CN206582836U - A kind of low nitrogen burning fluidized-bed combustion boiler - Google Patents
A kind of low nitrogen burning fluidized-bed combustion boiler Download PDFInfo
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- CN206582836U CN206582836U CN201621388675.9U CN201621388675U CN206582836U CN 206582836 U CN206582836 U CN 206582836U CN 201621388675 U CN201621388675 U CN 201621388675U CN 206582836 U CN206582836 U CN 206582836U
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Abstract
The utility model is related to a kind of low nitrogen burning fluidized-bed combustion boiler.The utility model is according to NO_x formation principle, by coupling space stage gas and flue gas recycled grading combustion technology, the three-level combustion zone of strong reducing property, week reduction, oxidisability is formed in furnace height direction, significantly slow burner hearth emulsion zone combustion intensity simultaneously, control burner hearth emulsion zone ignition temperature, burner hearth bulk temperature distributing homogeneity is improved, suppresses temperature mode nitrogen oxidation and produces；Fuel NO generation is substantially reduced simultaneously, and can be nitrogen originally by the nitrogen oxides generated.
Description
Technical field
The utility model belongs to fluidized bed combustion field, is related to a kind of low nitrogen burning fluidized-bed combustion boiler.
Background technology
Fluidized bed combustion is the boiler New combustion technique risen in the late two decades, and wide, efficiency of combustion is adapted to fuel
High, load variations scope is big, and the relatively low advantage of discharged nitrous oxides is main force's type of furnace of current clean coal combustion technology,
It is widely used in coal-fired industry and thermoelectricity field.But as environmental pressure is increasingly serious, country is to environmental emission standard
It is required that it is stricter, in December, 2,015 three ministries and commissions of State Council issue《Implement in full coal-burning power plant's minimum discharge and reducing energy consumption
Programme of work》Regulation, the coal-burning power plant that the whole nation possesses transformation condition need to realize minimum discharge before the year two thousand twenty, and eastern region need to be
Completed before 2017, minimum discharge is distinctly claimed the mg/Nm of discharged nitrous oxides concentration NOx in flue gas≤503（O2=
6%）.However, fluidized-bed combustion boiler nitrogen oxides is originally generated concentration, although than other type of furnaces more relatively low, but furnace outlet is dense
Degree is still 200mg/Nm3-300 mg/Nm3, Earlier designs manufacture fluidized-bed combustion boiler be even as high as 400mg/Nm3, significantly larger than
Minimum discharge required concentration of emission reached in providing.Therefore, if existing coal-burning boiler does not take any measure, basic nothing
Method meets current environmental requirement.How under the premise of boiler combustion efficiency is ensured, discharged nitrous oxides concentration is greatly lowered, it is full
Sufficient coal-burning boiler minimum discharge requirement, to realizing that minimum discharge has important practical significance with target for energy-saving and emission-reduction.
The control method of nitrogen oxides from coal-fired boiler mainly has control in combustion process to be controlled with flue gas after burning.It is burned
Controlled in journey it is main by air classification, fuel staging, air-coal separating or（With）The low-NO_x combustion technologies such as flue gas recirculation are to combustion
Burner or combustion zone are improved, and are formed reducing atmosphere and are suppressed nitrogen oxides generation, out of stock relatively inefficient, but with equipment body
Product small, initial investment it is few, substantially without operating cost the advantages of；Flue gas is controlled after burning, i.e., sprayed into also in boiler emission flue gas
The nitrogen oxides reducing/oxidizing generated is turned into N by former agent/oxidant2.At present, the out of stock control of flue gas it is main with SNCR with
The out of stock technologies of SCR are most representative, with of a relatively high denitration efficiency, are particularly adapted to large-scale coal-fired power station boiler, but deposit
It is that equipment volume is big, initial investment is big, operating cost is high, and longtime running causes secondary pollution caused by the escaping of ammonia and shadow
The problems such as rattle portion flue surface.Meanwhile, environment protection emission index request is increasingly strict（As provided in present GB 13223-2011
NOx ≤ 100 mg/Nm3, the mg/Nm of regulation NOx in the minimum discharge that will implement≤503, O2= 6%）, due to any de-
Pin method is all that, with optimal out of stock efficiency, although existing coal-burning boiler meets existing discharge index, but usually requires again
Transformation, could meet new discharge standard；Although the out of stock out of stock efficiency of control of flue gas is higher, even if disclosure satisfy that current standard,
But due to coal-burning boiler, to be initially generated concentration higher, higher than its optimal out of stock efficiency, it is difficult to directly meet new minimum discharge mark
It is accurate, it usually needs the other out of stock measures of joint.
To meet minimum discharge standard, out of stock technology is combined using the out of stock mode of low nitrogen burning and flue gas, people is caused
Extensive concern.When combining out of stock, low-NO_x combustion technology in addition to above-mentioned advantage, also with cost is low, short construction period, to flue gas
Out of stock systematic influence is small, the out of stock pressure of reducing smoke, the advantages of reducing flue gas sold out operation cost.But so far, relevant stream
Fluidized bed boiler is relatively fewer using the research report of low-NO_x combustion technology, although most of fluidized-bed combustion boiler, particularly recycle stream
Fluidized bed boiler employs relatively simple air classification technology, but early stage is paid little attention to environmental protection, is manufacturing and designing fluid bed
During boiler, fluidized bed material laminarization characteristic is only focused on, focuses on boiler combustion efficiency, boiler thermal output, or even excess load fortune is pursued
The traditional design theories such as row, cause the First air air distribution of actual motion than bigger than normal, air classification DeGrain, cause classification to be fired
Burn effect relatively low.Therefore, the Researched of Air Staging Combustion Burning Pulverized Coal of fluidized-bed combustion boiler reproducibility region point in air classification proportioning, combustion zone
There is larger improvement space in terms of cloth, Secondary Air incidence characteristic and Entraining Effect.Therefore, the utility model is based on coupling
Air classification and flue gas recycled fractional combustion Design Conception, build a kind of fluid bed low-NO_x burner.
The content of the invention
The utility model main purpose is that reduction fluid-bed combustion boiler nitrogen oxides is originally generated concentration there is provided a kind of base
In air the fluid bed low-NO_x burner coupled is classified with flue gas recycled.
The utility model include primary air fan, overfire air fan, air compartment, burner hearth, cyclone separator, back-end surfaces flue,
Deduster, air-introduced machine, chimney, recirculation blower；The burner hearth hypomere is that variable cross-section emulsion zone, middle epimere are uiform section dilute phase
Area；Superheater, economizer, First air air preheater and secondary air are provided with the back-end surfaces flue from top to bottom
Preheater；It is characterized in that：Primary air fan outlet connects the air compartment left and right sides by primary air piping through First air air preheater
The primary air nozzle entrance being provided with, overfire air fan outlet is by secondary air channel connecting secondary wind air preheater entrance, and Secondary Air is empty
The secondary air channel of air preheater outlet connection is divided into upper and lower secondary air channel, and upper and lower secondary air channel connects upper and lower Secondary Air respectively
Tank inlet；The upper and lower Secondary Air that upper and lower secondary air box outlet is provided with variable cross-section emulsion zone respectively through upper and lower Secondary Air branch pipe
Entrance is connected, and forms classifired combustion；Air-introduced machine is exported is provided with flue gas recycled pipeline between chimney, in recycling cigarette
Feed channel is provided with recirculation blower, and recirculation blower outlet is provided with flue gas recycled stepped pipeline in parallel, respectively with First air
Machine entrance, the connection of lower secondary air box arrival end, form flue gas recycled classification, and recirculation blower controls to adjust amount of flue gas emission, then
Circulating flue gas stepped pipeline is respectively equipped with regulation each stepped pipeline exhaust gas volumn of valve regulation；The flue gas recycled stepped pipeline conveying
Two grades of flue gas recycleds mixed with the lower Secondary Air of lower Secondary Air pipeline in lower secondary air box arrival end, it is secondary under increase
Wind bellows static pressure, improves lower secondary air stiffness and penetrability.
Furtherly, the upper Secondary Air entrance that the variable cross-section emulsion zone is provided with is arranged at upper end in emulsion zone, each upper two
Secondary wind entrance is in same absolute altitude；The lower Secondary Air entrance that variable cross-section emulsion zone is provided with is arranged at lower end in emulsion zone, each time two
Secondary wind entrance is in same absolute altitude.
Furtherly, the upper Secondary Air inlet axis incident direction tilts down 0 degree -20 relative to horizontal direction
Degree, each incident wind speed of upper Secondary Air entrance should be controlled in 40m/s -80m/s；Secondary inlet axis incident direction is relative under described
10 degree of -35 degree is tilted down in horizontal direction, each incident wind speed of lower Secondary Air entrance should be controlled in 60m/s -120m/s.
Furtherly, the flue gas recycled pipeline that is provided between the fan outlet and chimney, recirculation blower and simultaneously
Join flue gas recycled stepped pipeline and be provided with anti-corrosion and heat-insulation layer.
The utility model has the advantages that the utility model is according to NO_x formation principle, by couple space stage gas with again
Circulating flue gas grading combustion technology, the three-level combustion zone of strong reducing property, week reduction, oxidisability is formed in furnace height direction,
Burner hearth emulsion zone combustion intensity is significantly slowed simultaneously, burner hearth emulsion zone ignition temperature is controlled, and improves the distribution of burner hearth bulk temperature equal
Even property, suppresses temperature mode nitrogen oxidation and produces；Fuel NO generation is substantially reduced simultaneously, and can be by the nitrogen oxidation generated
Thing was nitrogen originally；Flue gas recycled is sent directly into by air compartment and secondary air box by recirculation blower, primary and secondary air can be reduced
Electromechanics consumption, it is to avoid corrosion of the flue gas recycled to fan blade, air preheater heat exchanger tube internal face；Avoid after long-play
Air quantity device for pressure measurement in erosion of the dust granules to draught fan impeller in flue gas recycled, and first and second airduct of obstruction；This
Utility model also has simple in construction, and easy to operate, the rebuilding construction cycle is short, and cost is relatively low, the advantages of floor space is smaller, special
It is not adapted to the transformation of early stage fluidized-bed combustion boiler low nitrogen burning.
Brief description of the drawings
Fig. 1 is the utility model structural representation.
Embodiment
1 pair of the utility model elaborates below in conjunction with the accompanying drawings.
As shown in figure 1, the utility model device includes primary air fan 17, overfire air fan 18, air compartment 1, burner hearth 3, whirlwind point
From device 5, back-end surfaces flue 11, deduster 20, air-introduced machine 22, chimney 21, recirculation blower 24.The burner hearth hypomere is change
Section emulsion zone 2, middle epimere are uiform section dilute-phase zone 4；From top to bottom provided with superheater 10, province in the back-end surfaces flue
Coal device 12, air preheater 13（Primary and secondary air）.
Primary air fan outlet is by primary air piping 15 through air preheater（First air）The connection air compartment left and right sides is provided with
Primary air nozzle entrance, overfire air fan entrance 19 connects air preheater by corresponding outlet through secondary air channel 14（Secondary Air）Enter
Mouthful, air preheater（Secondary Air）The secondary air channel 14 of outlet connection is divided into upper and lower secondary air channel, upper and lower secondary air channel difference
The entrance of secondary air box 6, the entrance of lower secondary air box 7 in connection, the outlet of upper and lower secondary air box through upper and lower Secondary Air branch pipe respectively with
The upper and lower Secondary Air entrance that variable cross-section emulsion zone is provided with is connected, and forms classifired combustion；The air-introduced machine 22 outlet with
Flue gas recycled pipeline 23 is provided between chimney, recirculation blower 24, recirculation blower outlet are provided with flue gas recycled pipeline
Provided with flue gas recycled stepped pipeline 8,9 in parallel, connected respectively with primary air fan entrance 16, lower secondary air box arrival end,
Flue gas recycled classification is formed, recirculation blower controls to adjust amount of flue gas emission, and flue gas recycled stepped pipeline is respectively equipped with regulation
Each stepped pipeline exhaust gas volumn of valve regulation.
The upper Secondary Air entrance that variable cross-section emulsion zone is provided with is arranged at upper end in emulsion zone, and each upper Secondary Air entrance is in same
One absolute altitude；The lower Secondary Air entrance that variable cross-section emulsion zone is provided with is arranged at lower end in emulsion zone, and each lower Secondary Air entrance is in same
One absolute altitude.
Upper Secondary Air inlet axis incident direction tilts down 0 degree of -20 degree relative to horizontal direction, and each upper Secondary Air enters
The incident wind speed of mouth should be controlled in 40m/s -80m/s；When upper Secondary Air incident direction inclination angle is 0 degree, two can be fully demonstrated
Secondary wind air classification effect, and can emulsion zone granule density formation depressor effect, prevent a large amount of burning particles are carried to dilute
Phase region.When upper Secondary Air is 80m/s, while the penetrability of Secondary Air and rigidity is ensured, if can cause too in increase
Emulsion zone granule density, it is very few to cause to be carried to dilute-phase zone particle concentration, causes burner hearth upper and lower temperature difference excessive, causes with motionless
Burning load.Secondary inlet axis incident direction tilts down 10 degree of -35 degree relative to horizontal direction under described, it is each under it is secondary
Wind entrance incidence wind speed should be controlled in 60m/s -120m/s；Lower Secondary Air incident direction is to tilt down as 10 degree, Neng Gouti
Now secondary air grading effect, such as inclination angle reduces, emulsion zone bottom oxygen amount can be caused to supplement in time, easily caused again
Bottom anoxic, or local coking phenomenon；When lower Secondary Air inclination angle is smaller, Secondary Air incidence wind speed can bring up to 120m/s, have
There are enough rigidity and penetrability, if wind speed is further added by, can cause that lower secondary air box wind is excessive greatly, overfire air fan power consumption is excessive.
Flue gas recycled pipeline, recirculation blower and the flue gas recycled in parallel being provided between fan outlet and chimney
Stepped pipeline is provided with anti-corrosion and heat-insulation layer.
Primary air flow, secondary air flow, flue gas recycled amount is adjustable, and First air ratio, Secondary Air ratio, flue gas recycled ratio can
Control is in the range of 25%-60%, 40%-75%, 10%-40%；Upper and lower Secondary Air than allotment according to boiler load increase, under it is secondary
Wind is carried out than reduction, upper Secondary Air than increase principle.I and II flue gas recycled ratio is distinguished according to boiler load with coal type change
Control is in the range of 60%-100%, 0%-40%.Based on above-mentioned air and flue gas recycled fractional combustion is coupled, in the close phase of variable cross-section
Excess air coefficient about 0.6-0.8 strong reducing property atmosphere, the emulsion zone mistake between upper and lower Secondary Air entrance are formed on area bottom
Measure air coefficient about 0.8-1.0 weak reducing atmosphere, upper Secondary Air entrance with upper furnace zone forming amount air coefficient about
1.1-1.3 oxidisability combustion zone.Such as allocated by flue gas recycled, when First air ratio is reduced into 25%（Account for total blast volume）, one
Level flue gas recycled amount should account for more than 80%, while ensureing that bed is fully fluidized, in the burner hearth bottom formation close phase of strong reducing property
The strong reducing property atmosphere that area, i.e. excess air coefficient are about 0.6-0.8, if First air is reduced than again, can cause emulsion zone bottom
Portion's severe depletion of oxygen, can cause pulverized coal particle to liquefy, and not be direct burning, pulverized coal particle coking phenomenon, reduction fluidisation easily occur
Bed combustion stability.
After ignition of the boiler is normally run, recirculation blower is opened, according to the boiler load, the lower burning temperature of burner hearth boiling
Degree, oxygen at furnace exit and NOx concentration height, convey flue gas recycled, while reducing primary air flow, increase secondary air flow, lead to
Recirculation blower regulation and control flue gas recycled total amount is crossed, the control and regulation valve being provided with using recycling stepped pipeline is adjusted respectively
I and II flue gas recycled amount is matched；One-level flue gas recycled conveys the First air preheated through air preheater in wind with primary air fan
Enter burner hearth fluidized bed material after indoor uniform mixing, low oxygen combustion is carried out in burner hearth bottom emulsion zone, reduction emulsion zone boiling is left the bed
Temperature, suppresses temperature mode NO_x formation, while generating a large amount of reducibility gas CO, forms strong reducing property atmosphere area, suppresses combustion
Material type NO_x formation；Two grades of flue gas recycleds convey secondary under the lower Secondary Air warp preheated through empty preheater with overfire air fan
After mixing, burner hearth emulsion zone middle and lower part uniformly is injected by lower Secondary Air inlet at high for bellows, is produced and is inhaled volume effect, enhancing strongly
Oxygen amount in flow disturbance in the region, aftercombustion emulsion zone, forms weak reducing atmosphere area, further suppresses nitrogen oxidation
Thing is generated, while will generation nitrogen oxides reduction；The upper Secondary Air that overfire air fan conveying is preheated through empty preheater passes through upper secondary
Burner hearth emulsion zone middle and upper part is injected at a high speed in air port, produces Entraining Effect, and enhancing disturbance forms the burning-out zone of oxidizing atmosphere；According to
Coupled according to the air with flue gas recycled two-stage, burner hearth is divided into the strong reducing property combustion zone of emulsion zone bottom, emulsion zone
The week reduction combustion zone on top and the three-level combustion process of dilute-phase zone oxidisability burning-out zone, can significantly inhibit nitrogen oxides
Generation, prevents the secondary generation of nitrogen oxides, advantageously reduces the lower temperature difference between furnace outlet of burner hearth boiling, improves boiler load and become
Change scope.
The utility model is combined by air classification with flue gas recycled grading combustion technology, in burner hearth along short transverse
Obvious strong reducing property burning, week reduction burning, oxidisability after-flame three-level combustion zone are formed, fuel NO is reduced
Formed, while significantly slowing burner hearth emulsion zone combustion intensity, control burner hearth emulsion zone ignition temperature, improve burner hearth bulk temperature point
Cloth uniformity, suppresses temperature mode nitrogen oxidation and produces.Flue gas recycled is sent directly into air compartment and Secondary Air using recirculation blower
Case, reduction primary and secondary air electromechanics consumption, it is to avoid corrosion of the flue gas to fan blade, air preheater heat exchanger tube internal face；Avoid length
Erosion of the dust granules to draught fan impeller in flue gas after time operation, and air quantity manometer measurement apparatus is blocked.This reality
With it is new also have it is simple in construction, easy to operate, the rebuilding construction cycle is short, and cost is relatively low, the advantages of floor space is smaller, especially
It is adapted to the transformation of early stage fluidized-bed combustion boiler low nitrogen burning.
By using the utility model device and low nitrogen burning method, following effect can reach：Boiler load 40%-110%
Between when changing, oxygen at furnace exit can be controlled in 2%-5%, nitrogen oxides can be controlled to be originally generated concentration simultaneously, it is ensured that pot
Stove efficiency of combustion, boiler thermal output influence is smaller；Boiler nitrous oxides concentration is originally generated concentration ratio transformation preceding more than 50%.
The utility model is applied to coal-fired fluidized bed boiler.Preferable case study on implementation of the present utility model is the foregoing is only,
All equivalent changes and modifications made according to present utility model application scope, should all belong to the covering scope of the utility model patent.
Claims (4)
1. a kind of low nitrogen burning fluidized-bed combustion boiler, including primary air fan, overfire air fan, air compartment, burner hearth, cyclone separator, afterbody
Heating surface flue, deduster, air-introduced machine, chimney, recirculation blower；The burner hearth hypomere is that variable cross-section emulsion zone, middle epimere are
Uiform section dilute-phase zone；In the back-end surfaces flue from top to bottom provided with superheater, economizer, First air air preheater and
Air preheater of secondary air；It is characterized in that：Primary air fan outlet connects wind by primary air piping through First air air preheater
The primary air nozzle entrance that the room left and right sides is provided with, overfire air fan outlet is entered by secondary air channel connecting secondary wind air preheater
Mouthful, the secondary air channel of air preheater of secondary air outlet connection is divided into upper and lower secondary air channel, and upper and lower secondary air channel is connected respectively
Upper and lower secondary air box entrance；What upper and lower secondary air box outlet was provided with variable cross-section emulsion zone respectively through upper and lower Secondary Air branch pipe
Upper and lower Secondary Air entrance is connected, and forms classifired combustion；Air-introduced machine is exported is provided with flue gas recycled pipe between chimney
Road, is provided with recirculation blower on flue gas recycled pipeline, and recirculation blower outlet is provided with flue gas recycled stepped pipeline in parallel,
It is connected respectively with primary air fan entrance, lower secondary air box arrival end, forms flue gas recycled classification, recirculation blower is controlled to adjust
Amount of flue gas emission, flue gas recycled stepped pipeline is respectively equipped with regulation each stepped pipeline exhaust gas volumn of valve regulation；The flue gas recycled
Two grades of flue gas recycleds of stepped pipeline conveying are mixed in lower secondary air box arrival end with the lower Secondary Air of lower Secondary Air pipeline
Close, the lower secondary air bellow static pressure of increase improves lower secondary air stiffness and penetrability.
2. a kind of low nitrogen burning fluidized-bed combustion boiler according to claim 1, it is characterised in that：The variable cross-section emulsion zone is set
The upper Secondary Air entrance having is arranged at upper end in emulsion zone, and each upper Secondary Air entrance is in same absolute altitude；Variable cross-section emulsion zone is set
The lower Secondary Air entrance having is arranged at lower end in emulsion zone, and each lower Secondary Air entrance is in same absolute altitude.
3. a kind of low nitrogen burning fluidized-bed combustion boiler according to claim 2, it is characterised in that：The upper Secondary Air inlet shaft
Line incident direction tilts down 0 degree of -20 degree relative to horizontal direction, and each incident wind speed of upper Secondary Air entrance should be controlled in 40m/
s - 80m/s；Secondary inlet axis incident direction tilts down 10 degree of -35 degree, each time two relative to horizontal direction under described
The incident wind speed of secondary wind entrance should be controlled in 60m/s -120m/s.
4. a kind of low nitrogen burning fluidized-bed combustion boiler according to claim 1, it is characterised in that：The fan outlet and chimney
Between the flue gas recycled pipeline, recirculation blower and the flue gas recycled stepped pipeline in parallel that are provided with provided with anti-corrosion and insulation
Layer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201621388675.9U CN206582836U (en) | 2016-12-18 | 2016-12-18 | A kind of low nitrogen burning fluidized-bed combustion boiler |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201621388675.9U CN206582836U (en) | 2016-12-18 | 2016-12-18 | A kind of low nitrogen burning fluidized-bed combustion boiler |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106642090A (en) * | 2016-12-18 | 2017-05-10 | 北京国能中电节能环保技术股份有限公司 | Low-nitrogen combustion device for fluidized bed boiler |
| CN108050850A (en) * | 2017-11-02 | 2018-05-18 | 武汉东晟捷能科技有限公司 | A kind of yellow phosphoric tail gas boiler flue gas purification system and purification method |
-
2016
- 2016-12-18 CN CN201621388675.9U patent/CN206582836U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106642090A (en) * | 2016-12-18 | 2017-05-10 | 北京国能中电节能环保技术股份有限公司 | Low-nitrogen combustion device for fluidized bed boiler |
| CN106642090B (en) * | 2016-12-18 | 2019-05-03 | 北京国能中电节能环保技术股份有限公司 | Fluidized-bed combustion boiler low nitrogen combustion apparatus |
| CN108050850A (en) * | 2017-11-02 | 2018-05-18 | 武汉东晟捷能科技有限公司 | A kind of yellow phosphoric tail gas boiler flue gas purification system and purification method |
| CN108050850B (en) * | 2017-11-02 | 2020-06-02 | 武汉东晟捷能科技有限公司 | Yellow phosphorus tail gas boiler flue gas purification system and purification method |
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