CN101943401A - Air distribution method for circulating fluidized bed boiler - Google Patents
Air distribution method for circulating fluidized bed boiler Download PDFInfo
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- CN101943401A CN101943401A CN 201010210093 CN201010210093A CN101943401A CN 101943401 A CN101943401 A CN 101943401A CN 201010210093 CN201010210093 CN 201010210093 CN 201010210093 A CN201010210093 A CN 201010210093A CN 101943401 A CN101943401 A CN 101943401A
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- air
- bed material
- air distribution
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- material thickness
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000000463 material Substances 0.000 claims abstract description 63
- 238000003466 welding Methods 0.000 claims description 2
- 239000002893 slag Substances 0.000 abstract description 3
- 238000005243 fluidization Methods 0.000 description 14
- 239000004744 fabric Substances 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000009835 boiling Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
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Abstract
The invention provides an air distribution method for a circulating fluidized bed boiler. The method comprises the following steps of: supplying air to a hearth of the circulating fluidized bed boiler by an air distributor, wherein the air distributor comprises an air distributing plate, a plurality of air pipes passing through the air distributing plate to extend and air caps arranged on each air pipe, and a hole is formed on each air cap and communicated with each air pipe; and reducing air volume in an area with a thinner bed material in the hearth, and increasing the air volume in the area with a thicker bed material in the hearth. According to the technical scheme of the invention, the air volume in the area with the thinner bed material is reduced, while the air volume in the area with the thicker bed material is correspondingly increased; or the air volume of the area with the thicker bed material is increased, while the air volume of the area with the thinner bed material is correspondingly reduced. Thus, air of different grade (air volume) can be supplied according to the thickness distribution of the bed material on the whole bed surface, and the aims of grading air distribution and uniform fluidizing are fulfilled; and the efficiency of the circulating fluidized bed boiler is improved and the problems of air cap wear and slag leakage can also be solved radically.
Description
Technical field
The present invention relates to the CFBB air distribution method.
Background technology
CFBB utilizes Combustion technology of circulating fluidized, has advantages such as fuel tolerance is good, efficient is high, disposal of pollutants is few.Wherein, fluidisation realizes by following manner: make the burning required air evenly enter fluid bed by the air distribution plate of burner hearth bottom, keep the suitable air-flow rate of climb in fluid bed, this air-flow holds up major part bed material particle and moves up and down, become the boiling shape, thereby blending is very strong.This shows that ventilating system is the key of whole combustion system.
In CFBB, blower fan provides air to the air preheater preheating, and the air of preheating enters the burner hearth bottom air compartment, and enters burner hearth to participate in burning from the bottom air compartment through air-distribution device.Wherein, the air-distribution device of CFBB is the core link that makes a materials flowization.As depicted in figs. 1 and 2, described air-distribution device comprises air distribution plate 1, pass a plurality of airducts 2 that this air distribution plate 1 extends and be installed in blast cap 3 on each airduct 2, blast cap 3 is provided with perforate 3a, air enters each airduct 2 and enters burner hearth by the perforate 3a that is installed in the blast cap 3 on each airduct 2 from the bottom air compartment, thereby provides air-flow to burner hearth.But during actual the use, the phenomenon of bed surface fluidisation inequality in burner hearth appears in regular meeting (being the bed materials flow degree difference of bed surface zones of different), thus causing a materials flow degradation, the bed temperature deviation is serious.Use for a long time in this case, the inhomogeneous fluidisation of bed material can produce eddy current near blast cap, thus heavy wear blast cap and cause Lou accident such as slag.
Summary of the invention
Technical problem to be solved by this invention provides a kind of CFBB air distribution method, and this air distribution method can be realized the even fluidisation of bed surface.
The present inventor is through discovering, cause the reason of bed surface fluidisation inequality to be that the material that circulates can glide along the sidewall of burner hearth at circulation time in burner hearth, thereby bed material thickness is greater than the bed material thickness of central area around the burner hearth, cause bed material uneven thickness, provide the wind of identical air quantity, wind speed can cause whole bed surface current inequality the different zone of bed material thickness.In addition, little bed surface fluidisation difficulty or the fluidisation inequality of also can causing of cloth wind resistance.
For solving the problems of the technologies described above, the invention provides a kind of CFBB air distribution method, this method comprises: by the burner hearth air feed of air-distribution device to CFBB, described air-distribution device comprises air distribution plate, pass a plurality of airducts that this air distribution plate extends and be installed in blast cap on each airduct, has the perforate that is communicated with described airduct on this blast cap; The less zone of bed material thickness in described burner hearth reduces air quantity, and the bigger zone of bed material thickness in described burner hearth increases air quantity.
By technique scheme of the present invention, reduce the air quantity of bed material thickness zonule, thereby increased the air quantity in a zone that material thickness is big relatively; Perhaps increase the air quantity in the big zone of bed material thickness, thereby reduced the air quantity of bed material thickness zonule relatively.By this layout, can provide the wind of different stage (air quantity) according to the bed material thickness distribution of whole bed surface, thereby reach the purpose of classification cloth wind, even fluidisation.Thereby not only improved the efficient of CFBB, can also fundamentally solve the blast cap wearing and tearing and leak the slag problem.
Other features and advantages of the present invention will partly be described in detail in the specific embodiment subsequently.
Description of drawings
Accompanying drawing is to be used to provide further understanding of the present invention, and constitutes the part of specification, is used from explanation the present invention with the specific embodiment of the present invention one, but is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the schematic diagram that shows the assembly relation of air-distribution device;
Fig. 2 is the structural representation that shows the airduct of existing air-distribution device;
Fig. 3 shows the structural representation that is provided with the airduct of throttle in the air-distribution device of one embodiment of the present invention;
Fig. 4 is the structural representation of blast cap of central area that shows the air-distribution device of another embodiment of the invention.
Description of reference numerals
1: air distribution plate 2: airduct
3: blast cap 3a: first perforate
3b: second perforate 4: throttle
The specific embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is elaborated.Should be understood that the specific embodiment described herein only is used for description and interpretation the present invention, is not limited to the present invention.
CFBB air distribution method of the present invention comprises: by the burner hearth air feed of air-distribution device to CFBB, described air-distribution device comprises air distribution plate 1, pass a plurality of airducts 2 that this air distribution plate 1 extends and be installed in blast cap 3 on each airduct 2, has the perforate that is communicated with described airduct 2 on this blast cap 3; The less zone of bed material thickness in described burner hearth reduces air quantity, and the bigger zone of bed material thickness in described burner hearth increases air quantity.
Wherein, can take appropriate measures in the air quantity in a reduction zone that material thickness is less that takes appropriate measures increases the air quantity that bed is expected the zone that thickness is bigger, also can optionally take a measure that reduces a measure of the air quantity in the zone that material thickness is less or take to increase the air quantity in the bigger zone of bed material thickness.For example, when reducing the air quantity in the less zone of bed material thickness when taking appropriate measures, because wind is provided in the burner hearth by described air-distribution device, the total amount that promptly is provided to the wind in the burner hearth is constant, thereby reduces bed and expect that the air quantity in the zone that thickness is less can other regional air quantity of corresponding increase.
In the air distribution method of the present invention, zone that bed material thickness is less and the bigger zone of bed material thickness can be determined by the actual motion CFBB.Just determine the bed material thickness of each position on the bed surface by the actual motion CFBB.In addition, can determine to divide the less or bigger standard of bed material thickness according to actual conditions, for example can think that bed material thickness is the less zone of bed material thickness less than the zone of the average thickness of the bed material of whole bed surface, and bed material thickness be that bed is expected the bigger zone of thickness greater than the zone of the average thickness of the bed material of whole bed surface.
As mentioned above, because recycle stock can glide along the sidewall of burner hearth at circulation time in the burner hearth, thereby bed material thickness is greater than the bed material thickness of central area around the burner hearth, thereby in the method for the invention, think that the central area of air distribution plate 1 is the less zone of bed material thickness, all the other zones of air distribution plate 1 are the bigger zones of bed material thickness.
According to the CFBB of different model, the size of central area can change, and promptly the bed material thickness distribution of whole bed surface can change.Preferably, described central area accounts for the 1/3-2/3 in the whole zone of described air distribution plate.
In the air distribution method of the present invention, can adopt various measures and reduce air quantity or increase air quantity, reduce the operation of the air quantity in the less zone of bed material thickness below by two kinds of specific embodiment explanations.
First embodiment
In first embodiment of the present invention, as shown in Figure 3,, can be provided with throttle 4 in the airduct 2, thereby reduce this regional air quantity by the flow area that reduces the less zone of bed material thickness in the less zone (central area) of described bed material thickness.
By in the airduct 2 in the less zone of bed material thickness, throttle 4 being set, can reduce the flow area of this part airduct 2 on the one hand, be provided to air quantity in the burner hearth thereby relatively reduce by this part airduct 2, thereby the air quantity that can corresponding increase provides by all the other airducts 2; Can increase the cloth wind resistance by throttle 4 on the other hand, thereby remedy the little defective of cloth wind resistance, make that bed easier fluidisation of material and fluidisation are even.In addition, under the constant situation of the air quantity that the bottom air compartment provides, throttle 4 makes the flow area of whole air-distribution device reduce, and expects that the bigger zone of thickness is provided to the wind speed in the burner hearth thereby can increase to some extent by bed material thickness less zone and bed, thereby can improve fluidization quality.Selectively, can also regulate the air quantity that the bottom air compartment provides according to actual conditions.
For required air quantity being provided and suitably improving the cloth wind resistance and be convenient to layout, can make each airduct 2 have identical internal diameter, and make the airduct 2 interior throttles 4 of central area have identical internal diameter.
Selectively and since the thickness of bed material from the central area towards around increase gradually, when each airduct 2 has identical internal diameter, the internal diameter that can make each throttle 4 from the central area towards around reduce gradually, to satisfy the requirement of classification cloth wind better.Preferably, the internal diameter of throttle 4 is 3 with the ratio of the internal diameter of airduct 2: 5-4: 5.For example, when the internal diameter of airduct 2 was 3.5cm, the internal diameter of throttle 4 can be 2.1-2.8cm.
In addition, can make throttle 4 seal weldings on the inwall of airduct 2, thereby throttle 4 firmly is set, and in described central area, wind can only be provided in the burner hearth by throttle 4, thereby reduce the flow area of airduct 2 by throttle 4 effectively.For example, 4 of throttles can be welded on the inwall of airduct 2, make not have the gap between throttle 4 and the airduct 2, to reach the effect that is tightly connected between throttle 4 and the airduct 2.
Second embodiment
In second embodiment of the present invention, as shown in Figure 4, in the less zone (central area) of described bed material thickness, the aperture of the perforate 3b of blast cap 3 is less than the aperture of the perforate 3a of other regional blast cap 3, thereby reduces this regional air quantity by a flow area that reduces the less zone of bed material thickness.For convenience of explanation, hereinafter bed is expected that the perforate of the blast cap 3 in the zone that thickness is less is defined as the second perforate 3b, the perforate of other regional blast cap 3 is defined as the first perforate 3a.
Wherein, the internal diameter of each airduct 2 is identical, thereby by reducing second a perforate 3b of the blast cap 3 of the central area that material thickness is less, can reduce the flow area of this part airduct 2 on the one hand, be provided to air quantity in the burner hearth thereby relatively reduce by corresponding airduct 2, thus the air quantity that can corresponding increase provides by all the other airducts 2; Can increase the cloth wind resistance by the second perforate 3b that the aperture reduces on the other hand, thereby remedy the little defective of cloth wind resistance, make that bed easier fluidisation of material and fluidisation are even.In addition, under the constant situation of the air quantity that the bottom air compartment provides, the aperture of the second perforate 3b reduces to make that the flow area of whole air-distribution device reduces, expect that the bigger zone of thickness is provided to the wind speed in the burner hearth thereby can increase to some extent, thereby can improve fluidization quality by bed material thickness less zone and bed.Selectively, can also regulate the air quantity that the bottom air compartment provides according to actual conditions.
For required air quantity being provided and suitably improving the cloth wind resistance and be convenient to layout, can make the blast cap 3 of central area have the second identical perforate 3b of aperture, and make all the other regional blast caps 3 have the first identical perforate 3a of aperture.
Selectively and since the thickness of bed material from the central area towards around increase gradually, the aperture that can make each first perforate 3a from the central area towards around increase gradually.Preferably, making the ratio in aperture and the aperture of the first perforate 3a of all the other regional blast caps 3 of the second perforate 3b of the blast cap 3 of central area is 3: 5-4: 5.For example, the aperture of the first perforate 3a is 8-15mm, and the aperture of the second perforate 3b is 6-12mm.
Need to prove that each the concrete technical characterictic described in the above-mentioned specific embodiment can make up arbitrarily by any suitable manner, it falls within the scope disclosed in this invention equally.In addition, also can make up arbitrarily between the various embodiment of the present invention, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Below describe preferred implementation of the present invention in conjunction with the accompanying drawings in detail; but; the present invention is not limited to the detail in the above-mentioned embodiment; in technical conceive scope of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
Claims (8)
1. CFBB air distribution method, this method comprises:
By the burner hearth air feed of air-distribution device to CFBB, described air-distribution device comprises air distribution plate (1), pass a plurality of airducts (2) that this air distribution plate (1) extends and be installed in blast cap (3) on each airduct (2), has the perforate that is communicated with described airduct (2) on this blast cap (3);
The less zone of bed material thickness in described burner hearth reduces air quantity, and the bigger zone of bed material thickness in described burner hearth increases air quantity.
2. air distribution method according to claim 1 wherein, in the less zone of described bed material thickness, is provided with throttle (4) in the described airduct (2).
3. air distribution method according to claim 2, wherein, the ratio of the internal diameter of the internal diameter of described throttle (4) and described airduct (2) is 3: 5-4: 5.
4. air distribution method according to claim 3, wherein, described throttle (4) seal welding is on the inwall of described airduct (2).
5. air distribution method according to claim 1, wherein, in the less zone of described bed material thickness, the aperture of the perforate (3b) of described blast cap (3) is less than the aperture of the perforate (3a) of other regional blast cap (3).
6. air distribution method according to claim 5, wherein, the ratio in the aperture of the aperture of the perforate (3b) of the blast cap (3) in the zone that described bed material thickness is less and the perforate (3a) of other regional blast cap (3) is 3: 5-4: 5.
7. according to any described air distribution method among the claim 1-6, wherein, the less zone of described bed material thickness is the central area of described air distribution plate (1), and the zone that described thickness is bigger is all the other zones of described air distribution plate (1).
8. air distribution method according to claim 7, wherein, described central area accounts for the 1/3-2/3 in the whole zone of described air distribution plate (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102100932A CN101943401B (en) | 2010-06-18 | 2010-06-18 | Air distribution method for circulating fluidized bed boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102100932A CN101943401B (en) | 2010-06-18 | 2010-06-18 | Air distribution method for circulating fluidized bed boiler |
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| Publication Number | Publication Date |
|---|---|
| CN101943401A true CN101943401A (en) | 2011-01-12 |
| CN101943401B CN101943401B (en) | 2011-09-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010102100932A Active CN101943401B (en) | 2010-06-18 | 2010-06-18 | Air distribution method for circulating fluidized bed boiler |
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| CN (1) | CN101943401B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103075728A (en) * | 2013-02-04 | 2013-05-01 | 太原锅炉集团有限公司 | Flow-reconstruction based circulating fluidized bed boiler for controlling nitric oxide |
| CN103335306A (en) * | 2013-07-09 | 2013-10-02 | 东方电气集团东方锅炉股份有限公司 | Air distribution system and method of circulating fluidized bed boiler |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4387667A (en) * | 1981-12-14 | 1983-06-14 | Combustion Engineering, Inc. | Fluidized bed distributor plate assembly |
| JP3024746B2 (en) * | 1997-01-13 | 2000-03-21 | 株式会社栗本鐵工所 | Fluidizing air nozzle |
| CN2516827Y (en) * | 2001-12-09 | 2002-10-16 | 毕思更 | Split nozzle button for recirculating fluidized-bed boiler |
| CN2532367Y (en) * | 2002-03-19 | 2003-01-22 | 李志刚 | Wind cap for boiler |
| CN2554475Y (en) * | 2002-07-29 | 2003-06-04 | 张善学 | Large nozzle button |
| CN2709806Y (en) * | 2004-03-19 | 2005-07-13 | 烟台华鲁热电工程技术有限公司 | Bell nozzle button of recirculating fluidized bed boiler |
| CN1786566A (en) * | 2005-12-09 | 2006-06-14 | 西安热工研究院有限公司 | Adjustable air distributor for circulating fluidized bed boiler |
| JP2009204196A (en) * | 2008-02-26 | 2009-09-10 | Mitsubishi Heavy Ind Ltd | Fluidized bed boiler structure |
| CN101543754A (en) * | 2008-03-26 | 2009-09-30 | 中国科学院工程热物理研究所 | Embedded type cylindrical blast cap with throttling block |
| CN201335375Y (en) * | 2008-11-26 | 2009-10-28 | 东方锅炉（集团）股份有限公司 | Air distributor structure for circulating fluidized bed boiler |
-
2010
- 2010-06-18 CN CN2010102100932A patent/CN101943401B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4387667A (en) * | 1981-12-14 | 1983-06-14 | Combustion Engineering, Inc. | Fluidized bed distributor plate assembly |
| JP3024746B2 (en) * | 1997-01-13 | 2000-03-21 | 株式会社栗本鐵工所 | Fluidizing air nozzle |
| CN2516827Y (en) * | 2001-12-09 | 2002-10-16 | 毕思更 | Split nozzle button for recirculating fluidized-bed boiler |
| CN2532367Y (en) * | 2002-03-19 | 2003-01-22 | 李志刚 | Wind cap for boiler |
| CN2554475Y (en) * | 2002-07-29 | 2003-06-04 | 张善学 | Large nozzle button |
| CN2709806Y (en) * | 2004-03-19 | 2005-07-13 | 烟台华鲁热电工程技术有限公司 | Bell nozzle button of recirculating fluidized bed boiler |
| CN1786566A (en) * | 2005-12-09 | 2006-06-14 | 西安热工研究院有限公司 | Adjustable air distributor for circulating fluidized bed boiler |
| JP2009204196A (en) * | 2008-02-26 | 2009-09-10 | Mitsubishi Heavy Ind Ltd | Fluidized bed boiler structure |
| CN101543754A (en) * | 2008-03-26 | 2009-09-30 | 中国科学院工程热物理研究所 | Embedded type cylindrical blast cap with throttling block |
| CN201335375Y (en) * | 2008-11-26 | 2009-10-28 | 东方锅炉（集团）股份有限公司 | Air distributor structure for circulating fluidized bed boiler |
Non-Patent Citations (1)
| Title |
|---|
| 《全国电力行业CFB机组技术交流服务协作网第四届年会技术交流论文集(七)》 20051231 王贺岑,王冠文,沈辉,夏大伟 CFB锅炉运行存在的问题分析与探讨 第94-96页第3.1小节风量的调整控制 1 , 2 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103075728A (en) * | 2013-02-04 | 2013-05-01 | 太原锅炉集团有限公司 | Flow-reconstruction based circulating fluidized bed boiler for controlling nitric oxide |
| CN103335306A (en) * | 2013-07-09 | 2013-10-02 | 东方电气集团东方锅炉股份有限公司 | Air distribution system and method of circulating fluidized bed boiler |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101943401B (en) | 2011-09-07 |
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