CN108954293A - A kind of double reheat power generation sets Reheated-steam Temperature Control System and method that " graded combination " integrally controls - Google Patents
A kind of double reheat power generation sets Reheated-steam Temperature Control System and method that " graded combination " integrally controls Download PDFInfo
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- CN108954293A CN108954293A CN201810780423.8A CN201810780423A CN108954293A CN 108954293 A CN108954293 A CN 108954293A CN 201810780423 A CN201810780423 A CN 201810780423A CN 108954293 A CN108954293 A CN 108954293A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G5/00—Controlling superheat temperature
- F22G5/06—Controlling superheat temperature by recirculating flue gases
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- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
The invention discloses one kind " graded combination " the double reheat power generation sets Reheated-steam Temperature Control System and method that integrally control, the system comprises: flue gas recirculation system realizes reheat steam temperature totality homophony；Burner pivot angle realizes that control of steam temperature dynamic accelerates to adjust；Gas baffle maintains reheat steam temperature balance；The flue gas recirculation system of single control boiler local link, burner pivot angle and gas baffle integration are constituted the whole process system of control Calculating Radiation Heat Transfer In Furnaces, half radiation heat transfer, heat convection by the method.Using technical solution of the present invention, Switching Logic Control of Reheat Steam Temperature is controlled using the whole process from burner hearth to back-end surfaces, realizes the further promotion of Control platform, ensures the safety and stability of equipment and unit operation.
Description
Technical field
The present invention relates to automatic control for thermal power plant technical fields, and in particular to a kind of " graded combination " integrally controls secondary
Reheating embrittlement Reheated-steam Temperature Control System and method.
Background technique
With the continuous promotion of thermal power generating technology and manufacturing technology, high efficiency, high parameter double reheat power generation sets have become
For field of thermal power in recent years concern emphasis, since double reheat power generation sets are deposited on the process systems such as boiler, steam turbine, bypass
In difference, therefore corresponding control strategy is also mutually in requisition for change, most significant to be exactly after increasing level-one reheater, it is single again
Hot control of steam temperature means have been unable to satisfy requirement.
Currently, the conventional method that reheat steam temperature uses is mainly gas baffle, flue gas recirculation, three kinds of burner pivot angle tune
Section mode cooperates auxiliary adjustment means spray desuperheating, and for double reheat power generation sets, also there are corresponding mode, Shanghai pot in major producer
Furnace factory owner will be adjusted using burner swing, twin flue gas baffle and spray desuperheating；Dongfang Boiler Factory mainly uses three flues
Gas baffle, flue gas recirculation and spray desuperheating are adjusted；Harbin Boiler Plant then mainly uses twin flue gas baffle, flue gas again
Circulation is adjusted with spray desuperheating.As can be seen that major manufacturer mainly chooses two kinds of conducts in three kinds of adjusting methods mainly
Regulating measure adjusts the temperature distribution of reheater bulk temperature and double reheating device respectively, cooperates using spray desuperheating as accident
It adjusts.
Although current regulating measure can be roughly satisfied the adjusting target of double reheat power generation sets reheat steam temperature, but there are still
Following problems: firstly, double reheat power generation sets system is more complicated, the coupling between subsystem is strong, simple two kinds of controlling parties
The combination of formula is difficult to ensure the temperature controlled reasonability of each link；Secondly, the steam temperature parameter of double reheat power generation sets is high, due to material
Expect the limitation of self character, so that the control nargin of vapor (steam) temperature becomes smaller in the process of running, the control for reheat steam temperature
Required precision processed is higher.The presence of problem above needs one kind " graded combination " whole control scheme and comes to existing secondary
Switching Logic Control of Reheat Steam Temperature method improves.
Summary of the invention
In order to solve the problems, such as existing double reheat power generation sets Switching Logic Control of Reheat Steam Temperature, it is an object of the invention to propose one kind
The double reheat power generation sets Reheated-steam Temperature Control System and method that " graded combination " integrally controls use from furnace Switching Logic Control of Reheat Steam Temperature
The whole process of thorax to back-end surfaces controls, and realizes the further promotion of Control platform, ensures the safety of equipment and unit operation
Stablize.
In order to achieve the above objectives, the present invention adopts the following technical scheme:
A kind of double reheat power generation sets Reheated-steam Temperature Control System that " graded combination " integrally controls, the system comprises:
Flue gas recirculation system realizes reheat steam temperature totality homophony；
Burner pivot angle realizes that control of steam temperature dynamic accelerates to adjust；
Gas baffle maintains reheat steam temperature balance.
A kind of double reheat power generation sets Switching Logic Control of Reheat Steam Temperature method that " graded combination " integrally controls, the method is by single control
Flue gas recirculation system, burner pivot angle and the gas baffle integration composition control Calculating Radiation Heat Transfer In Furnaces of boiler local link processed,
The whole process system of half radiation heat transfer, heat convection.
Preferably, the flue gas recirculation system is gone out by adjusting flue gas recirculation amount to eliminate first and second reheater
The deviation of mouth steam temperature and setting value, control object are the average value that double reheating device exports steam temperature, setting value and unit load phase
It is corresponding；Vapor (steam) temperature and load instruction are as feed-forward signal after horizontal flue flue-gas temperature, reheater water injection, when it changes
When, apply different control actions in advance to improve control system response speed；When boiler main fuel trip, flue gas recirculation
Keep fixed value corresponding with steam-water separator pressure.
Preferably, the gas baffle steams the deviation between single reheat vapor (steam) temperature and setting value with double reheat
While deviation between stripping temperature and setting value is identical, reheat steam temperature overall stability, specific control process are maintained are as follows: unit is negative
Lotus instruction is used as feed-forward signal to change in advance when vapor (steam) temperature change of error is very fast after single reheat device and secondary reheater water spray
Become the aperture of gas baffle to improve control system response speed；When main fuel trip occurs for boiler, gas baffle pressure is opened
To 50%, guarantee that forward and backward flue gas evenly distributes.
Preferably, the burner pivot angle use led based on feedovering, to be aided with Temperature Deviation under steady working condition modified
Control strategy wherein leading feed-forward signal is the corresponding swash angle position of different load point, while considering the amendment, no of exhaust gas volumn
With the amendment of mill layer combination.In conjunction with factors such as steam temperature, smoke temperature, boiler load, Changing load-acceleration and amplitudes under operating condition at that time, if
Reasonable dynamic Feedforward is counted, unit varying duty process is used for.Temperature Deviation amendment be only used for steady working condition, in certain amplitude into
Row.
The invention has the following advantages: (1) proposes " graded combination " whole control scheme, it will single control originally
The control method of boiler local link integrates, and Calculating Radiation Heat Transfer In Furnaces, half radiation heat transfer, heat convection can be controlled by constituting
Full-range control method；(2) flue gas recirculation control using horizontal flue flue-gas temperature, after reheater water injection vapor (steam) temperature and
Load instruction cooperates the deviation PID of load setting value and reheat steam temperature mean value to adjust as dynamic Feedforward signal, can be preferably
Control primary, double reheat pipeline section entirety vapor (steam) temperature；(3) gas baffle control is total using the double deviation summations of first and second reheating
PID is adjusted, and is passed through different linear fit functions again to instruction output front end and is assigned to respective gas baffle, adjusting in this way can
Under the premise of being stablized with the whole reheat steam temperature of guarantee, the accurate the quantity of heat convection for adjusting high and low pressure reheater, thus realization one,
The distribution of double reheat steam temperature.
Detailed description of the invention
Fig. 1 is control system general flow chart proposed by the present invention.
Fig. 2 is that the present invention proposes specific control method schematic diagram.
Specific embodiment
The present invention is described in further detail with specific embodiment with reference to the accompanying drawing.
Embodiment 1:
Referring to Fig.1, a kind of double reheat power generation sets Switching Logic Control of Reheat Steam Temperature that " graded combination " integrally controls proposed by the present invention
System, the system comprises:
Flue gas recirculation system realizes reheat steam temperature totality homophony；
Burner pivot angle realizes that control of steam temperature dynamic accelerates to adjust；
Gas baffle maintains reheat steam temperature balance.The ultra supercritical double reheat power generation sets that " graded combination " integrally controls are again
Hot steam temperature control method is related to flue gas recirculation control, is to be reintroduced back to burner hearth by back-end ductwork flue gas to which to change boiler whole
Body radiation heat transfer, heat convection proportion realize the purpose that superheater, reheater steam temperature integrally control；Gas baffle control is logical
The aperture for overregulating back-end ductwork baffle realizes the proportion for changing high pressure, low pressure reheater hot and cold side caloric receptivity, reaches control one
Grade, the purpose of second level reheating temperature；Burner swinging angle control is by changing the position at boiler flame center from the source of burning
It sets, makes the convection heating surface at the top of its close/principle to realize the Temperature Deviation under auxiliary adjustment steady state condition.
A kind of double reheat power generation sets Switching Logic Control of Reheat Steam Temperature method that " graded combination " integrally controls, reference Fig. 2, specifically:
Flue gas recirculation control input is the inclined of single reheat steam temperature and double reheat steam temperature mean value steam temperature setting value corresponding with load
Difference, the i.e. end S of PID are the reheat steam temperature setting value obtained after the linear fitting function of load converts, and the end P is single reheat steam temperature
The mean value obtained with double reheat steam temperature introduces the setting value magnitude of recruitment that burner pivot angle converts through function in PID input terminal, with
Ensure that quick acting flue gas recirculation is as supplement when the movement of burner pivot angle is not enough to adjust whole smoke temperature.PID output is folded
Add horizontal flue flue-gas temperature micro component, unit load instruction micro component, after reheater water injection desuperheat vapor (steam) temperature micro component from
And accelerate the motion stability time, superimposed instruction output after boiler main fuel trip switching is adjusted acts feelings in MFT to movement equipment
Flue gas recirculation keeps fixed value corresponding with steam-water separator pressure under condition.
Gas baffle control input is that single reheat vapor (steam) temperature setting value and actual value deviation and double reheat steam are set
The difference of definite value and actual value deviation, in this, as PID input calculate output valve, be superimposed with unit load instruction micro component from
And the advancement in load change.According to superimposed output, preliminary cigarette is obtained after two linear fit functions convert
Gas baffle opening instruction, the temperature change micro component after being superimposed with respective spray desuperheating, through boiler main fuel trip switching adjust after export to
The controllable register respectively acted, in MFT, gas baffle is forced to open to 50% respectively, guarantees that forward and backward flue gas is uniform
Distribution.
Burner swinging angle control is designed primarily to the opened loop control based on feedforward, and input parameter is respectively that unit load is corresponding
Linear fit value, the corresponding linear fit value of outlet smoke temperature, load change micro component, reheat steam temperature deviation, by these
Amount superposition after bring linear segmented fitting function into, due to burning pivot angle can not often act, piecewise fitting function wide
Output should keep as far as possible stable under general input parameter.Load change differential high level Rule of judgment is arranged simultaneously to put as burner
The precondition that angular motion is made changes burner pivot angle and corrects steam temperature to ensure in opposite steady working condition, flameholding.
In addition, introducing flue gas recycled amount as judging whether current flue gas recirculation regulating power is enough, limited if high more than one,
Burner pivot angle part provides biggish power output supplement, and the portion of whole reheat steam temperature scarce capacity is adjusted to make up flue gas in circulation
Point.
Control logic in control strategy uses standard module:
Differential calculation module,
Mean value computation module,
Linear fit function computation module,Wherein ai, bi, ci
For the parameter being arranged in module.
Read group total module,
PID controller module,
Switching module,
High level monitoring module,Wherein c is the parameter being arranged in module.
Analog module is initialized, y=c, wherein c is the parameter being arranged in module.
Analog input mModule obtains the analog signals or operation result of upstream.
Digital quantity input module obtains the digital quantity signal of upstream.
Control instruction output module, according to control logic algorithm, downstream executing agency's output control refers to
It enables.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (5)
1. a kind of double reheat power generation sets Reheated-steam Temperature Control System that " graded combination " integrally controls, which is characterized in that the system
System includes:
Flue gas recirculation system realizes reheat steam temperature totality homophony；
Burner pivot angle realizes that control of steam temperature dynamic accelerates to adjust；
Gas baffle maintains reheat steam temperature balance.
2. a kind of double reheat power generation sets Switching Logic Control of Reheat Steam Temperature side that " graded combination " according to claim 1 integrally controls
Method, which is characterized in that the method by it is single control boiler local link flue gas recirculation system, burner pivot angle and flue gas
Baffle integration constitutes the whole process system of control Calculating Radiation Heat Transfer In Furnaces, half radiation heat transfer, heat convection.
The double reheat power generation sets Switching Logic Control of Reheat Steam Temperature method that " graded combination " 3. according to claim 2 integrally controls,
Be characterized in that, the flue gas recirculation system by adjust flue gas recirculation amount come eliminate first and second reheater export steam temperature with
The deviation of setting value, control object are the average value that double reheating device exports steam temperature, and setting value is corresponding with unit load；It is horizontal
Vapor (steam) temperature and load instruction are applied as feed-forward signal when it changes in advance after flue gas temperature, reheater water injection
Add different control actions to improve control system response speed；When boiler main fuel trip, flue gas recirculation is kept and vapour
The corresponding fixed value of separator pressure.
The double reheat power generation sets Switching Logic Control of Reheat Steam Temperature method that " graded combination " 4. according to claim 2 integrally controls,
Be characterized in that, the gas baffle make the deviation between single reheat vapor (steam) temperature and setting value with double reheat vapor (steam) temperature with
While deviation between setting value is identical, reheat steam temperature overall stability, specific control process are maintained are as follows: unit load instruction is made
For feed-forward signal, when vapor (steam) temperature change of error is very fast after single reheat device and secondary reheater water spray, change flue gas gear in advance
The aperture of plate is to improve control system response speed；When main fuel trip occurs for boiler, gas baffle pressure is opened to 50%, is protected
Forward and backward flue gas is demonstrate,proved to evenly distribute.
5. according to the double reheat power generation sets Switching Logic Control of Reheat Steam Temperature side that " graded combination " integrally controls described in claim 2,3 or 4
Method, which is characterized in that the burner pivot angle, which is used, is led based on feedovering, is aided with the modified control of Temperature Deviation under steady working condition
Strategy wherein leading feed-forward signal is the corresponding swash angle position of different load point, while considering the amendment of exhaust gas volumn, different mills
The amendment of layer combination.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109751590A (en) * | 2019-02-28 | 2019-05-14 | 西安交通大学 | Double reheat boiler and attemperation of steam method |
| CN109812800A (en) * | 2019-03-13 | 2019-05-28 | 西安交通大学 | The Switching Logic Control of Reheat Steam Temperature method that coal unit high-pressure heater steam extraction throttling participates in |
| CN109882833A (en) * | 2019-03-26 | 2019-06-14 | 西安交通大学 | A kind of double reheat fired power generating unit varying duty process vapor temprature control method |
| CN111736637A (en) * | 2020-05-20 | 2020-10-02 | 山东中实易通集团有限公司 | Steam temperature control system and method based on hearth temperature measurement |
| CN112377890A (en) * | 2020-11-23 | 2021-02-19 | 华北电力大学 | Method and system for adjusting flue gas recirculation quantity of double reheating unit |
| CN112648606A (en) * | 2020-10-29 | 2021-04-13 | 北京国电智深控制技术有限公司 | Steam temperature cooperative control system of double-reheating ultra-supercritical boiler |
| CN113091046A (en) * | 2021-04-15 | 2021-07-09 | 中国电力工程顾问集团华东电力设计院有限公司 | Double reheat boiler and outlet steam temperature control method and device thereof |
| CN113587141A (en) * | 2021-07-09 | 2021-11-02 | 佛山市顺德五沙热电有限公司 | Automatic regulation and control system of thermal power generating unit combustor pivot angle |
| CN113883497A (en) * | 2021-10-29 | 2022-01-04 | 国能龙源环保有限公司 | Optimal control method for reheating steam temperature of boiler of thermal power plant |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109751590A (en) * | 2019-02-28 | 2019-05-14 | 西安交通大学 | Double reheat boiler and attemperation of steam method |
| CN109812800A (en) * | 2019-03-13 | 2019-05-28 | 西安交通大学 | The Switching Logic Control of Reheat Steam Temperature method that coal unit high-pressure heater steam extraction throttling participates in |
| CN109812800B (en) * | 2019-03-13 | 2020-08-04 | 西安交通大学 | Reheating steam temperature control method with participation of steam extraction throttling of high-pressure heater of coal-fired unit |
| CN109882833A (en) * | 2019-03-26 | 2019-06-14 | 西安交通大学 | A kind of double reheat fired power generating unit varying duty process vapor temprature control method |
| CN109882833B (en) * | 2019-03-26 | 2020-02-18 | 西安交通大学 | Steam temperature control method for load-variable process of secondary reheating thermal power generating unit |
| CN111736637A (en) * | 2020-05-20 | 2020-10-02 | 山东中实易通集团有限公司 | Steam temperature control system and method based on hearth temperature measurement |
| CN112648606A (en) * | 2020-10-29 | 2021-04-13 | 北京国电智深控制技术有限公司 | Steam temperature cooperative control system of double-reheating ultra-supercritical boiler |
| CN112377890A (en) * | 2020-11-23 | 2021-02-19 | 华北电力大学 | Method and system for adjusting flue gas recirculation quantity of double reheating unit |
| CN112377890B (en) * | 2020-11-23 | 2021-07-30 | 华北电力大学 | Method and system for adjusting flue gas recirculation quantity of double reheating unit |
| CN113091046A (en) * | 2021-04-15 | 2021-07-09 | 中国电力工程顾问集团华东电力设计院有限公司 | Double reheat boiler and outlet steam temperature control method and device thereof |
| CN113587141A (en) * | 2021-07-09 | 2021-11-02 | 佛山市顺德五沙热电有限公司 | Automatic regulation and control system of thermal power generating unit combustor pivot angle |
| CN113587141B (en) * | 2021-07-09 | 2024-04-05 | 佛山市顺德五沙热电有限公司 | Automatic regulation and control system for swing angle of thermal power generating unit burner |
| CN113883497A (en) * | 2021-10-29 | 2022-01-04 | 国能龙源环保有限公司 | Optimal control method for reheating steam temperature of boiler of thermal power plant |
| CN113883497B (en) * | 2021-10-29 | 2024-01-19 | 国能龙源环保有限公司 | Thermal power plant boiler reheat steam temperature optimal control method |
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Application publication date: 20181207 |