CN109751590A - Double reheat boiler and attemperation of steam method - Google Patents
Double reheat boiler and attemperation of steam method Download PDFInfo
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- CN109751590A CN109751590A CN201910148604.3A CN201910148604A CN109751590A CN 109751590 A CN109751590 A CN 109751590A CN 201910148604 A CN201910148604 A CN 201910148604A CN 109751590 A CN109751590 A CN 109751590A
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- flue
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- flue gas
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Abstract
The invention discloses a kind of double reheat boiler and attemperation of steam methods, by the way that the high-temperature flue gas of furnace outlet is introduced directly into boiler back end ductwork, and then the method for heating cold reheat steam, the temperature control precision and temperature adjusting sensitivity of reheated steam can be effectively improved.I.e. by adjusting the flow for entering back-end ductwork flue gas, double reheat vapor (steam) temperature is adjusted.Since double reheat boiler has biggish thermal inertia, for the temperature stability contorting for meeting reheated steam in quick load change transient process, the higher flue gas of temperature directly can be introduced directly into boiler back end ductwork, and then realize the quick adjusting of reheat steam temperature.The method of the present invention will effectively improve the quality of reheated steam parameter, that is, the control precision of reheated steam parameter can be improved, and improve double reheat automatic steam control period length, the frequent status of fluctuation.The flow for entering tail flue gas by changing can reduce the frequent swing (or frequent swing of boiler tail baffle) of burner pivot angle, and then be of great significance to the burning of stablizing in Boiler Furnace.
Description
Technical field
The invention belongs to Power Plant Thermal control technology fields, and in particular to double reheat boiler and attemperation of steam method.
Background technique
Double reheat power generation sets have many characteristics, such as efficient, environmental protection, and installation scale increasingly in China, develop by Thermal Power Generation Industry.
However, double reheat power generation sets are since its thermal inertia is more obvious, reheat steam temperature is difficult to control accurately.Especially in underload
When, double reheat vapor (steam) temperature is difficult to reach design value level；In unit transient state shear load, reheat steam temperature control is straight
Connect the safety concerning unit.For this purpose, the research strategy of research double reheat vapor (steam) temperature is particularly important.
Traditional reheated steam method of temperature control is generally the temperature adjustment of burner pivot angle and changes boiler tail flue gas baffle opening
Each self-regulation or joint are adjusted.For double reheat power generation sets, thermal inertia is bigger compared with single reheat unit.Existing two
Secondary reheated steam method of temperature control has flue gas recirculation mode, and using such scheme, unit complexity increases, reheated steam blower
Failure rate is higher, fails fundamentally to solve the critical problems such as reheat steam temperature deficiency.It is steamed fundamentally to solve reheating
The problems such as stripping temperature control deviation is big need to set about from the insufficient root of reheated steam is influenced.Fundamentally, unit reheated steam
The reason of temperature deficiency is that boiler smoke temperature or underfed cause.Especially in varying duty transient process, boiler
Heat itself may be absorbed or be discharged to cold working medium, leads to control that there are deviations with bistable design value to coal, to meet difference
Reheated steam parameter qualification is up to standard under operating condition, need to be adjusted into the flow of back-end ductwork reheated steam, and then accurately adjusts reheating
Vapor (steam) temperature.
Summary of the invention
The present invention exactly solves the problems, such as that double reheat power generation sets reheat steam temperature is difficult to control, and consideration causes reheated steam
Temperature control is difficult to reach the principal element of setting value, seeks out the pot for quickly and effectively improving the parameter quality of boiler export steam
Furnace and control method, the purpose of the present invention is to provide double reheat boiler and attemperation of steam methods, fully ensure that varying duty mistake
The reality output quality of steam control of boiler is up to standard in journey, guarantees between reheat steam temperature and setting value during varying duty
Deviation is small as far as possible, i.e. boiler parameter control is more accurate.
The technical solution used to solve the technical problems of the present invention is that:
A kind of double reheat boiler, including burner hearth 1, high-temperature flue 2, flue gas conditioning device 3, tail portion No.1 flue 4, tail portion
No. two flues 5, the flue 6 of tail portion three, 7, No. two baffles 8 of No.1 baffle and No. three baffles 9；
The burner hearth 1 is connected by flue with tail portion No.1 flue 4, the flue 5 of tail portion two and the flue 6 of tail portion three, furnace
Thorax 1 also distinguishes the flue 5 of tail portion two by high-temperature flue 2 and is connected with the flue 6 of tail portion three；Flue gas is provided on high-temperature flue 2
Regulating device 3；
4 bottom of tail portion No.1 flue is disposed with No.1 baffle 7, and 5 bottom of flue of tail portion two is disposed with No. two baffles
8,6 bottom of flue of tail portion three is disposed with No. three baffles 9.
The attemperation of steam method of a kind of double reheat boiler, by the way that high-temperature flue gas in burner hearth 1 is passed through high temperature cigarette
Road 2 introduces the flue 5 of tail portion two and the flue 6 of tail portion three through flue gas conditioning device 3 respectively, controls using flue gas conditioning device 3
Preparing high-temp flue gas enters the flow of No. three flues 6 of the flue 5 of tail portion two and tail portion, so that reheat steam temperature is controlled；Tool
Steps are as follows for body:
(1) deviation between real-time reheat steam temperature measured value and setting value is obtained
Boiler side single reheat and double reheat vapor (steam) temperature value are obtained by temperature sensor, and seeks its average value work
For reheated steam real-time measurement values:
Tavg=(Trh,1+Trh,2)×0.5
ΔTrh=Tsp-Tavg
In formula: TavgAverage value is measured for reheat steam temperature, DEG C；Trh,1For single reheat vapor (steam) temperature measured value, DEG C；
Trh,2For double reheat vapor (steam) temperature measured value, DEG C；TspFor first and second reheat steam temperature setting value, DEG C；ΔTrhIt is one, two
Secondary reheat steam temperature deviation, DEG C；
(2) PID arithmetic is carried out to reheated steam deviation
The Δ T that will be obtainedrhIt is input to PID regulator, by Tuning PID parameters, obtains output valve, output valve is denoted as Δ
μ；
Δ μ=fPID(ΔTrh)
In formula: Δ μ is valve opening incremental value；
(3) flue gas conditioning device aperture is newly worth
Obtained Δ μ is added to obtain the new aperture of flue gas conditioning device 3 with the former aperture of flue gas conditioning device 3；
μ1=μ0+Δμ
In formula: μ0For the former aperture of flue gas conditioning device 3；
μ1For the new aperture of flue gas conditioning device 3；The new aperture for obtaining flue gas conditioning device 3 realizes double reheat pot
The attemperation of steam process of furnace.
Compared to the prior art compared with, the present invention has the advantage that
1. directly controlling the flue gas flow into boiler back end ductwork, reheat steam temperature is adjusted sensitiveer.
2. the hunting frequency of burner pivot angle can be reduced, and effectively adjust reheat steam temperature.
Detailed description of the invention
Fig. 1 is for structure of the invention layout drawing.
Fig. 2 is the control logic figure for control method of the present invention.
Specific embodiment
The present invention is further described for son with reference to the accompanying drawings and examples.
As shown in Figure 1, a kind of double reheat boiler of the present invention, including burner hearth 1, high-temperature flue 2, flue gas conditioning device 3, tail
Portion's No.1 flue 4, the flue 5 of tail portion two, the flue 6 of tail portion three, 7, No. two baffles 8 of No.1 baffle and No. three baffles 9；
The burner hearth 1 is connected by flue with tail portion No.1 flue 4, the flue 5 of tail portion two and the flue 6 of tail portion three, furnace
Thorax 1 also distinguishes the flue 5 of tail portion two by high-temperature flue 2 and is connected with the flue 6 of tail portion three；Flue gas is provided on high-temperature flue 2
Regulating device 3；
4 bottom of tail portion No.1 flue is disposed with No.1 baffle 7, and 5 bottom of flue of tail portion two is disposed with No. two baffles
8,6 bottom of flue of tail portion three is disposed with No. three baffles 9.
As shown in Fig. 2, a kind of attemperation of steam method of double reheat boiler of the present invention, by by high-temperature flue gas in burner hearth 1
The flue 5 of tail portion two and the flue 6 of tail portion three are introduced through flue gas conditioning device 3 respectively by high-temperature flue 2, using flue gas tune
Regulating device 3 controls the flow that high-temperature flue gas enters No. three flues 6 of the flue 5 of tail portion two and tail portion, so that reheat steam temperature obtains
To control；Specific step is as follows:
(4) deviation between real-time reheat steam temperature measured value and setting value is obtained
Boiler side single reheat and double reheat vapor (steam) temperature value are obtained by temperature sensor, and seeks its average value work
For reheated steam real-time measurement values:
Tavg=(Trh,1+Trh,2)×0.5
ΔTrh=Tsp-Tavg
In formula: TavgAverage value is measured for reheat steam temperature, DEG C；Trh,1For single reheat vapor (steam) temperature measured value, DEG C；
Trh,2For double reheat vapor (steam) temperature measured value, DEG C；TspFor first and second reheat steam temperature setting value, DEG C；ΔTrhIt is one, two
Secondary reheat steam temperature deviation, DEG C；
(5) PID arithmetic is carried out to reheated steam deviation
The Δ T that will be obtainedrhIt is input to PID regulator, by Tuning PID parameters, obtains output valve, output valve is denoted as Δ
μ；
Δ μ=fPID(ΔTrh)
In formula: Δ μ is valve opening incremental value；
(6) flue gas conditioning device aperture is newly worth
Obtained Δ μ is added to obtain the new aperture of flue gas conditioning device 3 with the former aperture of flue gas conditioning device 3；
μ1=μ0+Δμ
In formula: μ0For the former aperture of flue gas conditioning device 3；
μ1For the new aperture of flue gas conditioning device 3.
The new aperture for obtaining flue gas conditioning device 3 realizes the attemperation of steam process of double reheat boiler.
Claims (2)
1. a kind of double reheat boiler, it is characterised in that: including burner hearth (1), high-temperature flue (2), flue gas conditioning device (3), tail
Portion's No.1 flue (4), the flue (5) of tail portion two, the flue (6) of tail portion three, No.1 baffle (7), No. two baffles (8) and No. three gears
Plate (9)；
The burner hearth (1) passes through flue and tail portion No.1 flue (4), the flue (5) of tail portion two and flue (6) phase of tail portion three
Even, also by high-temperature flue (2), the flue (5) of tail portion two is connected burner hearth (1) with the flue (6) of tail portion three respectively；High-temperature flue
(2) flue gas conditioning device (3) are provided on；
Tail portion No.1 flue (4) bottom is disposed with No.1 baffle (7), and flue (5) bottom of tail portion two is disposed with No. two gears
Plate (8), flue (6) bottom of tail portion three are disposed with No. three baffles (9).
2. a kind of attemperation of steam method of double reheat boiler as described in claim 1, it is characterised in that: by by burner hearth
(1) interior high-temperature flue gas introduces the flue (5) of tail portion two and tail portion three through flue gas conditioning device (3) respectively by high-temperature flue (2)
Number flue (6) enters the flue (5) of tail portion two and the flue of tail portion three using flue gas conditioning device (3) control high-temperature flue gas
(6) flow, so that reheat steam temperature is controlled；Specific step is as follows:
(1) deviation between real-time reheat steam temperature measured value and setting value is obtained
Boiler side single reheat and double reheat vapor (steam) temperature value are obtained by temperature sensor, and seeks its average value as again
Hot steam real-time measurement values:
Tavg=(Trh,1+Trh,2)×0.5
ΔTrh=Tsp-Tavg
In formula: TavgAverage value is measured for reheat steam temperature, DEG C；Trh,1For single reheat vapor (steam) temperature measured value, DEG C；Trh,2For
Double reheat vapor (steam) temperature measured value, DEG C；TspFor first and second reheat steam temperature setting value, DEG C；ΔTrhFor first and second reheating
Vapor (steam) temperature deviation, DEG C；
(2) PID arithmetic is carried out to reheated steam deviation
The Δ T that will be obtainedrhIt is input to PID regulator, by Tuning PID parameters, obtains output valve, output valve is denoted as Δ μ；
Δ μ=fPID(ΔTrh)
In formula: Δ μ is valve opening incremental value；
(3) flue gas conditioning device aperture is newly worth
Obtained Δ μ is added to obtain the new aperture of flue gas conditioning device (3) with the former aperture of flue gas conditioning device (3)；
μ1=μ0+Δμ
In formula: μ0For the former aperture of flue gas conditioning device (3)；μ1For the new aperture of flue gas conditioning device (3)；
The new aperture for obtaining flue gas conditioning device (3) realizes the attemperation of steam process of double reheat boiler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910148604.3A CN109751590A (en) | 2019-02-28 | 2019-02-28 | Double reheat boiler and attemperation of steam method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910148604.3A CN109751590A (en) | 2019-02-28 | 2019-02-28 | Double reheat boiler and attemperation of steam method |
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| CN109751590A true CN109751590A (en) | 2019-05-14 |
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ID=66407911
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| CN201910148604.3A Pending CN109751590A (en) | 2019-02-28 | 2019-02-28 | Double reheat boiler and attemperation of steam method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110274219A (en) * | 2019-07-12 | 2019-09-24 | 浙江浙能兰溪发电有限责任公司 | Super critical boiler reheat steam temperature regulating system and method |
| CN114110559A (en) * | 2021-11-12 | 2022-03-01 | 东方电气集团东方锅炉股份有限公司 | Smoke baffle arrangement structure of double reheat boiler and reheat steam temperature control method |
| CN114110558A (en) * | 2021-11-12 | 2022-03-01 | 东方电气集团东方锅炉股份有限公司 | Method for controlling reheating steam temperature of double reheating boiler based on flue gas baffle adjustment |
| CN115095848A (en) * | 2022-06-21 | 2022-09-23 | 西安交通大学 | Steam temperature control method considering dynamic characteristics and variable load rate of secondary reheating unit |
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| CN1594967A (en) * | 2004-06-18 | 2005-03-16 | 清华大学 | Circulation fluidized bed boiler with re-heating |
| CN202501442U (en) * | 2012-02-29 | 2012-10-24 | 东方电气集团东方锅炉股份有限公司 | Boiler with three flues arranged at tail part thereof |
| CN205690371U (en) * | 2016-06-23 | 2016-11-16 | 国网山东省电力公司电力科学研究院 | A kind of device improving station boiler reheater outlet steam temperature |
| CN106247304A (en) * | 2016-08-31 | 2016-12-21 | 东方电气集团东方锅炉股份有限公司 | The double reheat boiler shape that a kind of afterbody three flue is arranged |
| CN108954293A (en) * | 2018-07-17 | 2018-12-07 | 中国大唐集团科学技术研究院有限公司华东分公司 | A kind of double reheat power generation sets Reheated-steam Temperature Control System and method that " graded combination " integrally controls |
| CN109084293A (en) * | 2018-08-06 | 2018-12-25 | 东方电气集团东方锅炉股份有限公司 | A kind of three damper adjustment control method of double reheat boiler |
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2019
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1594967A (en) * | 2004-06-18 | 2005-03-16 | 清华大学 | Circulation fluidized bed boiler with re-heating |
| CN202501442U (en) * | 2012-02-29 | 2012-10-24 | 东方电气集团东方锅炉股份有限公司 | Boiler with three flues arranged at tail part thereof |
| CN205690371U (en) * | 2016-06-23 | 2016-11-16 | 国网山东省电力公司电力科学研究院 | A kind of device improving station boiler reheater outlet steam temperature |
| CN106247304A (en) * | 2016-08-31 | 2016-12-21 | 东方电气集团东方锅炉股份有限公司 | The double reheat boiler shape that a kind of afterbody three flue is arranged |
| CN108954293A (en) * | 2018-07-17 | 2018-12-07 | 中国大唐集团科学技术研究院有限公司华东分公司 | A kind of double reheat power generation sets Reheated-steam Temperature Control System and method that " graded combination " integrally controls |
| CN109084293A (en) * | 2018-08-06 | 2018-12-25 | 东方电气集团东方锅炉股份有限公司 | A kind of three damper adjustment control method of double reheat boiler |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110274219A (en) * | 2019-07-12 | 2019-09-24 | 浙江浙能兰溪发电有限责任公司 | Super critical boiler reheat steam temperature regulating system and method |
| CN114110559A (en) * | 2021-11-12 | 2022-03-01 | 东方电气集团东方锅炉股份有限公司 | Smoke baffle arrangement structure of double reheat boiler and reheat steam temperature control method |
| CN114110558A (en) * | 2021-11-12 | 2022-03-01 | 东方电气集团东方锅炉股份有限公司 | Method for controlling reheating steam temperature of double reheating boiler based on flue gas baffle adjustment |
| CN115095848A (en) * | 2022-06-21 | 2022-09-23 | 西安交通大学 | Steam temperature control method considering dynamic characteristics and variable load rate of secondary reheating unit |
| CN115095848B (en) * | 2022-06-21 | 2023-02-28 | 西安交通大学 | Steam temperature control method considering dynamic characteristics and variable load rate of secondary reheating unit |
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Application publication date: 20190514 |