CN106051759B - Multi-stage separation central backflow formula axial rotational flow burner - Google Patents
Multi-stage separation central backflow formula axial rotational flow burner Download PDFInfo
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- CN106051759B CN106051759B CN201610521254.7A CN201610521254A CN106051759B CN 106051759 B CN106051759 B CN 106051759B CN 201610521254 A CN201610521254 A CN 201610521254A CN 106051759 B CN106051759 B CN 106051759B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D1/00—Burners for combustion of pulverulent fuel
- F23D1/02—Vortex burners, e.g. for cyclone-type combustion apparatus
Abstract
A kind of multi-stage separation central backflow formula axial rotational flow burner.Existing turbulent burner technology is up for further reducing NOx emission.Primary air piping elbow of the present invention（1）With primary air piping horizontal segment（2）Connection, there is central air hose component at primary air piping horizontal segment center（5）With coupled steady combustion ring（7）, entrance has coal dust uniform device（3）, nearly outlet have venturi pulverized coal concentrator（4）, have secondary air channel outside primary air piping horizontal segment（10）, Secondary Air air lock（13）It is flared with secondary air channel（17）, have tertiary-air pipe outside secondary air channel（11）, tertiary air air lock（14）It is flared with tertiary-air pipe（18）, tertiary air is equipped with tertiary air eddy flow adjusting mechanism（15）, have four air hoses outside tertiary-air pipe（12）, four times wind is equipped with four wind eddy flow adjusting mechanisms（16）, four times wind tube outlet connects panelized-tube-wall section（19）.The present invention is used for multi-stage separation central backflow formula axial rotational flow burner.
Description
Technical field：
The present invention relates to the high-efficiency cleaning field of combustion technology of coal, are specifically to provide a kind of multi-stage separation central backflow formula axis
To turbulent burner.
Background technology：
Existing wall face-fired boiler turbulent burner technology is also different according to its different NOx emission of coal quality, for dry
Dry ash free basis volatilization is divided into the bituminous coal of 36-38%, the accessible NOx emission of the prior art substantially 240-280mg/Nm3（6%
O2, dry flue gas）, be divided into for dry ash free basis volatilization 13% meager coal, the prior art can reach 600-650mg/Nm3（6% O2,
Dry flue gas）, these concentration are much higher than at present down to 50mg/Nm3（6% O2, dry flue gas）Newest emission regulation, therefore, very
Met most with reducing denitrating flue gas expense to greatest extent it is necessary to be further improved burner design, improve burner performance
New emission regulation.
The NOx generated in coal combustion process is mainly made of heating power NOx and fuel NO_x two parts：Heating power NOx is by burning
A small part nitrogen in air is generated by oxidation, accounts for the 20-30% of total NOx；Fuel NO_x is aoxidized by a part of nitrogen in coal
Generation, accounts for the 70-80% of total NOx, and coal fire discharged NOx destroys outside ecological environment except forming acid rain, can also form photochemistry
Smog directly endangers human health, it is therefore necessary to be effectively controlled.
Power station fire coal is one of main source of NOx emission in air, and the control of coal burning boiler of power station NOx emission can be by firing
Controlled during burning and burning after fume treatment realize that and control is mainly by using low-NOx combustor in combustion process
In addition sectional combustion technology is completed in stove, with to the increasingly stringent of power station coal contaminants emission control, to combustion process
The control of middle NOx generations also has higher requirement.
The content of the invention：
The object of the present invention is to provide a kind of multi-stage separation central backflow formula axial rotational flow burners.
Above-mentioned purpose is realized by following technical scheme：
A kind of multi-stage separation central backflow formula axial rotational flow burner, composition include：Primary wind and powder system, total Secondary Air
System, the primary wind and powder system include primary air piping elbow, and the primary air piping elbow passes through flange and primary air piping
Horizontal segment connects, and secondary air channel is equipped with outside the primary air piping horizontal segment, and the secondary air channel port of export is equipped with one
A to be flared with the axial secondary air channel for having certain angle, this flaring is connected by welding manner and reinforcing plate with secondary air channel, institute
Tertiary-air pipe is installed, the tertiary-air pipe port of export sets that there are one have certain angle with axial outside the secondary air channel stated
Tertiary-air pipe is flared, this flaring is connected by welding manner and reinforcing plate with tertiary-air pipe, installation outside the tertiary-air pipe
Have four air hoses, the primary air piping horizontal segment and secondary air channel, the secondary air channel and tertiary-air pipe, it is described three times
It is supported between air hose and four air hoses in front and back end by the holding device of special designing, described four wind tube outlets
End is equipped with panelized-tube-wall section.
The multi-stage separation central backflow formula axial rotational flow burner, the primary air piping horizontal segment arrival end top
It installs there are one crescent coal dust uniform device, the nearly port of export of primary air piping horizontal segment to be equipped with venturi Pulverized Coal Concentration
Device, the primary air piping horizontal segment center are equipped with central air hose component, and the central air hose module outlet end leads to
It crosses stent to be connected with primary air piping horizontal segment, arrival end is connected by the face flange that inclines with the primary air piping elbow, described
Central air hose module outlet end connects with steady combustion boxing, and the central air hose component center is equipped with oil gun component, described
Oil gun module outlet end be supported on by impeller in central air hose component, arrival end passes through flange and central air hose module inlet
End is connected.
The multi-stage separation central backflow formula axial rotational flow burner, total secondary air system include bellows, institute
The bellows stated are connected with welding manner with primary air piping horizontal segment and four air hoses, and total air lock is equipped with outside the bellows
Component, total air lock component are the coaxial cylinders being located on the outside of bellows, can by its pulley, guide rail and connecting rod
It being axially moveable to adjust its throttle opening, the nearly port of export of the tertiary-air pipe is disposed with tertiary air eddy flow adjusting mechanism, this
Adjusting mechanism is that one group of axial swirl blades being equally spaced is installed on the circumference of tertiary-air pipe passage, and each blade passes through
The ring flat-plate that its positioning rotating shaft and drive link are mounted on one on the outside of four air hoses is connected, described four nearly ports of export of air hose
Four wind eddy flow adjusting mechanisms are disposed with, this adjusting mechanism is to install one group on the circumference of four air hose passages to be equally spaced
Axial swirl blades, each blade passes through the ring flat-plate that its positioning rotating shaft and drive link are mounted on one on the outside of four air hoses
Connection, that is, tertiary air and four wind swirl vanes are respectively connected with a ring flat-plate, the two ring flat-plates respectively by its pulley, lead
Rail and connecting rod can axially move to adjust blade with axial angle so as to adjust its swirl strength, the Secondary Air
Pipe, the tertiary-air pipe inlet are separately installed with the Secondary Air air lock of taper, tertiary air air lock to control its air quantity, this two
A taper air lock is also that can axially move to adjust its throttle opening by its pulley and connecting rod.
Advantageous effect：
1. low NOx cyclone burner of the present invention is by 18MW cold conditions and hot test, numerical simulation calculation, test burn device
To Actual combustion device Enlargement Design, applied to multiple power station meager coal engineering projects, the coal adaptability of burner of the present invention is strong,
It is divided into 13% meager coal for dry ash free basis volatilization, is expected to boiler export NOx emission being reduced to 550mg/Nm3（6% O2）With
Under, uncompleted burned carbon low level heat loss is below 0.6%.
Burner of the present invention also has relatively low running resistance, and a wind resistance is no more than 800Pa, and total secondary wind resistance does not surpass
1300Pa is crossed, this burner can keep good combustion stability under all loads, not generate spout coking.
The low NOx axial rotational flow burners of the present invention have the separation of primary wind and powder multi-stage bias, main burning air deep-graded
The features such as with Central backflow area is formed, the generation of NOx can be reduced to greatest extent.
The First air of burner of the present invention carries coal dust and enters primary air piping horizontal segment by primary air piping elbow, once
The coal dust uniform device for crescent that there are one air hose horizontal segment arrival end top arrangements, to adjust in primary air piping elbow due to air-flow
Change flow direction and Particle Inertia effect and caused by it is upper it is dense under light uneven coal dust distribution, primary wind and powder passes through coal dust
Substantially tend to be uniformly distributed after uniform device, after venturi pulverized coal concentrator, be generated on primary air piping Outlet Section
Interior dense outer light concentration distribution, and burner hearth is injected here.
Burner of the present invention by bellows Lai main burning air be divided into Secondary Air, tertiary air and four wind, to increase air
Classification degree, Secondary Air are direct current, and air quantity is smaller, and effect is to form one of air partition wall to postpone First air and the main combustion in periphery
Air mixing is burnt, that is, anaerobic environment is formed in nearly burner region, is conducive to NOx reduction, tertiary air and four wind are eddy flow,
Wind speed is larger, injects burner hearth after one group of circumferentially disposed axial swirl blades respectively, effect is far to burn
Device area completes the burning of uncompleted burned carbon, and promotes to form a recirculating zone in nearly burner region.
The present invention is set in the central air hose port of export there are one steady combustion ring, also respectively in secondary air channel and tertiary-air pipe exit
With axially there is the flaring of certain angle there are one if, to postpone the mixing of tertiary air and four wind and primary wind and powder, so as near
Burner region forms anaerobic environment, is conducive to NOx reduction.
The distinctive spout structure of low-NOx combustor of the present invention is formed in nearly burner region primary wind and powder jet area in one
Interior dense outer light primary wind and powder can be rolled up seat in recirculating zone by heart recirculating zone, the Central backflow area；High-temperature flue gas is taken back closely
Primary wind and powder is heated in burner region, promotes pulverized coal ignition, keeps flame holding；The high-temperature flue gas oxygen content taken back is low, makes
Recirculating zone is in anaerobic environment, is conducive to NOx reduction.
Burner Secondary Air of the present invention to four wind are gradually deviated from First air and fuel from inside to outside, so as to cause in axial direction
Upper stepped mixing and fractional combustion, this classification generate two kinds of effects：First, anaerobic environment is formed in nearly burner region, favorably
It is reduced in NOx, the burning of uncompleted burned carbon is completed by three, four wind in remote burner region；Second, heat progressively discharges, from
And flame temperature is reduced, reduce heating power NOx generations.
9. the present invention has one to four wind wind speed, eddy flow degree and the air flow rate proportioning of optimization and the primary wind and powder of optimization
Multi-stage bias separator and steady combustion ring geometry.
Present invention employs direct current First air and simple First air inlet bends to reduce by a wind resistance, reduce wind turbine
Energy consumption, and simplify structure, reduce cost, axial rotational flow mechanism of the invention have it is simple in structure, resistance is small, eddy flow degree tune
The advantages that whole scope is big.
Description of the drawings：
Attached drawing 1 is the structure diagram of the present invention.
Attached drawing 2 is the coal dust uniform device structure diagram in attached drawing 1.
Attached drawing 3 is the primary air piping outlet Pulverized Coal Concentration ribbon simulation test figure in attached drawing 1.
Attached drawing 4 is the steady combustion ring structure schematic diagram in attached drawing 1.
Attached drawing 5 is multi-stage separation central backflow formula axial rotational flow burner flow field structure figure.
Specific embodiment：
Embodiment 1：
A kind of multi-stage separation central backflow formula axial rotational flow burner, composition include：Primary wind and powder system, total Secondary Air
System, the primary wind and powder system include primary air piping elbow 1, and the primary air piping elbow passes through flange and primary air piping
Horizontal segment 2 connects, and secondary air channel 10 is equipped with outside the primary air piping horizontal segment, and the secondary air channel port of export is equipped with
One is connected with the axial secondary air channel flaring 17 for having certain angle, this flaring by welding manner and reinforcing plate with secondary air channel
It connects, tertiary-air pipe 11 is installed outside the secondary air channel, the tertiary-air pipe port of export sets that there are one have one with axial
The tertiary-air pipe flaring 18 at clamp angle, this flaring are connected by welding manner and reinforcing plate with tertiary-air pipe, the tertiary air
Four air hoses 12, the primary air piping horizontal segment and secondary air channel, the secondary air channel and tertiary air are installed outside pipe
It is supported between pipe, the tertiary-air pipe and four air hoses in front and back end by the holding device of special designing, it is described
Four wind tube outlet ends panelized-tube-wall section 19 is installed.
Embodiment 2：
Multi-stage separation central backflow formula axial rotational flow burner according to embodiment 1, the primary air piping are horizontal
For the installation of section arrival end top there are one crescent coal dust uniform device 3, the nearly port of export of primary air piping horizontal segment is equipped with text
Pulverized coal concentrator 4 in mound, the primary air piping horizontal segment center are equipped with central air hose component 5, the centre wind
The tube assembly port of export is connected by stent with primary air piping horizontal segment, arrival end by incline face flange and the primary air piping it is curved
Head connection, the central air hose module outlet end are welded with steady combustion ring 7, and the central air hose component center is equipped with
Oil gun component 6, the oil gun module outlet end are supported on by impeller in central air hose component, and arrival end is by flange in
Heart wind pipe component arrival end is connected.
Embodiment 3：
Multi-stage separation central backflow formula axial rotational flow burner according to embodiment 1 or 2, total Secondary Air system
System includes bellows 8, and the bellows are connected with welding manner with primary air piping horizontal segment and four air hoses, outside the bellows
Portion is equipped with total air lock component 9, and total air lock component is the coaxial cylinders being located on the outside of bellows, by its pulley,
Guide rail and connecting rod can axially move to adjust its throttle opening, and the nearly port of export of the tertiary-air pipe is disposed with tertiary air
Eddy flow adjusting mechanism 15, this adjusting mechanism are that one group of axial rotational flow being equally spaced is installed on the circumference of tertiary-air pipe passage
Blade, each blade is connected by the ring flat-plate that its positioning rotating shaft and drive link are mounted on one on the outside of four air hoses, described
Four nearly ports of export of air hose be disposed with four wind eddy flow adjusting mechanisms 16, this adjusting mechanism is the circumference in four air hose passages
One group of axial swirl blades being equally spaced of upper installation, each blade pass through its positioning rotating shaft and drive link and an installation
Ring flat-plate connection on the outside of four air hoses, that is, tertiary air and four wind swirl vanes are respectively connected with a ring flat-plate, the two
Ring flat-plate can axially move to adjust blade and axial angle so as to adjust its rotation by its pulley, guide rail and connecting rod respectively
Intensity of flow, the secondary air channel, the tertiary-air pipe inlet are separately installed with Secondary Air air lock 13, the tertiary air of taper
For air lock 14 to control its air quantity, the two taper air locks are also that can axially move to adjust it by its pulley and connecting rod
Throttle opening.
Embodiment 4：
Multi-stage separation central backflow formula axial rotational flow burner according to embodiment 1-3, in the multi-stage separation
Heart reverse-flow type axial rotational flow burner is made of primary wind and powder system and total secondary air system, and primary wind and powder system is by primary air piping
Elbow, primary air piping horizontal segment, coal dust uniform device, surely venturi pulverized coal concentrator, combustion ring, central air hose component and oil gun group
Part forms, and total secondary air system is by bellows, secondary air channel, tertiary-air pipe and four air hoses and its corresponding air quantity adjusts and eddy flow
Regulating device forms；
There is central air hose in the center arrangement of primary air piping horizontal segment, the center arrangement of central air hose has oil gun, and oil gun rises
Igniting, radiator and the effect surely fired in underrun for burner, capacity are generally the 20-30% of burner heat input, in
Heart air hose provides a part of combustion air for oil gun, also functions to the effect of cooling oil gun；
Primary air piping by one section of burner hearth uses heat-resistant antifriction material, and to prevent high temperature deformation and coal dust from washing away, primary air piping leans on
One section of bellows, venturi pulverized coal concentrator, coal dust uniform device and elbow use wear-resistant material to prevent coal dust from washing away, i.e., general
Logical carbon steel inner wall is packed with wear-resistant ceramic or using whole wear resistance castings, central air hose and the venturi pulverized coal concentrator portion being connected
Part is using whole wear resistance castings, and primary air piping horizontal segment component and elbow component are by flanged joint, in order to install and dismantle
And ensureing its concentricity, central air hose module outlet end is connected by stent with primary air piping horizontal segment, and arrival end passes through face of inclining
Flange is connected with elbow, and in order to install and dismantle and ensure the concentricity with primary air piping horizontal segment, the oil gun port of export passes through
Impeller is supported in central air hose, and arrival end is connected by flange with central air hose arrival end, in order to install and dismantle simultaneously
Ensure the concentricity with central air hose；
Steady combustion ring is high-quality heat-resistant antifriction casting, steady to fire ring and central air hose group to prevent high temperature deformation and coal dust from washing away
The part port of export is connected by welding manner；
This product burner is equipped with independent bellows and a total air lock device to control total secondary air flow of burner, total wind
Brake gear is the coaxial cylinders being located on the outside of bellows, can axially move to adjust by its pulley, guide rail and connecting rod
Its whole throttle opening is respectively provided with a taper air lock to control its air quantity in secondary air channel and tertiary-air pipe inlet, the two
Taper air lock is also that can axially move to adjust its throttle opening by its pulley and connecting rod, and four times air hose does not have wind
Lock, air quantity depend on the air quantity of Secondary Air and tertiary air；
One group of axial swirl blades being equally spaced is respectively provided on the circumferencial direction of tertiary air and four wind passages, often
As soon as each blade in group is connected by its positioning rotating shaft and drive link with the ring flat-plate being mounted on the outside of four air hoses,
It is that tertiary air and four wind swirl vanes are respectively connected with a ring flat-plate, the two ring flat-plates pass through its pulley, guide rail and connection respectively
Pull rod can axially move to adjust blade with axial angle so as to adjust its swirl strength, this eddy flow adjusting mechanism can realize compared with
Large-scale blade angle and swirl strength；
In front and back end between primary air piping and secondary air channel, secondary air channel and tertiary-air pipe, tertiary-air pipe and four air hoses
It is supported by the holding device of special designing, holding device ensures the concentricity between each air hose equipped with adjusting nut,
So easy for installation and precision is high, secondary air channel flaring and tertiary-air pipe flaring pass through welding manner and reinforcing plate respectively with it is secondary
Air hose is connected with tertiary-air pipe, improves bonding strength, and bellows are connected with welding manner with primary air piping and four air hoses, is protected
Burner integral rigidity is demonstrate,proved.
Claims (2)
1. a kind of multi-stage separation central backflow formula axial rotational flow burner, composition includes：Primary wind and powder system, total Secondary Air system
System, it is characterized in that：The primary wind and powder system includes primary air piping elbow, and the primary air piping elbow passes through flange and one
Secondary air hose horizontal segment connects, and secondary air channel, the secondary air channel port of export are equipped with outside the primary air piping horizontal segment
If there are one being flared with the axial secondary air channel for having certain angle, this flaring is connected by welding manner and reinforcing plate with secondary air channel
It connects, tertiary-air pipe is installed outside the secondary air channel, the tertiary-air pipe port of export sets certain there are one having with axial direction
The tertiary-air pipe flaring of angle, this flaring is connected by welding manner and reinforcing plate with tertiary-air pipe, outside the tertiary-air pipe
Portion is equipped with four air hoses, the primary air piping horizontal segment and secondary air channel, the secondary air channel and tertiary-air pipe, described
Tertiary-air pipe and four air hoses between be supported in front and back end by holding device, described four wind tube outlet ends
Panelized-tube-wall section is installed；
Total secondary air system includes bellows, and the bellows are with welding manner and primary air piping horizontal segment and four air hoses
It is connected, total air lock component is installed outside the bellows, total air lock component is one same on the outside of bellows
Axis cylinder can axially move to adjust its throttle opening, the tertiary-air pipe by its pulley, guide rail and connecting rod
The nearly port of export is disposed with tertiary air eddy flow adjusting mechanism, this adjusting mechanism is that one group is installed on the circumference of tertiary-air pipe passage
The axial swirl blades being equally spaced, each blade are mounted on four wind by its positioning rotating shaft and drive link with one
Ring flat-plate connection on the outside of pipe, described four nearly ports of export of air hose are disposed with four wind eddy flow adjusting mechanisms, this adjusting mechanism is
One group of axial swirl blades being equally spaced is installed on the circumference of four air hose passages, each blade is turned by its positioning
The ring flat-plate that axis and drive link are mounted on one on the outside of four air hoses is connected, that is, tertiary air and four wind swirl vanes
It is respectively connected with a ring flat-plate, the two ring flat-plates can axially move to adjust leaf respectively by its pulley, guide rail and connecting rod
With axial angle so as to adjust its swirl strength, the secondary air channel, the tertiary-air pipe inlet are separately installed with piece
To control its air quantity, the two taper air locks are also to be drawn by its pulley and connection for the Secondary Air air lock of taper, tertiary air air lock
Bar can axially move to adjust its throttle opening.
2. multi-stage separation central backflow formula axial rotational flow burner according to claim 1, it is characterized in that：It is described once
There are one crescent coal dust uniform device, the nearly port of export peaces of the primary air piping horizontal segment for the installation of air hose horizontal segment arrival end top
Equipped with venturi pulverized coal concentrator, the primary air piping horizontal segment center is equipped with central air hose component, in described
The heart wind pipe component port of export is connected by stent with primary air piping horizontal segment, and arrival end passes through face flange and the First air of inclining
Pipe bend connects, and the central air hose module outlet end connects with steady combustion boxing, central air hose component center peace
Equipped with oil gun component, the oil gun module outlet end is supported on by impeller in central air hose component, and arrival end passes through flange
It is connected with central air hose module inlet end.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610521254.7A CN106051759B (en) | 2016-07-05 | 2016-07-05 | Multi-stage separation central backflow formula axial rotational flow burner |
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| CN201610521254.7A CN106051759B (en) | 2016-07-05 | 2016-07-05 | Multi-stage separation central backflow formula axial rotational flow burner |
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| CN106051759A CN106051759A (en) | 2016-10-26 |
| CN106051759B true CN106051759B (en) | 2018-06-05 |
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| JP2020030037A (en) * | 2018-08-20 | 2020-02-27 | 三菱日立パワーシステムズ株式会社 | Solid fuel burner |
| JP2023160352A (en) * | 2022-04-22 | 2023-11-02 | 川崎重工業株式会社 | Pulverulent fuel burner |
| JP2023160353A (en) * | 2022-04-22 | 2023-11-02 | 川崎重工業株式会社 | Pulverulent fuel burner |
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| JP3914448B2 (en) * | 2002-03-26 | 2007-05-16 | 太平洋セメント株式会社 | Cement kiln burner equipment |
| CN203116001U (en) * | 2013-01-25 | 2013-08-07 | 福建永恒能源管理有限公司 | Low nitrogen powder fuel combustor |
| CN104421933B (en) * | 2013-08-27 | 2017-06-16 | 神华集团有限责任公司 | Primary air piping, burner and solid fuel fired boiler suitable for burner |
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