CN102384470A - Primary air inlet device of circulating fluidized bed boiler - Google Patents
Primary air inlet device of circulating fluidized bed boiler Download PDFInfo
- Publication number
- CN102384470A CN102384470A CN2010102727582A CN201010272758A CN102384470A CN 102384470 A CN102384470 A CN 102384470A CN 2010102727582 A CN2010102727582 A CN 2010102727582A CN 201010272758 A CN201010272758 A CN 201010272758A CN 102384470 A CN102384470 A CN 102384470A
- Authority
- CN
- China
- Prior art keywords
- air
- air intake
- wind
- primary air
- distribution plate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
Abstract
The invention discloses a primary air inlet device of a circulating fluidized bed boiler, which comprises an air distribution plate, a hood 4, a primary air chamber 3, a primary air inlet pipeline 1 and a horn-shaped pipeline 2, wherein the air distribution plate and the hood 4 are arranged at the bottom of a boiler cavity of the circulating fluidized bed boiler, and the primary air chamber 3 and the primary air inlet pipeline 1 are arranged under the air distribution plate. The big end of the horn-shaped pipeline is connected with the primary air chamber, and the small end of the horn-shaped pipeline is connected with the primary air inlet pipeline. Primary air is distributed evenly on a plane of the whole air distribution plate, thereby preventing the hood from being blocked and resolving the problems of slag leakage at the bottom of the boiler, insufficient combustion, poor fluidization effect and the like.
Description
Technical field
The present invention relates to wind air intake equipment of CFBB.
Background technology
One, CFBB introduction
The CFBB technology is a kind of comparatively ripe clean burning technology; Compare with conventional combustion system; CFBB has that fuel is applied widely, desulfuration in furnace efficient is high, the NOX discharge capacity is little, efficiency of combustion is high, load regulation rate reaches advantages such as lime-ash can fully utilize greatly; The CFBB technology is simple relatively with technological process simultaneously; Investment and operating cost are also relatively low, so the CFBB technology is just being developed in worldwide and application widely rapidly.
The course of work of CFBB is following: fuel (coal) and desulfurizing agent (lime stone) are after being crushed to suitable particle size; Feed from the appropriate location, combustion chamber by feeder and lime stone batcher; Mixing of materials with red-hot boiling in the combustion chamber; And rapid fire burns, under the effect of higher air velocity, burning is full of whole burner hearth and violent blending simultaneously.A large amount of solid particles are along with flue gas is carried out the combustion chamber; Enter into cyclone separator; Wherein bigger solid particle is sent back to the combustion chamber once more via cyclone separator bottom and feeding back device and is continued to participate in burning, and the high-temperature flue gas of carrying trickle grit secretly of discharging by cyclone separator, then after back-end ductwork and convection heating surface heat exchange; Remove dust particle by deduster, clean flue gas is discharged by chimney again.
Two, a wind introduction of CFBB
The important component part that wind of CFBB is the CFBB air and gas system.Wind of CFBB is single-phase air-flow, and it mainly acts on is that bed expects and send into certain oxygen amount for the lower furnace portion emulsion zone to supply fuel combustion in the fluidisation stove.
Wind of CFBB is provided by primary air fan; Through entering into air compartment of burner hearth bottom after the air preheater heating; Get into burner hearth via air distribution plate and blast cap again; Make the interior bed of burner hearth expect violent Boiling Combustion under this action of high-speed airflow, and the realization bed is expected the fluidisation circulation between burner hearth and cyclone separator.Therefore, the air distribution of a wind of CFBB is even, the particularly even distribution of wind on the air distribution plate plane, and burning and fluid effect that bed in the burner hearth is expected play crucial effects.
The layout of a wind of existing CFBB generally has following several kinds of forms:
1, the female pipe of wind single-sided arrangement successively gets into air compartment one time with the form of two arms.As shown in Figure 1, sequence number 11 is the female pipe of wind of CFBB, and sequence number 12 is a wind arm with sequence number 13, and sequence number 14 is an air compartment, and sequence number 15 is air distribution plate and blast cap.The heat primary air that comes out from air preheater is delivered to furnace bottom area by the female pipe 11 of wind, successively enters into air compartment 14 one time from a wind arm 12,13 then, gets into burner hearth through air distribution plate and blast cap 15 again after in an air compartment 14, spreading.
The shortcoming of this arrangement form is:
At first, because the female pipe of a wind diameter is less relatively, two air intake arm diameters are identical, cause the air quantity of far-end air intake arm 13 big, and the air quantity of near-end air intake arm 12 is little, thereby causes air quantity at the furnace chamber width skewness.
Secondly, for guaranteeing that static pressure is even in the air compartment, often air compartment 14 back-plane design are become along the inclined-plane of furnace depth direction to be evenly distributed along the furnace depth direction with the assurance air-flow.But, since base plate next-door neighbour air inlet, the actual deflector that becomes depth direction, and the blast cap flow near the burner hearth front wall is obviously higher to making, so cause air quantity also inhomogeneous in the distribution of furnace depth direction.
The 3rd; Because air compartment 14 width are bigger, and the diameter of two air intake arms 12,13 is less relatively, so cause that air-flow distributes too concentrated in air compartment; Promptly the regional gas stream amount near the air intake arm is big in air compartment; Flow velocity is fast, and little in the regional gas stream amount away from the air intake arm, flow velocity is low.
2, the female pipe of wind symmetric arrangement gets into air compartment one time simultaneously with the form of four arms.As shown in Figure 2, the female pipe of wind is symmetrical in the boiler center line and arranges that heat primary air enters into air compartment 25 one time simultaneously through four arms of female Guan Houcong 21,22,23,24, gets into burner hearth through air distribution plate and blast cap 26 again after the diffusion.
This arrangement form is because each air intake arm flow velocity is identical, and the multitube air intake alleviated the problem that air-flow is too concentrated, thus this arrangement form air quantity the distribution situation of furnace chamber width on a kind of arrangement form obtained bigger improvement.But air quantity still exists in the problem of non-uniform of furnace depth direction.
3, by two arms respectively from an air compartment left and right sides air intake.As shown in Figure 3, heat primary air respectively by two air intake arms 31,32 from air compartment 33 left and right sides air intake simultaneously, in air compartment 33, get into burner hearths through air distribution plate and blast cap 34 again after the diffusion.
This arrangement form then can form jet when the outlet wind speed of air intake arm is higher, make air-flow be difficult for diffusion, and is on the low side in the outlet overdraught speed near an air compartment left and right sides; And when the outlet wind speed of air intake arm was on the low side, because an air compartment width is bigger, then air-flow was difficult for arriving the air compartment middle part, and air velocity is with on the low side in the outlet of air compartment central region.Therefore this arrangement form is poor for applicability, is difficult to reach the purpose that air-flow is distributed in the air distribution plate uniform plane.
Summary of the invention
The technical problem that the present invention will solve provides and a kind of a wind is evenly distributed on whole air distribution plate plane, has prevented wind air intake equipment of CFBB that blast cap stops up.
In order to solve the problems of the technologies described above; Technical scheme of the present invention is: comprising: the air distribution plate and the blast cap 4 that are arranged in recirculating fluidized bed burner hearth bottom; Be arranged in an air compartment 3 and primary air intake pipe road 1 of the below of air distribution plate; Also comprise a diverging duct 2, the big end of said diverging duct is connected with an air compartment, and the small end of diverging duct is connected with the primary air intake pipe road.
Further, said diverging duct is arranged on the air compartment below one time, and the big end of diverging duct is rectangle or square, and small end is circular, greatly rounding off between end and the small end.
Said primary air intake pipe road has more than two, and diverging duct quantity is identical with primary air intake pipe road quantity, and said diverging duct arranges that along an air compartment width said primary air intake pipe converges into the female pipe of wind air intake one time along the opposite direction of air intake direction.
The center line of said diverging duct is vertical with air distribution plate.
The invention has the beneficial effects as follows: one time wind is evenly distributed on whole air distribution plate plane, has prevented the blast cap obstruction, has solved slag breakthrough, and it is insufficient to burn, problems such as fluid effect difference.
Description of drawings
Below in conjunction with the accompanying drawing and the specific embodiment the present invention is done further detailed explanation.
The female pipe of wind of Fig. 1 single-sided arrangement sketch map.
The female pipe of wind of Fig. 2 symmetric arrangement sketch map.
Two arms of Fig. 3 are respectively from an air compartment left and right sides air intake sketch map.
Fig. 4 is a wind air intake of an a kind of novel CFBB mode front view.
Fig. 5 is a wind air intake of an a kind of novel CFBB mode vertical view.
Fig. 6 is a wind air intake of an a kind of novel CFBB mode A-A view.
Fig. 7 is a wind air intake of an a kind of novel CFBB mode B-B view.
The specific embodiment
Description of reference numerals is following:
Primary air intake pipe road 1, diverging duct 2, air compartments 3, air distribution plate and blast cap 4
Below in conjunction with accompanying drawing the present invention is done further detailed explanation.
A wind air intake of novel CFBB of the present invention mode
In order to solve the problem that prior art exists; Make wind of CFBB on the air distribution plate plane, be evenly distributed; Thereby obtain good burning and fluid effect; Avoid because of one time that the wind skewness causes problems such as blast cap obstruction, slag breakthrough, propose a wind air intake of a kind of novel CFBB mode at present.
As shown in Figure 4, sequence number 1 is CFBB primary air intake pipe road, and sequence number 2 is a diverging duct, and sequence number 3 is an air compartment, and sequence number 4 is air distribution plate and blast cap.
Air distribution plate and blast cap 4 are arranged in boiler hearth of circulating fluidized bed bottom, air compartment 3 be arranged in air distribution plate and blast cap 4 under, in the bottom of an air compartment 3, arrange a plurality of diverging ducts 2 along air compartment 3 widths.One end of diverging duct 2 larger cross-sections is connected with an air compartment 3 respectively, and an end of diverging duct 2 small cross sections then is connected with primary air intake pipe road 1 respectively.
In the boiler running process; One time wind gets into the heat primary air house steward through air preheater heating back; By a plurality of primary air intake pipes road 1 wind is delivered to the burner hearth bottom zone respectively then; Diverging duct 2 via vertical placement enters into air compartment 3 from lower to upper one time then, gets into burner hearth through air distribution plate and blast cap 4 then and participates in burning and fluidized bed material.
The advantage of this air intake mode is: one time wind is evenly distributed on whole air distribution plate plane, has prevented blast cap obstruction, slag breakthrough, and it is insufficient to burn, problems such as fluid effect difference.As previously mentioned, a traditional wind air intake mode is often taked from the method for an air compartment side level introducing.Through analyzing, this mode of introducing from air compartment side level is difficult to realize the even distribution on the air distribution plate plane of wind, and reason is summed up as follows:
At first, one time the air compartment width is bigger, and that each air intake props up tube section is less relatively, and the problem that air-flow is concentrated is difficult to solve, thereby causes a wind along the furnace chamber width skewness.
Secondly; Level gets into a wind from the air compartment side; Needing in an air compartment, to turn could get into burner hearth behind 90 degree because the height of an air compartment is limited, after the air-flow turning often horse back get into burner hearth through air distribution plate and blast cap; Lack enough straight section and can be used in rectification, therefore cause a wind also inhomogeneous along the distribution of furnace depth direction.
In view of wind from the air compartment side level introduce the shortcoming of mode, the mode that the present invention takes wind to introduce from the air compartment bottom vertical.Diverging duct 2 is vertically placed; The one of which end connects primary air intake pipe road 1, and the other end connects the bottom of an air compartment 3, and one time wind gets into diverging duct 2 by intake stack 1; After diverging duct 2 diffusions, can all enter into air compartment 3 more uniformly one time in furnace width and depth direction; And an air compartment 3 is a straight length, is equivalent to one section voltage stabilizing commutating zone, thereby air-flow is through can very be distributed on the air distribution plate plane after the air compartment 3 uniformly.
Claims (4)
1. wind air intake equipment of CFBB; Comprise: the air distribution plate and the blast cap (4) that are arranged in recirculating fluidized bed burner hearth bottom; Be arranged in an air compartment (3) and primary air intake pipe road (1) of the below of air distribution plate; It is characterized in that: also comprise a diverging duct (2), the big end of said diverging duct is connected with an air compartment, and the small end of diverging duct is connected with the primary air intake pipe road.
2. wind air intake equipment of CFBB according to claim 1; It is characterized in that: said diverging duct is arranged on the air compartment below one time; The big end of diverging duct is rectangle or square, and small end is circular, greatly rounding off between end and the small end.
3. wind air intake equipment of CFBB according to claim 2; It is characterized in that: said primary air intake pipe road has more than two; Diverging duct quantity is identical with primary air intake pipe road quantity; Said diverging duct arranges that along an air compartment width said primary air intake pipe converges into the female pipe of wind air intake one time along the opposite direction of air intake direction.
4. wind air intake equipment of CFBB according to claim 2, it is characterized in that: the center line of said diverging duct is vertical with air distribution plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102727582A CN102384470A (en) | 2010-09-06 | 2010-09-06 | Primary air inlet device of circulating fluidized bed boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102727582A CN102384470A (en) | 2010-09-06 | 2010-09-06 | Primary air inlet device of circulating fluidized bed boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102384470A true CN102384470A (en) | 2012-03-21 |
Family
ID=45824136
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010102727582A Pending CN102384470A (en) | 2010-09-06 | 2010-09-06 | Primary air inlet device of circulating fluidized bed boiler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102384470A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104566353A (en) * | 2014-12-20 | 2015-04-29 | 无锡东马锅炉有限公司 | Primary air blowing device for circulating fluidized bed boiler |
| CN106122953A (en) * | 2016-08-29 | 2016-11-16 | 江苏汇能锅炉有限公司 | A kind of First air air-distribution device of CFBB |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5938513A (en) * | 1982-08-26 | 1984-03-02 | ゲブリユ−ダ−・ズルツア−・アクチエンゲゼルシヤフト | Base section of combustion chamber for igniting fluidized bed |
| JPH07269833A (en) * | 1994-03-31 | 1995-10-20 | Hitachi Zosen Corp | Fluidized bed incineration furnace and its combustion control method |
| US5879638A (en) * | 1995-10-16 | 1999-03-09 | Dorr-Oliver Incorporated | Fluidized bed reactor with gas distributor |
| EP1226388B1 (en) * | 1999-10-29 | 2005-02-23 | Kvaerner Power Oy | Grate for fluidized bed boiler |
| CN101037606A (en) * | 2007-04-24 | 2007-09-19 | 济南钢铁股份有限公司 | Technique process for coal flow fractionation and moisture adjustment |
| CN101537330A (en) * | 2009-03-16 | 2009-09-23 | 浙江大学 | Airflow uniform distribution device of circulating fluidized bed |
| CN101571288A (en) * | 2009-06-19 | 2009-11-04 | 北京乡电电力有限公司 | Swirl air-distribution device of biomass fluidized bed |
-
2010
- 2010-09-06 CN CN2010102727582A patent/CN102384470A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5938513A (en) * | 1982-08-26 | 1984-03-02 | ゲブリユ−ダ−・ズルツア−・アクチエンゲゼルシヤフト | Base section of combustion chamber for igniting fluidized bed |
| JPH07269833A (en) * | 1994-03-31 | 1995-10-20 | Hitachi Zosen Corp | Fluidized bed incineration furnace and its combustion control method |
| US5879638A (en) * | 1995-10-16 | 1999-03-09 | Dorr-Oliver Incorporated | Fluidized bed reactor with gas distributor |
| EP1226388B1 (en) * | 1999-10-29 | 2005-02-23 | Kvaerner Power Oy | Grate for fluidized bed boiler |
| CN101037606A (en) * | 2007-04-24 | 2007-09-19 | 济南钢铁股份有限公司 | Technique process for coal flow fractionation and moisture adjustment |
| CN101537330A (en) * | 2009-03-16 | 2009-09-23 | 浙江大学 | Airflow uniform distribution device of circulating fluidized bed |
| CN101571288A (en) * | 2009-06-19 | 2009-11-04 | 北京乡电电力有限公司 | Swirl air-distribution device of biomass fluidized bed |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104566353A (en) * | 2014-12-20 | 2015-04-29 | 无锡东马锅炉有限公司 | Primary air blowing device for circulating fluidized bed boiler |
| CN106122953A (en) * | 2016-08-29 | 2016-11-16 | 江苏汇能锅炉有限公司 | A kind of First air air-distribution device of CFBB |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1104589C (en) | Pulverized solid fuel nozzle tip | |
| CN103216821B (en) | Multi-stage stratified combustion system and method for primary air and secondary air of boiler | |
| WO2017206430A1 (en) | Circulating fluidized bed combustion system with uniform air distribution device | |
| CN103748429B (en) | For heat treated equipment and the method for bulk or coacervation material | |
| CN1331788A (en) | Method of operating tangential firing system | |
| CN105864748A (en) | Combined combustion system of chain boiler | |
| CN105805730B (en) | Realize the circulating fluidized bed boiler systems of low-nitrogen oxide discharging | |
| TWI725736B (en) | Combustible waste blowing device and operation method thereof | |
| CN108954298A (en) | A kind of circulating fluidized bed boiler low nitrogen burning exhaust system and its remodeling method | |
| CN201387005Y (en) | Dust-removing fluidized-bed furnace | |
| CN104748147B (en) | The combustion method of wall face-fired boiler | |
| CN104696951B (en) | Boiler-in integrated coupled desulfurization and denitrification method for circulating fluidized bed boiler | |
| CN102384470A (en) | Primary air inlet device of circulating fluidized bed boiler | |
| CN103697467B (en) | Method for coal slime combustion of circulating fluidized bed boiler | |
| CN107084387A (en) | The low NOx Horizontal CFB Boilers of multipaths that a kind of flue gas strile-backs | |
| TW201541045A (en) | Flux calciner | |
| CN206919000U (en) | A kind of differential fluidized-bed boiler system | |
| CN105927972A (en) | Wind distribution device facilitating discharging of big particle matter and multi-flow circulating fluidized bed boiler | |
| CN103075728A (en) | Flow-reconstruction based circulating fluidized bed boiler for controlling nitric oxide | |
| CN106287687A (en) | A kind of burner flue gas recirculation boiler structure | |
| CN102095254B (en) | Organic heat carrier boiler of fluidized bed, with low cost, environment protection, energy saving and emission reduction | |
| KR20160095417A (en) | Cyclone dust collector for boiler and Pellet boiler equipment using it | |
| CN202328292U (en) | Ash handling equipment for secondary air bellow of coal-fired boiler and coal-fired boiler | |
| CN205316299U (en) | Recoverable hot -blast furnace of flue gas | |
| CN210624504U (en) | Combined grate environment-friendly industrial boiler for biomass direct-combustion and partition-classification split-phase combustion |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20120321 |