single pulse water level regulation；Or it is based on water supply
Flow targets carry out clipping adjustment to feedwater flow target by preset slicing algorithm, and with clipping clipping model adjusted
The homophony of limitation three blunt quantity control is enclosed, realizes water level regulation.
Step S108: interval preset duration reenters step S101.
In step S101, the mode for obtaining steam flow signal and feedwater flow signal is, using corresponding sensor, to incite somebody to action
Respective physical signal is converted into electric signal corresponding with respective test object.
In step S102, judge the whether normal mode of signal for respectively by steam flow signal and feedwater flow signal with
Respective acquisition standard is compared, if the two all meets acquisition standard, for normal signal, is otherwise abnormal signal, needs
It rejects.The step helps to eliminate the influence of abnormal signal, and study abnormal signal is avoided to influence the accurate of control.
It in step S103, judges whether the destination of study, is sometimes being needed directly to deviation assignment, relative to
Machine gradually learns deviation, can more effectively be regulated and controled.
In step S104, preset learning algorithm includes: to be counted based on the steam flow and feedwater flow newly obtained in last time
On the basis of the deviation that mathematics is practised, weighted average, numerology acquistion to new deviation.It specifically includes: On=(RT*120*
On-1+ M*(Im-In))/(RT*120+M), wherein OnThe accumulative study of steam flow and feedwater flow to obtain so far is arrived
Deviation, On-1For the accumulative deviation learnt of steam flow and feedwater flow obtained based on the last time, RT*120 is upper
The weight of the deviation once learnt, Im are this feedwater flow, and In is this steam flow, and M is flow deviation (Im-
In weight).The deviation and its weight learnt by the last time, and this time new flow deviation and its weight, are added
Afterwards divided by the sum of weight, this calculation not only combine before deviation as a result, but also constantly absorb new influence data, no
Disconnected calculating, study and adjustment achievees the purpose that study and adapts to new change.
In step S105, feedwater flow equilibrium valve Ob=On+ Is, wherein OnFor the steam flow that obtains so far and
The accumulative deviation learnt of feedwater flow, Is are steam flow target.
In step S106, correction algorithm includes: Os=Ob+LIMIT (- 1*K1, DP/K2, K1), and wherein Os is feedwater flow
Target, Ob are feedwater flow equilibrium valve, and LIMIT (- 1*K1, DP/K2, K1) is the water level deviation after clipping, and K1 is preset water
Position limited amplitude, K2 are the adjustment factor of preset water level deviation, and DP is the water level deviation of target water level and actual water level.
Slicing algorithm includes: OT=Os+K3, OB=Os-K3, wherein OT is the feedwater flow target for carrying out three blunt quantity control
Upper limit value, OB be carry out three blunt quantity control water supply target lower limit value, K3 is preset adjusting limited amplitude.
Embodiment 2
A kind of drum level control system, including processor and memory, memory store instruction collection supply the processor
It calls to realize the function such as the Water Level Control of Steam method in embodiment 1.
Embodiment 3
A kind of drum, including the drum level control system in such as embodiment 2.
Embodiment 4
A kind of natural circulation boiler, including the drum in such as embodiment 3.
The above is only a preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-mentioned implementation
Example, all technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.It should be pointed out that for the art
Those of ordinary skill for, several improvements and modifications without departing from the principles of the present invention, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (10)
1. a kind of the Water Level Control of Steam method, it is characterised in that: including
At interval of preset time, obtains the steam flow signal of reaction vapor flow and react the feedwater flow letter of feedwater flow
Number；
Based on the difference relationship of having added up, every group of steam flow and feedwater flow, by preset learning algorithm, calculate and more
It is used newly in the deviation of balance amendment steam flow and feedwater flow；
Using the deviation, balance amendment steam flow target obtains feedwater flow equilibrium valve；
Based on feedwater flow equilibrium valve and water level deviation, by preset correction algorithm, it is calculated through water level drift correction
Feedwater flow target；
Feedwater flow target is applied directly to regulating valve and carries out single pulse water level regulation；Or
Based on feedwater flow target, by preset slicing algorithm, clipping adjustment carried out to feedwater flow target, and with clipping tune
The homophony of clipping range limitation three blunt quantity control after whole, realizes water level regulation.
2. the Water Level Control of Steam method according to claim 1, it is characterised in that: the learning algorithm includes: based on new
The steam flow and feedwater flow of acquisition, on the basis of the deviation of last computation study, weighted average, numerology acquistion is arrived
New deviation.
3. the Water Level Control of Steam method according to claim 2, it is characterised in that: the weighted average includes: On=(RT*
120*On-1+ M*(Im-In))/(RT*120+M), wherein OnFor accumulative of steam flow and feedwater flow obtained so far
The deviation practised, On-1For the accumulative deviation learnt of steam flow and feedwater flow obtained based on the last time, RT*120
For the weight of the deviation of last time study, Im is this feedwater flow, and In is this steam flow, and M is flow deviation
(Im-In) weight.
4. the Water Level Control of Steam method according to any one of claims 1 to 3, it is characterised in that: the correction algorithm includes:
Os=Ob+LIMIT (- 1*K1, DP/K2, K1), wherein Os be feedwater flow target, Ob be feedwater flow equilibrium valve, LIMIT (-
1*K1, DP/K2, K1) it is water level deviation after clipping, K1 is preset water level limited amplitude, and K2 is preset water level deviation
Adjustment factor, DP are the water level deviation of target water level and actual water level.
5. the Water Level Control of Steam method according to claim 4, it is characterised in that: the slicing algorithm includes: OT=Os+
K3, OB=Os-K3, wherein OT is the upper limit value for carrying out the feedwater flow target of three blunt quantity control, and OB is to carry out three blunt quantity control
Water supply target lower limit value, K3 is preset adjusting limited amplitude.
6. the Water Level Control of Steam method according to any one of claims 1 to 3, it is characterised in that: further include obtaining steam
When flow signal and feedwater flow signal, judge whether steam flow signal and feedwater flow signal meet acquisition standard respectively,
It is acquired if the two meets simultaneously, otherwise reacquires.
7. the Water Level Control of Steam method according to any one of claims 1 to 3, it is characterised in that: further include in learning algorithm
Before study, judge whether to need to learn, if desired learn, then carry out learning algorithm, otherwise directly assigns deviation by input.
8. a kind of drum level control system, it is characterised in that: including processor and memory, the memory store instruction collection
The function to realize the Water Level Control of Steam method as described in claim 1 to 7 is any is called for the processor.
9. a kind of drum, it is characterised in that: including drum level control system as claimed in claim 8.
10. a kind of natural circulation boiler, it is characterised in that: including drum as claimed in claim 9.
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| CN201811428147.5A CN109595544B (en) | 2018-11-27 | 2018-11-27 | The Water Level Control of Steam method and control system, drum and natural circulation boiler |
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| CN201811428147.5A CN109595544B (en) | 2018-11-27 | 2018-11-27 | The Water Level Control of Steam method and control system, drum and natural circulation boiler |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112066360B (en) * | 2020-09-15 | 2023-09-19 | 万华化学集团股份有限公司 | Control method for drum liquid level display, storage medium and electronic equipment |
| CN113898939B (en) * | 2021-11-22 | 2023-09-19 | 江苏科技大学 | Three-impulse drum water level control system and method based on double neurons |
| CN117759922B (en) * | 2024-01-27 | 2024-07-16 | 海宁马桥大都市热电有限公司 | Boiler drum water level optimization algorithm control system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000179804A (en) * | 1998-12-11 | 2000-06-27 | Meidensha Corp | Water level controller for boiler drum |
| CN101101112A (en) * | 2007-04-29 | 2008-01-09 | 上海红箭自动化设备有限公司 | Control method of boiler water level and its control system |
| EP2453172A1 (en) * | 2008-11-21 | 2012-05-16 | Hitachi Ltd. | Liquid level control system |
| CN204665250U (en) * | 2015-05-25 | 2015-09-23 | 苏州迪森生物能源有限公司 | A kind of biomass boiler Feed Water Regulation System |
| CN108224404A (en) * | 2017-11-29 | 2018-06-29 | 内蒙古北方重工业集团有限公司 | Drum Water Level Control System for Boiler and its control method |
-
2018
- 2018-11-27 CN CN201811428147.5A patent/CN109595544B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000179804A (en) * | 1998-12-11 | 2000-06-27 | Meidensha Corp | Water level controller for boiler drum |
| CN101101112A (en) * | 2007-04-29 | 2008-01-09 | 上海红箭自动化设备有限公司 | Control method of boiler water level and its control system |
| EP2453172A1 (en) * | 2008-11-21 | 2012-05-16 | Hitachi Ltd. | Liquid level control system |
| CN204665250U (en) * | 2015-05-25 | 2015-09-23 | 苏州迪森生物能源有限公司 | A kind of biomass boiler Feed Water Regulation System |
| CN108224404A (en) * | 2017-11-29 | 2018-06-29 | 内蒙古北方重工业集团有限公司 | Drum Water Level Control System for Boiler and its control method |
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