CN2080421U - Circular air-distributing device for strengthening internal cycle in fluidized bed - Google Patents
Circular air-distributing device for strengthening internal cycle in fluidized bed Download PDFInfo
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- CN2080421U CN2080421U CN 90225649 CN90225649U CN2080421U CN 2080421 U CN2080421 U CN 2080421U CN 90225649 CN90225649 CN 90225649 CN 90225649 U CN90225649 U CN 90225649U CN 2080421 U CN2080421 U CN 2080421U
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- air
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- type distribution
- distribution grid
- fluidized bed
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Abstract
The utility model relates to a circular air-distributing device for strengthening internal cycle in a fluidized bed, mainly comprising a central even sidestream type distribution plate 1, a periphery-oriented transverse-blast type distribution plate 2 which surrounds the periphery of the central distribution plate 1, independent air chambers 8, 9, etc. When the utility model works, the fluidized bed produces big circulation in the middle and small circulation in peripheral walls under the action of lifting air and transversely blasting air. The integral circular effects of air-solid transversal convection, disturbance and mixing are strengthened, the efficiency of combustion is increased, and the abrasion of relevant boiler elements is decreased. Owing to the convenient operation control, wide coal applicability and strong load applicability, the utility model is particularly suitable for a boiler for a circular fluidized bed with low carrying rate, and is suitable for other industrial occasions.
Description
The utility model relates to the air distribution device of circulation in the fluid bed operation reinforcement bed, is the interior air-distribution device that circulates and need of stove that is specially adapted to cycling fuidized bed boiler with low carrying rate.
Fluidisation attitude burning is a kind of combustion system between laminar burning and suspension combustion, and there is a stable ignition temperature field in its gas-solid good mixing, favored by people with high strength, combustion with reduced pollutants especially.But the airflow-distribution board of fluid bed commonly used mainly is even gas distribution, so the gas-solid good mixing of the interior vertical direction of fluid bed, and horizontal gas-solid mixing is just not good enough, for fluidized-bed combustion boiler, because of fuel in the bed is the heterogeneity size distribution.Cause the imperfect combustion of fuel easily, a large amount of uncombusted particulates are taken out of by flue gas because of the time of staying in bed is short, cause that fuel availability is low, heat loss is big, and because the dust contained flue gas of taking out of is many, relevant heating surface and metope to boiler produce serious erosive wear, also atmosphere are produced and pollute.Inquire into people and to improve aspect balanced transversal oxygen concentration and charcoal be evenly distributed.Broadcasting coal secondary wind is one of effective means, but this has only improved the gas-solid mixed combustion in the bed internal zone dividing territory; Improving aspect the kinetic characteristic of Dual-Phrase Distribution of Gas olid, for example " surface bed " of Britain proposed both at home and abroad, resulting structure measure such as domestic " V " type cloth wind system and " pot type bed ", Chinese patent CN85100098B(1987 particularly, 11, the authorization bulletin) 25. " fluidized bed boiler with strong inverse flow in bed ", below a kind of zone of causing backflow at needs is provided the one-sided perforate blast cap that one to three row is higher than other blast cap is set, and the blast cap height raises from inside to outside gradually, the same structure of revetment dorsad of perforate, thereby form a kind of directed horizontal wind distributing face that blows of regional area, but its invention task just solves near coal supply point, produce stable strong inverse flow motion near near heating surface that returns the grey point and need to protect and the furnace wall, so that fine grained sufficient reacting, heating surface and furnace wall wearing and tearing alleviate, do not solve strong inverse flow motion whole in the fluid bed, moreover its directed horizontal blowing cap and even distributing wind blast cap place on the same defeated wind air compartment, the laterally difficult control of the air quantity of cloth wind and blast, the outer circulating effect that falls of liter in only having improved in the local bed, and deficiency is still disliked in whole circulation.
At the prior art above shortcomings, task of the present utility model is for strengthening crossflow whole in the fluid bed, further strengthening gas-solid transverse convection, disturbance and mixing.Strengthen whole circulating effect, and design a kind of directed horizontal back-shaped air-distribution device that blows wind distributing face that around the even distributing wind face, is provided with.
The back-shaped air-distribution device that circulates in the reinforcement fluid bed that constitutes by even lateral flow type distribution grid, directed transverse-blow type distribution grid and air compartment etc., characteristics are around the directed transverse-blow type distribution grid of perimembranous is set around the even lateral flow type distribution grid of central authorities, the directed transverse-blow type distribution grid of perimembranous is high outside and low outsidely to tilt to install to central authorities, and central distribution plate and circumferential portion fabric swatch are to be configured in respectively on the independent air compartment; The directed transverse-blow type distribution grid of perimembranous can be made of the blast cap of the contour or not contour directed air vent of configuration on porous plate, also can be made of the directed air distribution plate of combination.
Describe in detail below in conjunction with accompanying drawing.
Fig. 1 is the utility model schematic perspective view.
Fig. 2 is evenly lateral flow type distribution grid cross section signals of central authorities.
Fig. 3 is the circumferential portion fabric swatch cross section signal with directed air vent blast cap.
Fig. 4 is the circumferential portion fabric swatch cross section signal that the directed air distribution plate of combination constitutes.
The back-shaped air-distribution device of strengthening circulation in the fluid bed is arranged on the below of fluid bed, and fluidized-bed combustion boiler is provided in a side of the bottom, combustion chamber.Mainly constitute by the even lateral flow type distribution grid 1 of central authorities with around the directed transverse-blow type distribution grid 2 of the perimembranous that is provided with around its etc.Central distribution plate 1 is made up of the lateral flow type blast cap (latasuture formula or side-hole-type) 4 of the multidirectional ventilation of porous plate 3 and routine, thereby forms the even distributing wind face of central authorities.Circumferential portion fabric swatch 2 can blow wind distributing face 2 ' constitute by ventilation blast cap contour or not contour directed side opening 5 combinations that are provided with directed horizontal on porous plate 3, be provided with not that the purpose of the blast cap 5 of contour directed side opening is formation multi-level beam wind or enhancing low layer beam wind, blow wind distributing face 2 ' deposited particles; Also can adopt the directed air distribution plate 2 of Chinese patent combined type of Jiangxi Boiler Factory application " constitute; its structural feature be plate 3 ' on have the combination that is made into integration with it to distribute several projections 6; and on projection 6, have the directed angling hole 7 that ventilates; this projection 6 can be waveform projection or ball projection, and angling hole 7 can have aperture consistent or that change.Circumferential portion fabric swatch 2 is high outside and low outsidely tilt to install to central authorities, and the directed air vent on it is all towards central authorities, thus around forming to the directed wind distributing face of central authorities.And central distribution plate 1 and circumferential portion fabric swatch 2 are configured in respectively separately independently on the air compartment 8,9, and air compartment 8,9 has independently defeated separately wind system air inlet 10,11 and damper 12, air inlet 10,11 visual boiler capacities and be provided with one or more.After the suitable blower fan air blast of adapted, make the blast of air compartment 9, air quantity all is higher than air compartment 8, the percent opening (routine 2.5-3%) of adding on the circumferential portion fabric swatch 2 also is higher than central distribution plate 1, so the directed horizontal blowing of distribution grid 2 has big air quantity and flow velocity, not only can directly cool off the appearance portion of adjacent blast cap 5 or projection 6, the more important thing is by the horizontal blowing of orientation moves fluid bed endoparticle center position in bed, again under the comprehensive function of the peripheral ascending air of central distribution plate 1, produced the particle rise effect at peripheral place, particle part after the rising falls after rise to wall place, burner hearth limit, and the partial circulating effect falls outward in the interior liter that forms wall place, surrounding; Another part particle falls to distribution grid 1 center.Because under the composite factor effects such as particle deadweight, central updraught and vacuum suction, formed the middle part in fall and rise the systemic circulation effect outward, under the cross lamination of these circulation tracks, the transverse convection in the bed, gas-solid mixing are more remarkable.Prolonged the time of staying of fine grained in bed, efficiency of combustion is more improved.Test shows that the tilt angle alpha of circumferential portion fabric swatch 2 is the most suitable with 2-12 °.
With prior art, especially with have partial lateral wind distributing face boiler furnace and compare, the utility model produces under the comprehensive function of the even updraught of central authorities and the directed horizontal blowing of perimembranous at distribution grid 1,2, produced the partial circulating effect at systemic circulation effect and surrounding wall place at the middle part of fluid bed, an interior whole gas-solid transverse convection, disturbance and mixing are strengthened, prolong the bed particle Residence Time, improved the efficiency of combustion of fuel and the desulphurizing ability of lime stone; Because bed inner bottom part oxygen concentration height, the fuel particle sufficient combustion is on bed surface Bubble is less, and the particle amount of launching is also little, has reduced the erosive wear of relevant heated element and furnace wall; It is rational in infrastructure, operation control is convenient, and it is wide to be suitable for fuel range, and the load variations strong adaptability is regulated than reaching 4:1; Obvious, this back-shaped air-distribution device also goes for needing to strengthen other industrial occasions of circulation in the fluid bed.
Claims (3)
1, strengthens the back-shaped air-distribution device of circulation in the fluid bed.By directed transverse-blow type distribution grid of even lateral flow type distribution grid and air compartment, constitute.It is characterized in that around the directed transverse-blow type distribution grid 2 of perimembranous is set around the even lateral flow type distribution grid 1 of central authorities, the directed transverse-blow type distribution grid 2 of perimembranous is high outside and low outside to central authorities' inclination installation, its directed air vent is all towards central authorities, and central distribution plate 1 and circumferential portion fabric swatch 2 are to be configured in respectively on the independent air compartment 8,9.
2, back-shaped air-distribution device according to claim 1 is characterized in that the directed transverse-blow type distribution grid 2 of perimembranous can be made of the blast cap 5 of the contour or not contour directed air vent of configuration on porous plate 3.Also can by plate 3 ' on have the combination that is made into integration with it to distribute several projections 6, the directed air distribution plate 2 of combined type that has the directional inclination hole 7 of ventilation on the projection 6 " constitutes.
3,, it is characterized in that the tilt angle alpha of the directed transverse-blow type distribution grid 2 of perimembranous is 2-12 ° according to claim 1 and 2 described back-shaped air-distribution devices.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90225649 CN2080421U (en) | 1990-12-03 | 1990-12-03 | Circular air-distributing device for strengthening internal cycle in fluidized bed |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90225649 CN2080421U (en) | 1990-12-03 | 1990-12-03 | Circular air-distributing device for strengthening internal cycle in fluidized bed |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2080421U true CN2080421U (en) | 1991-07-10 |
Family
ID=4903050
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 90225649 Withdrawn CN2080421U (en) | 1990-12-03 | 1990-12-03 | Circular air-distributing device for strengthening internal cycle in fluidized bed |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2080421U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110935401A (en) * | 2019-11-04 | 2020-03-31 | 刘榕副 | Converging fluidized bed |
-
1990
- 1990-12-03 CN CN 90225649 patent/CN2080421U/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110935401A (en) * | 2019-11-04 | 2020-03-31 | 刘榕副 | Converging fluidized bed |
| CN110935401B (en) * | 2019-11-04 | 2022-05-27 | 佛山市大千环保科技有限公司 | Converging fluidized bed |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C15 | Extension of patent right duration from 15 to 20 years for appl. with date before 31.12.1992 and still valid on 11.12.2001 (patent law change 1993) | ||
| RN01 | Renewal of patent term | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |