CN107101194A - Steam Temperature Control of Boilers - Google Patents
Steam Temperature Control of Boilers Download PDFInfo
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- CN107101194A CN107101194A CN201710455618.0A CN201710455618A CN107101194A CN 107101194 A CN107101194 A CN 107101194A CN 201710455618 A CN201710455618 A CN 201710455618A CN 107101194 A CN107101194 A CN 107101194A
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- steam
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- temperature
- attemperation
- control
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G5/00—Controlling superheat temperature
- F22G5/12—Controlling superheat temperature by attemperating the superheated steam, e.g. by injected water sprays
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
The invention discloses a kind of Steam Temperature Control of Boilers, including water supply system and main steam system, the main steam system is provided with boiler-steam dome, and primary superheater, one-level attemperator, pendant superheater, two grades of attemperators, two-stage superheater and the steam collecting container set gradually in boiler-steam dome output steam gas circuit, influence each other and coordinate by master controller, the first attemperation control module, the second attemperation control module, realize the control to main steam temperature, stable main steam temperature, reduces the cumulative departure of main steam temperature.Beneficial effect：Main Steam Temperature Control is stable, and interference signal is swift in response, and reduces influence of the interference to main steam, and main steam accumulated error is small.
Description
Technical field
The present invention relates to thermal power generation boiler Main Steam Temperature Control technical field, specifically a kind of boiler main steam
Temperature control system.
Background technology
Boiler, as one of three big visual plants (boiler, steam turbine, generator) during thermal power generation, is most important
Production equipment, be the key that power is provided for steam turbine in power plant's running.
In power generation process, main steam (also known as superheated steam) temperature of boiler superheater final stage outlet is boiler controller system
Important control parameter, the quality of its Control platform directly affects safety and the economical operation of whole unit.Due to boiler of power plant
In the process of running, its temperature is close to superheater metal highest bearing temperature, and vapor (steam) temperature is too high to make superheater for superheater
Pipeline strength is reduced, and service life is reduced, and long-term 10~20 DEG C of operations of overtemperature, its life-span will shorten half, overtemperature is in for a long time
Under can cause superheater deform and booster, influence its safety；Vapor (steam) temperature is too low, and whole unit thermal efficiency of cycle is decreased,
Usual vapor (steam) temperature often reduces by 5~10 DEG C, its efficiency reduction about 1%.For steam turbine, too high main steam temperature can be caused
The thermal stress that steam turbine high-pressure cylinder turbine is subject to is excessive and damages；Too low main steam temperature can make last several sections by steam turbine
The humidity increase of blade steam, causes blade wear.In addition, temperature fluctuation can cause boiler and the metallic conduit of steam turbine and zero
Part produces metal fatigue, also results in the swollen difference change of turbine cylinder and rotor, or even produces severe shocks, jeopardizes the peace of unit
Row for the national games.Therefore the final main steam temperature of superheater outlet must be controlled strictly within the limits prescribed.Usually require that not
- the 10 of overrate~+5 DEG C, long-play deviation fluctuation range is no more than ± 5 DEG C.The nominal operating temperature of main steam
Generally more than 500 DEG C.
It will be seen from figure 1 that comprising water supply system and main steam system, the main steam system includes the pot being sequentially connected
Stove drum, primary superheater, one-level attemperator, pendant superheater, two grades of attemperators, two-stage superheater and steam collecting container.Two-stage
Attemperator is located between two-stage superheater, and the purpose is to ensure vapor (steam) temperatures at different levels in normal range (NR), it is ensured that jet chimney is not
It is damaged, and final main steam temperature parameter is reached the value of requirement.The saturated vapor come out from drum first passes through one-level mistake
Hot device, then by two-stage desuperheating device desuperheat, finally exported from two-stage superheater and obtain required main steam.Subtracted by adjusting two-stage
The attemperation water flow of warm device realizes the independent control to each attemperator outlet steam temperature, and the desuperheating water of two-stage desuperheating device comes self-supporting
Jellyfish pipe.Because boiler vapor liquid level is controlled using the aperture of regulation main feed valve, boiler feed pump is under power frequency state
It can guarantee that feed main water pressure fluctuations are smaller under quantitative water supply, this mode, the interference to attemperation water flow is also small, two-stage desuperheating device
Outlet steam temperature can meet control and require, and make final main steam temperature deviation less, so as to realize indirectly to main steam
The control of temperature.But in this mode of operation, because the maximum quantity of steam that boiler is produced is about 220t/h, every boiler feedwater
Pump power is about 1000kW, when main feed-regulating valve not standard-sized sheet, larger pressure difference can be produced before and after valve, cause restriction loss too
Greatly.
For the requirement of response national energy-saving consumption reduction, present domestic many boilers are progressively carrying out variable frequency energy saving reforming, i.e., to
Feed pump increases frequency-converter device, then by main feed-regulating valve standard-sized sheet, by detecting liquid level of steam drum, is passed through according to level imbalance
Frequency converter automatically adjusts feed pump FREQUENCY CONTROL confluent to control liquid level of steam drum.But this improved method of operation is brought
The problem of new, during regulation, main pipe hydraulic pressure can be fluctuated with the change of Boiler Steam amount, the interference of desuperheat water valve flow
Also it can become big therewith, cause each attemperator outlet steam temperature control accuracy to be deteriorated.Due to current this control mode not
Have and required main steam temperature is directly brought into control system, so each control section vapor (steam) temperature deviation accumulation will ultimately result in
Export temperature value needed for main steam temperature deviates.
In real process, when temperature values needed for main steam temperature deviates, pass through the final main steam temperature of manual observation
The value of degree, by the controlling value of each attemperator outlet steam temperature of manually setting stepwise, carrys out the final main steam temperature of indirect control
Degree, therefore the requirement to operating personnel is very high, not only needs abundant relevant professional knowledge, but also must possess skilled behaviour
Control level, if control is not in time, it is also difficult in a short time that main steam temperature is stable within the scope of required temperature, it is clear that
This control mode is difficult to reach the accurate control to main steam temperature.It is domestic at present by consulting relative literature data
Boiler Steam Temperature be substantially using this control mode, i.e., present control mode, which can not be met, accurately to be automatically controlled
Requirement.
Due to also there is controlled device inertia during Boiler Steam Temperature Control and retardance is larger, and steam stream
The various interference effects such as amount, flue gas heat, attemperation water flow fluctuation, these factor collective effects are more reduced to main steam temperature
The controllability index of degree.Based on said system and defect, big variation can not be carried out to the structure of the system again, it is impossible to boiler
Drum and one-level attemperator, two grades of attemperators carry out independent water supply, and Boiler Steam Temperature Control defect can not be changed.
Want to ensure that the control of main steam temperature reaches safety and stability, it is more and more important to carry out Automated condtrol to it.For
How this, realize the stabilization of main steam temperature in steam production process, and improving Main Steam Temperature Control quality has important show
Sincere justice and practical value.
The content of the invention
In view of the above-mentioned problems, the invention provides a kind of Steam Temperature Control of Boilers, without supplying existing boiler
Water system is changed, and control is rapid, and main steam temperature is stable, and temperature error is small, and reliability is high.
To reach above-mentioned purpose, the concrete technical scheme that the present invention is used is as follows：
A kind of Steam Temperature Control of Boilers, including main steam system and water supply system, the main steam system are set
It is equipped with the primary superheater set gradually on boiler-steam dome, and boiler-steam dome output steam gas circuit, one-level attemperator, screen formula mistake
Hot device, two grades of attemperators, two-stage superheater and steam collecting container, first is provided with the steam outlet of the one-level attemperator
Temperature monitoring, second temperature monitor, the two-stage superheater are provided with the steam outlet of two grades of attemperators
Steam outlet is provided with the 3rd temperature monitoring, and the water supply system includes water in water tank, the water tank through the pump that feeds water
The water being transported in the boiler-steam dome, the water tank is also transported to one-level desuperheat through feed water pump, one-level attemperation water flow valve
Water in device, the water tank is also transported to two grades of attemperators through feed water pump, two grades of attemperation water flow valves, and its key exists
In：
The main steam system is additionally provided with main steam control system, and the main steam control system includes master controller, the
One attemperation control module and the second attemperation control module；
The master controller obtains the first difference signal Δ T, and the first difference signal Δ T is main steam design temperature signal
T and main steam actual temperature signal T0Difference, master controller output Main Steam Temperature Control signal T4；
The first attemperation control module obtains the Main Steam Temperature Control signal T4, and to the one-level attemperator
Desuperheating process is controlled, so as to change the first desuperheat temperature value t that the one-level attemperator exports steam1, described first subtracts
Warm control module is always according to the first desuperheat temperature t1Generate the first desuperheated system temperature signal T1；
The second attemperation control module obtains the first desuperheated system temperature signal T1, and to two grades of attemperators
Desuperheating process be controlled, so as to change the second desuperheat temperature value t that two grades of attemperators export steam2, and then change
The two-stage superheater exports the secondary superheater steam temperature value t of steam3, the secondary superheater steam of the two-stage superheater output
Temperature value t3Influence the main steam actual temperature signal T0。
By above-mentioned design, the control to one-level attemperator, two grades of attemperators is controlled as single control system
System, is respectively intended to fast and stable two-stage desuperheating device outlet steam temperature, the vapor (steam) temperature setting value of two grades of attemperators is subtracted by one-level
The vapor (steam) temperature of warm device output gives, and one-level attemperator desired temperature is servo-actuated given by master controller.Accumulated error is small, control
Reliably.
Further, the main steam actual temperature signal T0Also influenceed by the 3rd interference signal g；The main steam system
System is additionally provided with the 3rd interference module, and drive signal D is disturbed in the 3rd interference module collection the 3rd0And it is dry to export the described 3rd
Disturb the secondary superheater steam temperature value t that signal g, the 3rd interference signal g are gathered with the 3rd temperature monitoring3It is poor to make
After obtain the main steam actual temperature signal T0。
Using such scheme, direct interference control is carried out to main steam temperature using interference signal, whole system is improved and resists
Interference, improves temperature control precision and control reliability.
Further describe, steam flow sensor, the steam flow are installed in the boiler-steam dome equipped at outlet port
Sensor exports steam flow signal, and the steam flow signal disturbs drive signal as the 3rd of the 3rd interference module
D0。
Main steam temperature has been directly brought into control system by outer shroud major loop, each control section independent control is reduced
In the case of deviation accumulation.
Further describe, the first attemperation control module includes the first attemperation control device, the first compensating module and the
One interference module, the first attemperation control device obtains the second difference signal and exports the first attemperation control signal a to described one
Level attemperation water flow valve, the one-level attemperation water flow valve changes valve opening according to the first attemperation control signal a, so as to change
Become one-level attemperation water flow, and then change the first desuperheat temperature value t of the first temperature monitoring collection1；Described
One interference module obtain first disturb drive signal, and export the first interference signal d, the first steam monitoring temperature with it is described
First interference signal d obtains the first desuperheated system temperature signal T after making difference1；First compensating module obtains first and mended
Drive signal is repaid, and exports the first thermal compensation signal c, the Main Steam Temperature Control signal T4With the first desuperheated system temperature
Signal T1, the first thermal compensation signal c makees to obtain second difference signal after difference successively.
Using such scheme, when the first interference signal d and the first thermal compensation signal c is acted on one-level attemperator, first subtracts
Temperature controller is reacted rapidly, and master controller, the second attemperation control device also make corresponding response so that two-stage desuperheating
Device outlet steam temperature fast and stable is in same temperature.Weaken influence of the one-level attemperator desuperheating process to main steam temperature.
Further describe, the first interference drive signal or defeated for one-level attemperator steam described in the two neighboring moment
The steam flow signal difference of outlet, or it is poor for the water flow signal that the two neighboring moment flows through the one-level attemperation water flow valve
Value；
The first compensation drive signal or the steam stream for one-level attemperator steam outlet described in the two neighboring moment
Signal difference is measured, or is the water flow signal difference for flowing through the one-level attemperation water flow valve at the two neighboring moment.
Using such scheme, for different actual conditions, it is to avoid flow through the water flow signal of one-level attemperation water flow valve
The fluctuation that the steam flow signal difference of difference or one-level attemperator steam outlet is caused to desuperheating process, when there are current
When measuring difference or quantity of steam difference, appropriate compensation and interference is carried out to the desuperheating process of one-level attemperator, enhancing one-level subtracts
The attemperation control stability of warm device.
Further describe, the second attemperation control system includes the second attemperation control device, the second compensating module and the
Two interference modules, the second attemperation control device obtains the 3rd difference signal and exports the second attemperation control signal b, described two grades
Attemperation water flow valve, come control valve aperture, so as to change two grades of attemperation water flows, enters according to the second attemperation control signal b
And change the second desuperheat temperature value t that two grades of attemperators export steam2, second desuperheat of the second temperature monitor collection
Temperature value t2；Second interference module obtains second and disturbs drive signal, and exports the second interference signal f, and described second steams
Vapour monitoring temperature obtains the second desuperheated system temperature signal T after making difference with the second interference signal f2；Described second mends
Repay module and obtain the second compensation drive signal, and export the second thermal compensation signal e, the first desuperheated system temperature signal T1With institute
State the second desuperheated system temperature signal T2, the second thermal compensation signal e makees to obtain the 3rd difference signal after difference successively.
Using such scheme, when the second interference signal f and the second thermal compensation signal e is acted on two grades of attemperators, second subtracts
Temperature controller is reacted rapidly, and master controller, the first attemperation control device also make corresponding response so that two-stage desuperheating
Device outlet steam temperature fast and stable is in same temperature.Weaken shadow of two grades of attemperator attemperation control processes to main steam temperature
Ring.
Further describe, the second interference drive signal or defeated for two grades of attemperator steam described in the two neighboring moment
The steam flow signal difference of outlet, or it is poor for the water flow signal that the two neighboring moment flows through two grades of attemperation water flow valves
Value；The second compensation drive signal or the steam flow signal for two grades of attemperator steam outlets described in the two neighboring moment
Difference, or be the water flow signal difference for flowing through two grades of attemperation water flow valves at the two neighboring moment.
For different actual conditions, it is to avoid the water flow signal difference for flowing through two grades of attemperation water flow valves or two grades subtract
The fluctuation that the steam flow signal difference of warm device steam outlet is caused to desuperheating process, when there is water-carrying capacity difference or steam
When measuring difference, appropriate compensation and interference is carried out to the desuperheating process of two grades of attemperators, strengthens the attemperation control of two grades of attemperators
Stability.
The control section of Control on Main-steam Temperature two can quickly eliminate attemperation water flow fluctuation by single inner ring circuit controls
Fluctuated Deng main steam temperature caused by disturbing factor, make system fast and stable.It ensure that two control section direct-contact desuperheaters are effectively matched somebody with somebody
Close.Using one-level attemperator outlet steam temperature as two grades of attemperator controllers setting value, when disturbing, two control sections
Desuperheating water regulating valve can be acted rapidly, and two grades of Desuperheating water regulating valve continuation afterwards act to coordinate one-level Desuperheating water regulating valve to eliminate
Disturbance so that the regulating valve of two-stage direct-contact desuperheater can be operated in more satisfactory position, and can be by total disturbance load certainly
It is dynamic reasonably to share on two-stage desuperheating water regulating valve, wherein any one-level direct-contact desuperheater is balanced due to disturbing the tune caused
Save the excessive or too small situation of valve load.
Beneficial effects of the present invention：, will be single as two to the control of one-level attemperator, two grades of attemperators using two-step evolution
Inner ring control loop, is respectively intended to fast and stable two-stage desuperheating device outlet steam temperature, the vapor (steam) temperature setting of two grades of attemperators
Value is given by one-level attemperator outlet steam temperature, and one-level attemperator desired temperature is servo-actuated given by master controller.Can be quick
Eliminate the main steam temperatures caused by disturbing factor such as attemperation water flow fluctuation to fluctuate, make system fast and stable.It ensure that two controls
Section direct-contact desuperheater effectively coordinates.Main steam temperature has been directly brought into control system by outer shroud major loop, reduced each
Deviation accumulation in the case of control section independent control.
Brief description of the drawings
Fig. 1 is the single seat coal-burning boiler main steam production technology schematic diagram of the present invention；
Fig. 2 is the main steam generation process chart of the present invention；
Fig. 3 is the control system block diagram of the present invention
Fig. 4 is the double single inner ring cascade control system block diagrams of Boiler Steam Temperature of the present invention.
Embodiment
The embodiment and operation principle to the present invention are described in further detail below in conjunction with the accompanying drawings.
It will be seen from figure 1 that a kind of Steam Temperature Control of Boilers, including main steam system and water supply system.
The main steam system, which is can be seen that, from Fig. 1 and Fig. 2 is provided with boiler-steam dome, and boiler-steam dome output steam
The primary superheater that is set gradually in gas circuit, one-level attemperator, pendant superheater, two grades of attemperators, two-stage superheaters and collection vapour
Header, the first temperature monitoring is provided with the steam outlet of the one-level attemperator, in the steaming of two grades of attemperators
Vapour equipped at outlet port is provided with second temperature monitor, and the two-stage superheater steam outlet is provided with the 3rd temperature monitoring,
Steam flow sensor is installed in the boiler-steam dome equipped at outlet port.
From Fig. 1 and 2 it can also be seen that the water that the water supply system is included in water tank, the water tank is conveyed through the pump that feeds water
To the boiler-steam dome, the water in the water tank is also transported to one-level attemperator, one through feed water pump, one-level attemperation water flow valve
Level attemperation water flow valve is arranged on one-level desuperheat waterpipe, and one-level desuperheat current are provided with the one-level desuperheat waterpipe
Quantity sensor.The delivery port of one-level desuperheat waterpipe is just to the one-level attemperator, to being carried out by the steam of one-level attemperator
Attemperation control.Water in the water tank is also transported to two grades of attemperators through feed water pump, two grades of attemperation water flow valves, described
Two grades of attemperation water flow valves are arranged on two grades of desuperheat waterpipes, and two grades of desuperheating waters are provided with two grades of desuperheat waterpipes
Flow sensor.The delivery port of two grades of desuperheat waterpipes is just to two grades of attemperators, to entering by the steam of two grades of attemperators
Row attemperation control.
From Fig. 3 and 4 as can be seen that the main steam system is additionally provided with main steam control system, main steam control system
System includes master controller, the first attemperation control module and the second attemperation control module.
The master controller obtains the first difference signal Δ T, and the first difference signal Δ T is main steam design temperature signal
T and main steam actual temperature signal T0Difference, master controller output Main Steam Temperature Control signal T4；
Wherein, from Fig. 4 it can also be seen that the first attemperation control module includes the first attemperation control device, the first compensation
Module and the first interference module, the first attemperation control device obtain the second difference signal and export the first attemperation control signal a
To the one-level attemperation water flow valve, the one-level attemperation water flow valve is opened according to the first attemperation control signal a to change valve
Degree, so as to change one-level attemperation water flow, and then changes the first desuperheat temperature value of the first temperature monitoring collection
t1；First interference module obtains first and disturbs drive signal, and exports the first interference signal d, the first steam monitoring
Temperature obtains the first desuperheated system temperature signal T after making difference with the first interference signal d1；First compensating module
Obtain first and compensate drive signal, and export the first thermal compensation signal c, the Main Steam Temperature Control signal T4Subtract with described first
Warm vapor temperature signal T1, the first thermal compensation signal c makees to obtain second difference signal after difference successively.Wherein main steam temperature control
Signal T processed4It is used as minuend, the first desuperheated system temperature signal T1, the first thermal compensation signal c be used as subtrahend.
From Fig. 4 it can also be seen that the second attemperation control system include the second attemperation control device, the second compensating module and
Second interference module, the second attemperation control device obtains the 3rd difference signal and exports the second attemperation control signal b, described two
Level attemperation water flow valve according to the second attemperation control signal b come control valve aperture, so as to change two grades of attemperation water flows,
And then change the second desuperheat temperature value t that two grades of attemperators export steam2, this of second temperature monitor collection second subtract
Warm temperature value t2；Second interference module obtains second and disturbs drive signal, and exports the second interference signal f, described second
Steam monitoring temperature obtains the second desuperheated system temperature signal T after making difference with the second interference signal f2；Described second
Compensating module obtains second and compensates drive signal, and exports the second thermal compensation signal e, the first desuperheated system temperature signal T1With
The second desuperheated system temperature signal T2, the second thermal compensation signal e makees to obtain the 3rd difference signal after difference successively.Wherein,
First desuperheated system temperature signal T1It is used as minuend, the second desuperheated system temperature signal T2, the second thermal compensation signal e be used as subtrahend.
From Fig. 4 it can also be seen that the vapor temperature signal of two grades of attemperator outputs is the second desuperheated system temperature signal T2,
The steam is transported to two-stage superheater, after steam is handled through two-stage superheater, from the output of two-stage superheater delivery outlet, now exports
Vapor (steam) temperature value be：Secondary superheater steam temperature value t3。
The main steam system is additionally provided with the 3rd interference module, the interference driving letter of the 3rd interference module collection the 3rd
Number D0And export the 3rd interference signal g, the secondary superheater that the 3rd interference signal g is gathered with the 3rd temperature monitoring
Vapor (steam) temperature value t3The main steam actual temperature signal T is obtained after making difference0。
In the present embodiment, steam flow sensor, the steam flow are installed in the boiler-steam dome equipped at outlet port
Sensor exports steam flow signal, and the steam flow signal disturbs drive signal as the 3rd of the 3rd interference module
D0。
In the present embodiment, described first drive signal and the first compensation drive signal is disturbed to be one-level attemperator
The steam flow signal difference Δ D of steam outlet1, the steam flow signal difference Δ D of the one-level attemperator steam outlet1
=D1i-D1(i-1), wherein D1iFor moment tiOne-level attemperator steam outlet steam flow signal, D1(i-1)For moment ti-1
One-level attemperator steam outlet steam flow signal.
In the present embodiment, the second interference drive signal and the second compensation drive signal two neighboring moment
The steam flow signal difference Δ D of two grades of attemperator steam outlets2, two grades of attemperators steamings described in the two neighboring moment
The steam flow signal difference Δ D of vapour delivery outlet2=D2i-D2(i-1), wherein D2iFor moment tiOne-level attemperator steam outlet
Steam flow signal, D2(i-1)For moment ti-1One-level attemperator steam outlet steam flow signal.
It should be pointed out that described above is not limitation of the present invention, the present invention is also not limited to the example above,
What those skilled in the art were made in the essential scope of the present invention changes, is modified, adds or replaces, and also should
Belong to protection scope of the present invention.
Claims (7)
1. a kind of Steam Temperature Control of Boilers, including main steam system and water supply system, the main steam system are set
There are the primary superheater set gradually on boiler-steam dome, and boiler-steam dome output steam gas circuit, one-level attemperator, screen formula overheat
Device, two grades of attemperators, two-stage superheater and steam collecting container, are provided with the first temperature at the steam outlet of the one-level attemperator
Monitor is spent, second temperature monitor is provided with the steam outlet of two grades of attemperators, the two-stage superheater steams
Vapour delivery outlet is provided with the 3rd temperature monitoring, and the water that the water supply system is included in water tank, the water tank is defeated through the pump that feeds water
The water being sent in the boiler-steam dome, the water tank is also transported to one-level attemperator through feed water pump, one-level attemperation water flow valve,
Water in the water tank is also transported to two grades of attemperators through feed water pump, two grades of attemperation water flow valves, it is characterised in that：
The main steam system is additionally provided with main steam control system, and the main steam control system subtracts including master controller, first
Warm control module and the second attemperation control module；
The master controller obtains the first difference signal Δ T, the first difference signal Δ T be main steam design temperature signal T with
Main steam actual temperature signal T0Difference, master controller output Main Steam Temperature Control signal T4；
The first attemperation control module obtains the Main Steam Temperature Control signal T4, and to the desuperheat of the one-level attemperator
Process is controlled, so as to change the first desuperheat temperature value t that the one-level attemperator exports steam1, the first desuperheat control
Molding block is always according to the first desuperheat temperature t1Generate the first desuperheated system temperature signal T1；
The second attemperation control module obtains the first desuperheated system temperature signal T1, and two grades of attemperators are subtracted
Warm process is controlled, so as to change the second desuperheat temperature value t that two grades of attemperators export steam2, and then change described
Two-stage superheater exports the secondary superheater steam temperature value t of steam3, the secondary superheater steam temperature of the two-stage superheater output
Value t3Influence the main steam actual temperature signal T0。
2. Steam Temperature Control of Boilers according to claim 1, it is characterised in that：The main steam actual temperature
Signal T0Also influenceed by the 3rd interference signal g；
The main steam system is additionally provided with the 3rd interference module, and drive signal D is disturbed in the 3rd interference module collection the 3rd0
And export the 3rd interference signal g, the secondary superheater that the 3rd interference signal g is gathered with the 3rd temperature monitoring
Vapor (steam) temperature value t3The main steam actual temperature signal T is obtained after making difference0。
3. Steam Temperature Control of Boilers according to claim 2, it is characterised in that：In boiler-steam dome output
Steam flow sensor is installed, the steam flow sensor exports steam flow signal, and the steam flow signal is made at mouthful
For the 3rd interference drive signal D of the 3rd interference module0。
4. Steam Temperature Control of Boilers according to claim 1 or 2, it is characterised in that：The first desuperheat control
Molding block includes the first attemperation control device, the first compensating module and the first interference module, and the first attemperation control device obtains the
Two difference signals simultaneously export the first attemperation control signal a to the one-level attemperation water flow valve, one-level attemperation water flow valve according to
First attemperation control signal a changes valve opening, so as to change one-level attemperation water flow, and then changes the first temperature prison
Survey the first desuperheat temperature value t of device collection1；
First interference module obtains first and disturbs drive signal, and exports the first interference signal d, the first steam monitoring
Temperature obtains the first desuperheated system temperature signal T after making difference with the first interference signal d1；
First compensating module obtains first and compensates drive signal, and exports the first thermal compensation signal c, the main steam temperature control
Signal T processed4With the first desuperheated system temperature signal T1、First thermal compensation signal c makees to obtain the second difference letter after difference successively
Number.
5. Steam Temperature Control of Boilers according to claim 4, it is characterised in that：The first interference driving letter
Number or be the steam flow signal difference of one-level attemperator steam outlet described in the two neighboring moment, or for the two neighboring moment
Flow through the water flow signal difference of the one-level attemperation water flow valve；
The first compensation drive signal is believed for the steam flow of one-level attemperator steam outlet described in the two neighboring moment
Number difference, or flow through for the two neighboring moment water flow signal difference of the one-level attemperation water flow valve.
6. Steam Temperature Control of Boilers according to claim 4, it is characterised in that：The second attemperation control system
System includes the second attemperation control device, the second compensating module and the second interference module, and it is poor that the second attemperation control device obtains the 3rd
Value signal simultaneously export the second attemperation control signal b, two grades of attemperation water flow valves according to the second attemperation control signal b come
Control valve aperture, so as to change two grades of attemperation water flows, and then changes the second desuperheat that two grades of attemperators export steam
Temperature value t2,Second temperature monitor gathers the second desuperheat temperature value t2；
Second interference module obtains second and disturbs drive signal, and exports the second interference signal f, the second steam monitoring
Temperature obtains the second desuperheated system temperature signal T after making difference with the second interference signal f2；
Second compensating module obtains second and compensates drive signal, and exports the second thermal compensation signal e, first desuperheated system
Temperature signal T1With the second desuperheated system temperature signal T2, the second thermal compensation signal e makees to obtain the 3rd difference after difference successively
Signal.
7. Steam Temperature Control of Boilers according to claim 6, it is characterised in that：The second interference driving letter
Number or be the steam flow signal difference of two grades of attemperator steam outlets described in the two neighboring moment, or for the two neighboring moment
Flow through the water flow signal difference of two grades of attemperation water flow valves；
The second compensation drive signal or the steam flow letter for two grades of attemperator steam outlets described in the two neighboring moment
Number difference, or flow through for the two neighboring moment water flow signal difference of two grades of attemperation water flow valves.
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