CN101280919B - Forward and backward wall opposite rushing combustion boiler hearth as well as method for arranging air nozzle on side wall - Google Patents
Forward and backward wall opposite rushing combustion boiler hearth as well as method for arranging air nozzle on side wall Download PDFInfo
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- CN101280919B CN101280919B CN2008100443521A CN200810044352A CN101280919B CN 101280919 B CN101280919 B CN 101280919B CN 2008100443521 A CN2008100443521 A CN 2008100443521A CN 200810044352 A CN200810044352 A CN 200810044352A CN 101280919 B CN101280919 B CN 101280919B
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Abstract
The invention pertains to forward and backward wall opposed firing type utility boiler combustion chamber and method for arranging air nozzle on its side. The combustion chamber comprises a pulverized coal burner, forward and backward walls of combustion chamber of combustion wind combustor group, and a combustion chamber body arranged with air nozzle group including two-sided wall, and a combustion chamber hopper at lower part of the combustion chamber body. The method arranging air nozzle on its side is to arrange 1-6 row of air nozzles above the intersecting line of lowest pulverized coal burner shaft cross section and two-sided wall, and symmetrical with side wall centre line. By arranging a nozzle cluster capable of supplying axial flow air and side flow air to the combustion chamber on two-sided walls at same time, the invention can reduce side wall temperature at same time of improving oxygen compensation strength and boiler thermal efficiency, can effectively prevent the two-sided walls from severe coking and high-temperature corrosion, can reduce examination and repair amount of work of combustion chamber and can prolong service-life. The invention overcomes disadvantages of low combustion efficiency, severe coking and high-temperature corrosion of the two-sided walls in background art.
Description
Technical field
The invention belongs to a kind of furnace of power-plant boilers and reach the method that air nozzle is set at its side wall.Particularly a kind of forward and backward wall opposed firing formula furnace of power-plant boilers reaches the method that air nozzle is set on this burner hearth both walls.
Background technology
At present, along with boiler develops towards big capacity and high parameter aspect, the advantage of wall firing boiler aspect combustion apparatus and heating surface layout is obvious day by day.Adopt the front-back wall fractional combustion mode that liquidates, show superheater, the reheater thermal deviation is little than the tangential firing mode, the furnace flame full level is better, perturbation also can effectively reduce advantages such as NOx discharge capacity by force, but accumulation along with the deep and field test data that front-back wall opposed firing formula burner hearth is studied, find any air nozzle or powdered coal burner all not to be set on the burner hearth both walls because the powdered coal burner and the oxygen supply of Opposite Firing Boiler burner hearth are arranged on the forward and backward wall of burner hearth with after-flame wind (OFA) burner (being air nozzle).Discovery in service is around the burner hearth aspect body of wall (water-cooling wall) thermic load, and the high heat load in the average load of both walls water-cooling wall and part all is higher than forward and backward wall, be simultaneously high CO concentration near side water wall medial surface zone line and hangs down O
2The concentration district is rendered as tangible reducing atmosphere, causes in this zone serious coking of water-cooling wall and high temperature corrosion serious; In addition, above-mentioned burner hearth be located on the forward and backward wall after-flame wind (OFA) the after-flame wind (air) that burner provided extremely difficulty satisfy near center oxygen supply requirement burner hearth center, the particularly both walls, thereby also influenced the efficiency of combustion and the service life of boiler.Thereby this type of boiler furnace burner hearth center when having operation, particularly, CO concentration height poor near both walls center later stage oxygenating situation, efficiency of combustion are low, both walls coking and high temperature corrosion are serious, and maintenance workload is big and influence the defectives such as service life of burner hearth.
Summary of the invention
The objective of the invention is the defective at the background technology existence, a kind of Opposite Firing Boiler burner hearth of research and design reaches the method that air nozzle is set on side wall.Strengthening when burner hearth center and the center oxygenating of nearside wall, improving its efficiency of combustion to reach, the effectively prevention both walls water-cooling wall generation of serious coking and high temperature corrosion phenomenon that is in operation, purpose such as reduce the burner hearth maintenance workload, increase the service life.
Solution of the present invention is that one group of air nozzle respectively is set on the burner hearth both walls, direct current air (wind) and effluent air (wind) are provided in burner hearth, with to the oxygenating of burner hearth center and reduce burner hearth sidewall near zone CO concentration and thermic load, effectively its serious coking and high temperature corrosion of prevention, thus realize its purpose.Therefore, the present invention includes and contain forward and backward body of wall and both sides body of wall, be positioned at the furnace hopper of the band ash hole of burner hearth lower body part, the powdered coal burner group and the after-flame wind combustor group that are divided on the forward and backward body of wall and are communicated with burner hearth cavity in interior burner hearth main body; Key is also to be respectively equipped with the air nozzle group that axial flow (direct current) air and effluent air can be provided simultaneously on the burner hearth both walls; Each nozzle sets is symmetrical arranged corresponding to the side wall center line, and each nozzle body is anchored on the side wall and passes body of wall and is communicated with burner hearth cavity.
The described air nozzle that axial flow air and effluent air can be provided simultaneously, the nozzle with three grade jet pipes of its air nozzle for being provided with one heart, and the spout of core jet pipe is straight mouthful or bundle mouth, second and third grade jet pipe is toroidal nozzle, its spout is 30 °～60 ° horn mouths, is respectively equipped with rotational flow generator simultaneously in the annular channel of two jet pipes.
Above-mentionedly in the method that air nozzle is set on the both walls of Opposite Firing Boiler burner hearth be: descending most more than the intersection of row's powdered coal burner shaft section and both walls and with the side wall center line and be symmetrical arranged 1～6 emptying gas jets, each air nozzle is integral with the side wall fit sealing and is communicated with burner hearth cavity.And described title is provided with 1～6 emptying gas jets, and when set air nozzle was 2～6 rows, the extreme position of going up an emptying gas jets center line most was the above 3m of the intersection place of after-flame wind combustor shaft section and both walls.
The present invention is owing to respectively set up one group of air nozzle on the both walls of traditional Opposite Firing Boiler burner hearth, both improved in burner hearth and the oxygenating intensity of nearside wall center, reduced again should the zone in the concentration of CO and the temperature in side wall high heat load district.The present invention can reduce near the CO concentration both walls central area below the 50ppm, and nearside wall center temperature descends 100～400 ℃, and the thermal efficiency of boiler improves 0.5～2.0%; Thereby have when improving boiler thermal output, can effectively prevent both walls water-cooling wall serious coking and high temperature corrosion in running, reduce the burner hearth maintenance workload, prolong characteristics such as burner hearth service life.Disadvantages such as it is lower to have overcome the background technology efficiency of combustion, and both walls coking and high temperature corrosion are serious.
Description of drawings
Fig. 1 is a structural representation of the present invention; Wherein (top) two-dot chain line is that modular constructions such as the boiler superheater that is positioned at upper furnace, reheater and mutual alignment concern schematic diagram.
Among the figure: 1. back wall, 2. furnace hopper, 3. before body of wall, 4. heat-insulation layer, 5. water-cooling wall, 6. powdered coal burner, 7. after-flame wind combustor, 8. air nozzle, 9. superheater, the 10. reheater of side wall body, 8～1..
The specific embodiment
Embodiment 1: with the subcritical Opposite Firing Boiler burner hearth of 600MW is example: burner hearth cavity is all identical with former boiler furnace with the structure of forward and backward body of wall 3,1 and furnace hopper 2, be burner hearth cavity width 20.7m, the degree of depth (side water wall is wide) 16.7m, the caliber of furnace wall cooling 5 is φ 66.7mm; Be symmetrical arranged 3 rows, 5 (totally 30) powdered coal burners 6 of every row on the forward and backward body of wall 3,1, every row is 3.8m, every burner horizontal interval 3.68m at interval; And 1 row, every row respectively are set at powdered coal burner shaft section 3.8m place, distance upper strata also is 5 after-flame wind combustor (group) 7, and every spacing also is 3.68m.Present embodiment respectively is provided with 3 emptying gas jets 8～1 on both sides body of wall 8, go up a row most and be located at the intersection position of the shaft section of after-flame wind combustor 7 and both walls and respectively establish 4, every spacing 3.3m with side wall axis symmetry; The 2nd row and next emptying gas jets be separated by with it 4.8m and 9.5m, being provided with 3 only reaches 4 respectively, every spacing 4.3m of the 2nd emptying gas jets wherein, that bottom row's spacing and first is arranged is identical, also be 3.3m; It is 25 ° of bundle mouths that each air nozzle 8～1 all adopts the core jet pipe oral area, and two, band rotational flow generator and nozzle hole are 45 ° of bell-mouthed air nozzles in the tertiary circulation shape jet pipe runner, all the connected mode with after-flame wind combustor 7 and forward and backward body of wall 3,1 is identical for the connected mode of each air nozzle 8～1 and side wall body.
Embodiment 2: present embodiment is provided with a row totally 5 air nozzles 8～1 at lower furnace portion powdered coal burner shaft section and the above 5.0m of both walls intersection place, is located on the side wall axis for middle one, and left and right symmetry respectively is provided with 2, and distance is 3.0m between each nozzle; All the other are all identical with embodiment 1.
Claims (4)
1. Opposite Firing Boiler burner hearth, comprise the burner hearth main body that contains forward and backward body of wall and both sides body of wall, be positioned at the furnace hopper of the band ash hole of burner hearth lower body part, the powdered coal burner group and the after-flame wind combustor group that are divided on the forward and backward body of wall and are communicated with burner hearth cavity; It is characterized in that on the burner hearth both walls, also being respectively equipped with the air nozzle group that axial flow air and effluent air can be provided simultaneously; Each nozzle sets is being symmetrical arranged corresponding to the side wall center line more than the intersection that descends row's powdered coal burner shaft section and both walls most and between the above 3m of the intersection of after-flame wind combustor shaft section and the both walls place, and each nozzle body is anchored on the side wall and passes body of wall and is communicated with burner hearth cavity.
2. by the described Opposite Firing Boiler burner hearth of claim 1, it is characterized in that the described air nozzle group that axial flow air and effluent air can be provided simultaneously, the nozzle with three grade jet pipes of its air nozzle for being provided with one heart, and the spout of core jet pipe is straight mouthful or bundle mouth, second and third grade jet pipe is toroidal nozzle, its spout is 30 °～60 ° horn mouths, is respectively equipped with rotational flow generator simultaneously in the annular channel of two jet pipes.
3. by the described Opposite Firing Boiler burner hearth of claim 1 in the method that air nozzle is set on the both walls be: be symmetrical arranged 2～6 emptying gas jets more than the intersection that descends most row's powdered coal burner shaft section and both walls and with the side wall center line, each air nozzle is integral with the side wall fit sealing and is communicated with burner hearth cavity.
4. by the described method that air nozzle is set of claim 3, it is characterized in that described 2～6 emptying gas jets that are symmetrical arranged on both walls, the extreme position of going up an emptying gas jets center line most is the above 3m of the intersection place of after-flame wind combustor shaft section and both walls.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100443521A CN101280919B (en) | 2008-05-07 | 2008-05-07 | Forward and backward wall opposite rushing combustion boiler hearth as well as method for arranging air nozzle on side wall |
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| CN2008100443521A CN101280919B (en) | 2008-05-07 | 2008-05-07 | Forward and backward wall opposite rushing combustion boiler hearth as well as method for arranging air nozzle on side wall |
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| CN101280919A CN101280919A (en) | 2008-10-08 |
| CN101280919B true CN101280919B (en) | 2011-05-11 |
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| CN102954474B (en) * | 2012-11-29 | 2015-12-09 | 华南理工大学 | A kind of secondary air arrangement device of garbage incinerator |
| CN104633652B (en) * | 2014-12-15 | 2017-01-25 | 西安热工研究院有限公司 | Burning system of opposite firing boiler |
| CN104595891B (en) * | 2015-01-21 | 2017-01-25 | 西安热工研究院有限公司 | Opposed firing structure of boiler |
| CN106016257B (en) * | 2016-05-20 | 2017-12-12 | 东方电气集团东方锅炉股份有限公司 | A kind of burnout degree method for arranging of Opposite Firing Boiler |
| CN113007699B (en) * | 2021-03-22 | 2021-12-03 | 江苏西铭节能环保科技有限公司 | Combustion optimization energy-saving environment-friendly system of opposed swirl combustion boiler |
| CN115638654B (en) * | 2022-11-15 | 2023-03-17 | 沈阳鑫博工业技术股份有限公司 | Spodumene mineral powder phase change conversion device |
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| CN1240021A (en) * | 1996-10-15 | 1999-12-29 | 西纳吉技术有限公司 | Corrosion protection for utility boiler side walls |
| US6279495B1 (en) * | 1999-10-22 | 2001-08-28 | Pulp And Paper Research Institute Of Canada | Method and apparatus for optimizing the combustion air system in a recovery boiler |
| CN1657825A (en) * | 2005-02-28 | 2005-08-24 | 哈尔滨工业大学 | Boiler device with wall fitted burner for preventing water-cooled wall corroded by high-temp and slagging scorification |
| CN1807977A (en) * | 2006-02-21 | 2006-07-26 | 西安热工研究院有限公司 | Novel three-region two-stage overfire air arrangement mode for wall type boiler |
| CN201025632Y (en) * | 2006-12-25 | 2008-02-20 | 富港电子（东莞）有限公司 | Integrated multi-frequency antenna |
| CN201025362Y (en) * | 2007-02-28 | 2008-02-20 | 哈尔滨工业大学 | A low nitrogen oxide vortex combustion device preventing from high temperature erosion |
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2008
- 2008-05-07 CN CN2008100443521A patent/CN101280919B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1240021A (en) * | 1996-10-15 | 1999-12-29 | 西纳吉技术有限公司 | Corrosion protection for utility boiler side walls |
| US6279495B1 (en) * | 1999-10-22 | 2001-08-28 | Pulp And Paper Research Institute Of Canada | Method and apparatus for optimizing the combustion air system in a recovery boiler |
| CN1657825A (en) * | 2005-02-28 | 2005-08-24 | 哈尔滨工业大学 | Boiler device with wall fitted burner for preventing water-cooled wall corroded by high-temp and slagging scorification |
| CN1807977A (en) * | 2006-02-21 | 2006-07-26 | 西安热工研究院有限公司 | Novel three-region two-stage overfire air arrangement mode for wall type boiler |
| CN201025632Y (en) * | 2006-12-25 | 2008-02-20 | 富港电子（东莞）有限公司 | Integrated multi-frequency antenna |
| CN201025362Y (en) * | 2007-02-28 | 2008-02-20 | 哈尔滨工业大学 | A low nitrogen oxide vortex combustion device preventing from high temperature erosion |
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Owner name: DONGFANG ELECTRIC GROUP DONGFANG BOILER GROUP CO., Free format text: FORMER NAME: DONGFANG BOILER (GROUP) CO., LTD. |
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Address after: 643000 Star Street Zigong city of Sichuan Province Huang Jue Ping No. 150 Patentee after: DEC Dongfang Boiler (Group) Co., Ltd. Address before: 643000 Zigong city of Sichuan Province Huang Jueping Wuxing Street Patentee before: Dongfang Boiler (Group) Co., Ltd. |