CN201155748Y - Circulating fluid bed boiler secondary air supply device - Google Patents
Circulating fluid bed boiler secondary air supply device Download PDFInfo
- Publication number
- CN201155748Y CN201155748Y CN 200820028041 CN200820028041U CN201155748Y CN 201155748 Y CN201155748 Y CN 201155748Y CN 200820028041 CN200820028041 CN 200820028041 CN 200820028041 U CN200820028041 U CN 200820028041U CN 201155748 Y CN201155748 Y CN 201155748Y
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- concave station
- secondary wind
- secondary air
- air supply
- hearth
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Abstract
The utility model relates to a recycling fluid bed boiler secondary air supplying system, which comprises a hearth lower wall surface 1. The secondary air of the hearth lower wall surface is supplied to the inward concave platforms 3 of the partial area; secondary air supplying pipes 2 with different heights are arranged on the concave platform 3; the inner wall of the secondary air supplying pipe 2 extends into the concave platform 3 so as to ensure a secondary air supplying nozzle can supply air to the hearth from the position closer to the hearth center, thus improving the oxygen density field distribution in the hearth combustion center area, eliminating the phenomenon of oxygen shortage in the hearth center area and increasing the operating economical efficiency. The utility model with simpler structure, more convenient production and installation and more stable boiler operation is suitable for the boiler design and technical improvement of the original boiler.
Description
Technical field
The utility model relates to a kind of CFBB secondary wind air supply device.
Technical background
The emulsion zone dilute-phase zone mobile and top that mainly is divided into the bottom that flows in the circulating fluid bed boiler flows, and the bottom emulsion zone i.e. section of awl is the main place that burning takes place; Its air quantity feed the employing air stage feeding, one time wind is fed by the burner hearth bottom air distribution plate, plays fluidisation and burning air feed; Secondary wind feeds aftercombustion requisite oxygen amount by wall spout around the lower furnace portion emulsion zone differing heights.Therefore, in time feeding of secondary wind influences very big to efficiency of combustion.Increase along with the CFBB capacity, section of burner hearth increases a lot, overfire air port can reach several meters to tens meters apart from the distance at burner hearth center, the secondary wind that overfire air port is fed is difficult to make the burner hearth central area be in the severe depletion of oxygen state by spraying and diffusion arrival burner hearth central area.Evidence, burner hearth center anoxic ubiquity in large circulating fluidized bed boiler, because the vast regional anoxic in burner hearth center causes fuel combustion insufficient, particularly the flammable object height of boiler fly ash has reduced boiler efficiency.Supply with problem in order to solve large circulating fluidized bed boiler secondary wind, the general employing reduced furnace width, perhaps increases the penetration capacity of secondary wind, as improving measures such as distinguished and admirable speed of secondary or momentum of impinging jet, but these methods all are subjected to the restriction of other factors, and effect is also very limited.China introduces " pants " leg structure of ALSTOM company, and lower furnace portion is divided into two, and has reduced the distance of overfire air port apart from the burner hearth center, has significantly improved oxygen amount supply situation in the stove, but complex structure, the manufacturing cost height, operational reliability is poor.
Summary of the invention
In order to overcome the shortcoming of above-mentioned prior art, the purpose of this utility model is to propose a kind of CFBB secondary wind air supply device, by near the wall the lower furnace portion overfire air port is recessed to burner hearth, make secondary wind air feed spout by position to burner hearth in the air feed nearer, be used to improve the zone oxygen concentration field distribution of burner hearth combustion centre from the burner hearth center.
Secondary wind air supply device of the present utility model comprises lower furnace portion wall 1, the secondary wind of lower furnace portion wall 1 infeeds the concave station 3 that the subregion concaves out, arrange the secondary wind air feed pipe 2 of differing heights on concave station 3, secondary wind air feed pipe 2 inwardly extend into the inwall of concave station 3.
Concave station 3 waters material feeding by water screen tube or fire-resistant abrasionproof and makes, and can be vertical or incline structure, and the angle of secondary wind air feed pipe 2 can be level or inclination, and its spout can be arranged in diverse locations such as the front of concave station 3 or side.
Concave station 3 embeds the degree of depth, height and the concrete size of burner hearth to be determined according to boiler capacity and lower furnace portion structure, and considers the abrasionproof requirement, is processed into shapes such as rectangle, arc, to alleviate wearing and tearing.Concave station 3 embeds the degree of depth 100mm-2000mm of burner hearths, highly is in the scope of air distribution plate 6500mm on it.
Traditional secondary wind air supply mode is that secondary wind air feed spout is arranged on the burner hearth emulsion zone wall 1, and the burner hearth wall does not have big concavo-convex.By indent formula secondary wind air feed system of the present utility model, increase burner hearth central burner wind supply quantity, improved combustion zone oxygen concentration field distribution, eliminated the phenomenon of burner hearth center anoxic, improved boiler combustion efficiency, secondary wind air supply device of the present utility model is simple in structure simultaneously, can be applicable to simultaneously that newly constructed boiler designs and have the technological transformation of boiler.
Description of drawings
Fig. 1 is the structural representation of secondary wind air supply device of the present utility model.
Fig. 2 is that the A-A of secondary wind air supply device structural representation of the present utility model is to view.
Fig. 3 is that the B-B of secondary wind air supply device structural representation of the present utility model is to view.
The specific embodiment
Below in conjunction with accompanying drawing embodiment of the present utility model is done and to be described in further detail.
Referring to Fig. 1, Fig. 2, Fig. 3, secondary wind air supply device of the present utility model comprises lower furnace portion wall 1, the secondary wind of lower furnace portion wall 1 infeeds the concave station 3 that the subregion concaves out, arrange the secondary wind air feed pipe 2 of differing heights on concave station 3, secondary wind air feed pipe 2 inwardly extend into the inwall of concave station 3.
Embodiment 1:
A kind of CFBB secondary wind air supply device, comprise lower furnace portion wall 1, the secondary wind of lower furnace portion wall 1 infeeds the concave station 3 that the subregion concaves out, and the degree of depth that concave station 3 embeds burner hearths is 1000mm, highly is the supreme 6000mm of air distribution plate, be processed into rectangular shape, to alleviate wearing and tearing.Arrange 2 secondary wind air feed pipes 2 that highly are respectively 5500mm and 2000mm on concave station 3, secondary wind air feed pipe 2 inwardly extend into the inwall of concave station 3.Concave station 3 is made by water screen tube, adopts vertical stratification.The angle of secondary wind air feed pipe 2 adopts level, and its spout is arranged in the front of concave station 3.
Embodiment 2:
A kind of CFBB secondary wind air supply device, comprise lower furnace portion wall 1, the secondary wind of lower furnace portion wall 1 infeeds the concave station 3 that the subregion concaves out, and the degree of depth that concave station 3 embeds burner hearths is 1200mm, highly is the supreme 6000mm of air distribution plate, be processed into rectangular shape, to alleviate wearing and tearing.Arrange 1 secondary wind air feed pipe 2 that height is 5500mm on concave station 3, secondary wind air feed pipe 2 inwardly extend into the inwall of concave station 3.Concave station 3 waters material feeding by fire-resistant abrasionproof and makes, and adopts incline structure, and the angle of inclination is 18 °.The angle of secondary wind air feed pipe 2 is a level, and its spout is arranged in the front of concave station 3.
Embodiment 3:
A kind of CFBB secondary wind air supply device, comprise lower furnace portion wall 1, the secondary wind of lower furnace portion wall 1 infeeds the concave station 3 that the subregion concaves out, and the degree of depth that concave station 3 embeds burner hearths is 1000mm, highly is the supreme 5000mm of air distribution plate, be processed into arcuate shape, to alleviate wearing and tearing.Arrange 2 secondary wind air feed pipes 2 that highly are respectively 4500mm and 1000mm on concave station 3, secondary wind air feed pipe 2 inwardly extend into the inwall of concave station 3.Concave station 3 is made by water screen tube, adopts vertical stratification.The angle of secondary wind air feed pipe 2 tilts, and the angle of inclination is the front that 30 ° of its spouts are arranged in concave station 3.
Embodiment 4:
A kind of CFBB secondary wind air supply device, comprise lower furnace portion wall 1, the secondary wind of lower furnace portion wall 1 infeeds the concave station 3 that the subregion concaves out, and the degree of depth that concave station 3 embeds burner hearths is 1200mm, highly is the supreme 5000mm of air distribution plate, be processed into arcuate shape, to alleviate wearing and tearing.Arrange 1 secondary wind air feed pipe 2 that height is 4500mm on concave station 3, secondary wind air feed pipe 2 inwardly extend into the inwall of concave station 3.Concave station 3 waters material feeding by fire-resistant abrasionproof and makes, and adopts incline structure, and the angle of inclination is 15 °.The angle of secondary wind air feed pipe 2 is levels, and its spout is arranged in the front of concave station 3.
Embodiment 5:
A kind of CFBB secondary wind air supply device, comprise lower furnace portion wall 1, the secondary wind of lower furnace portion wall 1 infeeds the concave station 3 that the subregion concaves out, and the degree of depth that concave station 3 embeds burner hearths is 1500mm, highly is the supreme 6000mm of air distribution plate, be processed into rectangular shape, to alleviate wearing and tearing.Arrange 1 secondary wind air feed pipe 2 that height is 5600mm on concave station 3, secondary wind air feed pipe 2 inwardly extend into the inwall of concave station 3.Concave station 3 is made by water screen tube, adopts incline structure, and the angle of inclination is 15 °.The angle of secondary wind air feed pipe 2 tilts, and the angle of inclination is 30 °.Its spout is arranged in the front of concave station 3.
Embodiment 6:
A kind of CFBB secondary wind air supply device, comprise lower furnace portion wall 1, the secondary wind of lower furnace portion wall 1 infeeds the concave station 3 that the subregion concaves out, and the degree of depth that concave station 3 embeds burner hearths is 600mm, highly is the supreme 5000mm of air distribution plate, be processed into rectangular shape, to alleviate wearing and tearing.Arrange 1 secondary wind air feed pipe 2 that height is 4500mm on concave station 3, secondary wind air feed pipe 2 inwardly extend into the inwall of concave station 3.Concave station 3 is made by water screen tube, adopts vertical stratification.The angle of secondary wind air feed pipe 2 tilts, and the angle of inclination is 18 °.Its spout is arranged in the side of concave station 3.
Embodiment 7:
A kind of CFBB secondary wind air supply device, comprise lower furnace portion wall 1, the secondary wind of lower furnace portion wall 1 infeeds the concave station 3 that the subregion concaves out, and the degree of depth that concave station 3 embeds burner hearths is 800mm, highly is the supreme 5500mm of air distribution plate, be processed into arcuate shape, to alleviate wearing and tearing.Arrange 1 secondary wind air feed pipe 2 that height is 5000mm on concave station 3, secondary wind air feed pipe 2 inwardly extend into the inwall of concave station 3.Concave station 3 waters material feeding by fire-resistant abrasionproof and makes, and adopts incline structure, and the angle of inclination is 18 °.The angle of secondary wind air feed pipe 2 is levels, and its spout is arranged in the side of concave station 3.
Claims (5)
1, supplying secondary air to indent type circulating fluidized bed device, comprise lower furnace portion wall (1), it is characterized in that, the secondary wind of lower furnace portion wall (1) infeeds the concave station (3) that the subregion concaves out, go up the secondary wind air feed pipe (2) of arranging differing heights at concave station (3), secondary wind air feed pipe (2) inwardly extend into the inwall of concave station (3).
According to the described air supply device of claim 1, it is characterized in that 2, concave station (3) waters material feeding by water screen tube or fire-resistant abrasionproof and makes, can be vertical or incline structure.
According to claim 1 or 2 described air supply devices, it is characterized in that 3, concave station (3) embeds the degree of depth 100mm-2000mm of burner hearth, highly is in the scope of air distribution plate 6500mm on it.
According to claim 1 or 2 described air supply devices, it is characterized in that 4, concave station (3) can be processed into rectangle or arc.
According to the described air supply device of claim 1, it is characterized in that 5, the angle of secondary wind air feed pipe (2) can be level or inclination, be arranged in the front or the side of concave station.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200820028041 CN201155748Y (en) | 2008-01-07 | 2008-01-07 | Circulating fluid bed boiler secondary air supply device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200820028041 CN201155748Y (en) | 2008-01-07 | 2008-01-07 | Circulating fluid bed boiler secondary air supply device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201155748Y true CN201155748Y (en) | 2008-11-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200820028041 Expired - Lifetime CN201155748Y (en) | 2008-01-07 | 2008-01-07 | Circulating fluid bed boiler secondary air supply device |
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| Country | Link |
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| CN (1) | CN201155748Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101225954B (en) * | 2008-01-07 | 2010-06-23 | 西安热工研究院有限公司 | Method for supplying secondary air to indent type circulating fluidized bed and device thereof |
| CN103712208A (en) * | 2013-12-25 | 2014-04-09 | 北京兴侨国际工程技术有限公司 | Combustion method of circulating fluidized bed boiler with low nitrogen oxide emission |
| CN103912871A (en) * | 2014-04-15 | 2014-07-09 | 国家电网公司 | Seal valve material returning system for chemical loop combustion system |
| CN103939892A (en) * | 2014-04-02 | 2014-07-23 | 无锡华光锅炉股份有限公司 | Secondary air distribution structure for circulating fluidized bed boiler |
-
2008
- 2008-01-07 CN CN 200820028041 patent/CN201155748Y/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101225954B (en) * | 2008-01-07 | 2010-06-23 | 西安热工研究院有限公司 | Method for supplying secondary air to indent type circulating fluidized bed and device thereof |
| CN103712208A (en) * | 2013-12-25 | 2014-04-09 | 北京兴侨国际工程技术有限公司 | Combustion method of circulating fluidized bed boiler with low nitrogen oxide emission |
| CN103939892A (en) * | 2014-04-02 | 2014-07-23 | 无锡华光锅炉股份有限公司 | Secondary air distribution structure for circulating fluidized bed boiler |
| CN103912871A (en) * | 2014-04-15 | 2014-07-09 | 国家电网公司 | Seal valve material returning system for chemical loop combustion system |
| CN103912871B (en) * | 2014-04-15 | 2016-03-16 | 国家电网公司 | For the seal valve revert system of burning chemistry chains system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20081126 Effective date of abandoning: 20080107 |