CN109084293B - A kind of three damper adjustment control method of double reheat boiler - Google Patents
A kind of three damper adjustment control method of double reheat boiler Download PDFInfo
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- CN109084293B CN109084293B CN201810882693.XA CN201810882693A CN109084293B CN 109084293 B CN109084293 B CN 109084293B CN 201810882693 A CN201810882693 A CN 201810882693A CN 109084293 B CN109084293 B CN 109084293B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G5/00—Controlling superheat temperature
- F22G5/04—Controlling superheat temperature by regulating flue gas flow, e.g. by proportioning or diverting
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Abstract
The invention discloses a kind of three damper adjustment control methods of double reheat boiler, the aperture of a gas proportioning damper in back-end ductwork by relatively fixing double reheat boiler, while the aperture by adjusting other two gas proportioning damper adjusts single reheat vapor (steam) temperature T1With double reheat vapor (steam) temperature T2.The present invention proposes a set of temperature adjustment logic for being able to satisfy its peak regulation and steam temperature and reaching rated value demand under wide load for double reheat boiler, so that the ability of high efficiency, low coal consumption and flexible modulation not only may be implemented in the double reheat boiler of three flue of tail portion or even the pure damper adjustment of four flues, T can be realized during lifting load0、T1、T2It is fluctuated in setting value section, so that unit reaches nominal parameter in wide load range, and reduces the loss of the unit coal consumption as caused by Temperature Deviation during dynamic lifting load, improves unit economy.
Description
Technical field
The present invention relates to the technical fields of station boiler, more particularly, are related to a kind of three baffle tune of double reheat boiler
Warm control method.
Background technique
In order to further decrease power generation coal unit coal consumption, further develops Filter Tuber For Clean Coal and use technology, it is big to develop high parameter
The double reheat boiler of capacity is a prior development direction.For double reheat boiler, needed compared to single reheat boiler
It controls except main steam condition, single reheat steam parameter, and needs additional control double reheat steam parameter, therefore compared to
Single reheat boiler needs to solve double reheat boiler to main steam temperature T0, single reheat vapor (steam) temperature T1, double reheat steam
Stripping temperature T2Regulation and control.
In existing double reheat boiler technology, the method for temperature control for double reheat boiler reheater includes to swing combustion
Three kinds of modes such as the pure baffle adjusting of burner+twin flue baffle, flue gas recirculation+twin flue baffle, three flues.It is with certain 660MW
It is as shown in table 1 below to three kinds of method of temperature control Character Comparisons for grade double reheat boiler.
The method of temperature control Character Comparison table of certain the 660MW grade double reheat boiler of table 1
Be comprehensively compared it is found that using three baffle of tail portion adjust steam temperature double reheat boiler can be realized bidirectional temp regulation, if
Standby simple and reliable property is high, does not increase unit station service in actual moving process and investment operation and maintenance cost is low, it can be achieved that two
The maximum revenue of secondary reheating.Domestic Energy restructuring at present, the development of generation of electricity by new energy unit is so that traditional coal burning machine
The demand that group needs better flexibility service ability and energy responsive electricity grid is adjusted.
Gas baffle temperature adjustment is and then to change flue gas flow in convection pass by changing baffle opening and adjust hot vapour again
Temperature.Conventional single reheat boiler adjusts reheat steam temperature using two flue gas baffles and has mature adjusting method and logic.And
By taking three flue double reheat boiler of tail portion as an example, tail portion is arranged to form three parallel gas passes, and each flue outlet is respectively arranged cigarette
Gas controllable register reaches steam by changing exhaust gas volumn of the baffle opening adjustment Jing Guo the side flue in actual moving process
Rated temperature.Wherein, when each baffle acts, according to parallel port fluid correlation properties, the flue gas flow of three flues can
It changes, and then the superheated steam of boiler export, single reheat steam and double reheat steam generation is influenced.
Also, the adjustment process that gas proportioning damper adjusts steam temperature is a matched process repeatedly, and the adjusting of baffle
Need one section of phase buffer that can reflect on steam steam temperature, if three flue gas tune after baffle movement with hysteresis quality
Section baffle is freely adjusted, and there is three regulated variables, it may appear that a variety of different baffle opening combinations ambiguity occur and ask
Topic, adjusting just become complicated, adjust logic and are easy confusion, influence thermoregulation effect and can greatly increase regulating time.
Summary of the invention
In order to solve the problems in the existing technology, the object of the present invention is to provide one kind, to can be avoided multiple baffles same
When movement cause different opening combine ambiguity three damper adjustment control method of double reheat boiler.
The present invention provides a kind of three damper adjustment control methods of double reheat boiler, by relatively fixing double reheat
The aperture of a gas proportioning damper in the back-end ductwork of boiler, while the aperture by adjusting other two gas proportioning damper
To adjust single reheat vapor (steam) temperature T1With double reheat vapor (steam) temperature T2。
One embodiment of three damper adjustment control method of double reheat boiler according to the present invention, the double reheat boiler
Back-end ductwork in be set side by side with preceding flue, middle flue, rear pass, economizer, three flues are arranged in three flues
Inside it is respectively arranged once low-temperature reheater, secondary low-temperature reheater and low temperature superheater, wherein the water of each low temperature heating surface
Flat section is arranged close to economizer and is connected respectively with the outlet section of low temperature heating surface, and the outlet of three flues is respectively arranged with pair
The primary low gas proportioning damper of side again of a low-temperature reheater, secondary low-temperature reheater described in Ying Yu and low temperature superheater, two
The secondary low gas proportioning damper of side again and low side gas proportioning damper excessively.
One embodiment of three damper adjustment control method of double reheat boiler according to the present invention, fixed primary low side cigarette again
The aperture of gas controllable register or the secondary low gas proportioning damper of side again, by adjusting low side gas proportioning damper and two excessively respectively
The secondary low gas proportioning damper of side again adjusts low side gas proportioning damper excessively and the primary low gas proportioning damper of side again respectively
Aperture distributes adjusting smoke and adjusts single reheat vapor (steam) temperature T1With double reheat vapor (steam) temperature T2。
One embodiment of three damper adjustment control method of double reheat boiler according to the present invention, is referred to based on unit load
It enables, coal-water ratio is optimized by load change test and determines the primary low gas proportioning damper of side again or secondary low side flue gas again
The aperture preset function of controllable register, using the aperture preset function as the primary low gas proportioning damper of side again or two
The opening degree instruction of the secondary low gas proportioning damper of side again simultaneously determines default opening value, wherein the primary low flue gas of side again adjusts gear
The default opening value of plate or the secondary low gas proportioning damper of side again is relatively fixed in the process of running and only fluctuates in coal quality
It is adjusted according to the actual operation when larger.
One embodiment of three damper adjustment control method of double reheat boiler according to the present invention, is referred to based on unit load
It enables, by adjusting the low aperture control for crossing side gas proportioning damper on the basis of the low default opening value for crossing side gas proportioning damper
Single reheat vapor (steam) temperature T1With double reheat vapor (steam) temperature T2Average steam temperature, wherein with (T1+T2)/2=TRateAs described
The low control main logic for crossing side gas proportioning damper, by single reheat vapor (steam) temperature T1With double reheat vapor (steam) temperature T2Reality
Average steam temperature and the average steam temperature T of settingRateBetween deviation adjusted as the low opening degree instruction for crossing side gas proportioning damper
It saves the low aperture for crossing side gas proportioning damper and realizes the automatic control of average steam temperature.
One embodiment of three damper adjustment control method of double reheat boiler according to the present invention, is referred to based on unit load
It enables, it is logical on the basis of the default opening value of the secondary low gas proportioning damper of side again or the primary low gas proportioning damper of side again
Overregulate the aperture control single reheat of the secondary low gas proportioning damper of side again or the primary low gas proportioning damper of side again
Vapor (steam) temperature T1With double reheat vapor (steam) temperature T2Temperature Deviation, wherein with T1-T2=0 is used as the secondary low side flue gas again
The control main logic of controllable register or the primary low gas proportioning damper of side again, by single reheat vapor (steam) temperature T1With double reheat
Vapor (steam) temperature T2Practical Temperature Deviation adjusted as the secondary low gas proportioning damper of side again or the primary low flue gas of side again
The opening degree instruction of baffle adjusts opening for the secondary low gas proportioning damper of side again or the primary low gas proportioning damper of side again
Degree realizes the automatic control of Temperature Deviation.
One embodiment of three damper adjustment control method of double reheat boiler according to the present invention, which is characterized in that by base
In unit load instruction each gas proportioning damper default opening value as feed-forward signal, according to the actual operation to described
The default opening value of each gas proportioning damper is adjusted.
One embodiment of three damper adjustment control method of double reheat boiler according to the present invention, the double reheat boiler
Boiler is arranged for four flue of tail portion, and one gas proportioning damper is the linkage baffle for being disposed with two flues of same heating surface
Plate, the same heating surface are a low-temperature reheater or secondary low-temperature reheater.
The present invention proposes that a set of its peak regulation and steam temperature of being able to satisfy reaches rated value under wide load for double reheat boiler
The temperature adjustment logic of demand, so that height not only may be implemented in the double reheat boiler of three flue of tail portion or even the pure damper adjustment of four flues
Efficiency, the ability of low coal consumption and flexible modulation, can realize T during lifting load0、T1、T2It is fluctuated in setting value section,
So that unit reaches nominal parameter in wide load range, and reduce during dynamic lifting load due to Temperature Deviation
Caused by unit coal consumption lose, improve unit economy.
Detailed description of the invention
The structure that Fig. 1 shows the double reheat boiler of three flue of tail portion arrangement according to an exemplary embodiment of the present invention is shown
It is intended to.
Fig. 2 shows the control mode signals of the secondary low gas proportioning damper of side again according to an exemplary embodiment of the present
Figure.
Fig. 3 shows the low control mode schematic diagram for crossing side gas proportioning damper according to an exemplary embodiment of the present.
Fig. 4 shows the control mode signal of the primary low gas proportioning damper of side again according to an exemplary embodiment of the present
Figure.
Fig. 5 shows in embodiment certain three flue-pipe boiler of the tail portion 660MW in 30%BMCR~50%BMCR load up process
In reheat steam temperature changing rule.
Fig. 6 shows in embodiment certain three flue-pipe boiler of the tail portion 660MW in 50%BMCR~75%BMCR load up process
In reheat steam temperature changing rule.
Fig. 7 shows in embodiment certain three flue-pipe boiler of the tail portion 660MW in 75%BMCR~100%BMCR load up process
In reheat steam temperature changing rule
Description of symbols:
Flue before 1-, flue, 3- rear pass, the 4- primary low gas proportioning damper of side again, 5- bis- times low side flue gases again in 2-
Controllable register, 6- be low to cross side gas proportioning damper, economizer before 7-, economizer, 10- low temperature is again after economizer, 9- in 8-
Hot device horizontal segment, bis- low-temperature reheater horizontal segments of 11-, 12- low temperature superheater horizontal segment, the low-temperature reheater outlet 13-
Section, bis- low-temperature reheater outlet sections of 14-, 15- low temperature superheater outlet section, 16- packet wall.
Specific embodiment
All features disclosed in this specification or disclosed all methods or in the process the step of, in addition to mutually exclusive
Feature and/or step other than, can combine in any way.
Any feature disclosed in this specification unless specifically stated can be equivalent or with similar purpose by other
Alternative features are replaced.That is, unless specifically stated, each feature is an example in a series of equivalent or similar characteristics
?.
The present invention causes different opening to combine for baffle simultaneously operations more when adjusting steam temperature by baffle in the prior art
Ambiguity studied, find pure damper adjustment under boiler firm demand operating condition, it is fixed in baffle opening
In the case of system when reaching balance, other two baffles finally will appear an aperture combination and adapt to therewith, and this makes it possible to have
The ambiguity that effect avoids three baffle simultaneously operations that different opening is caused to combine, so that being relied on when boiler load changes
Control method of the invention can instruct each executing agency's movement of baffle, simplify the varying duty response for adjusting logic and improving boiler
Ability has preferable practicability and promotional value, is the strong mating control to the double reheat boiler of three flue system of tail portion
Logic.
An exemplary embodiment of the present invention, the three damper adjustment control method of double reheat boiler is by relatively
The aperture of a gas proportioning damper in the back-end ductwork of fixed double reheat boiler, while by adjusting other two flue gas tune
The aperture of baffle is saved to adjust single reheat vapor (steam) temperature T1With double reheat vapor (steam) temperature T2.Wherein, the relatively-stationary cigarette of aperture
Gas controllable register is preferably low-temperature reheater side gas proportioning damper, but is also not excluded for adjusting for low temperature superheater side flue gas and keep off
Plate.
Above-mentioned control method of the invention is suitable for the double reheat boiler of three flue of tail portion arrangement, can equally be well applied to tail
The double reheat boiler of four flue of portion arrangement will be arranged wherein same when double reheat boiler is that four flue of tail portion arranges boiler
The plate washer of two flues of one heating surface links to form linked-baffle, which can be primary low-temperature reheater or two
Secondary low-temperature reheater, then can actually be reduced to three plate washer control methods, and this method is equally applicable.
Next control method of the invention is carried out specifically by taking the double reheat boiler of three flue of tail portion arrangement as an example
It is bright.
The structure that Fig. 1 shows the double reheat boiler of three flue of tail portion arrangement according to an exemplary embodiment of the present invention is shown
It is intended to.
As shown in Figure 1, according to the present invention, flue 1, middle cigarette before being set side by side in the back-end ductwork of the double reheat boiler
Road 2, rear pass 3, three flues are separated by packet wall 16 and inside is arranged with economizer, i.e., are disposed with preceding province in preceding flue 1
Coal device 7 is disposed with middle economizer 8 in middle flue 2, rear economizer 9 is disposed in rear pass 3.
Once low-temperature reheater, secondary low-temperature reheater and low temperature superheater are respectively arranged in three flues, it is each low
The horizontal segment of warm heating surface is arranged close to economizer and is connected respectively with the outlet section of low temperature heating surface, i.e. a cold reheat
Device horizontal segment 10 is connected with a low-temperature reheater outlet section 13, secondary low-temperature reheater horizontal segment 11 and secondary low-temperature reheater
Outlet section 14 is connected, and low temperature superheater horizontal segment 12 is connected with low temperature superheater outlet end section 15.In the present invention, double reheat
A low-temperature reheater, secondary low-temperature reheater, low temperature superheater in boiler may be arranged at any flue in three flues
Interior and position is interchangeable.
The outlet of three flues is respectively arranged with corresponding to a low-temperature reheater, secondary low-temperature reheater and cryogenic overheating
The primary low gas proportioning damper of side again 4, the secondary low gas proportioning damper of side again 5 and the low side gas proportioning damper 6 excessively of device.
When adjusting, the preferably fixed primary low gas proportioning damper of side again 4 or the secondary low gas proportioning damper of side again 5
Aperture low cross side gas proportioning damper 6 and the secondary low gas proportioning damper of side again 5 or adjusts low mistake respectively by adjusting respectively
The aperture of side gas proportioning damper 6 and the primary low gas proportioning damper of side again 4 is steamed to adjust smoke and distribute and adjust single reheat
Stripping temperature T1With double reheat vapor (steam) temperature T2。
In boiler load variation, by keeping the primary low gas proportioning damper of side again 4 or the secondary low flue gas tune of side again
The aperture for saving baffle 5 is constant, passes through the low overall heat absorption (steam temperature) point crossed side gas proportioning damper 6 and adjust superheater and reheater
Match, then adjusts a low temperature again with the corresponding secondary low gas proportioning damper of side again 5 or the primary low gas proportioning damper of side again 4
Heat absorption (steam temperature) deviation of hot device and secondary low-temperature reheater.Wherein, it is carried out according to theoretical calculation and actual motion debugging feedback
The aperture of the default primary low gas proportioning damper of side again 4 or the secondary low gas proportioning damper of side again 5 simultaneously makes its aperture relatively
It is fixed, when actual motion coal quality changes big, default aperture is adjusted according to actual motion, keeps aperture in other situations
It is constant.
For three flue double reheat boiler of tail portion, research and theoretical calculation by analysis, in 30%~100%BMCR
When (boiler maximum continuous rating) load condition changes, the primary low gas proportioning damper of side again 4 or secondary low side flue gas again
The aperture of controllable register 5 can remain unchanged, it is only necessary to which steam temperature adjusting needs can be met by adjusting other two gas proportioning damper.
The specific adjusting logic of three baffles is described in detail below.
According to the present invention, it is instructed based on unit load, coal-water ratio is optimized by load change test and determines primary low side again
The aperture preset function of gas proportioning damper 4 or the secondary low gas proportioning damper of side again 5, using the aperture preset function as one
The opening degree instruction of the secondary low gas proportioning damper of side again 4 or the secondary low gas proportioning damper of side again 5 simultaneously determines default opening value,
In, the default opening value of the primary low gas proportioning damper of side again or the secondary low gas proportioning damper of side again is in the process of running
It relatively fixes and is only adjusted according to the actual operation when coal quality fluctuation is larger.Fig. 2 shows show according to the present invention
The control mode schematic diagram of the secondary low gas proportioning damper of side again, as shown in Figure 2 when specifically adjusting in example property embodiment.
It is similarly instructed based on unit load, passes through tune on the basis of the low default opening value for crossing side gas proportioning damper 6
Save the low aperture control single reheat vapor (steam) temperature T for crossing side gas proportioning damper 61With double reheat vapor (steam) temperature T2Average vapour
Temperature, wherein with (T1+T2)/2=TRateAs the low control main logic for crossing side gas proportioning damper 6, by single reheat steam temperature
Spend T1With double reheat vapor (steam) temperature T2Actual average steam temperature and set average steam temperature TRateBetween deviation as it is low cross side cigarette
The opening degree instruction of gas controllable register 6 adjusts the low aperture for crossing side gas proportioning damper and realizes the automatic control of average steam temperature.
That is, distributing and controlling primary by the low totality heat absorption (steam temperature) for crossing the adjusting superheater of side gas proportioning damper 6 and reheater
Reheat steam temperature T1With double reheat vapor (steam) temperature T2Average steam temperature.Fig. 3 is shown according to an exemplary embodiment of the present
The low control mode schematic diagram for crossing side gas proportioning damper, it is as shown in Figure 3 when specifically adjusting.
Meanwhile the aperture of the primary low gas proportioning damper of side again 4 or the secondary low gas proportioning damper of side again 5 relatively
In the case where fixation, in the default of the corresponding secondary low gas proportioning damper of side again 5 or the primary low gas proportioning damper of side again 4
By adjusting the secondary low gas proportioning damper of side again 5 or the once aperture of the low gas proportioning damper of side again 4 on the basis of opening value
Control single reheat vapor (steam) temperature T1With double reheat vapor (steam) temperature T2Temperature Deviation, wherein with T1-T2=0 as secondary low
The control main logic of side gas proportioning damper 5 or the primary low gas proportioning damper of side again 4 again, by single reheat vapor (steam) temperature T1
With double reheat vapor (steam) temperature T2Practical Temperature Deviation as the secondary low gas proportioning damper of side again 5 or primary low side cigarette again
The opening degree instruction of gas controllable register 4 adjusts the secondary low gas proportioning damper of side again 5 or the primary low gas proportioning damper of side again 4
Aperture realize Temperature Deviation automatic control.That is, passing through the corresponding secondary low gas proportioning damper of side again 5 or primary low
Side gas proportioning damper 4 controls heat absorption (steam temperature) deviation of a low-temperature reheater and secondary low-temperature reheater and controls primary again
Reheat steam temperature T1With double reheat vapor (steam) temperature T2Temperature Deviation.Fig. 4 is shown according to an exemplary embodiment of the present
The control mode schematic diagram of the primary low gas proportioning damper of side again, it is as shown in Figure 4 when specifically adjusting.
Wherein, using the default opening value of above-mentioned each gas proportioning damper based on unit load instruction as feed-forward signal,
The default opening value of each gas proportioning damper is adjusted according to the actual operation, can be improved and adapt to quick response energy
Power accelerates adjustment speed and reduces regulating time.It is determined relatively in addition, optimizing coal-water ratio by load change test during debugging
The aperture preset function of fixed baffle can effectively optimize the load responding of three flue double reheat boiler of tail portion, in case of coal
Qualitative changeization then can adjust coal-water ratio by water spray, only need to adjust the aperture preset function of the relatively fixed baffle at this time, and
The aperture control logic of other two baffles is constant.
It follows that the core concept of control method of the present invention is: overheating steam temperature relies primarily on the side of " ratio of water to coal+water spray "
Formula is simultaneously adjusted by the fixed primary low gas proportioning damper of side again or the secondary low gas proportioning damper of side again, by (T1+T2)/2
=TRate(TRateIt is that the setting of single reheat vapor (steam) temperature and double reheat vapor (steam) temperature is averaged steam temperature) side flue gas tune is crossed as low
The control main logic for saving baffle, by T1-T2=0 is adjusted as the secondary low gas proportioning damper of side again or the primary low flue gas of side again
The control main logic of baffle, it is clear that above-mentioned regulating measure simplifies, and can effectively reduce regulating time.
Control method through the invention can simplify the plate washer tune of three flue of tail portion or four flues arrangement double reheat boiler
Logic is saved, ambiguity is avoided the occurrence of, boiler varying duty responding ability is improved, greatly reduces regulating time, there is preferable reality
With property and promotional value.
Fig. 5~Fig. 7 shows the load up process of certain three flue double reheat boiler three phases of the tail portion 660MW, at this
During a little load ups, after load instruction changes (4MW/min), single reheat temperature and double reheat steam temperature can by
To after disturbance, the adjust automatically of baffle opening is relied on to reach rated value, shows that the control logic of the technology of the present invention is effectively practical, have
Effect improves load responding and the reply flexibility operation of double reheat boiler, adapts to the ability of peak regulation.
By taking certain project as an example, by taking the secondary low gas proportioning damper aperture of side again of relatively fixed middle flue is 42 degree as an example,
The aperture situation of gas proportioning damper is as follows under different load:
Note: it is 0~100 degree that baffle, which adjusts aperture section,.
In conclusion three damper adjustment control method of double reheat boiler of the invention is relatively fixed in a certain baffle opening
In the case where, another two baffle only need to be adjusted, just has fixed baffle opening combination under certain unit load, avoids gear
Plate aperture ambiguity controls problem caused by combining；After coal type change or combustion conditions variation, ratio of water to coal is adjusted accordingly simultaneously
Control system resets the relatively-stationary baffle opening of aperture, that is, is suitable for three flue double reheat boiler of tail portion for coal
The adaptability of operating condition variation can be rapidly reached self-balancing by the control logic of baffle, have after boiler is by external disturbance
Effect reduces wave time.
The invention is not limited to specific embodiments above-mentioned.The present invention, which expands to, any in the present specification to be disclosed
New feature or any new combination, and disclose any new method or process the step of or any new combination.
Claims (6)
1. a kind of three damper adjustment control method of double reheat boiler, which is characterized in that by relatively fixing double reheat pot
The aperture of a gas proportioning damper in the back-end ductwork of furnace, at the same the aperture by adjusting other two gas proportioning damper come
Adjust single reheat vapor (steam) temperature T1With double reheat vapor (steam) temperature T2；It is set side by side in the back-end ductwork of the double reheat boiler
It is equipped with preceding flue, middle flue, rear pass, economizer is arranged in three flues, is respectively arranged in three flues once low
Warm reheater, secondary low-temperature reheater and low temperature superheater, the horizontal segment of each low temperature heating surface be arranged close to economizer and
It is connected respectively with the outlet section of low temperature heating surface, the outlet of three flues is respectively arranged with corresponding to a cold reheat
The primary low gas proportioning damper of side again, the secondary low side gas proportioning damper again of device, secondary low-temperature reheater and low temperature superheater
Side gas proportioning damper is crossed with low, and the fixed primary low gas proportioning damper of side again or the secondary low gas proportioning damper of side again are opened
Degree, by adjust respectively it is low cross side gas proportioning damper and the secondary low gas proportioning damper of side again or adjust respectively low cross side cigarette
The aperture of gas controllable register and the primary low gas proportioning damper of side again distributes adjusting smoke and adjusts single reheat vapor (steam) temperature
T1With double reheat vapor (steam) temperature T2,
Wherein, it is instructed based on unit load, coal-water ratio is optimized by load change test and determines the primary low flue gas tune of side again
The aperture preset function for saving baffle or the secondary low gas proportioning damper of side again, using the aperture preset function as described primary
The opening degree instruction of the low gas proportioning damper of side again or the secondary low gas proportioning damper of side again simultaneously determines default opening value.
2. three damper adjustment control method of double reheat boiler according to claim 1, which is characterized in that described primary low
The default opening value of side gas proportioning damper or the secondary low gas proportioning damper of side again is relatively fixed in the process of running again
And it is only adjusted according to the actual operation when coal quality fluctuation is larger.
3. three damper adjustment control method of double reheat boiler according to claim 1, which is characterized in that negative based on unit
Lotus instruction, by adjusting the low aperture for crossing side gas proportioning damper on the basis of the low default opening value for crossing side gas proportioning damper
Control single reheat vapor (steam) temperature T1With double reheat vapor (steam) temperature T2Average steam temperature, wherein with (T1+T2)/2=TRateAs
The low control main logic for crossing side gas proportioning damper, by single reheat vapor (steam) temperature T1With double reheat vapor (steam) temperature T2's
Actual average steam temperature and the average steam temperature T of settingRateBetween deviation as it is described it is low cross side gas proportioning damper opening degree instruction
To adjust the low aperture for crossing side gas proportioning damper and realize the automatic control of average steam temperature.
4. three damper adjustment control method of double reheat boiler according to claim 1, which is characterized in that negative based on unit
Lotus instruction, on the default opening value basis of the secondary low gas proportioning damper of side again or the primary low gas proportioning damper of side again
The upper aperture control by adjusting the secondary low gas proportioning damper of side again or the primary low gas proportioning damper of side again is primary
Reheat steam temperature T1With double reheat vapor (steam) temperature T2Temperature Deviation, wherein with T1-T2=0 is used as the secondary low side again
The control main logic of gas proportioning damper or the primary low gas proportioning damper of side again, by single reheat vapor (steam) temperature T1With it is secondary
Reheat steam temperature T2Practical Temperature Deviation as the secondary low gas proportioning damper of side again or primary low side flue gas again
The opening degree instruction of controllable register adjusts the secondary low gas proportioning damper of side again or primary low side gas proportioning damper again
Aperture realize Temperature Deviation automatic control.
5. three damper adjustment control method of double reheat boiler according to any one of claim 1 to 4, feature exist
In using the default opening value of each gas proportioning damper instructed based on unit load as feed-forward signal, according to actual motion feelings
Condition is adjusted the default opening value of each gas proportioning damper.
6. three damper adjustment control method of double reheat boiler according to claim 1, which is characterized in that it is described it is secondary again
Heat boiler is that four flue of tail portion arranges boiler, and one gas proportioning damper is two flues for being disposed with same heating surface
Linked-baffle, the same heating surface are a low-temperature reheater or secondary low-temperature reheater.
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|---|---|---|---|---|
| CN109751590A (en) * | 2019-02-28 | 2019-05-14 | 西安交通大学 | Double reheat boiler and attemperation of steam method |
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