CN106247304A - The double reheat boiler shape that a kind of afterbody three flue is arranged - Google Patents
The double reheat boiler shape that a kind of afterbody three flue is arranged Download PDFInfo
- Publication number
- CN106247304A CN106247304A CN201610786640.9A CN201610786640A CN106247304A CN 106247304 A CN106247304 A CN 106247304A CN 201610786640 A CN201610786640 A CN 201610786640A CN 106247304 A CN106247304 A CN 106247304A
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- Prior art keywords
- flue
- secondary wind
- low
- hot secondary
- temperature reheater
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B31/00—Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements of dispositions of combustion apparatus
- F22B31/08—Installation of heat-exchange apparatus or of means in boilers for heating air supplied for combustion
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G7/00—Steam superheaters characterised by location, arrangement, or disposition
- F22G7/12—Steam superheaters characterised by location, arrangement, or disposition in flues
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Air Supply (AREA)
Abstract
The invention discloses the double reheat boiler shape that a kind of afterbody three flue is arranged, belong to station boiler field, including back-end ductwork, back-end ductwork is separated into front flue, middle flue, rear pass, front flue and middle flue are sequentially provided with low-temperature reheater vertical section along flue gas direction, low-temperature reheater horizontal segment, economizer and gas proportioning damper, rear pass is sequentially provided with hot secondary wind heater along flue gas direction, economizer and gas proportioning damper, the hot secondary wind outlet of air preheater connects with the hot secondary wind entrance of hot secondary wind heater, the hot secondary wind outlet of hot secondary wind heater connects with burner hearth.The present invention is absorbed heat, regulates reheat steam temperature and mates between three flues while flue gas resistance satisfied balance first and second is low again, reduces economizer heat absorption and prevents economizer from vaporize, reduces exhaust gas temperature, improves boiler efficiency, reduction unit coal consumption.
Description
Technical field
The invention belongs to station boiler field.
Background technology
The double reheat boiler that existing afterbody three flue is arranged, generally arrange in three flues of its afterbody the lowest again,
Secondary low again with three kinds of heating surfaces of low temperature superheater.But, along with the raising of Boiler Steam parameter, low heat absorption excessively accounts for superheater system
System heat absorption ratio the least (as a example by 630 DEG C of double reheat Items, low cross heat absorption only account for superheater system heat absorption 5%.
Low mistake can be cancelled by suitably increasing the heating surface area shielded and exceeded.But the pot of afterbody three damper regulation reheat steam temperature
Type of furnace formula, need to retain rear pass).The existence of the lowest mistake is only played balance first and second and low is absorbed heat again, regulates reheat steam temperature
With mate the effect of flue gas resistance between three flues.
Low mistake is absorbed heat and little is brought problem as follows:
The lowest cross outlet/economizer entrance flue gas temperature higher (as a example by 630 DEG C of double reheat Items, high load capacity
Low outlet cigarette temperature 520 DEG C excessively), easily cause the low economizer vaporization crossing lower disposed, affect unit safety operation.
2., in order to reduce turbine heat rate, the more conventional project of boiler feed temperature has had lifting by a relatively large margin (with 630 DEG C two
As a example by secondary reheating Items, feed temperature reaches 330 DEG C).In order to not make economizer exit working medium vaporize, the heat absorption of economizer is subject to
Limit, economizer exit cigarette temperature improves, air preheater exhaust gas temperature improves, and causes boiler efficiency to reduce.
Summary of the invention
It is an object of the invention to: propose the double reheat boiler shape that a kind of afterbody three flue is arranged, in satisfied balance
First and second low absorbs heat, regulates reheat steam temperature and mates between three flues while flue gas resistance again, reduces economizer heat absorption and prevents
Economizer vaporizes, and reduces exhaust gas temperature, improves boiler efficiency, reduces unit coal consumption.
The object of the invention is realized by following technical proposals:
The double reheat boiler shape that a kind of afterbody three flue is arranged, including back-end ductwork, back-end ductwork is separated by bag wall
Become three flues arranged side by side, flue, middle flue, rear pass before being respectively, it is characterised in that: front flue and middle flue are along flue gas side
To being sequentially provided with low-temperature reheater vertical section, low-temperature reheater horizontal segment, economizer and gas proportioning damper, rear pass is along flue gas
Direction is sequentially provided with hot secondary wind heater, economizer and gas proportioning damper, the outlet of hot secondary wind and the heat of air preheater
The hot secondary wind entrance connection of secondary wind heater, the hot secondary wind outlet of hot secondary wind heater connects with burner hearth.
The present invention changes the low mistake in existing afterbody three flue double reheat boiler rear pass into hot secondary wind heater, its
Balance first and second can be played equally and low absorb heat, regulate reheat steam temperature and mate the effect of flue gas resistance between three flues again.This
Outward, the hot absorbable heat of secondary wind heater more (as a example by 630 DEG C of double reheat Items, its outlet cigarette temperature can drop
To with the first and second low identical cigarette temperature about 450 DEG C that exports again, even lower), advantageously reduce economizer heat absorption and prevent province's coal
Device vaporizes, and meanwhile, heats secondary wind heat-recoverable, reduces exhaust gas temperature, improve boiler efficiency, reduces unit coal consumption.
As selection, the low-temperature reheater of front flue is a low-temperature reheater, and the low-temperature reheater of middle flue is secondary
Low-temperature reheater.
As selection, the low-temperature reheater of front flue is secondary low-temperature reheater, and the low-temperature reheater of middle flue is once
Low-temperature reheater.
As selection, the hot secondary wind entrance of hot secondary wind heater is located at the flue gas downstream of back-end ductwork, hot secondary wind
The flue gas upstream of back-end ductwork is located in the hot secondary wind outlet of heater.
Aforementioned main formula case of the present invention and each further selection scheme thereof can be this with independent assortment to form multiple schemes
Invention can use and claimed scheme；And the present invention, (each non conflicting selection) select between and and other select between
Can also independent assortment.Those skilled in the art can understand have according to prior art and common knowledge after understanding the present invention program
Multiple combination, is the claimed technical scheme of the present invention, does not do at this exhaustive.
Work process is: fuel and air burn in burner hearth generate flue gas, after upper furnace, horizontal flue, enter
Enter back-end ductwork.Back-end ductwork is separated into three flues arranged side by side by bag wall from front to back, be respectively before flue, middle flue, after
Flue.Corresponding economizer, low-temperature reheater horizontal segment and hot secondary wind heater is arranged in each flue.Each low it is heated again
The horizontal segment in face perpendicular heating surface (vertical section) respectively is connected.Three flue outlets of afterbody are respectively provided with flue gas regulation gear
Plate, 3 baffle plates regulate the steam temperature of single reheat, double reheat respectively.Flue gas is respectively through being arranged in being vertically subject in 3 flues
Hot side, low again, after hot secondary wind heater and economizer, transfer heat to heating surface at different levels, flue gas is cooled, and enters sky
Air preheater.After steam is heated in heating surfaces at different levels, respectively enter in next stage heating surface.The heat two of air preheater outlet
Secondary wind is admitted to after hot secondary wind heater heats further send into burner hearth.
Beneficial effects of the present invention:
1. by the cigarette temperature of cigarette well economizer entrance after hot secondary wind heater reduction afterbody three flue double reheat boiler,
Desirably prevent economizer vaporization；
2. absorb afterbody three flue double reheat boiler more afterbody heat by hot secondary wind heater, be conducive to fall
Low air preheater exhaust gas temperature, improves boiler efficiency.
Accompanying drawing explanation
Fig. 1 is the device schematic flow sheet of the embodiment of the present invention；
Wherein flue before 1 afterbody, flue in 2 afterbodys, 3 afterbody rear pass, 4 gas proportioning dampers (front), 5
Gas proportioning damper (in), 6 gas proportioning dampers (afterwards), 7 economizers (front), 8 economizers (in), 9 economizers
(afterwards), 10 once/secondary low-temperature reheater horizontal segment, 11 2 times/mono-time low-temperature reheater horizontal segment, 12 hot secondary wind
Heater, 13 once/secondary low-temperature reheater vertical section, 14 2 times/mono-time low-temperature reheater vertical section, 15 bag walls,
16-burner hearth, 17-horizontal flue, 121-hot secondary wind entrance, the hot secondary wind of 122-exports.
Detailed description of the invention
Following non-limiting examples is used for the present invention is described.
Embodiment 1:
With reference to shown in Fig. 1, the big arrow of figure hollow core is flue gas flow direction, and solid small arrow is that hot secondary wind flows to.A kind of tail
The double reheat boiler shape that portion three flue is arranged, including back-end ductwork, back-end ductwork by bag wall 15 be separated into three arranged side by side
Flue 2, afterbody rear pass 3 in flue 1, afterbody before flue, respectively afterbody, before afterbody, flue 1 is sequentially provided with along flue gas direction
13, low-temperature reheater horizontal segment 10 of low-temperature reheater vertical section, economizer (front) 7 and gas proportioning damper (front) 4,
In afterbody, flue 2 is sequentially provided with secondary low-temperature reheater vertical section 14, secondary low-temperature reheater horizontal segment 11, saves along flue gas direction
Coal device (in) 8 and gas proportioning damper (in) 5, afterbody rear pass 3 be sequentially provided with along flue gas direction hot secondary wind heater 12, save
Coal device (afterwards) 9 and gas proportioning damper (afterwards) 6, the hot secondary wind outlet of air preheater and the heat two of hot secondary wind heater 12
Secondary wind entrance 121 connects, and the hot secondary wind outlet 122 of hot secondary wind heater 12 connects with burner hearth.Hot secondary wind heater 12
Hot secondary wind entrance 121 be located at the flue gas downstream of back-end ductwork, the hot secondary wind outlet 122 of hot secondary wind heater 12 is located at
The flue gas upstream of back-end ductwork.
Embodiment 2:
With reference to shown in Fig. 1, the present embodiment is substantially the same manner as Example 1, and its difference is: before afterbody, the low temperature of flue 1 is again
Hot device is that secondary low-temperature reheater (is followed successively by secondary low-temperature reheater vertical section 13, secondary low-temperature reheater water along flue gas direction
Flat section 10), in afterbody, the low-temperature reheater of flue 2 is that a low-temperature reheater (is followed successively by a cold reheat along flue gas direction
14, low-temperature reheater horizontal segment 11 of device vertical section).
Embodiment 3:
As a example by 630 DEG C of double reheat Items, BMCR operating mode has the exhaust gas volumn of 30% through afterbody rear pass (3),
The hot secondary wind heating that air preheater is exported by this partial fume.This partial fume temperature is down to 420 DEG C from 735 DEG C, hot secondary wind
It is heated to 478 DEG C from 360 DEG C.
As can be seen from the above table, compared with existing afterbody three flue double reheat boiler, economizer exit of the present invention owes enthalpy
Improve, boiler efficiency improves, beneficially boiler safety, Effec-tive Function.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all essences in the present invention
Any amendment, equivalent and the improvement etc. made within god and principle, should be included within the scope of the present invention.
Claims (4)
1. the double reheat boiler shape that afterbody three flue is arranged, including back-end ductwork, back-end ductwork is separated into by bag wall
Three flues arranged side by side, flue, middle flue, rear pass before being respectively, it is characterised in that: front flue and middle flue are along flue gas direction
Being sequentially provided with low-temperature reheater vertical section, low-temperature reheater horizontal segment, economizer and gas proportioning damper, rear pass is along flue gas side
To being sequentially provided with hot secondary wind heater, economizer and gas proportioning damper, the outlet of hot secondary wind and the heat two of air preheater
The hot secondary wind entrance connection of secondary wind heater, the hot secondary wind outlet of hot secondary wind heater connects with burner hearth.
2. the double reheat boiler shape that afterbody three flue as claimed in claim 1 is arranged, it is characterised in that: front flue low
Temperature reheater is a low-temperature reheater, and the low-temperature reheater of middle flue is secondary low-temperature reheater.
3. the double reheat boiler shape that afterbody three flue as claimed in claim 1 is arranged, it is characterised in that: front flue low
Temperature reheater is secondary low-temperature reheater, and the low-temperature reheater of middle flue is a low-temperature reheater.
4. the double reheat boiler shape that afterbody three flue as claimed in claim 1 is arranged, it is characterised in that: hot secondary wind adds
The hot secondary wind entrance of hot device is located at the flue gas downstream of back-end ductwork, and afterbody is located in the hot secondary wind outlet of hot secondary wind heater
The flue gas upstream of flue.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610786640.9A CN106247304B (en) | 2016-08-31 | 2016-08-31 | A kind of double reheat boiler shape of three flue of tail portion arrangement |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610786640.9A CN106247304B (en) | 2016-08-31 | 2016-08-31 | A kind of double reheat boiler shape of three flue of tail portion arrangement |
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| CN106247304A true CN106247304A (en) | 2016-12-21 |
| CN106247304B CN106247304B (en) | 2019-02-15 |
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| CN201610786640.9A Active CN106247304B (en) | 2016-08-31 | 2016-08-31 | A kind of double reheat boiler shape of three flue of tail portion arrangement |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106765044A (en) * | 2017-01-03 | 2017-05-31 | 华电电力科学研究院 | The system that flue gas in power station boiler multichannel bypasses waste heat classified utilization |
| CN108826347A (en) * | 2018-04-24 | 2018-11-16 | 东方电气集团东方锅炉股份有限公司 | A kind of back-end ductwork arragement construction of double reheat boiler |
| CN109751590A (en) * | 2019-02-28 | 2019-05-14 | 西安交通大学 | Double reheat boiler and attemperation of steam method |
| CN112944323A (en) * | 2020-12-31 | 2021-06-11 | 大唐郓城发电有限公司 | 630 ℃ double reheat boiler three-flue control method |
| CN113432109A (en) * | 2021-06-28 | 2021-09-24 | 东方电气集团东方锅炉股份有限公司 | Double reheating gas boiler |
| 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 |
| CN115095849A (en) * | 2022-06-21 | 2022-09-23 | 西安交通大学 | Main reheat steam temperature coordination control method of double reheat unit |
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| JPH09318005A (en) * | 1996-05-27 | 1997-12-12 | Ishikawajima Harima Heavy Ind Co Ltd | Boiler equipment |
| CN102734808A (en) * | 2012-06-12 | 2012-10-17 | 武汉锅炉集团工程技术有限公司 | Low-odor type reed pulp black liquor combustion boiler and combustion method thereof |
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| CN105889897A (en) * | 2016-01-29 | 2016-08-24 | 中国电力工程顾问集团西北电力设计院有限公司 | Comprehensive recycling system and method of waste heat in thermal power plant |
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2016
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Patent Citations (6)
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| JPH09318005A (en) * | 1996-05-27 | 1997-12-12 | Ishikawajima Harima Heavy Ind Co Ltd | Boiler equipment |
| 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 |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106765044A (en) * | 2017-01-03 | 2017-05-31 | 华电电力科学研究院 | The system that flue gas in power station boiler multichannel bypasses waste heat classified utilization |
| CN108826347A (en) * | 2018-04-24 | 2018-11-16 | 东方电气集团东方锅炉股份有限公司 | A kind of back-end ductwork arragement construction of double reheat boiler |
| CN108826347B (en) * | 2018-04-24 | 2019-10-25 | 东方电气集团东方锅炉股份有限公司 | A kind of back-end ductwork arragement construction of double reheat boiler |
| CN109751590A (en) * | 2019-02-28 | 2019-05-14 | 西安交通大学 | Double reheat boiler and attemperation of steam method |
| CN112944323A (en) * | 2020-12-31 | 2021-06-11 | 大唐郓城发电有限公司 | 630 ℃ double reheat boiler three-flue control method |
| CN113432109A (en) * | 2021-06-28 | 2021-09-24 | 东方电气集团东方锅炉股份有限公司 | Double reheating gas boiler |
| CN113432109B (en) * | 2021-06-28 | 2023-03-07 | 东方电气集团东方锅炉股份有限公司 | Double reheating gas boiler |
| 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 |
| CN115095849A (en) * | 2022-06-21 | 2022-09-23 | 西安交通大学 | Main reheat steam temperature coordination control method of double reheat unit |
| CN115095849B (en) * | 2022-06-21 | 2023-02-28 | 西安交通大学 | Method for coordinately controlling temperature of main reheat steam of double reheat unit |
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| CN106247304B (en) | 2019-02-15 |
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