CN103292320A - Circulating fluid bed boiler and fluidizing method using same - Google Patents
Circulating fluid bed boiler and fluidizing method using same Download PDFInfo
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- CN103292320A CN103292320A CN2013102140238A CN201310214023A CN103292320A CN 103292320 A CN103292320 A CN 103292320A CN 2013102140238 A CN2013102140238 A CN 2013102140238A CN 201310214023 A CN201310214023 A CN 201310214023A CN 103292320 A CN103292320 A CN 103292320A
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- deslagging
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Abstract
The invention discloses a circulating fluid bed boiler, which comprises a hearth (1), a first air distribution plate (2), a deslagging pipe (3) and a deslagging bed area (4), wherein the first air distribution plate and the deslagging pipe are arranged at the bottom of the hearth; the deslagging bed area (4) enables slag to be in a fluidized state and is arranged at the outer side of the lower part of the hearth (1) and communicated with the hearth (1); the deslagging pipe (3) is arranged at the bottom of the deslagging bed area (4). The invention discloses a fluidizing method using the circulating fluid bed boiler. The circulating fluid bed boiler can reduce the loss of fine bed materials when slag is discharged, the material fluidity near the deslagging pipe is good, flow dead zones do not exist, the temperature field is uniform, and the heat utilization rate is high.
Description
Technical field
The present invention relates to the thermal power generation field, particularly, relate to the fluidizing method of a kind of CFBB and use CFBB.
Background technology
The clean coal combustion technology that CFBB is wide as a kind of fuel tolerance, efficiency of combustion is high is widely used in the thermal power generation field in recent years.CFBB is mainly with end slag form deslagging, in order to control material stock amount and the height of bed in the bed, prevents big slag deposits, keeping good fluidization conditions, thereby avoids coking, need control deslagging program, opportunity and flow.But, can take away a large amount of heats from the high-temperature ash that CFBB is discharged, and residual in the lime-ash a large amount of S and N and a lot of not fuel and the desulfurizing agent of complete reaction be arranged, these lime-ash can continue to discharge SO outside boiler
2And NO
X, can pollute environment, and the efficient of burning and desulfurization is all lower.For low calorific value coal in high-ash, lime-ash is not cooled off the physics heat loss that can cause more than 2%.In addition, the general ash handling temperature great majority that can bear are between 150 ° of C-300 ° of C, so need cool off lime-ash.
At present, after most of CFBBs adopt the bottom deslagging, end slag directly enters the mode that slag cooler cools off and cools off, but like this when deslagging along with the discharge of the big slag in bottom, the fine grained that has the emulsion zone that is deposited on burner hearth bottom is in a large number also discharged thereupon, cause the loss of thin bed material bigger, and this part thin bed material is for the material balance of keeping in the CFBB, the concentration that guarantees solid particle in the burner hearth is most important, needs the long period could produce certain thin bed after especially some being burnt in burner hearth and expects that the coal that deposits is particularly important especially.Simultaneously, because the bottom deslagging mainly relies on gravity fall, can near slag-drip opening, form the dead band of Flow of Goods and Materials, cause the temperature field inequality, influence the pipe laying heat exchange efficiency, cause the thermal efficiency lower.
Summary of the invention
The fluidizing method that the purpose of this invention is to provide a kind of CFBB and use CFBB, the loss of thin bed material when this CFBB can reduce deslagging, and near the material fluidity the scum pipe is better, there is not flow dead, the temperature field is more even, and heat utilization ratio is higher.
To achieve these goals, an aspect of of the present present invention provides a kind of CFBB, this CFBB comprises burner hearth, is arranged on first air distribution plate and the scum pipe of the bottom of this burner hearth, wherein, described CFBB also comprises be used to making lime-ash form the deslagging bed zone of fluidized state, this deslagging bed zone be arranged on described burner hearth the bottom the outside and be communicated with described burner hearth, described scum pipe is arranged on the bottom in described deslagging bed zone.
Preferably, described CFBB also comprises second air distribution plate, and this second air distribution plate is arranged on the bottom in described deslagging bed zone and is positioned at the top of described scum pipe.
Preferably, described CFBB also comprises heat-exchanging tube bundle, and this heat-exchanging tube bundle is arranged in the described deslagging bed zone and is positioned at the top of described second air distribution plate.
Preferably, described heat-exchanging tube bundle comprises short transverse and the many uniform heat exchanger tubes of width along described deslagging bed zone.
Preferably, be provided with partition wall between described burner hearth and the described deslagging bed zone, the upper and lower of this partition wall is formed with through hole and lower through-hole respectively, and described deslagging bed zone is communicated with described burner hearth by described upward through hole and described lower through-hole.
Preferably, described deslagging bed zone has sidewall and roof, and the roof in described deslagging bed zone forms the acclivitous shape of ecto-entad.
Preferably, the outer wall of the top of the roof that is positioned at described deslagging bed zone of described burner hearth forms water-cooling wall.
Preferably, sidewall and the roof in described deslagging bed zone form by water cooling tube.
Preferably, the top of described burner hearth is provided with exhaust outlet.
Another aspect of the present invention provides a kind of fluidizing method that uses CFBB, wherein, described CFBB is CFBB recited above, dry in described burner hearth by described first air distribution plate, making material form fluid bed in described burner hearth burns, the lime-ash that burning back produces wind-force effect current downflow in the described deslagging bed zone again fluidisation form the deslagging bed, bigger lime-ash is discharged from described scum pipe, and less lime-ash flow in the described burner hearth recycling again.
Pass through technique scheme, CFBB of the present invention is dried in burner hearth by first air distribution plate, fluidisation forms fluid bed in burner hearth to make material (mainly being coal dust), thereby in burner hearth, burn, and the bottom of burner hearth forms emulsion zone, the ash deposition that the burning back produces is at emulsion zone and in wind-force effect current downflow arrives deslagging bed zone, lime-ash in deslagging bed zone again fluidisation form the deslagging bed, bigger lime-ash is discharged from scum pipe, and less lime-ash flow in the burner hearth recycling again.Therefore, the loss of thin bed material (less lime-ash) made that the fluidisation of CFBB is better when this CFBB can reduce deslagging, improve the efficient of burning and desulfurization, and near the material fluidity the scum pipe is better, does not have flow dead, and the temperature field is more even.
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 following specific embodiment one, but is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the cutaway view of the CFBB of the specific embodiment of the present invention;
Fig. 2 is the A-A cutaway view of the CFBB of the specific embodiment of the present invention.
Description of reference numerals
1 burner hearth, 2 first air distribution plates
3 scum pipes, 4 deslagging bed zones
5 second air distribution plates, 6 heat-exchanging tube bundles
Through hole on 7 partition walls 8
9 lower through-holes, 10 exhaust outlets
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.
In the present invention, do not doing under the situation of opposite explanation, the noun of locality that uses typically refers to as shown in Figure 1 higher position and lower position along short transverse as " upper and lower ", and " inside and outside " refers to position and the deep position at close center along its length as shown in Figure 1.
As shown in Figure 1, an aspect of of the present present invention provides a kind of CFBB, this CFBB comprises burner hearth 1, is arranged on first air distribution plate 2 and the scum pipe 3 of the bottom of this burner hearth 1, wherein, described CFBB also comprises be used to making lime-ash form the deslagging bed zone 4 of fluidized state, this deslagging bed zone 4 be arranged on described burner hearth 1 the bottom the outside and be communicated with described burner hearth 1, described scum pipe 3 is arranged on the bottom in described deslagging bed zone 4.
CFBB of the present invention is dried in burner hearth 1 by first air distribution plate 2, fluidisation forms fluid bed in burner hearth 1 to make material (mainly being coal dust), thereby in burner hearth 1, burn, and the bottom of burner hearth 1 forms emulsion zone, the ash deposition that the burning back produces is at emulsion zone and in wind-force effect current downflow arrives deslagging bed zone 4, lime-ash in deslagging bed zone 4 again fluidisation form the deslagging bed, bigger lime-ash is discharged from scum pipe 3, and less lime-ash flow in the burner hearth 1 recycling again.Therefore, the loss of thin bed material (less lime-ash) made that the fluidisation of CFBB is better when this CFBB can reduce deslagging, improve the efficient of burning and desulfurization, and near the material fluidity the scum pipe 3 is better, does not have flow dead, and the temperature field is more even.
Wherein, as depicted in figs. 1 and 2, deslagging bed zone 4 is arranged in the both sides of burner hearth 1 symmetrically and is higher than the emulsion zone of burner hearth 1, is set to 3m～5m usually, makes fully fluidisation of less lime-ash.
As shown in Figure 1, in order to make lime-ash abundant fluidisation in deslagging bed zone 4, preferably, described CFBB also comprises second air distribution plate 5, and this second air distribution plate 5 is arranged on the bottom in described deslagging bed zone 4 and is positioned at the top of described scum pipe 3.Dry in deslagging bed zone 4 by second air distribution plate 5, make less lime-ash form fluidized state, and then flow and to turn back to burning again in the burner hearth 1, and bigger lime-ash is discharged from scum pipe 3, scum pipe 3 is arranged on the center of second air distribution plate 5 usually, so that the discharge of lime-ash.
In order to take full advantage of, reclaim the heat that has in the lime-ash, as shown in Figure 1, preferably, described CFBB also comprises heat-exchanging tube bundle 6, and this heat-exchanging tube bundle 6 is arranged in the described deslagging bed zone 4 and is positioned at the top of described second air distribution plate 5.Lime-ash enters deslagging bed zone 4 back contacts with heat-exchanging tube bundle 6 and carries out exchange heat, thereby the heat in the lime-ash can be recycled, improve the heat utilization ratio of CFBB, and reduce from the temperature of the bigger lime-ash of scum pipe 3 discharges, reduce the live load of slag cooler.
In order to make lime-ash fully contact with heat-exchanging tube bundle 6, as depicted in figs. 1 and 2, preferably, described heat-exchanging tube bundle 6 comprises along the short transverse in described deslagging bed zone 4 and many uniform heat exchanger tubes of width.The contact area that many heat exchanger tubes can increase lime-ash and heat-exchanging tube bundle 6 is set, improves heat exchange efficiency, take full advantage of the heat in the lime-ash, cut down the consumption of energy.
In order to guarantee that lime-ash circulates between burner hearth 1 and deslagging bed zone 4, as shown in Figure 1, preferably, be provided with partition wall 7 between described burner hearth 1 and the described deslagging bed zone 4, the upper and lower of this partition wall 7 is formed with through hole 8 and lower through-hole 9 respectively, and described deslagging bed zone 4 is communicated with described burner hearth 1 by described upward through hole 8 and described lower through-hole 9.Referring to the Flow of Goods and Materials route shown in the arrow of Fig. 1, the lime-ash major sedimentary that material forms in burner hearth 1 internal combustion is at the emulsion zone of burner hearth 1 bottom, lime-ash is flow in the deslagging bed zone 4 by lower through-hole 9 from emulsion zone, and passing through abundant fluidisation under the wind-force effect of second air distribution plate 5, less lime-ash is flowed by last through hole 8 and turns back in the burner hearth 1 fluidized bed combustion again, bigger ash deposition is discharged by scum pipe 3 in the bottom in deslagging bed zone 4, thereby forms the recycling of material in the inside of CFBB.Partition wall 7 adopts refractory material to make usually.
In order to guide the less lime-ash in the deslagging bed zone 4 to be flowed in the burner hearth 1 by deslagging bed zone 4, as shown in Figure 1, preferably, described deslagging bed zone 4 has sidewall and roof, the roof in described deslagging bed zone 4 forms the acclivitous shape of ecto-entad, thereby the lime-ash of fluidisations can flow along roof in the deslagging bed zone 4, makes less lime-ash can inwardly flow in the burner hearth 1 fluidized bed combustion again.The roof in deslagging bed zone 4 and horizontal direction form 30 °～60 ° angle α, make that the flowability of less lime-ash is better.
In order to take full advantage of the heat that the material burning produces, preferably, the outer wall of the top of the roof that is positioned at described deslagging bed zone 4 of described burner hearth 1 forms water-cooling wall.Water-cooling wall fully absorbs the heat that burner hearth 1 internal combustion produces, and has both guaranteed the normal operation of CFBB, the heat that can utilize the material burning to produce again.
In order to take full advantage of the heat that has in the lime-ash, preferably, sidewall and the roof in described deslagging bed zone 4 form by water cooling tube.Water cooling tube can fully absorb the heat that has in the lime-ash, has both guaranteed the normal operation of CFBB, can utilize the heat in the lime-ash again.
As shown in Figure 1, in order to discharge the waste gas that burner hearth 1 internal combustion produces, preferably, the top of described burner hearth 1 is provided with exhaust outlet 10, the waste gas that burner hearth 1 internal combustion produces is discharged by exhaust outlet 10, and separates by cyclone separator, reaches emission request to guarantee waste gas.
Another aspect of the present invention provides a kind of fluidizing method that uses CFBB, wherein, described CFBB is CFBB recited above, dry in described burner hearth 1 by described first air distribution plate 2, making material form fluid bed in described burner hearth 1 burns, the lime-ash that burning back produces wind-force effect current downflow in the described deslagging bed zone 4 again fluidisation form the deslagging bed, bigger lime-ash is discharged from described scum pipe 3, and less lime-ash flow in the described burner hearth 1 recycling again.
Solid particle in the burner hearth 1 of CFBB dense, especially form emulsion zone in the bottom of burner hearth 1, a large amount of deposition materials is arranged in the emulsion zone, and these materials are oarse-grained lime-ash mostly, form the circulation of material between the emulsion zone of deslagging bed zone 4 and burner hearth 1, material flows into deslagging bed zone 4 back fluidisations in deslagging bed zone 4, fluidising air velocity in the maintenance deslagging bed zone 4 is higher than the fluidising air velocity of burner hearth 1, less lime-ash can turn back in the burner hearth 1, make deslagging bed zone 4 form small-sized fluid bed, wherein, the solid lime-ash can carry out heat exchange, guarantee higher heat exchange efficiency, lime-ash is difficult for forming flow dead simultaneously.
Because scum pipe 3 is arranged in the bottom in deslagging bed zone 4, can be by the fluidized wind fluidisation in the deslagging bed zone 4 after bigger lime-ash enters deslagging bed zone 4, and can move downward under the gravity effect through after the sufficient heat exchange, finally from scum pipe 3 discharges.Less lime-ash also can carry out sufficient heat exchange after entering deslagging bed zone 4, because the fluidising air velocity in deslagging bed zone 4 is higher than the fluidising air velocity of burner hearth 1, less lime-ash is blown the emulsion zone that is back to burner hearth 1 and recycles.So both guaranteed the discharge of big slag, make thin bed material can be deposited in the burner hearth 1 again, and solved that smaller particles is difficult for retaining, have flow dead near the scum pipe 3, underused the problem of heat.
Below describe preferred embodiment of the present invention by reference to 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.
Need to prove in addition, each concrete technical characterictic described in the above-mentioned specific embodiment under reconcilable situation, can make up by any suitable manner, for fear of unnecessary repetition, the present invention is to the explanation no longer separately of various possible compound modes.
In addition, also can carry out any combination 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.
Claims (10)
1. CFBB, this CFBB comprises burner hearth (1), is arranged on first air distribution plate (2) and the scum pipe (3) of the bottom of this burner hearth (1), it is characterized in that, described CFBB also comprises be used to making lime-ash form the deslagging bed zone (4) of fluidized state, this deslagging bed zone (4) be arranged on described burner hearth (1) the bottom the outside and be communicated with described burner hearth (1), described scum pipe (3) is arranged on the bottom in described deslagging bed zone (4).
2. CFBB according to claim 1, it is characterized in that, described CFBB also comprises second air distribution plate (5), and this second air distribution plate (5) is arranged on the bottom in described deslagging bed zone (4) and is positioned at the top of described scum pipe (3).
3. CFBB according to claim 1 and 2, it is characterized in that, described CFBB also comprises heat-exchanging tube bundle (6), and this heat-exchanging tube bundle (6) is arranged in the described deslagging bed zone (4) and is positioned at the top of described second air distribution plate (5).
4. CFBB according to claim 3 is characterized in that, described heat-exchanging tube bundle (6) comprises along the short transverse in described deslagging bed zone (4) and many uniform heat exchanger tubes of width.
5. CFBB according to claim 1, it is characterized in that, be provided with partition wall (7) between described burner hearth (1) and the described deslagging bed zone (4), the upper and lower of this partition wall (7) is formed with through hole (8) and lower through-hole (9) respectively, and described deslagging bed zone (4) is communicated with described burner hearth (1) by described upward through hole (8) and described lower through-hole (9).
6. CFBB according to claim 1 is characterized in that, described deslagging bed zone (4) has sidewall and roof, and the roof in described deslagging bed zone (4) forms the acclivitous shape of ecto-entad.
7. CFBB according to claim 1 is characterized in that, the outer wall of the top of the roof that is positioned at described deslagging bed zone (4) of described burner hearth (1) forms water-cooling wall.
8. CFBB according to claim 1 is characterized in that, sidewall and the roof in described deslagging bed zone (4) form by water cooling tube.
9. CFBB according to claim 1 is characterized in that, the top of described burner hearth (1) is provided with exhaust outlet (10).
10. fluidizing method that uses CFBB, wherein, described CFBB is according to any described CFBB among the claim 1-9, dry in described burner hearth (1) by described first air distribution plate (2), making material form fluid bed in described burner hearth (1) burns, the lime-ash that burning back produces wind-force effect current downflow in the described deslagging bed zone (4) again fluidisation form the deslagging bed, bigger lime-ash is discharged from described scum pipe (3), and less lime-ash flow in the described burner hearth (1) recycling again.
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| CN2013102140238A CN103292320A (en) | 2013-05-31 | 2013-05-31 | Circulating fluid bed boiler and fluidizing method using same |
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| CN2013102140238A CN103292320A (en) | 2013-05-31 | 2013-05-31 | Circulating fluid bed boiler and fluidizing method using same |
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| CN105180161A (en) * | 2015-08-14 | 2015-12-23 | 东方电气集团东方锅炉股份有限公司 | Fluidized-bed boiler with multiple wind distribution plates and built-in heat exchanger |
| CN107448932A (en) * | 2017-09-19 | 2017-12-08 | 安徽科达洁能股份有限公司 | A kind of air-distribution device of fluidized-bed reactor |
| CN110523328A (en) * | 2019-09-29 | 2019-12-03 | 东北大学 | A kind of partition board type internal circulation fluidized bed particle mixing arrangement |
| CN111602004A (en) * | 2017-11-29 | 2020-08-28 | 川崎重工业株式会社 | Fluidized bed monitoring method and apparatus |
| CN114135865A (en) * | 2021-12-20 | 2022-03-04 | 重庆大学 | High-temperature ash storage device and circulating fluidized bed boiler provided with same |
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| CN105180161A (en) * | 2015-08-14 | 2015-12-23 | 东方电气集团东方锅炉股份有限公司 | Fluidized-bed boiler with multiple wind distribution plates and built-in heat exchanger |
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| CN110523328A (en) * | 2019-09-29 | 2019-12-03 | 东北大学 | A kind of partition board type internal circulation fluidized bed particle mixing arrangement |
| CN114135865A (en) * | 2021-12-20 | 2022-03-04 | 重庆大学 | High-temperature ash storage device and circulating fluidized bed boiler provided with same |
| CN114135865B (en) * | 2021-12-20 | 2024-02-27 | 重庆大学 | High-temperature ash storage device and circulating fluidized bed boiler with same |
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Inventor after: Zhu Zaixing Inventor after: Ling Wen Inventor after: Lei Xiujian Inventor after: Zhang Yong Inventor after: Yang Hairui Inventor after: Zhang Wenqing Inventor after: Liang Zhihong Inventor after: Kuang Wei Inventor after: Xin Shengwei Inventor before: Zhu Zaixing Inventor before: Lei Xiujian Inventor before: Zhang Yong Inventor before: Yang Hairui Inventor before: Zhang Wenqing Inventor before: Liang Zhihong Inventor before: Kuang Wei Inventor before: Xin Shengwei |
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Free format text: CORRECT: INVENTOR; FROM: ZHU ZAIXING LEI XIUJIAN ZHANG YONG YANG HAIRUI ZHANG WENQING LIANG ZHIHONGKUANG WEI XIN SHENGWEI TO: ZHU ZAIXING LING WEN LEI XIUJIAN ZHANG YONG YANG HAIRUI ZHANG WENQING LIANG ZHIHONG KUANG WEI XIN SHENGWEI |
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Application publication date: 20130911 |