CN107101194B - Steam Temperature Control of Boilers - Google Patents
Steam Temperature Control of Boilers Download PDFInfo
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- CN107101194B CN107101194B CN201710455618.0A CN201710455618A CN107101194B CN 107101194 B CN107101194 B CN 107101194B CN 201710455618 A CN201710455618 A CN 201710455618A CN 107101194 B CN107101194 B CN 107101194B
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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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- 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 drum, and primary superheater, level-one attemperator, pendant superheater, second level attemperator, two-stage superheater and the steam collecting container set gradually in boiler drum output steam gas circuit, it influences each other and cooperates by master controller, the first attemperation control module, the second attemperation control module, realize the control to main steam temperature, stablize main steam temperature, reduces the cumulative departure of main steam temperature.The utility model has the advantages that Main Steam Temperature Control is stablized, it is swift in response to interference signal, reduces the influence interfered to main steam, 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 technique
Boiler is most important as one of the three big important equipments (boiler, steam turbine, generator) during thermal power generation
Production equipment be the key that provide power for steam turbine in power plant's operational process.
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 Control platform directly affects the safety and economical operation of entire unit.Due to boiler of power plant
In the process of running, temperature has been approached superheater metal highest bearing temperature to superheater, and vapor (steam) temperature is excessively high to make superheater
Pipeline strength reduces, and service life is reduced, and 10 DEG C~20 DEG C of long-term overtemperature operations, the service life will shorten half, and be in for a long time super
It will cause superheater under temperature to deform and booster, influence its safety；Vapor (steam) temperature is too low, and entire unit thermal efficiency of cycle drops therewith
Low, usual vapor (steam) temperature is every to reduce by 5 DEG C~10 DEG C, and efficiency reduces about 1%.For steam turbine, excessively high main steam temperature
It is excessive and damage to will cause thermal stress that steam turbine high-pressure cylinder turbine is subject to；Too low main steam temperature can make through steam turbine most
The humidity of several sections of blade steam increases afterwards, causes blade wear.In addition, temperature fluctuation will lead to the metal tube of boiler and steam turbine
Road and components generate metal fatigue, also result in the swollen difference variation of turbine cylinder and rotor, or even generate severe shocks, jeopardize machine
The safe operation of group.Therefore the final main steam temperature of superheater outlet must strictly control within the limits prescribed.Usually
It is required that being no more than -10 DEG C~+5 DEG C of rated value, long-play deviation fluctuation range is no more than ± 5 DEG C.Main steam it is specified
Running temperature is usually at 500 DEG C or more.
It will be seen from figure 1 that the main steam system includes sequentially connected pot comprising water supply system and main steam system
Furnace drum, primary superheater, level-one attemperator, pendant superheater, second level attemperator, two-stage superheater and steam collecting container.Two-stage
Attemperator is between two-stage superheater, the purpose is to guarantee vapor (steam) temperatures at different levels in the normal range, guarantees jet chimney not
It is damaged, and final main steam temperature parameter is made to reach the value of requirement.The saturated vapor come out from drum first passes through level-one mistake
Hot device finally exports to obtain required main steam from two-stage superheater using two-stage desuperheating device desuperheat.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.Since boiler vapor liquid level is controlled using the aperture for adjusting main feed valve, boiler feed pump is under power frequency state
Quantitative water supply can guarantee that water supply main pipe water pressure fluctuations are smaller under this mode, two-stage desuperheating device also small to the interference of attemperation water flow
Outlet steam temperature is able to satisfy control and requires, and keeps final main steam temperature deviation little, to realized indirectly to main steam
The control of temperature.But in this mode of operation, because the maximum quantity of steam that boiler generates 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 generated before and after valve, lead to restriction loss too
Greatly.
For the requirement of response national energy-saving consumption reduction, now domestic many boilers are gradually carrying out variable frequency energy saving reforming, i.e., to
Feed pump increases frequency-converter device, then passes through main feed-regulating valve standard-sized sheet according to level imbalance by detecting liquid level of steam drum
Frequency converter automatic adjustment water supply pump frequency control confluent is to control liquid level of steam drum.But this improved method of operation is brought
New problem, in adjustment process, main pipe hydraulic pressure can fluctuate with the variation of Boiler Steam amount, the interference of desuperheat water valve flow
Also it can become larger therewith, each attemperator outlet steam temperature control precision is caused to be deteriorated.Not due to current this control mode
Have and required main steam temperature is directly brought into control system, control section vapor (steam) temperature deviation accumulation each in this way will ultimately result in
It exports main steam temperature and deviates required temperature value.
In real process, when main steam temperature deviates required temperature value range, pass through the final main steam temperature of artificial observation
The value of degree, by the controlling value of each attemperator outlet steam temperature of manually setting stepwise, to indirectly control final main steam temperature
Degree, therefore the requirements for the operators are very high, not only needs relevant professional knowledge abundant, but also must have skilled behaviour
Control is horizontal, if control is not in time, it is also difficult in a short time stablize main steam temperature 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 is not able to satisfy accurate automatic control
Requirement.
Since there is also controlled device inertia and retardance is larger and steam stream during Boiler Steam Temperature Control
Various interference effects, these factor collective effects such as amount, flue gas heat, attemperation water flow fluctuation are more reduced to main steam temperature
The controllability index of degree.Based on above system and defect, but cannot the structure to the system carry out big variation, can not be to boiler
Drum and level-one attemperator, second level attemperator carry out independent water supply, and Boiler Steam Temperature Control defect is unable to get change.
To ensure that the control of main steam temperature reaches safety and stability, it is more and more important that automation control is carried out 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.
Summary of the invention
In view of the above-mentioned problems, the present invention provides a kind of Steam Temperature Control of Boilers, without supplying existing boiler
Water system is changed, and rapidly, main steam temperature is stablized, and temperature error is small, high reliablity for control.
In order to achieve the above objectives, the specific technical solution that the present invention uses 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 in boiler drum and boiler drum output steam gas circuit, level-one attemperator, screen formula mistake
Hot device, second level attemperator, two-stage superheater and steam collecting container are provided with first at the steam outlet of the level-one attemperator
Temperature monitoring is provided with second temperature monitor, the two-stage superheater at the steam outlet of the second level attemperator
Steam outlet is provided with third temperature monitoring, and the water supply system includes water tank, and the water in the water tank is through water supply pump
It is transported to the boiler drum, the water in the water tank is also transported to level-one desuperheat through water supply pump, level-one attemperation water flow valve
Device, the water in the water tank is also transported to the second level attemperator through water supply pump, second level attemperation water flow valve, crucial to exist
In:
The main steam system is additionally provided with main steam control system, which includes master controller,
One attemperation control module and the second attemperation control module；
The master controller obtains the first difference signal Δ T, which is main steam set temperature signal
T and main steam actual temperature signal T0Difference, the master controller exports Main Steam Temperature Control signal T4；
The first attemperation control module obtains the Main Steam Temperature Control signal T4, and to the level-one attemperator
Desuperheating process is controlled, to change the first desuperheat temperature value t of the level-one attemperator output steam1, described first subtracts
Warm control module is also 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 the second level attemperator
Desuperheating process controlled, to change the second desuperheat temperature value t of second level attemperator output steam2, and then change
The secondary superheater steam temperature value t of the two-stage superheater output 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, it is controlled the control to level-one attemperator, second level attemperator as individual control system
System, is respectively intended to fast and stable two-stage desuperheating device outlet steam temperature, the vapor (steam) temperature setting value of second level attemperator is subtracted by level-one
The vapor (steam) temperature of warm device output is given, and level-one attemperator desired temperature is servo-actuated given by master controller.Accumulated error is small, control
Reliably.
Further, the main steam actual temperature signal T0Also influenced by third interference signal g；The main steam system
System is additionally provided with third interference module, and the third interference module acquisition third interferes driving signal D0And it is dry to export the third
Signal g is disturbed, the secondary superheater steam temperature value t of the third interference signal g and third temperature monitoring acquisition3It is poor to make
After obtain the main steam actual temperature signal T0。
Using the above scheme, direct interference control is carried out to main steam temperature using interference signal, it is anti-improves whole system
Interference improves temperature control precision and control reliability.
It further describes, steam flow sensor, the steam flow is installed in the boiler drum equipped at outlet port
Sensor exports steam flow signal, which interferes driving signal as the third of the third interference module
D0。
Main steam temperature has been directly brought into control system by outer ring major loop, has reduced each control section independent control
In the case of deviation accumulation.
It further describes, 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 obtain the second difference signal and export the first attemperation control signal a to described one
Grade attemperation water flow valve, the level-one attemperation water flow valve changes valve opening according to the first attemperation control signal a, to change
Become level-one attemperation water flow, and then changes the first desuperheat temperature value t of the first temperature monitoring acquisition1；Described
One interference module obtain first interference driving 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 mends
Driving 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 obtain second difference signal after successively making difference.
Using the above scheme, when the first interference signal d and the first thermal compensation signal c acts on level-one 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 level-one attemperator desuperheating process to main steam temperature.
It further describes, the first interference driving signal or defeated for level-one 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 level-one attemperation water flow valve
Value；
The first compensation driving signal or the steam stream for level-one attemperator steam outlet described in the two neighboring moment
Signal difference is measured, or flows through the water flow signal difference of the level-one attemperation water flow valve for the two neighboring moment.
Using the above scheme, for different actual conditions, the water flow signal for flowing through level-one attemperation water flow valve is avoided
The steam flow signal difference of difference or level-one attemperator steam outlet is fluctuated caused by desuperheating process, when there are water flows
When measuring difference or quantity of steam difference, compensation and interference appropriate are carried out to the desuperheating process of level-one attemperator, enhancing level-one subtracts
The attemperation control stability of warm device.
It further describes, 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 obtain third difference signal and export the second attemperation control signal b, the second level
Attemperation water flow valve according to the second attemperation control signal b come control valve aperture, to change second level attemperation water flow, into
And change the second desuperheat temperature value t of second level attemperator output steam2, second desuperheat of the second temperature monitor acquisition
Temperature value t2；Second interference module obtains the second interference driving signal, and exports the second interference signal f, and described second steams
Vapour monitoring temperature and the second interference signal f obtain the second desuperheated system temperature signal T after making difference2；Described second mends
It repays module and obtains the second compensation driving 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 obtain the third difference signal after successively making difference.
Using the above scheme, when the second interference signal f and the second thermal compensation signal e acts on second level attemperator, 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.Second level attemperator attemperation control process is weakened to the shadow of main steam temperature
It rings.
It further describes, the second interference driving signal or defeated for second 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 second level attemperation water flow valve
Value；The second compensation driving signal or the steam flow signal for second level attemperator steam outlet described in the two neighboring moment
Difference, or flow through for the two neighboring moment water flow signal difference of the second level attemperation water flow valve.
For different actual conditions, the water flow signal difference for flowing through second level attemperation water flow valve or second level is avoided to subtract
The steam flow signal difference of warm device steam outlet is fluctuated caused by desuperheating process, when there are water flow difference or steam
When measuring difference, compensation and interference appropriate are carried out to the desuperheating process of second level attemperator, enhance the attemperation control of second level attemperator
Stability.
Two control section of Control on Main-steam Temperature is controlled by single inner ring circuit, can quickly eliminate attemperation water flow fluctuation
Main steam temperature caused by equal disturbing factors fluctuates, and makes system fast and stable.It ensure that two control section direct-contact desuperheaters are effectively matched
It closes.Using level-one attemperator outlet steam temperature as the setting value of second level attemperator controller, when interfering, two control sections
Desuperheating water regulating valve can act rapidly, and second level Desuperheating water regulating valve continues movement to cooperate level-one Desuperheating water regulating valve to eliminate later
Disturbance, enables the regulating valve of two-stage direct-contact desuperheater to work 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, balance wherein any level-one direct-contact desuperheater tune as caused by interference
Save the excessive or too small situation of valve load.
Beneficial effects of the present invention: using two-step evolution, single using the control to level-one attemperator, second level attemperator as two
Inner loop control circuit is respectively intended to fast and stable two-stage desuperheating device outlet steam temperature, the vapor (steam) temperature setting of second level attemperator
Value is given by level-one attemperator outlet steam temperature, and level-one attemperator desired temperature is servo-actuated given by master controller.It can be quickly
It eliminates main steam temperature caused by the disturbing factors such as attemperation water flow fluctuation to fluctuate, makes system fast and stable.It ensure that two controls
Section direct-contact desuperheater effectively cooperates.Main steam temperature has been directly brought into control system by outer ring major loop, has been reduced each
Deviation accumulation in the case of control section independent control.
Detailed description of the invention
Fig. 1 is single seat coal-burning boiler main steam production technology schematic diagram of the invention；
Fig. 2 is that main steam of the invention generates process flow chart；
Fig. 3 is control system block diagram of the invention；
Fig. 4 is the double single inner ring cascade control system block diagrams of Boiler Steam Temperature of the invention.
Specific embodiment
Specific embodiment and working principle of the present invention will be described in further detail with reference to the accompanying drawing.
It will be seen from figure 1 that a kind of Steam Temperature Control of Boilers, including main steam system and water supply system.
It can be seen that the main steam system from Fig. 1 and Fig. 2 and be provided with boiler drum and boiler drum output steam
Primary superheater, level-one attemperator, pendant superheater, second level attemperator, the two-stage superheater sum aggregate vapour set gradually in gas circuit
Header is provided with the first temperature monitoring at the steam outlet of the level-one attemperator, in the steaming of the second level attemperator
Vapour equipped at outlet port is provided with second temperature monitor, and the two-stage superheater steam outlet is provided with third temperature monitoring,
Steam flow sensor is installed in the boiler drum equipped at outlet port.
From Fig. 1 and 2 it can also be seen that the water supply system includes water tank, the water in the water tank is conveyed through water supply pump
To the boiler drum, water in the water tank is also transported to level-one attemperator through water supply pump, level-one attemperation water flow valve, and one
Grade attemperation water flow valve is arranged on level-one desuperheat waterpipe, and level-one desuperheat water flow is provided in the level-one desuperheat waterpipe
Quantity sensor.Level-one attemperator described in the water outlet face of level-one desuperheat waterpipe is carried out to by the steam of level-one attemperator
Attemperation control.Water in the water tank is also transported to the second level attemperator through water supply pump, second level attemperation water flow valve, described
Second level attemperation water flow valve is arranged on second level desuperheat waterpipe, is provided with second level desuperheating water in the second level desuperheat waterpipe
Flow sensor.Second level attemperator described in the water outlet face of second level desuperheat waterpipe, to by second level attemperator steam into
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, which is main steam set temperature signal
T and main steam actual temperature signal T0Difference, the master controller exports 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 level-one attemperation water flow valve, the level-one attemperation water flow valve is opened according to the first attemperation control signal a to change valve
Degree to change level-one attemperation water flow, and then changes the first desuperheat temperature value of the first temperature monitoring acquisition
t1；First interference module obtains the first interference driving signal, and exports the first interference signal d, the first steam monitoring
Temperature and the first interference signal d obtain the first desuperheated system temperature signal T after making difference1；First compensating module
The first compensation driving signal is obtained, and exports 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 obtain second difference signal after successively making difference.Wherein main steam temperature control
Signal T processed4As minuend, the first desuperheated system temperature signal T1, the first thermal compensation signal c is 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 obtain third difference signal and export the second attemperation control signal b, and described two
Grade attemperation water flow valve according to the second attemperation control signal b come control valve aperture, to change second level attemperation water flow,
And then change the second desuperheat temperature value t of second level attemperator output steam2, this of second temperature monitor acquisition second subtract
Warm temperature value t2；Second interference module obtains the second interference driving signal, and exports the second interference signal f, and described second
Steam monitoring temperature and the second interference signal f obtain the second desuperheated system temperature signal T after making difference2；Described second
Compensating module obtains the second compensation driving 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 obtain the third difference signal after successively making difference.Wherein,
First desuperheated system temperature signal T1As minuend, the second desuperheated system temperature signal T2, the second thermal compensation signal e is as subtrahend.
From Fig. 4 it can also be seen that the vapor temperature signal of second level attemperator output is the second desuperheated system temperature signal T2,
The steam is transported to two-stage superheater, and steam is exported from two-stage superheater delivery outlet, exported at this time after two-stage superheater is handled
Vapor (steam) temperature value are as follows: secondary superheater steam temperature value t3。
The main steam system is additionally provided with third interference module, the third interference module acquisition third interference driving letter
Number D0And third interference signal g is exported, the secondary superheater of the third interference signal g and third temperature monitoring acquisition
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 drum equipped at outlet port
Sensor exports steam flow signal, which interferes driving signal as the third of the third interference module
D0。
In the present embodiment, the first interference driving signal and the first compensation driving signal are level-one attemperator
The steam flow signal difference Δ D of steam outlet1, the steam flow signal difference Δ D of the level-one attemperator steam outlet1
=D1i-D1(i-1), wherein D1iFor moment tiLevel-one attemperator steam outlet steam flow signal, D1(i-1)For moment ti-1
Level-one attemperator steam outlet steam flow signal.
In the present embodiment, the second interference driving signal and the second compensation driving signal two neighboring moment
The steam flow signal difference Δ D of the second level attemperator steam outlet2, second level attemperator described in the two neighboring moment steams
The steam flow signal difference Δ D of vapour delivery outlet2=D2i-D2(i-1), wherein D2iFor moment tiLevel-one attemperator steam outlet
Steam flow signal, D2(i-1)For moment ti-1Level-one attemperator steam outlet steam flow signal.
It should be pointed out that the above description is not a limitation of the present invention, the present invention is also not limited to the example above,
Variation, modification, addition or the replacement that those skilled in the art are made within the essential scope of the present invention, are also answered
It belongs to the scope of protection 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 setting
There are the primary superheater set gradually in boiler drum and boiler drum output steam gas circuit, level-one attemperator, screen formula overheat
Device, second level attemperator, two-stage superheater and steam collecting container are provided with the first temperature at the steam outlet of the level-one attemperator
Monitor is spent, second temperature monitor is provided at the steam outlet of the second level attemperator, the two-stage superheater steams
Vapour delivery outlet is provided with third temperature monitoring, and the water supply system includes water tank, and the water in the water tank is defeated through water supply pump
It is sent to the boiler drum, the water in the water tank is also transported to level-one attemperator through water supply pump, level-one attemperation water flow valve,
Water in the water tank is also transported to the second level attemperator through water supply pump, second level attemperation water flow valve, it is characterised in that:
The main steam system is additionally provided with main steam control system, which includes master controller, first subtracts
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 set temperature signal T with
Main steam actual temperature signal T0Difference, the master controller exports 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 level-one attemperator
Process is controlled, to change the first desuperheat temperature value t of the level-one attemperator output steam1, the first desuperheat control
Molding block is also 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 the second level attemperator is subtracted
Warm process is controlled, to change the second desuperheat temperature value t of the second level attemperator output steam2, and then described in change
The secondary superheater steam temperature value t of two-stage superheater output 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 influenced by third interference signal g；
The main steam system is additionally provided with third interference module, and the third interference module acquisition third interferes driving signal D0
And the third interference signal g is exported, the secondary superheater of the third interference signal g and third temperature monitoring acquisition
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: exported in the boiler drum
Steam flow sensor is installed, the steam flow sensor exports steam flow signal, which makees at mouthful
Driving signal D is interfered for the third of the third 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 level-one attemperation water flow valve, level-one attemperation water flow valve according to
The first attemperation control signal a changes valve opening, to change level-one attemperation water flow, and then changes the first temperature prison
Survey the first desuperheat temperature value t of device acquisition1；
First interference module obtains the first interference driving signal, and exports the first interference signal d, the first steam monitoring
Temperature and the first interference signal d obtain the first desuperheated system temperature signal T after making difference1；
First compensating module obtains the first compensation driving 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 obtains the second difference letter after successively making difference
Number.
5. Steam Temperature Control of Boilers according to claim 4, it is characterised in that: the first interference driving letter
Number or for level-one attemperator steam outlet described in the two neighboring moment steam flow signal difference, or be the two neighboring moment
Flow through the water flow signal difference of the level-one attemperation water flow valve；
The first compensation driving signal is believed for the steam flow of level-one 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 level-one attemperation water flow valve.
6. Steam Temperature Control of Boilers according to claim 4, it is characterised in that: 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 third
Value signal simultaneously export the second attemperation control signal b, the second level attemperation water flow valve according to the second attemperation control signal b come
Control valve aperture to change second level attemperation water flow, and then changes the second desuperheat of the second level attemperator output steam
Temperature value t2,Second temperature monitor acquires the second desuperheat temperature value t2；
Second interference module obtains the second interference driving signal, and exports the second interference signal f, the second steam monitoring
Temperature and the second interference signal f obtain the second desuperheated system temperature signal T after making difference2；
Second compensating module obtains the second compensation driving 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 obtain the third difference after successively making difference
Signal.
7. Steam Temperature Control of Boilers according to claim 6, it is characterised in that: the second interference driving letter
Number or for second level attemperator steam outlet described in the two neighboring moment steam flow signal difference, or be the two neighboring moment
Flow through the water flow signal difference of the second level attemperation water flow valve；
The second compensation driving signal is believed for the steam flow of second 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 second level attemperation water flow valve.
Priority Applications (1)
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| CN108224406B (en) * | 2018-01-17 | 2019-06-04 | 安徽工业大学 | A kind of autocontrol method of boiler steam temperature |
| CN108303888B (en) * | 2018-02-07 | 2020-11-03 | 广东电网有限责任公司电力科学研究院 | Temperature-reducing water spraying control method and system for main steam temperature of power station boiler |
| CN108954294B (en) * | 2018-05-22 | 2019-09-24 | 哈尔滨工业大学 | Overheater of power generating set/reheater steam temperature feed forward control method |
| CN112303613A (en) * | 2020-10-30 | 2021-02-02 | 西安热工研究院有限公司 | Two-stage superheater desuperheating water system capable of independently fetching water |
| CN113432113A (en) * | 2021-07-15 | 2021-09-24 | 西安热工研究院有限公司 | System and method for adjusting temperature of superheated steam by using coal-fired boiler desuperheating water |
| CN114355996A (en) * | 2021-07-22 | 2022-04-15 | 杭州绿能环保发电有限公司 | Main steam temperature control method and system and electronic equipment |
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