CN209540875U - A kind of straight-through pulverized coal burner - Google Patents
A kind of straight-through pulverized coal burner Download PDFInfo
- Publication number
- CN209540875U CN209540875U CN201822136869.5U CN201822136869U CN209540875U CN 209540875 U CN209540875 U CN 209540875U CN 201822136869 U CN201822136869 U CN 201822136869U CN 209540875 U CN209540875 U CN 209540875U
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- China
- Prior art keywords
- coal
- primary air
- air piping
- culm
- thin powdered
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- 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.)
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- 239000003245 coal Substances 0.000 title claims abstract description 134
- 238000010992 reflux Methods 0.000 claims description 21
- 239000002817 coal dust Substances 0.000 claims description 4
- 239000000843 powder Substances 0.000 claims description 4
- 230000005619 thermoelectricity Effects 0.000 claims 1
- 238000002485 combustion reaction Methods 0.000 abstract description 30
- 230000001535 kindling effect Effects 0.000 abstract description 11
- 238000004939 coking Methods 0.000 abstract description 8
- 230000006978 adaptation Effects 0.000 abstract description 3
- 230000008901 benefit Effects 0.000 abstract description 3
- 230000006872 improvement Effects 0.000 description 8
- 230000009467 reduction Effects 0.000 description 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 4
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 4
- 235000019504 cigarettes Nutrition 0.000 description 4
- 239000003546 flue gas Substances 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 210000004894 snout Anatomy 0.000 description 4
- 239000007921 spray Substances 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000003134 recirculating effect Effects 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 230000001464 adherent effect Effects 0.000 description 2
- 239000002671 adjuvant Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000003517 fume Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000002802 bituminous coal Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 210000000038 chest Anatomy 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 235000003642 hunger Nutrition 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000005622 photoelectricity Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 230000037351 starvation Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Abstract
The utility model discloses a kind of straight-through pulverized coal burners, including shell, pulverized coal concentrator, the thick coal culm primary air piping being connected is exported with the thick coal culm of pulverized coal concentrator, it is around in thick coal culm primary air piping partially circumferentially outer thin powdered coal primary air piping, secondary air channel, secondary air channel and thin powdered coal primary air piping in circumferentially opposed setting and are around in thick coal culm primary air piping rest part week outward, secondary air channel is located at the back-fire side of thick coal culm primary air piping, thick coal culm primary air piping spout end and thin powdered coal primary air piping spout end are arranged in spaced radial, it is dense, thin powdered coal primary air piping spout end is at the rear for being axially respectively positioned on secondary air channel spout end；The utility model can not only greatly improve itself steady combustion ability, efficiency of combustion and anti-coking ability, solve the contradiction of kindling steady combustion and flame undershoot ability, NOx emission can also be reduced, have the advantages that coal quality wide adaptation range, meet the needs of boiler for deeply peak regulation and burning low grade coal.
Description
Technical field
The utility model relates to a kind of straight-through pulverized coal burners, especially for the direct-flow pulverized coal combustion on W flame boiler
Device.
Background technique
As China's wind-powered electricity generation, photoelectricity installed capacity increase, peak period power grid digestion capability is insufficient, and light limit is abandoned in recent abandonment
It is electric serious.For consumption new energy, higher depth peak modulation capacity requirement is proposed to fired power generating unit, and depth peak modulation capacity is general
Minimum load depending on unit.For boiler combustion system, it is important to improve boiler low load stable combustion ability, therefore want
Boiler low load stable combustion ability is continuously improved.
The energy resources feature in China's " rich coal, oil starvation, few gas ", so that China is interior still based on coal for quite a long time,
Be also required to more efficient science utilizes coal resources.The cascade utilization of coal is the side of China's energy conversion Land use systems at present
To based on being pyrolyzed, gasify, low volatile " carbon residue coal " is as high-grade clean fuel combustion power generation after pyrolysis.But " carbon residue
There are the features such as kindling is difficult, burn-up efficiency is low, NOx emission is higher in coal " combustion process.In addition with the market of coal and electric power
Change, various different types of coal supply-demand relationships are in fluctuation, and each power plant is to reduce cost of electricity-generating, and power plant always constantly looks for economic coal
Kind, this results in most power plant it is difficult to ensure that using single design coal for a long time, mentions to the coal adaptability of combustion apparatus
Higher requirement out.
W flame boiler is a kind of special chamber structure boiler for low-volatite coal, has stronger steady combustion ability.But
, more or less there is the following problem: 1) surely firing ability in the existing various straight-through pulverized coal burners applied to W flame boiler
Turning too early with flame, there are burner hearths to utilize insufficient contradiction, and flame is turned too early to be caused under efficiency of combustion reduction and burnout degree
Square NOx reduction space reduces, and NOx emission is caused to increase；2) First air kindling with Secondary Air be mixed into opportunity with a Secondary Air transport
Speed when row etc. is related, it is difficult to which accurately adjustment control, it is unfavorable to steady combustion and reduction NOx emission too early that Secondary Air is mixed into, and is mixed into
Too late cannot immediately air needed for aftercombustion it is equally unfavorable to steady combustion and after-flame etc.；3) the steady combustion ability of burner itself is not dashed forward
Out, it maintains high-temperature region (laying more wall with refractory lining, refracto) surely to fire mainly by boiler lower hearth, the easy coking of burner hearth and NOx higher etc. is caused to ask
Topic.Because coal quality and boiler structure reason W flame boiler are higher compared to the NOx emission concentration value of other type of furnaces, in order to meet more
Carry out stringenter minimum discharge requirement, many power plant's W flame boilers are planned to change burning one after another or mix burning bituminous coal, but for control fuel at
This usually needs burning low grade coal again, and the coal type change adaptability of existing combustion apparatus is caused to be difficult to meet the requirements.
Summary of the invention
The purpose of this utility model is the above-mentioned deficiency for the prior art, provides a kind of straight-through pulverized coal burner, it is not
It is only capable of greatly improving itself steady combustion ability, efficiency of combustion and anti-coking ability, solves the lance of kindling steady combustion and flame undershoot ability
Shield can also reduce NOx emission, and ignition point is adjustable, have the advantages that coal quality wide adaptation range, meet boiler for deeply peak regulation and combustion
The demand of burning inferior coal.
In order to achieve the above object, a kind of straight-through pulverized coal burner of the utility model, including shell, in shell
Pulverized coal concentrator, it is characterised in that further include the thick coal culm primary air piping being connected with the outlet of the thick coal culm of pulverized coal concentrator, be around in
Thick coal culm primary air piping partially circumferentially outer thin powdered coal primary air piping, the secondary air channel being connected with shell, secondary air channel and light coal
Powder primary air piping is in circumferentially opposed setting and is around in thick coal culm primary air piping rest part week outward, and secondary air channel is located at thick coal culm
The back-fire side of primary air piping, thick coal culm primary air piping spout end and thin powdered coal primary air piping spout end are arranged in spaced radial, and two
Formation reflux cavity, thick coal culm primary air piping spout end and thin powdered coal primary air piping spout end are respectively positioned on secondary in axial direction between person
The rear at air hose spout end；
In use, after the First air containing coal dust passes through pulverized coal concentrator, respectively from thick coal culm primary air piping and thin powdered coal one
Secondary air hose sprays, and Secondary Air is sprayed through secondary air channel, mixes, burns in burner hearth；Since a dense wind snout is located at burner
Center, light first nozzle are located in burner outermost circumferential direction, and a fan annular return space is formed between two strands of air-flows, deep or light
The adherent flowing respectively in sector reflux cavity of two strands of First air breeze airflows, annular region among two strands of air-flows generate compared with
Big negative pressure can add the hot fume in burner hearth because rolling up suction effect, flowing back into fan annular return cavity to two strands of air-flows
Heat simultaneously can make its initial burning before spraying into burner hearth that can increase substantially in addition not mixing at this time with Secondary Air also in underload
With steady combustion ability when burning low grade coal；Overfire air port at fan annular be located at dense First air back-fire side, from back-fire side gradually to
Flow back cavity outlet the kindling of part breeze airflow gradually aftercombustion air, do not hinder not only high temperature gases recirculating to time
It flows and guarantees steady combustion in cavity, Secondary Air has biggish momentum together with First air, solves W flame boiler flame undershoot momentum not
The problem of foot plays and improves burner outlet entirety air-flow rigidity, prevents the effects of boiler water wall coking, two gradually sprayed into
Secondary wind forms the staged air distribution of burner internal, also helps reduction NOx emission；Breeze airflow kindling is in advance and whole air-flow is rigid
Property enhancing, extend burning time of the breeze airflow in burner hearth, be conducive to improve efficiency of combustion；
The thin powdered coal primary air piping entrance is tapered taper as a further improvement of the utility model,；It can prevent
Light primary air velocity only after air-coal separating is relatively low, further increases light First air air-flow to the reflux capability of high-temperature flue gas and prevents
Only burner outlet coking ability；
As a further improvement of the utility model, the thin powdered coal primary air piping circumferentially around angle be greater than it is secondary
Air hose circumferentially around angle；The proportion needs of primary and secondary air can be met；
Air door is equipped in the entrance of secondary air channel as a further improvement of the utility model,；It can carry out air quantity tune
Section；
The thick coal culm primary air piping spout end and the spray of thin powdered coal primary air piping as a further improvement of the utility model,
The reflux cavity at mouth end rear is connected with accessory channel, and valve is equipped in accessory channel, and orifice plate is equipped in back cavity body；Usually
Situation lower valve is in close state, to guarantee the normal work of burner；It can also be annular to fan by the aperture of control valve
Amount in reflux cavity as needed is passed through Secondary Air or the combustion adjuvants such as inertia furnace cigarette or suitable pure oxygen, high in burner hearth for adjusting
Warm smoke backflow to reflux cavity amount size, adjust the intracorporal temperature of back cavity, carry out the adjusting of ignition point, be suitable for not
Same coal quality, meets the needs of boiler for deeply peak regulation and burning low grade coal；Orifice plate can guarantee Secondary Air or inertia furnace cigarette or pure oxygen
The uniformity of feeding；
As a further improvement of the utility model, the thin powdered coal primary air piping spout end be equipped with it is several in the circumferential between
Every spout；To realize that more thermal flue gas backs flow in reflux cavity；
Bluff body is equipped in secondary air channel spout end as a further improvement of the utility model,；Be appropriately extended one,
The mixing of Secondary Air；
The periphery in the corresponding shell of thin powdered coal primary air piping is set as a further improvement of the utility model,
It is equipped with circumference air hose；By being passed through suitable Secondary Air in circumference air hose, it can protect, cool down burner nozzle；
Thermocouple is equipped in back cavity body as a further improvement of the utility model,；It is flowed back by thermocouple measurement
The intracorporal temperature of chamber, and the size of controlling opening of valve can control the temperature of different burning coals in suitable range；
In conclusion the utility model can not only greatly improve itself steady combustion ability, efficiency of combustion and anti-coking ability, solution
The certainly contradiction of kindling steady combustion and flame undershoot ability, can also reduce NOx emission, and ignition point is adjustable, have coal quality adaptation range
Wide advantage meets the needs of boiler for deeply peak regulation and burning low grade coal.
Detailed description of the invention
Fig. 1 is the structure diagram of the utility model embodiment.
Fig. 2 is the C-C cross-sectional view of Fig. 1.
Fig. 3 is the A-A cross-sectional view of Fig. 1.
Fig. 4 is the B-B cross-sectional view of Fig. 1.
Fig. 5 is the bottom view of Fig. 1.
Fig. 6 is arrangement schematic diagram of the utility model embodiment on W flame boiler.
Specific embodiment
With reference to the accompanying drawing, the utility model is described in further detail.
A kind of straight-through pulverized coal burner of the embodiment, pulverized coal concentrator 2 and coal including shell 1, in shell 1
Thick coal culm primary air piping 3 that the thick coal culm outlet of powder inspissator 2 is connected, to be around in thick coal culm primary air piping 3 partially circumferentially outer light
Coal dust primary air piping 4, the secondary air channel 5 being connected with shell 1,4 entrance of thin powdered coal primary air piping are tapered taper, thin powdered coal
In 4 spout end of primary air piping by interval cavity 15 be equipped with several spouts 13 being spaced in the circumferential, pulverized coal concentrator 2 it is light
Discharge forms thin powdered coal between thin powdered coal primary air piping 4 and shell 1 between thin powdered coal primary air piping 4 and shell 1
First air channel；Secondary air channel 5 and thin powdered coal primary air piping 4 circumferentially opposed setting and be around in thick coal culm primary air piping 3 remaining
It is partially circumferentially outer, thin powdered coal primary air piping 4 circumferentially around angle account for about the 2/3 of circumference, secondary air channel 5 circumferentially around
Angle accounts for about the 1/3 of circumference, and air door 7 is equipped in the entrance of secondary air channel 5, is equipped with bluff body 11 in 5 spout end of secondary air channel；
As shown in fig. 6, secondary air channel 5 is located at the back-fire side (side i.e. far from 16 center of burner hearth) of thick coal culm primary air piping 3, thick coal culm
3 spout end of primary air piping and 4 spout end of thin powdered coal primary air piping are arranged in spaced radial, form reflux cavity 6 therebetween,
Interior thermocouple 12,3 spout end of thick coal culm primary air piping and the 4 spout end of thin powdered coal primary air piping of being equipped with of the cavity 6 that flows back is axial equal
Positioned at the rear at 5 spout end of secondary air channel, 3 spout end of thick coal culm primary air piping and 4 spout end of thin powdered coal primary air piping are in axial direction
Can be concordant or not concordant according to specific coal quality and concentration conditions, there is different kindling initial times；Secondary air channel 5 and shell 1
Outlet it is concordant；The reflux cavity 6 and auxiliary at 4 spout end rear of 3 spout end of thick coal culm primary air piping and thin powdered coal primary air piping
Channel 8 is connected, and valve 9 is equipped in accessory channel 8, is equipped with orifice plate 10 in reflux cavity 6；It is corresponding in thin powdered coal primary air piping 4
The periphery of shell 1 be provided with circumference air hose 14；
In use, the First air containing coal dust enters 1 arrival end of shell, by after pulverized coal concentrator 2, thick coal culm First air and
It sprays in thin powdered coal First air channel of the thin powdered coal First air respectively out of thick coal culm primary air piping 3 with 4 outside of thin powdered coal primary air piping
Out, most of Secondary Air is sprayed through secondary air channel 5, is mixed, is burnt in burner hearth, a small amount of Secondary Air is sprayed through circumference air hose 13
Out；Since a dense wind snout is located at burner centre, light first nozzle is located in burner outermost circumferential direction, two strands of air-flows it
Between formed a fan annular return space, deep or light two strands of First air breeze airflows sector reflux cavity in distinguish adherent flowing,
There is very strong Involving velocity to air-flow in reflux cavity 6, generate biggish negative pressure, the volume of the hot fume in burner hearth can be inhaled,
It flows back into and two strands of breeze airflows heat in fan annular return cavity and its initial burning before spraying into burner hearth can be made, due to
3 spout end of thick coal culm primary air piping and 4 spout end of thin powdered coal primary air piping are after being axially respectively positioned on 5 spout end of secondary air channel
Side, does not mix also with Secondary Air at this time, can increase substantially the kindling in underload and burning low grade coal and surely fire ability；It is secondary
Wind snout is located at dense First air back-fire side at fan annular, the coal of the kindling of part gradually exported from back-fire side to reflux cavity 6
Powder air-flow gradually aftercombustion air does not hinder not only to guarantee steady combustion, Secondary Air and one in high temperature gases recirculating to reflux cavity 6
Secondary wind has biggish momentum together, solves the problems, such as that W flame boiler flame undershoot momentum is insufficient, plays raising burner outlet
Whole air-flow rigidity prevents the effects of boiler water wall coking, and the Secondary Air gradually sprayed into forms the grade separation of burner internal
Wind also helps reduction NOx emission；Breeze airflow kindling shifts to an earlier date and whole air-flow rigidity reinforced, extends breeze airflow in furnace
Burning time in thorax is conducive to improve efficiency of combustion；
4 entrance of thin powdered coal primary air piping is tapered taper, and the light primary air velocity after air-coal separating can be prevented relatively low,
Light First air air-flow is further increased to the reflux capability of high-temperature flue gas and prevents burner outlet coking ability；Under normal conditions
Valve 9 is in close state, to guarantee the normal work of burner；It can also be by the aperture of control valve 9 to fan annular return
Amount in cavity 6 as needed is passed through a small amount of Secondary Air or the combustion adjuvants such as inertia furnace cigarette or suitable pure oxygen, for adjusting in burner hearth
High temperature gases recirculating to reflux cavity amount size, temperature in adjustment reflux cavity 6 carries out the adjusting of ignition point, or suitable
For different coals quality, meets the needs of boiler for deeply peak regulation and burning low grade coal；Orifice plate 10 can guarantee Secondary Air or inertia furnace
The uniformity that cigarette or pure oxygen are sent into；
Several spouts 13 being spaced in the circumferential can realize that more thermal flue gas backs flow in reflux cavity；Bluff body 11 can fit
When the mixing for extending primary and secondary air；By being passed through suitable Secondary Air in circumference air hose 14, it can protect, cool down burner spray
Mouthful；The temperature in reflux cavity 6, and the size of 9 aperture of control valve are measured by thermocouple 12, it can be by different burning coals
Temperature is controlled in suitable range.
This burner may be designed to the different shapes such as round, rectangular, using welding or flange after the production of burner sectional
Connection group is integral；The thick coal culm one time partition between wind snout and overfire air port can be isolated with single layer heat-resisting steel sheet and plate or bilayer
Centre folder is empty to be thickeied.
Claims (9)
1. a kind of straight-through pulverized coal burner, the pulverized coal concentrator including shell, in shell, it is characterised in that further include and coal
Thick coal culm primary air piping that the thick coal culm outlet of powder inspissator is connected is around in thick coal culm primary air piping partially circumferentially outer thin powdered coal
Primary air piping, the secondary air channel being connected with shell, secondary air channel in circumferentially opposed setting and are around in dense with thin powdered coal primary air piping
Coal dust primary air piping rest part week, secondary air channel was located at the back-fire side of thick coal culm primary air piping, thick coal culm primary air piping outward
Spout end and thin powdered coal primary air piping spout end are arranged in spaced radial, form reflux cavity, thick coal culm First air therebetween
Pipe spout end and thin powdered coal primary air piping spout end are at the rear for being axially respectively positioned on secondary air channel spout end.
2. a kind of straight-through pulverized coal burner according to claim 1, it is characterised in that: the thin powdered coal primary air piping entrance
Section is tapered taper.
3. a kind of straight-through pulverized coal burner according to claim 1 or 2, it is characterised in that: the thin powdered coal primary air piping
Circumferentially around angle be greater than secondary air channel circumferentially around angle.
4. a kind of straight-through pulverized coal burner according to claim 3, it is characterised in that: set in the entrance of secondary air channel
There is air door.
5. a kind of straight-through pulverized coal burner according to claim 4, it is characterised in that: the thick coal culm primary air piping spout
The reflux cavity at end and thin powdered coal primary air piping spout end rear is connected with accessory channel, and valve is equipped in accessory channel, is returning
It flows and is equipped with orifice plate in cavity.
6. a kind of straight-through pulverized coal burner according to claim 5, it is characterised in that: the thin powdered coal primary air piping spout
End is equipped with several spouts being spaced in the circumferential.
7. a kind of straight-through pulverized coal burner according to claim 5, it is characterised in that: the secondary air channel spout is set in end
There is bluff body.
8. a kind of straight-through pulverized coal burner according to claim 6 or 7, it is characterised in that: described in thin powdered coal First air
The periphery for managing corresponding shell is provided with circumference air hose.
9. a kind of straight-through pulverized coal burner according to claim 8, it is characterised in that: be equipped with thermoelectricity in back cavity body
It is even.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822136869.5U CN209540875U (en) | 2018-12-19 | 2018-12-19 | A kind of straight-through pulverized coal burner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822136869.5U CN209540875U (en) | 2018-12-19 | 2018-12-19 | A kind of straight-through pulverized coal burner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209540875U true CN209540875U (en) | 2019-10-25 |
Family
ID=68264896
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822136869.5U Withdrawn - After Issue CN209540875U (en) | 2018-12-19 | 2018-12-19 | A kind of straight-through pulverized coal burner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209540875U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109708106A (en) * | 2018-12-19 | 2019-05-03 | 东方电气集团东方锅炉股份有限公司 | A kind of straight-through pulverized coal burner |
-
2018
- 2018-12-19 CN CN201822136869.5U patent/CN209540875U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109708106A (en) * | 2018-12-19 | 2019-05-03 | 东方电气集团东方锅炉股份有限公司 | A kind of straight-through pulverized coal burner |
| CN109708106B (en) * | 2018-12-19 | 2023-10-24 | 东方电气集团东方锅炉股份有限公司 | Direct-current pulverized coal burner |
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