CN103216822B - Circulating fluidized bed boiler having water cooling reinforcement structure - Google Patents
Circulating fluidized bed boiler having water cooling reinforcement structure Download PDFInfo
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- CN103216822B CN103216822B CN201210017752.XA CN201210017752A CN103216822B CN 103216822 B CN103216822 B CN 103216822B CN 201210017752 A CN201210017752 A CN 201210017752A CN 103216822 B CN103216822 B CN 103216822B
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Abstract
The invention provides a circulating fluidized bed boiler. The circulating fluidized bed boiler comprises a hearth and a water cooling column, wherein the water cooling column is arranged in the hearth and is formed through enclosing a plurality of column membrane water cooling walls, an angle is formed between adjacent column membrane water cooling walls, the outside of the water cooling column at the corner of the adjacent column membrane water cooling walls of the plurality of column membrane water cooling walls is provided with at least one reinforcement wall formed by water cooling tubes and extending out of the whole height of the water cooling column, and the reinforcement wall protrudes toward the inside of the hearth from the water cooling column. A structure for increasing the strength of the circulating fluidized bed water cooling column is provided through utilizing the above technical scheme of the invention. The structure has the advantages of no occupying of the space in the column, increase of the strength of the hearth water cooling column, guarantee of the safe running of the water cooling column, and reduction of unfavorable influences to the combustion of a hearth fuel as possible.
Description
Technical field
The present invention relates to large circulating fluidized bed boiler technical field, particularly the reinforcement structure of boiler hearth of circulating fluidized bed water-cooled column.
Background technology
Maximization is the inexorable trend of CFBB development, along with the increase of CFBB capacity, the heat release volume of burner hearth comparatively in stove evaporating heating surface increase faster, the unbalanced increase of heat release and heat absorption causes the Layout Problem of heating surface.Meanwhile, furnace depth increases, and Secondary Air penetration depth is difficult to synchronous increase, is also a great problem in maximizing.
For solving the Layout Problem of heating surface and the penetration problem of Secondary Air in CFBB maximization process simultaneously, Chinese patent ZL200710151813.0 discloses a kind of water-cooled column be arranged in burner hearth, not only considerably increase furnace heating surface as extended surface to amass, also have the function that Secondary Air is provided to burner hearth central area concurrently.Because water-cooled column is identical with furnace height, for large circulating fluidized bed boiler, water-cooled column height may reach more than 50 meters; Cross sectional dimensions its height ratio great disparity relatively of water-cooled column, therefore water-cooled column is along the easy torsional deformation of short transverse, must reinforce water-cooled column structure.
The settling mode of prior art in water-cooled column, arranges buckstay to improve the intensity of water-cooled column, if but also will arrange secondary air duct in post, then arrangement space is nervous, the cross sectional dimensions of increase water-cooled column of often having to. simultaneouslyBut water-cooled column sectional dimension amplifies the material blending be but unfavorable in burner hearth.
Chinese patent 01227149.7 discloses a kind of high strength film type water-cooled wall of boiler, and increase a row or multi-row water cooling tube in the heating surface side of main fin panel casing, water cooling tube is arranged continuously or is interrupted layout.But because water cooling tube tube wall temperature is far below burner hearth mean temperature, be that to press close to the skim regional temperature of water-cooling wall lower before not increasing these water cooling tubes; After increasing these water cooling tubes, cooling wall is too concentrated, and the regional extent that temperature is lower expands greatly, and easily cannot continue because of temperature decrease after fuel enters these regions to maintain burning, this will cause boiler combustion efficiency to reduce.
Summary of the invention
The object of the invention is to overcome prior art defect, a kind of structure increasing recirculating fluidized bed water-cooled column intensity is provided, this structure does not take space in post, add the intensity of furnace water cooling post simultaneously, ensure the security of operation of water-cooled column, and decrease the adverse effect of the burning to burner hearth fuel as far as possible.
For achieving the above object, technical solution of the present invention is as follows:
According to the present invention, propose a kind of CFBB, comprising: burner hearth; Water-cooled column, described water-cooled column is arranged on to enclose in burner hearth and by multi-disc post fin panel casing and forms, angulation between adjacent pillars fin panel casing, wherein: have at least one reinforced wall formed by water cooling tube extended on the whole height of described water-cooled column in the arranged outside of described water-cooled column in the bight that the adjacent pillars fin panel casing of described multiple post fin panel casing connects, described reinforced wall is outstanding in described burner hearth from described water-cooled column.
Alternatively, described reinforced wall comprises monolithic reinforcement fin panel casing, and described reinforcement fin panel casing utilizes the fin that extends in the short transverse of water-cooled column and is connected to each other at the water cooling tube in water-cooled column bight.Advantageously, described reinforcement fin panel casing comprises 1-4 root water cooling tube.Advantageously, the diameter of the water cooling tube of described reinforced wall is greater than the diameter not being positioned at the water cooling tube in bight of described water-cooled column.Further, the diameter of the water cooling tube in described water-cooled column bight and wall thickness are all greater than the diameter not being positioned at the water cooling tube in bight and the wall thickness of water-cooled column.
Alternatively, in the bight of described water-cooled column, the first fin extended on the whole height of water-cooled column between adjacent pillars fin panel casing, is utilized to be connected with each other; Described reinforced wall comprises two reinforcement fin panel casings be arranged in parallel, the side of a reinforcement fin panel casing utilizes the second fin extended on the whole height of water-cooled column to adjoin one another with the water cooling tube connected with described first fin of in described adjacent pillars fin panel casing, and the side of another reinforcement fin panel casing utilizes the 3rd fin extended on the whole height of water-cooled column to adjoin one another with another the water cooling tube connected with described first fin in described adjacent pillars fin panel casing; The opposite side of two described reinforcement fin panel casings utilizes the 4th fin extended on the whole height of water-cooled column to adjoin one another; And described first fin is provided with the multiple openings communicated with the inner space of described water-cooled column the inner space of described reinforced wall.
In above-mentioned CFBB, advantageously, the angle between each reinforcement fin panel casing and connected post fin panel casing is greater than 90 degree.
Advantageously, perpendicular in a water-cooled column cross section of burner hearth center line, described reinforced wall is arranged symmetrically with about the intersection point of described burner hearth center line and described water-cooled column cross section.
Further, described water-cooled column cross section is square, rectangle, regular hexagon or octagon.Advantageously, each angle as polygonal water-cooled column cross section is provided with a reinforced wall.
Further advantageously, the angle between all reinforcement fin panel casings and connected corresponding post fin panel casing is identical.
The present invention arranges reinforced wall by the bight at water-cooled column, improves the intensity of water-cooled column, ensures the safety and reliability of water-cooled column in running.And when set reinforced wall and other cooling wall spacing suitable, can not cause topical hypothermia region, reduce efficiency of combustion.In addition, because reinforced wall is made up of water cooling tube, further increase stove internal heating surface and amass, the fire box temperature being conducive to large circulating fluidized bed boiler controls and heating power distribution design.And, when the interface angle of reinforced wall and water-cooled column wall is greater than 90 °, material also can not be caused to concentrate, cause bight water screen tube wearing and tearing.
By hereinafter reference accompanying drawing description made for the present invention, other object of the present invention and advantage will be apparent, and can help there is comprehensive understanding to the present invention.
Accompanying drawing explanation
The present invention further describes with reference to the accompanying drawings, wherein:
Fig. 1 is the front elevational schematic of the burner hearth of CFBB according to an embodiment of the invention;
Fig. 2 is the schematic top plan view of the burner hearth of CFBB according to an embodiment of the invention;
Fig. 3 be rectangle water-cooled column in the burner hearth of CFBB according to an embodiment of the invention overlook enlarged diagram;
Fig. 4 be hexagon water-cooled column in the burner hearth of CFBB according to another embodiment of the invention overlook enlarged diagram;
Fig. 5 be octagon water-cooled column in the burner hearth of CFBB according to still a further embodiment overlook enlarged diagram;
Fig. 6 be square water-cooled column in the burner hearth of CFBB according to still another embodiment of the invention overlook enlarged diagram.
Detailed description of the invention
Although fully describe the present invention with reference to the accompanying drawing containing preferred embodiment of the present invention, before this describes, should be appreciated that those of ordinary skill in the art can revise invention described herein, obtain technique effect of the present invention simultaneously.Therefore, Yan Weiyi discloses widely to those of ordinary skill in the art must to understand above description, and its content does not lie in restriction exemplary embodiment described in the invention.
The present invention is used for the CFBB being provided with one or more vertical water-cooled column between burner hearth air distribution plate, ceiling.Water-cooled column is column, is enclosed form by post fin panel casing, and cross section is polygon, as square, rectangle, regular hexagon, octagon etc.
As shown in figures 1-5, boiler hearth of circulating fluidized bed is enclosed by front wall 2, rear wall 5, left side wall 7, right-side wall 4, ceiling 9 and air distribution plate 8 and forms, and six cyclone separators 1 are arranged symmetrically in outside the front-back wall of burner hearth; Simultaneously between burner hearth ceiling 9 and air distribution plate 8, two vertical water-cooled columns 3 are arranged symmetrically with along furnace chamber width (distance between the side wall of burner hearth left and right is width), water-cooled column 3 is the tetragonal prisms enclosed by fin panel casing 11, and cross section is rectangle; The corner of water-cooled column 3 is welded and fixed by fin and 4 reinforced walls be also made up of fin panel casing 6, every sheet reinforced wall 6 comprises 3 water cooling tubes, reinforced wall 6 is highly identical with water-cooled column 3, and reinforced wall 6 is towards hearth combustion space, reinforced wall 6 is 135 ° with the angle β of adjacent water-cooled column 3 side.
The water cooling tube caliber d3 of reinforced wall 6 is greater than the caliber d2 of water-cooled column 3 bight water cooling tube, the caliber d2 of water-cooled column 3 bight water cooling tube is equal to or greater than the water cooling tube caliber d1 of water-cooled column 3 non-corner, and the wall thickness of water-cooled column 3 bight water cooling tube is greater than the water cooling tube wall thickness of water-cooled column 3.Highly same refractory material 12 is laid with lower furnace portion water-cooling wall in reinforced wall 6 bottom, water-cooled column 3 bottom.
CFBB according to the present invention comprises: burner hearth; Water-cooled column 3, described water-cooled column is arranged on to form to enclose in burner hearth and by multi-disc post fin panel casing and forms, angulation between adjacent pillars fin panel casing, as shown in figures 2-6, wherein: have at least one reinforced wall 6 formed by water cooling tube extended on the whole height of described water-cooled column in the arranged outside of described water-cooled column in the bight that the adjacent pillars fin panel casing of described multiple post fin panel casing connects, described reinforced wall is outstanding in described burner hearth from described water-cooled column.
As illustrated in figs.3-5, described reinforced wall 6 comprises monolithic reinforcement fin panel casing, and described reinforcement fin panel casing utilizes the fin 13 that extends in the short transverse of water-cooled column 3 and is connected to each other at the water cooling tube in water-cooled column bight.On the water cooling tube in the bight of water-cooled column 3, towards the direction in hearth combustion space, by the fin welding reinforced wall 6 identical with water-cooled column height.
If because the water cooling tube quantity of reinforced wall 6 crosses flowing and the blending that can have influence on gas-particle two-phase in stove at most, therefore the water cooling tube quantity of every sheet reinforced wall 6 is preferably 1 to 4.
Because water cooling tube three face in water-cooled column bight is heated, and need to weld reinforced wall thereon, preferably, the caliber of bight water cooling tube and wall thickness are all suitably increased, make it the water cooling tube being greater than water-cooled column non-corner, increase caliber to increase intraductal working medium flow, increase water cooling tube wall thickness to gain in strength.For reinforced wall 6, be heated because its water cooling tube is two-sided, therefore preferably, the caliber of the water cooling tube of reinforced wall 6 also suitably increases, and is greater than the caliber of the water cooling tube of the non-corner of water-cooled column.
Or as shown in Figure 6, water cooling tube is not established in the bight of water-cooled column 3, adjacent two panels fin panel casing is connected by fin 31; Reinforced wall 6 is vertical, identical with water-cooled column height double-deck fin panel casing, be arranged on water-cooled column bight, respectively with two panels post fin panel casing the water cooling tube on limit is welded by fin forming bight, every layer of water-cooling wall is by fin composition between 1 ~ 4 water cooling tube and pipe thereof.Only one side is towards hearth combustion space for the water cooling tube making reinforced wall like this, and situation of being heated and water-cooled column, burner hearth sidewall water-cooling wall are close, can improve hydrodynamic force security.Close with fin 61 between the water cooling tube of the two-layer water-cooling wall far-end (away from water-cooled column) of reinforced wall, make water-cooling wall carry on the back fiery space of planes not communicate with hearth combustion space, in order to avoid when fuel enters this space, put out a fire because of temperature decrease, cause burning insufficient.Carry on the back fiery space of planes for avoiding reinforced wall water-cooling wall and become enclosure space, the fin connecting adjacent two panels water-cooled column fin panel casing has through hole, makes reinforced wall water-cooling wall carry on the back fiery space of planes and communicate with water-cooled column inner space; Or have the opening communicated with the external world carrying on the back with reinforced wall water-cooling wall on the relevant position on the corresponding burner hearth ceiling of fiery space of planes and/or air distribution plate.Reinforced wall water cooling tube and water-cooled column water cooling tube can select same pipe footpath.
As from the foregoing, alternatively, in CFBB of the present invention, in the bight of described water-cooled column 3, the first fin (corresponding to fin 31 above) extended on the whole height of water-cooled column between adjacent pillars fin panel casing, is utilized to be connected with each other, described reinforced wall 6 comprises two reinforcement fin panel casings be arranged in parallel, the side of a reinforcement fin panel casing and the water cooling tube connected with described first fin of in described adjacent pillars fin panel casing utilize the second fin (corresponding to the fin 13 above mentioned) extended on the whole height of water-cooled column to adjoin one another, and the side of another reinforcement fin panel casing with in described adjacent pillars fin panel casing another utilize the 3rd fin (same correspond to above mention fin 13) extended on the whole height of water-cooled column to adjoin one another with the water cooling tube that described first fin connects, the opposite side of two described reinforcement fin panel casings utilizes the 4th fin (corresponding to the fin 61 above mentioned) extended on the whole height of water-cooled column to adjoin one another, and described first fin is provided with the multiple openings communicated with the inner space of described water-cooled column the inner space of described reinforced wall.
In above CFBB, the angle between each reinforcement fin panel casing and connected post fin panel casing is greater than 90 degree.Angle is larger, and the phenomenon that bight material is concentrated is slighter, can avoid the wearing and tearing of bight water cooling tube.
Advantageously, perpendicular in a water-cooled column cross section of burner hearth center line, described reinforced wall is arranged symmetrically with about the intersection point of described burner hearth center line and described water-cooled column cross section.
Advantageously, described water-cooled column cross section is square, rectangle, regular hexagon or octagon.Each angle as polygonal water-cooled column cross section is provided with a reinforced wall.Further, the angle between all reinforcement fin panel casings and connected corresponding post fin panel casing is identical.This structure is more stable, and this arrangement can not cause harmful effect to efficiency of combustion, avoids the situation that between reinforced wall, region is too concentrated due to cooling wall, caused temperature decrease, causes this zonal combustion insufficient.
After detailed description preferred embodiment of the present invention; those of ordinary skill in the art can clearly understand; various change and change can be carried out under the protection domain not departing from claim of enclosing and spirit, and the present invention is not also limited to the embodiment of examples cited embodiment in description.It should be noted that word " comprises " and do not get rid of other element or step, word "a" or "an" is not got rid of multiple.In addition, any element numbers of claim should not be construed as and limits the scope of the invention.
Claims (13)
1. a CFBB, comprising:
Burner hearth;
Water-cooled column, described water-cooled column is arranged on to enclose in burner hearth and by multi-disc post fin panel casing and forms, angulation between adjacent pillars fin panel casing,
Wherein:
Have at least one reinforced wall formed by water cooling tube extended on the whole height of described water-cooled column in the arranged outside of described water-cooled column in the bight that the adjacent pillars fin panel casing of described multiple post fin panel casing connects, described reinforced wall is outstanding in described burner hearth from described water-cooled column.
2. CFBB according to claim 1, wherein:
Described reinforced wall comprises monolithic reinforcement fin panel casing, and described reinforcement fin panel casing utilizes the fin that extends in the short transverse of water-cooled column and is connected to each other at the water cooling tube in water-cooled column bight.
3. CFBB according to claim 2, wherein:
Described reinforcement fin panel casing comprises 1-4 root water cooling tube.
4. CFBB according to claim 2, wherein:
The diameter of the water cooling tube of described reinforced wall is greater than the diameter not being positioned at the water cooling tube in bight of described water-cooled column.
5. CFBB according to claim 2, wherein:
The diameter of the water cooling tube in described water-cooled column bight and wall thickness are all greater than the diameter not being positioned at the water cooling tube in bight and the wall thickness of water-cooled column.
6. CFBB according to claim 1, wherein:
In the bight of described water-cooled column, the first fin extended on the whole height of water-cooled column between adjacent pillars fin panel casing, is utilized to be connected with each other;
Described reinforced wall comprises two reinforcement fin panel casings be arranged in parallel, the side of a reinforcement fin panel casing utilizes the second fin extended on the whole height of water-cooled column to adjoin one another with the water cooling tube connected with described first fin of in described adjacent pillars fin panel casing, and the side of another reinforcement fin panel casing utilizes the 3rd fin extended on the whole height of water-cooled column to adjoin one another with another the water cooling tube connected with described first fin in described adjacent pillars fin panel casing; And
The opposite side of two described reinforcement fin panel casings utilizes the 4th fin extended on the whole height of water-cooled column to adjoin one another.
7. CFBB according to claim 6, wherein:
Described first fin is provided with the multiple openings communicated with the inner space of described water-cooled column the inner space of described reinforced wall.
8. CFBB according to claim 6, wherein:
Described each reinforcement fin panel casing comprises 1-4 root water cooling tube.
9. the CFBB according to any one of claim 1-8, wherein:
Angle between each reinforcement fin panel casing and connected post fin panel casing is greater than 90 degree.
10. CFBB according to claim 9, wherein:
Perpendicular in a water-cooled column cross section of burner hearth center line, described reinforced wall is arranged symmetrically with about the intersection point of described burner hearth center line and described water-cooled column cross section.
11. CFBBs according to claim 10, wherein:
Described water-cooled column cross section is square, rectangle, regular hexagon or octagon.
12. CFBBs according to claim 11, wherein:
Each angle as polygonal water-cooled column cross section is provided with a reinforced wall.
13. CFBBs according to claim 11, wherein:
Angle between all reinforcement fin panel casings and connected corresponding post fin panel casing is identical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210017752.XA CN103216822B (en) | 2012-01-19 | 2012-01-19 | Circulating fluidized bed boiler having water cooling reinforcement structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210017752.XA CN103216822B (en) | 2012-01-19 | 2012-01-19 | Circulating fluidized bed boiler having water cooling reinforcement structure |
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| CN103216822A CN103216822A (en) | 2013-07-24 |
| CN103216822B true CN103216822B (en) | 2015-06-24 |
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| CN104344401B (en) * | 2013-08-09 | 2016-09-14 | 中国科学院工程热物理研究所 | Boiler hearth of circulating fluidized bed with variable cross-section water-cooled column |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5678497A (en) * | 1996-04-30 | 1997-10-21 | Foster Wheeler Energy International, Inc. | Apparatus for distributing secondary air into a large scale circulating fluidized bed |
| FI105499B (en) * | 1998-11-20 | 2000-08-31 | Foster Wheeler Energia Oy | Process and apparatus in fluidized bed reactor |
| CN100523606C (en) * | 2006-12-07 | 2009-08-05 | 中国科学院工程热物理研究所 | Boiler furnace of circulating fluidized bed with water-cooled column |
| CN101614390A (en) * | 2006-12-07 | 2009-12-30 | 中国科学院工程热物理研究所 | The boiler hearth of circulating fluidized bed of band water-cooled column |
| CN100575782C (en) * | 2007-02-07 | 2009-12-30 | 中国科学院工程热物理研究所 | The boiler hearth of circulating fluidized bed of band heating screen |
| CN101749697A (en) * | 2009-12-22 | 2010-06-23 | 浙江大学 | Circulating fluidized bed boiler hearth with grand-cross penetrating middle wall structure |
| CN201795479U (en) * | 2010-07-28 | 2011-04-13 | 哈尔滨哈锅锅炉工程技术有限公司 | Corner-sealed membrane wall of circulating fluidized bed boiler |
| CN201954534U (en) * | 2011-03-07 | 2011-08-31 | 武汉凯迪工程技术研究总院有限公司 | Extension heated type hearth of biomass circulating fluidized bed boiler |
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Inventor after: Lv Qinggang Inventor after: Gao Ming Inventor after: Song Guoliang Inventor after: Sun Yunkai Inventor after: Wang Xiaofang Inventor after: Zhou Tuo Inventor before: Lv Qinggang Inventor before: Gao Ming Inventor before: Song Guoliang Inventor before: Sun Yunkai Inventor before: Zhang Man Inventor before: Wang Xiaofang Inventor before: Zhou Tuo |
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Free format text: CORRECT: INVENTOR; FROM: LV QINGGANG GAO MING SONG GUOLIANG SUN YUNKAI ZHANG MAN WANG XIAOFANG ZHOUTUO TO: LV QINGGANG GAO MING SONG GUOLIANG SUN YUNKAI WANG XIAOFANG ZHOU TUO |
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