CN108224406A - A kind of autocontrol method of boiler steam temperature - Google Patents
A kind of autocontrol method of boiler steam temperature Download PDFInfo
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- CN108224406A CN108224406A CN201810043693.0A CN201810043693A CN108224406A CN 108224406 A CN108224406 A CN 108224406A CN 201810043693 A CN201810043693 A CN 201810043693A CN 108224406 A CN108224406 A CN 108224406A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G5/00—Controlling superheat temperature
- F22G5/20—Controlling superheat temperature by combined controlling procedures
Abstract
The embodiment of the invention discloses a kind of autocontrol methods of boiler steam temperature, it is related to boiler technology field, stove vapor (steam) temperature is controlled by four desuperheating water control loops, respectively first level-one, first two level, second level-one, second two level totally four control loops, the improved method of the present invention is that first two level and second secondary control loop are constant using traditional PID control method, a kind of improvement for imitating artificial experience operation is carried out to first level-one and second level-one control loop, automatically controls boiler temperature realization.The autocontrol method for the boiler steam temperature that the embodiment of the present invention is proposed, purpose is using autocontrol method, make vapor (steam) temperature stabilization in the range of setting value ± 3 DEG C, and when vapor (steam) temperature deviation is more than ± 5 DEG C, its temperature can be controlled faster in the range of setting value ± 3 DEG C, and maximum temperature deviation is no more than ± 10 DEG C.
Description
Technical field
The present invention relates to boiler technology field more particularly to a kind of autocontrol methods of boiler steam temperature.
Background technology
Boiler Steam Temperature is one of major parameter of boiler implosion, and the quality of control effect is directly related to steam
Quality, influence power unit in economic operation.Boiler Steam Temperature is complicated controll plant, and has larger lag feelings
Condition, variation in combustion, flue gas variation, the spray water flux variation intervened manually, the variation of external main steam load, one/Secondary Air
Variation can make main steam temperature be affected.
For above-mentioned factor, the control of main steam temperature had both required externally to have disturbed faster response speed and the rate that stabilizes,
Requirement has stronger restraint to pressure of desuperheating water variation again, makes system with good stability, ensures the steam of high-quality.
The operational effect for adding the method system of manual adjustment by current traditional PID control is undesirable, steam temperature fluctuation it is big (± 10 degrees Celsius,
Short time is fluctuated more than ± 15 DEG C), operations staff intervenes adjusting frequently manually, great work intensity, seriously affects the safety of unit
Property and economy.And for intelligent control methods such as fuzzy control, ANN Controls, although in Main Steam Temperature Control research
In realize preferable effect, but complexity and the restriction of DCS platforms due to its operation and can not realize in dcs.
Chinese Patent Application No. discloses a kind of autocontrol method of vapor (steam) temperature for 200710028794.2, it is intended to carry
It is the degree conversion that Superheat Steam Temperature is deviateed to setting value for a kind of stable, temperature precise control boiler controlling method
Into the heat for needing desuperheat, the heat of desuperheat as needed adjusts attemperation water flow after PID arithmetic, with the desuperheat measured
The heat of practical desuperheat is calculated in water temperature together before and after device, it is known that the heat of practical desuperheat and the heat balance position for needing desuperheat
It puts, the method is still dependent on pid algorithm, and when fluctuating larger for steam temperature, reaction speed is still relatively slow.
Invention content
The purpose of the present invention is to provide a kind of autocontrol method of boiler steam temperature, to solve to lead in the prior art
The above-mentioned defects of cause.
The embodiment of the present invention adopts the following technical scheme that：
A kind of autocontrol method of boiler steam temperature, which is characterized in that the described method comprises the following steps：
Step 1) obtains currently practical vapor (steam) temperature and is compared with vapor (steam) temperature setting value, judges whether to need to level-one desuperheat
Water management circuit adds in adjustment, when temperature deviation is less than 3 DEG C, mainly by PID control secondary circuit, when temperature deviation is more than 3
DEG C when, into following step；
Step 2) obtains water temperature after current steam flow, steam pressure, vapor (steam) temperature, attemperation water flow, desuperheat, to water temperature
Degree, current valve aperture, flue-gas temperature, according to the parameter obtained above, first order calculation circuit desuperheating water valve opening changing value,
Computational methods are：Initial temperature deviation=current steam temperature-vapor (steam) temperature setting value, steam heat deviation=initial temperature are inclined
Difference × steam flow × steam heat correction factor, desuperheat heat=(water temperature-feed temperature after desuperheat) × attemperation water flow ×
Desuperheating water heat correction factor, valve opening changing value=steam heat deviation/desuperheat heat × current valve aperture/flow system
It counts, then final valve opening=valve opening changing value+current valve aperture, wherein discharge coefficient is Nonlinear Adjustment valve valve
The correction factor of aperture and flow proportional, it is assumed that regulating valve is Linear regulating valve, then discharge coefficient is 1；
Step 3) gives control valve opening, and per N seconds, detection vapor (steam) temperature, judged whether vapor (steam) temperature deviation reduces, if warm
Deviation increase is spent, then the aperture of a valve opening changing value is further added by the basis of current valve aperture, gives new adjusting
Valve opening repeats step 3 and (automatically controls and send out report when temperature deviation exits when positive number becomes negative or negative becomes positive number
It is alert), if temperature deviation reduces, calculate vapor (steam) temperature change rate=(preceding vapor (steam) temperature deviation-Current Temperatures deviation)/preceding
Primary steam temperature deviation judges steam change rate whether in expected range, and expectancy changes rate is ranging from：1/ initial temperature is inclined
Difference<Vapor (steam) temperature change rate<2/ initial temperature deviation (value of N is selected depending on demand)；
If step 4) vapor (steam) temperature change rate not in expected range, valve opening changing value=valve opening changing value ×
Change rate regulation coefficient.Desuperheating water valve opening after adjustment is given again, step 3 is repeated, judges whether to meet desired
Vapor (steam) temperature change rate, if vapor (steam) temperature change rate not in expected range, repeatedly step 4, until meeting expected range.
If step 5) vapor (steam) temperature change rate in expected range, reacquires current steam temperature adjusting parameter and protects
This adjustment vapor (steam) temperature adjusting parameter is deposited to be compared with example in case library, if nothing and adjusting parameter similar in this example,
This adjusting parameter is then preserved as reference example, deposit reference example library, parameter includes：Steam flow, steam pressure, steam temperature
Water temperature, feed temperature, current valve aperture, flue-gas temperature, final valve opening after degree, attemperation water flow, desuperheat.
Current Temperatures are reacquired within M seconds after step 6) step 5, if Current Temperatures deviation<3 DEG C, then exit primary circuit
It automatically controls, if Current Temperatures deviation>It 3 DEG C, then reacquires real in current steam temperature adjusting parameter and reference book case library
Example parameter is compared, if in the presence of the instance parameter for meeting adjusting, the final valve opening for directly invoking instance parameter gives
Desuperheating water regulating valve, later repeatedly step 3~6.
Optionally, method is as follows in adjusting parameter deposit case library in the step 5：Take parameter steam flow, steam temperature
Water temperature after degree, steam pressure, attemperation water flow, desuperheat, feed temperature, flue-gas temperature are argument sequence N1, N2, N3, N4, N5,
N6,N7
According to formula：
Wherein, E1 represents the diversity factor of steam adjusting parameter to prestore in current steam temperature adjusting parameter and case library,
Ki represents the weights of i-th of adjusting parameter, and Ni represents i-th of current steam adjusting parameter, and Ni ' represents i-th of adjustment to prestore
Parameter.
It is all according to similar in vapor (steam) temperature in all case libraries of above-mentioned formula calculating with current steam temperature parameter to prestore
The diversity factor of adjusting parameter and current adjusting parameter, obtains minimum difference degree.If above-mentioned minimum difference degree size is greater than or equal to
This adjusting parameter is then stored in case library by preset diversity factor threshold value.
Optionally, call adjusting parameter method in case library as follows in the step 6：Current adjusting parameter is obtained, takes ginseng
Water temperature, feed temperature, flue-gas temperature are parameter sequence after number steam flow, vapor (steam) temperature, steam pressure, attemperation water flow, desuperheat
N1, N2, N3, N4, N5, N6, N7 are arranged,
According to formula：
Wherein, E2 represents the similarity of steam adjusting parameter to prestore in current steam temperature adjusting parameter and case library,
Ki represents the weights of i-th of adjusting parameter, and Ni represents i-th of current steam adjusting parameter, and Ni ' represents i-th of adjustment to prestore
Parameter.
It is all according to similar in vapor (steam) temperature in all case libraries of above-mentioned formula calculating with current steam temperature parameter to prestore
The similarity of adjusting parameter and current adjusting parameter, obtains maximum similarity, and the adjusting parameter that prestores of E2 values maximum is corresponding
Valve opening is set as current valve aperture.
Optionally, the temperature close described in above-mentioned steps is all satisfactions | N2-N2 ' |<The example of=E3.
Wherein E3 is the difference of case library vapor (steam) temperature and current steam temperature, this value can adjust example in access case library
The example ranges that Shi Jinhang similarities and diversity factor calculate.
A kind of autocontrol method of boiler steam temperature based on above-mentioned technical proposal adds manual adjustment to traditional PI D
Control method is improved, and realizes that vapor (steam) temperature automatically controls, and so as to reduce the working strength of operations staff, improves unit fortune
Capable safety and economy, practical application prove, can realize that boiler steam temperature automatically controls using the method for the present invention, steam
The degree of stability of stripping temperature is better than Traditional Method very much, when temperature deviation is less than 3 DEG C, mainly participates in controlling by PID, realizes fine adjust
Section.When temperature deviation is more than 3 DEG C, the autocontrol method that the present invention designs, this method warp are added on the basis of PID control
Crossing the control of acquisition boiler steam temperature has related parameter, is computed the operation of rear mold manual imitation, directly adjusts related control valve opening, real
The quick adjusting of existing temperature reduces the working strength of operations staff, improves safety and the economy of unit operation.
It should be understood that above general description and following detailed description are only exemplary and explanatory, not
The disclosure can be limited.
Description of the drawings
Fig. 1 is boiler water-vapour system flow schematic diagram of the present invention.
Fig. 2 is the Main Steam Temperature Control process flow diagram of the present invention.
Specific embodiment
Below in conjunction with the method in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is part of the embodiment of the present invention, instead of all the embodiments.Based on this hair
Embodiment in bright, the every other implementation that those of ordinary skill in the art are obtained without creative efforts
Example, shall fall within the protection scope of the present invention.
According to one embodiment of the invention, a kind of autocontrol method of boiler steam temperature, the method includes following
Step：
Step 1) obtains currently practical vapor (steam) temperature and is compared with vapor (steam) temperature setting value, judges whether to need to level-one desuperheat
Water management circuit adds in adjustment.When temperature deviation is less than 3 DEG C, mainly by PID control secondary circuit, when temperature deviation is more than 3
DEG C when, into following step；
Step 2) obtains water temperature after current steam flow, steam pressure, vapor (steam) temperature, attemperation water flow, desuperheat, to water temperature
Degree, current valve aperture, flue-gas temperature.According to the parameter obtained above, first order calculation circuit desuperheating water valve opening changing value,
Computational methods are：Initial temperature deviation=actual steam temperature-vapor (steam) temperature setting value, steam heat deviation=initial temperature are inclined
Difference × steam flow × steam heat correction factor, desuperheat heat=(water temperature-feed temperature after desuperheat) × attemperation water flow ×
Desuperheating water heat correction factor, valve opening changing value=steam heat deviation/desuperheat heat × current valve aperture/flow system
It counts, then final valve opening=valve opening changing value+current valve aperture, wherein discharge coefficient is Nonlinear Adjustment valve valve
The correction factor of aperture and flow proportional；
Step 3) gives control valve opening, and per N seconds, detection vapor (steam) temperature, judged whether vapor (steam) temperature deviation reduces, if warm
Deviation increase is spent, then the aperture of a valve opening changing value is further added by the basis of current valve aperture, gives new adjusting
Valve opening repeats step 3, report is automatically controlled and send out when temperature deviation exits when positive number becomes negative or negative becomes positive number
It is alert；If temperature reduces, it is primary to calculate vapor (steam) temperature change rate=(preceding vapor (steam) temperature deviation-Current Temperatures deviation)/preceding
Vapor (steam) temperature deviation judges steam change rate whether in expected range, and expectancy changes rate is ranging from：1/ initial temperature deviation<
Vapor (steam) temperature change rate<2/ initial temperature deviation；
If step 4) vapor (steam) temperature change rate not in expected range, valve opening changing value=valve opening changing value ×
Change rate regulation coefficient gives the desuperheating water valve opening after adjustment again, repeats step 3, judges whether to meet desired
Vapor (steam) temperature change rate, if vapor (steam) temperature change rate, not in expected range, repeatedly step 4, until meeting expected range, works as steaming
Stripping temperature change rate<During 1/ initial temperature deviation, change rate regulation coefficient=1+P, when vapor (steam) temperature change rate>2/ initial temperature
During deviation, change rate regulation coefficient=1-P, wherein P is valve opening changing value regulation.
If step 5) vapor (steam) temperature change rate in expected range, reacquires current steam temperature adjusting parameter and protects
This adjustment vapor (steam) temperature adjusting parameter is deposited to be compared with example in case library, if nothing and adjusting parameter similar in this example,
This adjusting parameter is then preserved as reference example, deposit reference example library, parameter includes：Steam flow, steam pressure, steam temperature
Water temperature, feed temperature, current valve aperture, flue-gas temperature, final valve opening after degree, attemperation water flow, desuperheat；
Current Temperatures are reacquired within M seconds after step 6) step 5, if Current Temperatures deviation<3 DEG C, then exit primary circuit
It automatically controls；If Current Temperatures deviation>It 3 DEG C, then reacquires real in current steam temperature adjusting parameter and reference book case library
Example parameter is compared, if in the presence of the instance parameter for meeting adjusting, the final valve opening for directly invoking instance parameter gives
Desuperheating water regulating valve, later repeatedly step 3~6；
Method is as follows in adjusting parameter deposit case library in the step 5：Take parameter steam flow, vapor (steam) temperature, steam
Water temperature, feed temperature, flue-gas temperature are argument sequence N1, N2, N3, N4, N5, N6, N7 after pressure, attemperation water flow, desuperheat
According to formula：
Wherein, E1 represents the diversity factor of steam adjusting parameter to prestore in current steam temperature adjusting parameter and case library,
Ki represents the weights of i-th of adjusting parameter, and Ni represents i-th of current steam adjusting parameter, and Ni ' represents i-th of adjustment to prestore
Parameter.
It is all according to similar in vapor (steam) temperature in all case libraries of above-mentioned formula calculating with current steam temperature parameter to prestore
The diversity factor of adjusting parameter and current adjusting parameter, obtains minimum difference degree.If above-mentioned minimum difference degree size is greater than or equal to
This adjusting parameter is then stored in case library by preset diversity factor threshold value.
Call adjusting parameter method in case library as follows in the step 6：Current adjusting parameter is obtained, takes parameter steam stream
Water temperature after amount, vapor (steam) temperature, steam pressure, attemperation water flow, desuperheat, feed temperature, flue-gas temperature are argument sequence N1, N2,
N3, N4, N5, N6, N7,
According to formula：
Wherein, E2 represents the similarity of steam adjusting parameter to prestore in current steam temperature adjusting parameter and case library,
Ki represents the weights of i-th of adjusting parameter, and Ni represents i-th of current steam adjusting parameter, and Ni ' represents i-th of adjustment to prestore
Parameter.
It is all according to similar in vapor (steam) temperature in all case libraries of above-mentioned formula calculating with current steam temperature parameter to prestore
The similarity of adjusting parameter and current adjusting parameter, obtains maximum similarity, and the adjusting parameter that prestores of E2 values maximum is corresponding
Valve opening is set as current valve aperture.
Temperature close described in above-mentioned steps is all satisfactions | N2-N2 ' |<The example of=E3,
Wherein E3 is the difference of case library vapor (steam) temperature and current steam temperature, this value can adjust example in access case library
The example ranges that Shi Jinhang similarities and diversity factor calculate.
Various embodiments of the present invention are described above, above description is exemplary, and non-exclusive, and
It is not limited to disclosed each embodiment.In the case of without departing from the scope and spirit of illustrated each embodiment, for this skill
Many modifications and changes will be apparent from for the those of ordinary skill in art field.The selection of term used herein, purport
In the principle for best explaining each embodiment, practical application or to the improvement of the technology in market or make the art
Other those of ordinary skill are understood that each embodiment disclosed herein.
Those skilled in the art will readily occur to the disclosure its after considering specification and putting into practice disclosure disclosed herein
Its embodiment.This application is intended to cover any variations, uses, or adaptations of the disclosure, these modifications, purposes or
Person's adaptive change follows the general principle of the disclosure and including the undocumented common knowledge in the art of the disclosure
Or conventional techniques.
Claims (4)
1. a kind of autocontrol method of boiler steam temperature, it is characterised in that：It the described method comprises the following steps：
Step 1) obtains currently practical vapor (steam) temperature and is compared with vapor (steam) temperature setting value, judges whether to need to level-one desuperheat water control
Circuit processed adds in adjustment.When temperature deviation is less than 3 DEG C, mainly by PID control secondary circuit, when temperature deviation is more than 3 DEG C,
Into following step；
Step 2) obtain water temperature after current steam flow, steam pressure, vapor (steam) temperature, attemperation water flow, desuperheat, feed temperature,
Current valve aperture, flue-gas temperature.According to the parameter obtained above, first order calculation circuit desuperheating water valve opening changing value, meter
Calculation method is：Initial temperature deviation=current steam temperature-vapor (steam) temperature setting value, steam heat deviation=initial temperature deviation
× steam flow × steam heat correction factor, desuperheat heat=(water temperature-feed temperature after desuperheat) × attemperation water flow × subtract
Heat of warm water correction factor, valve opening changing value=steam heat deviation/desuperheat heat × current valve aperture/flow system
It counts, then final valve opening=valve opening changing value+current valve aperture, wherein discharge coefficient is Nonlinear Adjustment valve valve
The correction factor of aperture and flow proportional；
Step 3) gives control valve opening, and per N seconds, detection vapor (steam) temperature, judged whether vapor (steam) temperature deviation reduces, if temperature is inclined
Difference increase is then further added by the aperture of a valve opening changing value on the basis of current valve aperture, gives new regulating valve and opens
Degree repeats step 3, alarm is automatically controlled and send out when temperature deviation exits when positive number becomes negative or negative becomes positive number；
If temperature deviation reduces, it is primary to calculate vapor (steam) temperature change rate=(preceding vapor (steam) temperature deviation-Current Temperatures deviation)/preceding
Vapor (steam) temperature deviation judges steam change rate whether in expected range, and expectancy changes rate is ranging from：1/ initial temperature deviation<
Vapor (steam) temperature change rate<2/ initial temperature deviation；
If step 4) vapor (steam) temperature change rate is not in expected range, valve opening changing value=valve opening changing value × variation
Rate regulation coefficient gives the desuperheating water valve opening after adjustment again, repeats step 3, judges whether to meet desired steam
Rate of temperature change, if vapor (steam) temperature change rate not in expected range, repeatedly step 4, until meeting expected range.
If step 5) vapor (steam) temperature change rate in expected range, reacquires current steam temperature adjusting parameter and preserves this
Secondary adjustment vapor (steam) temperature adjusting parameter is compared with example in case library, if nothing and adjusting parameter similar in this example, are protected
This adjusting parameter is deposited as reference example, deposit reference example library, parameter includes：Steam flow, steam pressure, vapor (steam) temperature,
Water temperature, feed temperature, current valve aperture, flue-gas temperature, final valve opening after attemperation water flow, desuperheat；
Current Temperatures are reacquired within M seconds after step 6) step 5, if Current Temperatures deviation<3 DEG C, then exit the automatic of primary circuit
Control；If Current Temperatures deviation>It 3 DEG C, then reacquires current steam temperature adjusting parameter and joins with example in reference book case library
Number is compared, if in the presence of the instance parameter for meeting adjusting, the final valve opening for directly invoking instance parameter gives desuperheat
Water regulating valve, later repeatedly step 3~6.
2. a kind of autocontrol method of boiler steam temperature according to claim 1, it is characterised in that：The step 5
Method is as follows in middle adjusting parameter deposit case library：It takes parameter steam flow, vapor (steam) temperature, steam pressure, attemperation water flow, subtract
Water temperature, feed temperature, flue-gas temperature are argument sequence N1, N2, N3, N4, N5, N6, N7 after temperature；According to formula：I=1,2 ... 7；
Wherein, E1 represents the diversity factor of steam adjusting parameter to prestore in current steam temperature adjusting parameter and case library, Ki tables
Show the weights of i-th of adjusting parameter, Ni represents i-th of current steam adjusting parameter, and Ni ' represents i-th of adjusting parameter to prestore；
All adjustment that prestore according to similar in vapor (steam) temperature in all case libraries of above-mentioned formula calculating with current steam temperature parameter
The diversity factor of parameter and current adjusting parameter, obtains minimum difference degree；If above-mentioned minimum difference degree size is greater than or equal to default
Diversity factor threshold value, then by this adjusting parameter be stored in case library.
3. a kind of autocontrol method of boiler steam temperature according to claim 1, it is characterised in that：The step 6
Adjusting parameter method is as follows in middle calling case library：Current adjusting parameter is obtained, takes parameter steam flow, vapor (steam) temperature, steam
Water temperature, feed temperature, flue-gas temperature are argument sequence N1, N2, N3, N4, N5, N6, N7 after pressure, attemperation water flow, desuperheat；
According to formula：I=1,2 ... 7；
Wherein, E2 represents the similarity of steam adjusting parameter to prestore in current steam temperature adjusting parameter and case library, Ki tables
Show the weights of i-th of adjusting parameter, Ni represents i-th of current steam adjusting parameter, and Ni ' represents i-th of adjusting parameter to prestore；
All adjustment that prestore according to similar in vapor (steam) temperature in all case libraries of above-mentioned formula calculating with current steam temperature parameter
The similarity of parameter and current adjusting parameter, obtains maximum similarity, by the corresponding valve of the adjusting parameter that prestores of E2 values maximum
Aperture is set as current valve aperture.
4. a kind of autocontrol method of boiler steam temperature according to claim 1, it is characterised in that：In above-mentioned steps
The temperature close is all satisfactions | N2-N2 ' |<The example of=E3；
Wherein E3 is the difference of case library vapor (steam) temperature and current steam temperature, when this value can adjust example in access case library into
The example ranges that row similarity and diversity factor calculate.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111486441A (en) * | 2020-04-17 | 2020-08-04 | 湛江电力有限公司 | Control method for boiler superheated steam temperature override loop |
| CN112696707A (en) * | 2020-12-25 | 2021-04-23 | 神华福能发电有限责任公司 | Control method and control device for metal wall temperature of boiler |
| CN113760003A (en) * | 2021-09-07 | 2021-12-07 | 苏州海宇新辰医疗科技有限公司 | Temperature control method, device and storage medium |
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| CN107101194A (en) * | 2017-06-16 | 2017-08-29 | 重庆大学 | Steam Temperature Control of Boilers |
| CN107178778A (en) * | 2017-06-01 | 2017-09-19 | 中国神华能源股份有限公司 | Steam Temperature for Boiler control device, system and method |
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| US20100072293A1 (en) * | 2007-11-27 | 2010-03-25 | Bernard Flynn | Steam control system |
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| JP2017223431A (en) * | 2016-06-17 | 2017-12-21 | 株式会社東芝 | Plant control device |
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| CN111486441A (en) * | 2020-04-17 | 2020-08-04 | 湛江电力有限公司 | Control method for boiler superheated steam temperature override loop |
| CN111486441B (en) * | 2020-04-17 | 2022-01-28 | 湛江电力有限公司 | Control method for boiler superheated steam temperature override loop |
| CN112696707A (en) * | 2020-12-25 | 2021-04-23 | 神华福能发电有限责任公司 | Control method and control device for metal wall temperature of boiler |
| CN113760003A (en) * | 2021-09-07 | 2021-12-07 | 苏州海宇新辰医疗科技有限公司 | Temperature control method, device and storage medium |
| CN113760003B (en) * | 2021-09-07 | 2022-03-29 | 苏州海宇新辰医疗科技有限公司 | Temperature control method, device and storage medium |
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| CN108224406B (en) | 2019-06-04 |
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