CN107228358B - Double-step arched W-flame boiler hearth structure - Google Patents
Double-step arched W-flame boiler hearth structure Download PDFInfo
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- CN107228358B CN107228358B CN201710535906.7A CN201710535906A CN107228358B CN 107228358 B CN107228358 B CN 107228358B CN 201710535906 A CN201710535906 A CN 201710535906A CN 107228358 B CN107228358 B CN 107228358B
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- 230000007704 transition Effects 0.000 claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 238000005452 bending Methods 0.000 claims description 3
- 239000003245 coal Substances 0.000 description 13
- 238000002485 combustion reaction Methods 0.000 description 12
- 238000001816 cooling Methods 0.000 description 5
- 238000007664 blowing Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 239000004071 soot Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 2
- 239000003830 anthracite Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/18—Details; Accessories
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combustion Of Fluid Fuel (AREA)
Abstract
The invention relates to a hearth structure of a double-step arch W-flame boiler, which is divided into an upper hearth (7) and a lower hearth (1) from top to bottom, wherein the middle of the upper hearth and the lower hearth are connected through an upper hearth transition pipe group (8). The front wall and the rear wall of the lower hearth (1) form a stepped furnace arch (2) through bent pipes, a row of main burners (3) are respectively arranged on each step of the stepped furnace arch (2), and the burners are arranged in staggered mode. According to the technical scheme, the double-step arch W-shaped flame boiler furnace structural design is adopted, so that the typical front-back wall arch single-row burner arrangement form of the original W-shaped flame boiler can be changed into the front-back wall arch double-row burner arrangement form. After the double-step arch W-flame boiler chamber structure and the arch double-row burner arrangement form are adopted, the width of a hearth of a W-flame boiler with the grade of 1000MW and above can be greatly reduced, and the double-step arch W-flame boiler chamber structure has the characteristics of economy and safety.
Description
Technical Field
The present invention relates to pulverized coal boilers. In particular to a W flame boiler hearth structure for a 1000MW capacity grade ultra-supercritical pulverized coal boiler of a thermal power plant.
Background
The W flame boiler is mainly used for burning anthracite and poor-quality lean coal with low reaction characteristics, the hearth consists of a lower combustion chamber and an upper cooling chamber, and the fuel combustion process is basically carried out in the lower combustion chamber. The upper hearth and the lower hearth adopt arched transition, the burner is arranged at the arch position of the furnace, and the pulverized coal airflow is sprayed downwards from the arch to ignite and burn. After the coal powder particles in the ignited coal powder airflow undershoot to the lower part of the hearth, the weight of the coal powder particles is reduced due to the loss of combustion, high-temperature flue gas is supported by the lower part of the stage wind of the combustion chamber, upwards turns and flows under the action of the upward pulling force of ventilation in the hearth, and W-shaped flame is formed in the lower combustion chamber. The structural design of the hearth can ensure that anthracite and inferior lean coal with low reaction characteristics can be stably ignited in the furnace and can be combusted in a follow-up and efficient way.
For W flame boilers of 600MW grade and below, a row of burners are respectively arranged at the tops of the front furnace arch and the rear furnace arch of the hearth. When the W flame boiler capacity is increased to 1000MW level, the number of burners is limited by the heat power of a single burner, if the number of burners is increased to about 48, and if a row of burners are arranged at the top of the front and rear furnace arches of the hearth, the width of the hearth is greatly increased, and the structural designs of a large plate girder for hanging the boiler in the width direction of the hearth, a rigid girder for supporting and explosion-proof the boiler, a secondary air bellows frame for supplying air to the combustion system, a boiler soot blowing system and other parts can all meet the technical problems which cannot be overcome. Therefore, to move the capacity of a W-flame boiler to a larger capacity on the order of 600MW, the problem of how to accommodate more burners within an acceptable furnace width must be addressed. And the new hearth and the structural form of the combustion system are required to meet the requirements of stable ignition and subsequent efficient combustion of the pulverized coal in the furnace.
Disclosure of Invention
The invention aims to provide a double-step arched W-flame boiler furnace structure, which does not change the double-arch structure of the traditional W-flame boiler, has more flexible arrangement mode of burners, can effectively solve the problem of arrangement of the burners after the capacity of a unit is increased to 1000MW and above, and simultaneously controls the width of the furnace to be in an acceptable range of 33-37 meters, thereby avoiding the technical obstacles which cannot be overcome due to the too wide furnace of structural designs of parts such as a large plate girder of a boiler steel structure, a rigid girder which supports and explosion-proof the boiler, a secondary air bellows framework which is responsible for supplying air for a combustion system, a boiler soot blowing system and the like.
In order to achieve the purpose of the invention, the following technical scheme is provided:
a hearth structure of a double-step arch W-shaped flame boiler is divided into an upper hearth 7 and a lower hearth 1 from top to bottom, and the middle of the upper hearth and the lower hearth are connected through an upper hearth transition pipe group 8 and a lower hearth transition pipe group 8. The front wall and the rear wall of the lower hearth 1 form a stepped furnace arch 2 through bent pipes, a row of main burners 3 are respectively arranged on each step of the stepped furnace arch 2, and the burners are arranged in staggered mode.
The height of each step of the furnace arch 2 of the lower furnace chamber 1 is enough to be supported horizontally, so that the strength requirement of the furnace arch is met.
The main burner 3, the exhaust air nozzle 5 and the classified air nozzle 6 which are arranged on the hearth are arranged on the front wall water cooling wall and the rear wall water cooling wall of the lower hearth 1.
The four corners of the lower hearth 1 are in a chamfer type structure, and the chamfer structure is formed by bending a water wall pipe.
The upper furnace 7 of the boiler furnace is inclined upwards by 15-20 degrees in the gradient, and two rows of main burners 3 are respectively arranged on the furnace 2 and are used for the W flame boiler furnace with the grade of 1000MW and above.
By adopting the structural design of the hearth of the double-step arch W-shaped flame boiler, the typical arrangement form of the single-row burner on the front and back wall arches of the original W-shaped flame boiler can be changed into the arrangement form of the double-row burner on the front and back wall arch. After the double-step arch W-flame boiler furnace structure and the arch double-row burner arrangement form are adopted, the furnace width of the W-flame boiler with the grade of 1000MW and above can be greatly reduced.
The double-step arched W-flame boiler furnace structure has the characteristics of economy and safety, and is suitable for W-flame boilers with the grade of 1000MW and above.
Drawings
FIG. 1 is a side view of a furnace structure;
FIG. 2 is a front view of the furnace structure;
FIG. 3 is a schematic view of a lower furnace arch burner arrangement;
wherein: 1 lower hearth, 2 furnace arch, 3 main burner, 4 hearth rigid beam, 5 exhaust air nozzle, 6 classifying air nozzle, 7 upper hearth,
8 upper and lower furnace transition tube groups.
Description of the embodiments
The present invention will be further described in detail with reference to the drawings and the specific embodiments, in order to make the objects, technical solutions and advantages of the present invention more apparent.
FIG. 1 is a side view of a furnace structure; fig. 2 is a front view of the furnace structure. As shown in the figure, the hearth of the double-step arch W-shaped flame boiler is divided into an upper hearth 7 and a lower hearth 1 from top to bottom, and the middle parts of the upper and lower hearths are connected through an upper hearth transition pipe group 8 and a lower hearth transition pipe group. Main combustion system equipment such as a main burner 3, a ventilation air nozzle 5, a classification air nozzle 6 and the like are arranged on the front wall water cooling wall and the rear wall water cooling wall of the lower hearth 1. The front wall and the rear wall of the lower hearth 1 form a step-shaped furnace arch 2 through bent pipes, a row of main burners 3 are respectively arranged on each step of the step-shaped furnace arch 2, and meanwhile, the steps are left with enough height and enough space to be horizontally supported, so that the strength requirement of the furnace arch is met.
Fig. 3 is a schematic diagram of the arrangement of the burner on the arch of the lower hearth 1, four corners of the lower hearth 1 of the double-step arch W-shaped flame boiler hearth are in a chamfer structure form, and the chamfer structure is formed by bending a water wall pipe. The arrangement form of the front and rear wall main burner 3 and the corner cut structure of the hearth are shown in the cross section view of the lower hearth 1. The burner adopts staggered double rows.
The structure solves the problem of arrangement of the burner after the capacity of the boiler is increased to the level of 1000MW and above. The spacing between each row of main burners is selected according to the actual burning and coking characteristics of the coal. The horizontal distance between the main burners is 2090mm according to the coal making characteristic, 48 main burners are required to be arranged according to the capacity requirement of a 1000MW boiler, for example, 24 main burners are required to be arranged in each row according to the traditional arrangement mode of single-row burners on the front wall and the rear wall, the safety distance from the main burner on the most side to the side of a hearth is considered, the width of the hearth reaches 57585mm, the hearth with the width is a steel structure of the boiler, a top plate (a girder) and a rigid girder which supports the boiler and prevents explosion, and the structural design of parts such as a secondary air box framework for supplying air for a combustion system, a boiler soot blowing system and the like is insurmountable due to the too wide of the hearth.
According to the double-step arch W-flame boiler furnace structure, the number of main burners in each row is reduced to 12 from original 24 by adopting a double-row configuration mode on the front and rear water wall arches, the width of the furnace can be greatly reduced to 34595mm on the premise of maintaining the horizontal spacing 2090mm of the original main burners, the size of the furnace in the width direction is effectively shortened, and boiler supports such as girder plates, a rigid Liang Hefeng box framework and the like can be reasonably arranged, so that the boiler support structure is similar to a conventional 600 MW-level boiler, and the technical bottleneck caused by greatly increasing the furnace width is overcome. Meanwhile, the main burners on the step arch are arranged in a double-row staggered mode, so that mutual interference between the burners in the initial stage of ignition of pulverized coal airflow can be effectively avoided, and the ignition stability of each burner can be ensured. The invention is suitable for the furnace structure of the W flame boiler with the capacity grade of 1000MW and above.
Taking a 1000MW capacity W flame boiler hearth as an example, the upper hearth depth is 13420mm, the lower hearth depth is 26620mm, the upper and lower hearth widths are 34595mm, the furnace arch gradient is inclined upwards by 15-20 degrees, two rows of main burners 3 are respectively arranged on the furnace arch 2 of the lower hearth 1, each row is 12, and 48 main burners are arranged in each furnace.
The boiler furnace structure solves the problem of arrangement of the burner after the boiler capacity is increased, simultaneously, effectively shortens the dimension of the furnace in the width direction, and can more reasonably arrange the boiler supports such as the girder, the rigid Liang Hefeng box framework and the like, so that the boiler support structure is similar to a conventional 600 MW-level boiler, and the technical bottleneck caused by the large-scale increase of the furnace width is overcome. The arrangement form of the double-row staggered combustors on the step arch can effectively avoid mutual interference between the combustors in the initial stage of ignition of the pulverized coal airflow, and can ensure the ignition stability of each combustor.
While the foregoing is directed to embodiments of the present invention, other and further details of the invention may be had by the present invention, it should be understood that the foregoing description is merely illustrative of the present invention and that no limitations are intended to the scope of the invention, except insofar as modifications, equivalents, improvements or modifications are within the spirit and principles of the invention.
Claims (5)
1. The double-step arched W-flame boiler furnace structure is characterized in that the furnace structure is divided into an upper furnace (7) and a lower furnace (1) from top to bottom, and the middle of the upper furnace and the lower furnace are connected through an upper furnace transition pipe group (8); the front wall and the rear wall of the lower hearth (1) form a stepped furnace arch (2) through bent pipes, a row of main burners (3) are respectively arranged on each step of the stepped furnace arch (2), and the burners are arranged in staggered mode.
2. The boiler furnace structure according to claim 1, characterized in that the height of each step of the furnace arch (2) of the lower furnace (1) is left with enough space to be horizontally supported, thereby meeting the furnace arch strength requirement.
3. The boiler furnace structure according to claim 1, characterized in that the main burner (3), the furnace equipped exhaust air nozzles (5) and the classification air nozzles (6) are arranged on the front and rear wall water cooled walls of the lower furnace (1).
4. The boiler furnace structure according to claim 1, characterized in that the four corners of the lower furnace (1) are in the form of chamfer structures, and the chamfer structures are formed by bending water wall tubes.
5. The boiler furnace structure according to claim 1, wherein the front and rear walls of the lower furnace (1) of the boiler furnace are of a double-step arch structure, the furnace arch (2) of the upper furnace (7) is inclined upwards by 15-20 degrees, and two rows of main burners (3) are respectively arranged on the furnace arch (2) for the W flame boiler furnace of 1000MW and above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710535906.7A CN107228358B (en) | 2017-07-04 | 2017-07-04 | Double-step arched W-flame boiler hearth structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710535906.7A CN107228358B (en) | 2017-07-04 | 2017-07-04 | Double-step arched W-flame boiler hearth structure |
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| CN107228358A CN107228358A (en) | 2017-10-03 |
| CN107228358B true CN107228358B (en) | 2024-01-30 |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109028051B (en) * | 2018-10-22 | 2024-04-30 | 北京巴布科克·威尔科克斯有限公司 | Three-cyclone low-CO high-efficiency pulverized coal burner |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101368725A (en) * | 2008-09-27 | 2009-02-18 | 哈尔滨工业大学 | Stable combustion anti-slag gap type W-shaped flame boiler apparatus |
| CN101832548A (en) * | 2010-04-19 | 2010-09-15 | 哈尔滨工业大学 | Method for arch single-stage injection fractional combustion and W flame boiler for realizing method |
| CN202082915U (en) * | 2011-05-27 | 2011-12-21 | 烟台龙源电力技术股份有限公司 | W-shape flame boiler with grading secondary air layout structure |
| CN104406160A (en) * | 2014-11-19 | 2015-03-11 | 中国计量学院 | Low-NOx four-arch type W flame boiler for coupling air staging and fuel staging |
| CN104595892A (en) * | 2014-12-30 | 2015-05-06 | 华电电力科学研究院 | Ejecting staged combustion W flame boiler for improving ignition and combustion of pulverized coal |
| CN105546521A (en) * | 2015-12-28 | 2016-05-04 | 哈尔滨工业大学 | W-flame boiler with rotational flow pulverized coal burners with primary air and secondary air eccentrically arranged |
| CN207350325U (en) * | 2017-07-04 | 2018-05-11 | 北京巴布科克·威尔科克斯有限公司 | A kind of new step arch W flame boiler furnace structure |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101832549B (en) * | 2010-04-19 | 2013-03-27 | 哈尔滨工业大学 | Multi-ejection grading combustion method |
-
2017
- 2017-07-04 CN CN201710535906.7A patent/CN107228358B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101368725A (en) * | 2008-09-27 | 2009-02-18 | 哈尔滨工业大学 | Stable combustion anti-slag gap type W-shaped flame boiler apparatus |
| CN101832548A (en) * | 2010-04-19 | 2010-09-15 | 哈尔滨工业大学 | Method for arch single-stage injection fractional combustion and W flame boiler for realizing method |
| CN202082915U (en) * | 2011-05-27 | 2011-12-21 | 烟台龙源电力技术股份有限公司 | W-shape flame boiler with grading secondary air layout structure |
| CN104406160A (en) * | 2014-11-19 | 2015-03-11 | 中国计量学院 | Low-NOx four-arch type W flame boiler for coupling air staging and fuel staging |
| CN104595892A (en) * | 2014-12-30 | 2015-05-06 | 华电电力科学研究院 | Ejecting staged combustion W flame boiler for improving ignition and combustion of pulverized coal |
| CN105546521A (en) * | 2015-12-28 | 2016-05-04 | 哈尔滨工业大学 | W-flame boiler with rotational flow pulverized coal burners with primary air and secondary air eccentrically arranged |
| CN207350325U (en) * | 2017-07-04 | 2018-05-11 | 北京巴布科克·威尔科克斯有限公司 | A kind of new step arch W flame boiler furnace structure |
Non-Patent Citations (2)
| Title |
|---|
| "W"火焰锅炉燃烧调整试验探讨;徐齐胜, 马斌, 罗萌, 李乃钊, 宋景慧;四川电力技术(02);全文 * |
| 600MW亚临界"W"火焰锅炉机组劣质煤燃烧特性;黄伟;李文军;雷霖;俞于鹏峰;阳剑平;;中国电力(07);全文 * |
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