CN103148501A - Secondary air structure for boiler burning biomass formed fuel - Google Patents
Secondary air structure for boiler burning biomass formed fuel Download PDFInfo
- Publication number
- CN103148501A CN103148501A CN201310080743XA CN201310080743A CN103148501A CN 103148501 A CN103148501 A CN 103148501A CN 201310080743X A CN201310080743X A CN 201310080743XA CN 201310080743 A CN201310080743 A CN 201310080743A CN 103148501 A CN103148501 A CN 103148501A
- Authority
- CN
- China
- Prior art keywords
- nozzle
- secondary air
- burning
- air
- fuel
- 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.)
- Granted
Links
Images
Landscapes
- Air Supply (AREA)
Abstract
The invention relates to a secondary air structure for a boiler burning biomass formed fuel. The secondary air structure is characterized in that a transverse air box is arranged in a boiler wall of a front boiler wall; a secondary air port is communicated with the air box; and more than two nozzles communicated with a hearth are arranged on the air box. With the adoption of spiral air ducts in the nozzles, secondary air is rotationally injected into the hearth to participate in boiler burning, so that the problem of carbon precipitation due to oxygen deficit, low temperature and insufficient burning of volatiles at an initial burning stage of biomass can be solved. With the adoption of the structure, the high-volatile biomass formed fuel can catch fire and be burnt in advance, the air required for the fuel burning is supplemented sufficiently as early as possible, the temperature of a volatile burning section is raised, the intensive mixing and burning of the volatiles released after the fuel is heated with the air are enhanced, the combustion efficiency of the fuel is as high as above 98%, smoke prevention and dust control performances are good, discharge of harmful gas and dust is low, the problem of black smoke caused by the carbon precipitation easily generated during the ignition and burning of the biomass formed fuel can be solved, and environmental benefits are significant.
Description
Technical field
The present invention relates to boiler, relate in particular to the Secondary Air structure of biomass burning shaped fuel boiler, be applicable to be installed in traveling-grate stoker and the fixed grate boiler of biomass shaping fuel-combustion.
Background technology
Biological substance for combustion shaped fuel boiler because the biomass molding fuel volatile matter is high, needs large quantity of air and strong mixing during ignition, need that again sufficiently high temperature is arranged simultaneously, could completing combustion.Through having looked into ZL200810049852.4 " high-temperature combustion-supporting device and special combustion device for inverse combustion type biomass fuel ", its Secondary Air mechanism is perpendicular to the furnace wall, and wind direction is fixed, and causes fuel to mix inhomogeneous with Secondary Air and affects efficiency of combustion, and produce black smoke.
Summary of the invention
The object of the invention is to overcome the shortcoming that exists in the Secondary Air structure of above-mentioned biological substance for combustion shaped fuel boiler, a kind of Secondary Air structure that can effectively promote the efficiency of combustion of biomass molding fuel and eliminate the biomass burning shaped fuel boiler of black smoke is provided.
Technical solution of the present invention is achieved in that a kind of Secondary Air structure of biomass burning shaped fuel boiler, its main points are provided with horizontal bellows in being in the furnace wall of boiler front wall, overfiren air port communicates with bellows, is provided with the nozzle that communicates with burner hearth more than two on bellows.
The Secondary Air structure of a plurality of nozzles makes Secondary Air more even, and fuel mixes more even with Secondary Air, is conducive to improve efficiency of combustion and eliminates black smoke.
The present invention also can be further designed to nozzle and be made of with top nozzle swirl vane, nozzle covering ring plate nozzle housing, nozzle eddy flow core pipe, two, nozzle housing is hollow pipe, nozzle eddy flow core pipe is the pipe of upper end closed, nozzle covering ring plate is fixed on the port of export of nozzle, it is the air outlet of nozzle that there is through hole the centre, the lower end of nozzle swirl vane is fixed on nozzle covering ring plate, one side fixed nozzle outer casing inner wall, the top of another side and nozzle eddy flow core pipe join, connecting length be nozzle eddy flow core pipe overall length 1/3rd to 1/2nd between.
Have 8 spiral nozzle swirl vanes tangentially to be fixed between nozzle housing and nozzle eddy flow core pipe, the diameter of nozzle eddy flow core pipe be the nozzle housing internal diameter 1/3rd to 1/2nd between.
the operation principle of nozzle: after Secondary Air enters nozzle housing, arrival nozzle eddy flow core pipe upper end, because the existence of nozzle eddy flow core pipe diminishes gas channel, air-flow passes through the circular passage that shell and eddy flow core pipe consist of vertically, airflow direction is constant, flow velocity increases to 1.2 times to 1.4 times of former flow velocity, produce the disturbance of local air flow, through after the rectification and current stabilization of leading portion, the air-flow of speedup enters the nozzle swirl vane of arranged tangential, structural change gas direction by the nozzle swirl vane, make it to produce rotation, stopping due to nozzle covering ring plate while, air-flow change flow direction is the passage that radially forms along 8 nozzle swirl vanes and collects to nozzle eddy flow core tube hub, collect in process due to channel narrows, the airflow area reduces, air-flow velocity continues to bring up to original 2 times to 3 times, form simultaneously the High Rotation Speed air-flow.After entering nozzle eddy flow core tube hub, form the axial air flow of High Rotation Speed, the axial flow scooter enters 4 times to 9 times of nozzle initial flow rate, sprays into burner hearth from nozzle eddy flow core pipe angled (being generally 8 °) with certain speed (greater than 20m/s) axial-rotation under certain blast.
By the design of nozzle interior spiral duct, make Secondary Air rotation spray into burner hearth and participate in boiler combustion, can solve biomass combustion initial stage anoxic, temperature is on the low side, the insufficient problem of analysing carbon that causes of fugitive constituent burning.
The place ahead of each nozzle in bellows is fixed with equal wind dividing plate, and all the length of wind dividing plate is arranged from overfiren air port from high to low.
The nearest dividing plate of airduct import department is the longest, the farthest for the shortest.This layout can make the pressure balance before each nozzle, reaches the purpose of the balanced air distribution of each nozzle.
Nozzle is tilted to down, and the angle that becomes with horizontal line is 5-15 °.Angle is too high, and the high temperature effect of entrainmenting weakens, and it is poor that disturbance mixes; Angle is too low, easily the fuel on fire grate is blown away, and burning is interrupted, and causes after the fuel Volatile remaining coke to rest on fire grate and burns, and the flying dust amount increases, and unburned carbon loss increases, and efficiency of combustion reduces on the contrary.
Usually select: nozzle is tilted to down, and the angle that becomes with horizontal line is 8 °.
The present invention can make the biomass molding fuel of high volatile shift to an earlier date ignition, the needed air of capacity postcombustion burning as early as possible, improve the temperature of volatile combustion section, strengthen the rear volatile matter that discharges of fuel heating and the strong mixing and burning of air, fuel economy is high, can reach more than 98%, and the smoke abatement and dust control performance is good, pernicious gas and dust emissions are low, and can overcome the black smoke problem that carbon causes of analysing that easily produces in biomass molding fuel ignition process simultaneously, environmental benefit is remarkable.
Description of drawings
Fig. 1 is the Secondary Air structural front view of biological substance for combustion shaped fuel boiler
Fig. 2 is that the top view of Fig. 1 is rotated counterclockwise 90 °
Fig. 3 is the structure chart of nozzle
Fig. 4 is the left view of Fig. 3
1 furnace wall 2 bellows 3 nozzle 31 nozzle housing 32 nozzle eddy flow core pipe 33 nozzle swirl vane 34 nozzle covering ring plate 341 equal wind dividing plate 5 secondary air intake pipes of through hole 4.
The specific embodiment
The present invention is further detailed explanation below in conjunction with accompanying drawing, can make the professional and technical personnel more understand the present invention, and following embodiment is modified, and it is all possible adding and replacing, and does not all exceed protection scope of the present invention.
as Fig. 1, 2, 3, shown in 4, a kind of Secondary Air structure of biomass burning shaped fuel boiler, 2 tons of steam/hour boiler, the width of boiler front wall is 2 meters, be provided with horizontal bellows 2 in the furnace wall 1 of boiler front wall is interior, overfiren air port 5 communicates with bellows 2, five nozzles that communicate with burner hearth 3 evenly are set on bellows 2, the place ahead of each nozzle 3 in bellows 2 is fixed with equal wind dividing plate 4, all the length of wind dividing plate 4 is arranged from overfiren air port 5 from high to low, the difference in height of the length of dividing plate is identical, the number such as be poor, the longest according to the dividing plate that airduct import department is nearest, the farthest for the shortest, this layout can make the pressure balance before each nozzle, reach the purpose of the balanced air distribution of each nozzle.it is identical with boiler combustion fire grate width that bellows 2 are imbedded in the interior concrete width of boiler front wall, nozzle 3 is by nozzle housing 31, nozzle eddy flow core pipe 32, two with top nozzle swirl vane 33, nozzle covering ring plate 34 consists of, nozzle housing 31 is hollow pipe, internal diameter is 25-40mm, use the high temperature resistant stainless steel material to make, nozzle eddy flow core pipe 32 is the pipe of upper end closed, nozzle covering ring plate 34 is fixed on the port of export of nozzle, the centre has through hole 341 to be the air outlet of nozzle, diameter is 15-25mm, the lower end of nozzle swirl vane 33 is fixed on nozzle covering ring plate 34, one side fixed nozzle shell 31 inwalls, the top of another side and nozzle eddy flow core pipe 32 join, connecting length be nozzle eddy flow core pipe 32 overall lengths 1/3rd to 1/2nd between.Have 8 spiral nozzle swirl vanes 33 tangentially to be fixed between nozzle housing 31 and nozzle eddy flow core pipe 32 in figure, the diameter of nozzle eddy flow core pipe 32 be nozzle housing 31 internal diameters 1/3rd to 1/2nd between.Nozzle 3 is tilted to down, and the angle that becomes with horizontal line is 5-15 °, is preferably 8 °, and angle is too high, and the high temperature effect of entrainmenting weakens, and it is poor that disturbance mixes; Angle is too low, easily the fuel on fire grate is blown away, make burning interrupt (also referred to as a wind short circuit), causing after the fuel Volatile remaining coke to rest on fire grate burns, the flying dust amount increases, unburned carbon loss increases, and efficiency of combustion reduces on the contrary, and it is same as the prior art that all the other do not state part.
operation principle of the present invention is: after Secondary Air enters bellows, distribute through the even action of equal wind dividing plate and enter nozzle, after Secondary Air enters nozzle housing 31, arrival nozzle eddy flow core pipe 32 upper ends, because the existence of nozzle eddy flow core pipe diminishes gas channel, air-flow passes through the circular passage that shell and eddy flow core pipe consist of vertically, airflow direction is constant, flow velocity increases to 1.2 times to 1.4 times of former flow velocity, produce the disturbance of local air flow, through after the rectification and current stabilization of leading portion, the air-flow of speedup enters the nozzle swirl vane 33 of arranged tangential, structural change gas direction by the nozzle swirl vane, make it to produce rotation, stopping due to nozzle covering ring plate 34 while, air-flow changes flow direction and is radially the passage that forms along 8 nozzle swirl vanes 33 and collects to nozzle eddy flow core pipe 32 centers and (see Fig. 3, 4), collect in process due to channel narrows, the airflow area reduces, air-flow velocity continues to bring up to original 2 times to 3 times, form simultaneously the High Rotation Speed air-flow.After entering nozzle eddy flow core pipe 32 centers, form the axial air flow of High Rotation Speed, the axial flow scooter enters 4 times to 9 times of nozzle initial flow rate, sprays into burner hearth from nozzle eddy flow core pipe 32 angled (being preferably 8 °) with certain speed (greater than 20m/s) axial-rotation under certain blast.Enter after burner hearth by strongly the entrainmenting of high velocity air, disturbance, add the negative pressure eddy current that forms between two nozzles, can make the volatile matter that the fuel combustion initial stage separates out mix with air and burn rapidly, and the high-temperature flue gas in burner hearth is entrainmented, the high temperature that keeps the fuel fire initial stage, volatile matter has little time to analyse carbon and has just burnt fully, thereby reaches the purpose of smoke abatement and dust control.
Claims (7)
1. the Secondary Air structure of a biomass burning shaped fuel boiler, it is characterized in that, be provided with horizontal bellows (2) in the furnace wall (1) of boiler front wall, overfiren air port (5) communicates with bellows (2), is provided with the nozzle (3) that communicates with burner hearth more than two on bellows (2).
2. the Secondary Air structure of biomass burning shaped fuel boiler according to claim 1, is characterized in that, five nozzles (3) evenly are set in the boiler of 2 tons/hour.
3. the Secondary Air structure of biomass burning shaped fuel boiler according to claim 1, it is characterized in that, nozzle (3) is by nozzle housing (31), nozzle eddy flow core pipe (32), two with top nozzle swirl vane (33), nozzle covering ring plate (34) consists of, nozzle housing (31) is hollow pipe, nozzle eddy flow core pipe (32) is the pipe of upper end closed, nozzle covering ring plate (34) is fixed on the port of export of nozzle, the centre has through hole (341) to be the air outlet of nozzle, the lower end of nozzle swirl vane (33) is fixed on nozzle covering ring plate (34), one side fixed nozzle shell (31) inwall, the top of another side and nozzle eddy flow core pipe (32) join, connecting length be nozzle eddy flow core pipe (32) overall length 1/3rd to 1/2nd between.
4. the Secondary Air structure of biomass burning shaped fuel boiler according to claim 3, it is characterized in that, have 8 spiral nozzle swirl vanes (33) tangentially to be fixed between nozzle housing (31) and nozzle eddy flow core pipe (32), the diameter of nozzle eddy flow core pipe (32) be nozzle housing (31) internal diameter 1/3rd to 1/2nd between.
5. the Secondary Air structure of biomass burning shaped fuel boiler according to claim 1, it is characterized in that, the place ahead of each nozzle (3) in bellows (2) is fixed with equal wind dividing plate (4), and all the length of wind dividing plate (4) is arranged from overfiren air port (5) from high to low.
6. the Secondary Air structure of biomass burning shaped fuel boiler according to claim 1, is characterized in that, nozzle (3) is tilted to down, and the angle that becomes with horizontal line is 5-15 °.
7. the Secondary Air structure of biomass burning shaped fuel boiler according to claim 1, is characterized in that, nozzle (3) is tilted to down, and the angle that becomes with horizontal line is 8 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310080743.XA CN103148501B (en) | 2013-03-14 | 2013-03-14 | Secondary air structure for boiler burning biomass formed fuel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310080743.XA CN103148501B (en) | 2013-03-14 | 2013-03-14 | Secondary air structure for boiler burning biomass formed fuel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103148501A true CN103148501A (en) | 2013-06-12 |
| CN103148501B CN103148501B (en) | 2015-05-13 |
Family
ID=48546725
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310080743.XA Active CN103148501B (en) | 2013-03-14 | 2013-03-14 | Secondary air structure for boiler burning biomass formed fuel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103148501B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107062199A (en) * | 2017-05-19 | 2017-08-18 | 中国矿业大学 | A kind of resistive connection slag biomass combustion machine and its application method |
| CN113639263A (en) * | 2021-08-02 | 2021-11-12 | 蒋俊芳 | Circulating fluidized bed boiler |
| CN115338050A (en) * | 2021-05-12 | 2022-11-15 | 马丁有限公司 | Nozzle, flue gas discharge device with nozzle and use method of nozzle |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10205734A (en) * | 1997-01-14 | 1998-08-04 | Takuma Co Ltd | Secondary air supply method in stoker type combustion furnace |
| CN201191004Y (en) * | 2008-04-25 | 2009-02-04 | 东方锅炉（集团）股份有限公司 | Air nozzle for side wall of station boiler hearth |
| JP2010223474A (en) * | 2009-03-23 | 2010-10-07 | Mitsubishi Heavy Industries Environment & Chemical Engineering Co Ltd | Stoker type incinerator and its operation method |
| CN202361400U (en) * | 2011-06-08 | 2012-08-01 | 西安交通大学 | Structure of secondary air blowing pipe |
| CN102734827A (en) * | 2012-06-12 | 2012-10-17 | 西安交通大学 | Grate-fired furnace air chamber structure capable of transversely uniformly distributing air |
| CN203131854U (en) * | 2013-03-14 | 2013-08-14 | 福建绿源新能源科技有限公司 | Secondary air structure of boiler for burning biomass briquettes |
-
2013
- 2013-03-14 CN CN201310080743.XA patent/CN103148501B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10205734A (en) * | 1997-01-14 | 1998-08-04 | Takuma Co Ltd | Secondary air supply method in stoker type combustion furnace |
| CN201191004Y (en) * | 2008-04-25 | 2009-02-04 | 东方锅炉（集团）股份有限公司 | Air nozzle for side wall of station boiler hearth |
| JP2010223474A (en) * | 2009-03-23 | 2010-10-07 | Mitsubishi Heavy Industries Environment & Chemical Engineering Co Ltd | Stoker type incinerator and its operation method |
| CN202361400U (en) * | 2011-06-08 | 2012-08-01 | 西安交通大学 | Structure of secondary air blowing pipe |
| CN102734827A (en) * | 2012-06-12 | 2012-10-17 | 西安交通大学 | Grate-fired furnace air chamber structure capable of transversely uniformly distributing air |
| CN203131854U (en) * | 2013-03-14 | 2013-08-14 | 福建绿源新能源科技有限公司 | Secondary air structure of boiler for burning biomass briquettes |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107062199A (en) * | 2017-05-19 | 2017-08-18 | 中国矿业大学 | A kind of resistive connection slag biomass combustion machine and its application method |
| CN107062199B (en) * | 2017-05-19 | 2023-12-05 | 中国矿业大学 | An anti-slagging biomass burner and its use method |
| CN115338050A (en) * | 2021-05-12 | 2022-11-15 | 马丁有限公司 | Nozzle, flue gas discharge device with nozzle and use method of nozzle |
| CN113639263A (en) * | 2021-08-02 | 2021-11-12 | 蒋俊芳 | Circulating fluidized bed boiler |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103148501B (en) | 2015-05-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107559827B (en) | A kind of ultra-low nitrogen gas burner | |
| CN207539904U (en) | Ultralow nitrogen gas burner | |
| CN102434878A (en) | Three-layer secondary air low nitrogen oxide swirling burner | |
| CN101561138B (en) | Secondary Concentration Double Nozzle Minute Oil Quantity Ignition Coal Pulverized Device | |
| CN203024146U (en) | Efficient desulfurization low-nitrogen coal powder burning combination device | |
| CN103148501B (en) | Secondary air structure for boiler burning biomass formed fuel | |
| CN203131854U (en) | Secondary air structure of boiler for burning biomass briquettes | |
| CN203731392U (en) | U-shaped flame boiler with overhead straight-through pulverized coal burner | |
| CN102297426A (en) | Hydrogen gas combustor | |
| CN201606876U (en) | Low-NOx coal burner | |
| CN101349435B (en) | Plasma ignition combustor | |
| CN106196041A (en) | Multiple stage separation annular return formula axial rotational flow burner | |
| CN105737145B (en) | One kind reinforcing concentrated type vortex burner | |
| CN205640895U (en) | Combustion system | |
| CN105240862B (en) | A kind of gas flare | |
| CN204358722U (en) | Vortex burner | |
| CN104100971B (en) | A kind of turbulent burner of First air air-coal separating | |
| CN207179655U (en) | A kind of methanol burner | |
| CN210964678U (en) | Smoke air mixing box with multiple built-in distributors | |
| CN109631025A (en) | A kind of Anti-slagging swirling pulverized coal combustion device suitable for industrial coal powder boiler | |
| CN202024323U (en) | Powder fuel combustor | |
| CN101603684B (en) | A pulverized coal combustion device with multiple oil guns and a small amount of oil | |
| CN109973998A (en) | Axial swirl vanes for swirl burner and arrangement thereof | |
| CN104121579A (en) | Boiler provided with dual-register pulverized coal burner on top | |
| CN108759084A (en) | A kind of energy-saving hot air stove |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |