CN108224468A - The method that water based on unit load instruction, wind instruction generate circuit - Google Patents
The method that water based on unit load instruction, wind instruction generate circuit Download PDFInfo
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- CN108224468A CN108224468A CN201711377679.6A CN201711377679A CN108224468A CN 108224468 A CN108224468 A CN 108224468A CN 201711377679 A CN201711377679 A CN 201711377679A CN 108224468 A CN108224468 A CN 108224468A
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- instruction
- unit load
- load instruction
- wind
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B35/00—Control systems for steam boilers
- F22B35/18—Applications of computers to steam boiler control
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- Combustion & Propulsion (AREA)
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- Thermal Sciences (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
The invention discloses a kind of method that water based on unit load instruction, wind instruction generate circuit, including following method：Unit load instruction is respectively formed three kinds of circuits after obtaining boiler command adapted thereto initial value by polygronal function f (x)：First circuit：Unit load instruction, polygronal function f11 (x), confluent instruction initial value, feed water control system；Second servo loop：Unit load instruction, polygronal function f12 (x), First air wind pressure instruction initial value, primary air pressure Force control system；Tertiary circuit：Unit load instruction, polygronal function f13 (x), air quantity instruction initial value, air supply control system.The method of the present invention can accurately control furnace coal weight, confluent and the air output of boiler, improve the operational efficiency of unit, improve safety and the economy of unit.
Description
【Technical field】
The present invention relates to thermal power plant Coordinated Control Systems technical field, a kind of more particularly to be directed to goes with each other all the time
The method that the water based on unit load instruction of mill coal pulverizer system once-through boiler unit, wind instruction generate circuit.
【Background technology】
The definite value that super/extra-supercritical unit need to follow strictly ratio of water to coal to water management constrains, and the control of traditional ratio of water to coal is
Instructing to coal for boiler is generated respectively according to boiler master instruction by two functions to instruct with feeding water, pair of two of which function
The coal-water ratio according to boiler normal operation that should put is set.In addition, the relationship between wind, coal is also pair by this function
Answer relational implementation.However, the once-through boiler unit of the pulverized coal preparation system for double inlet and outlet coal mill is configured, since furnace coal weight is by outer
The factor of boundary's interference is more, and in order to ensure the demand of as-fired coal conscientiously, the amplitude of variation of boiler instruction may be because of powder system processed
System operating status changes and changes.So, actually entering the coal-supplying amount of burner hearth may change less, and boiler master becomes
Change air output instruction big, thus that the confluent and pressure fan of boiler can be influenced.In reality in this case, confluent and air quantity
Be without significantly change, thus, the generation circuit of this traditional feedwater and air-supply is for being furnished with double inlet and outlet coal mill
It is not actually a kind of ideal scheme for Once-through Boiler, and this traditional scheme is in double inlet and outlet coal mill pulverized coal preparation system machine
The imbalance of coal water, the imbalance of wind coal, greatly affected safety and the warp of unit when implementing to be easy to cause boiler normal operation in group
Ji property.
【Invention content】
It is current to solve the present invention provides a kind of method that water based on unit load instruction, wind instruction generate circuit
In the unit double inlet and outlet coal mill pulverized coal preparation system of thermal power plant the problem of the imbalance of steam coal water, the imbalance of wind coal.
To solve the above problems, the present invention uses following technical scheme：
A kind of method that water based on unit load instruction, wind instruction generate circuit, unit load instruction pass through broken line letter
Number f (x) is respectively formed three kinds of circuits after obtaining boiler command adapted thereto initial value：
First circuit：Unit load instruction, polygronal function f11 (x), confluent instruction initial value, feed water control system；
Second servo loop：Unit load instruction, polygronal function f12 (x), First air wind pressure instruction initial value, primary air pressure
Control system；
Tertiary circuit：Unit load instruction, polygronal function f13 (x), air quantity instruction initial value, air supply control system.
Preferably, unit load instruction obtains confluent instruction just by polygronal function f11 (x) in first circuit
Before initial value, previously-introduced centrum's temperature is corrected.
Preferably, the centrum's temperature correction is carried out by polygronal function f14 (x).
Preferably, unit load instruction obtains air output instruction initially by polygronal function f13 (x) in the tertiary circuit
Before value, previously-introduced oxygen amount is corrected.
Preferably, the oxygen amount correction is carried out by polygronal function f15 (x).
Preferably, unit load instruction is advanced by after polygronal function f11 (x), passing sequentially through in first circuit
Then delay component, inertial element obtain confluent instruction initial value.
Preferably, the dynamic when lead-lag link plays varying duty adds water function, to adapt to the dynamic of boiler
The process of refuelling.
Preferably, the inertial element is to be matched in time with fuel quantity variation, pass through the inertial element
To simulate difference of the coal-supplying amount step to the generation dynamic characteristic of steam flow and feedwater step between steam generation dynamic characteristic
Not.
Preferably, after unit load instruction passes through polygronal function f12 (x) in the second servo loop, then by advanced stagnant
Metasomite is increased or decreased with adjusting the quick of coal pulverizer powder bucket memory powder by primary air pressure, so as to which capacity wind be assisted to carry
Coal dust ability adapts to the requirement of unit load variations.
Preferably, after unit load instruction passes through polygronal function f13 (x) in the tertiary circuit, then by advanced stagnant
Metasomite first adds the setting of coal after wind and meets the combustion process of burner hearth to meet coal pulverizer.
In one of the embodiments, when unit exits coordinated control mode, unit load instruction trace actual power
Power, thus instruction at this time can be fluctuated often, the lead-lag link in command drcuit returns the control of above-mentioned important parameter
The disturbance quantity on road will be bigger.For this purpose, the lead-lag link declines in circuit need to even be cancelled.Particularly, it feeds water
Circuit also needs to carry out the of short duration practical confluent of tracking to confluent instruction initial value when unit operation mode switches, to prevent
During load instruction significantly change, confluent instructs initial value mutation, leads to coal and the numerous imbalances of water ratio.
In one of the embodiments, when runback operating mode occurs suddenly for unit, the feedwater for unit
The generation of instruction is most important.The process of fuel is quickly reduced according to the scheduled rate of runback when unit is instructed
In, due to boiler, also there are certain accumulation of heats, and the change procedure that feeds water when feedwater flow at this time should be than normal operation is slow, i.e.,
The time constant of inertial element should be lengthened in confluent instruction initial value generates circuit, so that boiler heat storage and coal pulverizer
The speed of excision is consistent, and ensures the static state of both feedwater and burning under runback operating mode with dynamically matching.
The present invention is in order to simplify design, not using the control method of intermediate point enthalpy, still using traditional intermediate point temperature
Corrective control scheme is spent, is based primarily upon following three points consideration：
(1) intermediate point enthalpy generally believes linear preferable in Once-through Boiler control, however in Practical Project and application, in
Between point belong to micro- overheated zone, calculate enthalpy and often switch near saturation region and overheated zone, the calculating of enthalpy is complex,
It is unfavorable for the normal control of system instead；
(2) setting value of currently used intermediate point enthalpy control is the intermediate point by actual set pressure and design
Temperature generates, and is not generated in strict accordance with design pressure, actually the single function of centrum's temperature, thus in certain journey
The ideal effect of intermediate point enthalpy control has been slackened on degree；
(3) centrum's temperature is a very intuitive magnitude for operations staff, advantageous using this control program
In monitoring and operation of the operations staff to production process.
The method that water, wind instruction the present invention is based on unit load instruction generate circuit, overcomes double inlet and outlet coal mill
The unnecessary interference that other control systems are generated in the case of the fluctuation of pulverized coal preparation system furnace coal weight.Using technical solution of the present invention
The instruction of important control parameter generate the scheme in circuit, actually play the decoupling function of multivariable control system, simplify each
The parameter tuning process work of a loop control system, and the Control platform of control system can reach wanting for relevant criterion
It asks.
The method of the present invention can accurately control the furnace coal weight of boiler in double inlet and outlet coal mill pulverized coal preparation system, feedwater
Amount and air output effectively improve the operational efficiency of unit, improve safety and the economy of unit, and being conducive to promote makes
With.
【Description of the drawings】
Attached drawing is used to provide further understanding of the present invention, and a part for constitution instruction, the reality with the present invention
Example is applied together for explaining the present invention, is not construed as limiting the invention, in the accompanying drawings：
Fig. 1 is the principle of the present invention figure.
Fig. 2 is traditional feedwater, coal amount, air quantity instruction generation schematic diagram.
【Specific embodiment】
With reference to embodiment and compare attached drawing the present invention is described in further detail.It is emphasized that
The description below is only exemplary, the range being not intended to be limiting of the invention and its application.
As shown in Figure 1, a kind of method that water based on unit load instruction, wind instruction generate circuit, unit load instruction
Three kinds of circuits are respectively formed after obtaining boiler command adapted thereto initial value by polygronal function f (x)：
First circuit：Unit load instruction, polygronal function f11 (x), confluent instruction initial value, feed water control system, institute
Unit load in the first circuit is stated to instruct by after polygronal function f11 (x), passing sequentially through lead-lag link, inertial element,
In, dynamic when playing varying duty by lead-lag link adds water function, to adapt to the process of the dynamic refuelling of boiler；It is logical
It is to be matched in time with fuel quantity variation to cross inertial element, and coal-supplying amount step is simulated to steaming by the inertial element
Difference of the generation dynamic characteristic and feedwater step of steam flow amount between steam generation dynamic characteristic；By lead-lag link,
It after inertial element, is re-introduced into centrum's temperature and is corrected by polygronal function f14 (x), introduce centrum's temperature Corrective control
Scheme is relatively simple, intuitive because of centrum's temperature value, and control effect is ideal.It is initial to finally obtain confluent instruction
Value, and act on unit feed water control system.
Second servo loop：Unit load instruction, polygronal function f12 (x), First air wind pressure instruction initial value, primary air pressure
Control system, in the second servo loop unit load instruction led to by after polygronal function f12 (x), first passing through lead-lag link
The purpose for crossing the link is to adjust the quick of coal pulverizer powder bucket memory powder by primary air pressure to increase or decrease, so as to assist capacity
Wind carries the requirement that coal dust ability adapts to unit load variations；After lead-lag link, the instruction of First air wind pressure is obtained just
Initial value, and act on unit primary air pressure Force control system.
Tertiary circuit：Unit load instruction, polygronal function f13 (x), air quantity instruction initial value, air supply control system, it is described
After unit load instruction passes through polygronal function f13 (x) in tertiary circuit, then by lead-lag link, pass through the mesh of the link
Be to meet coal pulverizer first to add the setting of coal after wind and meet the combustion process of burner hearth；After lead-lag link, then
It is corrected by oxygen amount by polygronal function f15 (x), obtains air quantity instruction initial value, and act on unit blasting air control system.
In unit operation, when unit exits coordinated control mode, unit load instruction trace actual generation power, because
And instruction at this time can be fluctuated often, disturbance of the lead-lag link in command drcuit to the control loop of above-mentioned important parameter
Amount will be bigger.For this purpose, the lead-lag link declines in circuit need to even be cancelled.Particularly, feed water circuit is in machine
During group method of operation switching, also need to carry out the of short duration practical confluent of tracking to confluent instruction initial value, to prevent load instruction
During significantly change, confluent instructs initial value mutation, leads to coal and the numerous imbalances of water ratio.
When runback operating mode occurs suddenly for unit, unit is instructed according to the scheduled speed of runback
During rate quickly reduces fuel, since boiler is also there are certain accumulation of heat, feedwater flow at this time should compare normal operation
When feedwater change procedure it is slow, i.e., the time constant of inertial element should be added in confluent instruction initial value generates circuit
It is long, so that boiler heat storage is consistent with the speed that coal pulverizer is cut off, ensure both feedwater and burning in runback work
Static state under condition is with dynamically matching.
In the prior art, as shown in Fig. 2, the ratio between control unit water coal, wind coal is logical by boiler master instruction
Realize, but the once-through boiler unit of the pulverized coal preparation system for double inlet and outlet coal mill is configured, be easy to cause unit water coal, wind coal it
Between it is out of proportion.The method of the present invention avoids the above problem well, accurately controls double inlet and outlet coal mill pulverized coal preparation system
Furnace coal weight, confluent and the air output of middle boiler improve the operational efficiency of unit.
The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, it is impossible to assert
The specific implementation of the present invention is confined to these explanations, for person of an ordinary skill in the technical field, is not departing from
Under the premise of present inventive concept, several simple deduction or replace can also be made, should all be considered as belonging to the present invention by being submitted
The scope of patent protection that determines of claims.
Claims (10)
1. a kind of method that water based on unit load instruction, wind instruction generate circuit, it is characterised in that：Unit load instruction is logical
It crosses after polygronal function f (x) obtains boiler command adapted thereto initial value and is respectively formed three kinds of circuits：
First circuit：Unit load instruction, polygronal function f11 (x), confluent instruction initial value, feed water control system；
Second servo loop：Unit load instruction, polygronal function f12 (x), First air wind pressure instruction initial value, primary air pressure control
System；
Tertiary circuit：Unit load instruction, polygronal function f13 (x), air quantity instruction initial value, air supply control system.
2. the method that the water, wind instruction according to claim 1 based on unit load instruction generate circuit, it is characterised in that：
Before unit load instruction show that confluent instructs initial value by polygronal function f11 (x) in first circuit, in previously-introduced
Between point temperature be corrected.
3. the method that the water, wind instruction according to claim 2 based on unit load instruction generate circuit, it is characterised in that：
The centrum's temperature correction is carried out by polygronal function f14 (x).
4. the method that the water, wind instruction according to claim 1 based on unit load instruction generate circuit, it is characterised in that：
Before unit load instruction obtains air output instruction initial value by polygronal function f13 (x) in the tertiary circuit, previously-introduced oxygen amount
It is corrected.
5. the method that the water, wind instruction according to claim 4 based on unit load instruction generate circuit, it is characterised in that：
The oxygen amount correction is carried out by polygronal function f15 (x).
6. the method that the water, wind instruction according to claim 1 based on unit load instruction generate circuit, it is characterised in that：
After unit load instruction passes through polygronal function f11 (x) in first circuit, lead-lag link, inertial element are passed sequentially through,
Then confluent instruction initial value is obtained.
7. the method that the water, wind instruction according to claim 6 based on unit load instruction generate circuit, it is characterised in that：
Dynamic when the lead-lag link plays varying duty adds water function, to adapt to the process of the dynamic refuelling of boiler.
8. the method that the water, wind instruction according to claim 6 based on unit load instruction generate circuit, it is characterised in that：
The inertial element is to be matched in time with fuel quantity variation, coal-supplying amount step pair is simulated by the inertial element
Difference of the generation dynamic characteristic and feedwater step of steam flow between steam generation dynamic characteristic.
9. the method that the water, wind instruction according to claim 1 based on unit load instruction generate circuit, it is characterised in that：
After unit load instruction passes through polygronal function f12 (x) in the second servo loop, then by lead-lag link, with by primary
Wind pressure adjusts the quick of coal pulverizer powder bucket memory powder and increases or decreases, and is born so as to which capacity wind be assisted to carry coal dust ability adaptation unit
The requirement of lotus variation.
10. the method that the water, wind instruction according to claim 1 based on unit load instruction generate circuit, it is characterised in that：
After unit load instruction passes through polygronal function f13 (x) in the tertiary circuit, then by lead-lag link, to meet coal-grinding
Machine first adds the setting of coal after wind and meets the combustion process of burner hearth.
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| CN201711377679.6A CN108224468A (en) | 2017-12-19 | 2017-12-19 | The method that water based on unit load instruction, wind instruction generate circuit |
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| CN201711377679.6A CN108224468A (en) | 2017-12-19 | 2017-12-19 | The method that water based on unit load instruction, wind instruction generate circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111911950A (en) * | 2020-08-14 | 2020-11-10 | 中国神华能源股份有限公司国华电力分公司 | Boiler water-cooled wall temperature control method and device and electronic equipment |
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| CN111911950A (en) * | 2020-08-14 | 2020-11-10 | 中国神华能源股份有限公司国华电力分公司 | Boiler water-cooled wall temperature control method and device and electronic equipment |
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