CN108019735A - A kind of double reheat power generation sets steam blowing out by pressure reduction system and method - Google Patents
A kind of double reheat power generation sets steam blowing out by pressure reduction system and method Download PDFInfo
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- CN108019735A CN108019735A CN201711406704.9A CN201711406704A CN108019735A CN 108019735 A CN108019735 A CN 108019735A CN 201711406704 A CN201711406704 A CN 201711406704A CN 108019735 A CN108019735 A CN 108019735A
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- blowpipe
- steam
- power generation
- superheater
- stage
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/48—Devices for removing water, salt, or sludge from boilers; Arrangements of cleaning apparatus in boilers; Combinations thereof with boilers
- F22B37/486—Devices for removing water, salt, or sludge from boilers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J3/00—Removing solid residues from passages or chambers beyond the fire, e.g. from flues by soot blowers
- F23J3/02—Cleaning furnace tubes; Cleaning flues or chimneys
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G9/00—Cleaning by flushing or washing, e.g. with chemical solvents
Abstract
The invention discloses a kind of double reheat power generation sets steam blowing out by pressure reduction system and method, superheater, high pressure turbine by and single reheat device are considered as one, it is equal to the superheater of single reheat unit, secondary reheater is equal to the reheater part of single reheat unit；Blowpipe, which faces, to be blown door and is arranged on single reheat device outlet port, carries out blowpipe in two stages, first stage string blows superheater, single reheat device system and pipeline；Second stage string blows superheater, single reheat device, secondary reheater system and pipeline.Beneficial effect of the present invention：Double reheat power generation sets single reheat device water capacity is 3 times of superheater or so, the amount of stored heat of boiler when the program substantially increases blowpipe, even exceed with amount of stored heat during capacity drum boiler blowpipe, steam parameter during blowpipe can be greatly reduced, avoid facing and blow the puckery generation of badge.
Description
Technical field
The invention belongs to double reheat power generation sets steam-line blowing technical field, more particularly to a kind of decompression of double reheat power generation sets to steam
Vapour blow pipe system and method.
Background technology
Double reheat power generation sets are low with generating efficiency high (improving 2% or so), coal consumption for power generation compared with single reheat unit
The advantages of (reducing 10g/kwh or so), represent the clean efficient developing direction of coal unit.With more in recent years large capacities
The operation of double reheat power generation sets, indicate China coal electric construction set comprehensively into ultra supercritical double reheat power generation sets head the list of signers when
Generation.
The Construction Practice of double reheat power generation sets shows that it is different from the structure of the steam superheating section of single reheat unit, really
The real workload and difficulty that bigger is brought to engineering construction, this can just be embodied during the steam-line blowing conscientiously.
Due to《Thermal power generation construction project unit steam-line blowing directive/guide》It is secondary not towards the specification of double reheat power generation sets
The blowpipe principle that reheating embrittlement is both referred to single reheat unit in directive/guide carries out blowpipe, voltage stabilizing method, voltage drop method both of which
Respectively there is application.The features such as condition that is needed to have due to voltage stabilizing method blowpipe is more, blowpipe operating mode is unmanageable, use it is less,
Most of project, which all employs, implements relatively simple decompression blowpipe method.
The double reheat power generation sets of existing voltage drop method steam-line blowing, it faces the setting position for blowing door and single reheat unit phase
Together, superheater outlet is all provided in, has summed up two kinds of embodiments.
A kind of scheme is " three-stage process "：I.e. the first stage singly blows superheater until qualification of practicing shooting, second stage string blow over heat
Device and single reheat device are until qualification of practicing shooting, phase III string blow superheater, single reheat device and secondary reheater, until practicing shooting
It is qualified.This scheme eliminates the making and installation of granulating device, but the start and stop of boiler and target practice number are more, and the blowpipe duration is longer.
Another scheme is " two-stage method "：I.e. the first stage singly blows superheater until qualification of practicing shooting, second stage string are blown over
Hot device and whole reheaters (installing granulating device additional between double reheating device), until it is qualified to practice shooting.Double reheating device is considered as by this scheme
One, it is similar with " two-stage method " decompression blowpipe scheme of single reheat unit, but need to make and install bigbore granulating device.
From blowpipe put into practice, either " two-stage method " still " three-stage process ", using the steam parameter calculated (in theory
Amplified in value) blowpipe when, all there is the situation that superheater pipe-blowing coefficient does not reach 1.4 far, therefore, it has to significantly carry
High parameter；And the raising of parameter can give to face and blow door and bring great challenge, usually occur because face blow badge it is puckery interrupt blowpipe
Situation, so as to cause the extension of blowpipe duration.
The content of the invention
The present invention is to solve the above-mentioned problems, it is proposed that a kind of double reheat power generation sets steam blowing out by pressure reduction system and method,
Superheater, high pressure turbine by and single reheat device are considered as one, are equal to the superheater of single reheat unit, by it is secondary again
Hot device is equal to the reheater part of single reheat unit；Blowpipe, which faces, to be blown door and is arranged on single reheat device outlet port, is divided to two
Stage carries out blowpipe, and first stage string blows superheater, single reheat device system and pipeline；Second stage string blows superheater, once
Reheater, secondary reheater system and pipeline.
To achieve these goals, the present invention adopts the following technical scheme that：
The invention discloses a kind of double reheat power generation sets steam blowing out by pressure reduction system, include the blow pipe system in two stages：
The blow pipe system of first stage includes：Sequentially connected superheater system, single reheat device system, target plate and noise reduction
Device, sets to face and blows door in the exit of the single reheat device system；High pressure turbine by pipeline is kept to be in breakthrough status all the time；
The inlet of the single reheat device system is removably installed by granulating device.
Steam flow during first stage blowpipe is：Separator come vapour → superheater system → main steam line and
High pressure turbine by pipeline → granulating device → single reheat device system →, which faces, blows door → target plate → muffler → row's air.
The blow pipe system of second stage includes：Sequentially connected superheater system, single reheat device system, secondary reheater
System, target plate and muffler, set to face and blow door in the exit of the single reheat device system；Keep high pressure turbine by pipeline all the time
In breakthrough status.
Steam flow during second stage blowpipe is：Separator come vapour → superheater system → main steam line and
High pressure turbine by pipeline → single reheat device system →, which faces, blows door → secondary reheater system → target plate → muffler → row's air.
The invention discloses a kind of double reheat power generation sets steam blowing out by pressure reduction method, comprise the following steps：
(1) boiler cold-state water rinses；
(2) the hot flushing of ignition of the boiler；
(3) first stage examination blowpipe：Slowly boost by boiler startup curve, when steam pressure rises to setting pressure, point
It Da Kai not face to blow and carry out examination blowpipe；According to the pipe-blowing coefficient of superheater system during examination blowpipe, formal blowpipe steam parameter is determined；
(4) first stage formal blowpipe：When steam pressure rises to formal blowpipe steam pressure, opening, which is faced, is blowing a progress just
Formula blowpipe；
(5) after the formal blowpipe setting frequency, blowing out；
(6) repeat step (3)-(5), until it is qualified to practice shooting, first stage blowpipe terminates；
(7) blow pipe system by system reconfiguration for second stage；
(8) second stage examination blowpipe：Slowly boost by boiler startup curve, when steam pressure rises to setting pressure, point
It Da Kai not face to blow and carry out examination blowpipe；According to the pipe-blowing coefficient of secondary reheater system during examination blowpipe, formal blowpipe steam is determined
Parameter；
(9) the formal blowpipe of second stage：When steam pressure rises to formal blowpipe steam pressure, opening, which is faced, is blowing a progress just
Formula blowpipe；
(10) after the formal blowpipe setting frequency, blowing out；
(11) repeat step (8)-(10), until it is qualified to practice shooting, second stage blowpipe terminates.
Further, first stage blowpipe flow is：Separator comes vapour → superheater system → main steam line and height
Pressure bypass duct → granulating device → single reheat device system →, which faces, blows door → target plate → muffler → row's air.
Further, second stage blowpipe flow is：Separator comes vapour → superheater system → main steam line and height
Pressure bypass duct → single reheat device system →, which faces, blows door → secondary reheater system → target plate → muffler → row's air.
Beneficial effect of the present invention：
1st, double reheat power generation sets single reheat device water capacity is 3 times of superheater or so, and the program, which substantially increases, blows
The amount of stored heat of boiler during pipe, or even exceeded with amount of stored heat during capacity drum boiler blowpipe, steaming during blowpipe can be greatly reduced
Vapour parameter, avoids facing and blows the puckery generation of badge.
2nd, high pressure turbine by pipeline and major steam line purge at the same time, eliminate high pressure turbine by purging temporary system, save
Material and installation fee；The resistance after superheater is reduced at the same time, helps to improve superheater pipe-blowing coefficient.
3rd, when second stage string blows superheater, single reheat device and secondary reheater, Boiler Steam parameter should be controlled two
Below secondary reheater running parameter, avoid under existing blowpipe mode, the situation of Boiler Steam whole process high parameter, had both reduced and faced
The infringement of door is blown, can also greatly save resource and duration.
4th, due to facing the outlet port blown door and be arranged on single reheat device, single reheat device exists steam all the time during blowpipe
Vapour, avoids the dry combustion method of single reheat device, protects reheater.
5th, granulating device is removably mounted at the entry position of single reheat device system, therefore only needs small-bore collection
Grain device, saves material and process.
6th, single reheat device safety door verifying work can also be arranged in tube blowing stage, and providing safer band for the whole series startup bears
Lotus condition.
Brief description of the drawings
Fig. 1 is depressured blowpipe first stage system for double reheat power generation sets and arranges schematic diagram；
Fig. 2 is depressured blowpipe second stage system for double reheat power generation sets and arranges schematic diagram.
Embodiment
The present invention is further illustrated with embodiment below in conjunction with the accompanying drawings.
In terms of the boiler structure of double reheat power generation sets, due to adding level-one reheater, the heating surface of superheater reduces
More than half, therefore the amount of stored heat of superheater is also greatly reduced.Such consequence is that the steam that boiler heat storage produces is overcoming
Face after blowing a consumption opened, it cannot be guaranteed that pipe-blowing coefficient is more than 1.4 requirement.To ensure that pipe-blowing coefficient is qualified, only
Greatly improve steam parameter.
In terms of the design parameter of double reheat power generation sets single reheat device, the steam of boiler when its operating pressure is all higher than blowpipe
Pressure, this is different from the situation of the steam pressure of boiler when single reheat unit reheater operating pressure is less than blowpipe.
Two point analysis based on more than, the present invention propose the new system and method for double reheat power generation sets voltage drop method blowpipe.
It is mainly characterized by the design of blowpipe temporary system：Done 1. changing and will face to blow door and be arranged on the routine of superheater outlet
Method, will face and blows door and be arranged on the outlet of single reheat device, 2. remove high pressure turbine by valve core, high pressure turbine by pipeline is in during blowpipe
Breakthrough status, regards it as a part for main steam line, 3. granulating device is installed additional in single reheat device inlet, to collect reheater
Impurity in preceding jet chimney, and selected a good opportunity according to impurity collecting amount and remove granulating device.
Blowpipe temporary system includes the main blowpipe flow of two-way：
System such as Fig. 1 all the way, for purging superheater, high pressure turbine by, single reheat device and its jet chimney.Steam flow
It is：Separator carrys out vapour → superheater system → main steam line (pipeline containing high pressure turbine by) → granulating device → single reheat device system
→ face and blow door → target plate device → muffler → row's air.
Two tunnel system such as Fig. 2, for purging secondary reheater and its jet chimney.Steam flow is：Separator come vapour →
Superheater system → main steam line (pipeline containing high pressure turbine by) → single reheat device system → faces and blows door → secondary reheater system
System → target plate device → muffler → row's air.
Other are identical with Normal practice without the blowpipe of the branch system of target practice.
The method of blowpipe：Steam-line blowing is carried out using two benches voltage drop method, first blows system all the way, after qualification of practicing shooting, blowpipe
System reconfiguration is two tunnel systems, then purges two tunnel systems until qualification of practicing shooting.
The key step of blowpipe：
1.1 boiler cold-state water rinse：First opened water rinses, during device entrance water quality Fe 500 μ g/L of ＜ to be separated, stove Water Sproading
To condenser, input precision processing system carries out closed-up water flushing, until separator water quality reaches 100 μ g/L of Fe ＜, cold conditions is rinsed
Terminate.
The hot flushing of 1.2 ignitions of the boiler：Ignition of the boiler heating furnace water, control water-cooling wall outlet temperature are not more than 190 DEG C, lead to
The mode arranged and be combined with precision processing filtering is crossed outside activation system, progressively purification furnace water water quality, as 50 μ g/ of separator water quality Fe ＜
L is hot to rinse qualification.
1.3 first stage tried blowpipe：Slowly boost by boiler startup curve, when steam pressure rises to 2MPa, opening is faced
Blow progress examination blowpipe for the first time.Check expansion, suspension and support stressing conditions and the temporary facility of jet chimney, can meet further
After the requirement for rising parameter, boiler continues to boost, and respectively in 4MPa, 6MPa, carries out examination blowpipe.According to superheater during examination blowpipe
Pipe-blowing coefficient, determines formal blowpipe steam parameter (generally 7-8MPa, 400 DEG C or so).
1.4 first stage formal blowpipe
1.4.1 boiler boost, when steam pressure rises to formal blowpipe steam pressure, opening face blow door to system all the way into
The formal blowpipe of row.Keep being no more than the blowpipe frequency of 4 times per hour, after formal blowpipe 30 times or so, blowing out.Blowing out cooling time
12 it is small when more than, during blowing out to participate in blow pipe system carry out comprehensively check and defect elimination, granulating device is cleared up.
1.4.2 boiler is lighted a fire again, the blowpipe step of 1.3 and 1.4.1 of repetition, after formal blowpipe 30 times or so, is stopped again
Furnace cooling but 12 it is small when more than.Arrange once to practice shooting before blowing out, the cleannes for system of blowing are checked, in favor of the peace of next blowpipe
Row.Granulating device is cleared up during blowing out, if relatively cleaner, granulating device can be removed between this shutdown period, to reduce system
Resistance；Also removed again after first stage blowpipe qualification being remained.
1.4.3 boiler is lighted a fire again, repeats the blowpipe step of 1.3 and 1.4.1, until it is qualified to practice shooting, first stage blowpipe
Terminate.
Blow pipe system reconfiguration is two tunnel system connection modes by 1.5.
1.6 second stage try blowpipe：Slowly boost by boiler startup curve, when steam pressure rises to 1MPa, opening is faced
Blow progress examination blowpipe for the first time.Check expansion, suspension and support stressing conditions and the temporary facility of jet chimney, after all going well,
Boiler continues to boost, and respectively in 1.5MPa, 2MPa, carries out examination blowpipe.According to examination blowpipe when secondary reheater pipe-blowing coefficient,
Determine formal blowpipe steam parameter (generally 3MPa, 400 DEG C or so).
The formal blowpipe of 1.7 second stage
1.7.1 boiler boost, when steam pressure rises to formal blowpipe steam pressure, opening face blow bis- tunnel systems of Men Dui into
The formal blowpipe of row.Control boiler combustion, keep being no more than per hour the blowpipe frequency of 4 times, after formal blowpipe 15 times or so, stop
Stove.This stage, the method that also voltage stabilizing decompression can be used to combine carried out blowpipe according to unit moisturizing and combustion case.When blowing out cools down
Between 12 it is small when more than, during blowing out to participate in blow pipe system carry out comprehensively check and defect elimination.
1.7.2 boiler is lighted a fire again, the blowpipe step of 1.6 and 1.7.1 of repetition, after formal blowpipe 15 times or so, is stopped again
Furnace cooling but 12 it is small when more than.Arrange once to practice shooting before blowing out, the cleannes for system of blowing are checked, in favor of the peace of next blowpipe
Row.
1.7.3 boiler is lighted a fire again, repeats the blowpipe step of 1.6 and 1.7.1, until it is qualified to practice shooting, second stage blowpipe
Terminate.
Although above-mentioned be described the embodiment of the present invention with reference to attached drawing, model not is protected to the present invention
The limitation enclosed, those skilled in the art should understand that, on the basis of technical scheme, those skilled in the art are not
Need to make the creative labor the various modifications that can be made or deformation still within protection scope of the present invention.
Claims (8)
1. a kind of double reheat power generation sets steam blowing out by pressure reduction system, including sequentially connected superheater system, single reheat device system
System, target plate and muffler, it is characterised in that set to face in the exit of the single reheat device system and blow door；Keep by high pressure
Road pipeline is in breakthrough status all the time.
A kind of 2. double reheat power generation sets steam blowing out by pressure reduction system as claimed in claim 1, it is characterised in that it is described once
The inlet of reheater system is removably installed by granulating device.
3. a kind of double reheat power generation sets steam blowing out by pressure reduction system as claimed in claim 2, it is characterised in that during blowpipe
Steam flow be：Separator comes vapour → superheater system → main steam line and high pressure turbine by pipeline → granulating device → once
Reheater system → face and blow door → target plate → muffler → row's air.
4. a kind of double reheat power generation sets steam blowing out by pressure reduction system as claimed in claim 1, it is characterised in that carry out second-order
During section blowpipe, face increase secondary reheater system between door and target plate of blowing described.
5. a kind of double reheat power generation sets steam blowing out by pressure reduction system as claimed in claim 4, it is characterised in that during blowpipe
Steam flow be：Separator comes vapour → superheater system → main steam line and high pressure turbine by pipeline → single reheat device system
Unite → face and blow door → secondary reheater system → target plate → muffler → row's air.
A kind of 6. double reheat power generation sets steam blowing out by pressure reduction method, it is characterised in that comprise the following steps：
(1) boiler cold-state water rinses；
(2) the hot flushing of ignition of the boiler；
(3) first stage examination blowpipe：Slowly boost by boiler startup curve, when steam pressure rises to setting pressure, beat respectively
Open to face to blow and carry out examination blowpipe；According to the pipe-blowing coefficient of superheater system during examination blowpipe, formal blowpipe steam parameter is determined；
(4) first stage formal blowpipe：When steam pressure rises to formal blowpipe steam pressure, opening, which faces to blow, is formally blown
Pipe；
(5) after the formal blowpipe setting frequency, blowing out；
(6) repeat step (3)-(5), until it is qualified to practice shooting, first stage blowpipe terminates；
(7) system by system reconfiguration for second stage blowpipe；
(8) second stage examination blowpipe：Slowly boost by boiler startup curve, when steam pressure rises to setting pressure, beat respectively
Open to face to blow and carry out examination blowpipe；According to the pipe-blowing coefficient of secondary reheater system during examination blowpipe, formal blowpipe steam parameter is determined；
(9) the formal blowpipe of second stage：When steam pressure rises to formal blowpipe steam pressure, opening, which faces to blow, is formally blown
Pipe；
(10) after the formal blowpipe setting frequency, blowing out；
(11) repeat step (8)-(10), until it is qualified to practice shooting, second stage blowpipe terminates.
7. a kind of double reheat power generation sets steam blowing out by pressure reduction method as claimed in claim 6, it is characterised in that the first stage blows
Pipe flow is：Separator comes vapour → superheater system → main steam line and high pressure turbine by pipeline → granulating device → single reheat
Device system → face and blow door → target plate → muffler → row's air.
8. a kind of double reheat power generation sets steam blowing out by pressure reduction method as claimed in claim 6, it is characterised in that second stage is blown
Pipe flow is：Separator come vapour → superheater system → main steam line and high pressure turbine by pipeline → single reheat device system →
Face and blow door → secondary reheater system → target plate → muffler → row's air.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711406704.9A CN108019735B (en) | 2017-12-22 | 2017-12-22 | Pressure-reducing steam blowpipe system and method for secondary reheating unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711406704.9A CN108019735B (en) | 2017-12-22 | 2017-12-22 | Pressure-reducing steam blowpipe system and method for secondary reheating unit |
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| Publication Number | Publication Date |
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| CN108019735A true CN108019735A (en) | 2018-05-11 |
| CN108019735B CN108019735B (en) | 2023-08-18 |
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ID=62074427
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112146079A (en) * | 2020-09-22 | 2020-12-29 | 山东中实易通集团有限公司 | Supercritical unit pressure reduction blowing pipe system and method |
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|---|---|
| CN108019735B (en) | 2023-08-18 |
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