CN104154533A - Reverse flow pre-mixing type pulverized coal low-nitrogen combustor and combustion method thereof - Google Patents
Reverse flow pre-mixing type pulverized coal low-nitrogen combustor and combustion method thereof Download PDFInfo
- Publication number
- CN104154533A CN104154533A CN201410423319.5A CN201410423319A CN104154533A CN 104154533 A CN104154533 A CN 104154533A CN 201410423319 A CN201410423319 A CN 201410423319A CN 104154533 A CN104154533 A CN 104154533A
- Authority
- CN
- China
- Prior art keywords
- air
- air pipe
- central tube
- bluff body
- wind
- 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
Abstract
The invention discloses a reverse flow pre-mixing type pulverized coal low-nitrogen combustor and a combustion method of the reverse flow pre-mixing type pulverized coal low-nitrogen combustor. The problems that a pulverized coal combustor is long in ignition time, poor in stability and coal type adaptability and large in NOX emission are solved. The combustor comprises a primary wind central tube, an inner secondary wind tube, an outer secondary wind tube, a bluff body and a flared opening. The primary wind central tube, the inner secondary wind tube and the outer secondary wind tube are sequentially installed in parallel from inside to outside, and adjusting baffles are arranged on inlets of the inner secondary wind tube and the outer secondary wind tube and are adjustable in opening degree. A rotary flow blade is arranged in the circumferential direction of the outer secondary wind tube and is adjustable in the axial direction. The bluff body is of a disc-shaped structure and is fixed to the front of the outlet end of the primary wind central tube. The middle of the windward face is protruded, the outer side of the windward face is an arc-shaped groove, and the fire-countering face is a plane. The flared opening is formed in the tail end of the combustor and used for arranging the primary wind central tube, the inner secondary wind tube, the outer secondary wind tube and the bluff body in the combustor in a shrinking mode. The coal type adaptability and flame stability are improved, and the NOX emissions are reduced.
Description
Technical field
The present invention relates to industrial coal powder boiler combustion system, be specifically related to the premixed coal dust low NO of a kind of adverse current and combustion method thereof.
Background technology
Up to now, approximately 500,000 of China's coal-burned industrial boiler recoverable amounts, account for 85% left and right of Industrial Boiler total amount, are mainly used in the fields such as industrial production and building and heating, and user's neighborhood covering is wide general, nearly 700,000,000 tons of year consumption coal.The problems such as yet the coal-burned industrial boiler ubiquity efficiency of combustion of China is low, seriously polluted.
First, the average operating efficiency of the existing coal-burned industrial boiler of China is only 60%-65%, than the low 15-20 percentage point of Foreign Advanced Lerel, and the SO that annual coal-burned industrial boiler produces
2approximately 1,000 ten thousand tons, NO
xapproximately 1,000,000 tons of approximately 2,000,000 tons, dust, discharge capacity is only second to coal fired power generation.From existing achievement in research, SO
2and Dust Control Technology developed comparatively ripe, but NO
xcontrol technology be still the difficult point that coal-burned industrial boiler pollutes control field, therefore, how to improve the performance of combustion technology and burner, be to solve NO
xthe effective way of polluting.
Secondly, the resource of the low-volatite coal such as China's meager coal, anthracite is extremely abundant, but this coal is extremely difficult for catching fire and after-flame, peaking operation is very difficult, and existing coal-burning installation is when this type of coal of burning, there is ignition difficulties and serious stable combustion problem, be badly in need of being improved.
In sum, the problem such as coal burner ubiquity duration of ignition of the existing Industrial Boiler of China is long, fuel consumption is large, and flame holding is poor, and coal adaptability is poor, and can not effectively control NO
xdischarge capacity, be difficult to reach NO
xemission request, be difficult to meet day by day harsh environmental protection standard.
Summary of the invention
The object of the invention is to solve the length duration of ignition, poor stability that coal burner exists, coal adaptability is poor and NO
xthe large problem of discharge capacity, and provide the premixed coal dust low NO of a kind of adverse current and combustion method thereof.
The present invention is achieved by the following technical solutions:
The premixed coal dust low NO of a kind of adverse current, comprise wind central tube one time, inner second air pipe, outer second air pipe, bluff body, enlarging, a described wind central tube, inner second air pipe, outer second air pipe is set with from the inside to the outside successively side by side, in described, the porch of outer second air pipe is equipped with the adjustable controllable register of aperture, in described outer second air pipe, be circumference and have axially adjustable swirl vane, described bluff body is disc-shaped structure, be fixed on before the port of export of a wind central tube, the center protrusion of windward side wherein, outside is arc groove, and counter-fire face is plane, end at described burner is provided with enlarging, by a wind central tube, inner second air pipe, outer second air pipe, bluff body shrinks in burner.
Further, the spout front end of described inner second air inside pipe wall is furnished with guide ring.
The eddy flow angle of described swirl vane is 35-55
o.
Described bluff body is fixed on before the port of export of a wind central tube with gusset fixed form.
The combustion method of said burner is:
Middle low-temperature circulating flue gas is by a described wind central tube pulverized coal conveying, primary wind and powder air-flow is met after bluff body, forms counter blow powder air-flow, carries out premix with the premix direct current inner second air through described inner second air pipe input, mixed powder air-flow, through the ejection of inner second air spout, is sent into burner hearth; The adjustable shaft of outer second air in described outer second air pipe produces rotating jet after swirl vane, through outer second air enlarging ejection, sends into burner hearth.
Further, take axial flow velocity as 15～18m/s, the middle low-temperature circulating flue gas of 200～300 ℃ is a wind; Take flow velocity as 18～30m/s, preheating or be inner second air without the combustion air of preheating; Take axial flow velocity as 30～45m/s, preheating or be outer second air without the combustion air of preheating.
During burning, primary wind and powder air-flow is subject to the effect of bluff body in exit, and reversal of direction of flow occurs, and forms with inner second air and flows to contrary wind powder stream, when having strengthened coal dust and mixed with combustion air, and again can be in the lower oxygen gesture of compare great region, burner front end center maintenance; The primary wind and powder stream of reverse flow and the effect of liquidating of inner second air air-flow, can be reduced to lower level by the discharging jet speed of two strands of air-flows, is conducive to pulverized coal flame diffusion and stable; Inner second air passage front inner wall is provided with guide ring, and strengthening inner second air mixes with adverse current primary wind and powder; The outer second air swirling eddy form with higher-strength after axial rotational flow blade of flowing through is sprayed by burner nozzle, in burner front end central area, form the burner hearth high temperature gases recirculating district of certain volume, strengthening backflow high-temperature flue gas mixes with wind powder air-flow, stablize pulverized coal flame, accelerate the burning of coal dust.
Compared with prior art, the present invention has the following advantages:
(1) improve coal adaptability: the weak point of low-volatile coal is that ignition and steady combustion exists larger difficulty, the present invention is by regulating premix inner second air air quantity, before realizing coal powder ignition, Coal rank has different mixed airflow concentration, guarantee igniting and the steady combustion of Coal rank, can improve the adaptability of coal;
(2) reduce NO
xdischarge capacity: by regulating the inner second air air quantity of premix, realize the low coefficient of excess air (≤0.75) in the larger region of flame kernel, guarantee the reducing atmosphere in the longer scope of burner axis direction of combustion chamber, control fuel type NO
xgeneration;
(3) improve the flame holding of coal dust: by regulating premix inner second air air quantity, control ignition distance, guarantee coal dust smooth combustion within the scope of burner outlet 200-500mm;
(4) mixed effect of strengthening primary wind and powder and inner second air: realize the appropriate supply that coal powder ignition and initiation combustion can obtain oxygen in time, improve pulverized coal flame temperature, overcome the defect that middle-size and small-size industrial coal powder boiler fractional cold is high, flame temperature drop gradient is large, for sneaking into combustion reaction of middle and later periods outer second air of burning, create good temperature conditions, guarantee that coal dust can sufficient combustion;
(5) can realize the of short duration igniting of micro-oil: by regulating premix inner second air air quantity, the discharge concentration of regulation and control Coal rank reduces ignition heat as far as possible, makes it to realize quick tiny-oil ignition in the center of recirculating zone.
Accompanying drawing explanation
Fig. 1 is the structural representation of burner of the present invention;
In figure: 1-inferior wind central tube, 2-inner second air pipe, 3-outer second air pipe, 4-controllable register, 5-swirl vane, 6-guide ring, 7-bluff body, 8-enlarging.
The specific embodiment
For illustrating that better technical characterictic of the present invention, object and beneficial effect have more clearly, understand, referring now to 1 pair of technical scheme of the present invention of accompanying drawing, carry out following detailed description, but can not be interpreted as restriction that can practical range of the present invention.
The premixed coal dust low NO of a kind of adverse current as shown in Figure 1, comprise wind central tube 1 one time, inner second air pipe 2, outer second air pipe 3, bluff body 7, enlarging 8, a described wind central tube 1, inner second air pipe 2, outer second air pipe 3 is set with from the inside to the outside successively side by side, in described, the porch of outer second air pipe is equipped with the adjustable controllable register of aperture 4, in described outer second air pipe, be circumference and have axially adjustable swirl vane 5, described bluff body 7 is disc-shaped structure, be fixed on before the port of export of a wind central tube 1, the center protrusion of windward side wherein, outside is arc groove, and counter-fire face is plane, end at burner is provided with enlarging 8, by a wind central tube 1, inner second air pipe 2, outer second air pipe 3, bluff body 7 shrinks in burner.
Wherein the spout front end of inner second air pipe 2 inwalls is furnished with guide ring 6, and the eddy flow angle of swirl vane 5 is 35-55
o.
The combustion method of said burner is:
Take axial flow velocity as 15～18m/s, and the middle low-temperature circulating flue gas of 200～300 ℃ is a wind; Take flow velocity as 18～30m/s, preheating or be inner second air without the combustion air of preheating; Take axial flow velocity as 30～45m/s, preheating or be outer second air without the combustion air of preheating; Primary wind and powder air-flow is met after bluff body, forms counter blow powder air-flow, carries out premix with the premix direct current inner second air through described inner second air pipe input, and mixed powder air-flow, through the ejection of inner second air spout, is sent into burner hearth; The adjustable shaft of outer second air in described outer second air pipe produces rotating jet after swirl vane, through outer second air enlarging ejection, sends into burner hearth.
More than describe the preferred embodiment of the present invention in detail; but the present invention is not limited to the detail in above-mentioned embodiment; within the scope of technical conceive 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 (6)
1. the premixed coal dust low NO of adverse current, it is characterized in that, comprise a wind central tube (1), inner second air pipe (2), outer second air pipe (3), bluff body (7), enlarging (8), a described wind central tube (1), inner second air pipe (2), outer second air pipe (3) is set with from the inside to the outside successively side by side, in described, the porch of outer second air pipe is equipped with the adjustable controllable register of aperture (4), in described outer second air pipe, be circumference and have axially adjustable swirl vane (5), described bluff body (7) is disc-shaped structure, be fixed on before the port of export of a wind central tube (1), the center protrusion of windward side wherein, outside is arc groove, and counter-fire face is plane, end at burner is provided with enlarging (8), by a wind central tube (1), inner second air pipe (2), outer second air pipe (3), bluff body (7) shrinks in burner.
2. the premixed coal dust low NO of a kind of adverse current according to claim 1, is characterized in that, the spout front end of described inner second air pipe (2) inwall is furnished with guide ring (6).
3. the premixed coal dust low NO of a kind of adverse current according to claim 1 and 2, is characterized in that, the eddy flow angle of described swirl vane (5) is 35-55
o.
4. the premixed coal dust low NO of a kind of adverse current according to claim 1 and 2, is characterized in that, described bluff body (7) is fixed on before the port of export of a wind central tube (1) in gusset mode.
5. the combustion method of burner claimed in claim 1, is characterized in that:
Primary wind and powder air-flow is met after bluff body, forms counter blow powder air-flow, carries out premix with the premix direct current inner second air through described inner second air pipe input, and mixed powder air-flow, through the ejection of inner second air spout, is sent into burner hearth; The adjustable shaft of outer second air in described outer second air pipe produces rotating jet after swirl vane, through outer second air enlarging ejection, sends into burner hearth.
6. the combustion method of burner according to claim 5, is characterized in that:
Take axial flow velocity as 15～18m/s, and the middle low-temperature circulating flue gas of 200～300 ℃ is a wind; Take flow velocity as 18～30m/s, preheating or be inner second air without the combustion air of preheating; Take axial flow velocity as 30～45m/s, preheating or be outer second air without the combustion air of preheating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410423319.5A CN104154533A (en) | 2014-08-26 | 2014-08-26 | Reverse flow pre-mixing type pulverized coal low-nitrogen combustor and combustion method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410423319.5A CN104154533A (en) | 2014-08-26 | 2014-08-26 | Reverse flow pre-mixing type pulverized coal low-nitrogen combustor and combustion method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104154533A true CN104154533A (en) | 2014-11-19 |
Family
ID=51880101
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410423319.5A Pending CN104154533A (en) | 2014-08-26 | 2014-08-26 | Reverse flow pre-mixing type pulverized coal low-nitrogen combustor and combustion method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104154533A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107339689A (en) * | 2017-07-01 | 2017-11-10 | 重庆富燃科技股份有限公司 | Combustion burner air surplus coefficient reduces the device and method of nitrogen oxides in a kind of regulation |
| CN109000226A (en) * | 2018-08-31 | 2018-12-14 | 煤科院节能技术有限公司 | A kind of air-cooled burner |
| CN109028051A (en) * | 2018-10-22 | 2018-12-18 | 北京巴布科克·威尔科克斯有限公司 | The low CO high-efficient pulverized coal burner of three eddy flows of one kind |
| CN110186037A (en) * | 2019-06-26 | 2019-08-30 | 国电龙源节能技术有限公司 | It is a kind of based on the vortex burner being pyrolyzed in advance |
| CN111520717A (en) * | 2020-04-09 | 2020-08-11 | 华侨大学 | Hierarchical low-nitrogen gas burner based on rotational flow |
| CN113713643A (en) * | 2021-08-25 | 2021-11-30 | 一汽解放汽车有限公司 | Hydrogen fuel cell tail exhaust mixing and diluting device and hydrogen fuel cell |
| CN111520717B (en) * | 2020-04-09 | 2024-06-07 | 华侨大学 | Hierarchical low nitrogen gas burner based on whirl |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4660768A (en) * | 1985-04-17 | 1987-04-28 | Deutsche Babcock Werke Aktiengesellschaft | Nozzle for injecting solids pneumatically |
| FR2842584A1 (en) * | 2002-07-17 | 2004-01-23 | Fritz Schoppe | Powdered coal burner flame stability enhancer and process uses primary flame to pre-heat coal before it is fed with heated air to main flame |
| CN201137936Y (en) * | 2007-11-02 | 2008-10-22 | 东方日立锅炉有限公司 | Cyclone coal powder burner |
| CN102878553A (en) * | 2012-09-17 | 2013-01-16 | 华中科技大学 | Anti-slag-bonding whirling pulverized coal combustor with low NOx |
| CN204165044U (en) * | 2014-08-26 | 2015-02-18 | 山西蓝天环保设备有限公司 | The premixed coal dust low NO of a kind of adverse current |
-
2014
- 2014-08-26 CN CN201410423319.5A patent/CN104154533A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4660768A (en) * | 1985-04-17 | 1987-04-28 | Deutsche Babcock Werke Aktiengesellschaft | Nozzle for injecting solids pneumatically |
| FR2842584A1 (en) * | 2002-07-17 | 2004-01-23 | Fritz Schoppe | Powdered coal burner flame stability enhancer and process uses primary flame to pre-heat coal before it is fed with heated air to main flame |
| CN201137936Y (en) * | 2007-11-02 | 2008-10-22 | 东方日立锅炉有限公司 | Cyclone coal powder burner |
| CN102878553A (en) * | 2012-09-17 | 2013-01-16 | 华中科技大学 | Anti-slag-bonding whirling pulverized coal combustor with low NOx |
| CN204165044U (en) * | 2014-08-26 | 2015-02-18 | 山西蓝天环保设备有限公司 | The premixed coal dust low NO of a kind of adverse current |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107339689A (en) * | 2017-07-01 | 2017-11-10 | 重庆富燃科技股份有限公司 | Combustion burner air surplus coefficient reduces the device and method of nitrogen oxides in a kind of regulation |
| CN109000226A (en) * | 2018-08-31 | 2018-12-14 | 煤科院节能技术有限公司 | A kind of air-cooled burner |
| CN109000226B (en) * | 2018-08-31 | 2023-12-29 | 北京天地融创科技股份有限公司 | Air-cooled burner |
| CN109028051A (en) * | 2018-10-22 | 2018-12-18 | 北京巴布科克·威尔科克斯有限公司 | The low CO high-efficient pulverized coal burner of three eddy flows of one kind |
| CN109028051B (en) * | 2018-10-22 | 2024-04-30 | 北京巴布科克·威尔科克斯有限公司 | Three-cyclone low-CO high-efficiency pulverized coal burner |
| CN110186037A (en) * | 2019-06-26 | 2019-08-30 | 国电龙源节能技术有限公司 | It is a kind of based on the vortex burner being pyrolyzed in advance |
| CN111520717A (en) * | 2020-04-09 | 2020-08-11 | 华侨大学 | Hierarchical low-nitrogen gas burner based on rotational flow |
| CN111520717B (en) * | 2020-04-09 | 2024-06-07 | 华侨大学 | Hierarchical low nitrogen gas burner based on whirl |
| CN113713643A (en) * | 2021-08-25 | 2021-11-30 | 一汽解放汽车有限公司 | Hydrogen fuel cell tail exhaust mixing and diluting device and hydrogen fuel cell |
| CN113713643B (en) * | 2021-08-25 | 2023-09-26 | 一汽解放汽车有限公司 | Tail exhaust mixing dilution device of hydrogen fuel cell and hydrogen fuel cell |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN204165044U (en) | The premixed coal dust low NO of a kind of adverse current | |
| CN107559827B (en) | Ultralow nitrogen gas burner | |
| CN103759258B (en) | A kind of joint low nitrogen vortex burner of oil/gas ignition smooth combustion | |
| CN103615717A (en) | Novel oxygen enrichment tiny-oil ignition and ultralow load stable-combustion combustor | |
| CN102434878A (en) | Three-layer secondary air low nitrogen oxide swirling burner | |
| CN205137451U (en) | Force to draw low NOx gas combustion ware of penetrating flue gas backward flow | |
| CN104154533A (en) | Reverse flow pre-mixing type pulverized coal low-nitrogen combustor and combustion method thereof | |
| WO2021169326A1 (en) | Low-nitrogen gas burner suitable for medium-and-low heat value fuels | |
| CN101876433A (en) | Whirl pulverized coal burner used for industrial stove and adopting gas recirculation | |
| CN107525067B (en) | Central powder feeding rotational flow pulverized coal combustion device capable of preventing slag bonding of water-cooled wall | |
| CN109931605B (en) | Multistage air distribution radial outer thick and inner thin cyclone burner | |
| CN104613466A (en) | Double-volute swirl type pulverized coal burner provided with natural gas spray pipe and pre-burning chamber | |
| CN102537959B (en) | Rotational flow and direct current combined gas burner | |
| CN104154532A (en) | Center air ring concentrated type turbulent burner | |
| CN201885229U (en) | Low-emission high-power sectionalized combustion gas burner | |
| CN204901756U (en) | Partly mix low NOx burner in advance | |
| CN205480978U (en) | Minimum discharge combustor | |
| CN203036634U (en) | Fractional combustion low-nitrogen oxide rotational flow burner | |
| CN208859604U (en) | For gas fired-boiler smoke backflow internal-external double circulation low NO and gas fired-boiler | |
| CN109099425B (en) | Flue gas inner loop ultralow nitrogen combustor | |
| CN208418734U (en) | A kind of low-NOx combustor for natural gas and coal dust | |
| CN208457952U (en) | A kind of annular return type turbulent burner of avoidable scaling loss | |
| CN208859599U (en) | Swirl injection burner | |
| CN108397774A (en) | It is a kind of to be used for natural gas and the coal dust individually burner of burning or multifuel combustion | |
| CN212108382U (en) | Multi-nozzle air distribution low-nitrogen combustor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| AD01 | Patent right deemed abandoned |
Effective date of abandoning: 20170609 |
|
| AD01 | Patent right deemed abandoned |