CN106247304B - A kind of double reheat boiler shape of three flue of tail portion arrangement - Google Patents
A kind of double reheat boiler shape of three flue of tail portion arrangement Download PDFInfo
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- CN106247304B CN106247304B CN201610786640.9A CN201610786640A CN106247304B CN 106247304 B CN106247304 B CN 106247304B CN 201610786640 A CN201610786640 A CN 201610786640A CN 106247304 B CN106247304 B CN 106247304B
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- Prior art keywords
- flue
- secondary air
- low
- hot secondary
- tail portion
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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)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Air Supply (AREA)
Abstract
The invention discloses a kind of double reheat boiler shapes of three flue of tail portion arrangement, belong to station boiler field, including back-end ductwork, back-end ductwork is separated into preceding flue, middle flue, rear pass, preceding flue and middle flue are successively arranged low-temperature reheater vertical section along flue gas direction, low-temperature reheater horizontal segment, economizer and gas proportioning damper, rear pass is successively arranged hot Secondary Air heater along flue gas direction, economizer and gas proportioning damper, the hot Secondary Air outlet of air preheater is connected to the hot Secondary Air entrance of hot Secondary Air heater, the hot Secondary Air outlet of hot Secondary Air heater is connected to burner hearth.For the present invention while meeting that balance first and second is low to absorb heat again, adjusts reheat steam temperature with flue gas resistance between three flues match, reducing economizer heat absorption prevents economizer from vaporizing, and reduces exhaust gas temperature, raising boiler efficiency, reduction unit coal consumption.
Description
Technical field
The invention belongs to station boiler fields.
Background technique
The double reheat boiler of existing three flue of tail portion arrangement, in the flue of tail portion three usually arrangement it is primary it is low again,
It is secondary it is low again with three kinds of heating surfaces of low temperature superheater.However, low heat absorption excessively accounts for superheater system with the raising of Boiler Steam parameter
Unite heat absorption ratio very little (by taking 630 DEG C of double reheat Items as an example, it is 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 three damper of tail portion adjusting reheat steam temperature
Type of furnace formula need to retain rear pass).The largely presence of low mistake only plays balance first and second and low absorb heat again, adjusts reheat steam temperature
With the effect for matching flue gas resistance between three flues.
Low mistake, which is absorbed heat, small brings problem as follows:
1. it is low cross outlet/economizer entrance flue gas temperature it is higher (by taking 630 DEG C of double reheat Items as an example, high load capacity
It is low to cross 520 DEG C of outlet smoke temperature), easily cause the low economizer vaporization for crossing lower disposed, influences unit safety operation.
2. in order to reduce turbine heat rate, boiler feed temperature has promotion by a relatively large margin (with 630 DEG C two compared with conventional project
For secondary reheating Items, feed temperature is up to 330 DEG C).In order not to vaporize economizer exit working medium, the heat absorption of economizer by
Limit, economizer exit smoke temperature improves, air preheater exhaust gas temperature improves, and boiler efficiency is caused to reduce.
Summary of the invention
It is an object of the invention to: it proposes a kind of double reheat boiler shape of three flue of tail portion arrangement, is balanced meeting
First and second is low while absorb heat again, adjust reheat steam temperature with flue gas resistance between three flues is matched, and reducing economizer heat absorption prevents
Economizer vaporization, reduces exhaust gas temperature, improves boiler efficiency, reduces unit coal consumption.
The object of the invention is realized by following technical proposals:
A kind of double reheat boiler shape of three flue of tail portion arrangement, including back-end ductwork, back-end ductwork are separated by packet wall
At three flues arranged side by side, respectively preceding flue, middle flue, rear pass, it is characterised in that: preceding flue and middle flue are along flue gas side
To low-temperature reheater vertical section, low-temperature reheater horizontal segment, economizer and gas proportioning damper is successively arranged, rear pass is along flue gas
Direction is successively arranged hot Secondary Air heater, economizer and gas proportioning damper, the outlet of hot Secondary Air and the heat of air preheater
The hot Secondary Air entrance of Secondary Air heater is connected to, and the hot Secondary Air outlet of hot Secondary Air heater is connected to burner hearth.
Low mistake in existing three flue double reheat boiler rear pass of tail portion is changed to hot Secondary Air heater by the present invention,
Can equally play the role of balance first and second it is low absorb heat again, adjust reheat steam temperature with match flue gas resistance between three flues.This
Outside, more (by taking 630 DEG C of double reheat Items as an example, outlet smoke temperature can drop the hot absorbable heat of Secondary Air heater
450 DEG C or so of identical smoke temperature are exported again to low with first and second, even lower), advantageously reducing economizer heat absorption prevents province's coal
Device vaporization, meanwhile, Secondary Air heat-recoverable is heated, exhaust gas temperature is reduced, improves boiler efficiency, reduces unit coal consumption.
Alternatively, the low-temperature reheater of preceding flue is a low-temperature reheater, and the low-temperature reheater of middle flue is secondary
Low-temperature reheater.
Alternatively, the low-temperature reheater of preceding flue is secondary low-temperature reheater, and the low-temperature reheater of middle flue is primary
Low-temperature reheater.
Alternatively, the hot Secondary Air entrance of hot Secondary Air heater is set to the flue gas downstream of back-end ductwork, hot Secondary Air
The hot Secondary Air outlet of heater is set to the flue gas upstream of back-end ductwork.
The foregoing main solution of the present invention and further alternatives thereof can be freely combined to form multiple schemes, be this
Invention can be used and claimed scheme；And it is of the invention, between (each non conflicting selection) selection and between other selections
It can also be freely combined.Those skilled in the art, which can be illustrated after understanding the present invention program according to the prior art and common knowledge, to be had
Multiple combinations are the claimed technical solution of the present invention, do not do exhaustion herein.
The course of work are as follows: fuel and air are burnt the flue gas of generation in burner hearth, after upper furnace, horizontal flue, into
Enter back-end ductwork.Back-end ductwork is separated into three flues arranged side by side by packet wall from front to back, respectively before flue, middle flue, after
Flue.The corresponding economizer of arrangement, low-temperature reheater horizontal segment and hot Secondary Air heater in each flue.It is each low to be heated again
The horizontal segment in face distinguishes perpendicular heating surface (vertical section) and is connected.The flue outlet of tail portion three is respectively set flue gas and adjusts gear
Plate, 3 baffles adjust the steam temperature of single reheat, double reheat respectively.Flue gas respectively through being arranged in 3 flues it is vertical by
Hot face, it is low again, after hot Secondary Air heater and economizer, transfer heat to heating surfaces at different levels, flue gas is cooled, into 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 Air heater further heats and is sent into burner hearth.
Beneficial effects of the present invention:
1. the smoke temperature of cigarette well economizer entrance after three flue double reheat boiler of tail portion is reduced by hot Secondary Air heater,
It is beneficial to prevent economizer vaporization；
2. absorbing the three more tail portion heats of flue double reheat boiler of tail portion by hot Secondary Air heater, be conducive to drop
Low air preheater exhaust gas temperature improves boiler efficiency.
Detailed description of the invention
Fig. 1 is the device flow diagram of the embodiment of the present invention；
Wherein flue before 1-tail portion, flue in 2-tail portions, 3-tail portion rear pass, 4-gas proportioning dampers (preceding), 5-
Gas proportioning damper (in), 6-gas proportioning dampers (rear), 7-economizers (preceding), 8-economizers (in), 9-economizers
(rear), 10-primary/secondary low-temperature reheater horizontal segments, 11-secondary/low-temperature reheater horizontal segments, 12-hot Secondary Airs
Heater, 13-primary/secondary low-temperature reheater vertical sections, 14-secondary/low-temperature reheater vertical sections, 15-packet walls,
16- burner hearth, 17- horizontal flue, the hot Secondary Air entrance of 121-, the hot Secondary Air outlet 122-.
Specific embodiment
Following non-limiting examples are for illustrating the present invention.
Embodiment 1:
Refering to what is shown in Fig. 1, hollow big arrow is flue gas flow direction in figure, solid small arrow is hot Secondary Air flow direction.A kind of tail
The double reheat boiler shape of three flue of portion arrangement, including back-end ductwork, back-end ductwork by packet wall 15 be separated into three it is arranged side by side
Flue, flue 1 respectively before tail portion, flue 2, tail portion rear pass 3 in tail portion, flue 1 is successively arranged along flue gas direction before tail portion
13, low-temperature reheater horizontal segments 10 of low-temperature reheater vertical section, economizer (preceding) 7 and gas proportioning damper (preceding) 4,
Flue 2 is successively arranged secondary low-temperature reheater vertical section 14, secondary low-temperature reheater horizontal segment 11, province along flue gas direction in tail portion
Coal device (in) 8 and gas proportioning damper (in) 5, tail portion rear pass 3 along flue gas direction be successively arranged hot Secondary Air heater 12, save
Coal device (rear) 9 and gas proportioning damper (rear) 6, the heat two of hot the Secondary Air outlet and hot Secondary Air heater 12 of air preheater
Secondary wind entrance 121 is connected to, and the hot Secondary Air outlet 122 of hot Secondary Air heater 12 is connected to burner hearth.Hot Secondary Air heater 12
Hot Secondary Air entrance 121 be set to the flue gas downstream of back-end ductwork, the hot Secondary Air outlet of hot Secondary Air heater 12 122 is set to
The flue gas upstream of back-end ductwork.
Embodiment 2:
Refering to what is shown in Fig. 1, the present embodiment is substantially the same manner as Example 1, difference is: the low temperature of flue 1 is again before tail portion
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), the low-temperature reheater of flue 2 is that a low-temperature reheater (is followed successively by a cold reheat along flue gas direction in tail portion
14, low-temperature reheater horizontal segments 11 of device vertical section).
Embodiment 3:
By taking 630 DEG C of double reheat Items as an example, BMCR operating condition has 30% exhaust gas volumn by tail portion rear pass (3),
The hot Secondary Air that this partial fume exports air preheater heats.This partial fume temperature is down to 420 DEG C from 735 DEG C, hot Secondary Air
478 DEG C are heated to from 360 DEG C.
As can be seen from the above table, compared with existing three flue double reheat boiler of tail portion, economizer exit of the present invention owes enthalpy
It improves, boiler efficiency raising, is conducive to boiler safety, efficient operation.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (4)
1. a kind of double reheat boiler shape of three flue of tail portion arrangement, including back-end ductwork, back-end ductwork are separated by packet wall
Three flues arranged side by side, respectively preceding flue, middle flue, rear pass, it is characterised in that: preceding flue and middle flue are along flue gas direction
It is successively arranged low-temperature reheater vertical section, low-temperature reheater horizontal segment, economizer and gas proportioning damper, rear pass is along flue gas side
To hot Secondary Air heater, economizer and gas proportioning damper is successively arranged, the hot Secondary Air of air preheater is exported and heat two
The hot Secondary Air entrance of secondary wind heater is connected to, and the hot Secondary Air outlet of hot Secondary Air heater is connected to burner hearth.
2. the double reheat boiler shape of three flue of tail portion as described in claim 1 arrangement, it is characterised in that: preceding flue it is low
Warm 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 of three flue of tail portion as described in claim 1 arrangement, it is characterised in that: preceding flue it is low
Warm 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 of three flue of tail portion arrangement as described in claim 1, it is characterised in that: hot Secondary Air adds
The hot Secondary Air entrance of hot device is set to the flue gas downstream of back-end ductwork, and the hot Secondary Air outlet of hot Secondary Air heater is set to tail portion
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 CN106247304A (en) | 2016-12-21 |
| CN106247304B true CN106247304B (en) | 2019-02-15 |
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| CN106765044B (en) * | 2017-01-03 | 2023-06-06 | 华电电力科学研究院 | System for power station boiler flue gas multichannel bypass waste heat grading utilization |
| 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 |
| 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 |
| CN114110559B (en) * | 2021-11-12 | 2023-05-23 | 东方电气集团东方锅炉股份有限公司 | Flue gas baffle arrangement structure of secondary reheating boiler and reheat steam temperature control method |
| 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 |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
| CN203533526U (en) * | 2013-09-17 | 2014-04-09 | 西安西热锅炉环保工程有限公司 | Waste-heat utilization system ensuring lignite boiler dry output and SCR safe smoke temperature |
| CN104976635A (en) * | 2015-07-02 | 2015-10-14 | 东方电气集团东方锅炉股份有限公司 | Boiler tail exhaust gas heat utilization system |
| 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 |
-
2016
- 2016-08-31 CN CN201610786640.9A patent/CN106247304B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
| CN203533526U (en) * | 2013-09-17 | 2014-04-09 | 西安西热锅炉环保工程有限公司 | Waste-heat utilization system ensuring lignite boiler dry output and SCR safe smoke temperature |
| CN104976635A (en) * | 2015-07-02 | 2015-10-14 | 东方电气集团东方锅炉股份有限公司 | Boiler tail exhaust gas heat utilization system |
| 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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| CN106247304A (en) | 2016-12-21 |
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